Fair Value of Assets and Liabilities - Schedule of Trust Preferred Securities Measured at Fair Value on a Recurring Basis (Detail) - Trust Preferred Securities [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Balance at beginning of period	$ 1,865	$ 1,685	$ 1,817
Accretion included in net income	4	4	13
Unrealized gains (loss) included in comprehensive income	(152)	294	(113)
Call of security - book value		(1,658)
Realized gain on call of security		$ (325)
Balance at end of period	$ 1,717		$ 1,717

Fair value assets and liabilities measured on nonrecurring basis.

No definition available.

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- Definition

Fair value net derivative asset liability measured on recurring basis unobservable inputs reconciliation realized gain loss on repurchase of security.

+ References

No definition available.

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- Definition

Fair value net derivative asset liability measured on recurring basis unobservable inputs reconciliation repurchase of security.

+ References

No definition available.

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- Definition

Amount of gain (loss) recognized in the income statement of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 820
-SubTopic 10
-Section 50
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- Definition

Amount of gain (loss) recognized in other comprehensive income (loss) of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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- Definition

Fair value of financial instrument classified as derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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