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Fair Value - Summary of financial assets measured at fair value on a recurring basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities | $ 121,740 | $ 38,047
Fair Value, Recurring [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities | 121,740 | 38,047
Fair Value, Recurring [Member] | U.S. Treasury and agencies [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities | 3,331 | 3,167
Fair Value, Recurring [Member] | Mortgage backed securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities | 111,790 | 28,370
Fair Value, Recurring [Member] | Corporate bonds [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities | 6,619 | 5,507
Fair Value, Recurring [Member] | State and municipal [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities |  | 1,003
Fair Value, Recurring [Member] | Level 2 [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities | 121,740 | 38,047
Fair Value, Recurring [Member] | Level 2 [Member] | U.S. Treasury and agencies [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities | 3,331 | 3,167
Fair Value, Recurring [Member] | Level 2 [Member] | Mortgage backed securities |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities | 111,790 | 28,370
Fair Value, Recurring [Member] | Level 2 [Member] | Corporate bonds [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities | $ 6,619 | 5,507
Fair Value, Recurring [Member] | Level 2 [Member] | State and municipal [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Available for sale securities |  | $ 1,003

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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