Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net Income	$ 24,762	$ 22,112	$ 84,126	$ 61,411
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 $(1,364) and $380 for the three months ended September 30, 2018 and 2017, and $(8,217) and $2,551 for the nine months ended September 30, 2018 and 2017, respectively	(5,141)	707	(30,919)	4,740
Other comprehensive income (loss)	(5,141)	707	(28,895)	4,740
Comprehensive income	$ 19,621	$ 22,819	55,231	66,151
Accounting Standards Update 2016-01 [Member]
Other comprehensive income, net of tax:
Other comprehensive income (loss)			(33,696)
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 $(1,364) and $380 for the three months ended September 30, 2018 and 2017, and $(8,217) and $2,551 for the nine months ended September 30, 2018 and 2017, respectively			$ (28,895)	$ 4,740