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Fair Value - Additional Information (Detail)
12 Months Ended
Dec. 31, 2020
USD ($)
Servicing Assets At Fair Value [Line Items]  
Servicing rights of sold loans $ 846,500,000
Weighted average net servicing fee income, Basis points 0.273%
Weighted average prepayment speed assumption used in the fair value 15.81%
Weighted average discount rate 10.18%
Paycheck Protection Program [Member]  
Servicing Assets At Fair Value [Line Items]  
Credit risk $ 0
Minimum [Member]  
Servicing Assets At Fair Value [Line Items]  
Estimated base annual servicing costs $ 75.00
Base discount rate 10.00%
Maximum [Member]  
Servicing Assets At Fair Value [Line Items]  
Estimated base annual servicing costs $ 90.00
Base discount rate 13.00%
MSR Assets [Member]  
Servicing Assets At Fair Value [Line Items]  
Amortized cost of assets $ 7,084,000
Fair value of assets $ 7,300,000