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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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