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Loans - Loans Outstanding by Portfolio Class (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)
Loans (excluding loan level hedges), net | 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)
Owner occupied real estate | Commercial |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loan Balance | 503,127 |  |  | 519,577 |  |  |
Non–owner occupied real estate | Commercial |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loan Balance | 1,019,171 |  |  | 973,331 |  |  |
Residential spec homes | Commercial |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loan Balance | 11,190 |  |  |  |  |  |
Development & spec land | Commercial |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loan Balance | 26,385 |  |  | 35,954 |  |  |
Commercial and industrial | Commercial |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loan Balance | 761,735 |  |  | 505,859 |  |  |
Residential mortgage | Real estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loan Balance | 651,680 |  |  | 751,019 |  |  |
Residential construction | Real estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loan Balance | 23,540 |  |  | 19,686 |  |  |
Mortgage warehouse | Real estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loan Balance | 374,653 |  |  | 150,293 |  |  |
Direct installment | Consumer |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loan Balance | 39,049 |  |  | 41,079 |  |  |
Indirect installment | Consumer |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loan Balance | 359,299 |  |  | 348,658 |  |  |
Home equity | Consumer |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loan Balance | $ 260,536 |  |  | $ 276,215 |  |  |

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