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Loans - Accretable Yield or Income Expected to be Collected (Details) - Loans Purchased With Evidence of Credit Deterioration - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance $ 2,906 $ 2,652
Additions   2,002
Accretion   (1,203)
Reclassification from nonaccretable difference   0
Disposals   (545)
Ending balance   2,906
Heartland    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 142 174
Additions   0
Accretion   (32)
Reclassification from nonaccretable difference   0
Disposals   0
Ending balance   142
Summit    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 22 42
Additions   0
Accretion   (9)
Reclassification from nonaccretable difference   0
Disposals   (11)
Ending balance   22
Kosciusko    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 235 300
Additions   0
Accretion   (63)
Reclassification from nonaccretable difference   0
Disposals   (2)
Ending balance   235
LaPorte    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 722 829
Additions   0
Accretion   (111)
Reclassification from nonaccretable difference   0
Disposals   4
Ending balance   722
Lafayette    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 290 609
Additions   0
Accretion   (126)
Reclassification from nonaccretable difference   0
Disposals   (193)
Ending balance   290
Wolverine    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 120 698
Additions   0
Accretion   (272)
Reclassification from nonaccretable difference   0
Disposals   (306)
Ending balance   120
Salin    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Beginning balance 1,375 0
Additions 2,002  
Accretion (590)  
Reclassification from nonaccretable difference 0  
Disposals $ (37)  
Ending balance   $ 1,375