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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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 | $ 36,809 | $ 8,433 | $ (9,270)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax | 12,884 | 2,952 | (3,244)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax | 23,925 | 5,481 | (6,026)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 24,077 | 55,062 | (7,181)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 1,800 | 2,000 | 1,200
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (15,803) | (10,285) | (19,371)
Other Comprehensive Income (Loss), before Tax | 12,729 | 68,889 | (40,850)
Other Comprehensive Income (Loss), Tax | 4,455 | 24,112 | (14,298)
Other comprehensive income, net of tax | 8,274 | 44,777 | (26,552)
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 | 233 | 2,443 | (1,776)
Other Comprehensive Income (Loss) before Reclassifications, Tax | 81 | 855 | (621)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 152 | 1,588 | (1,155)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 1,178 | 1,313 | 803
Other Comprehensive Income (Loss), before Tax | 2,046 | 4,463 | (541)
Other Comprehensive Income (Loss), Tax | 716 | 1,562 | (189)
Other comprehensive income, net of tax | 1,330 | 2,901 | (352)
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 | 23,925 | 5,481 | (6,026)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (10,917) | (9,833) | (13,725)
Other Comprehensive Income (Loss), before Tax | 20,012 | (6,694) | (30,387)
Other Comprehensive Income (Loss), Tax | 7,004 | (2,342) | (10,636)
Other comprehensive income, net of tax | 13,008 | (4,352) | (19,751)
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 | 73,835 | 0
Other Comprehensive Income (Loss) before Reclassifications, Tax | 0 | 25,842 | 0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 0 | 47,993 | 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (6,064) | (1,765) | (6,449)
Other Comprehensive Income (Loss), before Tax | (9,329) | 71,120 | (9,922)
Other Comprehensive Income (Loss), Tax | (3,265) | 24,892 | (3,473)
Other comprehensive income, net of tax | (6,064) | 46,228 | (6,449)
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 | (16,845) | (15,375) | (20,125)
Reclassification from AOCI, Current Period, Tax | (5,897) | (5,381) | (7,044)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (10,948) | (9,994) | (13,081)
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 | (89) | 9 | (10)
Reclassification from AOCI, Current Period, Tax | (31) | 3 | (4)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (58) | 6 | (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 | 137 | 239 | (982)
Reclassification from AOCI, Current Period, Tax | 48 | 84 | (344)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 89 | 155 | (638)
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 | (9,329) | (2,715) | (9,922)
Reclassification from AOCI, Current Period, Tax | (3,265) | (950) | (3,473)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (6,064) | (1,765) | (6,449)
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 | 1,813 | 2,020 | 1,235
Reclassification from AOCI, Current Period, Tax | 635 | 707 | 432
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | $ 1,178 | $ 1,313 | $ 803

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