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Securities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018 USD ($) security	Dec. 31, 2017 USD ($) security	Dec. 31, 2016 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Number of securities holdings | security	0	0
Shareholders equity, percentage	10.00%	10.00%
Amortized cost	$ 521,337,000	$ 409,110,000
Proceeds	0	16,340,000	$ 4,420,000
Tax provision related to net realized gains	0	540,000	352,000
Proceeds from sale of trading securities	455,000	1,091,000	540,000
Net realized gains on trading securities	151,000	$ 93,000	$ 70,000
Pooled trust preferred
Debt Securities, Available-for-sale [Line Items]
Number of securities holdings | security		2	2
Amortized cost		$ 800,000	$ 0
Proceeds		1,383,000	$ 922,000
Collateral Pledged
Debt Securities, Available-for-sale [Line Items]
Securities pledged to public deposits	$ 290,717,000	$ 319,575,000

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Number of securities holdings.

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Shareholders equity percentage.

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Tax provision related to net realized gains.

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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

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-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

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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-Section 45
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Cash received from sale of investments in debt and equity securities, classified as operating activities, during the period; includes trading securities and any other investments classified as operating.

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Amount of gain (loss) realized from securities classified as trading.

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