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LOANS AND LEASES - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Apr. 01, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Purchased impaired loans | $ 117,155,000 |  | $ 117,155,000 |  |  |  | $ 104,960,000 |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield |  |  |  |  | $ 1,200,000 |  |  |  |
Certain Loans Acquired in Transfer, Nonaccretable Difference |  |  |  |  | 2,700,000 |  |  |  |
Restructured Loans, Nonaccrual Status | 5,900,000 |  | 5,900,000 |  |  |  | 6,400,000 |  |
Write-downs | 139,000 | $ 172,000 | 262,000 | $ 281,000 |  |  |  |  |
Gain (loss) on sale of other real estate owned | 283,000 | (162,000) | 206,000 | (186,000) |  |  |  |  |
Real Estate Acquired Through Foreclosure | 1,853,000 | 5,961,000 | 1,853,000 | 5,961,000 |  | $ 1,065,000 | $ 2,781,000 | $ 5,300,000 | $ 6,284,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, at Acquisition, at Fair Value |  |  |  |  | 2,700,000,000 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition |  |  |  |  | $ 2,900,000,000 |  |  |  |
Commercial |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum |  |  | 250,000 |  |  |  |  |  |
Residential real estate |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum |  |  | 250,000 |  |  |  |  |  |
Write-downs | 139,000 | $ 56,000 | 165,000 | $ 119,000 |  |  |  |  |
MainSource [Member] |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |
Purchased impaired loans | $ 24,100,000 |  | $ 24,100,000 |  |  |  |  |  |

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- Definition Carrying balance/book balance of purchased impaired loans accounting for under FASB ASC Topic 310-30. + References No definition available. + Details
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- Definition Restructured Loans, Loan Relationships, Review Threshold Amount Minimum for commercial and other loans greater than $250,000 + References No definition available. + Details
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- Definition The amount of the loan's contractually required payments receivable in excess of the amount of its cash flows expected to be collected. This relates to loans with deteriorating 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 No definition available. + Details
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- Definition Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 2: 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=82894507&loc=d3e13503-111538 + Details
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- Definition Fair value at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + 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=82894507&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=82894903&loc=d3e15032-111544 + Details
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- Definition Amount of contractually required payments receivable at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: 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=82894903&loc=d3e15032-111544 Reference 2: 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=82894507&loc=d3e13503-111538 + Details
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- Definition The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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