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Loans and Allowance - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Receivables [Abstract] |  |  |  |
Loans held for sale | $ 5,039 |  | $ 9,037 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 8,606,849 |  | 8,459,310 |
Loans - allowance for loan losses | 99,454 | $ 80,902 | 80,284 | $ 80,552
Residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 1,691,954 |  | 1,732,201 |
Loans - allowance for loan losses | 17,364 | $ 14,373 | 14,569 | $ 14,322
Percentage of troubled debt restructured loans |  | 100.00% |  |
Mortgage loans with formal foreclosure proceedings | 507 |  | 1,033 |
Loans acquired with deteriorated credit quality |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 10,586 |  | 13,309 |
Loans acquired with deteriorated credit quality | Commercial and consumer loan |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 2,697 |  | 2,819 |
Loans - allowance for loan losses | 124 |  | 124 |
Loans acquired with deteriorated credit quality | Residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 1,719 |  | 1,715 |
30-59 Days Past Due |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past Due | 100,677 |  | 14,683 |
Past Due increase | 85,994 |  |  |
30-59 Days Past Due | Residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Past Due | $ 4,536 |  | $ 4,290 |

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