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Acquisition (Details Textual) (USD $) | 3 Months Ended | 6 Months Ended |  |  |  |  |  | 6 Months Ended | 12 Months Ended |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Mar. 31, 2013 | Dec. 31, 2012 | Jul. 17, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2013 Heartland [Member] | Dec. 31, 2012 Heartland [Member] | Jul. 17, 2012 Heartland [Member] | Jun. 30, 2013 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 issued |  |  |  |  |  |  |  |  |  | 1,168,383 |  |  |
Common stock outstanding | 8,617,466 |  | 8,617,466 |  |  | 8,617,466 |  |  |  |  |  | 1,442,449 |
Net of allowance | 18,880,000 | 18,374,000 | 18,880,000 | 18,374,000 | 19,565,000 | 18,270,000 |  | 19,412,000 | 18,882,000 |  |  |  | 404,000
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 |
Total provision charged to operating expense | 729,000 | 209,000 | 2,813,000 | 768,000 |  |  |  |  |  |  |  |  | 1,500,000
Allowances for loan losses |  |  |  |  |  |  |  |  |  |  |  |  | $ 0

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