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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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