Unaudited Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 80,802	$ 43,339
Other Comprehensive (Loss) Income, Net of Tax
Unrealized (losses) gains on available-for-sale securities	(84,798)	80,555
Reclassification adjustment for gains included in net income	(326)	(862)
Net unrealized (losses) gains on available-for-sale securities	(85,124)	79,693
Tax effect	21,511	(20,195)
Net of tax amount	(63,613)	59,498
Unrealized gains on derivatives used for cash flow hedges	593	0
Reclassification adjustment for losses included in net income	0	0
Net unrealized gains on derivatives used for cash flow hedges	593	0
Tax effect	(150)	0
Net of tax amount	443	0
Total other comprehensive (loss) income, net of tax	(63,170)	59,498
Total Comprehensive Income	$ 17,632	$ 102,837