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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 | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | $ 2,652 | $ 5,165
Additions | 735 |
Accretion | (392) | (931)
Reclassification from nonaccretable difference |  |
Disposals | (312) | (888)
Ending balance | 2,683 | 3,346
Heartland [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 174 | 452
Additions |  |
Accretion | (16) | (68)
Reclassification from nonaccretable difference |  |
Disposals |  | (193)
Ending balance | 158 | 191
Summit [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 42 | 147
Additions |  |
Accretion | (5) | (34)
Reclassification from nonaccretable difference |  |
Disposals | (11) | (6)
Ending balance | 26 | 107
Kosciusko Financial Inc [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 300 | 386
Additions |  |
Accretion | (33) | (40)
Reclassification from nonaccretable difference |  |
Disposals | (1) |
Ending balance | 266 | 346
LaPorte Bancorp Inc [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 829 | 980
Additions |  |
Accretion | (59) | (75)
Reclassification from nonaccretable difference |  |
Disposals |  | (7)
Ending balance | 770 | 898
Lafayette Community Bancorp [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 609 | 933
Additions |  |
Accretion | (67) | (176)
Reclassification from nonaccretable difference |  |
Disposals | (180) | (2)
Ending balance | 362 | 755
Wolverine Bancorp Inc [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 698 | 2,267
Additions |  |
Accretion | (212) | (538)
Reclassification from nonaccretable difference |  |
Disposals | (120) | (680)
Ending balance | 366 | $ 1,049
Salin Bank and Trust Company [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance |  |
Additions | 735 |
Accretion |  |
Reclassification from nonaccretable difference |  |
Disposals |  |
Ending balance | $ 735 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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