Quarterly report pursuant to Section 13 or 15(d)

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

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Note 4 - Securities - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities (Details) - USD ($)
Sep. 30, 2024
Dec. 31, 2023
Available for sale, amortized cost $ 1,184,112,000 $ 969,090,000
Available for sale, gross unrealized gain 1,889,000 258,000
Available for sale, gross unrealized loss (46,994,000) (69,166,000)
Available for sale, fair value 1,139,007,000 900,183,000 [1]
Held to maturity, amortized cost 728,580,000 982,664,000 [1]
Held to maturity, gross unrealized gain 565,000 3,000
Held to maturity, gross unrealized loss (56,122,000) (75,475,000)
Held to maturity debt securities, fair value 673,023,000 907,191,000
US Treasury Securities [Member]    
Available for sale, amortized cost 566,247,000 340,556,000
Available for sale, gross unrealized gain 1,077,000 251,000
Available for sale, gross unrealized loss 0 0
Available for sale, fair value 567,324,000 340,807,000
Held to maturity, amortized cost 249,349,000 508,985,000
Held to maturity, gross unrealized gain 0 0
Held to maturity, gross unrealized loss (16,226,000) (24,718,000)
Held to maturity debt securities, fair value 233,123,000 484,267,000
Collateralized Mortgage-Backed Securities [Member]    
Available for sale, amortized cost 256,622,000 241,458,000
Available for sale, gross unrealized gain 798,000 6,000
Available for sale, gross unrealized loss (19,120,000) (25,979,000)
Available for sale, fair value 238,300,000 215,485,000
Held to maturity, amortized cost 471,151 465,615
Held to maturity, gross unrealized gain 565,000 3,000
Held to maturity, gross unrealized loss (39,398,000) (50,025,000)
Held to maturity debt securities, fair value 432,318,000 415,593,000
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 10,543,000 11,400,000
Available for sale, gross unrealized gain 1,000 1,000
Available for sale, gross unrealized loss (826,000) (1,178,000)
Available for sale, fair value 9,718,000 10,223,000
Held to maturity, amortized cost 8,080,000 8,063,000
Held to maturity, gross unrealized gain 0 0
Held to maturity, gross unrealized loss (498,000) (732,000)
Held to maturity debt securities, fair value 7,582,000 7,331,000
Corporate Debt Securities [Member]    
Available for sale, amortized cost 350,700,000 375,676,000
Available for sale, gross unrealized gain 13,000 0
Available for sale, gross unrealized loss (27,048,000) (42,009,000)
Available for sale, fair value $ 323,665,000 $ 333,667,000
[1] Derived from audited financial statements.