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Note 3 - Loans and Allowance for Credit Losses (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, before Allowance for Credit Loss, Total $ 4,303,758 $ 3,916,619  
Financing Receivable, Nonaccrual, Interest Income 200 100 $ 100
Financing Receivable, Revolving, Converted to Term Loan During Period 6,400 1,300  
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) (2,000) (1,700)  
Financing Receivable, Individually Evaluated for Impairment 5,400 13,200  
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment 400 2,600  
Commercial Portfolio Segment [Member]      
Financing Receivable, before Allowance for Credit Loss, Total $ 3,415,299 $ 3,131,830  
Financing Receivables, Prepayment Speed Assumed 2.00% 2.00%  
Commercial Portfolio Segment [Member] | Commercial and Industrial, Credit Cards to Business Customers [Member]      
Financing Receivable, before Allowance for Credit Loss, Total $ 17,800 $ 16,600  
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]      
Financing Receivable, before Allowance for Credit Loss, Total [1] 332,609 266,468  
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]      
Financing Receivable, before Allowance for Credit Loss, Total [1] 1,035,684 979,214  
Retail Portfolio Segment [Member]      
Financing Receivable, before Allowance for Credit Loss, Total 888,459 784,789  
Retail Portfolio Segment [Member] | Home Equity Loan [Member]      
Financing Receivable, before Allowance for Credit Loss, Total 38,100 37,400  
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]      
Financing Receivable, before Allowance for Credit Loss, Total [2] $ 837,406 $ 755,036  
Financing Receivables, Prepayment Speed Assumed 9.00% 16.10%  
Financing Receivables, Allowance for Credit Loss, Increase From Decrease of Prepayment Speed Assumed $ 5,300    
Retail Portfolio Segment [Member] | Other Consumer Loans [Member]      
Financing Receivable, before Allowance for Credit Loss, Total [3] $ 51,053 $ 29,753  
Financing Receivables, Prepayment Speed Assumed 9.00% 9.00%  
Commercial Real Estate Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Reclassification Between Loan Segments [Member]      
Increase (Decrease) in Finance Receivables   $ 54,500  
Commercial Real Estate Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | Reclassification Between Loan Segments [Member]      
Increase (Decrease) in Finance Receivables   $ (54,500)  
[1] We have reclassified multi-family construction loans from real estate - non-owner occupied loans to real estate - multi-family and residential rental loans. The table above reflects a classification change of $54.5 million as of December 31, 2022. All the tables that follow have been adjusted to reflect the reclassifications as of the applicable dates.
[2] Home equity lines of credit were reclassified from 1-4 family mortgage loans to other consumer loans during the year ended December 31, 2023. Home equity lines of credit totaled $38.1 million and $37.4 million as of December 31, 2023, and 2022, respectively.
[3] Credit cards to business customers were reclassified from other consumer loans to commercial and industrial during the year ended December 31, 2023. Credit cards to business customers totaled $17.8 million and $16.6 million as of December 31, 2023, and 2022, respectively.