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Acquisitions and FDIC Indemnification Asset (Details Textual) (USD $) | 0 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  | 9 Months Ended | 12 Months Ended |  | 9 Months Ended |
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Jul. 02, 2009 | Sep. 30, 2013 | Sep. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 | Dec. 31, 2011 | Sep. 30, 2013 Commercial And Single Family Residential Mortgage Loans [Member] Minimum [Member] | Sep. 30, 2013 Commercial And Single Family Residential Mortgage Loans [Member] Maximum [Member] | Sep. 30, 2013 First National Bank Of Danville [Member] | Dec. 31, 2009 First National Bank Of Danville [Member] | Jul. 02, 2009 First National Bank Of Danville [Member] | Jul. 02, 2009 First National Bank Of Danville [Member] ASC 310-30 Loans [Member] | Sep. 30, 2013 After Acquisition [Member] Commercial And Single Family Residential Mortgage Loans [Member] Minimum [Member] | Sep. 30, 2013 After Acquisition [Member] Commercial And Single Family Residential Mortgage Loans [Member] Maximum [Member] | Aug. 16, 2013 Bank Of Amercia [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired |  |  |  |  |  |  |  |  |  |  | $ 151,800,000 |  |  |  |
Loans |  |  |  |  |  |  |  |  |  |  | 77,500,000 |  |  |  | 1,900,000
Investment securities |  |  |  |  |  |  |  |  |  |  | 24,200,000 |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  | 31,000,000 |  |  |  | 177,700,000
Liabilities |  |  |  |  |  |  |  |  |  |  | 146,300,000 |  |  |  |
Deposits |  |  |  |  |  |  |  |  |  |  | 145,700,000 |  |  |  | 189,300,000
Customer related core deposit intangible asset |  |  |  |  |  |  |  |  |  |  | 4,600,000 |  |  |  | 2,200,000
Cash received (disbursed) from purchase of business unit | 14,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on acquisition |  |  |  |  |  |  |  |  |  | 5,100,000 |  |  |  |  |
Losses on assets, threshold under loss-sharing agreement |  |  |  |  |  |  |  |  |  | 29,000,000 |  |  |  |  |
Percentage of losses to be reimbursed by the FDIC, on losses up to the threshold amount |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |
Percentage of losses to be reimbursed by the FDIC, on losses exceeding the threshold amount |  |  |  |  |  |  |  |  |  | 95.00% |  |  |  |  |
Loss Sharing Provisions Period |  |  |  |  |  |  | 5 years | 10 years |  |  |  |  | 8 years | 10 years |
Reimbursements from the FDIC |  | 143,000 | 281,000 | 2,174,000 |  |  |  |  | 18,300,000 |  |  |  |  |  |
Outstanding balance for reimbursement of losses |  | 1,171,000 | 1,171,000 | 2,632,000 | 1,515,000 | 2,384,000 |  |  | 1,200,000 |  |  |  |  |  |
Net changes in losses and expenses added |  |  |  |  |  |  |  |  | 493,000 |  |  |  |  |  |
Percentage of loans, acquired and subject to the loss-sharing agreement with the FDIC, which were included in the estimate of future potential losses |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |
Contractually required payments receivable | 58,400,000 |  |  |  |  |  |  |  |  |  |  | 31,600,000 |  |  |
Allowance for credit losses |  | 623,000 | 623,000 |  |  |  |  |  |  |  |  | 18,400,000 |  |  |
Estimated fair value of the loans | 60,700,000 |  |  |  |  |  |  |  |  |  |  | 16,700,000 |  |  |
Fixed Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,900,000
Other liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 300,000
Goodwill |  | 39,489,000 | 39,489,000 | 37,612,000 |  |  |  |  |  |  |  |  |  |  | 1,900,000
Goodwill expected tax deductible amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,600,000

X
- Definition Represents the percentage of losses on assets acquired under business combination and covered under loss-sharing agreement, to be reimbursed by FDIC, if losses exceed the threshold amount. + References No definition available. + Details
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- Definition Represents the percentage of losses on assets acquired under business combination and covered under loss-sharing agreement, to be reimbursed by FDIC, if losses are up to the threshold amount. + References No definition available. + Details
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- Definition Represents the threshold amount of losses on assets acquired in a business combination to calculate the amount of reimbursement under the loss-sharing agreement. + References No definition available. + Details
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- Definition The element representing loss sharing provisions during the period. + References No definition available. + Details
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- Definition Represents the percentage of loans, acquired and subject to the loss-sharing agreement with the FDIC, which were included in the estimate of future potential losses. + References No definition available. + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 + Details
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- Definition In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6571-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6527-128477 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6396-128476 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6387-128476 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6393-128476 + Details
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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of intangible assets, excluding goodwill, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition Amount of liabilities assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 + Details
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- Definition The amount of property, plant, and equipment recognized as of the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6910749&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=25498275&loc=d3e2207-128464 + Details
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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition Fair value at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Amount of contractually required payments receivable at acquisition of acquired consumer loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition Carrying amount of receivable assets originating from the indemnification agreement with the Federal Deposit Insurance Corporation (FDIC), in which the FDIC is to partially cover losses. + References No definition available. + Details
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- Definition Amount of increases to the indemnification asset due to additional estimated losses assumed by the Federal Deposit Insurance Corporation (FDIC), relating to loss sharing agreements with the FDIC. + References No definition available. + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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