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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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