Note 19 - Parent Company Financial Statements (Detail) - Condensed Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income	$ 12,149	$ 2,738	$ 6,932
Adjustments to reconcile net income to net cash provided by operating activities:
Noncash employee stock purchase plan expense	36	42	46
Deferred income tax (benefit) expense	(1,043)	(2,227)	(3,392)
Net cash provided by operating activities	28,410	28,062	28,140
Cash Flows From Investing Activities
Proceeds from liquidation of company-owned life insurance		(2,248)	(8,567)
Net cash (used in) provided by investing activities	63,174	(53,006)	172,050
Cash Flows From Financing Activities
Dividends paid, common and preferred stock	(1,500)	(1,500)	(2,237)
Repurchase of common stock warrant	(75)
Shares issued under Employee Stock Purchase Plan	(128)	(136)	(157)
Net cash used in financing activities	(90,038)	(62,803)	(236,470)
Net increase in cash and cash equivalents	1,546	(87,747)	(36,280)
Cash and cash equivalents at beginning of year	94,309	182,056	218,336
Cash and cash equivalents at end of year	95,855	94,309	182,056
Nonbank Subsidiaries [Member] | Parent Company [Member]
Cash Flows From Investing Activities
Investment in subsidiaries			(800)
Bank Subsidiaries [Member] | Parent Company [Member]
Cash Flows From Investing Activities
Investment in subsidiaries	(2,500)	(4,000)	(3,350)
Parent Company [Member]
Net income	12,149	2,738	6,932
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed (income) loss of subsidiaries	(1,637)	500	(2,793)
Noncash employee stock purchase plan expense	3	3	2
Change in other assets and liabilities, net	(590)	1,253	1,917
Deferred income tax (benefit) expense	(64)	735	(850)
Net cash provided by operating activities	9,861	5,229	5,208
Cash Flows From Investing Activities
Return of equity from nonbank subsidiary	500		1,150
Proceeds from liquidation of company-owned life insurance		2,248	8,567
Net cash (used in) provided by investing activities	(2,000)	(1,752)	5,567
Cash Flows From Financing Activities
Dividends paid, common and preferred stock	(1,500)	(1,500)	(2,237)
Repurchase of common stock warrant	(75)
Shares issued under Employee Stock Purchase Plan	128	136	157
Net cash used in financing activities	(1,447)	(1,364)	(2,080)
Net increase in cash and cash equivalents	6,414	2,113	8,695
Cash and cash equivalents at beginning of year	18,362	16,249	7,554
Cash and cash equivalents at end of year	$ 24,776	$ 18,362	$ 16,249