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Fair Value - Undesignated Derivative Instruments (Detail) - Mortgage Banking - Level 2 - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Rate lock commitments    
Derivatives, Fair Value [Line Items]    
Gross assets $ 15,949 $ 10,844
Gross liabilities 1,790 87
Net commitments (14,159) (10,757)
Forward sales contracts    
Derivatives, Fair Value [Line Items]    
Gross assets 708 1
Gross liabilities 926 5,217
Net commitments $ (218) $ (5,216)