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Accumulated Other Comprehensive Income (Loss) ("AOCI") | 12 Months Ended
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Dec. 31, 2020
Accumulated Other Comprehensive Income ("AOCI") |
Accumulated Other Comprehensive Income ("AOCI") | 2) Accumulated Other Comprehensive Income (“AOCI”) The following table reflects the changes in AOCI by component for the periods indicated: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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.
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | 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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- 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 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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