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Loans and Leases Receivable and Allowance for Credit Losses - Additional Information (Detail)
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Commitment
Jan. 01, 2020
USD ($)
Sep. 30, 2020
USD ($)
Commitment
Sep. 30, 2020
USD ($)
Loan
Commitment
Sep. 30, 2019
USD ($)
Loan
Jun. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Loan
Commitment
Sep. 30, 2019
USD ($)
Loan
Dec. 31, 2019
USD ($)
Commitment
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]                      
Accrued interest receivable $ 65,668,000   $ 65,668,000 $ 65,668,000     $ 65,668,000   $ 38,072,000    
Loans receivable 16,423,029,000   16,423,029,000 16,423,029,000     16,423,029,000   9,508,367,000    
Interest income       132,107,000 $ 118,444,000   $ 366,634,000 $ 315,126,000      
Loans held for sale, average life from purchase to sale             30 days        
Accrued interest reversed             $ 1,200,000        
Allowance for credit losses on loans and leases 155,561,000 $ 136,200,000 155,561,000 155,561,000 $ 51,053,000 $ 159,905,000 155,561,000 $ 51,053,000 56,379,000 $ 48,388,000 $ 39,972,000
Allowance for credit loss, period increase             19,400,000        
Loans reported as TDR 16,100,000   16,100,000 16,100,000     $ 16,100,000   13,300,000    
Minimum performance requirement             9 months        
Lease receivable, TDR $ 0   $ 0 $ 0     $ 0   $ 0    
Number of loans | Loan       67 7   105 21      
Number of commitments to lend additional funds (commitment) | Commitment 0   0 0     0   0    
Purchased-credit-impaired loans $ 14,400,000         17,488,000          
Financing receivable sale       $ 21,568,000 $ 0   $ 23,390,000 $ 0      
Loans pledged as collateral 8,900,000,000   $ 8,900,000,000 8,900,000,000     8,900,000,000   $ 4,600,000,000    
Small Business Administration (SBA), CARES Act, Paycheck Protection Program                      
Financing Receivable, Troubled Debt Restructuring [Line Items]                      
Loans receivable 5,000,000,000.0   5,000,000,000.0 5,000,000,000.0     5,000,000,000.0        
Interest income       24,300,000     36,000,000.0        
Accounting Standards Update 2016-13                      
Financing Receivable, Troubled Debt Restructuring [Line Items]                      
Initial allowance on loans purchased with credit deterioration   200,000                  
Financing receivable, purchased with credit deterioration, discount   $ 300,000                  
Residential real estate                      
Financing Receivable, Troubled Debt Restructuring [Line Items]                      
Residential real estate held in other real estate owned 100,000   100,000 100,000     100,000   200,000    
Loans in process of foreclosure 500,000   500,000 500,000     500,000   900,000    
Commercial and industrial                      
Financing Receivable, Troubled Debt Restructuring [Line Items]                      
Financing receivable sale       3,968,000 0   3,968,000 0      
Commercial real estate non-owner occupied                      
Financing Receivable, Troubled Debt Restructuring [Line Items]                      
Amount deferred, CARES Act 79,000,000.0   79,000,000.0 79,000,000.0     79,000,000.0        
Financing receivable sale     17,600,000                
Multi-family                      
Financing Receivable, Troubled Debt Restructuring [Line Items]                      
Allowance for credit losses on loans and leases 15,026,000   15,026,000 15,026,000 $ 7,498,000 14,697,000 15,026,000 $ 7,498,000 6,157,000 $ 9,926,000 $ 11,462,000
Purchased-credit-impaired loans           $ 1,688,000          
Consumer loans                      
Financing Receivable, Troubled Debt Restructuring [Line Items]                      
Amount deferred, CARES Act 25,000,000.0   25,000,000.0 $ 25,000,000.0     $ 25,000,000.0        
Forgiveness of debt                      
Financing Receivable, Troubled Debt Restructuring [Line Items]                      
Number of loans | Loan       0 0   0 0      
Other Assets                      
Financing Receivable, Troubled Debt Restructuring [Line Items]                      
Accrued interest receivable 61,900,000   61,900,000 $ 61,900,000     $ 61,900,000   $ 34,800,000    
Commercial Real Estate | Commercial and industrial | Collateral Dependent Loan                      
Financing Receivable, Troubled Debt Restructuring [Line Items]                      
Loans receivable 32,100,000   32,100,000 32,100,000     32,100,000        
Government-Guaranteed Collateral                      
Financing Receivable, Troubled Debt Restructuring [Line Items]                      
Loans pledged as collateral $ 4,800,000,000   $ 4,800,000,000 $ 4,800,000,000     $ 4,800,000,000