Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net Income	$ 31,146	$ 24,762	$ 78,764	$ 84,126
Other comprehensive income, net of tax:
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	(147)	0	333	2,024
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax	19,095	0	19,095	0
Unrealized net holding (loss) gain on debt securities available-for-sale, net of income tax effect of $(1,385) and $(1,364) for the three months ended September 30, 2019 and 2018, respectively and $4,864 and $(8,217) for the nine months ended September 30, 2019 and 2018, respectively	(5,206)	(5,141)	18,302	(30,919)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	(49)	0	(556)	0
Other comprehensive income (loss)	13,693	(5,141)	37,174	(28,895)
Comprehensive income	44,839	19,621	$ 115,938	$ 55,231
Accumulated Other Comprehensive Income (loss) [Member]
Other comprehensive income, net of tax:
Other comprehensive income (loss)	$ 13,693	$ (5,141)