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Business Combinations Assets Acquired and Liabilities Assumed (Details) - First Clover Leaf [Member] - USD ($) |  | 3 Months Ended
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Sep. 08, 2016 | Mar. 31, 2017
Business Acquisition [Line Items] |  |
Business Combination Recognized Identifiable Assets Acquired and LIabilities Assumed, cash on hand | $ 59,320,000 |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities | (109,174,000) |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans | (438,265,000) |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses | 0 |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets | (1,987,000) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment | (11,581,000) |
Business Acquisition, Goodwill, Non-deductible Amount | 16,785,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 4,660,000 |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets | (27,133,000) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 668,905,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits | 536,686,000 |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase | 23,263,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances | 15,113,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures | 3,269,000 |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities | 2,103,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 580,434,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 88,471,000 |
Aggregate Total Of Cash Paid In Business Combination | 22,545,000 |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned | 65,926,000 |
Business Combination, Value of Total Consideration Paid | 88,471,000 |
Business Combination, Aggregate Acquisition Costs |  | $ 3,085,000
Business Combination, Acquisition Related Costs |  | $ 1,745,000
Finite-Lived Intangible Asset, Useful Life |  | 10 years
Acquired Book Value [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination Recognized Identifiable Assets Acquired and LIabilities Assumed, cash on hand | 59,320,000 |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities | (109,911,000) |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans | (448,668,000) |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses | (6,928,000) |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets | (2,741,000) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment | (9,618,000) |
Business Acquisition, Goodwill, Non-deductible Amount | 11,385,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 99,000 |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets | (23,974,000) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 658,788,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits | 534,692,000 |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase | 23,263,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances | 15,000,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures | 4,000,000 |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities | 2,103,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 579,058,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 79,730,000 |
Fair Value Adjustment [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination Recognized Identifiable Assets Acquired and LIabilities Assumed, cash on hand | 0 |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Securities | (737,000) |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans | (10,403,000) |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses | (6,928,000) |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Repossessed Assets | (754,000) |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Premises And Equipment | 1,963,000 |
Business Acquisition, Goodwill, Non-deductible Amount | 5,400,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | 4,561,000 |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Assets | 3,159,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 10,117,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits | 1,994,000 |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Securities Sold Under Agreements to Repurchase | 0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances | 113,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debentures | (731,000) |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Other Liabilities | 0 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 1,376,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 8,741,000 |
Fair Value Adjustments, Accretable portion [Member] |  |
Business Acquisition [Line Items] |  |
Business Combination, Recognized Identifiable Assets and Liabilities Assumed, Loans | $ 8,400,000 |

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- Definition Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed Allowance For Loan Losses + References No definition available. + Details
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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=73531572&loc=d3e1043-128460 + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + 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=73530397&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=73530397&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=73530397&loc=d3e4845-128472 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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