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Note 10 - Borrowed Funds (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Mar. 28, 2019
Nov. 23, 2014
Mar. 13, 2014
Nov. 23, 2004
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Securities Sold under Agreements to Repurchase, Total         $ 0 $ 0  
Advance from Federal Home Loan Bank, Total         485,000 20,000  
Threshold for Deferred Bonus       $ 225,000      
Amount of Deferred Bonus Accrued in Other Liabilities     $ 300 $ 610      
Accrued Interest on Deferred Bonus 5.72% 5.06% 5.02% 7.00%      
Interest Expense, Other         116 110 $ 105
Accrued Bonuses         2,300 2,100  
Junior Subordinated Notes, Noncurrent         $ 119,100 $ 119,100  
Junior Subordinated Debt [Member]              
Debt Instrument, Term (Year)           30 years  
Debt Instrument, Interest Rate, Effective Percentage         4.01% 2.38%  
Interest Expense, Debt, Total         $ 4,800 $ 2,800 $ 3,600
Mature in May 2023 [Member]              
Advance from Federal Home Loan Bank, Total         300,000 20,000  
Mature in September 2024 [Member]              
Advance from Federal Home Loan Bank, Total         15,000    
Ten-year Treasury Note [Member]              
Debt Instrument, Basis Spread on Variable Rate   2.75%          
Debt Instrument, Term (Year)   10 years          
Five-year Treasury Note [Member]              
Debt Instrument, Basis Spread on Variable Rate 3.50%            
Debt Instrument, Term (Year) 5 years            
Over-night Borrowings [Member]              
Advance from Federal Home Loan Bank, Total         $ 150,000 0  
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate         4.65%    
Non Overnight Borrowings [Member]              
Advance from Federal Home Loan Bank, Total         $ 335,000 $ 20,000  
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate         4.54% 2.89%