Accumulated Other Comprehensive Loss ("AOCL"), Reclassification Out of Each components (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total reclassifications before tax	$ 8,595	$ 6,057
Income tax expense	2,621	1,957
Reclassifications, net of tax	5,974	4,100
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	106	174
Net impairment loss recognized in earnings	0	0
Total reclassifications before tax	106	174
Income tax expense	37	62
Reclassifications, net of tax	$ 69	$ 112