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Loans and Allowance for Credit Losses - Textual (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  | $ 12,900,897,000 | $ 14,425,704,000
Premiums and discounts associated with acquired loans |  | 57,300,000 | 91,600,000
Financing receivable, accrued interest excluded from amortized costs |  | 54,400,000 | $ 48,900,000
Nonaccrual loans with no allowance for credit loss |  | $ 16,800,000 |
Number of loans | loan |  | 5 | 4
Balance Prior to TDR |  | $ 1,948,000 | $ 997,000
Allowance for credit losses on loans |  | $ 238,050,000 | $ 68,244,000
Number of previously restructured loans paid off | loan |  | 6 | 3
Restructured loans paid off |  | $ 837,265 | $ 81,600
Financial impact on date of restructure |  |  | 0
OREO secured by residential estate properties |  | 18,393,000 | 19,121,000
Financing receivable, collateral dependent, amount |  | 69,998,000 |
Unfunded commitments, allowance for credit loss |  | 22,400,000 | 8,400,000
Off-balance sheet, credit loss, liability, credit loss expense (reversal) |  | (10,000,000.0) |
COVID-19 Pandemic |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  | $ 904,700,000 |
Number of PPP loans | loan |  | 8,208 |
Outstanding balance of PPP loans |  | $ 975,600,000 |
Extended Maturity and Payment Deferral | COVID-19 Pandemic |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loans | loan |  | 3,729 |
Troubled debt, balance |  | $ 2,990,845,000 |
Deferred interest on troubled debt |  | $ 20,200,000 |
Number of troubled debt, previously modified, recovered | loan |  | 3,600 |
Troubled debt, previously modified, recovered |  | $ 2,900,000,000 |
Residential Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans which formal proceedings in process |  | 7,182,000 | 5,789,000
Energy |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing receivable, collateral dependent, amount |  | 40,703,000 |
OREO Received in Full or Partial Satisfaction of Loans | Residential Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
OREO secured by residential estate properties |  | 3,172,000 | 4,458,000
Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  | $ 9,223,791,000 | $ 10,884,524,000
Number of loans | loan |  | 5 | 4
Balance Prior to TDR |  | $ 1,948,000 | $ 997,000
Financial impact on date of restructure |  | 0 | 0
Real Estate | OREO Received in Full or Partial Satisfaction of Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance Prior to TDR |  | 0 |
Single family residential | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  | $ 1,880,673,000 | $ 2,442,064,000
Number of loans | loan |  | 5 | 4
Balance Prior to TDR |  | $ 1,948,000 | $ 997,000
Allowance for credit losses on loans |  | 51,300 |
Financial impact on date of restructure |  | 0 | 0
Financing receivable, collateral dependent, amount |  | 6,950,000 |
Single family residential | Real Estate | Energy |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing receivable, collateral dependent, amount |  | $ 0 |
Commercial real estate | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Balance Prior to TDR |  |  | 2,100,000
Number of loans for which payment default | loan |  | 1 |
Charge-off of loans |  |  | 552,000
Other commercial | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans |  | $ 5,746,863,000 | 6,205,599,000
Balance Prior to TDR |  |  | $ 690,000
Number of loans for which payment default | loan |  |  | 4
Financing receivable, collateral dependent, amount |  | 46,444,000 |
Other commercial | Real Estate | Energy |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing receivable, collateral dependent, amount |  | $ 40,703,000 |
Charge-offs | $ 32,600,000 |  |
Other commercial | Real Estate | Energy | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Moody's, S-2 Rating |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Baseline economic forecast percentage |  | 15.00% |
Other commercial | Real Estate | Energy | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Moody's, S-3 Rating |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Baseline economic forecast percentage |  | 17.00% |
Other commercial | Real Estate | Energy | Financial Asset, Other than Financial Asset Acquired with Credit Deterioration | Internal Investment Grade |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Baseline economic forecast percentage |  | 68.00% |

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