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Accounting Policies - Components of Other Comprehensive Income Loss and Related Tax Impact (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 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 | $ 23,022 | $ 18,804
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax | 4,835 | 6,581
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax | 18,187 | 12,223
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 23,240 | 12,299
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (2,241) | (4,513)
Other Comprehensive Income (Loss), before Tax | 26,581 | 11,980
Other Comprehensive Income (Loss), Tax | 5,582 | 4,194
Other comprehensive income, net of tax | 20,999 | 7,786
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 | 6,396 | 117
Other Comprehensive Income (Loss) before Reclassifications, Tax | 1,343 | 41
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 5,053 | 76
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (211) | (332)
Other Comprehensive Income (Loss), before Tax | 6,663 | 629
Other Comprehensive Income (Loss), Tax | 1,399 | 221
Other comprehensive income, net of tax | 5,264 | 408
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 | 18,187 | 12,223
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 1,417 | 2,578
Other Comprehensive Income (Loss), before Tax | 21,228 | 14,838
Other Comprehensive Income (Loss), Tax | 4,458 | 5,193
Other comprehensive income, net of tax | 16,770 | 9,645
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
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 1,035 | 2,267
Other Comprehensive Income (Loss), before Tax | (1,310) | (3,487)
Other Comprehensive Income (Loss), Tax | (275) | (1,220)
Other comprehensive income, net of tax | (1,035) | (2,267)
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 | (3,959)
Reclassification from AOCI, Current Period, Tax | 0 | (1,386)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 2,573
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 | (7) | (7)
Reclassification from AOCI, Current Period, Tax | (2) | (2)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 5 | 5
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 | (1,787) | 0
Reclassification from AOCI, Current Period, Tax | (375) | 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 1,412 | 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 | (1,310) | (3,487)
Reclassification from AOCI, Current Period, Tax | (275) | (1,220)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 1,035 | 2,267
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 | 267 | 512
Reclassification from AOCI, Current Period, Tax | 56 | 180
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | $ (211) | $ (332)

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- Definition Amount before tax and reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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