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Accounting for Certain Loans Acquired in a Transfer - Amounts of Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Jun. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance $ 4,030,365     $ 3,634,596      
Allowance for Loan Losses 56,319 $ 55,090 $ 22,577 17,667 $ 17,956 $ 18,305 $ 17,820
Carrying Amount 3,974,046            
Commercial              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance 2,321,608     2,047,646      
Allowance for Loan Losses 39,795 39,147   11,996 12,082 11,881 10,495
Real estate              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance 1,049,873     920,998      
Allowance for Loan Losses 5,464 5,832   923 1,449 1,732 1,676
Consumer              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance 658,884     665,952      
Allowance for Loan Losses $ 9,810 $ 8,921   3,671 $ 3,384 $ 3,652 $ 4,643
Loans Purchased With Evidence of Credit Deterioration              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       14,630      
Allowance for Loan Losses       133      
Carrying Amount       14,497      
Loans Purchased With Evidence of Credit Deterioration | Commercial              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       10,205      
Loans Purchased With Evidence of Credit Deterioration | Real estate              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       3,443      
Loans Purchased With Evidence of Credit Deterioration | Consumer              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       982      
Loans Purchased With Evidence of Credit Deterioration | Heartland              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       296      
Allowance for Loan Losses       0      
Carrying Amount       296      
Loans Purchased With Evidence of Credit Deterioration | Heartland | Commercial              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       197      
Loans Purchased With Evidence of Credit Deterioration | Heartland | Real estate              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       99      
Loans Purchased With Evidence of Credit Deterioration | Heartland | Consumer              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       0      
Loans Purchased With Evidence of Credit Deterioration | Summit              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       561      
Allowance for Loan Losses       0      
Carrying Amount       561      
Loans Purchased With Evidence of Credit Deterioration | Summit | Commercial              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       88      
Loans Purchased With Evidence of Credit Deterioration | Summit | Real estate              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       473      
Loans Purchased With Evidence of Credit Deterioration | Summit | Consumer              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       0      
Loans Purchased With Evidence of Credit Deterioration | Peoples              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       264      
Allowance for Loan Losses       0      
Carrying Amount       264      
Loans Purchased With Evidence of Credit Deterioration | Peoples | Commercial              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       229      
Loans Purchased With Evidence of Credit Deterioration | Peoples | Real estate              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       35      
Loans Purchased With Evidence of Credit Deterioration | Peoples | Consumer              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       0      
Loans Purchased With Evidence of Credit Deterioration | Kosciusko              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       375      
Allowance for Loan Losses       0      
Carrying Amount       375      
Loans Purchased With Evidence of Credit Deterioration | Kosciusko | Commercial              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       244      
Loans Purchased With Evidence of Credit Deterioration | Kosciusko | Real estate              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       131      
Loans Purchased With Evidence of Credit Deterioration | Kosciusko | Consumer              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       0      
Loans Purchased With Evidence of Credit Deterioration | LaPorte              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       1,166      
Allowance for Loan Losses       0      
Carrying Amount       1,166      
Loans Purchased With Evidence of Credit Deterioration | LaPorte | Commercial              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       353      
Loans Purchased With Evidence of Credit Deterioration | LaPorte | Real estate              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       793      
Loans Purchased With Evidence of Credit Deterioration | LaPorte | Consumer              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       20      
Loans Purchased With Evidence of Credit Deterioration | Lafayette              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       1,867      
Allowance for Loan Losses       0      
Carrying Amount       1,867      
Loans Purchased With Evidence of Credit Deterioration | Lafayette | Commercial              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       1,867      
Loans Purchased With Evidence of Credit Deterioration | Lafayette | Real estate              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       0      
Loans Purchased With Evidence of Credit Deterioration | Lafayette | Consumer              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       0      
Loans Purchased With Evidence of Credit Deterioration | Wolverine              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       2,289      
Allowance for Loan Losses       0      
Carrying Amount       2,289      
Loans Purchased With Evidence of Credit Deterioration | Wolverine | Commercial              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       2,289      
Loans Purchased With Evidence of Credit Deterioration | Wolverine | Real estate              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       0      
Loans Purchased With Evidence of Credit Deterioration | Wolverine | Consumer              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       0      
Loans Purchased With Evidence of Credit Deterioration | Salin              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       7,812      
Allowance for Loan Losses       133      
Carrying Amount       7,679      
Loans Purchased With Evidence of Credit Deterioration | Salin | Commercial              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       4,938      
Loans Purchased With Evidence of Credit Deterioration | Salin | Real estate              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       1,912      
Loans Purchased With Evidence of Credit Deterioration | Salin | Consumer              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan Balance       $ 962