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Securities - Securities with Unrealized Losses Not Recognized in Income (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
12 Months or less, Fair Value		$ 14,638
12 Months or less, Unrealized Loss		(161)
More than 12 months, Fair Value	$ 54,977	82,692
More than 12 months, Unrealized Loss	(776)	(1,774)
Total Fair Value	54,977	97,330
Total Unrealized Loss	(776)	(1,935)
U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
More than 12 months, Fair Value	11,486	16,469
More than 12 months, Unrealized Loss	(76)	(140)
Total Fair Value	11,486	16,469
Total Unrealized Loss	(76)	(140)
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
12 Months or less, Fair Value		8,008
12 Months or less, Unrealized Loss		(71)
More than 12 months, Fair Value	5,907	25,890
More than 12 months, Unrealized Loss	(81)	(531)
Total Fair Value	5,907	33,898
Total Unrealized Loss	(81)	(602)
Mortgage-backed Securities in Government Sponsored Entities [Member]
Schedule of Available-for-sale Securities [Line Items]
12 Months or less, Fair Value		6,630
12 Months or less, Unrealized Loss		(90)
More than 12 months, Fair Value	37,584	40,333
More than 12 months, Unrealized Loss	(619)	(1,103)
Total Fair Value	37,584	46,963
Total Unrealized Loss	$ (619)	$ (1,193)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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