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Investment Securities - Amortized Cost and Estimated Fair Value by Maturity of Company's Investment Securities (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt and Equity Securities, FV-NI [Line Items]
Securities available for sale, One Year or Less, Fair Value	$ 2,963
Securities available for sale, One Year to Five Years, Fair Value	28,871
Securities available for sale, Five to Ten Years, Fair Value	94,564
Securities available for sale, Over Ten Years, Fair Value	130,923
Total available for sale, Fair Value	257,321	$ 260,131
Securities held to maturity, One Year or Less, Fair Value	0
Securities held to maturity, One Year to Five Years, Fair Value	2,970
Securities held to maturity, Five to Ten Years, Fair Value	4,224
Securities held to maturity, Over Ten Years, Fair Value	0
Total held to maturity, Fair Value	7,194	10,841
Securities available for sale, Amortized Cost, One Year or Less	2,959
Securities available for sale, Amortized Cost, One Year to Five Years	28,751
Securities available for sale, Amortized Cost, Five to Ten Years	94,065
Securities available for sale, Amortized Cost, Over Ten Years	130,670
Securities available for sale, Amortized Cost	256,445	262,923
Securities held to maturity, Amortized Cost, One Year or Less	0
Securities held to maturity, Amortized Cost, One Year to Five Years	2,961
Securities held to maturity, Amortized Cost, Five to Ten Years	4,188
Securities held to maturity, Amortized Cost, Over Ten Years	0
Securities held to maturity, Amortized Cost	7,149	10,872
U.S. agency mortgage-backed
Debt and Equity Securities, FV-NI [Line Items]
Securities available for sale, One Year or Less, Fair Value	66
Securities available for sale, One Year to Five Years, Fair Value	16,306
Securities available for sale, Five to Ten Years, Fair Value	50,888
Securities available for sale, Over Ten Years, Fair Value	27,912
Total available for sale, Fair Value	95,172	85,909
Securities available for sale, Amortized Cost, One Year or Less	64
Securities available for sale, Amortized Cost, One Year to Five Years	16,222
Securities available for sale, Amortized Cost, Five to Ten Years	50,789
Securities available for sale, Amortized Cost, Over Ten Years	27,371
Securities available for sale, Amortized Cost	94,446	86,487
Collateralized mortgage obligations
Debt and Equity Securities, FV-NI [Line Items]
Securities available for sale, One Year or Less, Fair Value	1,689
Securities available for sale, One Year to Five Years, Fair Value	5,356
Securities available for sale, Five to Ten Years, Fair Value	34,269
Securities available for sale, Over Ten Years, Fair Value	101,137
Total available for sale, Fair Value	142,451	143,591
Securities available for sale, Amortized Cost, One Year or Less	1,688
Securities available for sale, Amortized Cost, One Year to Five Years	5,356
Securities available for sale, Amortized Cost, Five to Ten Years	33,894
Securities available for sale, Amortized Cost, Over Ten Years	101,470
Securities available for sale, Amortized Cost	142,408	145,814
Municipal bonds
Debt and Equity Securities, FV-NI [Line Items]
Securities available for sale, One Year or Less, Fair Value	1,208
Securities available for sale, One Year to Five Years, Fair Value	7,209
Securities available for sale, Five to Ten Years, Fair Value	6,180
Securities available for sale, Over Ten Years, Fair Value	1,408
Total available for sale, Fair Value	16,005	21,477
Securities held to maturity, One Year or Less, Fair Value	0
Securities held to maturity, One Year to Five Years, Fair Value	2,970
Securities held to maturity, Five to Ten Years, Fair Value	4,224
Securities held to maturity, Over Ten Years, Fair Value	0
Total held to maturity, Fair Value	7,194	10,841
Securities available for sale, Amortized Cost, One Year or Less	1,207
Securities available for sale, Amortized Cost, One Year to Five Years	7,173
Securities available for sale, Amortized Cost, Five to Ten Years	6,162
Securities available for sale, Amortized Cost, Over Ten Years	1,353
Securities available for sale, Amortized Cost	15,895	21,453
Securities held to maturity, Amortized Cost, One Year or Less	0
Securities held to maturity, Amortized Cost, One Year to Five Years	2,961
Securities held to maturity, Amortized Cost, Five to Ten Years	4,188
Securities held to maturity, Amortized Cost, Over Ten Years	0
Securities held to maturity, Amortized Cost	7,149	10,872
U.S. government agency
Debt and Equity Securities, FV-NI [Line Items]
Securities available for sale, One Year or Less, Fair Value	0
Securities available for sale, One Year to Five Years, Fair Value	0
Securities available for sale, Five to Ten Years, Fair Value	3,227
Securities available for sale, Over Ten Years, Fair Value	466
Total available for sale, Fair Value	3,693	9,154
Securities available for sale, Amortized Cost, One Year or Less	0
Securities available for sale, Amortized Cost, One Year to Five Years	0
Securities available for sale, Amortized Cost, Five to Ten Years	3,220
Securities available for sale, Amortized Cost, Over Ten Years	476
Securities available for sale, Amortized Cost	$ 3,696	$ 9,169

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Amount of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)(1)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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Period Type:

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- Details

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