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Note 5 - Loans and the Allowance for Credit Losses (Details Textual)
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
Jun. 30, 2022
USD ($)
Jun. 30, 2021
Dec. 31, 2021
USD ($)
Loans and Leases Receivable, Gross $ 7,282,423,000   $ 7,282,423,000   $ 6,838,351,000
Loans and Leases Receivable, Net of Deferred Income 7,274,573,000   7,274,573,000   6,828,622,000
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 0   0    
Financing Receivable, Troubled Debt Restructuring $ 73,900,000   $ 73,900,000   79,500,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 0 0 0 0  
Financing Receivable, Modifications, Number of Contracts     2 10  
Extended Maturity [Member]          
Financing Receivable, Modifications, Number of Contracts       9  
Troubled Debt Restructurings [Member]          
Financing Receivable, Allowance for Credit Loss, Ending Balance $ 9,100,000   $ 9,100,000   10,400,000
Nonperforming Financial Instruments [Member]          
Financing Receivable, Troubled Debt Restructuring 27,500,000   27,500,000   35,900,000
Performing Financial Instruments [Member]          
Financing Receivable, Troubled Debt Restructuring 46,400,000   46,400,000   43,600,000
Asset Pledged as Collateral [Member] | Federal Home Loan Bank Advances [Member]          
Loans and Leases Receivable, Net of Deferred Income 2,500,000,000   2,500,000,000   2,500,000,000
Commercial Portfolio Segment [Member]          
Loans and Leases Receivable, Gross [1] 1,354,625,000   $ 1,354,625,000   1,299,428,000
Financing Receivable, Modifications, Number of Contracts     1 3  
Commercial Portfolio Segment [Member] | Paycheck Protection Program CARES Act [Member]          
Loans and Leases Receivable, Gross 18,000,000.0   $ 18,000,000.0   93,100,000
Commercial Real Estate Portfolio Segment [Member]          
Loans and Leases Receivable, Gross $ 5,107,382,000   $ 5,107,382,000   $ 4,741,590,000
Financing Receivable, Modifications, Number of Contracts     1 3  
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]          
Financing Receivable, Troubled Debt Restructuring, One Time Principal Payment     $ 500,000    
Commercial Real Estate Portfolio Segment [Member] | Recast of Nonaccrual Credit [Member]          
Financing Receivable, Modifications, Number of Contracts       1  
[1] Included in commercial loans as of June 30, 2022 and December 31, 2021 are PPP loans of $18.0 million and $93.1 million, respectively.