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)

v3.25.2
Note 4 - Securities - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities (Details) - USD ($)
Jun. 30, 2025
Dec. 31, 2024
Available for sale, amortized cost $ 1,251,951,000 $ 1,207,059,000
Available for sale, gross unrealized gain 3,628,000 668,000
Available for sale, gross unrealized loss (27,728,000) (46,327,000)
Available for sale, fair value 1,227,851,000 1,161,400,000 [1]
Held to maturity, amortized cost 686,652,000 714,853,000 [1]
Held to maturity, gross unrealized gain 131,000 14,000
Held to maturity, gross unrealized loss (56,678,000) (75,371,000)
Held to maturity debt securities, fair value 630,105,000 639,496,000
US Treasury Securities [Member]    
Available for sale, amortized cost 699,077,000 617,350,000
Available for sale, gross unrealized gain 2,442,000 580,000
Available for sale, gross unrealized loss (37,000) (444,000)
Available for sale, fair value 701,482,000 617,486,000
Held to maturity, amortized cost 249,511,000 249,403,000
Held to maturity, gross unrealized gain 0 0
Held to maturity, gross unrealized loss (13,349,000) (19,632,000)
Held to maturity debt securities, fair value 236,162,000 229,771,000
Collateralized Mortgage-Backed Securities [Member]    
Available for sale, amortized cost 187,193,000 243,435,000
Available for sale, gross unrealized gain 568,000 49,000
Available for sale, gross unrealized loss (9,610,000) (24,210,000)
Available for sale, fair value 178,151,000 219,274,000
Held to maturity, amortized cost 428,794 457,365
Held to maturity, gross unrealized gain 131,000 14,000
Held to maturity, gross unrealized loss (42,904,000) (55,150,000)
Held to maturity debt securities, fair value 386,021,000 402,229,000
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 10,366,000 10,516,000
Available for sale, gross unrealized gain 1,000 1,000
Available for sale, gross unrealized loss (728,000) (1,000,000)
Available for sale, fair value 9,639,000 9,517,000
Held to maturity, amortized cost 8,347,000 8,085,000
Held to maturity, gross unrealized gain 0 0
Held to maturity, gross unrealized loss (425,000) (589,000)
Held to maturity debt securities, fair value 7,922,000 7,496,000
Corporate Debt Securities [Member]    
Available for sale, amortized cost 355,315,000 335,758,000
Available for sale, gross unrealized gain 617,000 38,000
Available for sale, gross unrealized loss (17,353,000) (20,673,000)
Available for sale, fair value $ 338,579,000 $ 315,123,000
[1] Derived from audited financial statements.