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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2023
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Alternative [Abstract] |
Accumulated other comprehensive income (loss) | The following tables present changes in AOCI by component, net of tax, for the periods indicated (dollars in thousands):
| Three Months Ended September 30,
| 2023 |  | 2022
| Before Tax |  | Tax Effect |  | Net of Tax |  | Before Tax |  | Tax Effect |  | Net of Tax
Unrealized/Unrecognized gains (losses) on debt securities |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (335,359) |  |  | $ | 95,591 |  |  | $ | (239,768) |  |  | $ | (277,310) |  |  | $ | 79,047 |  |  | $ | (198,263) |
Unrealized holding gains (losses) on debt securities available for sale, net | (37,696) |  |  | 10,746 |  |  | (26,950) |  |  | (96,937) |  |  | 27,631 |  |  | (69,306) |
Amounts reclassified from AOCI, net | 33 |  |  | (9) |  |  | 24 |  |  | 74 |  |  | (21) |  |  | 53 |
Amortization of unrecognized losses on securities transferred to held to maturity | 1,476 |  |  | (420) |  |  | 1,056 |  |  | 1,806 |  |  | (515) |  |  | 1,291 |
Balance at end of period | $ | (371,546) |  |  | $ | 105,908 |  |  | $ | (265,638) |  |  | $ | (372,367) |  |  | $ | 106,142 |  |  | $ | (266,225) |
Unrealized gains (losses) on cash flow hedges |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (29,586) |  |  | $ | 8,433 |  |  | $ | (21,153) |  |  | $ | (17,963) |  |  | $ | 5,119 |  |  | $ | (12,844) |
Unrealized holding gains (losses) on cash flow hedges, net | (7,797) |  |  | 2,220 |  |  | (5,577) |  |  | (14,253) |  |  | 4,061 |  |  | (10,192) |
Amounts reclassified from AOCI, net | 2,290 |  |  | (652) |  |  | 1,638 |  |  | 370 |  |  | (104) |  |  | 266 |
Balance at end of period | $ | (35,093) |  |  | $ | 10,001 |  |  | $ | (25,092) |  |  | $ | (31,846) |  |  | $ | 9,076 |  |  | $ | (22,770) |
Total AOCI | $ | (406,639) |  |  | $ | 115,909 |  |  | $ | (290,730) |  |  | $ | (404,213) |  |  | $ | 115,218 |  |  | $ | (288,995) |
| Nine Months Ended September 30,
| 2023 |  | 2022
| Before Tax |  | Tax Effect |  | Net of Tax |  | Before Tax |  | Tax Effect |  | Net of Tax
Unrealized/Unrecognized gains (losses) on debt securities |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (352,878) |  |  | $ | 100,585 |  |  | $ | (252,293) |  |  | $ | (32,272) |  |  | $ | 9,199 |  |  | $ | (23,073) |
Unrealized holding gains (losses) on debt securities available for sale, net | (23,600) |  |  | 6,728 |  |  | (16,872) |  |  | (296,507) |  |  | 84,519 |  |  | (211,988) |
Unrecognized losses on debt securities transferred to held to maturity from available for sale | — |  |  | — |  |  | — |  |  | (48,456) |  |  | 13,812 |  |  | (34,644) |
Amounts reclassified from AOCI, net | 207 |  |  | (59) |  |  | 148 |  |  | (28) |  |  | 8 |  |  | (20) |
Amortization of unrecognized losses on securities transferred to held to maturity | 4,725 |  |  | (1,346) |  |  | 3,379 |  |  | 4,896 |  |  | (1,396) |  |  | 3,500 |
Balance at end of period | $ | (371,546) |  |  | $ | 105,908 |  |  | $ | (265,638) |  |  | $ | (372,367) |  |  | $ | 106,142 |  |  | $ | (266,225) |
Unrealized gains (losses) on cash flow hedges |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (29,350) |  |  | $ | 8,365 |  |  | $ | (20,985) |  |  | $ | (958) |  |  | $ | 273 |  |  | $ | (685) |
Unrealized holding gains (losses) on cash flow hedges, net | (11,975) |  |  | 3,412 |  |  | (8,563) |  |  | (30,191) |  |  | 8,604 |  |  | (21,587) |
Amounts reclassified from AOCI, net | 6,232 |  |  | (1,776) |  |  | 4,456 |  |  | (697) |  |  | 199 |  |  | (498) |
Balance at end of period | $ | (35,093) |  |  | $ | 10,001 |  |  | $ | (25,092) |  |  | $ | (31,846) |  |  | $ | 9,076 |  |  | $ | (22,770) |
Total AOCI | $ | (406,639) |  |  | $ | 115,909 |  |  | $ | (290,730) |  |  | $ | (404,213) |  |  | $ | 115,218 |  |  | $ | (288,995) |

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