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Loans and Allowance for Credit Losses - Schedule of Nonaccrual Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
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Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual Amortized Cost | $ 147,339 | $ 137,611 | $ 132,431 | $ 126,412
Nonaccrual With No Related Allowance | 25,618 |  |  |
Past Due 90 Days or More and Accruing | 167 |  |  |
Commercial |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual Amortized Cost | 34,895 | 34,188 | 40,103 | 39,036
Nonaccrual With No Related Allowance | 3,394 |  |  |
Past Due 90 Days or More and Accruing | 122 |  |  |
Commercial real estate |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual Amortized Cost | 76,138 | 67,859 | 58,350 |
Nonaccrual With No Related Allowance | 22,152 |  |  |
Past Due 90 Days or More and Accruing | 20 |  |  |
BBCC |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual Amortized Cost | 3,551 | 3,601 | 4,530 |
Nonaccrual With No Related Allowance | 0 |  |  |
Past Due 90 Days or More and Accruing | 0 |  |  |
Residential real estate |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual Amortized Cost | 24,794 | 23,914 | 20,970 | $ 21,023
Nonaccrual With No Related Allowance | 0 |  |  |
Past Due 90 Days or More and Accruing | 0 |  |  |
Indirect |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual Amortized Cost | 2,529 | 2,619 | 3,318 |
Nonaccrual With No Related Allowance | 0 |  |  |
Past Due 90 Days or More and Accruing | 12 |  |  |
Direct |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual Amortized Cost | 1,178 | 1,264 | 1,303 |
Nonaccrual With No Related Allowance | 27 |  |  |
Past Due 90 Days or More and Accruing | 13 |  |  |
Home equity |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual Amortized Cost | 4,254 | $ 4,166 | $ 3,857 |
Nonaccrual With No Related Allowance | 45 |  |  |
Past Due 90 Days or More and Accruing | $ 0 |  |  |

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