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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	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Intangible Assets [Line Items]
Goodwill acquired							$ 42,939,000
Goodwill impairment loss						$ 0	0
Amortization expense for intangible assets totaled						$ 2,000,000	1,500,000	$ 1,200,000
Peoples Bancorp Inc [Member]
Intangible Assets [Line Items]
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]

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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.

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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.

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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.

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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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