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Accounting for Certain Loans Acquired in a Transfer - Accretable Yield or Income Expected to be Collected (Detail) - Loans Purchased With Evidence of Credit Deterioration [Member] - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 5,165	$ 3,457
Additions	0	0
Accretion	(931)	(845)
Reclassification from nonaccretable difference	0	0
Disposals	(888)	(180)
Ending balance	3,346	2,432
Heartland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	452	557
Additions	0	0
Accretion	(68)	(67)
Reclassification from nonaccretable difference	0	0
Disposals	(193)	(6)
Ending balance	191	484
Summit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	147	502
Additions	0	0
Accretion	(34)	(182)
Reclassification from nonaccretable difference	0	0
Disposals	(6)	(2)
Ending balance	107	318
Peoples Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance		389
Additions		0
Accretion		(388)
Reclassification from nonaccretable difference		0
Disposals		(1)
Kosciusko Financial Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	386	530
Additions	0	0
Accretion	(40)	(58)
Reclassification from nonaccretable difference	0	0
Disposals		(18)
Ending balance	346	454
LaPorte Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	980	1,479
Additions	0	0
Accretion	(75)	(150)
Reclassification from nonaccretable difference	0	0
Disposals	(7)	(153)
Ending balance	898	$ 1,176
Lafayette Community Bancorp [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	933
Additions	0
Accretion	(176)
Reclassification from nonaccretable difference	0
Disposals	(2)
Ending balance	755
Wolverine Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	2,267
Additions	0
Accretion	(538)
Reclassification from nonaccretable difference	0
Disposals	(680)
Ending balance	$ 1,049

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Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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Amount of accretion recognized for the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality.

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Amount of reduction, resulting from a sale or transfer of a loan, in the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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