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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Before-Tax Amount |  |  |
Other Comprehensive Income, Net unrealized losses | $ (202,310) | $ (31,619) | $ 15,222
Tax (Expense) Benefit |  |  |
Other Comprehensive Income, Net unrealized losses | 49,571 | 7,743 | (3,732)
Net of Tax |  |  |
Other comprehensive (loss) income | (152,739) | (23,876) | 11,490
Available-for-sale securities |  |  |
Before-Tax Amount |  |  |
Other comprehensive gain (loss), before reclassifications | (229,463) | (46,301) | 22,381
Reclassification adjustment | 11,916 | (275) | (430)
Other Comprehensive Income, Net unrealized losses | (217,547) | (46,576) | 21,951
Tax (Expense) Benefit |  |  |
Other comprehensive gain (loss), before reclassifications | 56,223 | 11,340 | (5,487)
Reclassification adjustment | (2,919) | 67 | 106
Other Comprehensive Income, Net unrealized losses | 53,304 | 11,407 | (5,381)
Net of Tax |  |  |
Other comprehensive gain (loss), before reclassifications | (173,240) | (34,961) | 16,894
Reclassification adjustment | 8,997 | (208) | (324)
Other comprehensive (loss) income | (164,243) | (35,169) | 16,570
Net retirement plan actuarial (loss) gain |  |  |
Before-Tax Amount |  |  |
Other comprehensive gain (loss), before reclassifications | 12,761 | 11,785 | (9,309)
Reclassification adjustment | 2,260 | 2,951 | 2,366
Tax (Expense) Benefit |  |  |
Other comprehensive gain (loss), before reclassifications | (3,127) | (2,887) | 2,281
Reclassification adjustment | (554) | (723) | (580)
Net of Tax |  |  |
Other comprehensive gain (loss), before reclassifications | 9,634 | 8,898 | (7,028)
Reclassification adjustment | 1,706 | 2,228 | 1,786
Net retirement plan prior service credit |  |  |
Before-Tax Amount |  |  |
Reclassification adjustment | 216 | 221 | 214
Tax (Expense) Benefit |  |  |
Reclassification adjustment | (52) | (54) | (52)
Net of Tax |  |  |
Reclassification adjustment | 164 | 167 | 162
Employee benefit plans |  |  |
Before-Tax Amount |  |  |
Other Comprehensive Income, Net unrealized losses | 15,237 | 14,957 | (6,729)
Tax (Expense) Benefit |  |  |
Other Comprehensive Income, Net unrealized losses | (3,733) | (3,664) | 1,649
Net of Tax |  |  |
Other comprehensive (loss) income | $ 11,504 | $ 11,293 | $ (5,080)

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