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
Jun. 30, 2024
Dec. 31, 2023
Debt securities available for sale, less than twelve months, gross unrealized losses $ (3,061) $ (801)
Debt securities available for sale, less than twelve months, fair value 231,600 15,845
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (62,106) (68,365)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 497,820 535,836
Debt Securities, Available for Sale, Gross Unrealized Losses (65,166) (69,166)
Debt Securities, Available for Sale, Fair Value 729,420 551,681
Debt Securities held to maturity less than twelve months, gross unrealized losses (564) (1)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 41,186 430
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (82,475) (75,474)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value 636,364 902,933
Debt Securities, Held To Maturity , Gross Unrealized Losses (83,039) (75,475)
Debt Securities,Held To Maturity, Fair Value 677,549 903,363
Government Agency Securities 3,061 801
US Treasury Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses (340) 0
Debt securities available for sale, less than twelve months, fair value 164,413 0
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses 0 0
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 0 0
Debt Securities, Available for Sale, Gross Unrealized Losses (340) 0
Debt Securities, Available for Sale, Fair Value 164,413 0
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 (23,932) (24,718)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value 250,340 484,267
Debt Securities, Held To Maturity , Gross Unrealized Losses (23,932) (24,718)
Debt Securities,Held To Maturity, Fair Value 250,339 484,267
Government Agency Securities 340 (0)
Collateralized Mortgage-Backed Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses (87) (6)
Debt securities available for sale, less than twelve months, fair value 46,401 704
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (27,108) (25,973)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 194,850 214,393
Debt Securities, Available for Sale, Gross Unrealized Losses (27,195) (25,979)
Debt Securities, Available for Sale, Fair Value 241,251 215,097
Debt Securities held to maturity less than twelve months, gross unrealized losses (564) (1)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 41,186 430
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (57,815) (50,024)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value 378,928 411,585
Debt Securities, Held To Maturity , Gross Unrealized Losses (58,379) (50,025)
Debt Securities,Held To Maturity, Fair Value 420,114 412,015
Government Agency Securities 87 6
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 (1,162) (1,178)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 9,533 9,777
Debt Securities, Available for Sale, Gross Unrealized Losses (1,162) (1,178)
Debt Securities, Available for Sale, Fair Value 9,533 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 (728) (732)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value 7,096 7,081
Debt Securities, Held To Maturity , Gross Unrealized Losses (728) (732)
Debt Securities,Held To Maturity, Fair Value 7,096 7,081
Government Agency Securities (0) 0
Corporate Debt Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses (2,634) (794)
Debt securities available for sale, less than twelve months, fair value 20,786 15,141
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (33,836) (41,214)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 293,437 311,666
Debt Securities, Available for Sale, Gross Unrealized Losses (36,469) (42,009)
Debt Securities, Available for Sale, Fair Value 314,223 326,807
Government Agency Securities $ 2,634 794
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
Government Agency Securities   $ 0