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Other Comprehensive Income (Loss) - Reclassification of Available-for-Sale Securities to Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Reclassification of Available-for-Sale Securities to Held-to-maturity Roll Forward [Roll Forward]
Beginning balance			$ 212,508	$ 191,542
Other comprehensive gain (loss)	$ (1,186)	$ 597	(3,991)	7,042
Ending balance	219,440	208,489	219,440	208,489
Accumulated Net Gain (Loss) on Securities Transferred from Available-for-Sale to Held-to-Maturity
Reclassification of Available-for-Sale Securities to Held-to-maturity Roll Forward [Roll Forward]
Beginning balance	(146)	(190)	(182)	(197)
Amortization of net unrealized gains	9	1	54	10
Related deferred taxes	(2)	0	(11)	(2)
Other comprehensive gain (loss)	7	1	43	8
Ending balance	$ (139)	$ (189)	$ (139)	$ (189)

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