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Fair Value Measurements - Financial Assets and Financial Liabilities Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available-for-sale, at estimated fair value $ 122,558 $ 100,717
Equity investments 9,816 9,655
Interest rate swap liability 3,000 1,800
Items Measured on a Recurring Basis | Investment securities - U.S. government and agency obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available-for-sale, at estimated fair value 122,558 100,717
Items Measured on a Recurring Basis | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments 9,816 9,655
Items Measured on a Recurring Basis | Interest rate swap asset    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap asset 2,902 1,722
Items Measured on a Recurring Basis | Interest rate swap liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap liability (3,047) (1,813)
Items Measured on a Recurring Basis | Level 1 Inputs | Investment securities - U.S. government and agency obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available-for-sale, at estimated fair value 0 0
Items Measured on a Recurring Basis | Level 1 Inputs | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments 9,816 9,655
Items Measured on a Recurring Basis | Level 1 Inputs | Interest rate swap asset    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap asset 0 0
Items Measured on a Recurring Basis | Level 1 Inputs | Interest rate swap liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap liability 0 0
Items Measured on a Recurring Basis | Level 2 Inputs | Investment securities - U.S. government and agency obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available-for-sale, at estimated fair value 122,558 100,717
Items Measured on a Recurring Basis | Level 2 Inputs | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments 0 0
Items Measured on a Recurring Basis | Level 2 Inputs | Interest rate swap asset    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap asset 2,902 1,722
Items Measured on a Recurring Basis | Level 2 Inputs | Interest rate swap liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap liability (3,047) (1,813)
Items Measured on a Recurring Basis | Level 3 Inputs | Investment securities - U.S. government and agency obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Debt securities available-for-sale, at estimated fair value 0 0
Items Measured on a Recurring Basis | Level 3 Inputs | Equity investments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity investments 0 0
Items Measured on a Recurring Basis | Level 3 Inputs | Interest rate swap asset    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap asset 0 0
Items Measured on a Recurring Basis | Level 3 Inputs | Interest rate swap liability    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swap liability 0 0
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 1,594 1,381
Items Measured on a Non-Recurring Basis | Loans measured for impairment based on the fair value of the underlying collateral    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 9,199 11,639
Items Measured on a Non-Recurring Basis | Level 1 Inputs | Other real estate owned    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 0 0
Items Measured on a Non-Recurring Basis | Level 1 Inputs | Loans measured for impairment based on the fair value of the underlying collateral    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 0 0
Items Measured on a Non-Recurring Basis | Level 2 Inputs | Other real estate owned    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 0 0
Items Measured on a Non-Recurring Basis | Level 2 Inputs | Loans measured for impairment based on the fair value of the underlying collateral    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 0 0
Items Measured on a Non-Recurring Basis | Level 3 Inputs | Other real estate owned    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 1,594 1,381
Items Measured on a Non-Recurring Basis | Level 3 Inputs | Loans measured for impairment based on the fair value of the underlying collateral    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value $ 9,199 $ 11,639