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Acquisitions - Schedule of Purchase Price of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 01, 2017
--- | --- | --- | ---
Loans |  |  |
Goodwill | $ 119,880 | $ 119,880 |
Lafayette Community Bancorp [Member] |  |  |
Assets |  |  |
Cash and due from banks |  |  | $ 24,846
Investment securities, available for sale |  |  | 6
Loans |  |  |
Total loans |  |  | 134,299
Premises and equipment, net |  |  | 7,818
FHLB stock |  |  | 395
Goodwill |  |  | 15,408
Core deposit intangible |  |  | 2,085
Interest receivable |  |  | 338
Other assets |  |  | 1,649
Total assets purchased |  |  | 186,844
Common shares issued |  |  | 30,044
Cash paid |  |  | 4,421
Total estimated purchase price |  |  | 34,465
Deposits |  |  |
Non-interest bearing |  |  | 34,990
NOW accounts |  |  | 30,174
Savings and money market |  |  | 53,663
Certificates of deposit |  |  | 32,520
Total deposits |  |  | 151,347
Interest payable |  |  | 42
Other liabilities |  |  | 990
Total liabilities assumed |  |  | 152,379
Lafayette Community Bancorp [Member] | Residential Mortgage [Member] |  |  |
Loans |  |  |
Total loans |  |  | 12,761
Lafayette Community Bancorp [Member] | Commercial [Member] |  |  |
Loans |  |  |
Total loans |  |  | 116,258
Lafayette Community Bancorp [Member] | Consumer [Member] |  |  |
Loans |  |  |
Total loans |  |  | $ 5,280

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