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Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Derivatives, Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | $ 2,928,478 | $ 2,799,296
Fair Values, Assets |  | 6,751 | 2,148
Fair Values, Liabilities |  | 309 | 3,938
Less: netting adjustment, Assets | [1],[2] | (19,557) | (4,913)
Less: netting adjustment, Liabilities | [1],[2] | (28,586) | (21,563)
Derivatives Designated as Hedging Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 1,358,110 | 1,358,110
Derivatives Not Designated as Hedging Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 1,570,368 | 1,441,186
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional or Contractual Amount | [3] | 1,223,626 | 1,144,789
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 173,066 | 119,951
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 79,432 | 80,462
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 55,502 | 53,724
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 38,742 | 42,260
Other Assets [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 30,968 | 19,070
Total derivative assets/liabilities | [1] | 11,411 | 14,157
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 30,968 | 19,070
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Values, Assets | [1],[3] | 28,397 | 15,408
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 5 | 23
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 882 | 1,000
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 227 | 186
Other Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Values, Assets | [1] | 1,457 | 2,453
Other Liabilities [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 57,377 | 35,952
Total derivative assets/liabilities | [1] | 28,791 | 14,389
Other Liabilities [Member] | Derivatives Designated as Hedging Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 26,539 | 16,495
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 30,838 | 19,457
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1],[3] | 28,239 | 15,857
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 56 | 109
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 330 | 290
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 784 | 782
Other Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 1,429 | 2,419
Cash Flow Hedge [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 875,000 | 875,000
Cash Flow Hedge [Member] | Other Liabilities [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | 23,131 | 14,020
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional or Contractual Amount |  | 483,110 | 483,110
Fair Value Hedging [Member] | Other Liabilities [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair Values, Liabilities | [1] | $ 3,408 | $ 2,475
[1] | Derivative assets and liabilities are reported at fair value in other assets or other liabilities, respectively, in the consolidated balance sheets.
[2] | Represents balance sheet netting of derivative assets and liabilities for variation margin collateral held or placed with the same central clearing counterparty. See offsetting assets and liabilities for further information.
[3] | The notional amount represents both the customer accommodation agreements and offsetting agreements with unrelated financial institutions.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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