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

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

v3.25.4
Note 2 - Debt Securities - Investment Securities Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Debt securities available for sale, less than twelve months, gross unrealized losses $ (984) $ (1,758)
Debt securities available for sale, less than twelve months, fair value 77,583 276,720
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (9,632) (44,570)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 187,749 472,739
Debt Securities, Available for Sale, Gross Unrealized Losses (10,616) (46,328)
Debt Securities, Available for Sale, Fair Value 265,332 749,459
Debt Securities held to maturity less than twelve months, gross unrealized losses (34) (536)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 2,954 40,115
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (44,250) (74,835)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value 569,943 593,233
Debt Securities, Held To Maturity , Gross Unrealized Losses (44,284) (75,371)
Debt Securities, Held To Maturity, Fair Value 572,897 633,348
US Treasury Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses 0 (445)
Debt securities available for sale, less than twelve months, fair value 0 250,547
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (852) 0
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 22,662 0
Debt Securities, Available for Sale, Gross Unrealized Losses (852) (445)
Debt Securities, Available for Sale, Fair Value 22,662 250,547
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 (9,589) (19,632)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value 240,032 229,771
Debt Securities, Held To Maturity , Gross Unrealized Losses (9,589) (19,632)
Debt Securities, Held To Maturity, Fair Value 240,032 229,771
Collateralized Mortgage-Backed Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses 0 (6)
Debt securities available for sale, less than twelve months, fair value 0 577
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (554) (24,204)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 9,363 179,178
Debt Securities, Available for Sale, Gross Unrealized Losses (554) (24,210)
Debt Securities, Available for Sale, Fair Value 9,363 179,755
Debt Securities held to maturity less than twelve months, gross unrealized losses 0 (536)
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 0 40,115
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (34,395) (54,614)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value 325,307 356,215
Debt Securities, Held To Maturity , Gross Unrealized Losses (34,395) (55,150)
Debt Securities, Held To Maturity, Fair Value 325,307 396,330
Corporate Debt Securities [Member]    
Debt securities available for sale, less than twelve months, gross unrealized losses (984) (1,307)
Debt securities available for sale, less than twelve months, fair value 77,583 25,596
Debt Securities Available for Sale, Twelve Months or More, Gross Unrealized Losses (8,226) (19,366)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value 155,724 284,489
Debt Securities, Available for Sale, Gross Unrealized Losses (9,210) (20,673)
Debt Securities, Available for Sale, Fair Value 233,307 310,085
US States and Political Subdivisions 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   (1,000)
Debt Securities, Available for Sale, Twelve Months or More, Fair Value   9,072
Debt Securities, Available for Sale, Gross Unrealized Losses   (1,000)
Debt Securities, Available for Sale, Fair Value   9,072
Debt Securities held to maturity less than twelve months, gross unrealized losses (34) 0
Debt securities, held to maturity, Less Than Twelve Months, Fair Value 2,954 0
Debt Securities Held To Maturity, Twelve Months or More, Gross Unrealized Losses (266) (589)
Debt Securities, Held To Maturity, Twelve Months or More, Fair Value 4,604 7,247
Debt Securities, Held To Maturity , Gross Unrealized Losses (300) (589)
Debt Securities, Held To Maturity, Fair Value $ 7,558 $ 7,247