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Leases - Additional Information (Detail)
$ in Thousands
Jun. 30, 2019
USD ($)
Operating Leased Assets [Line Items]  
Lease liability $ 27,454
Lease assets $ 25,575
Operating Lease Weighted Average Remaining Lease Term 5 years 4 months 24 days
Operating Lease Weighted Average Discount Rate Percent 5.54%
Corporate Headquarters [Member]  
Operating Leased Assets [Line Items]  
Lease agreement term 11 years
Extend lease agreement term 10 years
Minimum [Member] | Branch [Member]  
Operating Leased Assets [Line Items]  
Lease agreement term 5 years
Extend lease agreement term 3 years
Maximum [Member] | Branch [Member]  
Operating Leased Assets [Line Items]  
Lease agreement term 7 years
Extend lease agreement term 5 years