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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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period			$ 223,726	$ 212,508
Other comprehensive loss	$ (1,257)	$ (1,186)	(2,207)	(3,991)
Balance at end of period	238,737	219,440	238,737	219,440
Accumulated Net Investment Gain (Loss) Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance at beginning of period	1,190	7,100	5,009	3,657
Unrealized gains (losses) arising during the period	(2,442)	(2,000)	(7,112)	3,537
Reclassification of net realized (gains) losses during the period	142	0	(22)	(1,179)
Related deferred taxes	483	420	1,498	(495)
Other comprehensive loss	(1,817)	(1,580)	(5,636)	1,863
Balance at end of period	$ (627)	$ 5,520	$ (627)	$ 5,520

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