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Acquisitions - Schedule of Acquired Loans Accounted for in Accordance with ASC 310-30 (Detail) - USD ($) $ in Thousands	Jul. 18, 2016	Jun. 01, 2016	Jul. 01, 2015	Apr. 03, 2014
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
Summit [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required principal and interest at acquisition				$ 14,460
Contractual cash flows not expected to be collected (nonaccretable differences)				3,146
Expected cash flows at acquisition				11,314
Interest component of expected cash flows (accretable discount)				1,688
Fair value of acquired loans accounted for under ASC 310-30				$ 9,626

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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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Fair value at acquisition of 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=27045933&loc=d3e13503-111538

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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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 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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