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Fair Value Measurements - Financial Assets and Financial Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available-for-sale, fair value | $ 100,717 | $ 81,581
Items measured on a recurring basis | U.S. Agency Obligations |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities available-for-sale, fair value | 100,717 | 81,581
Items measured on a recurring basis | Equity investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity investments | 9,655 | 8,700
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 | 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 | (1,813) |
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 | 1,381 | 8,186
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 | 11,639 | 16,496
Level 1 Inputs | Items measured on a recurring basis | Equity investments |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity investments | 9,655 | 8,700
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] |  |
Debt securities available-for-sale, fair value | 100,717 | 81,581
Level 2 Inputs | 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 | 1,722 |
Level 2 Inputs | 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 | (1,813) |
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 | 1,381 | 8,186
Level 3 Inputs | 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 | $ 11,639 | $ 16,496

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