Note 14 - Income Taxes (Detail) - Deferred Tax Assets And Liabilities (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Alternative minimum tax (“AMT”) and other credit carryforwards	$ 12,798,000	$ 8,185,000
Federal net operating loss (“NOL”) carryforwards	16,962,000	7,299,000	100,000	100,000
Allowance for credit losses	42,687,000	50,775,000
Unrealized losses	22,940,000	24,610,000
OREO	5,376,000	8,490,000
State NOL carryforwards	11,456,000	11,776,000
Other state tax benefits	8,150,000	8,221,000
Other	10,783,000	10,191,000
Total deferred tax assets	131,152,000	129,547,000
Deferred tax liabilities:
Purchase accounting adjustments and intangibles	(10,278,000)	(12,569,000)
Deferred loan fees	(3,215,000)	(3,441,000)
Accrued retirement benefits	(6,681,000)	(2,354,000)
Depreciation	(2,843,000)	(2,063,000)
Cancellation of indebtedness income	(5,340,000)	(5,340,000)
Other	(9,365,000)	(8,160,000)
Total deferred tax liabilities	(37,722,000)	(33,927,000)
Deferred tax valuation allowance		(30,000)
Net deferred tax assets	93,430,000	95,590,000
Tax effect of adjustments related to other comprehensive income (loss)	9,194,000	17,763,000
Net deferred tax assets including adjustments	102,624,000	113,353,000
Net operating loss carryforwards available to offset future taxable income:
Other credits (1)	12,798,000	8,185,000
Internal Revenue Service (IRS) [Member]
Net operating loss carryforwards available to offset future taxable income:
Gross NOL Carryforwards	48,463,000	20,856,000
Illinois [Member]
Net operating loss carryforwards available to offset future taxable income:
Gross NOL Carryforwards	220,101,000	225,027,000
Indiana [Member]
Net operating loss carryforwards available to offset future taxable income:
Gross NOL Carryforwards	23,872,000	19,872,000
Wisconsin [Member]
Net operating loss carryforwards available to offset future taxable income:
Gross NOL Carryforwards	$ 229,000