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Derivative Instruments and Hedging Activities - Value of Derivative Assets and Derivative Liabilities (Details) - Not Designated as Hedging Instruments - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
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Other Assets |  |
Derivatives not Designated as Hedging Instruments |  |
Fair value, Derivatives (included in Other Assets) | $ 10,645,000 | $ 5,504,000
Other Assets | Interest rate swap contracts—commercial loans |  |
Derivatives not Designated as Hedging Instruments |  |
Fair value, Derivatives (included in Other Assets) | 10,645,000 | 5,504,000
Notional amount, Derivatives (included in Other Assets) | 367,258,000 | 325,750,000
Collateral received/posted, Derivatives (included in Other Assets) | 0 | 160,000
Other Assets | Interest rate lock commitments—mortgage loans |  |
Derivatives not Designated as Hedging Instruments |  |
Fair value, Derivatives (included in Other Assets) | 339,000 | 251,000
Notional amount, Derivatives (included in Other Assets) | 10,554,000 | 6,054,000
Other Assets | Forward sale contracts—mortgage loans |  |
Derivatives not Designated as Hedging Instruments |  |
Fair value, Derivatives (included in Other Assets) | 88,000 | 55,000
Notional amount, Derivatives (included in Other Assets) | 9,375,000 | 6,000,000
Other Liabilities |  |
Derivatives not Designated as Hedging Instruments |  |
Fair value, Derivatives (included in Other Liabilities) | 10,602,000 | 5,340,000
Other Liabilities | Interest rate swap contracts—commercial loans |  |
Derivatives not Designated as Hedging Instruments |  |
Fair value, Derivatives (included in Other Liabilities) | 10,602,000 | 5,340,000
Notional amount, Derivatives (included in Other Liabilities) | 367,258,000 | 325,750,000
Collateral received/posted, Derivatives (included in Other Liabilities) | 10,053,000 | 0
Other Liabilities | Interest rate lock commitments—mortgage loans |  |
Derivatives not Designated as Hedging Instruments |  |
Fair value, Derivatives (included in Other Liabilities) | 0 | 0
Notional amount, Derivatives (included in Other Liabilities) | 0 | 0
Other Liabilities | Forward sale contracts—mortgage loans |  |
Derivatives not Designated as Hedging Instruments |  |
Fair value, Derivatives (included in Other Liabilities) | 0 | 0
Notional amount, Derivatives (included in Other Liabilities) | $ 0 | $ 0

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or 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 liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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