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Accounting for Certain Loans Acquired in a Transfer - Accretable Yield or Income Expected to be Collected (Detail) - Loans Purchased With Evidence of Credit Deterioration [Member] - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at January 1 | $ 3,457 | $ 2,058
Additions |  | 2,370
Accretion | (1,029) | (396)
Reclassification from nonaccretable difference | 0 | 0
Disposals | (315) | (191)
Balance at September 30 | 2,113 | 3,841
Heartland [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at January 1 | 557 | 795
Accretion | (99) | (127)
Reclassification from nonaccretable difference | 0 | 0
Disposals | (6) | (74)
Balance at September 30 | 452 | 594
Summit [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at January 1 | 502 | 708
Accretion | (268) | (139)
Reclassification from nonaccretable difference | 0 | 0
Disposals | (2) | (35)
Balance at September 30 | 232 | 534
Peoples Bancorp Inc [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at January 1 | 389 | 555
Accretion | (388) | (92)
Reclassification from nonaccretable difference | 0 | 0
Disposals | (1) | (59)
Balance at September 30 |  | 404
Kosciusko Financial Inc [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at January 1 | 530 |
Additions |  | 634
Accretion | (80) | (38)
Reclassification from nonaccretable difference | 0 | 0
Disposals | (42) | (23)
Balance at September 30 | 408 | 573
LaPorte Bancorp Inc [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at January 1 | 1,479 |
Additions |  | 1,736
Accretion | (194) |
Reclassification from nonaccretable difference | 0 | $ 0
Disposals | (264) |
Balance at September 30 | $ 1,021 |

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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 Amount of accretion recognized for 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 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)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition Amount of reduction, resulting from a sale or transfer of a loan, in 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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