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Derivative Instruments and Hedging Activities (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) Agreement | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Amount reclassified from AOCI, before tax | $ 609 | $ 2,901 | $ 0
Amount reclassified from AOCI, net of tax | 372 | 1,772 | 0
Derivatives Not Designated as Hedging Instruments [Member] |  |  |
Credit value adjustment recorded related to notional amount of derivatives outstanding and notional amount of risk participation agreements [Abstract] |  |  |
Fair value adjustment | 210 | 309 |
Derivatives Not Designated as Hedging Instruments [Member] | Interest Income [Member] |  |  |
Gain or loss recognized in income on derivatives [Abstract] |  |  |
Gain (loss) recognized in income on derivatives | 179 | 95 | 33
Derivatives Not Designated as Hedging Instruments [Member] | Other Income [Member] |  |  |
Gain or loss recognized in income on derivatives [Abstract] |  |  |
Gain (loss) recognized in income on derivatives | $ 2,945 | 3,480 | 684
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Derivatives [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Number of risk participation agreements held | Agreement | 7 |  |
Credit value adjustment recorded related to notional amount of derivatives outstanding and notional amount of risk participation agreements [Abstract] |  |  |
Notional amount | $ 481,185 | 371,101 |
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member] |  |  |
Credit value adjustment recorded related to notional amount of derivatives outstanding and notional amount of risk participation agreements [Abstract] |  |  |
Notional amount | 35,628 | 11,421 |
Derivatives Designated as Hedging Instruments [Member] | Interest Expense [Member] |  |  |
Gain or loss recognized in income on derivatives [Abstract] |  |  |
Gain (loss) recognized in income on derivatives | 289 | (70) | $ 0
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Derivatives [Member] |  |  |
Credit value adjustment recorded related to notional amount of derivatives outstanding and notional amount of risk participation agreements [Abstract] |  |  |
Fair value adjustment | 3,510 | 2,704 |
Notional amount | $ 250,000 | $ 250,000 |

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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 Amount of credit risk valuation adjustment to derivative assets to properly reflect the credit quality of the counterparties. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Number of interest rate derivative instruments held by the entity at the reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + Details
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- Definition Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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- Definition Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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