Accumulated Other Comprehensive Income - Pre-tax and After-tax Changes in the Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax [Abstract]
Change in unrealized gain on available-for-sale debt securities, before tax	$ 14,029	$ 15,275
Change in unrealized gain on available-for-sale debt securities, tax	3,465	3,773
Change in unrealized gain on available-for-sale debt securities, after tax	10,564	11,502
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax [Abstract]
Reclassification adjustment for realized (gain) loss on sale of available-for-sale debt securities, before tax	(4)	292
Reclassification adjustment for realized (gain) loss on sale of available-for-sale debt securities, tax	(1)	72
Reclassification adjustment for realized (gain) loss on sale of available-for-sale debt securities, after tax	3	(220)
Other Comprehensive Loss, Held-to-maturity Security, OTTI, after Tax and Adjustments [Abstract]
Reclassification of (gain) loss on held-to-maturity securities, before tax	(207)	3
Reclassification of (gain) loss on held-to-maturity securities, tax	(51)	1
Reclassification of (gain) loss on held-to-maturity securities, after tax	(156)	2
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Parent [Abstract]
Change in unrealized loss on cash flow hedges arising during the period, before tax	(6,879)	(1,264)
Change in unrealized loss on cash flow hedges arising during the period, tax	(1,699)	(312)
Change in unrealized loss on cash flow hedges arising during the period, after tax	(5,180)	(952)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract]
Reclassification of loss on cash flow hedges, before tax	163	0
Reclassification of loss on cash flow hedges, tax	(40)	0
Reclassification of loss on cash flow hedges, after tax	(123)	0
OCI, Net of Tax [Abstract]
Total other comprehensive income, before tax	7,102	14,306
Total other comprehensive income, tax	1,754	3,534
Total other comprehensive income, after-tax	$ 5,348	$ 10,772

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