Fair Value Measurements - Financial Assets and Financial Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	$ 47,104	$ 12,224
Items Measured on a Recurring Basis | U.S. Agency Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	47,104	12,224
Items Measured on a Non-Recurring Basis | Other Real Estate Owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	8,774	9,803
Items Measured on a Non-Recurring Basis | Loans Measured for Impairment Based on the Fair Value of Underlying Collateral
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	6,237	2,419
Level 2 Inputs | Items Measured on a Recurring Basis | U.S. Agency Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities available for sale	47,104	12,224
Level 3 Inputs | Items Measured on a Non-Recurring Basis | Other Real Estate Owned
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	8,774	9,803
Level 3 Inputs | Items Measured on a Non-Recurring Basis | Loans Measured for Impairment Based on the Fair Value of Underlying Collateral
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value	$ 6,237	$ 2,419