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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, 2017
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at January 1 $ 3,457 $ 2,058
Additions   2,370
Accretion (1,029) (396)
Reclassification from nonaccretable difference 0 0
Disposals (315) (191)
Balance at September 30 2,113 3,841
Heartland [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at January 1 557 795
Accretion (99) (127)
Reclassification from nonaccretable difference 0 0
Disposals (6) (74)
Balance at September 30 452 594
Summit [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at January 1 502 708
Accretion (268) (139)
Reclassification from nonaccretable difference 0 0
Disposals (2) (35)
Balance at September 30 232 534
Peoples Bancorp Inc [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at January 1 389 555
Accretion (388) (92)
Reclassification from nonaccretable difference 0 0
Disposals (1) (59)
Balance at September 30   404
Kosciusko Financial Inc [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at January 1 530  
Additions   634
Accretion (80) (38)
Reclassification from nonaccretable difference 0 0
Disposals (42) (23)
Balance at September 30 408 573
LaPorte Bancorp Inc [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at January 1 1,479  
Additions   1,736
Accretion (194)  
Reclassification from nonaccretable difference 0 $ 0
Disposals (264)  
Balance at September 30 $ 1,021