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Other Comprehensive Income (Loss) - Summary of Unrealized Gains and Losses on Postretirement Benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year | $ 238,737 | $ 234,155 | $ 228,184 | $ 223,726 | $ 219,440 | $ 216,584 | $ 215,257 | $ 212,508 | $ 223,726 | $ 212,508 | $ 191,542
Other comprehensive gain (loss) | 535 | (1,257) | 362 | (1,312) | 367 | (1,186) | (2,176) | (629) | (1,672) | (3,624) | 7,369
Balance at end of year | 245,657 | $ 238,737 | $ 234,155 | 228,184 | 223,726 | $ 219,440 | $ 216,584 | 215,257 | 245,657 | 223,726 | 212,508
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | $ 28 |  |  |  | $ 24 | 28 | 24 | 37
Change in unamortized net actuarial gain (loss) |  |  |  |  |  |  |  |  | 98 | 5 | (16)
Related deferred taxes |  |  |  |  |  |  |  |  | (21) | (1) | 3
Other comprehensive gain (loss) |  |  |  |  |  |  |  |  | 77 | 4 | (13)
Balance at end of year | $ 105 |  |  |  | $ 28 |  |  |  | $ 105 | $ 28 | $ 24

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124431353&loc=SL124442411-227067 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32136-110900 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=124431353&loc=SL124442407-227067 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -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 6: 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=124509347&loc=SL7669686-108580 + Details
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