Annual report pursuant to Section 13 and 15(d)

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

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Note 2 - Debt Securities - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities (Details) - USD ($)
Dec. 31, 2023
Dec. 31, 2022
Available for sale, amortized cost $ 969,090,000 $ 707,376,000
Available for sale, gross unrealized gain 258,000 6,000
Available for sale, gross unrealized loss (69,166,000) (62,567,000)
Available for sale, fair value 900,183,000 644,815,000 [1]
Held to maturity, amortized cost 982,664,000 1,034,121,000 [1]
Held to maturity, gross unrealized gain 3,000 7,000
Held to maturity, gross unrealized loss (75,475,000) (98,175,000)
Held to maturity debt securities, fair value 907,191,000 935,953,000
US Treasury Securities [Member]    
Available for sale, amortized cost 340,556,000 3,002,000
Available for sale, gross unrealized gain 251,000 0
Available for sale, gross unrealized loss 0 (33,000)
Available for sale, fair value 340,807,000 2,969,000
Held to maturity, amortized cost 508,985,000 507,151,000
Held to maturity, gross unrealized gain 0 0
Held to maturity, gross unrealized loss (24,718,000) (36,197,000)
Held to maturity debt securities, fair value 484,267,000 470,954,000
Collateralized Mortgage-Backed Securities [Member]    
Available for sale, amortized cost 241,458,000 282,480,000
Available for sale, gross unrealized gain 6,000 5,000
Available for sale, gross unrealized loss (25,979,000) (32,782,000)
Available for sale, fair value 215,485,000 249,703,000
Held to maturity, amortized cost 465,615,000 518,929,000
Held to maturity, gross unrealized gain 3,000 7,000
Held to maturity, gross unrealized loss (50,025,000) (60,960,000)
Held to maturity debt securities, fair value 415,593,000 457,976,000
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 11,400,000 15,205,000
Available for sale, gross unrealized gain 1,000 1,000
Available for sale, gross unrealized loss (1,178,000) (1,597,000)
Available for sale, fair value 10,223,000 13,609,000
Held to maturity, amortized cost 8,063,000 8,041,000
Held to maturity, gross unrealized gain 0 0
Held to maturity, gross unrealized loss (732,000) (1,018,000)
Held to maturity debt securities, fair value 7,331,000 7,023,000
Corporate Debt Securities [Member]    
Available for sale, amortized cost 375,676,000 406,680,000
Available for sale, gross unrealized gain 0 0
Available for sale, gross unrealized loss (42,009,000) (28,155,000)
Available for sale, fair value $ 333,667,000 378,525,000
US Government Agencies Debt Securities [Member]    
Available for sale, amortized cost   9,000
Available for sale, gross unrealized gain   0
Available for sale, gross unrealized loss   0
Available for sale, fair value   $ 9,000
[1] derived from audited financial statements.