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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, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at January 1	$ 3,457	$ 2,058
Additions	3,200	2,270
Accretion	(1,176)	(660)
Reclassification from nonaccretable difference	0
Disposals	(316)	(211)
Balance at December 31	5,165	3,457
Heartland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at January 1	557	795
Additions	0
Accretion	(99)	(164)
Reclassification from nonaccretable difference	0
Disposals	(6)	(74)
Balance at December 31	452	557
Summit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at January 1	502	708
Additions	0
Accretion	(353)	(171)
Reclassification from nonaccretable difference	0
Disposals	(2)	(35)
Balance at December 31	147	502
Peoples Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at January 1	389	555
Additions	0
Accretion	(388)	(106)
Reclassification from nonaccretable difference	0
Disposals	(1)	(60)
Balance at December 31	0	389
Kosciusko Financial Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at January 1	530
Additions	0	634
Accretion	(101)	(72)
Reclassification from nonaccretable difference	0
Disposals	(43)	(32)
Balance at December 31	386	530
LaPorte Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at January 1	1,479
Additions	0	1,636
Accretion	(235)	(147)
Reclassification from nonaccretable difference	0
Disposals	(264)	(10)
Balance at December 31	980	1,479
Lafayette Community Bancorp [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at January 1	0
Additions	933
Accretion	0
Reclassification from nonaccretable difference	0
Disposals	0
Balance at December 31	933	0
Wolverine Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at January 1	0
Additions	2,267
Accretion	0
Reclassification from nonaccretable difference	0
Disposals	0
Balance at December 31	$ 2,267	$ 0

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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Amount of additions to 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

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Amount of increase of reclassification from nonaccretable difference to 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 310
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