Quarterly report pursuant to Section 13 or 15(d)

Loans - Additional Information (Detail)

v3.20.2
Loans - Additional Information (Detail) - USD ($)
 6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest on loans $ 21,372,000 $ 11,742,000
Loans pledged to secure advances 2,400,000,000 1,400,000,000
PPP loans included in commercial and industrial loans 4,825,642,000 4,610,147,000
Loans 90 days or more past due and still accruing 0 0
TDR loans receivable $ 31,600,000 56,300,000
Principal and interest due 3 months  
Reserves relating to loans included in allowance for credit losses $ 100,000 22,700,000
Loans default payment past due period 30 days  
Total recorded investment $ 33,000 132,000
Payment Protection Program    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Modified Under CARES Act 1,400,000,000  
Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
PPP loans included in commercial and industrial loans 730,399,000 484,093,000
Commercial and Industrial | Payment Protection Program    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
PPP loans included in commercial and industrial loans 301,800,000  
Loans | Accrued Interest    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest on loans $ 20,300,000 $ 10,000,000.0