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Loans - Additional Information (Detail) (USD $) | 3 Months Ended |  | 3 Months Ended |  | 3 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014 Minimum [Member] | Mar. 31, 2014 Maximum [Member] | Dec. 31, 2013 Maximum [Member] | Mar. 31, 2013 Commercial Mortgage Loan One [Member] | Dec. 31, 2013 Commercial Mortgage Loan One [Member] | Dec. 31, 2012 Commercial Mortgage Loan One [Member] | Mar. 31, 2014 Commercial, Industrial, and Agricultural [Member] | Mar. 31, 2014 Commercial Mortgages [Member] | Mar. 31, 2014 Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net unamortized loan costs and fees | $ 870,000 | $ 911,000 |  |  |  |  |  |  |  |  |
Percentage of comprised loan, commercial, industrial and agricultural loans | 28.00% | 28.00% |  |  |  |  |  |  |  |  |
Percentage of comprised loan, commercial mortgage loans | 32.00% | 32.00% |  |  |  |  |  |  |  |  |
Risk rating to commercial loans | 250,000,000 |  |  |  |  |  |  |  |  |  |
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 | 36.00% | 36.00% |  |  |  |  |  |  |  |  |
Maximum percentage of consumer loan and credit card in portfolio |  |  |  | 10.00% | 10.00% |  |  |  |  |  |
Loan portfolio segment reclassification |  |  |  |  |  |  |  |  | 66,000,000 | 54,000,000 | 12,000,000
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 |  |  |  |  |  |  |
Minimum period to be considered for loan to have defaulted | 90 days |  |  |  |  |  |  |  |  |  |
Principal balances forgiven in connection with loan restructuring | 0 | 0 |  |  |  |  |  |  |  |  |
Troubled debt restructuring charged off |  |  |  |  |  | 595,000 |  |  |  |  |
Commercial mortgage loan balance amount |  |  |  |  |  |  | 1,086,000 | 1,660,000 |  |  |
Additional provision for loan losses |  |  |  |  |  | $ 135,000 | $ 615,000 |  |  |  |
Outstanding balance of semi annual loans | Greater than $1 million |  |  |  |  |  |  |  |  |  |
Outstanding balance of annual loans | Less than $1 million |  |  |  |  |  |  |  |  |  |

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