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Loans and Allowance for Credit Losses - Textual (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 USD ($) loan | Jun. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) loan | Sep. 30, 2020 USD ($) loan | Sep. 30, 2019 USD ($) loan | Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | $ 14,017,442,000 |  |  | $ 14,017,442,000 |  | $ 14,425,704,000
Premiums and discounts associated with acquired loans |  |  |  | 69,900,000 |  | 91,600,000
Financing receivable, accrued interest excluded from amortized costs | 65,000,000.0 |  |  | 65,000,000.0 |  | 48,900,000
Nonaccrual loans with no allowance for credit loss | $ 17,800,000 |  |  | $ 17,800,000 |  |
Number of loans | loan | 5 |  | 1 | 5 | 1 |
Balance prior to TDR | $ 1,948,000 |  | $ 330,000 | $ 1,948,000 | $ 330,000 |
Allowance for credit losses on loans | 248,251,000 |  |  | 248,251,000 |  | 68,244,000
Foreclosed assets and other real estate owned | 12,590,000 |  |  | 12,590,000 |  | 19,121,000
Financing receivable, collateral dependent, amount | 71,727,000 |  |  | 71,727,000 |  |
Unfunded commitments, allowance for credit loss | 24,400,000 |  |  | 24,400,000 |  | 8,400,000
Off-balance sheet, credit loss, liability, credit loss expense (reversal) |  |  |  | $ (8,000,000.0) |  |
Extended Maturity and Payment Deferral | COVID-19 Pandemic |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Number of loans | loan |  |  |  | 3,956 |  |
Troubled debt, balance | 3,210,944,000 |  |  | $ 3,210,944,000 |  |
Deferred interest on troubled debt | 27,600,000 |  |  | $ 27,600,000 |  |
Number of trouble debt, previously modified, recovered | loan |  |  |  | 2,900 |  |
Troubled debt, previously modified, recovered | 1,900,000,000 |  |  | $ 1,900,000,000 |  |
Residential Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans in process of foreclosure, amount | 6,876,000 |  |  | 6,876,000 |  | 5,789,000
Energy |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivable, collateral dependent, amount | 19,100,000 |  |  | 19,100,000 |  |
OREO Received in Full or Partial Satisfaction of Loans | Residential Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Foreclosed assets and other real estate owned | 3,184,000 |  |  | 3,184,000 |  | 4,458,000
Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 9,983,253,000 |  |  | 9,983,253,000 |  | 11,021,940,000
Real Estate | OREO Received in Full or Partial Satisfaction of Loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Balance prior to TDR | 0 |  | $ 0 | 0 | $ 0 |
Single family residential | Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | $ 1,997,070,000 |  |  | $ 1,997,070,000 |  | 2,414,753,000
Number of loans | loan | 5 |  | 1 | 5 | 1 |
Balance prior to TDR | $ 1,948,000 |  | $ 330,000 | $ 1,948,000 | $ 330,000 |
Allowance for credit losses on loans | 16,600 |  |  | 16,600 |  |
Financing receivable, collateral dependent, amount | 6,722,000 |  |  | 6,722,000 |  |
Single family residential | Real Estate | Energy |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivable, collateral dependent, amount | 0 |  |  | $ 0 |  |
Commercial real estate | Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Number of loans with subsequent default | loan |  |  |  | 1 | 4 |
Write-down of impaired loans |  |  |  |  | $ 552,000 |
Other commercial | Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans | 6,132,823,000 |  |  | $ 6,132,823,000 |  | $ 6,358,514,000
Financing receivable, collateral dependent, amount | 40,358,000 |  |  | 40,358,000 |  |
Other commercial | Real Estate | Energy |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivable, collateral dependent, amount | $ 0 |  |  | $ 0 |  |
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 |  |  |  | 18.00% |  |
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 |  |  |  | 16.00% |  |
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 |  |  |  | 66.00% |  |

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