Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net Income	$ 28,241	$ 19,032	$ 59,364	$ 39,299
Other comprehensive income, net of tax:
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	0	0	2,024	0
Unrealized net holding (loss) gain on debt securities available-for-sale, net of federal income tax effect of $(630) and $1,621 for the three months ended June 30, 2018 and 2017, and $(6,853) and $2,171 for the six months ended June 30, 2018 and 2017, respectively	(2,368)	3,011	(25,778)	4,033
Other comprehensive income (loss)	(2,368)	3,011	(23,754)	4,033
Comprehensive income	25,873	$ 22,043	35,610	43,332
Accounting Standards Update 2016-01 [Member]
Other comprehensive income, net of tax:
Other comprehensive income (loss)	$ (2,368)		(28,555)
Accumulated Other Comprehensive Income (loss) [Member]
Other comprehensive income, net of tax:
Unrealized net holding (loss) gain on debt securities available-for-sale, net of federal income tax effect of $(630) and $1,621 for the three months ended June 30, 2018 and 2017, and $(6,853) and $2,171 for the six months ended June 30, 2018 and 2017, respectively			$ (23,754)	$ 4,033