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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Cash and due from banks $ 404,355 $ 131,555
Cash Reserves Required by Banking Regulations    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Cash and due from banks $ 114,300 $ 77,000
Minimum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated costs 5.00%  
Maximum    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated costs 10.00%