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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Schedule of AOCI | The following table summarizes the changes within each classification of AOCI, net of tax:
(dollars in thousands) | Unrealized Gains and Losses on Available- for-Sale Debt Securities |  | Unrealized Gains and Losses on Held-to- Maturity Securities |  | Gains and Losses on Cash Flow Hedges |  | Defined Benefit Pension Plans |  | Total
Year Ended December 31, 2020 |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | 56,131 |  |  | $ | — |  |  | $ | 240 |  |  | $ | (164) |  |  | $ | 56,207 |
Other comprehensive income (loss) before reclassifications | 97,596 |  |  | — |  |  | 6,230 |  |  | — |  |  | 103,826 |
Amounts reclassified from AOCI to income (1) | (8,392) |  |  | — |  |  | (3,886) |  |  | 16 |  |  | (12,262) |
Balance at end of period | $ | 145,335 |  |  | $ | — |  |  | $ | 2,584 |  |  | $ | (148) |  |  | $ | 147,771 |
Year Ended December 31, 2019 |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (37,348) |  |  | $ | (8,515) |  |  | $ | 1,099 |  |  | $ | (186) |  |  | $ | (44,950) |
Other comprehensive income (loss) before reclassifications | 94,964 |  |  | 6,419 |  |  | (410) |  |  | — |  |  | 100,973 |
Amounts reclassified from AOCI (1) | (1,485) |  |  | 2,096 |  |  | (449) |  |  | 22 |  |  | 184 |
Balance at end of period | $ | 56,131 |  |  | $ | — |  |  | $ | 240 |  |  | $ | (164) |  |  | $ | 56,207 |
Year Ended December 31, 2018 |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (35,557) |  |  | $ | (12,107) |  |  | $ | (2,337) |  |  | $ | (271) |  |  | $ | (50,272) |
Amount reclassified from AOCI to retained earnings for cumulative effect of change in accounting principle | — |  |  | — |  |  | (52) |  |  | — |  |  | (52) |
Amounts reclassified from AOCI to retained earnings related to the Tax Cuts and Jobs Act of 2017 | (7,583) |  |  | (2,600) |  |  | (509) |  |  | (59) |  |  | (10,751) |
Other comprehensive income (loss) before reclassifications | 7,454 |  |  | 4,514 |  |  | 3,884 |  |  | — |  |  | 15,852 |
Amounts reclassified from AOCI (1) | (1,662) |  |  | 1,678 |  |  | 113 |  |  | 144 |  |  | 273 |
Balance at end of period | $ | (37,348) |  |  | $ | (8,515) |  |  | $ | 1,099 |  |  | $ | (186) |  |  | $ | (44,950) |
(1)See table below for details about reclassifications to income.
Reclassifications out of Accumulated Other Comprehensive Income (Loss) | The following table summarizes the significant amounts reclassified out of each component of AOCI:
Details about AOCI Components | Amount Reclassified from AOCI |  | Affected Line Item in the Statement of Income
| Years Ended December 31, |  |
(dollars in thousands) | 2020 |  | 2019 |  | 2018 |  |
Unrealized gains and losses on available-for-sale debt securities | $ | 10,767 |  |  | $ | 1,923 |  |  | $ | 2,060 |  |  | Debt securities gains (losses), net
| (2,375) |  |  | (438) |  |  | (398) |  |  | Income tax (expense) benefit
| $ | 8,392 |  |  | $ | 1,485 |  |  | $ | 1,662 |  |  | Net income
Unrealized gains and losses on held-to-maturity securities | $ | — |  |  | $ | (2,812) |  |  | $ | (2,181) |  |  | Interest income (expense)
| — |  |  | 716 |  |  | 503 |  |  | Income tax (expense) benefit
| $ | — |  |  | $ | (2,096) |  |  | $ | (1,678) |  |  | Net income
Gains and losses on cash flow hedges Interest rate contracts | $ | 5,153 |  |  | $ | 596 |  |  | $ | (150) |  |  | Interest income (expense)
| (1,267) |  |  | (147) |  |  | 37 |  |  | Income tax (expense) benefit
| $ | 3,886 |  |  | $ | 449 |  |  | $ | (113) |  |  | Net income
Amortization of defined benefit pension items |  |  |  |  |  |  |
Actuarial gains (losses) | $ | (21) |  |  | $ | (30) |  |  | $ | (191) |  |  | Salaries and employee benefits
| 5 |  |  | 8 |  |  | 47 |  |  | Income tax (expense) benefit
| $ | (16) |  |  | $ | (22) |  |  | $ | (144) |  |  | Net income
Total reclassifications for the period | $ | 12,262 |  |  | $ | (184) |  |  | $ | (273) |  |  | Net income

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