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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, 2019 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | $ 2,652 | $ 5,165
Additions | 2,002 |
Accretion | (1,203) | (1,448)
Disposals | (545) | (1,065)
Ending balance | 2,906 | 2,652
Heartland [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 174 | 452
Accretion | (32) | (85)
Disposals |  | (193)
Ending balance | 142 | 174
Summit [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 42 | 147
Accretion | (9) | (54)
Disposals | (11) | (51)
Ending balance | 22 | 42
Kosciusko Financial Inc [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 300 | 386
Accretion | (63) | (78)
Disposals | (2) | (8)
Ending balance | 235 | 300
LaPorte Bancorp Inc [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 829 | 980
Accretion | (111) | (144)
Disposals | 4 | (7)
Ending balance | 722 | 829
Lafayette Community Bancorp [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 609 | 933
Accretion | (126) | (275)
Disposals | (193) | (49)
Ending balance | 290 | 609
Wolverine Bancorp Inc [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Beginning balance | 698 | 2,267
Accretion | (272) | (812)
Disposals | (306) | (757)
Ending balance | 120 | $ 698
Salin Bank And Trust Company [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Additions | 2,002 |
Accretion | (590) |
Disposals | (37) |
Ending balance | $ 1,375 |

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- Definition Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Additions (Disposals) of Loans. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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://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=118938799&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=118939070&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=118938799&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=118939070&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=118938799&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=118939070&loc=d3e15032-111544 + Details
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