Macatawa Bank Corporation Quarterly report pursuant to Section 13 or 15(d)

COMMITMENTS AND OFF BALANCE-SHEET RISK (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
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	$ 25,800,000	$ 26,900,000
Commitments to make loans at fixed rates (in hundredths)	30.00%
Commitments to make loans at variable rates (in hundredths)	0.00%
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	56,632,000	75,319,000
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	8,002,000	8,200,000
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	$ 274,629,000	$ 276,620,000