Accumulated Other Comprehensive Income (Loss) - Summary of Significant Amounts Reclassified out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]
Net (gain) loss on sale of securities	$ 12
Interest expense - Federal Home Loan Bank advances	(831)	$ (489)
Income tax benefit (expense)	(1,346)	(483)
Net income	4,780	3,195
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	(110)	(108)
Interest expense - Federal Home Loan Bank advances	(87)	(144)
Income tax benefit (expense)	9	24
Net income	(188)	(228)
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	12
Income tax benefit (expense)	(3)
Net income	$ 9
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		(14)
Income tax benefit (expense)		4
Net income		$ (10)