Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Originated loans	$ 1,553,303	$ 1,664,183
Purchased covered loans	324,976	372,283
Purchased non-covered loans	61,062	74,891
Total	1,939,341	2,111,357
Commercial Portfolio Segment [Member] | Impaired [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Purchased covered loans	284	308
Purchased non-covered loans	660	1,261
Commercial Portfolio Segment [Member] | Non Impaired [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Purchased covered loans	42,386	59,135
Purchased non-covered loans	8,170	9,840
Commercial Portfolio Segment [Member] | Purchase Discount [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Purchased covered loans	(5,058)	(8,459)
Purchased non-covered loans	(876)	(870)
Commercial Portfolio Segment [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Originated loans	309,621	340,116
Total	355,187	401,331
Commercial Real Estate Portfolio Segment [Member] | Impaired [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Purchased covered loans	6,211	7,585
Purchased non-covered loans	2,621	6,763
Commercial Real Estate Portfolio Segment [Member] | Non Impaired [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Purchased covered loans	220,054	247,534
Purchased non-covered loans	34,758	38,673
Commercial Real Estate Portfolio Segment [Member] | Purchase Discount [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Purchased covered loans	(11,597)	(15,140)
Purchased non-covered loans	(1,002)	(1,748)
Commercial Real Estate Portfolio Segment [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Originated loans	614,005	632,927
Total	865,050	916,594
Construction Portfolio Segment [Member] | Impaired [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Purchased covered loans	1,649	1,824
Construction Portfolio Segment [Member] | Non Impaired [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Purchased covered loans	4,805	5,462
Purchased non-covered loans	1,330	1,619
Construction Portfolio Segment [Member] | Purchase Discount [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Purchased covered loans	(99)	(279)
Purchased non-covered loans		(95)
Construction Portfolio Segment [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Originated loans	8,015	7,984
Total	15,700	16,515
Residential Portfolio Segment [Member] | Non Impaired [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Purchased covered loans	9,280	9,374
Purchased non-covered loans	1,015	3,110
Residential Portfolio Segment [Member] | Purchase Discount [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Purchased covered loans	(434)	(433)
Purchased non-covered loans	(262)	(474)
Residential Portfolio Segment [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Originated loans	195,322	222,458
Total	204,921	234,035
Consumer Portfolio Segment [Member] | Impaired [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Purchased covered loans	254	257
Purchased non-covered loans	198	297
Consumer Portfolio Segment [Member] | Non Impaired [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Purchased covered loans	58,567	66,932
Purchased non-covered loans	15,919	18,554
Consumer Portfolio Segment [Member] | Purchase Discount [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Purchased covered loans	(1,326)	(1,817)
Purchased non-covered loans	(1,469)	(2,039)
Consumer Portfolio Segment [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Originated loans	426,340	460,698
Total	498,483	542,882
Impaired [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Purchased covered loans	8,398	9,974
Purchased non-covered loans	3,479	8,321
Non Impaired [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Purchased covered loans	335,092	388,437
Purchased non-covered loans	61,192	71,796
Purchase Discount [Member]
Note 4 - Loans and Allowance for Credit Losses (Details) - Loans receivable at carrying amount [Line Items]
Purchased covered loans	(18,514)	(26,128)
Purchased non-covered loans	$ (3,609)	$ (5,226)