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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 |  |  |

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