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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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Intangible Assets [Line Items]

+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
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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

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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

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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

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Amount of increase (decrease) from adjustments after acquisition date under purchase accounting 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.

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