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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 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 | $ 14,587 | $ 17,054 | $ 28,616 | $ 32,329
Change in unrealized gain on available-for-sale debt securities, tax | 3,603 | 4,212 | 7,068 | 7,985
Change in unrealized gain on available-for-sale debt securities, after tax | 10,984 | 12,842 | 21,548 | 24,344
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 | 0 | 0 | 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 | (437) | 4 | (644) | 7
Reclassification of (gain) loss on held-to-maturity securities, tax | (108) | 1 | (159) | 2
Reclassification of (gain) loss on held-to-maturity securities, after tax | (329) | 3 | (485) | 5
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 | (1,563) | (1,679) | (8,442) | (2,944)
Change in unrealized loss on cash flow hedges arising during the period, tax | (386) | (414) | (2,085) | (727)
Change in unrealized loss on cash flow hedges arising during the period, after tax | (1,177) | (1,265) | (6,357) | (2,217)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax [Abstract] |  |  |  |
Reclassification of loss on cash flow hedges, before tax | 311 | 5 | 474 | 5
Reclassification of loss on cash flow hedges, tax | 77 | 1 | 117 | 1
Reclassification of loss on cash flow hedges, after tax | (234) | (4) | (357) | (4)
OCI, Net of Tax [Abstract] |  |  |  |
Total other comprehensive income, before tax | 12,898 | 15,384 | 20,000 | 29,689
Total other comprehensive income, tax | 3,186 | 3,800 | 4,940 | 7,333
Total other comprehensive income, after-tax | $ 9,712 | $ 11,584 | $ 15,060 | $ 22,356

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