Accumulated Other Comprehensive Income (Loss) - Summary of Significant Amounts Reclassified out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Net (gain) loss on sale of securities			$ (42)	$ (121)
Interest expense - Federal Home Loan Bank advances	$ 563	$ 97	1,083	280
Income tax expense (benefit)	1,516	1,042	141	2,998
Net of tax	(4,419)	(2,109)	(1,409)	(6,169)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Losses on Cash Flow Hedges
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Interest expense money market	109	38	322	113
Interest expense - Federal Home Loan Bank advances	168	50	267	148
Net of tax	277	88	589	261
Reclassification out of Accumulated Other Comprehensive Income | Unrealized (Gains) and Losses on Available for Sale Securities
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Net (gain) loss on sale of securities	(9)	4	(42)	(121)
Income tax expense (benefit)	3	(2)	16	46
Net of tax	(6)	2	(26)	(75)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Losses on Securities Transferred to Held to Maturity
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Interest income - securities	79	42	162	125
Income tax expense (benefit)	(30)	(16)	(62)	(48)
Net of tax	$ 49	$ 26	$ 100	$ 77