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Loans - Additional Information (Detail) (USD $) | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended |  | 6 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended
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Jun. 30, 2014 Loans | Dec. 31, 2013 Loans | Jun. 30, 2014 Trouble Debt Restructuring [Member] Loans | Jun. 30, 2013 Trouble Debt Restructuring [Member] Loans | Jun. 30, 2014 Trouble Debt Restructuring [Member] Loans | Jun. 30, 2014 Maximum [Member] | Dec. 31, 2013 Maximum [Member] | Jun. 30, 2014 Minimum [Member] | Jun. 30, 2013 Commercial Mortgage Loan One [Member] | Mar. 31, 2013 Commercial Mortgage Loan One [Member] | Jun. 30, 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] | Jun. 30, 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 | $ 830,000 | $ 911,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of comprised loan, commercial, industrial and agricultural loans | 33.00% | 33.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of comprised loan, commercial mortgage loans | 27.00% | 27.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 37.00% | 36.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum percentage of consumer loan and credit card in portfolio |  |  |  |  |  | 10.00% | 10.00% |  |  |  |  |  |  |  |  |  |
Loan portfolio segment reclassification |  |  |  |  |  |  |  |  |  |  |  |  |  | 66,000,000 | 70,000,000 | 54,000,000 | 12,000,000
Number of Loans | 12 | 12 | 0 | 0 | 1 |  |  |  |  |  |  |  |  |  |  |  |
Reduction in stated interest rate modification having loan range period |  |  |  |  |  | 15 years |  | 4 years |  |  |  |  |  |  |  |  |
Extension of maturity date modification having loan range period |  |  |  |  |  | 18 years |  | 4 years |  |  |  |  |  |  |  |  |
Minimum period to be considered for loan to have defaulted | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal balances forgiven in connection with loan restructurings | 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 |  |  |  |  |  |  |  |  | $ 0 |  | $ 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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- Definition Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533 + Details
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