Other Comprehensive Income (Loss) - Summary of the Tax Effects (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income, before tax	$ (684)	$ (590)	$ 2,743	$ 4,252
Other Comprehensive Income (Loss), Tax	(240)	(206)	960	1,488
Unrealized gains and losses on securities available-for-sale:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Change in unrealized gains during period	(335)	(645)	3,224	4,217
Other Comprehensive Income (Loss) before Reclassifications, Tax	(118)	(225)	1,128	1,476
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(217)	(420)	2,096	2,741
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	338	0	347	20
Reclassification from AOCI, Current Period, Tax	119	0	121	7
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	219	0	226	13
Gains on derivative instruments:
Accumulated Other Comprehensive Income (Loss) [Line Items]
Change in unrealized gains during period	(7)	55	(130)	55
Other Comprehensive Income (Loss) before Reclassifications, Tax	(2)	19	(46)	19
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(5)	36	(84)	36
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(4)	(4)	(4)	0
Reclassification from AOCI, Current Period, Tax	1	1	1	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(3)	(3)	(3)	0
Total other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income, before tax	(684)	(594)	2,743	4,252
Other Comprehensive Income (Loss), Tax	(240)	(207)	960	1,488
Other Comprehensive Income (Loss), Net of Tax	$ (444)	$ (387)	$ 1,783	$ 2,764