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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
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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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