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
Sep. 30, 2021
Dec. 31, 2020
Available for sale, amortized cost $ 707,186 $ 861,156
Available for sale, gross unrealized gain 17,733 26,054
Available for sale, gross unrealized loss (1,595) (522)
Available for sale, fair value 723,324 886,688 [1]
Held to maturity debt securities (fair value of $261,276 at September 30, 2021 and $250 at December 31, 2020) 261,276 250 [1]
Held to maturity, gross unrealized gain 0 0
Held to maturity, gross unrealized loss 0 0
Held to maturity debt securities, fair value 261,276 250 [1]
US Treasury Securities [Member]    
Available for sale, amortized cost 14,001 13,993
Available for sale, gross unrealized gain 178 364
Available for sale, gross unrealized loss 0 0
Available for sale, fair value 14,179 14,357
US Government Agencies Debt Securities [Member]    
Available for sale, amortized cost 9,023 15,228
Available for sale, gross unrealized gain 61 230
Available for sale, gross unrealized loss 0 0
Available for sale, fair value 9,084 15,458
Collateralized Mortgage Backed Securities [Member]    
Available for sale, amortized cost 294,887 477,407
Available for sale, gross unrealized gain 4,693 17,720
Available for sale, gross unrealized loss (1,032) (18)
Available for sale, fair value 298,548 495,109
Held to maturity debt securities (fair value of $261,276 at September 30, 2021 and $250 at December 31, 2020) 261,026 0
Held to maturity, gross unrealized gain 0 0
Held to maturity, gross unrealized loss 0 0
Held to maturity debt securities, fair value 261,026 0
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 21,414 37,671
Available for sale, gross unrealized gain 221 444
Available for sale, gross unrealized loss (38) 0
Available for sale, fair value 21,597 38,115
Held to maturity debt securities (fair value of $261,276 at September 30, 2021 and $250 at December 31, 2020) 250 250
Held to maturity, gross unrealized gain 0 0
Held to maturity, gross unrealized loss 0 0
Held to maturity debt securities, fair value 250 250
Corporate Debt Securities [Member]    
Available for sale, amortized cost 367,861 316,857
Available for sale, gross unrealized gain 12,580 7,296
Available for sale, gross unrealized loss (525) (504)
Available for sale, fair value $ 379,916 $ 323,649
[1] Derived from audited financial statements.