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Assets & Liability Derivative Positions & the Potential Effect of Netting Arrangements - Current Quarter (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Offsetting Liabilities [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | $ 26,392 | $ 17,318
Derivative Asset, Collateral, Obligation to Return Cash, Offset |  | 0 | 0
Derivative Asset |  | 26,392 | 17,318
Derivative, Collateral, Obligation to Return Securities | [1] | 3,626 | 5,383
Derivative, Collateral, Obligation to Return Cash |  | (11,350) | 0
Derivative Asset, Fair Value, Amount Offset Against Collateral |  | 11,416 | 11,935
Derivative Liability, Fair Value, Gross Liability |  | 24,499 | 15,693
Derivative Liability, Collateral, Right to Reclaim Cash, Offset |  | 0 | 0
Derivative Liability |  | 24,499 | 15,693
Derivative, Collateral, Right to Reclaim Securities | [1] | 3,626 | 5,383
Derivative, Collateral, Right to Reclaim Cash |  | 93 | 3,939
Derivative Liability, Fair Value, Amount Offset Against Collateral |  | 20,780 | 6,371
Interest rate swaps |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Asset, Collateral, Obligation to Return Cash, Offset |  | 0 | 0
Derivative Asset |  | 3,394 | 1,880
Derivative, Collateral, Obligation to Return Securities | [1] | 1,455 | 805
Derivative, Collateral, Obligation to Return Cash |  | (1,227) | 0
Derivative Asset, Fair Value, Amount Offset Against Collateral |  | 712 | 1,075
Derivative Liability, Collateral, Right to Reclaim Cash, Offset |  | 0 | 0
Derivative Liability |  | 1,516 | 264
Derivative, Collateral, Right to Reclaim Securities | [1] | 1,455 | 0
Derivative, Collateral, Right to Reclaim Cash |  | 61 | 264
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 |  | 21,861 | 14,236
Derivative, Collateral, Obligation to Return Securities | [1] | 2,171 | 4,578
Derivative, Collateral, Obligation to Return Cash |  | (10,123) | 0
Derivative Asset, Fair Value, Amount Offset Against Collateral |  | 9,567 | 9,658
Derivative Liability, Collateral, Right to Reclaim Cash, Offset |  | 0 | 0
Derivative Liability |  | 21,872 | 14,241
Derivative, Collateral, Right to Reclaim Securities | [1] | 2,171 | 5,383
Derivative, Collateral, Right to Reclaim Cash |  | 32 | 3,675
Derivative Liability, Fair Value, Amount Offset Against Collateral |  | 19,669 | 5,183
Customer foreign exchange contracts |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Asset, Collateral, Obligation to Return Cash, Offset |  | 0 | 0
Derivative Asset |  | 1,137 | 1,202
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 |  | 1,137 | 1,202
Derivative Liability, Collateral, Right to Reclaim Cash, Offset |  | 0 | 0
Derivative Liability |  | 1,111 | 1,188
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 |  | 1,111 | 1,188
Other Assets [Member] |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 26,703 | 17,476
Other Assets [Member] | Loan level swaps |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 21,861 | 14,236
Other Assets [Member] | Customer foreign exchange contracts |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 1,137 | 1,202
Other Liabilities [Member] |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 24,499 | 15,693
Other Liabilities [Member] | Loan level swaps |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 21,872 | 14,241
Other Liabilities [Member] | Customer foreign exchange contracts |  |  |
Offsetting Liabilities [Line Items] |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 1,111 | 1,188
Designated as Hedging Instrument [Member] | Other Assets [Member] | Interest rate swaps |  |  |
Offsetting Liabilities [Line Items] |  |  |
Interest Rate Derivative Assets, at Fair Value |  | 3,394 | 1,880
Designated as Hedging Instrument [Member] | Other Liabilities [Member] | Interest rate swaps |  |  |
Offsetting Liabilities [Line Items] |  |  |
Interest Rate Derivative Liabilities, at Fair Value |  | 1,516 | 264
Customer repurchase agreements and other short-term borrowings(f) |  |  |
Offsetting Liabilities [Line Items] |  |  |
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities |  | 0 | 0
Securities Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement |  | 142,235 | 162,679
Securities Sold under Agreements to Repurchase, Asset |  | 0 | 0
Securities Sold under Agreements to Repurchase, Not Subject to Master Netting Arrangement |  | 142,235 | 162,679
Securities Sold under Agreements to Repurchase, Fair Value of Collateral |  | 142,235 | 162,679
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral |  | $ 0 | $ 0
[1] | Reflects offsetting derivative positions with the same counterparty.

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