Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income
Balance, beginning			$ 40,226	$ (9,427)
Other comprehensive income (loss) before reclassification			90,422	52,766
Reclassification adjustments for (gains) losses included in net income			(739)	109
Total other comprehensive income, net of tax	$ 30,185	$ 19,561	89,683	52,875
Balance, end	129,909	43,448	129,909	43,448
Available-For-Sale Debt Securities
Accumulated Other Comprehensive Income
Balance, beginning			40,226	(6,613)
Other comprehensive income (loss) before reclassification			90,763	56,988
Reclassification adjustments for (gains) losses included in net income			(739)	(266)
Total other comprehensive income, net of tax			90,024	56,722
Balance, end	130,250	50,109	130,250	50,109
Derivatives Used for Cash Flow Hedges
Accumulated Other Comprehensive Income
Balance, beginning			0	(2,814)
Other comprehensive income (loss) before reclassification			(341)	(4,222)
Reclassification adjustments for (gains) losses included in net income			0	375
Total other comprehensive income, net of tax			(341)	(3,847)
Balance, end	$ (341)	$ (6,661)	$ (341)	$ (6,661)