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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	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 5,165	$ 3,457
Additions	0	3,200
Accretion	(1,448)	(1,176)
Reclassification from nonaccretable difference	0	0
Disposals	(1,065)	(316)
Ending balance	2,652	5,165
Heartland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	452	557
Additions	0	0
Accretion	(85)	(99)
Reclassification from nonaccretable difference	0	0
Disposals	(193)	(6)
Ending balance	174	452
Summit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	147	502
Additions	0	0
Accretion	(54)	(353)
Reclassification from nonaccretable difference	0	0
Disposals	(51)	(2)
Ending balance	42	147
Peoples Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	0	389
Additions		0
Accretion		(388)
Reclassification from nonaccretable difference		0
Disposals		(1)
Ending balance		0
Kosciusko Financial Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	386	530
Additions	0	0
Accretion	(78)	(101)
Reclassification from nonaccretable difference	0	0
Disposals	(8)	(43)
Ending balance	300	386
LaPorte Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	980	1,479
Additions	0	0
Accretion	(144)	(235)
Reclassification from nonaccretable difference	0	0
Disposals	(7)	(264)
Ending balance	829	980
Lafayette Community Bancorp [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	933	0
Additions	0	933
Accretion	(275)	0
Reclassification from nonaccretable difference	0	0
Disposals	(49)	0
Ending balance	609	933
Wolverine Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	2,267	0
Additions	0	2,267
Accretion	(812)	0
Reclassification from nonaccretable difference	0	0
Disposals	(757)	0
Ending balance	$ 698	$ 2,267

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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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