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Borrowed Funds - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Debt Instrument [Line Items]      
Weighted average interest rate for short-term borrowings 0.53%   1.68%
Advances of long-term borrowings $ 725,242 $ 0  
Federal Home Loan Bank Advances      
Debt Instrument [Line Items]      
Advances of long-term borrowings $ 723,000    
Weighted average interest rate 1.89%    
Weighted average interest rate for long-term borrowings 2.13%   2.23%
Federal Home Loan Bank Advances | Minimum      
Debt Instrument [Line Items]      
Term of debt 3 years    
Federal Home Loan Bank Advances | Maximum      
Debt Instrument [Line Items]      
Term of debt 5 years    
Federal Home Loan Bank Advances      
Debt Instrument [Line Items]      
Amount of hedged debt $ 600,000