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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 17, 2017 | Sep. 01, 2017 | Nov. 07, 2016 | Jul. 18, 2016 | Jun. 01, 2016 | Jul. 01, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  |  | $ 42,939,000 | $ 27,341,000 |
Goodwill impairment loss |  |  |  |  |  |  | 0 | 0 |
Amortization expense for intangible assets totaled |  |  |  |  |  |  | 1,500,000 | $ 1,200,000 | $ 988,000
Peoples Bancorp Inc [Member] |  |  |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  |  | $ 21,400,000 |  |  |
Core deposit intangible amortization period |  |  |  |  |  |  |  |  | 10 years
Central National Bank & Trust [Member] |  |  |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Goodwill acquired |  |  | $ 609,000 |  |  |  |  |  |
Core deposit intangible amortization period |  |  |  |  |  |  |  | 10 years |
LaPorte Bancorp Inc [Member] |  |  |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  | $ 21,000,000 |  |  |  |  |
Core deposit intangible amortization period |  |  |  |  |  |  |  | 10 years |
Goodwill measurement period adjustment |  |  |  |  |  |  | $ 704,000 |  |
Kosciusko Financial Inc [Member] |  |  |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Goodwill acquired |  |  |  |  | $ 6,400,000 |  |  |  |
Core deposit intangible amortization period |  |  |  |  |  |  | 10 years |  |
Wolverine Bancorp Inc [Member] |  |  |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Goodwill acquired | $ 26,800,000 |  |  |  |  |  |  |  |
Core deposit intangible amortization period |  |  |  |  |  |  | 10 years |  |
Lafayette Community Bancorp [Member] |  |  |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Goodwill acquired |  | $ 15,400,000 |  |  |  |  |  |  |
Core deposit intangible amortization period |  |  |  |  |  |  | 10 years |  |
Core Deposits [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Core deposit intangible amortization period |  |  |  |  |  |  | 7 years |  |
Core Deposits [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |
Core deposit intangible amortization period |  |  |  |  |  |  | 10 years |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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