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Loans - Loans Outstanding by Portfolio Class (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | $ 3,660,081 |  | $ 3,867,383 |  |  |
Allowance for credit losses | (56,779) | $ (55,649) | (57,027) | $ (56,319) | $ (55,090) | $ (17,667)
Net loans | 3,603,302 |  | 3,810,356 |  |  |
Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 2,173,200 |  | 2,192,271 |  |  |
Allowance for credit losses | (43,121) | (41,766) | (42,210) | (39,795) | (39,147) | (11,996)
Commercial | Owner occupied real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 521,186 |  | 496,306 |  |  |
Commercial | Non–owner occupied real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 1,016,377 |  | 999,636 |  |  |
Commercial | Residential spec homes |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 10,142 |  | 10,070 |  |  |
Commercial | Development & spec land |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 31,957 |  | 26,372 |  |  |
Commercial | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 593,538 |  | 659,887 |  |  |
Real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 773,449 |  | 1,019,912 |  |  |
Allowance for credit losses | (3,737) | (4,108) | (4,620) | (5,464) | (5,832) | (923)
Real estate | Residential mortgage |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 580,364 |  | 598,700 |  |  |
Real estate | Residential construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 23,176 |  | 25,586 |  |  |
Real estate | Mortgage warehouse |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 169,909 |  | 395,626 |  |  |
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 713,432 |  | 655,200 |  |  |
Allowance for credit losses | (8,867) | $ (8,620) | (8,930) | $ (9,810) | $ (8,921) | $ (3,671)
Consumer | Direct installment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 67,176 |  | 38,046 |  |  |
Consumer | Indirect installment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 365,756 |  | 357,511 |  |  |
Consumer | Home equity |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | $ 280,500 |  | $ 259,643 |  |  |

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