Macatawa Bank Corporation Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND OFF BALANCE-SHEET RISK (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Summary of the contractual amounts of financial instruments with off-balance-sheet risk [Abstract]
Notional amount of commitments to fund mortgage loans to be sold into the secondary market	$ 5,800	$ 19,800
Commitments to make loans at fixed rates	37.50%
Expiration period of commitment to make variable rate loan	30 days
Commitments to Make Loans [Member]
Summary of the contractual amounts of financial instruments with off-balance-sheet risk [Abstract]
Contractual amounts of financial instruments with off-balance-sheet risk	$ 111,681	90,293
Letters of Credit [Member]
Summary of the contractual amounts of financial instruments with off-balance-sheet risk [Abstract]
Contractual amounts of financial instruments with off-balance-sheet risk	11,317	13,823
Unused Lines of Credit [Member]
Summary of the contractual amounts of financial instruments with off-balance-sheet risk [Abstract]
Contractual amounts of financial instruments with off-balance-sheet risk	$ 457,485	$ 437,435