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Acquisitions - Schedule of Acquired Loans Accounted for in Accordance with ASC 310-30 (Detail) - USD ($) $ in Thousands | Oct. 17, 2017 | Sep. 01, 2017 | Jul. 18, 2016 | Jun. 01, 2016
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LaPorte Bancorp Inc [Member] |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |
Contractually required principal and interest at acquisition |  |  | $ 12,545 |
Contractual cash flows not expected to be collected (nonaccretable differences) |  |  | 4,492 |
Expected cash flows at acquisition |  |  | 8,053 |
Interest component of expected cash flows (accretable discount) |  |  | 1,258 |
Fair value of acquired loans accounted for under ASC 310-30 |  |  | $ 6,795 |
Kosciusko Financial Inc [Member] |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |
Contractually required principal and interest at acquisition |  |  |  | $ 2,682
Contractual cash flows not expected to be collected (nonaccretable differences) |  |  |  | 25
Expected cash flows at acquisition |  |  |  | 2,657
Interest component of expected cash flows (accretable discount) |  |  |  | 634
Fair value of acquired loans accounted for under ASC 310-30 |  |  |  | $ 2,023
Wolverine Bancorp Inc [Member] |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |
Contractually required principal and interest at acquisition | $ 21,912 |  |  |
Contractual cash flows not expected to be collected (nonaccretable differences) | 1,832 |  |  |
Expected cash flows at acquisition | 20,080 |  |  |
Interest component of expected cash flows (accretable discount) | 2,267 |  |  |
Fair value of acquired loans accounted for under ASC 310-30 | $ 17,813 |  |  |
Lafayette Community Bancorp [Member] |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |  |  |  |
Contractually required principal and interest at acquisition |  | $ 6,128 |  |
Contractual cash flows not expected to be collected (nonaccretable differences) |  | 1,326 |  |
Expected cash flows at acquisition |  | 4,802 |  |
Interest component of expected cash flows (accretable discount) |  | 933 |  |
Fair value of acquired loans accounted for under ASC 310-30 |  | $ 3,869 |  |

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