Annual report [Section 13 and 15(d), not S-K Item 405]

Note 2 - Debt Securities - Investment Securities Continuous Unrealized Loss Position (Details)

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Note 2 - Debt Securities - Investment Securities Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Debt securities available for sale, less than twelve months, gross unrealized losses $ (1,758) $ (801)
Debt securities available for sale, less than twelve months, fair value 276,720 15,845
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (44,570) (68,365)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 472,739 535,836
Debt Securities, Available for Sale, Gross Unrealized Losses (46,328) (69,166)
Debt Securities, Available for Sale, Fair Value 749,459 551,681
Debt Securities held to maturity less than twelve months, gross unrealized losses (536) (1)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 40,115 430
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (74,835) (75,474)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value 593,233 902,933
Debt Securities, Held To Maturity , Gross Unrealized Losses (75,371) (75,475)
Debt Securities, Held To Maturity, Fair Value 633,348 903,363
US Treasury Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses (445)  
Debt securities available for sale, less than twelve months, fair value 250,547  
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses 0  
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 0  
Debt Securities, Available for Sale, Gross Unrealized Losses (445)  
Debt Securities, Available for Sale, Fair Value 250,547  
Debt Securities held to maturity less than twelve months, gross unrealized losses 0 0
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 0 0
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (19,632) (24,718)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value 229,771 484,267
Debt Securities, Held To Maturity , Gross Unrealized Losses (19,632) (24,718)
Debt Securities, Held To Maturity, Fair Value 229,771 484,267
US Government Agencies Debt Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses 0  
Debt securities available for sale, less than twelve months, fair value 0  
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses 0  
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 0  
Debt Securities, Available for Sale, Gross Unrealized Losses 0  
Debt Securities, Available for Sale, Fair Value 0  
Collateralized Mortgage-Backed Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses (6) (6)
Debt securities available for sale, less than twelve months, fair value 577 704
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (24,204) (25,973)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 179,178 214,393
Debt Securities, Available for Sale, Gross Unrealized Losses (24,210) (25,979)
Debt Securities, Available for Sale, Fair Value 179,755 215,097
Debt Securities held to maturity less than twelve months, gross unrealized losses (536) (1)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 40,115 430
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (54,614) (50,024)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value 356,215 411,585
Debt Securities, Held To Maturity , Gross Unrealized Losses (55,150) (50,025)
Debt Securities, Held To Maturity, Fair Value 396,330 412,015
US States and Political Subdivisions Debt Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses 0 0
Debt securities available for sale, less than twelve months, fair value 0 0
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (1,000) (1,178)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 9,072 9,777
Debt Securities, Available for Sale, Gross Unrealized Losses (1,000) (1,178)
Debt Securities, Available for Sale, Fair Value 9,072 9,777
Debt Securities held to maturity less than twelve months, gross unrealized losses 0 0
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 0 0
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (589) (732)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value 7,247 7,081
Debt Securities, Held To Maturity , Gross Unrealized Losses (589) (732)
Debt Securities, Held To Maturity, Fair Value 7,247 7,081
Corporate Debt Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses (1,307) (794)
Debt securities available for sale, less than twelve months, fair value 25,596 15,141
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (19,366) (41,214)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 284,489 311,666
Debt Securities, Available for Sale, Gross Unrealized Losses (20,673) (42,009)
Debt Securities, Available for Sale, Fair Value $ 310,085 $ 326,807