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Investment Securities - Summary of amortized cost and fair values of investment securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Available for sale, Amortized Cost	$ 120,148	$ 38,828
Available for sale, Gross Unrealized Gains	1,710	103
Available for sale, Gross Unrealized Losses	118	884
Available for sale, Fair Value	121,740	38,047
Held to maturity, Amortized Cost	13,117	15,565
Held to maturity, Gross Unrealized Gains	506	78
Held to maturity, Gross Unrealized Losses	8	140
Held to maturity, Fair Value	13,615	15,503
Investment Securities, Amortized Cost	133,265	54,393
Investment Securities, Gross Unrealized Gains	2,216	181
Investment Securities, Gross Unrealized Losses	126	1,024
Investment Securities, Fair Value	135,355	53,550
U.S. Treasury and agencies [Member]
Debt Securities, Available-for-sale [Line Items]
Available for sale, Amortized Cost	3,375	3,375
Available for sale, Gross Unrealized Gains	2
Available for sale, Gross Unrealized Losses	46	208
Available for sale, Fair Value	3,331	3,167
Mortgage backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available for sale, Amortized Cost	110,220	28,976
Available for sale, Gross Unrealized Gains	1,640	22
Available for sale, Gross Unrealized Losses	70	628
Available for sale, Fair Value	111,790	28,370
Corporate bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Available for sale, Amortized Cost	6,553	5,477
Available for sale, Gross Unrealized Gains	68	78
Available for sale, Gross Unrealized Losses	2	48
Available for sale, Fair Value	6,619	5,507
State and municipal [Member]
Debt Securities, Available-for-sale [Line Items]
Available for sale, Amortized Cost		1,000
Available for sale, Gross Unrealized Gains		3
Available for sale, Fair Value		1,003
Held to maturity, Amortized Cost	13,117	15,565
Held to maturity, Gross Unrealized Gains	506	78
Held to maturity, Gross Unrealized Losses	8	140
Held to maturity, Fair Value	$ 13,615	$ 15,503

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