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Derivative Financial Instruments - Summary of Fair Value of Derivative Financial Instruments (Detail) - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Derivative [Line Items]    
Total derivative assets $ 140,201,000 $ 51,301,000
Total derivative liabilities 18,187,000 12,393,000
Fair values of counterparty interest rate swaps 0  
Interest rate contracts net adjustment 100,400,000 31,600,000
Derivatives designated as hedging instruments    
Derivative [Line Items]    
Total derivative assets 17,202,000 7,157,000
Total derivative liabilities 1,988,000 1,046,000
Derivatives designated as hedging instruments | Interest rate contracts | Other assets    
Derivative [Line Items]    
Total derivative assets 17,202,000 7,157,000
Derivatives designated as hedging instruments | Interest rate contracts | Other liabilities    
Derivative [Line Items]    
Total derivative liabilities 1,988,000 1,046,000
Derivatives not designated as hedging instruments    
Derivative [Line Items]    
Total derivative assets 122,999,000 44,144,000
Total derivative liabilities 16,199,000 11,347,000
Derivatives not designated as hedging instruments | Interest rate contracts | Other assets    
Derivative [Line Items]    
Total derivative assets 113,300,000 42,224,000
Derivatives not designated as hedging instruments | Interest rate contracts | Other liabilities    
Derivative [Line Items]    
Total derivative liabilities 13,676,000 10,883,000
Derivatives not designated as hedging instruments | Mortgage contracts | Other assets    
Derivative [Line Items]    
Total derivative assets 9,375,000 1,702,000
Derivatives not designated as hedging instruments | Mortgage contracts | Other liabilities    
Derivative [Line Items]    
Total derivative liabilities 2,335,000 354,000
Derivatives not designated as hedging instruments | Foreign currency contracts | Other assets    
Derivative [Line Items]    
Total derivative assets 324,000 218,000
Derivatives not designated as hedging instruments | Foreign currency contracts | Other liabilities    
Derivative [Line Items]    
Total derivative liabilities $ 188,000 $ 110,000