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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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 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)	$ (2,176)	$ 3,395	(2,805)	6,445
Ending balance	216,584	204,593	216,584	204,593
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	(174)	(194)	(182)	(197)
Amortization of net unrealized gains	35	5	45	9
Related deferred taxes	(7)	(1)	(9)	(2)
Other comprehensive gain (loss)	28	4	36	7
Ending balance	$ (146)	$ (190)	$ (146)	$ (190)

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