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Revenue from Contracts with Customers - Summary of Total Non-interest Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers $ 705 $ 540 $ 1,568 $ 1,091
Non-interest income within scope of other ASC topics 15,820 4,843 19,954 8,191
Total other income 16,525 5,383 21,522 9,282
Service Fees on Deposit Accounts [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers 183 153 454 288
Bank Card Revenue [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers 310 156 599 292
Payroll Processing Income [Member]        
Disaggregation Of Revenue [Line Items]        
Revenue from contracts with customers $ 212 $ 231 $ 515 $ 511