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Loans and Allowance for Credit Losses - Textual (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) loan | Jun. 30, 2019 USD ($) loan | Jun. 30, 2020 USD ($) loan | Jun. 30, 2019 USD ($) loan | Dec. 31, 2019 USD ($) | Mar. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 14,606,900,000 |  | $ 14,606,900,000 |  | $ 14,425,704,000 |
Premiums and discounts associated with acquired loans |  |  | 82,200,000 |  | 91,600,000 |
Financing receivable, accrued interest excluded from amortized costs | 66,900,000 |  | 66,900,000 |  | 48,900,000 |
Nonaccrual loans with no allowance for credit loss | $ 18,000,000.0 |  | $ 18,000,000.0 |  |  |
Number of loans | loan | 1 | 0 | 1 | 0 |  |
Balance prior to TDR | $ 147,000 |  | $ 147,000 |  |  |
Allowance for credit losses on loans | 231,643,000 |  | 231,643,000 |  | 68,244,000 |
Foreclosed assets and other real estate owned | 14,111,000 |  | 14,111,000 |  | 19,121,000 |
Financing receivable, collateral dependent, amount | 55,049,000 |  | 55,049,000 |  |  |
Unfunded commitments, allowance for credit loss | 24,400,000 |  | 24,400,000 |  | 8,400,000 |
(Benefit) provision for credit losses on unfunded commitments |  |  | (8,000,000) | $ 950,000 |  |
Residential Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans in process of foreclosure, amount | 4,395,000 |  | 4,395,000 |  | 5,789,000 |
Energy |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivable, collateral dependent, amount | 21,755,000 |  | 21,755,000 |  |  |
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 | 2,321,000 |  | 2,321,000 |  | 4,458,000 |
Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 10,533,787,000 |  | 10,533,787,000 |  | 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] |  |  |  |  |  |
Loans | $ 2,207,087,000 |  | $ 2,207,087,000 |  | 2,414,753,000 |
Number of loans | loan | 1 |  | 1 |  |  |
Balance prior to TDR | $ 147,000 |  | $ 147,000 |  |  |
Allowance for credit losses on loans | 7,200 |  | 7,200 |  |  |
Financing receivable, collateral dependent, amount | 5,479,000 |  | 5,479,000 |  |  |
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 |  |  | 0 | 1 |  |
Write-down of impaired loans |  |  |  | $ 138,000 |  |
Other commercial | Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | 6,316,444,000 |  | $ 6,316,444,000 |  | $ 6,358,514,000 |
Financing receivable, collateral dependent, amount | 18,654,000 |  | 18,654,000 |  |  |
Other commercial | Real Estate | Energy |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Financing receivable, collateral dependent, amount | $ 0 |  | $ 0 |  |  |
Number of energy credits charged off | loan | 4 |  |  |  |  |
Charge-offs | $ 32,600,000 |  |  |  |  |
Impaired loan, related allowance |  |  |  |  |  | $ 27,100,000
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 |  |  | 22.00% |  |  |
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 |  |  | 10.00% |  |  |
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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