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Assets & Liability Derivative Positions & the Potential Effect of Netting Arrangements - Current Quarter (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Offsetting Liabilities [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | $ 32,936 | $ 26,113
Derivative Asset, Collateral, Obligation to Return Cash, Offset |  | 0 | 0
Derivative Asset |  | 32,936 | 26,113
Derivative, Collateral, Obligation to Return Securities | [1] | 13,186 | 6,556
Derivative, Collateral, Obligation to Return Cash |  | (1,190) | (8,528)
Derivative Asset, Fair Value, Amount Offset Against Collateral |  | 18,560 | 11,029
Derivative Liability, Fair Value, Gross Liability |  | 19,762 | 17,523
Derivative Liability, Collateral, Right to Reclaim Cash, Offset |  | 0 | 0
Derivative Liability |  | 19,762 | 17,523
Derivative, Collateral, Right to Reclaim Securities | [1] | 13,186 | 6,556
Derivative, Collateral, Right to Reclaim Cash |  | 505 | 173
Derivative Liability, Fair Value, Amount Offset Against Collateral |  | 6,071 | 10,794
Interest rate swaps |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Asset, Collateral, Obligation to Return Cash, Offset |  | 0 | 0
Derivative Asset |  | 13,136 | 8,955
Derivative, Collateral, Obligation to Return Securities | [1] | 9,988 | 391
Derivative, Collateral, Obligation to Return Cash |  | (928) | 5,527
Derivative Asset, Fair Value, Amount Offset Against Collateral |  | 2,220 | 3,037
Derivative Liability, Collateral, Right to Reclaim Cash, Offset |  | 0 | 0
Derivative Liability |  | 0 | 391
Derivative, Collateral, Right to Reclaim Securities | [1] | 0 | 391
Derivative, Collateral, Right to Reclaim Cash |  | 0 | 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 |  | 17,660 | 15,580
Derivative, Collateral, Obligation to Return Securities | [1] | 3,198 | 6,165
Derivative, Collateral, Obligation to Return Cash |  | (262) | 3,001
Derivative Asset, Fair Value, Amount Offset Against Collateral |  | 14,200 | 6,414
Derivative Liability, Collateral, Right to Reclaim Cash, Offset |  | 0 | 0
Derivative Liability |  | 17,660 | 15,584
Derivative, Collateral, Right to Reclaim Securities | [1] | 13,186 | 6,165
Derivative, Collateral, Right to Reclaim Cash |  | 505 | 173
Derivative Liability, Fair Value, Amount Offset Against Collateral |  | 3,969 | 9,246
Customer foreign exchange contracts |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Asset, Collateral, Obligation to Return Cash, Offset |  | 0 | 0
Derivative Asset |  | 2,140 | 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 |  | 2,140 | 1,578
Derivative Liability, Collateral, Right to Reclaim Cash, Offset |  | 0 | 0
Derivative Liability |  | 2,102 | 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 |  | 2,102 | 1,548
Other Assets [Member] |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 33,192 | 26,310
Other Assets [Member] | Loan level swaps |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 17,660 | 15,580
Other Assets [Member] | Customer foreign exchange contracts |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 2,140 | 1,578
Other Liabilities [Member] |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 19,762 | 17,523
Other Liabilities [Member] | Loan level swaps |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 17,660 | 15,584
Other Liabilities [Member] | Customer foreign exchange contracts |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 2,102 | 1,548
Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest rate swaps |  |  |
Offsetting Liabilities [Line Items] |  |  |
Interest Rate Derivative Assets, at Fair Value |  | 13,136 | 8,955
Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Interest rate swaps |  |  |
Offsetting Liabilities [Line Items] |  |  |
Interest Rate Derivative Liabilities, at Fair Value |  | $ 0 | $ 391
[1] | Reflects offsetting derivative positions with the same counterparty.

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