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Note 12 - Commitments and Off-balance Sheet Risk - Exposure to Credit Losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Contractual amounts of financial instruments with off-balance sheet risk $ 2,101,302 $ 2,113,504
Standby Letters of Credit [Member]    
Contractual amounts of financial instruments with off-balance sheet risk 26,491 19,393
Unused lines of Credit [Member] | Commercial Portfolio Segment [Member]    
Contractual amounts of financial instruments with off-balance sheet risk 1,488,782 1,557,429
Unused lines of Credit [Member] | One to Four Family Mortgages [Member]    
Contractual amounts of financial instruments with off-balance sheet risk 84,298 74,120
Unused lines of Credit [Member] | Credit Card Lines of Credit [Member]    
Contractual amounts of financial instruments with off-balance sheet risk 172,273 142,096
Unused lines of Credit [Member] | Consumer Other Financing Receivable 1 [Member]    
Contractual amounts of financial instruments with off-balance sheet risk 33,892 50,063
Loan Origination Commitments [Member]    
Contractual amounts of financial instruments with off-balance sheet risk $ 295,566 $ 270,403