Accumulated Other Comprehensive Loss ("AOCL"), Summary of Changes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	$ 264,933	$ 248,980
Cumulative effect of change in accounting	0	352
Balance at beginning of period, as adjusted	264,933	249,332
Other comprehensive income (loss) before reclassifications	(2,513)	2,341
Amounts reclassified from AOCL	10	(69)
Other comprehensive income (loss)	(2,503)	2,272
Balance at end of period	267,917	255,475
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(5,999)	(9,108)
Cumulative effect of change in accounting		300
Balance at beginning of period, as adjusted		(8,808)
Balance at end of period	(8,502)	(6,536)
Unrealized Gains (Losses) on Securities Available For Sale [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	(470)	(3,310)
Cumulative effect of change in accounting		300
Balance at beginning of period, as adjusted		(3,010)
Other comprehensive income (loss) before reclassifications	(3,054)	2,341
Amounts reclassified from AOCL	15	(69)
Other comprehensive income (loss)	(3,039)	2,272
Balance at end of period	(3,509)	(738)
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)
Cumulative effect of change in accounting		0
Balance at beginning of period, as adjusted		(5,798)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from AOCL	0	0
Other comprehensive income (loss)	0	0
Balance at end of period	(5,798)	(5,798)
Unrealized Gains on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period	269	0
Cumulative effect of change in accounting		0
Balance at beginning of period, as adjusted		0
Other comprehensive income (loss) before reclassifications	541	0
Amounts reclassified from AOCL	(5)	0
Other comprehensive income (loss)	536	0
Balance at end of period	$ 805	$ 0