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Loans Receivable and Allowance for Loan Losses - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
SecurityLoan
Contract
borrower
Dec. 31, 2016
USD ($)
SecurityLoan
Contract
borrower
Dec. 31, 2015
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Amortization of interest income $ 1,000 $ 1,300 $ 1,100
Principal amount of nonaccrual loans $ 34,900 $ 42,400  
Number of loans 90 days past due and still accruing | Contract 0 0  
Increase in interest income $ 1,900 $ 2,200 1,200
Amount of cash basis interest income recognized on impaired loans 1,756 $ 1,486 1,900
Impaired loan defined floor limit (greater than) $ 1,000    
Impaired loans number | SecurityLoan 149 141  
Impaired loans $ 52,041 $ 52,019  
Number of troubled debt restructurings | SecurityLoan   136  
Number of borrowers | borrower 121 110  
Loans and leases receivable, impaired, nonperforming, accrual of interest   $ 41,600  
Charge-offs $ 8,941 6,950 $ 8,828
Allowances for loan losses $ 2,690 $ 2,334  
Weighted average modified interest rate 4.18% 5.25%  
Yield percentage rate 4.19% 4.25%  
Loans modified as TDRs | SecurityLoan 0    
Loans declined $ 303    
Average balances of impaired loans 54,000 $ 52,000  
Loan commitments 1,710,000 1,551,200  
Undisbursed home equity and personal credit lines $ 270,900 $ 279,800  
Impaired Loans Troubled Debt Restructurings [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans number | SecurityLoan 141    
Impaired loans $ 41,700    
Number of troubled debt restructurings | SecurityLoan 125 114  
Loans and leases receivable, impaired, nonperforming, accrual of interest $ 31,700 $ 29,900  
Charge-offs 5,100 0  
Allowances for loan losses 166 187  
No Allowance For Loan Losses Required [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired financing receivable with no related allowance $ 31,400 $ 31,800  
Residential Commercial And Commercial Mortgage Loan [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans number | SecurityLoan 149 141  
Impaired loans $ 52,000 $ 52,000  
Residential Commercial And Commercial Mortgage Loan [Member] | Non Accrual [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Impaired loans number | SecurityLoan 24 27  
Impaired loans $ 20,300 $ 22,100  
Team Capital [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Certain loans acquired in transfer not accounted for as debt securities $ 1,000 $ 1,300