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Fair Value - Additional information (Detail)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
loan
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
loan
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Fair Value Measurements Of Financial Instruments [Line Items]                      
Change in fair value related to loans held for sale                 $ (2,003) $ 0 $ 226
Carrying amount of impaired loans with specific allocations $ 27,035       $ 5,654       27,035 5,654  
Allowance for Loan Losses Allocated 20,771       17       20,771 17  
Provision for loan losses $ 18,961 $ 1,000 $ 7,031 $ 5,055 975 $ 136 $ 570 $ 573 $ 32,047 2,254 $ 4,313
Fair Value                      
Fair Value Measurements Of Financial Instruments [Line Items]                      
Number of collateral-dependent loans | loan 10               10    
Carrying amount of impaired loans with specific allocations $ 739       150       $ 739 150  
Allowance for Loan Losses Allocated 20,771               20,771    
Provision for loan losses                   17  
Loans Held for Sale                      
Fair Value Measurements Of Financial Instruments [Line Items]                      
Unpaid principal balance of loans held for sale $ 42,152       $ 10,722       42,152 10,722  
Change in fair value related to loans held for sale                 $ 1,010 $ 381  
Maximum | Loans Held for Sale                      
Fair Value Measurements Of Financial Instruments [Line Items]                      
Term of loan                 90 days