Note 3 - Loans and Allowance for Credit Losses (Details) - Recorded Investment in Loans Evaluated for Impairment (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for credit losses:
Individually evaluated for impairment	$ 1,496	$ 2,852
Collectively evaluated for impairment	32,890	30,075
Total	34,386	32,927	35,290
Carrying value of loans:
Individually evaluated for impairment	21,042	29,023
Collectively evaluated for impairment	1,801,766	2,067,705
Purchased loans with evidence of credit deterioration	4,936	14,629
Total	1,827,744	2,111,357
Commercial [Member]
Allowance for credit losses:
Individually evaluated for impairment	100	1,865
Collectively evaluated for impairment	5,563	6,314
Total	5,663	8,179	7,672
Carrying value of loans:
Individually evaluated for impairment	3,901	5,153
Collectively evaluated for impairment	334,923	334,963
Total	338,824	340,116
Commercial Real Estate Loans [Member]
Allowance for credit losses:
Individually evaluated for impairment	1,243	134
Collectively evaluated for impairment	10,827	9,938
Total	12,070	10,072	10,611
Carrying value of loans:
Individually evaluated for impairment	3,357	4,161
Collectively evaluated for impairment	593,296	628,766
Total	596,653	632,927
Construction [Member]
Allowance for credit losses:
Collectively evaluated for impairment	639	484
Total	639	484	2,376
Carrying value of loans:
Collectively evaluated for impairment	10,723	7,984
Total	10,723	7,984
Residential Real Estate Loans [Member]
Allowance for credit losses:
Collectively evaluated for impairment	405	380
Total	405	380	781
Carrying value of loans:
Collectively evaluated for impairment	176,196	222,458
Total	176,196	222,458
Consumer Installment And Other [Member]
Allowance for credit losses:
Individually evaluated for impairment		100
Collectively evaluated for impairment	3,695	3,513
Total	3,695	3,613	3,270
Carrying value of loans:
Collectively evaluated for impairment	400,888	460,698
Total	400,888	460,698
Purchased Non-Covered Loans [Member]
Carrying value of loans:
Individually evaluated for impairment	3,785	3,029
Collectively evaluated for impairment	47,571	65,098
Purchased loans with evidence of credit deterioration	2,434	6,764
Total	53,790	74,891
Purchased Covered Loans [Member]
Allowance for credit losses:
Individually evaluated for impairment	153	753
Collectively evaluated for impairment	1,408	252
Total	1,561	1,005
Carrying value of loans:
Individually evaluated for impairment	9,999	16,680
Collectively evaluated for impairment	238,169	347,738
Purchased loans with evidence of credit deterioration	2,502	7,865
Total	250,670	372,283
Unallocated Financing Receivable [Member]
Allowance for credit losses:
Collectively evaluated for impairment	10,353	9,194
Total	$ 10,353	$ 9,194	$ 10,580