Other Comprehensive Income - Summary of the Tax Effects (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other comprehensive income (loss): Securities available-for-sale: Before Tax Amount
Change in unrealized gains during period	$ 2,739	$ 2,060	$ 3,559	$ 4,862
Reclassification adjustment for gains included in net income	(3)	(20)	(9)	(20)
Other comprehensive income (loss): Securities available-for-sale: Tax Effect
Change in unrealized gains during period	(959)	(721)	(1,246)	(1,701)
Reclassification adjustment for gains included in net income	1	7	3	7
Other comprehensive income (loss): Securities available-for-sale: Net of Tax Amount
Change in unrealized gains during period	1,780	1,339	2,313	3,161
Reclassification adjustment for gains included in net income	(2)	(13)	(6)	(13)
Other comprehensive income (loss): Derivatives qualifying as hedges: Before Tax
Change in fair value of derivative instruments designated as cash flow hedges	(136)	0	(123)	0
Other Comprehensive Income (loss): Derivatives qualifying as hedges: Tax Effect
Change in fair value of derivative instruments designated as cash flow hedges	48	0	43	0
Other Comprehensive Income (loss): Derivatives qualifying as hedges: Net of Tax Amount
Change in fair value of derivative instruments designated as cash flow hedges	(88)	0	(80)	0
Total other comprehensive income, before tax	2,600	2,040	3,427	4,842
Total other comprehensive income, tax effect	(910)	(714)	(1,200)	(1,694)
Total other comprehensive income, net of tax	$ 1,690	$ 1,326	$ 2,227	$ 3,148