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LOANS AND LEASES - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Restructured Loans, Portion Determined to be Uncollectible | $ 700,000 | $ 100,000 |  | $ 200,000 |  |  |  |
Purchased impaired loans | 105,022,000 |  | $ 105,022,000 |  |  | $ 104,960,000 |  |
Restructured Loans, Nonaccrual Status | 4,700,000 |  | 4,700,000 |  |  | 6,400,000 |  |
Write-downs | 455,000 | 134,000 | 717,000 | 415,000 |  |  |  |
Gain (loss) on sale of other real estate owned | (538,000) | (237,000) | (332,000) | (423,000) |  |  |  |
Real Estate Acquired Through Foreclosure | 1,918,000 | 3,116,000 | 1,918,000 | 3,116,000 | $ 1,853,000 | $ 2,781,000 | $ 5,961,000 | $ 6,284,000
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 | 197,000 | $ 32,000 | 362,000 | $ 151,000 |  |  |  |
MainSource [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Purchased impaired loans | $ 18,000,000.0 |  | $ 18,000,000.0 |  |  |  |  |

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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 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14(d)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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- Definition Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5162-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4437-111522 + Details
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