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Derivative Financial Instruments - Notional Amounts and Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Asset Derivatives
Notional Amount	$ 576,012	$ 44,294
Fair Value	8,542	554
Derivative Liability [Abstract]
Notional Amount	37,588	174,359
Derivative, fair value	(72)	(354)
Interest Rate Lock Commitments
Derivative Liability [Abstract]
Derivative, fair value	383	551
Derivatives designated as hedging instruments | Interest rate swaps
Derivative Liability [Abstract]
Notional Amount	426,442	141,135
Derivatives not designated as hedging instruments | Interest Rate Lock Commitments
Asset Derivatives
Notional Amount	26,658	26,394
Fair Value	383	551
Derivatives not designated as hedging instruments | Forward contracts
Asset Derivatives
Notional Amount	30,500	0
Fair Value	127	0
Derivatives not designated as hedging instruments | Forward contracts
Derivative Liability [Abstract]
Notional Amount	0	51,124
Fair Value	0	(80)
Loans | Derivatives designated as hedging instruments | Interest rate swaps
Asset Derivatives
Notional Amount	300,654	17,900
Fair Value	5,265	3
Derivative Liability [Abstract]
Notional Amount	338,242	91,135
Loans | Derivatives designated as hedging instruments | Forward contracts
Derivative Liability [Abstract]
Notional Amount	37,588	73,235
Fair Value	(72)	(266)
Securities available-for-sale | Derivatives designated as hedging instruments | Interest rate swaps
Asset Derivatives
Notional Amount	88,200	0
Fair Value	2,359	0
Derivative Liability [Abstract]
Notional Amount	88,200	50,000
Securities available-for-sale | Derivatives designated as hedging instruments | Forward contracts
Derivative Liability [Abstract]
Notional Amount	0	50,000
Fair Value	0	(8)
Liability | Derivatives designated as hedging instruments | Interest rate swaps
Asset Derivatives
Notional Amount	130,000	0
Fair Value	$ 408	$ 0

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

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: 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

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-Publisher FASB
-Name Accounting Standards Codification
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Fair value, after offset of derivative liability, of 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, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: 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=82849420&loc=SL20226008-175313

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Fair value, after offset of derivative asset, of 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, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

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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
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-Name Accounting Standards Codification
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Nominal or face amount used to calculate payments on the derivative liability.

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-Publisher FASB
-Name Accounting Standards Codification
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