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Accounting for Certain Loans Acquired in a Transfer - Amounts of Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Balance |  | $ 3,636,841
Allowance for Loan Losses | $ 48,440 | 17,667
Carrying Amount | $ 3,658,859 |
Loans Purchased With Evidence of Credit Deterioration |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding 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] |  |
Outstanding Balance |  | 10,205
Loans Purchased With Evidence of Credit Deterioration | Real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Balance |  | 3,443
Loans Purchased With Evidence of Credit Deterioration | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Balance |  | 982
Loans Purchased With Evidence of Credit Deterioration | Heartland |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding 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] |  |
Outstanding Balance |  | 197
Loans Purchased With Evidence of Credit Deterioration | Heartland | Real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Balance |  | 99
Loans Purchased With Evidence of Credit Deterioration | Heartland | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Balance |  | 0
Loans Purchased With Evidence of Credit Deterioration | Summit |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding 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] |  |
Outstanding Balance |  | 88
Loans Purchased With Evidence of Credit Deterioration | Summit | Real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Balance |  | 473
Loans Purchased With Evidence of Credit Deterioration | Summit | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Balance |  | 0
Loans Purchased With Evidence of Credit Deterioration | Peoples |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding 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] |  |
Outstanding Balance |  | 229
Loans Purchased With Evidence of Credit Deterioration | Peoples | Real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Balance |  | 35
Loans Purchased With Evidence of Credit Deterioration | Peoples | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Balance |  | 0
Loans Purchased With Evidence of Credit Deterioration | Kosciusko |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding 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] |  |
Outstanding Balance |  | 244
Loans Purchased With Evidence of Credit Deterioration | Kosciusko | Real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Balance |  | 131
Loans Purchased With Evidence of Credit Deterioration | Kosciusko | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Balance |  | 0
Loans Purchased With Evidence of Credit Deterioration | LaPorte |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding 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] |  |
Outstanding Balance |  | 353
Loans Purchased With Evidence of Credit Deterioration | LaPorte | Real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Balance |  | 793
Loans Purchased With Evidence of Credit Deterioration | LaPorte | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Balance |  | 20
Loans Purchased With Evidence of Credit Deterioration | Lafayette |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding 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] |  |
Outstanding Balance |  | 1,867
Loans Purchased With Evidence of Credit Deterioration | Lafayette | Real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Balance |  | 0
Loans Purchased With Evidence of Credit Deterioration | Lafayette | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Balance |  | 0
Loans Purchased With Evidence of Credit Deterioration | Wolverine |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding 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] |  |
Outstanding Balance |  | 2,289
Loans Purchased With Evidence of Credit Deterioration | Wolverine | Real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Balance |  | 0
Loans Purchased With Evidence of Credit Deterioration | Wolverine | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Balance |  | 0
Loans Purchased With Evidence of Credit Deterioration | Salin |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding 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] |  |
Outstanding Balance |  | 4,938
Loans Purchased With Evidence of Credit Deterioration | Salin | Real estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Balance |  | 1,912
Loans Purchased With Evidence of Credit Deterioration | Salin | Consumer |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Outstanding Balance |  | $ 962

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