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 ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Available for sale, amortized cost $ 688,397 $ 707,376
Available for sale, gross unrealized gain 12 6
Available for sale, gross unrealized loss (63,461) (62,567)
Available for sale, fair value 624,948 644,815 [1]
Held to maturity, amortized cost 1,021,989 1,034,121 [1]
Held to maturity, gross unrealized gain 10 7
Held to maturity, gross unrealized loss (84,038) (98,175)
Held to maturity debt securities, fair value 937,961 935,953 [1]
US Treasury Securities [Member]    
Available for sale, amortized cost 3,001 3,002
Available for sale, gross unrealized gain 0 0
Available for sale, gross unrealized loss (11) (33)
Available for sale, fair value 2,990 2,969
Held to maturity, amortized cost 507,601 507,151
Held to maturity, gross unrealized gain 0 0
Held to maturity, gross unrealized loss (30,021) (36,197)
Held to maturity debt securities, fair value 477,580 470,954
US Government Agencies Debt Securities [Member]    
Available for sale, amortized cost 4 9
Available for sale, gross unrealized gain 0 0
Available for sale, gross unrealized loss 0 0
Available for sale, fair value 4 9
Collateralized Mortgage-Backed Securities [Member]    
Available for sale, amortized cost 272,070 282,480
Available for sale, gross unrealized gain 7 5
Available for sale, gross unrealized loss (29,046) (32,782)
Available for sale, fair value 243,031 249,703
Held to maturity, amortized cost 506,342 518,929
Held to maturity, gross unrealized gain 10 7
Held to maturity, gross unrealized loss (53,190) (60,960)
Held to maturity debt securities, fair value 453,162 457,976
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 14,646 15,205
Available for sale, gross unrealized gain 2 1
Available for sale, gross unrealized loss (1,337) (1,597)
Available for sale, fair value 13,311 13,609
Held to maturity, amortized cost 8,046 8,041
Held to maturity, gross unrealized gain 0 0
Held to maturity, gross unrealized loss (827) (1,018)
Held to maturity debt securities, fair value 7,219 7,023
Corporate Debt Securities [Member]    
Available for sale, amortized cost 398,676 406,680
Available for sale, gross unrealized gain 3 0
Available for sale, gross unrealized loss (33,067) (28,155)
Available for sale, fair value $ 365,612 $ 378,525
[1] derived from audited financial statements.