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Accounting Policies - Components of Other Comprehensive Income Loss and Related Tax Impact (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax | $ (12,590) | $ 3,536 | $ 13,227 | $ 31,863
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax | (2,643) | 1,238 | 2,777 | 11,152
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax | (9,947) | 2,298 | 10,450 | 20,711
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (7,285) | 2,201 | 19,943 | 19,189
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (2,124) | (3,834) | (7,054) | (12,152)
Other Comprehensive Income (Loss), before Tax | (11,909) | (2,512) | 16,316 | 10,826
Other Comprehensive Income (Loss), Tax | (2,500) | (879) | 3,427 | 3,789
Other comprehensive income, net of tax | (9,409) | (1,633) | 12,889 | 7,037
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, before Tax | 3,370 | (150) | 12,017 | (2,342)
Other Comprehensive Income (Loss) before Reclassifications, Tax | 708 | (53) | 2,524 | (820)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 2,662 | (97) | 9,493 | (1,522)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (149) | 262 | 17 | 894
Other Comprehensive Income (Loss), before Tax | 3,181 | 253 | 12,038 | (966)
Other Comprehensive Income (Loss), Tax | 668 | 88 | 2,528 | (338)
Other comprehensive income, net of tax | 2,513 | 165 | 9,510 | (628)
Available-for-sale Securities [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (9,947) | 2,298 | 10,450 | 20,711
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (755) | (2,875) | (3,594) | (8,177)
Other Comprehensive Income (Loss), before Tax | (13,546) | (886) | 8,678 | 19,283
Other Comprehensive Income (Loss), Tax | (2,844) | (309) | 1,822 | 6,749
Other comprehensive income, net of tax | (10,702) | (577) | 6,856 | 12,534
Held-to-maturity Securities [Member] | Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 0 | 0 | 0 | 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (1,220) | (1,221) | (3,477) | (4,869)
Other Comprehensive Income (Loss), before Tax | (1,544) | (1,879) | (4,400) | (7,491)
Other Comprehensive Income (Loss), Tax | (324) | (658) | (923) | (2,622)
Other comprehensive income, net of tax | (1,220) | (1,221) | (3,477) | (4,869)
Gain (Loss) on Derivative Instruments [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] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 0 | (4,326) | 0 | (12,470)
Reclassification from AOCI, Current Period, Tax | 0 | (1,514) | 0 | (4,365)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 2,812 | 0 | 8,105
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] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (10) | (7) | (26) | (21)
Reclassification from AOCI, Current Period, Tax | (2) | (2) | (6) | (7)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 8 | 5 | 20 | 14
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] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (946) | 0 | (4,523) | 0
Reclassification from AOCI, Current Period, Tax | (199) | 0 | (949) | 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 747 | 0 | 3,574 | 0
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] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (1,544) | (1,879) | (4,400) | (7,491)
Reclassification from AOCI, Current Period, Tax | (324) | (658) | (923) | (2,622)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 1,220 | 1,221 | 3,477 | 4,869
Interest Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (189) | 403 | 21 | 1,376
Reclassification from AOCI, Current Period, Tax | (40) | 141 | 4 | 482
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | $ 149 | $ (262) | $ (17) | $ (894)

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