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Loans - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2013 Loans | Sep. 30, 2012 Loans | Sep. 30, 2013 Loans | Sep. 30, 2012 | Dec. 31, 2012 Loans | Sep. 30, 2013 Commercial Mortgage Loan One [Member] | Mar. 31, 2013 Commercial Mortgage Loan One [Member] | Sep. 30, 2012 Commercial Mortgage Loan One [Member] | Sep. 30, 2013 Commercial Mortgage Loan One [Member] | Sep. 30, 2012 Commercial Mortgage Loan One [Member] | Dec. 31, 2012 Commercial Mortgage Loan One [Member] | Sep. 30, 2013 Commercial Mortgage Loan Two [Member] | Jun. 30, 2013 Commercial Mortgage Loan Two [Member] | Sep. 30, 2013 Commercial Mortgage Loan Two [Member] | Sep. 30, 2013 Commercial Mortgage Loan Three [Member] | Sep. 30, 2013 Minimum [Member] | Sep. 30, 2013 Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unamortized loan costs and fees | $ 322,000 |  | $ 322,000 |  | $ 232,000 |  |  |  |  |  |  |  |  |  |  |  |
Percentage of comprised loan, commercial, industrial and agricultural loans | 26.00% |  | 26.00% |  | 28.00% |  |  |  |  |  |  |  |  |  |  |  |
Percentage of comprised loan, commercial mortgage loans | 30.00% |  | 30.00% |  | 28.00% |  |  |  |  |  |  |  |  |  |  |  |
Risk rating to commercial loans | 250,000 |  | 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of loan-to-value to business equipment |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of loan-to-value to accounts receivable |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of loan-to-value to business inventory |  |  | 60.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of loan-to-value to real estate |  |  | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of residential real estate loan in portfolio | 40.00% |  | 40.00% |  | 37.00% |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of consumer loan and credit card in portfolio | 10.00% |  | 10.00% |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
Number of loans modified as troubled debt restructuring | 1 | 0 | 12 |  | 10 |  |  |  |  |  |  |  |  |  |  |  |
Additional provision for loan losses | 562,000 | 0 | 562,000 | 0 |  | 127,000 |  | 503,000 | 262,000 | 503,000 |  | 0 |  | 588,000 | 562,000 |  |
Reduction in stated interest rate modification having loan range period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years | 15 years
Extension of maturity date modification having loan range period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years | 18 years
Principal balances forgiven in connection with loan restructuring | 0 |  | 0 |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Troubled debt restructuring charged off |  |  |  |  |  |  | 595,000 |  |  |  |  |  |  |  |  |  |
Commercial mortgage loan balance amount |  |  |  |  |  |  |  |  |  |  | 1,660,000 |  | 1,086,000 |  |  |  |
Minimum period to be considered for loan to have defaulted |  |  | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired commercial mortgage loan placed on non-accrual status, modified as TDRs | $ 13,255,000 |  | $ 13,255,000 |  | $ 11,621,000 |  |  |  |  |  |  |  |  |  | $ 3,269,000 |  |
Outstanding balance of semi annual loans |  |  | Greater than $1 million |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding balance of annual loans |  |  | Less than $1 million |  |  |  |  |  |  |  |  |  |  |  |  |  |

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