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Loans and Allowance for Credit Losses - Troubled Debt Restructurings, Excluding Loans Acquired, Segregated by Class of Loans (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 USD ($) loan | Sep. 30, 2019 loan | Sep. 30, 2020 USD ($) loan | Sep. 30, 2019 loan | Dec. 31, 2019 USD ($) loan
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans | 5 | 1 | 5 | 1 |
Extended Maturity and Payment Deferral | COVID-19 Pandemic |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 3,956 |  |
Troubled debt, balance | $ | $ 3,210,944 |  | $ 3,210,944 |  |
Extended Maturity and Payment Deferral | COVID-19 Pandemic | Real Estate Rental and Leasing |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 1,162 |  |
Troubled debt, balance | $ | 1,263,884 |  | $ 1,263,884 |  |
Extended Maturity and Payment Deferral | COVID-19 Pandemic | Accommodation and Food Services |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 386 |  |
Troubled debt, balance | $ | 845,803 |  | $ 845,803 |  |
Extended Maturity and Payment Deferral | COVID-19 Pandemic | Health Care and Social Assistance |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 226 |  |
Troubled debt, balance | $ | 278,200 |  | $ 278,200 |  |
Extended Maturity and Payment Deferral | COVID-19 Pandemic | Construction |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 186 |  |
Troubled debt, balance | $ | 190,337 |  | $ 190,337 |  |
Extended Maturity and Payment Deferral | COVID-19 Pandemic | Retail Trade |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 145 |  |
Troubled debt, balance | $ | 130,498 |  | $ 130,498 |  |
Extended Maturity and Payment Deferral | COVID-19 Pandemic | Other Services (Except Public Administration) |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 131 |  |
Troubled debt, balance | $ | 58,169 |  | $ 58,169 |  |
Extended Maturity and Payment Deferral | COVID-19 Pandemic | Other |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 1,720 |  |
Troubled debt, balance | $ | 444,053 |  | $ 444,053 |  |
Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 57 |  | 56
Troubled debt, balance | $ | 8,556 |  | $ 8,556 |  | $ 7,448
Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 35 |  | 30
Troubled debt, balance | $ | 3,379 |  | $ 3,379 |  | $ 5,887
Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 22 |  | 26
Troubled debt, balance | $ | 5,177 |  | $ 5,177 |  | $ 1,561
Real Estate | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 51 |  | 49
Troubled debt, balance | $ | 5,772 |  | $ 5,772 |  | $ 4,585
Real Estate | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 32 |  | 26
Troubled debt, balance | $ | 2,749 |  | $ 2,749 |  | $ 3,103
Real Estate | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 19 |  | 23
Troubled debt, balance | $ | $ 3,023 |  | $ 3,023 |  | $ 1,482
Real Estate | Construction and development | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  |  |  | 1
Troubled debt, balance | $ |  |  |  |  | $ 72
Real Estate | Construction and development | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  |  |  | 0
Troubled debt, balance | $ |  |  |  |  | $ 0
Real Estate | Construction and development | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  |  |  | 1
Troubled debt, balance | $ |  |  |  |  | $ 72
Real Estate | Single family residential |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans | 5 | 1 | 5 | 1 |
Real Estate | Single family residential | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 49 |  | 45
Troubled debt, balance | $ | $ 5,708 |  | $ 5,708 |  | $ 3,957
Real Estate | Single family residential | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 31 |  | 25
Troubled debt, balance | $ | 2,700 |  | $ 2,700 |  | $ 2,627
Real Estate | Single family residential | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 18 |  | 20
Troubled debt, balance | $ | 3,008 |  | $ 3,008 |  | $ 1,330
Real Estate | Other commercial | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 2 |  | 3
Troubled debt, balance | $ | 64 |  | $ 64 |  | $ 556
Real Estate | Other commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 1 |  | 1
Troubled debt, balance | $ | 49 |  | $ 49 |  | $ 476
Real Estate | Other commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 1 |  | 2
Troubled debt, balance | $ | 15 |  | $ 15 |  | $ 80
Commercial | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 6 |  | 7
Troubled debt, balance | $ | 2,784 |  | $ 2,784 |  | $ 2,863
Commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 3 |  | 4
Troubled debt, balance | $ | 630 |  | $ 630 |  | $ 2,784
Commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 3 |  | 3
Troubled debt, balance | $ | 2,154 |  | $ 2,154 |  | $ 79
Commercial | Commercial | Loans, Excluding Acquired Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 6 |  | 7
Troubled debt, balance | $ | 2,784 |  | $ 2,784 |  | $ 2,863
Commercial | Commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 3 |  | 4
Troubled debt, balance | $ | 630 |  | $ 630 |  | $ 2,784
Commercial | Commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans |  |  | 3 |  | 3
Troubled debt, balance | $ | $ 2,154 |  | $ 2,154 |  | $ 79

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