Note 4 - Loans and Allowance for Credit Losses (Details) - Loans by Delinquency and Nonaccrual Status (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current and Accruing	$ 1,778,357		$ 1,785,530
30-59 Days Past Due and Accruing	17,878		15,595
60-89 Days Past Due and Accruing	2,290		4,907
Past Due 90 days or More and Accruing	405		410
Nonaccrual	17,389		21,302
Total Loans	1,816,319		1,827,744
Commercial Portfolio Segment [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current and Accruing	357,553		336,497
30-59 Days Past Due and Accruing	1,220		677
60-89 Days Past Due and Accruing	31		383
Nonaccrual	1,347		1,267
Total Loans	360,151		338,824
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	383,660		364,159
Commercial Real Estate Portfolio Segment [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current and Accruing	584,385		586,619
30-59 Days Past Due and Accruing	7,585		4,012
60-89 Days Past Due and Accruing	253		2,473
Nonaccrual	2,987		3,549
Total Loans	595,210		596,653
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	787,676		799,019
Construction Portfolio Segment [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current and Accruing	9,837		10,275
Nonaccrual			448
Total Loans	9,837		10,723
Construction Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	12,986		13,896
Residential Portfolio Segment [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current and Accruing	167,842		173,082
30-59 Days Past Due and Accruing	2,010		2,789
60-89 Days Past Due and Accruing			325
Nonaccrual	324
Total Loans	170,176		176,196
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	175,327		185,057
Consumer Portfolio Segment [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current and Accruing	391,252		396,725
30-59 Days Past Due and Accruing	2,134		3,035
60-89 Days Past Due and Accruing	381		606
Past Due 90 days or More and Accruing	196		410
Nonaccrual	165		112
Total Loans	394,128		400,888
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	456,670		465,613
Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current and Accruing	1,510,869		1,503,198
30-59 Days Past Due and Accruing	12,949		10,513
60-89 Days Past Due and Accruing	665		3,787
Past Due 90 days or More and Accruing	196		410
Nonaccrual	4,823		5,376
Total Loans	1,529,502		1,523,284
Purchased Non-Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current and Accruing	248,629		45,755
30-59 Days Past Due and Accruing	4,910		4,237
60-89 Days Past Due and Accruing	1,620		180
Past Due 90 days or More and Accruing	209
Nonaccrual	12,480		3,618
Total Loans	267,848		53,790
Purchased Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current and Accruing	18,859		236,577
30-59 Days Past Due and Accruing	19		845
60-89 Days Past Due and Accruing	5		940
Nonaccrual	86		12,308
Total Loans	$ 18,969	[1]	$ 250,670	[1]

[1] Credit risk profile reflects internally assigned grade of purchased covered loans without regard to FDIC indemnification.