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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, 2019	Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 2,652	$ 5,165
Additions	3,368
Accretion	(215)	(642)
Disposals	(190)	(53)
Ending balance	5,615	4,470
Heartland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	174	452
Accretion	(8)	(59)
Ending balance	166	393
Summit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	42	147
Accretion	(3)	(18)
Disposals	(11)	(2)
Ending balance	28	127
Kosciusko Financial Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	300	386
Accretion	(17)	(20)
Ending balance	283	366
LaPorte Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	829	980
Accretion	(29)	(40)
Disposals		(7)
Ending balance	800	933
Lafayette Community Bancorp [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	609	933
Accretion	(35)	(118)
Disposals	(171)	(2)
Ending balance	403	813
Wolverine Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	698	2,267
Accretion	(123)	(387)
Disposals	(8)	(42)
Ending balance	567	$ 1,838
Salin Bank and Trust Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Additions	3,368
Ending balance	$ 3,368

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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

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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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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.

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