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Loans - Summary of Portfolio Loans by Category (Details) - Portfolio loans, net - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | $ 7,241,500 | $ 7,241,074
Unearned loan fees, net | (15,233) | (16,139)
Loans, including unearned loan fees | 7,226,267 | 7,224,935
Commercial and industrial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 2,943,048 | 3,100,299
Loans, including unearned loan fees | 2,930,805 | 3,088,995
Commercial - investor owned |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 1,646,021 | 1,589,419
Loans, including unearned loan fees | 1,646,021 | 1,589,419
Commercial - owner occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 1,554,727 | 1,498,408
Loans, including unearned loan fees | 1,554,727 | 1,498,408
Construction and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 556,776 | 546,686
Loans, including unearned loan fees | 556,776 | 546,686
Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 305,497 | 319,179
Loans, including unearned loan fees | 305,497 | 319,179
Total real estate loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 4,063,021 | 3,953,692
Other |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, before unearned loan fees | 235,431 | 187,083
Loans, including unearned loan fees | $ 232,441 | $ 182,248

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