Note 4 - Loans and Allowance for Credit Losses (Details) - Allowance for Credit Losses (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Allowance for loan losses:
Balance at Beginning of Period	$ 30,354	$ 31,883	$ 30,234	$ 32,597
Additions:
Provision	1,800	2,800	4,600	5,600
Deductions:
Chargeoffs	(2,126)	(4,241)	(5,895)	(8,939)
Recoveries	898	1,081	1,987	2,265
Net Loan Losses	(1,228)	(3,160)	(3,908)	(6,674)
Balance at End of Period	30,926	31,523	30,926	31,523
Liability for Off-Balance Sheet Credit Exposure	2,693	2,693	2,693	2,693
Total Allowance for Credit Losses	33,619	34,216	33,619	34,216	32,927
Commercial [Member]
Allowance for loan losses:
Balance at Beginning of Period	5,536	6,814	6,445	6,012
Additions:
Provision	(1,301)	1,984	(770)	3,259
Deductions:
Chargeoffs	(148)	(2,696)	(2,050)	(3,558)
Recoveries	297	228	759	617
Net Loan Losses	149	(2,468)	(1,291)	(2,941)
Balance at End of Period	4,384	6,330	4,384	6,330
Liability for Off-Balance Sheet Credit Exposure	1,698	1,644	1,698	1,644
Total Allowance for Credit Losses	6,082	7,974	6,082	7,974	8,179
Commercial Real Estate Loans [Member]
Allowance for loan losses:
Balance at Beginning of Period	10,965	11,427	10,063	10,611
Additions:
Provision	660	(1,561)	1,653	203
Deductions:
Chargeoffs	(427)		(539)	(948)
Recoveries	77	33	98	33
Net Loan Losses	(350)	33	(441)	(915)
Balance at End of Period	11,275	9,899	11,275	9,899
Liability for Off-Balance Sheet Credit Exposure	1	16	1	16
Total Allowance for Credit Losses	11,276	9,915	11,276	9,915	10,072
Construction [Member]
Allowance for loan losses:
Balance at Beginning of Period	480	2,755	484	2,342
Additions:
Provision	(2)	(270)	(6)	141
Deductions:
Recoveries		196		198
Net Loan Losses		196		198
Balance at End of Period	478	2,681	478	2,681
Liability for Off-Balance Sheet Credit Exposure	127	12	127	12
Total Allowance for Credit Losses	605	2,693	605	2,693	484
Residential Real Estate Loans [Member]
Allowance for loan losses:
Balance at Beginning of Period	539	645	380	781
Additions:
Provision	15	19	261	753
Deductions:
Chargeoffs	(22)	(62)	(109)	(932)
Net Loan Losses	(22)	(62)	(109)	(932)
Balance at End of Period	532	602	532	602
Total Allowance for Credit Losses	532	602	532	602	380
Consumer Installment And Other [Member]
Allowance for loan losses:
Balance at Beginning of Period	2,768	2,825	3,194	3,072
Additions:
Provision	225	817	507	1,444
Deductions:
Chargeoffs	(896)	(1,211)	(2,205)	(2,864)
Recoveries	506	600	1,107	1,379
Net Loan Losses	(390)	(611)	(1,098)	(1,485)
Balance at End of Period	2,603	3,031	2,603	3,031
Liability for Off-Balance Sheet Credit Exposure	473	384	473	384
Total Allowance for Credit Losses	3,076	3,415	3,076	3,415	3,613
Purchased Non-Covered Loans [Member]
Additions:
Provision	116	25	116	25
Deductions:
Chargeoffs	(116)	(25)	(116)	(25)
Net Loan Losses	(116)	(25)	(116)	(25)
Purchased Covered Loans [Member]
Allowance for loan losses:
Balance at Beginning of Period	738	139	1,005
Additions:
Provision	46	324	133	814
Deductions:
Chargeoffs	(517)	(247)	(876)	(612)
Recoveries	18	24	23	38
Net Loan Losses	(499)	(223)	(853)	(574)
Balance at End of Period	285	240	285	240
Total Allowance for Credit Losses	285	240	285	240	1,005
Unallocated Financing Receivable [Member]
Allowance for loan losses:
Balance at Beginning of Period	9,328	7,278	8,663	9,779
Additions:
Provision	2,041	1,462	2,706	(1,039)
Deductions:
Balance at End of Period	11,369	8,740	11,369	8,740
Liability for Off-Balance Sheet Credit Exposure	394	637	394	637
Total Allowance for Credit Losses	$ 11,763	$ 9,377	$ 11,763	$ 9,377	$ 9,194