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Fair Value - Summary of Financial Assets Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available for sale securities	$ 108,571	$ 38,047
Fair Value, Recurring [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available for sale securities	108,571	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	2,449	3,167
Fair Value, Recurring [Member] | Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available for sale securities	95,485	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	10,637	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	108,571	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	2,449	3,167
Fair Value, Recurring [Member] | Level 2 [Member] | Mortgage Backed Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Available for sale securities	95,485	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	$ 10,637	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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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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- Definition

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