Annual report pursuant to Section 13 and 15(d)

Loans Receivable - Additional Information (Detail)

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Loans Receivable - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2020
USD ($)
Property
Dec. 31, 2019
USD ($)
Property
Accounts, Notes, Loans and Financing Receivable [Line Items]    
PPP loans included in commercial and industrial loans $ 4,880,168,000 $ 4,610,147,000
Accrued interest on loans 16,363,000 11,742,000
Loans pledged to secure advances 2,170,000,000 1,350,000,000
Loans 90 days or more past due and still accruing $ 0 $ 0
Number of real estate properties | Property 4 2
Other real estate owned ("OREO") $ 2,360,000 $ 63,000
Reserves relating to loans included in allowance for credit losses $ 16,000 22,700,000
Loans default payment past due period 30 days  
Total recorded investment $ 398,000 132,000
Allowance for credit losses resulting from defaulted loans 3,000 0
60-89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivable, past due less than 90 days 53,400,000 60,900,000
Pass/Pass-Watch    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
PPP loans included in commercial and industrial loans 4,663,021,000  
Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
PPP loans included in commercial and industrial loans 76,978,000  
Classified    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
PPP loans included in commercial and industrial loans 140,169,000  
Loans | Accrued Interest    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest on loans 15,200,000 $ 10,000,000.0
Unpaid deferred interest receivable related to loans modified under CARES Act 7,500,000  
Unpaid deferred interest receivable related to loans modified under CARES Act, net of valuation allowance 1,700,000  
Payment Protection Program    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
PPP loans included in commercial and industrial loans 295,700,000  
Loans Modified under provision of CARES Act 155,600,000  
Payment Protection Program | 60-89 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans previously modified under provision of CARES Act 1.7  
Payment Protection Program | 30-59 Days Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans previously modified under provision of CARES Act 4.9  
Payment Protection Program | 90 Days or More Past Due    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans previously modified under provision of CARES Act 13.9  
Payment Protection Program | Pass/Pass-Watch    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Modified under provision of CARES Act 99,900,000  
Payment Protection Program | Special Mention    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Modified under provision of CARES Act 31,300,000  
Payment Protection Program | Classified    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Modified under provision of CARES Act 24,400,000  
Payment Protection Program | Payment Deferral    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans deferred under provision of CARES Act $ 1,410,000,000