Note 4 - Loans and Allowance for Credit Losses (Details) - Allowance for Credit Losses (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Allowance for loan losses:
Balance at Beginning of Period	$ 31,693	$ 30,234
Additions:
Provision	1,000	2,800
Deductions:
Chargeoffs	(1,319)	(3,769)
Recoveries	735	1,089
Net Loan Losses	(584)	(2,680)
Balance at End of Period	32,109	30,354
Liability for Off-Balance Sheet Credit Exposure	2,693	2,693
Total Allowance for Credit Losses	34,802	33,047	34,386
Commercial [Member]
Allowance for loan losses:
Balance at Beginning of Period	4,005	6,445
Additions:
Provision	130	531
Deductions:
Chargeoffs	(60)	(1,902)
Recoveries	168	462
Net Loan Losses	108	(1,440)
Balance at End of Period	4,243	5,536
Liability for Off-Balance Sheet Credit Exposure	1,672	1,663
Total Allowance for Credit Losses	5,915	7,199	5,663
Commercial Real Estate Loans [Member]
Allowance for loan losses:
Balance at Beginning of Period	12,070	10,063
Additions:
Provision	(974)	994
Deductions:
Chargeoffs		(113)
Recoveries	163	21
Net Loan Losses	163	(92)
Balance at End of Period	11,259	10,965
Liability for Off-Balance Sheet Credit Exposure		3
Total Allowance for Credit Losses	11,259	10,968	12,070
Construction [Member]
Allowance for loan losses:
Balance at Beginning of Period	602	484
Additions:
Provision	(160)	(4)
Deductions:
Recoveries	3
Net Loan Losses	3
Balance at End of Period	445	480
Liability for Off-Balance Sheet Credit Exposure	185
Total Allowance for Credit Losses	630	480	639
Residential Real Estate Loans [Member]
Allowance for loan losses:
Balance at Beginning of Period	405	380
Additions:
Provision	86	246
Deductions:
Chargeoffs		(87)
Net Loan Losses		(87)
Balance at End of Period	491	539
Total Allowance for Credit Losses	491	539	405
Consumer Installment And Other [Member]
Allowance for loan losses:
Balance at Beginning of Period	3,198	3,194
Additions:
Provision	214	281
Deductions:
Chargeoffs	(999)	(1,308)
Recoveries	400	601
Net Loan Losses	(599)	(707)
Balance at End of Period	2,813	2,768
Liability for Off-Balance Sheet Credit Exposure	440	453
Total Allowance for Credit Losses	3,253	3,221	3,695
Purchased Non-Covered Loans [Member]
Additions:
Provision	1,272
Deductions:
Chargeoffs	(260)
Recoveries	1
Net Loan Losses	(259)
Indemnification expiration	1,561
Balance at End of Period	2,574
Liability for Off-Balance Sheet Credit Exposure	251
Total Allowance for Credit Losses	2,825
Purchased Covered Loans [Member]
Allowance for loan losses:
Balance at Beginning of Period	1,561	1,005
Additions:
Provision		87
Deductions:
Chargeoffs		(359)
Recoveries		5
Net Loan Losses		(354)
Indemnification expiration	(1,561)
Balance at End of Period		738
Total Allowance for Credit Losses		738	1,561
Unallocated Financing Receivable [Member]
Allowance for loan losses:
Balance at Beginning of Period	9,852	8,663
Additions:
Provision	432	665
Deductions:
Balance at End of Period	10,284	9,328
Liability for Off-Balance Sheet Credit Exposure	145	574
Total Allowance for Credit Losses	$ 10,429	$ 9,902	$ 10,353