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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 | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at January 1 | $ 3,457 | $ 2,058
Additions | 3,200 | 2,270
Accretion | (1,176) | (660)
Reclassification from nonaccretable difference | 0 |
Disposals | (316) | (211)
Balance at December 31 | 5,165 | 3,457
Heartland [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at January 1 | 557 | 795
Additions | 0 |
Accretion | (99) | (164)
Reclassification from nonaccretable difference | 0 |
Disposals | (6) | (74)
Balance at December 31 | 452 | 557
Summit [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at January 1 | 502 | 708
Additions | 0 |
Accretion | (353) | (171)
Reclassification from nonaccretable difference | 0 |
Disposals | (2) | (35)
Balance at December 31 | 147 | 502
Peoples Bancorp Inc [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at January 1 | 389 | 555
Additions | 0 |
Accretion | (388) | (106)
Reclassification from nonaccretable difference | 0 |
Disposals | (1) | (60)
Balance at December 31 | 0 | 389
Kosciusko Financial Inc [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at January 1 | 530 |
Additions | 0 | 634
Accretion | (101) | (72)
Reclassification from nonaccretable difference | 0 |
Disposals | (43) | (32)
Balance at December 31 | 386 | 530
LaPorte Bancorp Inc [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at January 1 | 1,479 |
Additions | 0 | 1,636
Accretion | (235) | (147)
Reclassification from nonaccretable difference | 0 |
Disposals | (264) | (10)
Balance at December 31 | 980 | 1,479
Lafayette Community Bancorp [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at January 1 | 0 |
Additions | 933 |
Accretion | 0 |
Reclassification from nonaccretable difference | 0 |
Disposals | 0 |
Balance at December 31 | 933 | 0
Wolverine Bancorp Inc [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at January 1 | 0 |
Additions | 2,267 |
Accretion | 0 |
Reclassification from nonaccretable difference | 0 |
Disposals | 0 |
Balance at December 31 | $ 2,267 | $ 0

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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 additions to 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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