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Fair Value Measurements - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Specific adjustments to impaired loans recognized $ 244,000 $ 242,000 $ 540,000  
Amortized cost of Level 3 securities 1,635,000 1,635,000 1,635,000  
Liabilities measured at fair value on a recurring or nonrecurring basis 0 0 $ 0 $ 0
Unrealized loss       0
Real Estate, Other [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of loans   125,000    
Impaired Loans [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fair value of loans   1,142,000    
Fair Value Measurements, Level 3 Inputs [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Amortized cost of Level 3 securities 37,227,000 37,227,000   $ 126,586,000
Unrealized loss $ 0 $ 0