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Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Schedule of Comprehensive Income (Loss) | The following tables present a reconciliation of the changes in the components of other comprehensive income and loss for the periods indicated, including the amount of tax (expense) benefit allocated to each component:
|  | For The Year Ended December 31,
|  | 2020 |  | 2019 |  | 2018
(In thousands) |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount
AFS Debt Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized holding gain (loss) |  | $ | 33,198 |  |  | $ | (7,138) |  |  | $ | 26,060 |  |  | $ | 26,743 |  |  | $ | (5,750) |  |  | $ | 20,993 |  |  | $ | (10,846) |  |  | $ | 2,332 |  |  | $ | (8,514) |
Less: reclassification adjustment for net realized (loss) gain(1) |  | — |  |  | — |  |  | — |  |  | (105) |  |  | 22 |  |  | (83) |  |  | (663) |  |  | 142 |  |  | (521) |
Net unrealized gain (loss) |  | 33,198 |  |  | (7,138) |  |  | 26,060 |  |  | 26,848 |  |  | (5,772) |  |  | 21,076 |  |  | (10,183) |  |  | 2,190 |  |  | (7,993) |
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net increase (decrease) in fair value |  | 1,214 |  |  | (260) |  |  | 954 |  |  | (2,973) |  |  | 639 |  |  | (2,334) |  |  | 1,066 |  |  | (229) |  |  | 837 |
Less: reclassified AOCI gain (loss) into interest expense(2) |  | (1,603) |  |  | 345 |  |  | (1,258) |  |  | (707) |  |  | 151 |  |  | (556) |  |  | (831) |  |  | 179 |  |  | (652) |
Less: reclassified AOCI gain (loss) into interest income(3) |  | 1,006 |  |  | (216) |  |  | 790 |  |  | (214) |  |  | 47 |  |  | (167) |  |  | — |  |  | — |  |  | — |
Net increase (decrease) in fair value |  | 1,811 |  |  | (389) |  |  | 1,422 |  |  | (2,052) |  |  | 441 |  |  | (1,611) |  |  | 1,897 |  |  | (408) |  |  | 1,489 |
Postretirement Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial (loss) gain |  | (1,282) |  |  | 277 |  |  | (1,005) |  |  | (1,918) |  |  | 412 |  |  | (1,506) |  |  | 1,743 |  |  | (375) |  |  | 1,368 |
Less: Amortization of net actuarial loss(4) |  | (701) |  |  | 151 |  |  | (550) |  |  | (271) |  |  | 59 |  |  | (212) |  |  | (613) |  |  | 131 |  |  | (482) |
Less: Amortization of net prior service credits(4) |  | 24 |  |  | (5) |  |  | 19 |  |  | 24 |  |  | (5) |  |  | 19 |  |  | 24 |  |  | (5) |  |  | 19 |
Net loss on postretirement plans |  | (605) |  |  | 131 |  |  | (474) |  |  | (1,671) |  |  | 358 |  |  | (1,313) |  |  | 2,332 |  |  | (501) |  |  | 1,831 |
Other comprehensive income |  | $ | 34,404 |  |  | $ | (7,396) |  |  | $ | 27,008 |  |  | $ | 23,125 |  |  | $ | (4,973) |  |  | $ | 18,152 |  |  | $ | (5,954) |  |  | $ | 1,281 |  |  | $ | (4,673) |
(1) Reclassified into net (loss) gain on sale of securities on the consolidated statements of income. (2) Reclassified into interest on deposits, borrowings and subordinated debentures on the consolidated statements of income. (3) Reclassified into interest and fees on loans on the consolidated statements of income. (4) Reclassified into salaries and employee benefits and other expenses on the consolidated statements of income. Refer to Note 18 of the consolidated financial statements for further details.
Schedule of Accumulated Other Comprehensive Income (Loss) | The following table presents the changes in each component of AOCI for the periods indicated:
(In thousands) |  | Net Unrealized (Losses) Gains on AFS Debt Securities(1) |  | Net Unrealized (Losses) Gains on Cash Flow Hedges(1) |  | Defined Benefit Postretirement Plans(1) |  | AOCI(1)
Balance at December 31, 2017 |  | $ | (10,300) |  |  | $ | (5,926) |  |  | $ | (3,988) |  |  | $ | (20,214) |
Other comprehensive (loss) gain before reclassifications |  | (8,514) |  |  | 837 |  |  | 1,368 |  |  | (6,309) |
Less: Amounts reclassified from AOCI |  | (521) |  |  | (652) |  |  | (463) |  |  | (1,636) |
Other comprehensive (loss) income |  | (7,993) |  |  | 1,489 |  |  | 1,831 |  |  | (4,673) |
Net amount reclassified to AOCI related to adoption of ASU 2016-01 and ASU 2017-12 |  | 467 |  |  | — |  |  | — |  |  | 467 |
Balance at December 31, 2018 |  | (17,826) |  |  | (4,437) |  |  | (2,157) |  |  | (24,420) |
Other comprehensive income (loss) before reclassifications |  | 20,993 |  |  | (2,334) |  |  | (1,506) |  |  | 17,153 |
Less: Amounts reclassified from AOCI |  | (83) |  |  | (723) |  |  | (193) |  |  | (999) |
Other comprehensive income (loss) |  | 21,076 |  |  | (1,611) |  |  | (1,313) |  |  | 18,152 |
Balance at December 31, 2019 |  | 3,250 |  |  | (6,048) |  |  | (3,470) |  |  | (6,268) |
Other comprehensive income (loss) before reclassifications |  | 26,060 |  |  | 954 |  |  | (1,005) |  |  | 26,009 |
Less: Amounts reclassified from AOCI |  | — |  |  | (468) |  |  | (531) |  |  | (999) |
Other comprehensive income (loss) |  | 26,060 |  |  | 1,422 |  |  | (474) |  |  | 27,008 |
Balance at December 31, 2020 |  | $ | 29,310 |  |  | $ | (4,626) |  |  | $ | (3,944) |  |  | $ | 20,740 |
(1) All amounts are net of tax.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e526-108580 + Details
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