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Accounting Policies - Components of Other Comprehensive Income Loss and Related Tax Impact (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax | $ (24,241) | $ 36,809 | $ 8,433
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax | (5,090) | 12,884 | 2,952
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax | (19,151) | 23,925 | 5,481
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | (16,580) | 24,077 | 55,062
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (9,576) | (15,803) | (10,285)
Other Comprehensive Income (Loss), before Tax | (33,109) | 12,729 | 68,889
Other Comprehensive Income (Loss), Tax | (6,953) | 4,455 | 24,112
Other comprehensive income, net of tax | (26,156) | 8,274 | 44,777
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 | 3,254 | 233 | 2,443
Other Comprehensive Income (Loss) before Reclassifications, Tax | 683 | 81 | 855
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 2,571 | 152 | 1,588
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (250) | 1,178 | 1,313
Other Comprehensive Income (Loss), before Tax | 2,938 | 2,046 | 4,463
Other Comprehensive Income (Loss), Tax | 617 | 716 | 1,562
Other comprehensive income, net of tax | 2,321 | 1,330 | 2,901
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 | (19,151) | 23,925 | 5,481
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (4,533) | (10,917) | (9,833)
Other Comprehensive Income (Loss), before Tax | (29,980) | 20,012 | (6,694)
Other Comprehensive Income (Loss), Tax | (6,296) | 7,004 | (2,342)
Other comprehensive income, net of tax | (23,684) | 13,008 | (4,352)
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, before Tax | 0 | 0 | 73,835
Other Comprehensive Income (Loss) before Reclassifications, Tax | 0 | 0 | 25,842
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 0 | 0 | 47,993
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (4,793) | (6,064) | (1,765)
Other Comprehensive Income (Loss), before Tax | (6,067) | (9,329) | 71,120
Other Comprehensive Income (Loss), Tax | (1,274) | (3,265) | 24,892
Other comprehensive income, net of tax | (4,793) | (6,064) | 46,228
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 | (16,845) | (15,375)
Reclassification from AOCI, Current Period, Tax | 0 | (5,897) | (5,381)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 10,948 | 9,994
Gain (Loss) on Investments [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 | (89) | 9
Reclassification from AOCI, Current Period, Tax | 0 | (31) | 3
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 58 | (6)
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 | 45 | 137 | 239
Reclassification from AOCI, Current Period, Tax | 9 | 48 | 84
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (36) | (89) | (155)
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 | (5,784) | 0 | 0
Reclassification from AOCI, Current Period, Tax | (1,215) | 0 | 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 4,569 | 0 | 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 | (6,067) | (9,329) | (2,715)
Reclassification from AOCI, Current Period, Tax | (1,274) | (3,265) | (950)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 4,793 | 6,064 | 1,765
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 | (316) | 1,813 | 2,020
Reclassification from AOCI, Current Period, Tax | (66) | 635 | 707
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | $ 250 | $ (1,178) | $ (1,313)

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