Note 3 - Loans and Allowance for Credit Losses (Details) - Credit Risk Profile by Internally Assigned Grade (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Grade:
Loans by grade	$ 1,827,744	$ 2,111,357
Commercial [Member] | Pass [Member]
Grade:
Loans by grade	329,667	324,452
Commercial [Member] | Substandard [Member]
Grade:
Loans by grade	8,142	11,413
Commercial [Member] | Doubtful [Member]
Grade:
Loans by grade	1,015	4,251
Commercial [Member]
Grade:
Loans by grade	338,824	340,116
Commercial Real Estate Loans [Member] | Pass [Member]
Grade:
Loans by grade	554,991	599,472
Commercial Real Estate Loans [Member] | Substandard [Member]
Grade:
Loans by grade	41,662	33,455
Commercial Real Estate Loans [Member]
Grade:
Loans by grade	596,653	632,927
Construction [Member] | Pass [Member]
Grade:
Loans by grade	10,274	7,518
Construction [Member] | Substandard [Member]
Grade:
Loans by grade	449	466
Construction [Member]
Grade:
Loans by grade	10,723	7,984
Residential Real Estate Loans [Member] | Pass [Member]
Grade:
Loans by grade	174,113	219,655
Residential Real Estate Loans [Member] | Substandard [Member]
Grade:
Loans by grade	2,083	2,803
Residential Real Estate Loans [Member]
Grade:
Loans by grade	176,196	222,458
Consumer Installment And Other [Member] | Pass [Member]
Grade:
Loans by grade	399,377	459,076
Consumer Installment And Other [Member] | Substandard [Member]
Grade:
Loans by grade	1,127	1,158
Consumer Installment And Other [Member] | Doubtful [Member]
Grade:
Loans by grade	19	46
Consumer Installment And Other [Member] | Unlikely to be Collected Financing Receivable [Member]
Grade:
Loans by grade	365	418
Consumer Installment And Other [Member]
Grade:
Loans by grade	400,888	460,698
Purchased Non-Covered Loans [Member] | Pass [Member]
Grade:
Loans by grade	41,490	51,901
Purchased Non-Covered Loans [Member] | Substandard [Member]
Grade:
Loans by grade	14,587	27,066
Purchased Non-Covered Loans [Member] | Doubtful [Member]
Grade:
Loans by grade	958	1,145
Purchased Non-Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Grade:
Loans by grade		5
Purchased Non-Covered Loans [Member] | Default Risk Purchase Discount [Member]
Grade:
Loans by grade	(3,245)	(5,226)
Purchased Non-Covered Loans [Member]
Grade:
Loans by grade	53,790	74,891
Purchased Covered Loans [Member] | Pass [Member]
Grade:
Loans by grade	196,882	274,976
Purchased Covered Loans [Member] | Substandard [Member]
Grade:
Loans by grade	64,624	122,815
Purchased Covered Loans [Member] | Doubtful [Member]
Grade:
Loans by grade	97	470
Purchased Covered Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Grade:
Loans by grade		150
Purchased Covered Loans [Member] | Default Risk Purchase Discount [Member]
Grade:
Loans by grade	(10,933)	(26,128)
Purchased Covered Loans [Member]
Grade:
Loans by grade	250,670	372,283
Pass [Member]
Grade:
Loans by grade	1,706,794	1,937,050
Substandard [Member]
Grade:
Loans by grade	132,674	199,176
Doubtful [Member]
Grade:
Loans by grade	2,089	5,912
Unlikely to be Collected Financing Receivable [Member]
Grade:
Loans by grade	365	573
Default Risk Purchase Discount [Member]
Grade:
Loans by grade	$ (14,178)	$ (31,354)