Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Principles of Consolidation and Recent Events (Details)

v3.21.2
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Principles of Consolidation and Recent Events (Details)
 9 Months Ended 12 Months Ended
Jul. 07, 2021
USD ($)
Sep. 30, 2021
USD ($)
Loan
Branch
Dec. 31, 2020
USD ($)
Loan
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]      
Number of full service branch offices | Branch   26  
Recent Events [Abstract]      
Aggregate number of loan modifications made by other than troubled debt restructurings | Loan   726  
Aggregate amount of loan modifications made by other than troubled debt restructurings, aggregate principal balances   $ 337,200,000  
Interest-Only Modifications [Member]      
Recent Events [Abstract]      
Aggregate number of loan modifications made by other than troubled debt restructurings | Loan   726  
Aggregate amount of loan modifications made by other than troubled debt restructurings, aggregate principal balances   $ 337,200,000  
PPP Loans [Member]      
Recent Events [Abstract]      
Number of loans originated | Loan   1,000 1,738
Loans originated   $ 128,100,000 $ 346,700,000
Average size of loans originated     200,000
Fees generated for loans originated   $ 5,600,000 $ 10,000,000.0
Number of loans forgiven | Loan   1,742 765
Loans forgiven   $ 279,900,000 $ 113,500,000
Fees recognized for loans forgiven   $ 7,100,000 $ 5,400,000
PPP Loans [Member] | Minimum [Member]      
Recent Events [Abstract]      
Contractual period   24 months  
PPP Loans [Member] | Maximum [Member]      
Recent Events [Abstract]      
Contractual period   60 months  
Macatawa Statutory Trust II [Member] | Common Securities [Member]      
Recent Events [Abstract]      
Common securities repurchased $ 619,000    
Trusted Preferred Securities [Member] | Macatawa Statutory Trust II [Member]      
Recent Events [Abstract]      
Trust securities redeemed $ 20,000,000.0