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Loans and Allowance for Credit Losses - Schedule of Nonaccrual Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual Amortized Cost | $ 142,138 | $ 147,339
Nonaccrual With No Related Allowance | 44,115 | 25,618
Past Due 90 Days or More and Accruing | 49 | 167
Commercial |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual Amortized Cost | 33,514 | 34,895
Nonaccrual With No Related Allowance | 1,890 | 3,394
Past Due 90 Days or More and Accruing | 49 | 122
Commercial real estate |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual Amortized Cost | 75,431 | 76,138
Nonaccrual With No Related Allowance | 42,221 | 22,152
Past Due 90 Days or More and Accruing | 0 | 20
BBCC |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual Amortized Cost | 3,151 | 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 | 20,935 | 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 | 2,786 | 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 | 1,264 | 1,178
Nonaccrual With No Related Allowance | 0 | 27
Past Due 90 Days or More and Accruing | 0 | 13
Home equity |  |
Financing Receivable, Nonaccrual [Line Items] |  |
Nonaccrual Amortized Cost | 5,057 | 4,254
Nonaccrual With No Related Allowance | 4 | 45
Past Due 90 Days or More and Accruing | $ 0 | $ 0

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