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Derivative Financial Instruments - Interest Swap Derivatives (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Notional Value | $ 37,588 |  | $ 37,588 |  | $ 174,359
Fair Value | (72) |  | (72) |  | (354)
Interest expense | 14,253 | $ 8,503 | 36,772 | $ 21,437 |
Interest rate swaps |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Interest expense | 125 | $ 0 | 140 | $ 0 |
Interest rate swaps | Derivatives designated as hedging instruments |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Notional Value | $ 426,442 |  | $ 426,442 |  | $ 141,135
Weighted Average Remaining Maturity (years) |  |  | 6 years 4 months 24 days |  | 7 years 6 months
Fair Value |  |  | $ 7,552 |  | $ (271)
Weighted-Average Rate | 2.78% |  | 2.78% |  | 2.41%
Cash collateral received |  |  |  |  | $ 8,000
Cash collateral pledged |  |  |  |  | 700
Loans | Derivatives designated as hedging instruments |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Fair Value |  |  | $ (5,152) |  | 263
Loans | Interest rate swaps | Derivatives designated as hedging instruments |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Notional Value | $ 338,242 |  | $ 338,242 |  | $ 91,135
Weighted Average Remaining Maturity (years) |  |  | 6 years 7 months 6 days |  | 7 years 10 months 24 days
Fair Value |  |  | $ 5,193 |  | $ (263)
Weighted-Average Rate | 2.84% |  | 2.84% |  | 2.44%
Securities available-for-sale | Derivatives designated as hedging instruments |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Fair Value |  |  | $ (2,339) |  | $ 8
Securities available-for-sale | Interest rate swaps | Derivatives designated as hedging instruments |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Notional Value | $ 88,200 |  | $ 88,200 |  | $ 50,000
Weighted Average Remaining Maturity (years) |  |  | 5 years 4 months 24 days |  | 6 years 9 months 18 days
Fair Value |  |  | $ 2,359 |  | $ (8)
Weighted-Average Rate | 2.54% |  | 2.54% |  | 2.33%
3 month LIBOR | Interest rate swaps | Derivatives designated as hedging instruments |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Notional Value | $ 50,000 |  | $ 50,000 |  |
Weighted Average Remaining Maturity (years) |  |  | 9 years 8 months 12 days |  |
Fair Value | $ 234 |  | $ 234 |  |
Derivative, variable interest rate | 3.01% |  | 3.01% |  |
1 month LIBOR | Interest rate swaps | Derivatives designated as hedging instruments |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Notional Value | $ 80,000 |  | $ 80,000 |  |
Weighted Average Remaining Maturity (years) |  |  | 5 years 2 months 12 days |  |
Fair Value | $ 174 |  | $ 174 |  |
Derivative, variable interest rate | 2.86% |  | 2.86% |  |

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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 Average fixed interest rate related to the group of interest rate derivatives. + References No definition available. + Details
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- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226016-175313 + Details
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- Definition Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226016-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959 + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: 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 2: 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 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 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Variable interest rate in effect as of the balance sheet date related to the interest rate derivative. + References No definition available. + Details
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