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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2022
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Alternative [Abstract] |
Accumulated Other Comprehensive Income (Loss) | The following table represents changes in AOCI by component, net of tax, for the period below (dollars in thousands):
| Three Months Ended September 30,
| 2022 |  | 2021
| Before Tax |  | Tax Effect |  | Net of Tax |  | Before Tax |  | Tax Effect |  | Net of Tax
Unrealized gains (losses) on debt securities available for sale |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (277,310) |  |  | $ | 79,047 |  |  | $ | (198,263) |  |  | $ | 17,013 |  |  | $ | (4,850) |  |  | $ | 12,163 |
Unrealized holding gains (losses) on debt securities available for sale, net | (96,937) |  |  | 27,631 |  |  | (69,306) |  |  | (17,198) |  |  | 4,902 |  |  | (12,296) |
Amounts reclassified from AOCI, net | 74 |  |  | (21) |  |  | 53 |  |  | 5 |  |  | (1) |  |  | 4 |
Amortization of unrealized losses on securities transferred to held to maturity | 1,806 |  |  | (515) |  |  | 1,291 |  |  | — |  |  | — |  |  | — |
Balance at end of period | $ | (372,367) |  |  | $ | 106,142 |  |  | $ | (266,225) |  |  | $ | (180) |  |  | $ | 51 |  |  | $ | (129) |
Unrealized gains (losses) on cash flow hedges |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (17,963) |  |  | $ | 5,119 |  |  | $ | (12,844) |  |  | $ | (2,012) |  |  | $ | 574 |  |  | $ | (1,438) |
Unrealized holding gains (losses) on cash flow hedges, net | (14,253) |  |  | 4,061 |  |  | (10,192) |  |  | (7) |  |  | 2 |  |  | (5) |
Amounts reclassified from AOCI, net | 370 |  |  | (104) |  |  | 266 |  |  | 288 |  |  | (82) |  |  | 206 |
Balance at end of period | $ | (31,846) |  |  | $ | 9,076 |  |  | $ | (22,770) |  |  | $ | (1,731) |  |  | $ | 494 |  |  | $ | (1,237) |
Total AOCI | $ | (404,213) |  |  | $ | 115,218 |  |  | $ | (288,995) |  |  | $ | (1,911) |  |  | $ | 545 |  |  | $ | (1,366) |
| Nine Months Ended September 30,
| 2022 |  | 2021
| Before Tax |  | Tax Effect |  | Net of Tax |  | Before Tax |  | Tax Effect |  | Net of Tax
Unrealized gains (losses) on debt securities available for sale |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (32,272) |  |  | $ | 9,199 |  |  | $ | (23,073) |  |  | $ | 49,644 |  |  | $ | (14,151) |  |  | $ | 35,493 |
Unrealized holding gains (losses) on debt securities available for sale, net | (296,507) |  |  | 84,519 |  |  | (211,988) |  |  | (49,801) |  |  | 14,195 |  |  | (35,606) |
Unrealized losses on debt securities transferred to held to maturity from available for sale | (48,456) |  |  | 13,812 |  |  | (34,644) |  |  | — |  |  | — |  |  | — |
Amounts reclassified from AOCI, net | (28) |  |  | 8 |  |  | (20) |  |  | (23) |  |  | 7 |  |  | (16) |
Amortization of unrealized losses on securities transferred to held to maturity | 4,896 |  |  | (1,396) |  |  | 3,500 |  |  | — |  |  | — |  |  | — |
Balance at end of period | $ | (372,367) |  |  | $ | 106,142 |  |  | $ | (266,225) |  |  | $ | (180) |  |  | $ | 51 |  |  | $ | (129) |
Unrealized gains (losses) on cash flow hedges |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (958) |  |  | $ | 273 |  |  | $ | (685) |  |  | $ | (3,055) |  |  | $ | 871 |  |  | $ | (2,184) |
Unrealized holding gains (losses) on cash flow hedges, net | (30,191) |  |  | 8,604 |  |  | (21,587) |  |  | 470 |  |  | (134) |  |  | 336 |
Amounts reclassified from AOCI, net | (697) |  |  | 199 |  |  | (498) |  |  | 854 |  |  | (243) |  |  | 611 |
Balance at end of period | $ | (31,846) |  |  | $ | 9,076 |  |  | $ | (22,770) |  |  | $ | (1,731) |  |  | $ | 494 |  |  | $ | (1,237) |
Total AOCI | $ | (404,213) |  |  | $ | 115,218 |  |  | $ | (288,995) |  |  | $ | (1,911) |  |  | $ | 545 |  |  | $ | (1,366) |

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