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
Jun. 30, 2022
Dec. 31, 2021
Available for sale, amortized cost $ 759,185 $ 830,546
Available for sale, gross unrealized gain 666 15,425
Available for sale, gross unrealized loss (35,388) (3,402)
Available for sale, fair value 724,463 842,570 [1]
Held to maturity, amortized cost 1,065,755 462,957
Held to maturity, gross unrealized gain 56 5,278
Held to maturity, gross unrealized loss (61,971) (1,949)
Held to maturity debt securities, fair value 1,003,840 466,286 [1]
US Treasury Securities [Member]    
Available for sale, amortized cost 6,004 9,003
Available for sale, gross unrealized gain 0 101
Available for sale, gross unrealized loss (38) 0
Available for sale, fair value 5,966 9,104
Held to maturity, amortized cost 506,246 149,263
Held to maturity, gross unrealized gain 0 25
Held to maturity, gross unrealized loss (22,750) (668)
Held to maturity debt securities, fair value 483,496 148,620
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 308,033 424,372
Available for sale, gross unrealized gain 43 3,474
Available for sale, gross unrealized loss (22,648) (2,685)
Available for sale, fair value 285,428 425,161
Held to maturity, amortized cost 551,480 310,641
Held to maturity, gross unrealized gain 56 5,251
Held to maturity, gross unrealized loss (38,538) (1,271)
Held to maturity debt securities, fair value 512,998 314,621
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 17,446 21,531
Available for sale, gross unrealized gain 5 173
Available for sale, gross unrealized loss (1,171) (70)
Available for sale, fair value 16,280 21,634
Held to maturity, amortized cost 8,030 3,053
Held to maturity, gross unrealized gain 0 2
Held to maturity, gross unrealized loss (683) (10)
Held to maturity debt securities, fair value 7,347 3,045
Corporate Debt Securities [Member]    
Available for sale, amortized cost 427,688 369,618
Available for sale, gross unrealized gain 618 11,659
Available for sale, gross unrealized loss (11,531) (647)
Available for sale, fair value $ 416,775 $ 380,630
[1] derived from audited financial statements.