Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net Income	$ 30,846	$ 31,146	$ 82,723	$ 78,764
Other comprehensive income, net of tax:
Unrealized net holding gain (loss) on debt securities available-for-sale, net of income tax effect of $55 and $(1,385) for the three months ended September 30, 2020 and 2019, respectively, and $7,109 and $4,864 for the nine months ended September 30, 2020 and 2019, respectively.	207	(5,206)	26,742	18,302
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	111	(49)	(357)	(556)
Other comprehensive income (loss)	339	13,693	23,789	37,174
Comprehensive income	31,185	44,839	106,512	115,938
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax	228	13,742	24,146	37,730
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	21	(147)	(2,596)	333
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	6	(39)	(690)	88
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax	0	19,095	0	19,095
OCI, Debt Securities, Available-for-Sale, Transfer from Held-to-Maturity, Gain (Loss), before Adjustment, Tax				5,076
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	30	(13)	(94)	(148)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax	55	(1,385)	$ 7,109	$ 4,864
Accumulated Other Comprehensive Income (loss) [Member]
Other comprehensive income, net of tax:
Other comprehensive income (loss)	$ 339	$ 13,693