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Note 5 - Loans and Allowance for Credit Losses (Details) - Loans and Leases by Credit Quality Indicator - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income $ 4,550,897 $ 4,312,399 $ 3,279,429
Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 4,452,306 4,202,744 3,186,340
Watch and Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 57,631 64,345 56,098
Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 40,960 45,310 36,991
Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 960,506 916,226 726,611
Commercial Portfolio Segment [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 920,429 875,102 695,191
Commercial Portfolio Segment [Member] | Watch and Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 22,111 23,512 14,015
Commercial Portfolio Segment [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 17,966 17,612 17,405
Income Producing Portfolio Segment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 1,863,583 1,703,172 1,302,479
Income Producing Portfolio Segment [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 1,837,021 1,679,101 1,286,730
Income Producing Portfolio Segment [Member] | Watch and Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 24,191 18,962 12,836
Income Producing Portfolio Segment [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 2,371 5,109 2,913
Owner Occupied Portfolio Segment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 497,834 461,581 330,073
Owner Occupied Portfolio Segment [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 487,922 445,013 313,523
Owner Occupied Portfolio Segment [Member] | Watch and Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 8,085 9,677 13,320
Owner Occupied Portfolio Segment [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 1,827 6,891 3,230
Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 149,842 148,018 123,587
Residential Portfolio Segment [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 149,101 147,262 122,681
Residential Portfolio Segment [Member] | Watch and Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 741 756 906
Construction Portfolio Segment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 955,751 851,464 680,632
Construction Portfolio Segment [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 937,069 827,503 654,631
Construction Portfolio Segment [Member] | Watch and Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 791 9,720 13,119
Construction Portfolio Segment [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 17,891 14,241 12,882
Home Equity Portfolio Segment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 118,544 122,536 108,931
Home Equity Portfolio Segment [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 115,945 119,420 106,468
Home Equity Portfolio Segment [Member] | Watch and Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 1,712 1,718 1,902
Home Equity Portfolio Segment [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 887 1,398 561
Other Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 4,837 109,402 7,116
Other Consumer Portfolio Segment [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 4,819 109,343 $ 7,116
Other Consumer Portfolio Segment [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income $ 18 $ 59