Other Comprehensive Income (Loss) (Classifications out of AOCI) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income Tax Expense	$ (2,326)	$ (3,425)	$ (4,810)	$ (7,246)
NET INCOME	11,097	9,839	22,910	19,395
Total Reclassifications	58	0	271	0
Unrealized Gains and Losses on Available-for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total Reclassifications	58	0	271	0
Amount Reclassified From Accumulated Other Comprehensive Income (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total Reclassifications	58	0	271	0
Amount Reclassified From Accumulated Other Comprehensive Income (Loss) | Unrealized Gains and Losses on Available-for-Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net Gains on Securities	74	0	344	0
Income Tax Expense	(16)	0	(73)	0
NET INCOME	$ 58	$ 0	$ 271	$ 0