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Loans Receivable and Allowance for Credit Losses (Narrative) (Detail)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
counterparty
SecurityLoan
Mar. 31, 2020
USD ($)
SecurityLoan
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
SecurityLoan
troubled_debt_restructuring
counterparty
borrower
Sep. 30, 2019
USD ($)
SecurityLoan
Dec. 31, 2019
USD ($)
borrower
troubled_debt_restructuring
SecurityLoan
Jun. 30, 2020
USD ($)
Jan. 01, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Less allowance for credit losses $ 106,314,000   $ 57,344,000 $ 106,314,000 $ 57,344,000 $ 55,525,000 $ 86,259,000 $ 55,525,000 $ 62,810,000 $ 55,562,000
Retained earnings 694,240,000     694,240,000   695,273,000        
Principal amount of nonaccrual loans 49,000,000.0     49,000,000.0   40,200,000        
Loans less than 90 days past due $ 4,900,000     $ 4,900,000   $ 13,100,000        
Number of loans 90 days past due and still accruing | SecurityLoan 0     0   0        
Impaired loan defined floor limit (greater than) $ 1,000,000.0     $ 1,000,000.0            
Impaired loans number | SecurityLoan   158   151            
Impaired loans 65,809,000     $ 65,809,000   $ 70,641,000        
Number of troubled debt restructurings | troubled_debt_restructuring       122   147        
Number of borrowers | borrower       119   128        
Loans and leases receivable, impaired, nonperforming, accrual of interest 38,000,000.0     $ 38,000,000.0   $ 42,700,000        
Collateral-dependent impaired loans 18,000,000.0     18,000,000.0   20,400,000        
Provision for credit losses 6,400,000   500,000 32,017,000 10,200,000          
Charge off, impaired loan $ 612,000   $ 5,700,000 $ 3,800,000 $ 7,700,000          
Weighted average modified interest rate 4.82%     5.46%            
Weighted average prior modification rate 4.83%     5.51%            
Number of payment defaults for loans modified as TDRs | SecurityLoan       0 1          
Purchased credit-impaired loans           746,000        
Allowances for loan losses $ 3,300,000     $ 3,300,000   5,067,000        
Impaired financing receivable with no related allowance $ 37,700,000     37,700,000   16,000,000.0        
Average balance of impaired loans   $ 74,100,000   $ 70,565,000   74,137,000        
Number of PPP loans | counterparty 1,289     1,289            
Paycheck protection program $ 474,800,000     $ 474,800,000            
Consumer Loan                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Collateral-dependent impaired loans 9,000     9,000            
Commercial Loan                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Collateral-dependent impaired loans 13,200,000     13,200,000            
Residential Real Estate                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Collateral-dependent impaired loans 4,700,000     4,700,000            
Impaired Loans Troubled Debt Restructurings                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Impaired loans number | SecurityLoan   133                
Loans and leases receivable, impaired, nonperforming, accrual of interest           $ 48,300,000        
Allowances for loan losses $ 0     $ 421,000            
Accounting Standards Update 2016-13                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Less allowance for credit losses               7,900,000    
Accounting Standards Update 2016-13, Effect On Loans Receivable                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Retained earnings               $ 5,900,000