Accumulated Other Comprehensive Loss ("AOCL"), Summary of Changes (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]
Balance at beginning of period			$ 248,980	$ 251,092
Cumulative effect of change in accounting	$ 352	$ 1,247	352	1,247
Balance at beginning of period, as adjusted			249,332	252,339
Other comprehensive income before reclassifications	157	278	5,229	3,215
Amounts reclassified from AOCL	(2)	(10)	(78)	(194)
Other comprehensive income	155	268	5,151	3,021
Balance at end of period	267,710	250,902	267,710	250,902
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(3,812)	(3,283)	(9,108)	(6,036)
Cumulative effect of change in accounting	300		300
Balance at beginning of period, as adjusted			(8,808)
Balance at end of period	(3,657)	(3,015)	(3,657)	(3,015)
Unrealized Gains (Losses) on Securities Available For Sale [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	1,986	2,515	(3,310)	(238)
Cumulative effect of change in accounting	300		300
Balance at beginning of period, as adjusted			(3,010)
Other comprehensive income before reclassifications	95	278	5,167	3,215
Amounts reclassified from AOCL	(5)	(10)	(81)	(194)
Other comprehensive income	90	268	5,086	3,021
Balance at end of period	2,076	2,783	2,076	2,783
Disproportionate Tax Effects from Securities Available for Sale [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(5,798)	(5,798)	(5,798)	(5,798)
Cumulative effect of change in accounting	0		0
Balance at beginning of period, as adjusted			(5,798)
Other comprehensive income before reclassifications	0	0	0	0
Amounts reclassified from AOCL	0	0	0	0
Other comprehensive income	0	0	0	0
Balance at end of period	(5,798)	(5,798)	(5,798)	(5,798)
Unrealized Gains on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	0	0	0	0
Cumulative effect of change in accounting	0		0
Balance at beginning of period, as adjusted			0
Other comprehensive income before reclassifications	62	0	62	0
Amounts reclassified from AOCL	3	0	3	0
Other comprehensive income	65	0	65	0
Balance at end of period	$ 65	$ 0	$ 65	$ 0