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Accumulated Other Comprehensive (Loss) Income (Tables) | 3 Months Ended
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Mar. 31, 2023
Equity [Abstract] |
Changes in other comprehensive income (loss) | The following table presents the components of other comprehensive income (loss):
| Before-Tax Amount |  | Tax Effect |  | Net of Tax Amount
Three months ended March 31, 2023 | (dollars in thousands)
Net unrealized income on securities | $ | 42,199 |  |  | $ | (9,558) |  |  | $ | 32,641 |
Reclassification adjustment for securities net change included in net income (1) | 23 |  |  | (5) |  |  | 18 |
Amortization of net unrealized gains on AFS securities transferred to HTM (2) | 1,910 |  |  | (433) |  |  | 1,477 |
Net unrealized holding losses arising during the period on interest rate derivatives used in cash flow hedges(3) | 12,535 |  |  | (17,748) |  |  | (5,213) |
Reclassification adjustment for net change realized in net income on interest rate derivatives used in cash flow hedges(3) | 7,157 |  |  | (1,621) |  |  | 5,536 |
Amortization of net unrecognized pension and postretirement items (4) | 32 |  |  | (7) |  |  | 25 |
Total Other Comprehensive Income | $ | 63,856 |  |  | $ | (29,372) |  |  | $ | 34,484 |
Three months ended March 31, 2022 |  |  |  |  |
Net unrealized losses on securities | $ | (199,068) |  |  | $ | 45,208 |  |  | $ | (153,860) |
Reclassification adjustment for securities net change included in net income (1) | 19 |  |  | (4) |  |  | 15 |
Amortization of net unrealized gains on AFS securities transferred to HTM (2) | 564 |  |  | (128) |  |  | 436 |
Net unrealized holding losses arising during the period on interest rate derivatives used in cash flow hedges | (40,563) |  |  | 9,187 |  |  | (31,376) |
Reclassification adjustment for net change realized in net income on interest rate derivatives used in cash flow hedges | (1,948) |  |  | 442 |  |  | (1,506) |
Amortization of net unrecognized pension and postretirement items (4) | 32 |  |  | (7) |  |  | 25 |
Total Other Comprehensive Loss | $ | (240,964) |  |  | $ | 54,698 |  |  | $ | (186,266) |
(1) Amounts reclassified out of AOCI. Before-tax amounts included in "Investment securities gains, net" on the Consolidated Statements of Income. See "Note 4 -Investment Securities," for additional details. (2) Amounts reclassified out of AOCI. Before-tax amounts included as a reduction to "Interest Income" on the Consolidated Statements of Income. (3) Tax effect includes reversal of swap deferred tax benefit upon termination. (4) Amounts reclassified out of AOCI. Before-tax amounts included in "Salaries and employee benefits" on the Consolidated Statements of Income. See "Note 12 - Employee Benefit Plans," for additional details.
Changes in each component of accumulated other comprehensive income (loss) | The following table presents changes in each component of accumulated other comprehensive income (loss), net of tax:
| Unrealized Gains (Losses) on Investment Securities |  | Net Unrealized Gain (Loss) on Interest Rate Derivatives used in Cash Flow Hedges |  |  |  | Unrecognized Pension and Postretirement Plan Income (Costs) |  | Total
| (dollars in thousands)
Three months ended March 31, 2023 |  |  |  |  |  |  |  |  |
Balance at December 31, 2022 | $ | (316,231) |  |  | $ | (61,776) |  |  |  |  | $ | (7,469) |  |  | $ | (385,476) |
OCI before reclassifications | 32,641 |  |  | — |  |  |  |  | — |  |  | 32,641 |
Amounts reclassified from AOCI | 18 |  |  | 323 |  |  |  |  | 25 |  |  | 366 |
Amortization of net unrealized losses on AFS securities transferred to HTM | 1,477 |  |  | — |  |  |  |  | — |  |  | 1,477 |
Balance at March 31, 2023 | $ | (282,095) |  |  | $ | (61,453) |  |  |  |  | $ | (7,444) |  |  | $ | (350,992) |
Three months ended March 31, 2022 |  |  |  |  |  |  |  |  |
Balance at December 31, 2021 | $ | 40,441 |  |  | $ | (4,817) |  |  |  |  | $ | (8,213) |  |  | $ | 27,411 |
OCI before reclassifications | (153,860) |  |  | — |  |  |  |  | — |  |  | (153,860) |
Amounts reclassified from AOCI | 15 |  |  | (32,882) |  |  |  |  | 25 |  |  | (32,842) |
Amortization of net unrealized losses on AFS securities transferred to HTM | 436 |  |  | — |  |  |  |  | — |  |  | 436 |
Balance at March 31, 2022 | $ | (112,968) |  |  | $ | (37,699) |  |  |  |  | $ | (8,188) |  |  | $ | (158,855) |

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