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Loans and Allowance - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Receivables [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Loans held for sale | $ 3,966 |  |  |  | $ 9,037 |  |  |  | $ 3,966 | $ 9,037 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of funded loans (over) | loan |  |  |  |  |  |  |  |  | 4,400 |  |  |
Interest income |  |  |  |  |  |  |  |  | $ 358,264 | 382,772 | $ 342,501 |
Loans - allowance for loan losses | 130,648 |  |  |  | 80,284 |  |  |  | 130,648 | 80,284 | 80,552 | $ 75,032
Increase in allowance for loan losses |  |  |  |  |  |  |  |  | 50,300 |  |  |
Net charge offs |  |  |  |  |  |  |  |  | 8,300 |  |  |
Increase in net charge offs |  |  |  |  |  |  |  |  | 5,200 |  |  |
Provision for loan losses | 4,482 | $ 12,544 | $ 21,895 | $ 19,752 | 500 | $ 600 | $ 500 | $ 1,200 | 58,673 | 2,800 | 7,227 |
Increase in provision for loan losses |  |  |  |  |  |  |  |  | 55,900 |  |  |
Loans | 9,243,174 |  |  |  | 8,459,310 |  |  |  | 9,243,174 | 8,459,310 |  |
Loans acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans | 6,161 |  |  |  | 13,309 |  |  |  | 6,161 | 13,309 |  |
PPP, CARES Act |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans net of deferred fees | 667,100 |  |  |  |  |  |  |  | 667,100 |  |  |
Deferred fees | 12,500 |  |  |  |  |  |  |  | $ 12,500 |  |  |
Weighted-average deferred processing fee |  |  |  |  |  |  |  |  | 3.09% |  |  |
Interest income |  |  |  |  |  |  |  |  | $ 6,200 |  |  |
Deferred processing fee income |  |  |  |  |  |  |  |  | 16,200 |  |  |
Commercial and consumer loan | Loans acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans - allowance for loan losses | 557 |  |  |  | 124 |  |  |  | 557 | 124 |  |
Loans | 1,300 |  |  |  | 2,800 |  |  |  | 1,300 | 2,800 |  |
Residential |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans - allowance for loan losses | 22,815 |  |  |  | 14,569 |  |  |  | 22,815 | 14,569 | 14,322 | $ 13,537
Provision for loan losses |  |  |  |  |  |  |  |  | 8,573 | 273 | $ 1,969 |
Loans | 1,743,000 |  |  |  | 1,732,201 |  |  |  | $ 1,743,000 | $ 1,732,201 |  |
Percentage of troubled debt restructured loans |  |  |  |  |  |  |  |  | 70.00% | 100.00% |  |
Mortgage loans for which formal foreclosure proceedings are in process | 2,800 |  |  |  | 1,000 |  |  |  | $ 2,800 | $ 1,000 |  |
Residential | Loans acquired with deteriorated credit quality |  |  |  |  |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loans | $ 0 |  |  |  | $ 1,715 |  |  |  | $ 0 | $ 1,715 |  |

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