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Acquisitions - Schedule of Acquired Loans Accounted for in Accordance with ASC 310-30 (Detail) - USD ($) $ in Thousands	Oct. 17, 2017	Sep. 01, 2017	Jul. 18, 2016	Jun. 01, 2016	Jul. 01, 2015
LaPorte Bancorp Inc [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required principal and interest at acquisition			$ 12,545
Contractual cash flows not expected to be collected (nonaccretable differences)			4,492
Expected cash flows at acquisition			8,053
Interest component of expected cash flows (accretable discount)			1,258
Fair value of acquired loans accounted for under ASC 310-30			$ 6,795
Kosciusko Financial Inc [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required principal and interest at acquisition				$ 2,682
Contractual cash flows not expected to be collected (nonaccretable differences)				25
Expected cash flows at acquisition				2,657
Interest component of expected cash flows (accretable discount)				634
Fair value of acquired loans accounted for under ASC 310-30				$ 2,023
Peoples Bancorp Inc [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required principal and interest at acquisition					$ 5,730
Contractual cash flows not expected to be collected (nonaccretable differences)					715
Expected cash flows at acquisition					5,015
Interest component of expected cash flows (accretable discount)					647
Fair value of acquired loans accounted for under ASC 310-30					$ 4,368
Wolverine Bancorp Inc [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required principal and interest at acquisition	$ 21,912
Contractual cash flows not expected to be collected (nonaccretable differences)	1,832
Expected cash flows at acquisition	20,080
Interest component of expected cash flows (accretable discount)	2,267
Fair value of acquired loans accounted for under ASC 310-30	$ 17,813
Lafayette Community Bancorp [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required principal and interest at acquisition		$ 6,128
Contractual cash flows not expected to be collected (nonaccretable differences)		1,326
Expected cash flows at acquisition		4,802
Interest component of expected cash flows (accretable discount)		933
Fair value of acquired loans accounted for under ASC 310-30		$ 3,869

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Certain loans acquired in transfer not accounted for as debt securities acquired during period interest component of expected cash flows.

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+ 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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-Section 50
-Paragraph 2
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

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