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Borrowed Funds - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
May 28, 2021
May 25, 2021
Apr. 01, 2021
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Debt Instrument [Line Items]                  
Weighted average interest rate for short-term borrowings       0.35% 0.35%   0.35%   0.38%
Payments of FHLBank borrowings       $ 248,000,000          
Loss on extinguishment of debt         $ 8,406,000 $ 0 $ 8,406,000 $ 0  
FHLB advances, callable for early redemption       0 0   0    
Subordinated borrowing interest rate 3.00% 3.00%              
Subordinated debt carrying value       296,000,000.0 296,000,000.0   296,000,000.0    
Subordinated Notes Due April 2026                  
Debt Instrument [Line Items]                  
Subordinated debt, net     $ 60,000,000            
Subordinated borrowing interest rate     6.25%            
Subordinated Notes Due September 2023                  
Debt Instrument [Line Items]                  
Subordinated debt, net       125,000,000 125,000,000   $ 125,000,000    
Subordinated borrowing interest rate             5.125%    
Subordinated Notes Due June 2025                  
Debt Instrument [Line Items]                  
Subordinated debt, net       100,000,000 100,000,000   $ 100,000,000    
Subordinated borrowing interest rate             4.55%    
Subordinated Notes Due June 2030                  
Debt Instrument [Line Items]                  
Subordinated debt, net       $ 115,000,000 $ 115,000,000   $ 115,000,000    
Subordinated borrowing interest rate             5.25%    
Federal Home Loan Bank Advances                  
Debt Instrument [Line Items]                  
Weighted average interest rate for long-term borrowings       1.91% 1.91%   1.91%   2.02%
Effective interest rate of debt       1.82% 1.82%   1.82%    
Loss on extinguishment of debt         $ 8,400,000   $ 8,400,000    
Subordinated Debt                  
Debt Instrument [Line Items]                  
Subordinated debt, net   $ 300,000,000              
Subordinated debt initial term   5 years              
Subordinated debt SOFR term   3 months              
Subordinated Debt | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate                  
Debt Instrument [Line Items]                  
Subordinated debt basis points   2.36%              
Long-Term Borrowings                  
Debt Instrument [Line Items]                  
Weighted average interest rate for long-term borrowings       3.41% 3.41%   3.41%   3.37%
Federal Home Loan Bank Advances                  
Debt Instrument [Line Items]                  
Amount of hedged debt       $ 700,000,000 $ 700,000,000   $ 700,000,000