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)

v3.22.1
Note 4 - Securities - Amortized Cost and Fair Value of Available-for-sale and Held-to-maturity Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Available for sale, amortized cost $ 803,314 $ 830,546
Available for sale, gross unrealized gain 4,312 15,425
Available for sale, gross unrealized loss (22,953) (3,402)
Available for sale, fair value 784,673 842,570 [1]
Held to maturity, amortized cost 833,304 462,957
Held to maturity, gross unrealized gain 399 5,278
Held to maturity, gross unrealized loss (34,356) (1,949)
Held to maturity debt securities, fair value 799,347 466,286 [1]
US Treasury Securities [Member]    
Available for sale, amortized cost 6,005 9,003
Available for sale, gross unrealized gain 14 101
Available for sale, gross unrealized loss (9) 0
Available for sale, fair value 6,010 9,104
Held to maturity, amortized cost 346,414 149,263
Held to maturity, gross unrealized gain 16 25
Held to maturity, gross unrealized loss (14,370) (668)
Held to maturity debt securities, fair value 332,060 148,620
US Government Agencies Debt Securities [Member]    
Available for sale, amortized cost 14 6,022
Available for sale, gross unrealized gain 0 19
Available for sale, gross unrealized loss 0 0
Available for sale, fair value 14 6,041
Collateralized Mortgage-Backed Securities [Member]    
Available for sale, amortized cost 356,119 424,372
Available for sale, gross unrealized gain 200 3,474
Available for sale, gross unrealized loss (17,185) (2,685)
Available for sale, fair value 339,134 425,161
Held to maturity, amortized cost 478,865 310,641
Held to maturity, gross unrealized gain 383 5,251
Held to maturity, gross unrealized loss (19,542) (1,271)
Held to maturity debt securities, fair value 459,706 314,621
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 20,350 21,531
Available for sale, gross unrealized gain 23 173
Available for sale, gross unrealized loss (707) (70)
Available for sale, fair value 19,666 21,634
Held to maturity, amortized cost 8,025 3,053
Held to maturity, gross unrealized gain 0 2
Held to maturity, gross unrealized loss (444) (10)
Held to maturity debt securities, fair value 7,581 3,045
Corporate Debt Securities [Member]    
Available for sale, amortized cost 420,826 369,618
Available for sale, gross unrealized gain 4,075 11,659
Available for sale, gross unrealized loss (5,052) (647)
Available for sale, fair value $ 419,849 $ 380,630
[1] derived from audited financial statements.