Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Securities gains, net	$ 105	$ (17)	$ 575	$ 393
Income taxes	(2,321)	(1,465)	(3,487)	(4,270)
Net income (loss)	8,692	5,785	13,465	17,577
Reclassifications	80	57	188	63
Realized gains on calls of securities
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Change in accounting for late charges					$ (650)
Reclassifications	80	57	188	63
Amount Reclassified from AOCI
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Net income (loss)	80		188
Change in accounting for late charges					$ 650
Reclassifications				713
Amount Reclassified from AOCI | Realized gains on calls of securities
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Securities gains, net	102	73	242	81
Income taxes	$ (22)	(16)	$ (54)	(18)
Net income (loss)		$ 57		$ 63