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Securities - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Shareholders' equity percentage (greater than)			10.00%	10.00%
Securities pledged to secure public deposits			$ 299,939	$ 319,575
Tax provision related to net realized gains	$ 54	$ 538

X

- Definition

Shareholders equity percentage.

+ References

No definition available.

+ Details

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X

- Definition

Tax provision related to net realized gains.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Amount of restricted investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729

+ Details

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Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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