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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 203,395	$ 172,263
Gross Unrealized Gains	1,542	295
Gross Unrealized Losses	(522)	(4,111)
Fair Value	204,415	168,447
U.S. Treasury [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	24,838	23,078
Gross Unrealized Gains	13	6
Gross Unrealized Losses	(56)	(254)
Fair Value	24,795	22,830
U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	95,437	71,235
Gross Unrealized Gains	653	2
Gross Unrealized Losses	(146)	(1,910)
Fair Value	95,944	69,327
Mortgage-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	44,763	37,342
Gross Unrealized Gains	322	62
Gross Unrealized Losses	(259)	(1,142)
Fair Value	44,826	36,262
State and Local Governments [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	38,357	40,608
Gross Unrealized Gains	554	225
Gross Unrealized Losses	(61)	(805)
Fair Value	$ 38,850	$ 40,028

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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