Note 25 - Firstbank Corporation (Parent Company Only) Condensed Financial Information (Details) - Condensed Balance Sheet (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 74,654,000	$ 99,601,000	$ 75,816,000	$ 73,538,000
Securities	343,602,000	353,678,000
Other assets	21,575,000	26,182,000
Total Assets	1,479,725,000	1,498,762,000
LIABILITIES AND EQUITY
Subordinated Debentures	36,084,000	36,084,000
Shareholders’ equity	137,626,000	147,058,000	155,377,000	148,428,000
Total Liabilities and Shareholders’ Equity	1,479,725,000	1,498,762,000
Parent Company [Member]
ASSETS
Cash and cash equivalents	12,556,000	11,167,000
Investment in and advances to banking subsidiaries	159,008,000	168,883,000
Securities	1,102,000	1,090,000
Other assets	2,372,000	4,327,000
Total Assets	175,038,000	185,467,000
LIABILITIES AND EQUITY
Accrued expenses and other liabilities	1,328,000	2,325,000
Subordinated Debentures	36,084,000	36,084,000
Total Liabilities and Shareholders’ Equity	$ 175,038,000	$ 185,467,000