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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 | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at January 1 | $ 3,457 | $ 2,058
Additions | 0 | 0
Accretion | (433) | (133)
Reclassification from nonaccretable difference | 0 | 0
Disposals | (119) | (44)
Balance at March 31 | 2,905 | 1,881
Heartland [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at January 1 | 557 | 795
Additions | 0 | 0
Accretion | (34) | (36)
Reclassification from nonaccretable difference | 0 | 0
Disposals | (6) | (10)
Balance at March 31 | 517 | 749
Summit [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at January 1 | 502 | 708
Additions | 0 | 0
Accretion | (93) | (55)
Reclassification from nonaccretable difference | 0 | 0
Disposals | (2) | (4)
Balance at March 31 | 407 | 649
Peoples Bancorp Inc [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at January 1 | 389 | 555
Additions | 0 | 0
Accretion | (194) | (42)
Reclassification from nonaccretable difference | 0 | 0
Disposals | (1) | (30)
Balance at March 31 | 194 | 483
Kosciusko Financial Inc [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at January 1 | 530 |
Additions | 0 | 0
Accretion | (31) |
Reclassification from nonaccretable difference | 0 | 0
Balance at March 31 | 499 |
LaPorte Bancorp Inc [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Balance at January 1 | 1,479 |
Additions | 0 | 0
Accretion | (81) |
Reclassification from nonaccretable difference | 0 | $ 0
Disposals | (110) |
Balance at March 31 | $ 1,288 |

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- Definition 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=6379141&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=27045933&loc=d3e13503-111538 + Details
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- Definition 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=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)(2) -URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544 + Details
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- Definition 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=6379141&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=27045933&loc=d3e13503-111538 + Details
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