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Other Comprehensive Income (Loss) - Summary of Unrealized Gains and Losses on Available-for-Sale Securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance | $ 219,440 | $ 216,584 | $ 215,257 | $ 212,508 | $ 208,489 | $ 204,593 | $ 197,787 | $ 191,542 | $ 212,508 | $ 191,542 | $ 181,321
Reclassification adjustment for effect of enacted tax law changes |  |  |  |  |  |  |  |  |  |  | 0
Other comprehensive gain (loss) | 367 | (1,186) | (2,176) | (629) | 327 | 597 | 3,395 | 3,050 | (3,624) | 7,369 | (2,095)
Ending balance | 223,726 | $ 219,440 | $ 216,584 | 215,257 | 212,508 | $ 208,489 | $ 204,593 | 197,787 | 223,726 | 212,508 | 191,542
Accumulated Net Unrealized Investment Gain (Loss) |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  |  |  | $ 3,657 |  |  |  | $ (5,051) | 3,657 | (5,051) | (2,901)
Unrealized gains (losses) during the period |  |  |  |  |  |  |  |  | 2,866 | 11,247 | (2,585)
Realized gains during the period |  |  |  |  |  |  |  |  | (1,155) | (224) | (137)
Related deferred taxes |  |  |  |  |  |  |  |  | (359) | (2,315) | 572
Other comprehensive gain (loss) |  |  |  |  |  |  |  |  | 1,352 | 8,708 | (2,150)
Ending balance | $ 5,009 |  |  |  | $ 3,657 |  |  |  | $ 5,009 | $ 3,657 | $ (5,051)

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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 830 -SubTopic 30 -Section 45 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 Reference 2: 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 3: 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 4: 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 + Details
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