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Assets & Liability Derivative Positions & the Potential Effect of Netting Arrangements - Current Quarter (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Offsetting Liabilities [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | $ 104,450 | $ 26,113
Derivative Asset, Collateral, Obligation to Return Cash, Offset |  | 0 | 0
Derivative Asset |  | 104,450 | 26,113
Derivative, Collateral, Obligation to Return Securities | [1] | 29,677 | 6,556
Derivative, Collateral, Obligation to Return Cash |  | 0 | (8,528)
Derivative Asset, Fair Value, Amount Offset Against Collateral |  | 74,773 | 11,029
Derivative Liability, Fair Value, Gross Liability |  | 75,093 | 17,523
Derivative Liability, Collateral, Right to Reclaim Cash, Offset |  | 0 | 0
Derivative Liability |  | 75,093 | 17,523
Derivative, Collateral, Right to Reclaim Securities | [1] | 29,677 | 6,556
Derivative, Collateral, Right to Reclaim Cash |  | 41,436 | 173
Derivative Liability, Fair Value, Amount Offset Against Collateral |  | 3,980 | 10,794
Interest rate swaps |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Asset, Collateral, Obligation to Return Cash, Offset |  | 0 | 0
Derivative Asset |  | 29,551 | 8,955
Derivative, Collateral, Obligation to Return Securities | [1] | 29,551 | 391
Derivative, Collateral, Obligation to Return Cash |  | 0 | 5,527
Derivative Asset, Fair Value, Amount Offset Against Collateral |  | 0 | 3,037
Derivative Liability, Collateral, Right to Reclaim Cash, Offset |  | 0 | 0
Derivative Liability |  | 244 | 391
Derivative, Collateral, Right to Reclaim Securities | [1] | 0 | 391
Derivative, Collateral, Right to Reclaim Cash |  | 244 | 0
Derivative Liability, Fair Value, Amount Offset Against Collateral |  | 0 | 0
Loan level swaps |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Asset, Collateral, Obligation to Return Cash, Offset |  | 0 | 0
Derivative Asset |  | 71,554 | 15,580
Derivative, Collateral, Obligation to Return Securities | [1] | 126 | 6,165
Derivative, Collateral, Obligation to Return Cash |  | 0 | 3,001
Derivative Asset, Fair Value, Amount Offset Against Collateral |  | 71,428 | 6,414
Derivative Liability, Collateral, Right to Reclaim Cash, Offset |  | 0 | 0
Derivative Liability |  | 71,544 | 15,584
Derivative, Collateral, Right to Reclaim Securities | [1] | 29,677 | 6,165
Derivative, Collateral, Right to Reclaim Cash |  | 41,192 | 173
Derivative Liability, Fair Value, Amount Offset Against Collateral |  | 675 | 9,246
Customer foreign exchange contracts |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Asset, Collateral, Obligation to Return Cash, Offset |  | 0 | 0
Derivative Asset |  | 3,345 | 1,578
Derivative, Collateral, Obligation to Return Securities | [1] | 0 | 0
Derivative, Collateral, Obligation to Return Cash |  | 0 | 0
Derivative Asset, Fair Value, Amount Offset Against Collateral |  | 3,345 | 1,578
Derivative Liability, Collateral, Right to Reclaim Cash, Offset |  | 0 | 0
Derivative Liability |  | 3,305 | 1,548
Derivative, Collateral, Right to Reclaim Securities | [1] | 0 | 0
Derivative, Collateral, Right to Reclaim Cash |  | 0 | 0
Derivative Liability, Fair Value, Amount Offset Against Collateral |  | 3,305 | 1,548
Other Assets [Member] |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 106,601 | 26,310
Other Assets [Member] | Loan level swaps |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 71,554 | 15,580
Other Assets [Member] | Customer foreign exchange contracts |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 3,345 | 1,578
Other Liabilities [Member] |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 75,134 | 17,523
Other Liabilities [Member] | Loan level swaps |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 71,544 | 15,584
Other Liabilities [Member] | Customer foreign exchange contracts |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 3,305 | 1,548
Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest rate swaps |  |  |
Offsetting Liabilities [Line Items] |  |  |
Interest Rate Derivative Assets, at Fair Value |  | 29,551 | 8,955
Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Interest rate swaps |  |  |
Offsetting Liabilities [Line Items] |  |  |
Interest Rate Derivative Liabilities, at Fair Value |  | $ 244 | $ 391
[1] | Reflects offsetting derivative positions with the same counterparty.

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