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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	$ (2)	$ (26)
Fair Value, Less Than Twelve Months	6,801	3,951
Gross Unrealized Losses, Twelve Months and Over	(520)	(4,085)
Fair Value, Twelve Months and Over	93,762	145,348
Gross Unrealized Losses, Total	(522)	(4,111)
Fair Value, Total	100,563	149,299
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	(1)
Fair Value, Less Than Twelve Months	1,797
Gross Unrealized Losses, Twelve Months and Over	(55)	(254)
Fair Value, Twelve Months and Over	21,008	20,861
Gross Unrealized Losses, Total	(56)	(254)
Fair Value, Total	22,805	20,861
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	(1)
Fair Value, Less Than Twelve Months	5,004
Gross Unrealized Losses, Twelve Months and Over	(145)	(1,910)
Fair Value, Twelve Months and Over	38,489	64,727
Gross Unrealized Losses, Total	(146)	(1,910)
Fair Value, Total	43,493	64,727
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, Less Than Twelve Months		(4)
Fair Value, Less Than Twelve Months		697
Gross Unrealized Losses, Twelve Months and Over	(259)	(1,138)
Fair Value, Twelve Months and Over	25,712	30,347
Gross Unrealized Losses, Total	(259)	(1,142)
Fair Value, Total	25,712	31,044
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses, Less Than Twelve Months		(22)
Fair Value, Less Than Twelve Months		3,254
Gross Unrealized Losses, Twelve Months and Over	(61)	(783)
Fair Value, Twelve Months and Over	8,553	29,413
Gross Unrealized Losses, Total	(61)	(805)
Fair Value, Total	$ 8,553	$ 32,667

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- Definition

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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Amount of accumulated unrealized loss on 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 12 months or longer.

+ References

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