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Accounting Policies - Components of Other Comprehensive Income Loss and Related Tax Impact (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 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 | $ 2,795 | $ 9,525 | $ 25,817 | $ 28,328
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax | 586 | 3,334 | 5,421 | 9,915
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax | 2,209 | 6,191 | 20,396 | 18,413
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 3,987 | 4,691 | 27,227 | 16,987
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (2,688) | (3,807) | (4,929) | 8,317
Other Comprehensive Income (Loss), before Tax | 1,644 | 1,360 | 28,225 | 13,339
Other Comprehensive Income (Loss), Tax | 345 | 476 | 5,927 | 4,669
Other comprehensive income, net of tax | 1,299 | 884 | 22,298 | 8,670
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 | 2,251 | (2,309) | 8,647 | (2,192)
Other Comprehensive Income (Loss) before Reclassifications, Tax | 473 | (809) | 1,816 | (766)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | 1,778 | (1,500) | 6,831 | (1,426)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 45 | (299) | (166) | (633)
Other Comprehensive Income (Loss), before Tax | 2,194 | (1,848) | 8,857 | (1,219)
Other Comprehensive Income (Loss), Tax | 461 | (647) | 1,860 | (426)
Other comprehensive income, net of tax | 1,733 | (1,201) | 6,997 | (793)
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 | 2,209 | 6,191 | 20,396 | 18,413
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 1,421 | 2,725 | 2,838 | 5,302
Other Comprehensive Income (Loss), before Tax | 996 | 5,333 | 22,224 | 20,170
Other Comprehensive Income (Loss), Tax | 208 | 1,867 | 4,666 | 7,059
Other comprehensive income, net of tax | 788 | 3,466 | 17,558 | 13,111
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 | 1,222 | 1,381 | 2,257 | 3,648
Other Comprehensive Income (Loss), before Tax | (1,546) | (2,125) | (2,856) | (5,612)
Other Comprehensive Income (Loss), Tax | (324) | (744) | (599) | (1,964)
Other comprehensive income, net of tax | (1,222) | (1,381) | (2,257) | (3,648)
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 | (4,186) | 0 | (8,145)
Reclassification from AOCI, Current Period, Tax | 0 | (1,465) | 0 | (2,851)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 2,721 | 0 | 5,294
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 | (8) | (6) | (15) | (13)
Reclassification from AOCI, Current Period, Tax | (2) | (2) | (3) | (5)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 6 | 4 | 12 | 8
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 | (1,791) | 0 | (3,578) | 0
Reclassification from AOCI, Current Period, Tax | (376) | 0 | (752) | 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 1,415 | 0 | 2,826 | 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 | (1,546) | (2,125) | (2,856) | (5,612)
Reclassification from AOCI, Current Period, Tax | (324) | (744) | (599) | (1,964)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 1,222 | 1,381 | 2,257 | 3,648
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 | (57) | 461 | 210 | 973
Reclassification from AOCI, Current Period, Tax | (12) | 162 | 44 | 340
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | $ 45 | $ (299) | $ (166) | $ (633)

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