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Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Fair Values, Assets |  | $ 1,352 | $ 224
Fair Values, Liabilities |  | 36,267 | 21,034
Derivatives Designated as Hedging Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amounts |  | 1,100,000 | 500,000
Fair Values, Assets | [1] | 1,135 |
Fair Values, Liabilities | [1] | 254 | 281
Derivatives Not Designated as Hedging Instruments [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amounts |  | 1,185,453 | 1,002,350
Fair Values, Assets | [1] | 35,419 | 23,251
Fair Values, Liabilities | [1] | 37,645 | 23,687
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amounts | [2] | 905,662 | 780,871
Fair Values, Assets | [1],[2] | 33,732 | 20,622
Fair Values, Liabilities | [1],[2] | 35,447 | 21,007
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amounts |  | 86,839 | 83,430
Fair Values, Assets | [1] | 97 | 83
Fair Values, Liabilities | [1] | 215 | 162
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amounts |  | 102,495 | 55,128
Fair Values, Assets | [1] | 88 | 263
Fair Values, Liabilities | [1] | 997 | 336
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amounts |  | 60,757 | 38,853
Fair Values, Assets | [1] | 532 | 243
Fair Values, Liabilities | [1] | 33 | 167
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amounts |  | 29,700 | 44,068
Fair Values, Assets | [1] | 970 | 2,040
Fair Values, Liabilities | [1] | 953 | 2,015
Cash Flow Hedge [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amounts |  | 1,100,000 | 500,000
Fair Values, Assets | [1] | 1,135 |
Fair Values, Liabilities | [1] | $ 254 | $ 281
[1] | Derivative assets and liabilities are reported with other assets or other liabilities, respectively, in the consolidated balance sheets.
[2] | 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=49121117&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=49121117&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=51825145&loc=SL20226008-175313 + Details
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