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Acquisition - Additional Information (Detail) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jul. 17, 2012
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock outstanding | 8,630,966 |  |  |  | 8,617,466 |  |  |  | 8,630,966 | 8,617,466 |  |
Net intangible assets acquired |  |  |  |  |  |  |  |  |  |  |  | $ 2,332,000
Acquisition of goodwill | 19,748,000 |  |  |  | 19,748,000 |  |  |  | 19,748,000 | 19,748,000 |  | 13,838,000
Purchase price of the business assets |  |  |  |  |  |  |  |  |  |  |  | 2,647,000
Total provision charged to operating expense | (997,000) | 104,000 | 729,000 | 2,084,000 | 1,715,000 | 1,041,000 | 209,000 | 559,000 | 1,920,000 | 3,524,000 | 5,282,000 |
Heartland [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Date of acquisition agreement |  |  |  |  |  |  |  |  | Jul. 17, 2012 |  |  |
Exchange ratio per share to Heartland shareholder |  |  |  |  |  |  |  |  |  |  |  | $ 0.81
Common stock outstanding |  |  |  |  |  |  |  |  |  |  |  | 1,442,449
Common stock issued |  |  |  |  |  |  |  |  | 1,168,383 |  |  |
Market closing price per share |  |  |  |  |  |  |  |  |  |  |  | $ 16.83
Transaction value is estimated |  |  |  |  |  |  |  |  |  |  |  | 26,900,000
Costs related to the acquisition |  |  |  |  |  |  |  |  |  | 1,500,000 |  |
Net tangible assets acquired |  |  |  |  |  |  |  |  |  |  |  | 26,900,000
Net intangible assets acquired |  |  |  |  |  |  |  |  |  |  |  | 2,300,000
Acquisition of goodwill |  |  |  |  |  |  |  |  |  |  |  | 13,838,000
Purchase price of the business assets |  |  |  |  |  |  |  |  |  |  |  | 10,800,000
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
Heartland Bancshares Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total provision charged to operating expense |  |  |  |  |  |  |  |  | 2,600,000 | 0 |  |
Allowances for loan losses |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 + 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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