Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Additional Information (Detail)

v3.19.3
Fair Value Measurements - Additional Information (Detail)
Jun. 30, 2019
USD ($)
SecurityLoan
Dec. 31, 2018
USD ($)
Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unpaid principal balance of Non-accrual Non-PCI loans reviewed individually for amount of impairment $ 250,000  
Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Unpaid principal balance of Non-accrual Non-PCI loans reviewed collectively for amount of impairment $ 250,000  
Impaired loans | Real estate loans | Non-recurring Basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Number of impaired loans | SecurityLoan 7  
Fair value of impaired loans $ 13,600,000 $ 3,500,000
Impaired loans | Commercial and industrial loans | Non-recurring Basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Number of impaired loans | SecurityLoan 7  
Fair value of impaired loans $ 13,100,000 $ 1,700,000