Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Securities - Investment Securities Continuous Unrealized Loss Position (Details)

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Note 4 - Securities - Investment Securities Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2022
Debt securities available for sale, less than twelve months, gross unrealized losses $ (2,591) $ (801)
Debt securities available for sale, less than twelve months, fair value 491,031 15,845
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (63,125) (68,365)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 508,710 535,836
Debt Securities, Available for Sale, Gross Unrealized Losses (65,716) (69,166)
Debt Securities, Available for Sale, Fair Value 999,741 551,681
Debt Securities held to maturity less than twelve months, gross unrealized losses (162) (1)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 9,895 430
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (82,269) (75,474)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value 771,382 902,933
Debt Securities, Held To Maturity , Gross Unrealized Losses (82,431) (75,475)
Debt Securities,Held To Maturity, Fair Value 779,735 903,363
US Treasury Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses (197)  
Debt securities available for sale, less than twelve months, fair value 479,762  
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 (197)  
Debt Securities, Available for Sale, Fair Value 479,762  
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 (25,065) (24,718)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value 368,868 484,267
Debt Securities, Held To Maturity , Gross Unrealized Losses (25,065) (24,718)
Debt Securities,Held To Maturity, Fair Value 368,868 484,267
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 (2) (6)
Debt securities available for sale, less than twelve months, fair value 161 704
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (26,674) (25,973)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 205,195 214,393
Debt Securities, Available for Sale, Gross Unrealized Losses (26,677) (25,979)
Debt Securities, Available for Sale, Fair Value 205,356 215,097
Debt Securities held to maturity less than twelve months, gross unrealized losses (162) (1)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 9,895 430
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (56,471) (50,024)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value 393,887 411,585
Debt Securities, Held To Maturity , Gross Unrealized Losses (56,634) (50,025)
Debt Securities,Held To Maturity, Fair Value 405,323 412,015
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 (1,186) (1,178)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 9,512 9,777
Debt Securities, Available for Sale, Gross Unrealized Losses (1,186) (1,178)
Debt Securities, Available for Sale, Fair Value 9,512 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 (733) (732)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value 7,086 7,081
Debt Securities, Held To Maturity , Gross Unrealized Losses (733) (732)
Debt Securities,Held To Maturity, Fair Value 7,086 7,081
Corporate Debt Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses (2,392) (794)
Debt securities available for sale, less than twelve months, fair value 11,108 15,141
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (35,265) (41,214)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 294,003 311,666
Debt Securities, Available for Sale, Gross Unrealized Losses (37,657) (42,009)
Debt Securities, Available for Sale, Fair Value $ 305,111 $ 326,807