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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%

X

- 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

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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

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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

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

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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.

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- Definition

Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

+ References

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- Definition

The increase (decrease) during the period in the carrying value of derivative instruments reported as assets that are due to be disposed of within one year (or the normal operating cycle, if longer).

+ References

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- Definition

Amount of the cost of borrowed funds accounted for as interest expense.

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-SubTopic 20
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