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Investment Securities - Summary Information Regarding Investment Securities Classified as Available for Sale and Held to Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Securities available for sale, Amortized Cost	$ 256,445	$ 262,923
Securities available for sale, Gross Unrealized Gains	1,959	695
Securities available for sale, Gross Unrealized Losses, Less Than 1 Year	652	367
Gross unrealized losses, Over 1 Year	431	3,120
Investment securities available for sale, at fair value	257,321	260,131
Securities held to maturity, Amortized Cost	7,149	10,872
Securities held to maturity, Gross Unrealized Gains	45	11
Securities held to maturity, Gross unrealized losses, Less Than 1 Year	0	5
Securities held to maturity, Gross unrealized losses, Over 1 Year	0	37
Investment securities held to maturity	7,194	10,841
U.S. agency mortgage-backed
Debt Securities, Available-for-sale [Line Items]
Securities available for sale, Amortized Cost	94,446	86,487
Securities available for sale, Gross Unrealized Gains	1,081	485
Securities available for sale, Gross Unrealized Losses, Less Than 1 Year	292	171
Gross unrealized losses, Over 1 Year	63	892
Investment securities available for sale, at fair value	95,172	85,909
Collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Securities available for sale, Amortized Cost	142,408	145,814
Securities available for sale, Gross Unrealized Gains	701	129
Securities available for sale, Gross Unrealized Losses, Less Than 1 Year	300	161
Gross unrealized losses, Over 1 Year	358	2,191
Investment securities available for sale, at fair value	142,451	143,591
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Securities available for sale, Amortized Cost	15,895	21,453
Securities available for sale, Gross Unrealized Gains	166	52
Securities available for sale, Gross Unrealized Losses, Less Than 1 Year	56	16
Gross unrealized losses, Over 1 Year	0	12
Investment securities available for sale, at fair value	16,005	21,477
Securities held to maturity, Amortized Cost	7,149	10,872
Securities held to maturity, Gross Unrealized Gains	45	11
Securities held to maturity, Gross unrealized losses, Less Than 1 Year	0	5
Securities held to maturity, Gross unrealized losses, Over 1 Year	0	37
Investment securities held to maturity	7,194	10,841
U.S. government agency
Debt Securities, Available-for-sale [Line Items]
Securities available for sale, Amortized Cost	3,696	9,169
Securities available for sale, Gross Unrealized Gains	11	29
Securities available for sale, Gross Unrealized Losses, Less Than 1 Year	4	19
Gross unrealized losses, Over 1 Year	10	25
Investment securities available for sale, at fair value	$ 3,693	$ 9,154

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- 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).

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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).

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