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

COMMITMENTS AND OFF-BALANCE-SHEET RISK (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
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	$ 26,900,000	$ 13,200,000
Commitments to make loans at fixed rates (in hundredths)	44.00%
Commitments to make loans at variable rates (in hundredths)	56.00%
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	75,319,000	60,890,000
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	8,200,000	3,245,000
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	$ 276,620,000	$ 230,674,000