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

Note 2 - Debt Securities - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities (Details)

v3.25.4
Note 2 - Debt Securities - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Available for sale, amortized cost $ 1,073,313 $ 1,207,059
Available for sale, gross unrealized gain 6,128 668
Available for sale, gross unrealized loss (10,616) (46,327)
Available for sale, fair value 1,068,825 1,161,400
Held to maturity, amortized cost 660,076 714,853
Held to maturity, gross unrealized gain 743 14
Held to maturity, gross unrealized loss (44,284) (75,371)
Held to maturity debt securities, fair value 616,535 639,496
US Treasury Securities [Member]    
Available for sale, amortized cost 520,100 617,350
Available for sale, gross unrealized gain 2,823 580
Available for sale, gross unrealized loss 0 (444)
Available for sale, fair value 522,923 617,486
Held to maturity, amortized cost 249,621 249,403
Held to maturity, gross unrealized gain 0 0
Held to maturity, gross unrealized loss (9,589) (19,632)
Held to maturity debt securities, fair value 240,032 229,771
Collateralized Mortgage-Backed Securities [Member]    
Available for sale, amortized cost 133,126 10,516
Available for sale, gross unrealized gain 1,030 1
Available for sale, gross unrealized loss (852) (1,000)
Available for sale, fair value 133,304 9,517
Held to maturity, amortized cost 402,097 457,365
Held to maturity, gross unrealized gain 743 14
Held to maturity, gross unrealized loss (34,395) (55,150)
Held to maturity debt securities, fair value 368,445 402,229
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 10,362  
Available for sale, gross unrealized gain 1  
Available for sale, gross unrealized loss (554)  
Available for sale, fair value 9,809  
Held to maturity, amortized cost 8,358 8,085
Held to maturity, gross unrealized gain 0 0
Held to maturity, gross unrealized loss (300) (589)
Held to maturity debt securities, fair value 8,058 7,496
Corporate Debt Securities [Member]    
Available for sale, amortized cost 409,725 335,758
Available for sale, gross unrealized gain 2,274 38
Available for sale, gross unrealized loss (9,210) (20,673)
Available for sale, fair value $ 402,789 315,123
US Government Agencies Debt Securities [Member]    
Available for sale, amortized cost   243,435
Available for sale, gross unrealized gain   49
Available for sale, gross unrealized loss   (24,210)
Available for sale, fair value   $ 219,274