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Supplemental Comprehensive Income Disclosures | 12 Months Ended
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Dec. 31, 2020
Supplemental Comprehensive Income Disclosures [Abstract] |
Supplemental Comprehensive Income Disclosures | Supplemental Comprehensive Income Disclosures The following table identifies the related tax effects allocated to each component of other comprehensive income in the Consolidated Statements of Comprehensive Income as of December 31. Reclassification adjustments related to securities available for sale are included in the “Net securities gains” line in the Consolidated Statements of Income and reclassification adjustments related to losses on derivatives are included in the "Other operating expenses" line in the Consolidated Statements of Income.
| 2020 |  | 2019 |  | 2018
| Pretax Amount |  | Tax (Expense) Benefit |  | Net of Tax Amount |  | Pretax Amount |  | Tax (Expense) Benefit |  | Net of Tax Amount |  | Pretax Amount |  | Tax (Expense) Benefit |  | Net of Tax Amount
| (dollars in thousands)
Unrealized gains (losses) on securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized holding gains on securities arising during the period | $ | 19,981 |  |  | $ | (4,196) |  |  | $ | 15,785 |  |  | $ | 20,625 |  |  | $ | (4,331) |  |  | $ | 16,294 |  |  | $ | 2,783 |  |  | $ | (585) |  |  | $ | 2,198 |
Reclassification adjustment for gains on securities included in net income | (70) |  |  | 15 |  |  | (55) |  |  | (22) |  |  | 5 |  |  | (17) |  |  | (8,102) |  |  | 1,701 |  |  | (6,401) |
Total unrealized gains (losses) on securities | 19,911 |  |  | (4,181) |  |  | 15,730 |  |  | 20,603 |  |  | (4,326) |  |  | 16,277 |  |  | (5,319) |  |  | 1,116 |  |  | (4,203) |
Unrealized gains (losses) on derivatives: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized holding (losses) gains on derivatives arising during the period | (4,467) |  |  | 938 |  |  | (3,529) |  |  | 935 |  |  | (196) |  |  | 739 |  |  | 326 |  |  | (68) |  |  | 258 |
Reclassification adjustment for losses on derivatives included in net income | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 10 |  |  | (3) |  |  | 7 |
Total unrealized (losses) gains on derivatives | (4,467) |  |  | 938 |  |  | (3,529) |  |  | 935 |  |  | (196) |  |  | 739 |  |  | 336 |  |  | (71) |  |  | 265 |
Unrealized (losses) gains for postretirement obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost | (537) |  |  | 113 |  |  | (424) |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net (loss) gain | (155) |  |  | 32 |  |  | (123) |  |  | (121) |  |  | 25 |  |  | (96) |  |  | 144 |  |  | (30) |  |  | 114 |
Total unrealized (losses) gains for postretirement obligations | (692) |  |  | 145 |  |  | (547) |  |  | (121) |  |  | 25 |  |  | (96) |  |  | 144 |  |  | (30) |  |  | 114 |
Total other comprehensive income (loss) | $ | 14,752 |  |  | $ | (3,098) |  |  | $ | 11,654 |  |  | $ | 21,417 |  |  | $ | (4,497) |  |  | $ | 16,920 |  |  | $ | (4,839) |  |  | $ | 1,015 |  |  | $ | (3,824) |
The following table details the change in components of OCI for the year-ended December 31:
| 2020
| Securities Available for Sale |  | Derivatives |  | Post-Retirement Obligation |  | Accumulated Other Comprehensive Income
| (dollars in thousands)
Balance at December 31 | $ | 4,580 |  |  | $ | 634 |  |  | $ | 365 |  |  | $ | 5,579 |
Other comprehensive income before reclassification adjustment | 15,785 |  |  | (3,529) |  |  |  |  | 12,256 |
Amounts reclassified from accumulated other comprehensive income (loss) | (55) |  |  | — |  |  |  |  | (55) |
Prior service cost |  |  |  |  | (424) |  |  | (424) |
Net gain |  |  |  |  | (123) |  |  | (123) |
Net other comprehensive income during the period | 15,730 |  |  | (3,529) |  |  | (547) |  |  | 11,654 |
Balance at December 31 | $ | 20,310 |  |  | $ | (2,895) |  |  | $ | (182) |  |  | $ | 17,233 |
| 2019
| Securities Available for Sale |  | Derivatives |  | Post-Retirement Obligation |  | Accumulated Other Comprehensive Income
| (dollars in thousands)
Balance at January 1 | $ | (11,697) |  |  | $ | (105) |  |  | $ | 461 |  |  | $ | (11,341) |
Other comprehensive income before reclassification adjustment | 16,294 |  |  | 739 |  |  |  |  | 17,033 |
Amounts reclassified from accumulated other comprehensive income (loss) | (17) |  |  | — |  |  |  |  | (17) |
Net gain |  |  |  |  | (96) |  |  | (96) |
Net other comprehensive income during the period | 16,277 |  |  | 739 |  |  | (96) |  |  | 16,920 |
Balance at December 31 | $ | 4,580 |  |  | $ | 634 |  |  | $ | 365 |  |  | $ | 5,579 |
| 2018
| Securities Available for Sale |  | Derivatives |  | Post-Retirement Obligation |  | Accumulated Other Comprehensive Income
| (dollars in thousands)
Balance at January 1 | $ | (6,166) |  |  | $ | (306) |  |  | $ | 299 |  |  | $ | (6,173) |
Cumulative effect of adoption of ASU 2018-02 | (1,328) |  |  | (64) |  |  | 48 |  |  | (1,344) |
Balance at January 1 | (7,494) |  |  | (370) |  |  | 347 |  |  | (7,517) |
Other comprehensive income before reclassification adjustment | 2,198 |  |  | 258 |  |  |  |  | 2,456 |
Amounts reclassified from accumulated other comprehensive income (loss) | (6,401) |  |  | 7 |  |  |  |  | (6,394) |
Net gain |  |  |  |  | 114 |  |  | 114 |
Net other comprehensive income during the period | (4,203) |  |  | 265 |  |  | 114 |  |  | (3,824) |
Balance at December 31 | $ | (11,697) |  |  | $ | (105) |  |  | $ | 461 |  |  | $ | (11,341) |

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- Definition Supplemental Comprehensive Income Disclosures [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 + Details
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