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Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Securities held-to-maturity, amortized cost | $ 75,200 |  |  |  |  |
Securities held-to-maturity, amortized cost | 74,115 |  | $ 57,868 |  |  |
Securities held-to-maturity, fair value | 64,560 |  | 62,029 |  |  |
Securities held-to-maturity, gross Unrecognized gains |  |  | 3,299 |  |  |
Securities held-to-maturity, gross Unrecognized losses | 10,640 |  |  |  |  |
Securities held-to-maturity, allowance for credit losses | (1,085) | $ (986) | (862) | $ (844) | $ (915) | $ (907)
Securities available for sale, amortized cost, total other securities | 930,362 |  | 786,425 |  |  |
Securities available for sale, fair value | 857,654 |  | 777,236 |  |  |
Securities available for sale, gross unrealized gains | 126 |  | 3,031 |  |  |
Securities available for sale, gross unrealized losses | 72,834 |  | 12,220 |  |  |
Other Securities [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 1,662 |  | 1,695 |  |  |
Securities available for sale, fair value | 1,662 |  | 1,695 |  |  |
Securities available for sale, gross unrealized gains | 0 |  | 0 |  |  |
Securities available for sale, gross unrealized losses | 0 |  | 0 |  |  |
US Government Agencies Debt Securities [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 84,463 |  | 5,599 |  |  |
Securities available for sale, fair value | 83,039 |  | 5,590 |  |  |
Securities available for sale, gross unrealized gains | 10 |  | 0 |  |  |
Securities available for sale, gross unrealized losses | 1,434 |  | 9 |  |  |
Corporate Debt Securities [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 133,927 |  | 107,423 |  |  |
Securities available for sale, fair value | 124,468 |  | 104,370 |  |  |
Securities available for sale, gross unrealized gains | 72 |  | 136 |  |  |
Securities available for sale, gross unrealized losses | 9,531 |  | 3,189 |  |  |
US States and Political Subdivisions Debt Securities [Member] |  |  |  |  |  |
Securities held-to-maturity, amortized cost | 67,315 |  | 50,836 |  |  |
Securities held-to-maturity, fair value | 57,064 |  | 53,362 |  |  |
Securities held-to-maturity, gross Unrecognized gains |  |  | 2,526 |  |  |
Securities held-to-maturity, gross Unrecognized losses | 10,251 |  |  |  |  |
Mutual Fund Debt Securities [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 11,573 |  | 12,485 |  |  |
Securities available for sale, fair value | 11,573 |  | 12,485 |  |  |
Securities available for sale, gross unrealized gains | 0 |  | 0 |  |  |
Securities available for sale, gross unrealized losses | 0 |  | 0 |  |  |
Collateralized Debt Obligations [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 131,094 |  | 81,166 |  |  |
Securities available for sale, fair value | 125,978 |  | 80,912 |  |  |
Securities available for sale, gross unrealized gains | 0 |  | 1 |  |  |
Securities available for sale, gross unrealized losses | 5,116 |  | 255 |  |  |
Other Debt Obligations [Member] |  |  |  |  |  |
Securities held-to-maturity, amortized cost | 67,315 |  | 50,836 |  |  |
Securities held-to-maturity, amortized cost | 66,230 |  | 49,974 |  |  |
Securities held-to-maturity, fair value | 57,064 |  | 53,362 |  |  |
Securities held-to-maturity, gross Unrecognized gains |  |  | 2,526 |  |  |
Securities held-to-maturity, gross Unrecognized losses | 10,251 |  |  |  |  |
Securities held-to-maturity, allowance for credit losses | (1,085) |  | (862) |  |  |
Securities available for sale, fair value | 346,720 |  | 205,052 |  |  |
Collateralized Mortgage Backed Securities [Member] |  |  |  |  |  |
Securities held-to-maturity, amortized cost | 7,885 |  | 7,894 |  |  |
Securities held-to-maturity, amortized cost | 7,885 |  | 7,894 |  |  |
Securities held-to-maturity, fair value | 7,496 |  | 8,667 |  |  |
Securities held-to-maturity, gross Unrecognized gains |  |  | 773 |  |  |
Securities held-to-maturity, gross Unrecognized losses | 389 |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 567,643 |  | 578,057 |  |  |
Securities available for sale, fair value | 510,934 |  | 572,184 |  |  |
Securities available for sale, gross unrealized gains | 44 |  | 2,894 |  |  |
Securities available for sale, gross unrealized losses | 56,753 |  | 8,767 |  |  |
REMIC and CMO [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 187,243 |  | 210,948 |  |  |
Securities available for sale, fair value | 169,144 |  | 208,509 |  |  |
Securities available for sale, gross unrealized gains | 6 |  | 1,217 |  |  |
Securities available for sale, gross unrealized losses | 18,105 |  | 3,656 |  |  |
GNMA [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 9,638 |  | 10,572 |  |  |
Securities available for sale, fair value | 8,257 |  | 10,286 |  |  |
Securities available for sale, gross unrealized gains | 12 |  | 30 |  |  |
Securities available for sale, gross unrealized losses | 1,393 |  | 316 |  |  |
FNMA [Member] |  |  |  |  |  |
Securities held-to-maturity, amortized cost | 7,885 |  | 7,894 |  |  |
Securities held-to-maturity, fair value | 7,496 |  | 8,667 |  |  |
Securities held-to-maturity, gross Unrecognized gains |  |  | 773 |  |  |
Securities held-to-maturity, gross Unrecognized losses | 389 |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 209,747 |  | 203,777 |  |  |
Securities available for sale, fair value | 189,975 |  | 202,938 |  |  |
Securities available for sale, gross unrealized gains | 5 |  | 1,321 |  |  |
Securities available for sale, gross unrealized losses | 19,777 |  | 2,160 |  |  |
FHLMC [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 161,015 |  | 152,760 |  |  |
Securities available for sale, fair value | 143,558 |  | 150,451 |  |  |
Securities available for sale, gross unrealized gains | 21 |  | 326 |  |  |
Securities available for sale, gross unrealized losses | 17,478 |  | 2,635 |  |  |
Available for Sale Securities Excluding Mortgage Backed Securities [Member] |  |  |  |  |  |
Securities available for sale, amortized cost, total other securities | 362,719 |  | 208,368 |  |  |
Securities available for sale, fair value | 346,720 |  | 205,052 |  |  |
Securities available for sale, gross unrealized gains | 82 |  | 137 |  |  |
Securities available for sale, gross unrealized losses | $ 16,081 |  | $ 3,453 |  |  |

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