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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	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 5,165	$ 3,457
Additions	0	0
Accretion	(1,210)	(1,029)
Reclassification from nonaccretable difference	0	0
Disposals	(906)	(315)
Ending balance	3,049	2,113
Heartland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	452	557
Additions	0	0
Accretion	(77)	(99)
Reclassification from nonaccretable difference	0	0
Disposals	(193)	(6)
Ending balance	182	452
Summit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	147	502
Additions	0	0
Accretion	(48)	(268)
Reclassification from nonaccretable difference	0	0
Disposals	(9)	(2)
Ending balance	90	232
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	(60)	(80)
Reclassification from nonaccretable difference	0	0
Disposals		(42)
Ending balance	326	408
LaPorte Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	980	1,479
Additions	0	0
Accretion	(110)	(194)
Reclassification from nonaccretable difference	0	0
Disposals	(7)	(264)
Ending balance	863	$ 1,021
Lafayette Community Bancorp [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	933
Additions	0
Accretion	(229)
Reclassification from nonaccretable difference	0
Disposals	(16)
Ending balance	688
Wolverine Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	2,267
Additions	0
Accretion	(686)
Reclassification from nonaccretable difference	0
Disposals	(681)
Ending balance	$ 900

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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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