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Borrowed Funds - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Aggregate repayment of long-term debt after 2025   $ 271,700,000  
Payments to acquire federal home loan bank stock   10,000,000.0  
Securities sold under agreements to repurchase   2,249,861,000 $ 1,864,635,000
Accrued interest payable   326,000 $ 220,000
FHLB [Member]      
Debt Instrument [Line Items]      
Federal home loan bank amount outstanding   0  
Letter of Credit [Member] | FHLB [Member]      
Debt Instrument [Line Items]      
Borrowing capacity   $ 1,500,000,000  
Wells Fargo Bank 1.25% due 2012 [Member]      
Debt Instrument [Line Items]      
Interest rate based on LIBOR   1.25% above LIBOR  
Borrowing capacity   $ 30,000,000.0  
Debt instrument, interest rate based on prime lending rate   1.75% below the prime  
Revolving line of credit, commitment fee for unused portion   0.40%  
Revolving line of credit outstanding amount   $ 0  
Subordinated Notes [Member]      
Debt Instrument [Line Items]      
Debt instrument, issuance date Sep. 30, 2020    
Subordinated notes, issued $ 200,000,000.0    
Debt instrument, interest rate 3.70%    
Debt instrument, maturity date Sep. 17, 2030    
Debt instrument, frequency of periodic payment   semi-annually  
Debt instrument, redemption, description   The Company may redeem the notes, in whole or in part, on September 17, 2025, or on any interest payment date thereafter.  
Debt instrument, redemption period, start date Sep. 17, 2025    
Unamortized debt issuance costs   $ 2,100,000  
Marquette Capital Trust I, Marquette Capital Trust II, Marquette Capital Trust III And Marquette Capital Trust IV [Member] | Marquette [Member]      
Debt Instrument [Line Items]      
Long-term debt   103,100,000  
Long-term debt acquired at fair value   $ 71,700,000  
Trust Preferred Securities [Member] | Marquette Capital Trust I, Marquette Capital Trust III And Marquette Capital Trust IV [Member] | Marquette [Member]      
Debt Instrument [Line Items]      
Interest rate based on LIBOR   LIBOR rate with spreads ranging from 133 basis points to 160 basis points  
Preferred securities maturity date range, start   Jan. 31, 2036  
Preferred securities maturity date range, end   Sep. 30, 2036  
Minimum [Member] | Trust Preferred Securities [Member] | Marquette Capital Trust I, Marquette Capital Trust III And Marquette Capital Trust IV [Member] | Marquette [Member]      
Debt Instrument [Line Items]      
Interest rate of trust preferred securities   1.33%  
Maximum [Member] | Trust Preferred Securities [Member] | Marquette Capital Trust I, Marquette Capital Trust III And Marquette Capital Trust IV [Member] | Marquette [Member]      
Debt Instrument [Line Items]      
Interest rate of trust preferred securities   1.60%