Quarterly report pursuant to Section 13 or 15(d)

Loans - Additional Information (Detail)

v3.21.2
Loans - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 01, 2021
Jun. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Mar. 31, 2021
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Accrued interest on loans   $ 14,397,000 $ 14,397,000   $ 16,363,000    
PPP loans included in commercial and industrial loans   4,820,092,000 4,820,092,000   4,880,168,000    
Loans pledged to secure advances   2,230,000,000 2,230,000,000   2,170,000,000    
Loans held for sale, at the lower of cost or fair value   36,030,000 36,030,000 $ 17,942,000 8,568,000 $ 32,674,000 $ 6,020,000
Gains on sale of second draw PPP loans     7,633,000 1,154,000      
Proceeds from sale of second draw PPP loans   35,760,000 53,833,000 $ 18,212,000      
Loans 90 days or more past due and still accruing   12,446,000 12,446,000   0    
TDR loans receivable   14,700,000 $ 14,700,000   25,000,000.0    
Principal and interest due     3 months        
Loans default payment past due period     30 days        
Total recorded investment   0 $ 0   398,000    
60-89 Days Past Due              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing receivable, past due less than 90 days   36.0 36.0   53,400,000    
Loans Modified under provision of CARES Act, current   0 0        
30-59 Days Past Due              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans Modified under provision of CARES Act, current   260,000 260,000        
90 Days or More Past Due              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans Modified under provision of CARES Act, current   28,000 28,000        
Subsequent Event [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Payments collected including accrued interest $ 4,600            
Partial paydown of loan $ 5,400            
Pass/Pass-Watch              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
PPP loans included in commercial and industrial loans   4,588,142,000 4,588,142,000   4,663,021,000    
Special Mention              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
PPP loans included in commercial and industrial loans   121,829,000 121,829,000   76,978,000    
Classified              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
PPP loans included in commercial and industrial loans   110,121,000 110,121,000   140,169,000    
Payment Protection Program              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans Modified under provision of CARES Act     72,300,000   155,600,000    
Loans Modified under provision of CARES Act, current   72,300,000 72,300,000   155.6    
Payment Protection Program | 60-89 Days Past Due              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans previously modified under provision of CARES Act     388,000   1,700,000    
Payment Protection Program | 30-59 Days Past Due              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans previously modified under provision of CARES Act     887,000   4,900,000    
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     1,800,000   13,900,000    
Payment Protection Program | Pass/Pass-Watch              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans Modified under provision of CARES Act     22,900,000   99,900,000    
Payment Protection Program | Special Mention              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans Modified under provision of CARES Act     36,700,000   31,300,000    
Payment Protection Program | Classified              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans Modified under provision of CARES Act     12,700,000   24,400,000    
SBA Loans              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans held for sale, at the lower of cost or fair value   22,000,000.0 22,000,000.0   8,600,000    
PPP Loans              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans held for sale, at the lower of cost or fair value   14,100,000 14,100,000   0    
Gains on sale of second draw PPP loans   203,000 2,700,000        
Proceeds from sale of second draw PPP loans   9,500,000 118,100,000        
Accrued Interest | Payment Protection Program              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
PPP loans included in commercial and industrial loans   144,100,000 144,100,000   295,700,000    
Modified Loans | Payment Protection Program              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loans Modified under provision of CARES Act     72,300,000   155,600,000    
Loans | Accrued Interest              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Accrued interest on loans   12,900,000 12,900,000   15,200,000    
Unpaid deferred interest receivable related to loans modified under CARES Act   4,100,000 4,100,000   7,500,000    
Unpaid deferred interest receivable related to loans modified under CARES Act, net of valuation allowance   $ 680,000 $ 680,000   $ 1,700,000