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Note 5 - Loans and Allowance for Credit Losses (Details) - Loans and Leases by Credit Quality Indicator - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income $ 4,776,965 $ 4,312,399 $ 3,432,548
Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 4,687,145 4,202,744 3,328,827
Watch and Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 49,907 64,345 59,948
Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 39,913 45,310 43,773
Commercial Portfolio Segment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 1,007,659 916,226 798,489
Commercial Portfolio Segment [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 977,165 875,102 761,502
Commercial Portfolio Segment [Member] | Watch and Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 17,625 23,512 19,202
Commercial Portfolio Segment [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 12,869 17,612 17,785
Income Producing Portfolio Segment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 2,022,950 1,703,172 1,382,839
Income Producing Portfolio Segment [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 1,999,509 1,679,101 1,362,060
Income Producing Portfolio Segment [Member] | Watch and Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 16,564 18,962 18,069
Income Producing Portfolio Segment [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 6,877 5,109 2,710
Owner Occupied Portfolio Segment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 489,657 461,581 337,422
Owner Occupied Portfolio Segment [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 479,843 445,013 320,960
Owner Occupied Portfolio Segment [Member] | Watch and Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 8,024 9,677 11,408
Owner Occupied Portfolio Segment [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 1,790 6,891 5,054
Residential Portfolio Segment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 147,720 148,018 126,263
Residential Portfolio Segment [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 146,992 147,262 125,363
Residential Portfolio Segment [Member] | Watch and Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 728 756 900
Construction Portfolio Segment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 987,752 851,464 676,582
Construction Portfolio Segment [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 964,854 827,503 650,679
Construction Portfolio Segment [Member] | Watch and Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 5,254 9,720 8,424
Construction Portfolio Segment [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 17,644 14,241 17,479
Home Equity Portfolio Segment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 115,346 122,536 107,291
Home Equity Portfolio Segment [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 112,978 119,420 104,601
Home Equity Portfolio Segment [Member] | Watch and Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 1,707 1,718 1,945
Home Equity Portfolio Segment [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 661 1,398 745
Other Consumer Portfolio Segment [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 5,881 109,402 3,662
Other Consumer Portfolio Segment [Member] | Pass [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 5,804 109,343 $ 3,662
Other Consumer Portfolio Segment [Member] | Watch and Special Mention [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income 5    
Other Consumer Portfolio Segment [Member] | Substandard [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Loans and Leases Receivable Net of Deferred Income $ 72 $ 59