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Acquisitions - Schedule of Final Purchase Price of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Oct. 17, 2017
--- | --- | --- | ---
Loans |  |  |
Goodwill | $ 119,880 | $ 119,880 |
Wolverine Bancorp Inc [Member] |  |  |
Assets |  |  |
Cash and due from banks |  |  | $ 44,450
Loans |  |  |
Total loans |  |  | 310,667
Premises and equipment, net |  |  | 2,941
FRB and FHLB stock |  |  | 2,700
Goodwill |  |  | 26,827
Core deposit intangible |  |  | 2,024
Interest receivable |  |  | 584
Other assets |  |  | 3,897
Total assets purchased |  |  | 394,090
Common shares issued |  |  | 62,111
Cash paid |  |  | 31,662
Total estimated purchase price |  |  | 93,773
Deposits |  |  |
Non-interest bearing |  |  | 25,221
NOW accounts |  |  | 8,026
Savings and money market |  |  | 129,044
Certificates of deposit |  |  | 94,688
Total deposits |  |  | 256,979
Borrowings |  |  | 36,970
Interest payable |  |  | 214
Other liabilities |  |  | 6,154
Total liabilities assumed |  |  | 300,317
Wolverine Bancorp Inc [Member] | Residential Mortgage [Member] |  |  |
Loans |  |  |
Total loans |  |  | 30,603
Wolverine Bancorp Inc [Member] | Commercial [Member] |  |  |
Loans |  |  |
Total loans |  |  | 276,167
Wolverine Bancorp Inc [Member] | Consumer [Member] |  |  |
Loans |  |  |
Total loans |  |  | $ 3,897

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