Note 4 - Loans and Allowance for Credit Losses (Details) - Loans by delinquency and nonaccrual status (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current and Accruing	$ 1,878,371		$ 2,050,959
30-89 Days Past Due and Accruing	29,993		27,489
Past Due 90 days or More and Accruing	315		614
Nonaccrual	30,662		32,295
Total Loans	1,939,341		2,111,357
Commercial Portfolio Segment [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current and Accruing	304,644		333,474
30-89 Days Past Due and Accruing	2,302		1,032
Nonaccrual	2,675		5,610
Total Loans	309,621		340,116
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	355,187		401,331
Commercial Real Estate Portfolio Segment [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current and Accruing	593,883		616,276
30-89 Days Past Due and Accruing	14,275		10,750
Nonaccrual	5,847		5,901
Total Loans	614,005		632,927
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	865,050		916,594
Construction Portfolio Segment [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current and Accruing	8,015		7,984
Total Loans	8,015		7,984
Construction Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	15,700		16,515
Residential Portfolio Segment [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current and Accruing	194,348		220,032
30-89 Days Past Due and Accruing	560		2,193
Nonaccrual	414		233
Total Loans	195,322		222,458
Residential Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	204,921		234,035
Consumer Portfolio Segment [Member] | Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current and Accruing	422,702		455,007
30-89 Days Past Due and Accruing	3,397		5,205
Past Due 90 days or More and Accruing	241		455
Nonaccrual			31
Total Loans	426,340		460,698
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Loans	498,483		542,882
Originated Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current and Accruing	1,523,592		1,632,773
30-89 Days Past Due and Accruing	20,534		19,180
Past Due 90 days or More and Accruing	241		455
Nonaccrual	8,936		11,775
Total Loans	1,553,303		1,664,183
Purchased Non-Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current and Accruing	54,447		65,567
30-89 Days Past Due and Accruing	1,712		1,821
Past Due 90 days or More and Accruing			4
Nonaccrual	4,903		7,499
Total Loans	61,062		74,891
Purchased Covered Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current and Accruing	300,332		352,619
30-89 Days Past Due and Accruing	7,747		6,488
Past Due 90 days or More and Accruing	74		155
Nonaccrual	16,823		13,021
Total Loans	$ 324,976	[1]	$ 372,283	[1]

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