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 ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Available for sale, amortized cost $ 707,376 $ 830,546
Available for sale, gross unrealized gain 6 15,426
Available for sale, gross unrealized loss (62,567) (3,402)
Available for sale, fair value 644,815 842,570 [1]
Held to maturity debt securities (fair value of $935,953 at December 31, 2022 and $466,286 at December 31, 2021) 1,034,121 462,957 [1]
Held to maturity, gross unrealized gain 7 5,278
Held to maturity, gross unrealized loss (98,175) (1,949)
Held to maturity debt securities, fair value 935,953 466,286 [1]
US Treasury Securities [Member]    
Available for sale, amortized cost 3,002 9,003
Available for sale, gross unrealized gain 0 101
Available for sale, gross unrealized loss (33) 0
Available for sale, fair value 2,969 9,104
Held to maturity debt securities (fair value of $935,953 at December 31, 2022 and $466,286 at December 31, 2021) 507,151 149,263
Held to maturity, gross unrealized gain 0 25
Held to maturity, gross unrealized loss (36,197) (668)
Held to maturity debt securities, fair value 470,954 148,620
US Government Agencies Debt Securities [Member]    
Available for sale, amortized cost 9 6,022
Available for sale, gross unrealized gain 0 19
Available for sale, gross unrealized loss 0 0
Available for sale, fair value 9 6,041
Collateralized Mortgage-Backed Securities [Member]    
Available for sale, amortized cost 282,480 424,372
Available for sale, gross unrealized gain 5 3,474
Available for sale, gross unrealized loss (32,782) (2,685)
Available for sale, fair value 249,703 425,161
Held to maturity debt securities (fair value of $935,953 at December 31, 2022 and $466,286 at December 31, 2021) 518,929 310,641
Held to maturity, gross unrealized gain 7 5,251
Held to maturity, gross unrealized loss (60,960) (1,271)
Held to maturity debt securities, fair value 457,976 314,621
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 15,205 21,531
Available for sale, gross unrealized gain 1 173
Available for sale, gross unrealized loss (1,597) (70)
Available for sale, fair value 13,609 21,634
Held to maturity debt securities (fair value of $935,953 at December 31, 2022 and $466,286 at December 31, 2021) 8,041 3,053
Held to maturity, gross unrealized gain 0 2
Held to maturity, gross unrealized loss (1,018) (10)
Held to maturity debt securities, fair value 7,023 3,045
Corporate Debt Securities [Member]    
Available for sale, amortized cost 406,680 369,618
Available for sale, gross unrealized gain 0 11,659
Available for sale, gross unrealized loss (28,155) (647)
Available for sale, fair value $ 378,525 $ 380,630
[1] derived from audited financial statements.