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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
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance $ 2,652 $ 5,165
Additions 2,002  
Accretion (1,203) (1,448)
Disposals (545) (1,065)
Ending balance 2,906 2,652
Heartland [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 174 452
Accretion (32) (85)
Disposals   (193)
Ending balance 142 174
Summit [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 42 147
Accretion (9) (54)
Disposals (11) (51)
Ending balance 22 42
Kosciusko Financial Inc [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 300 386
Accretion (63) (78)
Disposals (2) (8)
Ending balance 235 300
LaPorte Bancorp Inc [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 829 980
Accretion (111) (144)
Disposals 4 (7)
Ending balance 722 829
Lafayette Community Bancorp [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 609 933
Accretion (126) (275)
Disposals (193) (49)
Ending balance 290 609
Wolverine Bancorp Inc [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 698 2,267
Accretion (272) (812)
Disposals (306) (757)
Ending balance 120 $ 698
Salin Bank And Trust Company [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Additions 2,002  
Accretion (590)  
Disposals (37)  
Ending balance $ 1,375