Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Income	$ 31,123	$ 20,267
Other comprehensive income, net of tax:
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	2,024	0
Unrealized net holding (loss) gain on debt securities available-for-sale, net of federal income tax effect of $(6,223) and $550 for the three months ended March 31, 2018 and 2017, respectively	(23,410)	1,022
Other comprehensive income (loss)	(21,386)	1,022
Comprehensive income	9,737	21,289
Accounting Standards Update 2016-01 [Member]
Other comprehensive income, net of tax:
Other comprehensive income (loss)	(26,187)
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 $(6,223) and $550 for the three months ended March 31, 2018 and 2017, respectively	$ (21,386)	$ 1,022