Condensed Consolidated 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
Statement of Comprehensive Income [Abstract]
Net income	$ 17,951	$ 29,069	$ 45,453	$ 63,649
Other comprehensive income (loss), after-tax:
Change in unrealized gain on available-for-sale debt securities	94	7,018	21,642	31,362
Reclassification adjustment for realized gain on sale of available-for-sale debt securities	(314)	(254)	(317)	(34)
Reclassification of (gain) loss on held-to-maturity securities	(705)	10	(1,190)	15
Change in unrealized gain (loss) on cash flow hedges arising during the period	110	(669)	(6,247)	(2,886)
Reclassification of loss on cash flow hedges	514	32	871	36
Total other comprehensive income (loss), after-tax	(301)	6,137	14,759	28,493
Comprehensive income	$ 17,650	$ 35,206	$ 60,212	$ 92,142