Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)

v3.21.2
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
 6 Months Ended 12 Months Ended
Jul. 07, 2021
USD ($)
Jun. 30, 2021
USD ($)
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   $ 128,400,000 $ 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   833 765
Loans forgiven   $ 187,500,000 $ 113,500,000
Fees recognized for loans forgiven   $ 4,400,000 $ 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] | Subsequent Event [Member]      
Recent Events [Abstract]      
Common securities repurchased $ 619,000    
Trusted Preferred Securities [Member] | Macatawa Statutory Trust II [Member] | Subsequent Event [Member]      
Recent Events [Abstract]      
Trust securities redeemed $ 20,000,000.0