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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance, net of tax | $ 1,201,948 | $ 1,161,957 | $ 1,145,977 | $ 1,319,112
Unrealized/Unrecognized gains (losses) on debt securities |  |  |  |
Unrealized holding gains (losses) on debt securities available for sale, net of tax | (26,950) | (69,306) | (16,872) | (211,988)
Unrealized losses on debt securities transferred to held to maturity from available for sale, net of tax | 0 | 0 | 0 | (34,644)
Amounts reclassified from AOCI, net of tax | (24) | (53) | (148) | 20
Amortization of unrealized losses on securities transferred to held to maturity, net of tax | (1,056) | (1,291) | (3,379) | (3,500)
Unrealized gains (losses) on cash flow hedges |  |  |  |
Unrealized holding gains (losses) on cash flow hedges, net of tax | (5,577) | (10,192) | (8,563) | (21,587)
Amounts reclassified from AOCI, net of tax | (1,638) | (266) | (4,456) | 498
Ending balance, net of tax | 1,190,158 | 1,106,588 | 1,190,158 | 1,106,588
AOCI |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance, net of tax | (260,921) | (211,107) | (273,278) | (23,758)
Unrealized gains (losses) on cash flow hedges |  |  |  |
Accumulated other comprehensive income (loss) ending balance period, before tax | (406,639) | (404,213) | (406,639) | (404,213)
Accumulated other comprehensive income (loss) ending balance period, tax effect | 115,909 | 115,218 | 115,909 | 115,218
Ending balance, net of tax | (290,730) | (288,995) | (290,730) | (288,995)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Accumulated other comprehensive income (loss) beginning balance period, before tax | (335,359) | (277,310) | (352,878) | (32,272)
Accumulated other comprehensive income (loss) beginning balance period, tax effect | 95,591 | 79,047 | 100,585 | 9,199
Beginning balance, net of tax | (239,768) | (198,263) | (252,293) | (23,073)
Unrealized/Unrecognized gains (losses) on debt securities |  |  |  |
Unrealized holding gains (losses) on debt securities available for sale, before tax | (37,696) | (96,937) | (23,600) | (296,507)
Unrealized holding gains (losses) on debt securities available for sale, tax effect | 10,746 | 27,631 | 6,728 | 84,519
Unrealized holding gains (losses) on debt securities available for sale, net of tax | (26,950) | (69,306) | (16,872) | (211,988)
Unrealized losses on debt securities transferred to held to maturity from available for sale, before tax |  |  | 0 | (48,456)
Unrealized losses on debt securities transferred to held to maturity from available for sale, tax effect | 0 | 0 | 0 | 13,812
Unrealized losses on debt securities transferred to held to maturity from available for sale, net of tax |  |  | 0 | (34,644)
Amounts reclassified from AOCI, before tax | 33 | 74 | 207 | (28)
Reclassification adjustment for realized (gains) losses on debt securities available for sale included in net income, tax expense (benefit) | (9) | (21) | (59) | 8
Amounts reclassified from AOCI, net of tax | 24 | 53 | 148 | (20)
Amortization of unrealized losses on securities transferred to held to maturity, before tax | 1,476 | 1,806 | 4,725 | 4,896
Amortization of unrealized losses on securities transferred to held to maturity, tax effect | 420 | 515 | 1,346 | 1,396
Amortization of unrealized losses on securities transferred to held to maturity, net of tax | 1,056 | 1,291 | 3,379 | 3,500
Unrealized gains (losses) on cash flow hedges |  |  |  |
Accumulated other comprehensive income (loss) ending balance period, before tax | (371,546) | (372,367) | (371,546) | (372,367)
Accumulated other comprehensive income (loss) ending balance period, tax effect | 105,908 | 106,142 | 105,908 | 106,142
Ending balance, net of tax | (265,638) | (266,225) | (265,638) | (266,225)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Accumulated other comprehensive income (loss) beginning balance period, before tax | (29,586) | (17,963) | (29,350) | (958)
Accumulated other comprehensive income (loss) beginning balance period, tax effect | 8,433 | 5,119 | 8,365 | 273
Beginning balance, net of tax | (21,153) | (12,844) | (20,985) | (685)
Unrealized gains (losses) on cash flow hedges |  |  |  |
Unrealized holding gains (losses) on cash flow hedges, before tax | (7,797) | (14,253) | (11,975) | (30,191)
Unrealized holding gains (losses) on cash flow hedges, tax effect | 2,220 | 4,061 | 3,412 | 8,604
Unrealized holding gains (losses) on cash flow hedges, net of tax | (5,577) | (10,192) | (8,563) | (21,587)
(Gain) loss reclassified from OCI to interest expense, net of tax | 2,290 | 370 | 6,232 | (697)
Amounts reclassified from AOCI, tax effect | (652) | (104) | (1,776) | 199
Amounts reclassified from AOCI, net of tax | 1,638 | 266 | 4,456 | (498)
Accumulated other comprehensive income (loss) ending balance period, before tax | (35,093) | (31,846) | (35,093) | (31,846)
Accumulated other comprehensive income (loss) ending balance period, tax effect | 10,001 | 9,076 | 10,001 | 9,076
Ending balance, net of tax | $ (25,092) | $ (22,770) | $ (25,092) | $ (22,770)

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