Accumulated Other Comprehensive Loss ("AOCL") (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period			$ 251,092	$ 250,371
Other comprehensive income (loss) before reclassifications	$ 1,588	$ (1,188)	2,937	295
Amounts reclassified from AOCL	(72)	0	(184)	(49)
Net current period other comprehensive income (loss)	1,516	(1,188)	2,753	246
Balance at end of period	246,923	254,375	246,923	254,375
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications before tax	9,049	8,243	15,106	13,804
Income tax expense	2,611	2,624	4,568	4,404
Reclassifications, net of tax	6,438	5,619	10,538	9,400
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(4,799)	(4,202)	(6,036)	(5,636)
Balance at end of period	(3,283)	(5,390)	(3,283)	(5,390)
Unrealized Gains (Losses) on Securities Available For Sale [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	999	1,596	(238)	162
Other comprehensive income (loss) before reclassifications	1,588	(1,188)	2,937	295
Amounts reclassified from AOCL	(72)	0	(184)	(49)
Net current period other comprehensive income (loss)	1,516	(1,188)	2,753	246
Balance at end of period	2,515	408	2,515	408
Unrealized Gains (Losses) on Securities Available For Sale [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net gains on securities	109	0	283	75
Net impairment loss recognized in earnings	0	0	0	0
Total reclassifications before tax	109	0	283	75
Income tax expense	37	0	99	26
Reclassifications, net of tax	72	0	184	49
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)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassified from AOCL	0	0	0	0
Net current period other comprehensive income (loss)	0	0	0	0
Balance at end of period	$ (5,798)	$ (5,798)	$ (5,798)	$ (5,798)