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Loans Receivable and Allowance for Loan Losses (Narrative) (Detail)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Contract
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
SecurityLoan
borrower
troubled_debt_restructuring
Contract
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
SecurityLoan
Contract
Dec. 31, 2016
USD ($)
SecurityLoan
borrower
troubled_debt_restructuring
Contract
May 30, 2014
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Principal amount of nonaccrual loans $ 36,400,000   $ 36,400,000   $ 36,400,000 $ 42,400,000  
Loans less than 90 days past due $ 9,100,000   $ 9,100,000   $ 9,100,000 $ 7,300,000  
Number of loans 90 days past due and still accruing | Contract 0   0   0 0  
Impaired loan defined floor limit (greater than) $ 1,000,000.0   $ 1,000,000.0   $ 1,000,000.0    
Impaired loans number | SecurityLoan     145     141  
Impaired loans 50,181,000   $ 50,181,000   50,181,000 $ 52,019,000  
Number of troubled debt restructurings | troubled_debt_restructuring     126     114  
Number of borrowers | borrower     122     110  
Loans and leases receivable, impaired, nonperforming, accrual of interest 31,700,000   $ 31,700,000   $ 31,700,000 $ 29,900,000  
Charge off, impaired loan $ 3,200,000 $ 0 $ 4,400,000 $ 0      
Weighted average modified interest rate 4.36%   4.02%        
Weighted average prior modification rate 4.33%   3.93%        
Number of payment defaults for loans modified as TDRs | SecurityLoan         0    
Allowances for loan losses $ 2,872,000   $ 2,872,000   $ 2,872,000 2,334,000  
Impaired financing receivable with no related allowance 29,700,000   29,700,000   29,700,000 31,800,000  
Average balance of impaired loans     51,198,000     52,002,000  
Team Capital Bank [Member]              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Fair value of acquired loans             $ 5,200,000
Balance of PCI loans 1,000,000   1,000,000   $ 1,000,000 $ 1,300,000  
Impaired Loans Troubled Debt Restructurings [Member]              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Allowances for loan losses $ 0   $ 120,000