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Note 8 - Other Borrowings (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 24, 2025
Jan. 14, 2022
Dec. 15, 2021
Dec. 31, 2025
Dec. 31, 2024
Long-Term Federal Home Loan Bank Advances       $ 326,221 $ 387,083
Line of Credit Facility, Maximum Borrowing Capacity       1,080,000  
Line of Credit Facility, Remaining Borrowing Capacity       $ 777,000  
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]     Secured Overnight Financing Rate (SOFR) [Member] Secured Overnight Financing Rate (SOFR) [Member]  
Subordinated Notes [Member]          
Subordinated Debt, Principal Amount   $ 15,000 $ 75,000    
Subordinated Borrowing, Interest Rate     3.25%    
Subordinated Borrowing, Redemption Price, Percentage of Principal Amount     100.00%    
Debt Instrument, Basis Spread on Variable Rate     2.12%    
Proceeds Injected, Increase to Equity Capital From Issuance of Subordinated Long-term Debt   $ 15,000 $ 70,000    
Debt Issuance Costs, Gross       $ 300 700
Term Note [Member]          
Debt Instrument, Face Amount $ 30,000        
Debt Instrument, Interest Rate, Stated Percentage 1.70%        
Debt Instrument, Periodic Payment, Principal $ 2,500        
Term Note [Member] | Minimum [Member]          
Debt Instrument, Basis Spread on Variable Rate 0.00%        
Federal Home Loan Bank of Indianapolis [Member] | Bullet Advances [member]          
Long-Term Federal Home Loan Bank Advances       $ 300,000 $ 360,000
Federal Home Loan Bank of Indianapolis [Member] | Bullet Advances [member] | Minimum [Member]          
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End       0.90% 0.70%
Federal Home Loan Bank of Indianapolis [Member] | Bullet Advances [member] | Maximum [Member]          
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End       4.50% 4.54%
Federal Home Loan Bank of Indianapolis [Member] | Bullet Advances [member] | Weighted Average [Member]          
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End       3.27% 3.10%
Federal Home Loan Bank of Indianapolis [Member] | Amortizing Advances [Member]          
Long-Term Federal Home Loan Bank Advances       $ 26,200 $ 27,100
Federal Home Loan Bank of Indianapolis [Member] | Amortizing Advances [Member] | Weighted Average [Member]          
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate at Period End       2.52% 2.52%