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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 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 June 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 | $ | (320,496) |  |  | $ | 91,354 |  |  | $ | (229,142) |  |  | $ | (184,233) |  |  | $ | 52,515 |  |  | $ | (131,718) |
Unrealized holding gains (losses) on debt securities available for sale, net | (16,597) |  |  | 4,731 |  |  | (11,866) |  |  | (95,288) |  |  | 27,162 |  |  | (68,126) |
Unrecognized losses on debt securities transferred to held to maturity from available for sale | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Amounts reclassified from AOCI, net | 178 |  |  | (51) |  |  | 127 |  |  | 4 |  |  | (1) |  |  | 3 |
Amortization of unrecognized losses on securities transferred to held to maturity | 1,556 |  |  | (443) |  |  | 1,113 |  |  | 2,207 |  |  | (629) |  |  | 1,578 |
Balance at end of period | $ | (335,359) |  |  | $ | 95,591 |  |  | $ | (239,768) |  |  | $ | (277,310) |  |  | $ | 79,047 |  |  | $ | (198,263) |
Unrealized gains (losses) on cash flow hedges |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (23,277) |  |  | $ | 6,635 |  |  | $ | (16,642) |  |  | $ | (8,234) |  |  | $ | 2,347 |  |  | $ | (5,887) |
Unrealized holding gains (losses) on cash flow hedges, net | (8,442) |  |  | 2,406 |  |  | (6,036) |  |  | (9,162) |  |  | 2,612 |  |  | (6,550) |
Amounts reclassified from AOCI, net | 2,133 |  |  | (608) |  |  | 1,525 |  |  | (567) |  |  | 160 |  |  | (407) |
Balance at end of period | $ | (29,586) |  |  | $ | 8,433 |  |  | $ | (21,153) |  |  | $ | (17,963) |  |  | $ | 5,119 |  |  | $ | (12,844) |
Total AOCI | $ | (364,945) |  |  | $ | 104,024 |  |  | $ | (260,921) |  |  | $ | (295,273) |  |  | $ | 84,166 |  |  | $ | (211,107) |
| Six Months Ended June 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 | 14,096 |  |  | (4,018) |  |  | 10,078 |  |  | (199,570) |  |  | 56,888 |  |  | (142,682) |
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 | 174 |  |  | (50) |  |  | 124 |  |  | (102) |  |  | 29 |  |  | (73) |
Amortization of unrecognized losses on securities transferred to held to maturity | 3,249 |  |  | (926) |  |  | 2,323 |  |  | 3,090 |  |  | (881) |  |  | 2,209 |
Balance at end of period | $ | (335,359) |  |  | $ | 95,591 |  |  | $ | (239,768) |  |  | $ | (277,310) |  |  | $ | 79,047 |  |  | $ | (198,263) |
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 | (4,178) |  |  | 1,192 |  |  | (2,986) |  |  | (15,938) |  |  | 4,543 |  |  | (11,395) |
Amounts reclassified from AOCI, net | 3,942 |  |  | (1,124) |  |  | 2,818 |  |  | (1,067) |  |  | 303 |  |  | (764) |
Balance at end of period | $ | (29,586) |  |  | $ | 8,433 |  |  | $ | (21,153) |  |  | $ | (17,963) |  |  | $ | 5,119 |  |  | $ | (12,844) |
Total AOCI | $ | (364,945) |  |  | $ | 104,024 |  |  | $ | (260,921) |  |  | $ | (295,273) |  |  | $ | 84,166 |  |  | $ | (211,107) |

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