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Other Comprehensive Income (Loss) - Tax Effect Allocated to Each Component of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Before-Tax Amount |  |  |
Other Comprehensive Income, Net unrealized losses | $ (31,619) | $ 15,222 | $ 25,961
Tax (Expense) Benefit |  |  |
Other Comprehensive Income, Net unrealized losses | 7,743 | (3,732) | (6,360)
Net of Tax |  |  |
Unrealized gains on HTM securities transferred to AFS securities | 0 | 0 | 2,852
Other comprehensive (loss) income | (23,876) | 11,490 | 19,601
Available-for-sale securities |  |  |
Before-Tax Amount |  |  |
Other comprehensive gain (loss), before reclassifications | (46,301) | 22,381 | 33,431
Unrealized gains on HTM securities transferred to AFS securities |  |  | 3,777
Reclassification adjustment | (275) | (430) | (616)
Other Comprehensive Income, Net unrealized losses | (46,576) | 21,951 | 36,592
Tax (Expense) Benefit |  |  |
Other comprehensive gain (loss), before reclassifications | 11,340 | (5,487) | (8,190)
Unrealized gains on HTM securities transferred to AFS securities |  |  | (925)
Reclassification adjustment | 67 | 106 | 151
Other Comprehensive Income, Net unrealized losses | 11,407 | (5,381) | (8,964)
Net of Tax |  |  |
Other comprehensive gain (loss), before reclassifications | (34,961) | 16,894 | 25,241
Unrealized gains on HTM securities transferred to AFS securities |  |  | 2,852
Reclassification adjustment | (208) | (324) | (465)
Other comprehensive (loss) income | (35,169) | 16,570 | 27,628
Net retirement plan actuarial (loss) gain |  |  |
Before-Tax Amount |  |  |
Other comprehensive gain (loss), before reclassifications | 11,785 | (9,309) | (10,122)
Reclassification adjustment | 2,951 | 2,366 | 1,677
Tax (Expense) Benefit |  |  |
Other comprehensive gain (loss), before reclassifications | (2,887) | 2,281 | 2,480
Reclassification adjustment | (723) | (580) | (411)
Net of Tax |  |  |
Other comprehensive gain (loss), before reclassifications | 8,898 | (7,028) | (7,642)
Reclassification adjustment | 2,228 | 1,786 | 1,266
Net actuarial gain due to curtailment |  |  |
Before-Tax Amount |  |  |
Other comprehensive gain (loss), before reclassifications |  |  | (399)
Tax (Expense) Benefit |  |  |
Other comprehensive gain (loss), before reclassifications |  |  | 97
Net of Tax |  |  |
Other comprehensive gain (loss), before reclassifications |  |  | (302)
Net retirement plan prior service credit |  |  |
Before-Tax Amount |  |  |
Other comprehensive gain (loss), before reclassifications |  |  | (1,819)
Reclassification adjustment | 221 | 214 | 32
Tax (Expense) Benefit |  |  |
Other comprehensive gain (loss), before reclassifications |  |  | 446
Reclassification adjustment | (54) | (52) | (8)
Net of Tax |  |  |
Other comprehensive gain (loss), before reclassifications |  |  | (1,373)
Reclassification adjustment | 167 | 162 | 24
Employee benefit plans |  |  |
Before-Tax Amount |  |  |
Other Comprehensive Income, Net unrealized losses | 14,957 | (6,729) | (10,631)
Tax (Expense) Benefit |  |  |
Other Comprehensive Income, Net unrealized losses | (3,664) | 1,649 | 2,604
Net of Tax |  |  |
Other comprehensive (loss) income | $ 11,293 | $ (5,080) | $ (8,027)

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