Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Consolidated Statements of Comprehensive Income (Unaudited) [Abstract]
Net Income	$ 13,549	$ 9,941
Other Comprehensive Income
Increase in Net Unrealized Gain (Loss) on Available-for-Sale Securities	4,246	(5,288)
Deferred Tax (Expense) Benefit Related to Unrealized (Gains) Losses	(1,256)	1,563
Change in Net Unrealized Gain (Loss) on Available-for-Sale Securities, Net of Tax	2,990	(3,725)
Total Other Comprehensive Income (Loss)	2,990	(3,725)
Comprehensive Income	$ 16,539	$ 6,216