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Other Comprehensive Income (Loss) - Summary of Transfer of AFS Securities to HTM (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 Gain (Loss) on Securities Transferred from Available-for-Sale to Held-to-Maturity
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance				$ (182)				$ (197)	(182)	(197)	(174)
Amortization of unrealized losses									62	19	(29)
Related deferred taxes									(13)	(4)	6
Other comprehensive gain (loss)									49	15	(23)
Ending balance	$ (133)				$ (182)				$ (133)	$ (182)	$ (197)

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