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Acquisition (Details Textual) (USD $) | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2012 Heartland [Member] | Jul. 17, 2012 Heartland [Member] | Dec. 31, 2012 Heartland Bancshares Inc [Member]
Acquisition (Textual) [Abstract] |  |  |  |  |  |  |
Date of acquisition agreement | Jul. 17, 2012 |  |  |  |  |  |
Exchange ratio per share to Heartland shareholder |  |  |  |  |  | $ 0.81 |
Market closing price per share |  |  |  |  |  | $ 16.83 |
Transaction value is estimated |  |  |  |  |  | $ 26,900,000 |
Costs related to the acquisition |  |  |  |  | 1,500,000 |  |
Common stock outstanding | 8,617,466 | 7,421,544 |  |  |  | 1,442,449 |
Common stock issued |  |  |  |  | 1,168,383 |  |
Net tangible assets acquired |  |  |  |  |  | 26,900,000 |
Net intangible assets acquired | 2,332,000 |  |  |  |  | 2,300,000 |
Purchase price of the business assets | 2,647,000 |  |  |  |  | 10,800,000 |
Acquisition of goodwill | 13,838,000 |  |  |  |  | 13,800,000 |
Core deposit intangible amortization period |  |  |  |  | 7 years |  |
Loan portfolio acquired |  |  |  |  |  | 131,100,000 |
Discount on loan portfolio acquired |  |  |  |  |  | 16,500,000 |
Performing portion of the loan portfolio acquired |  |  |  |  |  | 95,400,000 |
Estimated fair value of performing portion of the loan portfolio |  |  |  |  |  | 91,600,000 |
Increased the allowance for loan losses | 3,524,000 | 5,282,000 | 11,554,000 |  |  |  | 0
Allowances for loan losses |  |  |  |  |  |  | 0
Acquisition (Additional Textual) [Abstract] |  |  |  |  |  |  |
Net of allowance | $ 18,270,000 | $ 18,882,000 | $ 19,064,000 | $ 16,015,000 |  |  |

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- Definition Reflects the gross amount charged against earnings during the period as credit losses (bad debt expense) based on review of the loan and lease portfolio and application of the methodology for estimating credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 114 -Paragraph 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph d -Article 9 + Details
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- Definition The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -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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