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Financial Derivatives Derivatives in Fair Value and Cash Flow Hedging Relationships (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Interest Income, Operating | $ 76,870 | $ 54,350 | $ 213,479 | $ 146,978
Interest and Fee Income, Loans and Leases | 50,622 | 40,924 | 145,671 | 117,349
Total interest expense | (97,557) | (64,935) | (265,611) | (172,797)
Gain (Loss) on Derivative Instruments, Net, Pretax | (628) | (661) | 688 | (2,530)
TotalAmountsofLineItemsPresentedintheConsolidatedStatementofIncome | 30,563 | 31,000 | 92,851 | 94,060
Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | 1,051 | 1,742 | 5,751 | (716)
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness |  | (191) |  | (365)
Income_Expense related to interest settlements on fair value hedges | 6,903 | 5,851 | 16,331 | 16,253
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Derivative | 16,141 | 1,576 | 45,353 | (5,466)
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Hedged Item | (15,090) | 166 | (39,602) | 4,750
Cash Flow Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Premium_Discount recognized on hedged item | (2) | (1) | (5) | (3)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 189 | (454) | (21) | (1,494)
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Hedged Item | (2,501) | (1,169) | (6,611) | (2,665)
Unrealized Gain (Loss) on Cash Flow Hedging Instruments | (2,314) | (1,815) | (6,637) | (4,527)
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Hedged Item Net Interest Settlements | 8,608 | 7,864 | 22,275 | 23,425
Premium_Discount recognized on hedged item | (177) | (121) | (534) | (311)
Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax |  | 890 |  | (3,611)
Interest Income [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | 0 |  | 0 |
Interest Income [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | (12) | 0 | 3,125 | 0
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Hedged Item | (13,432) | 0 | (43,229) | 0
Interest Income [Member] | Cash Flow Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Premium_Discount recognized on hedged item | 0 | 0 | 0 | 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 0 | 0 | 0 | 0
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Hedged Item | 0 | 0 | 0 | 0
Unrealized Gain (Loss) on Cash Flow Hedging Instruments | 0 | 0 | 0 | 0
Interest Income [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Hedged Item Net Interest Settlements | 16,769 | 11,986 | 46,289 | 34,212
Premium_Discount recognized on hedged item | 0 | 0 | 0 | 0
Interest Income [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax |  | 0 |  | 0
Loans and Finance Receivables [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | 0 |  | 0 |
Loans and Finance Receivables [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | (153) | 0 | (542) | 0
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Hedged Item | (4,062) | 0 | (13,106) | 0
Loans and Finance Receivables [Member] | Cash Flow Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Premium_Discount recognized on hedged item | 0 | 0 | 0 | 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 0 | 0 | 0 | 0
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Hedged Item | 0 | 0 | 0 | 0
Unrealized Gain (Loss) on Cash Flow Hedging Instruments | 0 | 0 | 0 | 0
Loans and Finance Receivables [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Hedged Item Net Interest Settlements | 1,660 | 947 | 4,619 | 2,045
Premium_Discount recognized on hedged item | 0 | 0 | 0 | 0
Loans and Finance Receivables [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax |  | 0 |  | 0
Interest Expense [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | 0 |  |  |
Interest Expense [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | 1,216 | 0 | 3,168 | 0
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Hedged Item | 2,404 | 0 | 16,733 | 0
Interest Expense [Member] | Cash Flow Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Premium_Discount recognized on hedged item | (2) | (1) | (5) | (3)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 189 | (454) | (21) | (1,494)
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Hedged Item | (2,501) | (1,169) | (6,611) | (2,665)
Unrealized Gain (Loss) on Cash Flow Hedging Instruments | (2,314) | (1,624) | (6,637) | (4,162)
Interest Expense [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Hedged Item Net Interest Settlements | (9,821) | (5,069) | (28,633) | (12,832)
Premium_Discount recognized on hedged item | (177) | (121) | (534) | (311)
Interest Expense [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax |  | 0 | 0 | 0
Gain (Loss) on Derivative Instruments [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | (628) | 890 | 688 | (3,611)
Gain (Loss) on Derivative Instruments [Member] | Fair Value Hedging [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Derivative Net Interest Settlements | 0 | 0 | 0 | 0
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | 0 | 1,742 | 0 | (716)
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness |  | (191) |  | (365)
Income_Expense related to interest settlements on fair value hedges | 0 | 0 | 0 | 0
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Derivative | 0 | 1,576 | 0 | (5,466)
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Hedged Item | 0 | 166 | 0 | 4,750
Gain (Loss) on Derivative Instruments [Member] | Cash Flow Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Premium_Discount recognized on hedged item | 0 | 0 | 0 | 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 0 | 0 | 0 | 0
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Hedged Item | 0 | 0 | 0 | 0
Unrealized Gain (Loss) on Cash Flow Hedging Instruments | 0 | (191) | 0 | (365)
Gain (Loss) on Derivative Instruments [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Hedged Item Net Interest Settlements | 0 | 0 | 0 | 0
Premium_Discount recognized on hedged item | 0 | 0 | 0 | 0
Interest Rate Swap [Member] | Fair Value Hedging [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Derivative Net Interest Settlements | (1,528) | (1,892) | (5,410) | (6,861)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) on Components Included from Assessment of Interest Rate Fair Value Hedge Effectiveness |  | (1,600) |  | 700
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net |  | 100 |  | 0
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Total interest expense | (3,048) | (2,676) | (8,903) | (8,318)
Gain (Loss) on Derivative Instruments, Net, Pretax | (3,267) | (1,645) | (7,443) | (12,324)
Interest Rate Swap [Member] | Interest Income [Member] | Fair Value Hedging [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Derivative Net Interest Settlements | 1,272 | (2,267) | 465 | (8,251)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness |  | 0 |  | 0
Income_Expense related to interest settlements on fair value hedges | 18,041 | 9,719 | 46,754 | 25,961
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Derivative | 13,420 | 0 | 46,354 | 0
Interest Rate Swap [Member] | Interest Income [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Total interest expense | 0 | 0 | 0 | 0
Gain (Loss) on Derivative Instruments, Net, Pretax | 0 | 0 | 0 | 0
Interest Rate Swap [Member] | Loans and Finance Receivables [Member] | Fair Value Hedging [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Derivative Net Interest Settlements | (98) | (342) | (560) | (767)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness |  | 0 |  | 0
Income_Expense related to interest settlements on fair value hedges | 1,562 | 605 | 4,059 | 1,278
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Derivative | 3,909 | 0 | 12,564 | 0
Interest Rate Swap [Member] | Loans and Finance Receivables [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Total interest expense | 0 | 0 | 0 | 0
Gain (Loss) on Derivative Instruments, Net, Pretax | 0 | 0 | 0 | 0
Interest Rate Swap [Member] | Interest Expense [Member] | Fair Value Hedging [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Derivative Net Interest Settlements | (2,702) | 717 | (5,315) | 2,157
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness |  | 0 |  | 0
Income_Expense related to interest settlements on fair value hedges | (12,700) | (4,473) | (34,482) | (10,986)
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Derivative | (1,188) | 0 | (13,565) | 0
Interest Rate Swap [Member] | Interest Expense [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Total interest expense | 0 | 0 | 0 | 0
Gain (Loss) on Derivative Instruments, Net, Pretax | 0 | 0 | 0 | 0
Interest Rate Swap [Member] | Gain (Loss) on Derivative Instruments [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Total interest expense | (3,048) | (2,676) | (8,903) | (8,318)
Gain (Loss) on Derivative Instruments, Net, Pretax | (3,267) | (1,645) | (7,443) | (12,324)
Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax |  | 0 |  | 588
Forward Contracts [Member] | Interest Income [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax |  | 0 |  | 0
Forward Contracts [Member] | Loans and Finance Receivables [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax |  | 0 |  | 0
Forward Contracts [Member] | Interest Expense [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax |  | 0 |  | 0
Forward Contracts [Member] | Gain (Loss) on Derivative Instruments [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax |  | 0 |  | 588
Future [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | (409) | (141) | (772) | (193)
Future [Member] | Interest Income [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | 0 | 0 | 0 | 0
Future [Member] | Loans and Finance Receivables [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | 0 | 0 | 0 | 0
Future [Member] | Interest Expense [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | 0 | 0 | 0 | 0
Future [Member] | Gain (Loss) on Derivative Instruments [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | $ (409) | $ (141) | $ (772) | $ (193)

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