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Loans and Allowance for Credit Losses - Troubled Debt Restructurings, Excluding Loans Acquired, Segregated by Class of Loans (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 5 | 4
Extended Maturity and Payment Deferral | COVID-19 Pandemic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 3,729 |
Troubled debt, balance | $ | $ 2,990,845 |
Real Estate Rental and Leasing | Extended Maturity and Payment Deferral | COVID-19 Pandemic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 1,038 |
Troubled debt, balance | $ | $ 1,160,537 |
Accommodation and Food Services | Extended Maturity and Payment Deferral | COVID-19 Pandemic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 374 |
Troubled debt, balance | $ | $ 859,006 |
Health Care and Social Assistance | Extended Maturity and Payment Deferral | COVID-19 Pandemic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 206 |
Troubled debt, balance | $ | $ 285,690 |
Construction | Extended Maturity and Payment Deferral | COVID-19 Pandemic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 164 |
Troubled debt, balance | $ | $ 118,964 |
Retail Trade | Extended Maturity and Payment Deferral | COVID-19 Pandemic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 143 |
Troubled debt, balance | $ | $ 131,311 |
Other Services (Except Public Administration) | Extended Maturity and Payment Deferral | COVID-19 Pandemic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 128 |
Troubled debt, balance | $ | $ 56,283 |
Other | Extended Maturity and Payment Deferral | COVID-19 Pandemic |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 1,676 |
Troubled debt, balance | $ | $ 379,054 |
Loans, Excluding Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 54 | 56
Troubled debt, balance | $ | $ 7,513 | $ 7,448
Loans, Excluding Acquired Loans | Accruing TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 32 | 30
Troubled debt, balance | $ | $ 3,138 | $ 5,887
Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 22 | 26
Troubled debt, balance | $ | $ 4,375 | $ 1,561
Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 5 | 4
Real Estate | Loans, Excluding Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 48 | 49
Troubled debt, balance | $ | $ 5,260 | $ 4,585
Real Estate | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 29 | 26
Troubled debt, balance | $ | $ 2,512 | $ 3,103
Real Estate | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 19 | 23
Troubled debt, balance | $ | $ 2,748 | $ 1,482
Real Estate | Construction and development | Loans, Excluding Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans |  | 1
Troubled debt, balance | $ |  | $ 72
Real Estate | Construction and development | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans |  | 0
Troubled debt, balance | $ |  | $ 0
Real Estate | Construction and development | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans |  | 1
Troubled debt, balance | $ |  | $ 72
Real Estate | Single family residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 5 | 4
Real Estate | Single family residential | Loans, Excluding Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 46 | 45
Troubled debt, balance | $ | $ 5,199 | $ 3,957
Real Estate | Single family residential | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 28 | 25
Troubled debt, balance | $ | $ 2,463 | $ 2,627
Real Estate | Single family residential | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 18 | 20
Troubled debt, balance | $ | $ 2,736 | $ 1,330
Real Estate | Other commercial | Loans, Excluding Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 2 | 3
Troubled debt, balance | $ | $ 61 | $ 556
Real Estate | Other commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 1 | 1
Troubled debt, balance | $ | $ 49 | $ 476
Real Estate | Other commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 1 | 2
Troubled debt, balance | $ | $ 12 | $ 80
Commercial | Loans, Excluding Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 6 | 7
Troubled debt, balance | $ | $ 2,253 | $ 2,863
Commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 3 | 4
Troubled debt, balance | $ | $ 626 | $ 2,784
Commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 3 | 3
Troubled debt, balance | $ | $ 1,627 | $ 79
Commercial | Commercial | Loans, Excluding Acquired Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 6 | 7
Troubled debt, balance | $ | $ 2,253 | $ 2,863
Commercial | Commercial | Loans, Excluding Acquired Loans | Accruing TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 3 | 4
Troubled debt, balance | $ | $ 626 | $ 2,784
Commercial | Commercial | Loans, Excluding Acquired Loans | Nonaccrual TDR Loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Number of TDR loans | 3 | 3
Troubled debt, balance | $ | $ 1,627 | $ 79

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