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Summary of Significant Accounting Policies - Schedule of Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Before Tax |  |
Unrealized holding gains on available-for-sale-securities | $ 4,200 | $ 23,022
Other comprehensive (loss)/income before tax | (4,686) | 26,581
Provision (Benefit) |  |
Unrealized holding gains on available-for-sale-securities | 882 | 4,835
Other comprehensive (loss)/income | (984) | 5,582
After Tax |  |
Unrealized holding gains on available-for-sale-securities | 3,318 | 18,187
Less reclassification adjustments included in | 2,925 | 2,241
Other comprehensive (loss)/income net of tax | (3,702) | 20,999
Unrealized (losses)/gains on cash flow hedges | (777) | 23,240
Cash Flow Hedge [Member] |  |
Before Tax |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | (5,184) | 6,396
Other comprehensive (loss)/income before tax | (5,665) | 6,663
Provision (Benefit) |  |
Other comprehensive (loss)/income | (1,190) | 1,399
Unrealized (losses)/gains on cash flow hedges | (1,089) | 1,343
After Tax |  |
Less reclassification adjustments included in | 380 | (211)
Other comprehensive (loss)/income net of tax | (4,475) | 5,264
Unrealized (losses)/gains on cash flow hedges | (4,095) | 5,053
Available-for-sale Securities [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] |  |
Before Tax |  |
Other comprehensive (loss)/income before tax | 3,241 | 21,228
Provision (Benefit) |  |
Other comprehensive (loss)/income | 681 | 4,458
After Tax |  |
Less reclassification adjustments included in | 758 | 1,417
Other comprehensive (loss)/income net of tax | 2,560 | 16,770
Unrealized (losses)/gains on cash flow hedges | 3,318 | 18,187
Held-to-maturity Securities [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] |  |
Before Tax |  |
Other comprehensive (loss)/income before tax | (2,262) | (1,310)
Provision (Benefit) |  |
Other comprehensive (loss)/income | (475) | (275)
After Tax |  |
Less reclassification adjustments included in | 1,787 | 1,035
Other comprehensive (loss)/income net of tax | (1,787) | (1,035)
Unrealized (losses)/gains on cash flow hedges | 0 | 0
Interest Income [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Available-for-sale Securities [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] |  |
Before Tax |  |
Less reclassification adjustments included in | (953) | (1,787)
Provision (Benefit) |  |
Less reclassification adjustments included in | (200) | (375)
After Tax |  |
Less reclassification adjustments included in | (753) | (1,412)
Interest Income [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Held-to-maturity Securities [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] |  |
Before Tax |  |
Less reclassification adjustments included in | (2,262) | (1,310)
Provision (Benefit) |  |
Less reclassification adjustments included in | (475) | (275)
After Tax |  |
Less reclassification adjustments included in | (1,787) | (1,035)
Other Income [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Available-for-sale Securities [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] |  |
Before Tax |  |
Less reclassification adjustments included in | (6) | (7)
Provision (Benefit) |  |
Less reclassification adjustments included in | (1) | (2)
After Tax |  |
Less reclassification adjustments included in | (5) | (5)
Net interest income [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Cash Flow Hedge [Member] |  |
Before Tax |  |
Less reclassification adjustments included in | (481) | 267
Provision (Benefit) |  |
Less reclassification adjustments included in | (101) | 56
After Tax |  |
Less reclassification adjustments included in | $ (380) | $ 211

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