Other Comprehensive Loss - Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of securities, net	$ 373	$ 0
Tax expense	0	(34)
Interest expense	2,062	1,627
Net of tax	(5,830)	360
Unrealized gains and losses on securities available-for-sale: | Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of securities, net	373	0
Tax expense	0	0
Net of tax	373	0
Gains on derivative instruments: | Interest Rate Contract | Reclassifications Out of Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax expense	0	8
Interest expense	(262)	(40)
Net of tax	$ (262)	$ (32)