Quarterly report [Sections 13 or 15(d)]

Note 4 - Securities - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities (Details)

v3.25.1
Note 4 - Securities - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities (Details) - USD ($)
Mar. 31, 2025
Dec. 31, 2024
Available for sale, amortized cost $ 1,239,919,000 $ 1,207,059,000
Available for sale, gross unrealized gain 2,643,000 668,000
Available for sale, gross unrealized loss (38,725,000) (46,327,000)
Available for sale, fair value 1,203,837,000 1,161,400,000
Held to maturity, amortized cost 701,713,000 714,853,000
Held to maturity, gross unrealized gain 109,000 14,000
Held to maturity, gross unrealized loss (62,367,000) (75,371,000)
Held to maturity debt securities, fair value 639,455,000 639,496,000
US Treasury Securities [Member]    
Available for sale, amortized cost 674,821,000 617,350,000
Available for sale, gross unrealized gain 2,244,000 580,000
Available for sale, gross unrealized loss (2,000) (444,000)
Available for sale, fair value 677,063,000 617,486,000
Held to maturity, amortized cost 249,457,000 249,403,000
Held to maturity, gross unrealized gain 0 0
Held to maturity, gross unrealized loss (15,765,000) (19,632,000)
Held to maturity debt securities, fair value 233,692,000 229,771,000
Collateralized Mortgage-Backed Securities [Member]    
Available for sale, amortized cost 232,819,000 243,435,000
Available for sale, gross unrealized gain 398,000 49,000
Available for sale, gross unrealized loss (20,068,000) (24,210,000)
Available for sale, fair value 213,149,000 219,274,000
Held to maturity, amortized cost 444,165 457,365
Held to maturity, gross unrealized gain 109,000 14,000
Held to maturity, gross unrealized loss (46,105,000) (55,150,000)
Held to maturity debt securities, fair value 398,169,000 402,229,000
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 10,514,000 10,516,000
Available for sale, gross unrealized gain 1,000 1,000
Available for sale, gross unrealized loss (830,000) (1,000,000)
Available for sale, fair value 9,685,000 9,517,000
Held to maturity, amortized cost 8,091,000 8,085,000
Held to maturity, gross unrealized gain 0 0
Held to maturity, gross unrealized loss (497,000) (589,000)
Held to maturity debt securities, fair value 7,594,000 7,496,000
Corporate Debt Securities [Member]    
Available for sale, amortized cost 321,765,000 335,758,000
Available for sale, gross unrealized gain 0 38,000
Available for sale, gross unrealized loss (17,825,000) (20,673,000)
Available for sale, fair value $ 303,940,000 $ 315,123,000