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Loans and Allowance for Credit Losses - Schedule of Nonaccrual Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual Amortized Cost | $ 111,586 | $ 147,339
Nonaccrual With No Related Allowance | 30,373 | 25,618
Past Due 90 Days or More and Accruing | 113 | 167
Commercial |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual Amortized Cost | 26,534 | 34,895
Nonaccrual With No Related Allowance | 2,617 | 3,394
Past Due 90 Days or More and Accruing | 96 | 122
Commercial real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual Amortized Cost | 55,210 | 76,138
Nonaccrual With No Related Allowance | 27,756 | 22,152
Past Due 90 Days or More and Accruing | 0 | 20
BBCC |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual Amortized Cost | 3,621 | 3,551
Nonaccrual With No Related Allowance | 0 | 0
Past Due 90 Days or More and Accruing | 0 | 0
Residential real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual Amortized Cost | 18,943 | 24,794
Nonaccrual With No Related Allowance | 0 | 0
Past Due 90 Days or More and Accruing | 0 | 0
Indirect |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual Amortized Cost | 2,445 | 2,529
Nonaccrual With No Related Allowance | 0 | 0
Past Due 90 Days or More and Accruing | 0 | 12
Direct |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual Amortized Cost | 1,195 | 1,178
Nonaccrual With No Related Allowance | 0 | 27
Past Due 90 Days or More and Accruing | 17 | 13
Home equity |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual Amortized Cost | 3,638 | 4,254
Nonaccrual With No Related Allowance | 0 | 45
Past Due 90 Days or More and Accruing | $ 0 | $ 0

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