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Derivatives and Hedging Activities (FV of Derivative Financial Instruments and Classification on Balance Sheet) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | $ 26,392 | $ 17,318
Liability Derivatives | 24,499 | 15,693
Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Instruments Not Designated as Hedging Instruments, Asset, at Fair Value | 23,309 | 15,596
Derivative Asset, Fair Value, Gross Asset | 26,703 | 17,476
Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Instruments Not Designated as Hedging Instruments, Liability, at Fair Value | 22,983 | 15,429
Liability Derivatives | 24,499 | 15,693
Interest rate swaps [Member] | Derivatives designated as hedges [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Interest Rate Derivative Assets, at Fair Value | 3,394 | 1,880
Interest rate swaps [Member] | Derivatives designated as hedges [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Interest Rate Derivative Liabilities, at Fair Value | 1,516 | 264
Loan level swaps [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 21,861 | 14,236
Loan level swaps [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 21,872 | 14,241
Foreign exchange contracts | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Gross Asset | 1,137 | 1,202
Foreign exchange contracts | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liability Derivatives | 1,111 | 1,188
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Instrument Not Designated as a Hedge, Interest Rate Lock Commitments, Asset at Fair Value | 231 | 149
Derivative Instrument Not Designated as a Hedge, Forward Sales Agreements, Asset at Fair Value | 80 | 9
Interest Rate Lock Commitments [Member] | Not Designated as Hedging Instrument | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Instrument Not Designated as a Hedge, Interest Rate Lock Commitments, Liabilities at Fair Value | 0 | 0
Derivative Instrument Not Designated as a Hedge, Forward Sales Agreements, Liabilities at Fair Value | $ 0 | $ 0

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- Definition Fair value, before 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 elected not to be offset. Excludes assets not subject to a master netting arrangement. + 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 (a) -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 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=SL51823488-111719 + Details
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