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Financial Derivatives Derivatives in Fair Value and Cash Flow Hedging Relationships (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Interest Income, Operating | $ 74,179 | $ 50,106 | $ 136,609 | $ 92,628
Interest and Fee Income, Loans and Leases | 49,396 | 39,573 | 95,049 | 76,425
Total interest expense | (91,737) | (58,316) | (168,054) | (107,862)
Gain (Loss) on Derivative Instruments, Net, Pretax | (2,534) | 617 | 1,316 | (1,869)
TotalAmountsofLineItemsPresentedintheConsolidatedStatementofIncome | 34,372 | 30,746 | 62,288 | 63,060
Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | 1,862 | 1,420 | 4,701 | (2,457)
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness |  | (146) |  | (175)
Income_Expense related to interest settlements on fair value hedges | 5,402 | 5,263 | 9,503 | 10,402
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Derivative | 11,989 | (8,568) | 29,212 | (7,041)
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Hedged Item | (10,127) | 9,988 | (24,511) | 4,584
Cash Flow Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Premium_Discount recognized on hedged item | (2) | (1) | (4) | (2)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 57 | (497) | (210) | (1,040)
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Hedged Item | (2,330) | (845) | (4,110) | (1,496)
Unrealized Gain (Loss) on Cash Flow Hedging Instruments | (2,275) | (1,489) | (4,324) | (2,713)
Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Hedged Item Net Interest Settlements | 7,394 | 7,160 | 13,740 | 15,561
Premium_Discount recognized on hedged item | (188) | (120) | (353) | (190)
Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax |  | 1,891 |  | (4,501)
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 | 1,636 | 0 | 3,137 | 0
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Hedged Item | (10,849) | 0 | (29,797) | 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 | 15,923 | 11,633 | 29,409 | 22,226
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 | (237) | 0 | (390) | 0
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Hedged Item | (2,472) | 0 | (9,045) | 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 | 1,545 | 583 | 2,959 | 1,099
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 |  | 0 |
Interest Expense [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | 463 | 0 | 1,954 | 0
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Hedged Item | 3,194 | 0 | 14,331 | 0
Interest Expense [Member] | Cash Flow Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Premium_Discount recognized on hedged item | (2) | (1) | (4) | (2)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 57 | (497) | (210) | (1,040)
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Hedged Item | (2,330) | (845) | (4,110) | (1,496)
Unrealized Gain (Loss) on Cash Flow Hedging Instruments | (2,275) | (1,343) | (4,324) | (2,538)
Interest Expense [Member] | Designated as Hedging Instrument [Member] | Fair Value Hedging [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Hedged Item Net Interest Settlements | (10,074) | (5,056) | (18,628) | (7,764)
Premium_Discount recognized on hedged item | (188) | (120) | (353) | (190)
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
Gain (Loss) on Derivative Instruments [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | (2,534) | 1,891 | 1,316 | (4,501)
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 | 1,420 | 0 | (2,457)
Gain (Loss) on Interest Rate Cash Flow Hedge Ineffectiveness |  | (146) |  | (175)
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 | (8,568) | 0 | (7,041)
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Hedged Item | 0 | 9,988 | 0 | 4,584
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 | (146) | 0 | (175)
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 | (1,804) | (1,777) | (3,884) | (4,969)
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gain (Loss) on Components Included from Assessment of Interest Rate Fair Value Hedge Effectiveness |  | (1,300) |  | 2,300
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net |  | 100 |  | (100)
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Line Items Presented in the Consolidated Statement of Income [Abstract] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | (2,396) | 1,648 | 1,679 | (5,036)
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 | 681 | (2,826) | (807) | (5,984)
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 | 16,604 | 8,807 | 28,602 | 16,242
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Derivative | 12,485 | 0 | 32,934 | 0
Interest Rate Swap [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
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 | (165) | (208) | (463) | (425)
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 | 1,380 | 375 | 2,496 | 674
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Derivative | 2,235 | 0 | 8,655 | 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] |  |  |  |
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 | (2,320) | 1,257 | (2,614) | 1,440
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 | (12,582) | (3,919) | (21,595) | (6,514)
Derivative Net Hedge Ineffectiveness Gain Loss Component Recognized On Derivative | (2,731) | 0 | (12,377) | 0
Interest Rate Swap [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
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] |  |  |  |
Gain (Loss) on Derivative Instruments, Net, Pretax | (2,396) | 1,648 | 1,679 | (5,036)
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 |  | 189 |  | 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 |  | 189 |  | 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 | (138) | 54 | (363) | (53)
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 | $ (138) | $ 54 | $ (363) | $ (53)

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