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Note 5 - Loans and Allowance for Credit Losses (Details) - Loans and Leases by Credit Quality Indicator - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income $ 4,998,368 $ 4,312,399
Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 4,920,279 4,202,744
Watch and Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 46,573 64,345
Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 31,516 45,310
Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 0 0
Commercial Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 1,052,257 916,226
Commercial Portfolio Segment [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 1,021,427 875,102
Commercial Portfolio Segment [Member] | Watch and Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 17,822 23,512
Commercial Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 13,008 17,612
Commercial Portfolio Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 0 0
Income Producing Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 2,115,478 1,703,172
Income Producing Portfolio Segment [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 2,096,032 1,679,101
Income Producing Portfolio Segment [Member] | Watch and Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 13,328 18,962
Income Producing Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 6,118 5,109
Income Producing Portfolio Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 0 0
Owner Occupied Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 498,103 461,581
Owner Occupied Portfolio Segment [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 488,496 445,013
Owner Occupied Portfolio Segment [Member] | Watch and Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 7,854 9,677
Owner Occupied Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 1,753 6,891
Owner Occupied Portfolio Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 0 0
Residential Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 147,365 148,018
Residential Portfolio Segment [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 146,651 147,262
Residential Portfolio Segment [Member] | Watch and Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 714 756
Residential Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 0 0
Residential Portfolio Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 0 0
Construction Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 1,065,376 851,464
Construction Portfolio Segment [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 1,049,926 827,503
Construction Portfolio Segment [Member] | Watch and Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 4,996 9,720
Construction Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 10,454 14,241
Construction Portfolio Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 0 0
Home Equity Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 112,885 122,536
Home Equity Portfolio Segment [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 110,870 119,420
Home Equity Portfolio Segment [Member] | Watch and Special Mention [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 1,854 1,718
Home Equity Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 161 1,398
Home Equity Portfolio Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 0 0
Other Consumer Portfolio Segment [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 6,904 109,402
Other Consumer Portfolio Segment [Member] | Pass [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 6,877 109,343
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 0
Other Consumer Portfolio Segment [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income 22 59
Other Consumer Portfolio Segment [Member] | Doubtful [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Loans and Leases Receivable Net of Deferred Income $ 0 $ 0