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Accumulated Other Comprehensive Income ("AOCI") (Tables) | 12 Months Ended
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Dec. 31, 2020
Accumulated Other Comprehensive Income ("AOCI") |
Schedule of changes in AOCI by component | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31, 2020 and 2019
​ |  | ​ |  | Unamortized |  | ​ |  | ​
​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​
​ | ​ | Unrealized | ​ | Gain on | ​ | ​ | ​ | ​
​ | ​ | Gains (Losses) on | ​ | Available- | ​ | ​ | ​ | ​
​ | ​ | Available- | ​ | for-Sale | ​ | Defined | ​ | ​
​ | ​ | for-Sale | ​ | Securities | ​ | Benefit | ​ | ​
​ | ​ | Securities | ​ | Reclassified | ​ | Pension | ​ | ​
​ | ​ | and I/O | ​ | to Held-to- | ​ | Plan | ​ | ​
​ | ​ | Strips | ​ | Maturity | ​ | Items(1) | ​ | Total
​ | ​ | (Dollars in thousands)
Beginning balance January 1, 2020, net of taxes | ​ | $ | 1,602 | ​ | $ | 298 | ​ | $ | (11,678) | ​ | $ | (9,778)
Other comprehensive income (loss) before reclassification, | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
net of taxes | ​ |  | 2,522 | ​ |  | — | ​ |  | (3,459) | ​ |  | (937)
Amounts reclassified from other comprehensive income (loss), | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
net of taxes | ​ |  | (195) | ​ |  | (37) | ​ |  | 230 | ​ |  | (2)
Net current period other comprehensive income (loss), | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
net of taxes | ​ |  | 2,327 | ​ |  | (37) | ​ |  | (3,229) | ​ |  | (939)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance December 31, 2020, net of taxes | ​ | $ | 3,929 | ​ | $ | 261 | ​ | $ | (14,907) | ​ | $ | (10,717)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Beginning balance January 1, 2019, net of taxes | ​ | $ | (5,007) | ​ | $ | 344 | ​ | $ | (7,718) | ​ | $ | (12,381)
Other comprehensive income (loss) before reclassification, | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
net of taxes | ​ |  | 7,075 | ​ |  | — | ​ |  | (4,022) | ​ |  | 3,053
Amounts reclassified from other comprehensive income (loss), | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
net of taxes | ​ |  | (466) | ​ |  | (46) | ​ |  | 62 | ​ |  | (450)
Net current period other comprehensive income (loss), | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
net of taxes | ​ |  | 6,609 | ​ |  | (46) | ​ |  | (3,960) | ​ |  | 2,603
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Ending balance December 31, 2019, net of taxes | ​ | $ | 1,602 | ​ | $ | 298 | ​ | $ | (11,678) | ​ | $ | (9,778)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(1) | This AOCI component is included in the computation of net periodic benefit cost (see Note 14—Benefit Plans) and includes split-dollar life insurance benefit plan.
Schedule of reclassifications out of AOCI into net income |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Amounts Reclassified from | ​ | ​ |
​ | AOCI(1) | ​ | ​ |
​ | Year Ended | ​ | ​ | ​
​ | December 31, | ​ | Affected Line Item Where |
Details About AOCI Components | 2020 |  | 2019 |  | 2018 |  | Net Income is Presented |
​ | (Dollars in thousands) | ​ | ​ |
Unrealized gains on available-for-sale securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
and I/O strips | $ | 277 | ​ | $ | 661 | ​ | $ | 266 |  | Gain on sales of securities | ​
​ |  | (82) | ​ |  | (195) | ​ |  | (79) |  | Income tax expense | ​
​ |  | 195 | ​ |  | 466 | ​ |  | 187 |  | Net of tax | ​
Amortization of unrealized gain on securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
available-for-sale that were reclassified to securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
held-to-maturity |  | 52 | ​ |  | 65 | ​ |  | 44 |  | Interest income on taxable securities | ​
​ |  | (15) | ​ |  | (19) | ​ |  | (13) |  | Income tax expense | ​
​ |  | 37 | ​ |  | 46 | ​ |  | 31 |  | Net of tax | ​
Amortization of defined benefit pension plan items (1) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Prior transition obligation and actuarial losses (2) |  | 60 | ​ |  | 96 | ​ |  | 65 | ​ | ​ | ​
Actuarial losses (3) |  | (387) | ​ |  | (184) | ​ |  | (292) | ​ | ​ | ​
​ |  | (327) | ​ |  | (88) | ​ |  | (227) |  | Other noninterest expense | ​
​ |  | 97 | ​ |  | 26 | ​ |  | 67 |  | Income tax benefit | ​
​ |  | (230) | ​ |  | (62) | ​ |  | (160) |  | Net of tax | ​
Total reclassification from AOCI for the period | $ | 2 | ​ | $ | 450 | ​ | $ | 58 | ​ | ​ | ​
(1) | This AOCI component is included in the computation of net periodic benefit cost (see Note 14 — Benefit Plans).
(2) This is related to the split dollar life insurance benefit plan. (3) This is related to the supplemental executive retirement plan.

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