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Assets & Liability Derivative Positions & the Potential Effect of Netting Arrangements - Current Quarter (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Offsetting Liabilities [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | $ 20,029 | $ 22,331
Derivative Asset, Collateral, Obligation to Return Cash, Offset | 0 | 0
Derivative Asset | 20,029 | 22,331
Derivative, Collateral, Obligation to Return Securities | 4,087 | 4,222
Derivative, Collateral, Obligation to Return Cash | 0 | 0
Derivative Asset, Fair Value, Amount Offset Against Collateral | 15,942 | 18,109
Derivative Liability, Fair Value, Gross Liability | 198,863 | 198,596
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 | 0
Derivative Liability | 198,863 | 198,596
Derivative, Collateral, Right to Reclaim Securities | 4,087 | 4,222
Derivative, Collateral, Right to Reclaim Cash | 189,931 | 188,759
Derivative Liability, Fair Value, Amount Offset Against Collateral | 4,845 | 5,615
Interest rate swaps |  |
Offsetting Liabilities [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset |  | 1,364
Derivative Asset, Collateral, Obligation to Return Cash, Offset | 0 | 0
Derivative Asset | 1,229 | 1,364
Derivative, Collateral, Obligation to Return Securities | 1,229 | 961
Derivative, Collateral, Obligation to Return Cash | 0 | 0
Derivative Asset, Fair Value, Amount Offset Against Collateral | 0 | 403
Derivative Liability, Fair Value, Gross Liability |  | 740
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 | 0
Derivative Liability | 407 | 740
Derivative, Collateral, Right to Reclaim Securities | 0 | 0
Derivative, Collateral, Right to Reclaim Cash | 407 | 740
Derivative Liability, Fair Value, Amount Offset Against Collateral | 0 | 0
Loan level swaps |  |
Offsetting Liabilities [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset |  | 18,629
Derivative Asset, Collateral, Obligation to Return Cash, Offset | 0 | 0
Derivative Asset | 16,991 | 18,629
Derivative, Collateral, Obligation to Return Securities | 2,858 | 3,261
Derivative, Collateral, Obligation to Return Cash | 0 | 0
Derivative Asset, Fair Value, Amount Offset Against Collateral | 14,133 | 15,368
Derivative Liability, Fair Value, Gross Liability |  | 18,632
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 | 0
Derivative Liability | 16,992 | 18,632
Derivative, Collateral, Right to Reclaim Securities | 4,087 | 4,222
Derivative, Collateral, Right to Reclaim Cash | 9,854 | 11,106
Derivative Liability, Fair Value, Amount Offset Against Collateral | 3,051 | 3,304
Customer foreign exchange contracts |  |
Offsetting Liabilities [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset |  | 2,338
Derivative Asset, Collateral, Obligation to Return Cash, Offset | 0 | 0
Derivative Asset | 1,809 | 2,338
Derivative, Collateral, Obligation to Return Securities | 0 | 0
Derivative, Collateral, Obligation to Return Cash | 0 | 0
Derivative Asset, Fair Value, Amount Offset Against Collateral | 1,809 | 2,338
Derivative Liability, Fair Value, Gross Liability |  | 2,311
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 | 0
Derivative Liability | 1,794 | 2,311
Derivative, Collateral, Right to Reclaim Securities | 0 | 0
Derivative, Collateral, Right to Reclaim Cash | 0 | 0
Derivative Liability, Fair Value, Amount Offset Against Collateral | 1,794 | 2,311
Customer repurchase agreements and other short-term borrowings(f) |  |
Offsetting Liabilities [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | 179,670 | 176,913
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 | 0
Derivative Liability | 179,670 | 176,913
Derivative, Collateral, Right to Reclaim Securities | 0 | 0
Derivative, Collateral, Right to Reclaim Cash | 179,670 | 176,913
Derivative Liability, Fair Value, Amount Offset Against Collateral | 0 | 0
Other Assets [Member] |  |
Offsetting Liabilities [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 20,303 | 22,761
Other Assets [Member] | Loan level swaps |  |
Offsetting Liabilities [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 16,991 | 18,629
Other Assets [Member] | Customer foreign exchange contracts |  |
Offsetting Liabilities [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 1,809 | 2,338
Other Liabilities [Member] |  |
Offsetting Liabilities [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | 19,199 | 21,916
Other Liabilities [Member] | Loan level swaps |  |
Offsetting Liabilities [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | 16,992 | 18,632
Other Liabilities [Member] | Customer foreign exchange contracts |  |
Offsetting Liabilities [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | 1,794 | 2,311
Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest rate swaps |  |
Offsetting Liabilities [Line Items] |  |
Interest Rate Derivative Assets, at Fair Value | 1,229 | 1,364
Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Interest rate swaps |  |
Offsetting Liabilities [Line Items] |  |
Interest Rate Derivative Liabilities, at Fair Value | $ 407 | $ 740

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