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ACQUISITIONS AND FDIC INDEMNIFICATION ASSET: (Details Textual) (USD $) | 12 Months Ended |  |  | 1 Months Ended | 12 Months Ended | 42 Months Ended |  |  |  |  |  | 3 Months Ended |  |  |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Jun. 30, 2012 | Jul. 02, 2009 | Jul. 31, 2009 First National Bank Of Danville [Member] | Dec. 31, 2012 First National Bank Of Danville [Member] | Dec. 31, 2009 First National Bank Of Danville [Member] | Dec. 31, 2012 First National Bank Of Danville [Member] | Jul. 02, 2009 First National Bank Of Danville [Member] | Dec. 31, 2012 First National Bank Of Danville [Member] ASC 310-30 Loans [Member] | Dec. 31, 2011 First National Bank Of Danville [Member] ASC 310-30 Loans [Member] | Jul. 02, 2009 First National Bank Of Danville [Member] ASC 310-30 Loans [Member] | Jul. 02, 2009 First National Bank Of Danville [Member] Non ASC 310-30 Loans [Member] | Dec. 30, 2011 PNB | Jun. 30, 2012 Freestar Bank, National Association | Dec. 31, 2011 Freestar Bank, National Association | Dec. 30, 2011 Freestar Bank, National Association | Jun. 30, 2012 Freestar Bank, National Association PCI loans
Cash paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 47,000,000 |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  | 146,300,000 |  |  |  |  | 8,200,000 |  |  |  |
Cash and cash equivalents |  |  |  |  |  |  |  |  |  |  | 31,000,000 |  |  |  |  |  |  |  | 62,000,000 |
Customer related core deposit intangible asset |  |  |  |  |  |  |  |  |  |  | 4,600,000 |  |  |  |  |  |  |  | 2,100,000 |
Goodwill recorded, which is expected to be tax deductable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,800,000 | 30,500,000 |
Goodwill, Purchase Accounting Adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 715,000 |  |  |
Estimated fair value of the loans |  |  |  |  | 22,000,000 | 60,700,000 |  |  |  |  |  |  |  | 16,700,000 | 60,700,000 |  |  |  |  | 48,100,000
Contractually required payments receivable |  |  |  |  | 29,000,000 | 58,400,000 |  |  |  |  |  |  |  | 31,600,000 | 58,400,000 |  |  |  |  | 55,600,000
Fair value of assets |  |  |  |  |  | 151,800,000 |  |  |  |  | 151,800,000 |  |  |  |  |  |  |  |  |
Cash received (disbursed) from purchase of business unit | 0 | 14,849,000 | (609,000) |  |  |  | 14,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on acquisition |  |  |  | 5,100,000 |  |  |  |  | 5,100,000 |  |  |  |  |  |  |  |  |  |  |
Reimbursements from the FDIC | (2,174,000) | (1,439,000) |  |  |  |  |  |  |  | 18,000,000 |  |  |  |  |  |  |  |  |  |
Outstanding balance for reimbursement of losses | 2,632,000 | 2,384,000 | 3,977,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net changes in losses and expenses added | 2,422,000 | (192,000) |  |  |  |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Cash flows expected to be collected |  |  |  |  |  | 18,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses |  |  |  |  |  |  |  |  |  |  |  | 236,000 | 1,000,000 | 18,400,000 |  |  |  |  |  |
Fair value of assets and liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 414,000,000 |
Loans |  |  |  |  |  |  |  |  |  |  | 77,500,000 |  |  |  |  |  |  |  | 245,300,000 |
Investment securities |  |  |  |  |  |  |  |  |  |  | 24,200,000 |  |  |  |  |  |  |  | 95,500,000 |
Deposits payable |  |  |  |  |  |  |  |  |  |  | 145,700,000 |  |  |  |  |  |  |  | 361,200,000 |
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% |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |
Tax Rate To Adjust Tax Provision Expense |  | 27.91% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were 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=7514592&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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 03-3 -Paragraph 16 -Subparagraph a(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The total undiscounted amount of all uncollected contractual principal and contractual interest payments both past due and scheduled for the future, adjusted for the timing of prepayments, if considered, less any reduction by the investor at the acquisition date. This relates to consumer loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were 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=7514592&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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 03-3 -Paragraph 16 -Subparagraph a(3) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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=7514592&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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 03-3 -Paragraph 16 -Subparagraph b(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of the excess of the fair value of acquired net assets over the cost of an acquired business after pro rata reduction of the amounts that otherwise would have been assigned to acquired assets except financial assets other than investments accounted for by the equity method, assets to be disposed of by sale, deferred tax assets, prepaid assets relating to pension and postretirement benefit plans, and other current assets. This amount is considered an extraordinary item and often referred to as negative goodwill. This element is gross of the related tax effect. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 44, 45, 46 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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