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Acquisitions - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 17, 2017 | Sep. 01, 2017 | Feb. 03, 2017 | Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Aug. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |
Common stock, shares outstanding |  |  |  | 38,294,729 | 38,362,640 |  |
Acquisition of goodwill |  |  |  | $ 119,880,000 | $ 119,880,000 |  |
Ownership interest percentage |  | 5.00% |  |  |  |  |
Payments received as cash consideration |  |  |  |  |  | $ (11,000,000) |
Wolverine Bancorp Inc [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Exchange ratio per share | 152.28% |  |  |  |  |  |
Cash paid for each share | $ 14.00 |  |  |  |  |  |
Common stock, shares outstanding | 2,129,331 |  |  |  |  |  |
Common stock issued | 3,241,045 |  |  |  |  |  |
Market closing price per share | $ 19.37 |  |  |  |  |  |
Estimated transaction value | $ 93,800,000 |  |  |  |  |  |
Costs related to the acquisition | 1,900,000 |  |  |  |  |  |
Total estimated purchase price | 93,773,000 |  |  |  |  |  |
Net intangible assets acquired | 2,024,000 |  |  |  |  |  |
Acquisition of goodwill | 26,827,000 |  |  |  |  |  |
Purchase price of the business assets, portion deductible | $ 0 |  |  |  |  |  |
Core deposit intangible amortization period |  |  |  |  | 10 years |  |
Lafayette Community Bancorp [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Exchange ratio per share |  | 88.17% |  |  |  |  |
Cash paid for each share |  | $ 1.73 |  |  |  |  |
Common stock, shares outstanding |  | 1,856,679 |  |  |  |  |
Common stock issued |  | 1,636,888 |  |  |  |  |
Market closing price per share |  |  |  |  |  |  | $ 17.45
Estimated transaction value |  |  |  |  |  |  | $ 34,500,000
Costs related to the acquisition |  | $ 1,700,000 |  |  |  |  |
Total estimated purchase price |  | 34,465,000 |  |  |  |  |
Net intangible assets acquired |  | 2,085,000 |  |  |  |  |
Acquisition of goodwill |  | 15,408,000 |  |  |  |  |
Purchase price of the business assets, portion deductible |  | $ 0 |  |  |  |  |
Core deposit intangible amortization period |  |  |  |  | 10 years |  |
Gain on remeasurement of equity interest |  |  |  | $ 530,000 |  |  |
Lafayette Community Bancorp [Member] | Maximum [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of shares owned |  | 100 |  |  |  |  |
Share of common stock outstanding per share |  | $ 17.25 |  |  |  |  |
First Farmers Bank & Trust Co [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Net intangible assets acquired |  |  | $ 452,000,000 |  |  |  |
Acquisition of goodwill |  |  | $ 0 |  |  |  |
Core deposit intangible amortization period |  |  | 10 years |  |  |  |
Payments received as cash consideration |  |  | $ 11,000,000 |  |  |  |
Business acquisition, loans assumed |  |  | $ 3,400,000 |  |  |  |
Premium on deposits paid |  |  | 3.00% |  |  |  |
Business acquisition, customer deposit balances |  |  | $ 14,800,000 |  |  |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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