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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	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 2,652	$ 5,165
Additions	2,002
Accretion	(880)	(931)
Reclassification from nonaccretable difference
Disposals	(538)	(888)
Ending balance	3,236	3,346
Heartland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	174	452
Additions
Accretion	(24)	(68)
Reclassification from nonaccretable difference
Disposals		(193)
Ending balance	150	191
Summit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	42	147
Additions
Accretion	(7)	(34)
Reclassification from nonaccretable difference
Disposals	(11)	(6)
Ending balance	24	107
Kosciusko Financial Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	300	386
Additions
Accretion	(49)	(40)
Reclassification from nonaccretable difference
Disposals	(2)
Ending balance	249	346
LaPorte Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	829	980
Additions
Accretion	(85)	(75)
Reclassification from nonaccretable difference
Disposals	4	(7)
Ending balance	748	898
Lafayette Community Bancorp [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	609	933
Additions
Accretion	(97)	(176)
Reclassification from nonaccretable difference
Disposals	(193)	(2)
Ending balance	319	755
Wolverine Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	698	2,267
Additions
Accretion	(243)	(538)
Reclassification from nonaccretable difference
Disposals	(306)	(680)
Ending balance	149	$ 1,049
Salin Bank and Trust Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	0
Additions	2,002
Accretion	(375)
Reclassification from nonaccretable difference
Disposals	(30)
Ending balance	$ 1,597

X

- Definition

Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Additions (Disposals) of Loans.

+ References

No definition available.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
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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 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.

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