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Fair Value - Summary of Financial Assets Measured at Fair Value on a Recurring Basis (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available for sale securities $ 104,481 $ 108,571
Fair Value, Recurring [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available for sale securities 104,481 108,571
Fair Value, Recurring [Member] | State and Municipal [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available for sale securities 12,265  
Fair Value, Recurring [Member] | Mortgage Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available for sale securities 80,601 95,485
Fair Value, Recurring [Member] | Corporate Bonds [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available for sale securities 11,615 10,637
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
Fair Value, Recurring [Member] | Level 2 [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Available for sale securities 104,481 108,571
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 12,265  
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 80,601 95,485
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 $ 11,615 10,637
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