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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	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$ 2,652	$ 5,165
Additions	735
Accretion	(392)	(931)
Reclassification from nonaccretable difference
Disposals	(312)	(888)
Ending balance	2,683	3,346
Heartland [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	174	452
Additions
Accretion	(16)	(68)
Reclassification from nonaccretable difference
Disposals		(193)
Ending balance	158	191
Summit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	42	147
Additions
Accretion	(5)	(34)
Reclassification from nonaccretable difference
Disposals	(11)	(6)
Ending balance	26	107
Kosciusko Financial Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	300	386
Additions
Accretion	(33)	(40)
Reclassification from nonaccretable difference
Disposals	(1)
Ending balance	266	346
LaPorte Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	829	980
Additions
Accretion	(59)	(75)
Reclassification from nonaccretable difference
Disposals		(7)
Ending balance	770	898
Lafayette Community Bancorp [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	609	933
Additions
Accretion	(67)	(176)
Reclassification from nonaccretable difference
Disposals	(180)	(2)
Ending balance	362	755
Wolverine Bancorp Inc [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	698	2,267
Additions
Accretion	(212)	(538)
Reclassification from nonaccretable difference
Disposals	(120)	(680)
Ending balance	366	$ 1,049
Salin Bank and Trust Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance
Additions	735
Accretion
Reclassification from nonaccretable difference
Disposals
Ending balance	$ 735

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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.

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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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