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Note 3 - Loans and Allowance for Loan Losses (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Loans and Leases Receivable, Net of Deferred Income, Total $ 3,333,056,000   $ 3,333,056,000   $ 2,856,667,000
Loans and Leases Receivable Period Increase (Decrease)     $ 476,000,000    
Loans and Leases Receivable, Percentage Period Increase (Decrease)     16.70%    
Impaired Financing Receivable, Interest Income, Accrual Method, Total 400,000 $ 200,000 $ 600,000 $ 500,000  
Loans and Leases Receivable, Nonaccrual Loans, Interest Income Recognized 0 0 0 0  
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans 100,000 $ 100,000 $ 100,000 $ 100,000  
Minimum Number of Days Past Due at Period End For Loans Modified as Troubled Debt Restructurings (Day)     30 days    
Commercial Portfolio Segment [Member]          
Loans and Leases Receivable, Net of Deferred Income, Total 2,901,252,000   $ 2,901,252,000   2,441,544,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]          
Loans and Leases Receivable, Net of Deferred Income, Total [1] 1,307,455,000   1,307,455,000   846,551,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Grades 1-4 [Member]          
Loans and Leases Receivable, Net of Deferred Income, Total 1,008,010,000 [2]   1,008,010,000 [2]   $ 521,920,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | SBA, CARES Act, Paycheck Protection Program [Member]          
Loans and Leases Receivable, Net of Deferred Income, Total 549,000,000   549,000,000    
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | SBA, CARES Act, Paycheck Protection Program [Member] | Grades 1-4 [Member]          
Loans and Leases Receivable, Net of Deferred Income, Total $ 549,000,000   $ 549,000,000    
[1] For June 30, 2020, includes $549 million in loans originated under the Paycheck Protection Program.
[2] Included in Commercial and Industrial Loans Grades 1 - 4 are $549 million of loans originated under the Paycheck Protection Program.