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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, 2016
Sep. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at January 1 $ 2,058 $ 3,668
Additions 2,370 647
Accretion (396) (526)
Reclassification from nonaccretable difference 0 0
Disposals (191) (1,447)
Balance at September 30 3,841 2,342
Heartland [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at January 1 795 2,400
Accretion (127) (272)
Reclassification from nonaccretable difference 0 0
Disposals (74) (1,210)
Balance at September 30 594 918
Summit [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at January 1 708 1,268
Accretion (139) (254)
Reclassification from nonaccretable difference 0 0
Disposals (35) (237)
Balance at September 30 534 777
Peoples Bancorp Inc [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at January 1 555  
Additions   647
Accretion (92)  
Reclassification from nonaccretable difference 0 0
Disposals (59)  
Balance at September 30 404 647
Kosciusko Financial Inc [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Additions 634  
Accretion (38)  
Reclassification from nonaccretable difference 0 0
Disposals (23)  
Balance at September 30 573  
LaPorte Bancorp Inc [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Additions 1,736  
Reclassification from nonaccretable difference 0 $ 0
Balance at September 30 $ 1,736