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Derivative Financial Instruments - Fair Value of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	$ 5,173	$ 954
Total Liability Derivatives	5,010	2,542
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	4,942	811
Total Liability Derivatives	4,918	2,539
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts One [Member] | Loans [Member]
Derivatives, Fair Value [Line Items]
Total Liability Derivatives	4,918	811
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts One [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	4,918
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts Two [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total Liability Derivatives		1,728
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts Two [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	24	811
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	231	143
Total Liability Derivatives	92	3
Derivatives Not Designated as Hedging Instruments [Member] | Mortgage Loan Contracts [Member] | Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Total Liability Derivatives	92	3
Derivatives Not Designated as Hedging Instruments [Member] | Mortgage Loan Contracts [Member] | Other Assets [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	$ 231	$ 143

X

- Definition

Fair value, before 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 elected not to be offset. Excludes assets not subject to a master netting arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313

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-Section 50
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(c)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

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X

- Definition

Fair value, before 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 elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4D
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No definition available.

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