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Loans and Allowance for Credit Losses - Textual (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) loan | Mar. 31, 2021 USD ($) loan | Jun. 30, 2020 USD ($) loan credit | Jun. 30, 2021 USD ($) loan | Jun. 30, 2020 USD ($) loan | Dec. 31, 2020 USD ($) loan | Mar. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | $ 11,386,352,000 |  |  | $ 11,386,352,000 |  | $ 12,900,897,000 |
Premiums and discounts associated with acquired loans |  |  |  | 43,700,000 |  | 57,300,000 |
Financing receivable, accrued interest excluded from amortized costs | 41,900,000 |  |  | 41,900,000 |  | 54,400,000 |
Nonaccrual loans with no allowance for credit loss | $ 15,700,000 |  |  | $ 15,700,000 |  | 16,800,000 |
Number of loan modifications | loan | 1 |  | 1 | 1 | 1 |  |
Balance prior to TDR | $ 784,000 |  | $ 147,000 | $ 784,000 | $ 147,000 |  |
Foreclosed assets and other real estate owned | 15,239,000 |  |  | 15,239,000 |  | 18,393,000 |
Financing receivable, collateral dependent, amount | 74,815,000 |  |  | 74,815,000 |  |  |
Number of energy credits | credit |  |  | 4 |  |  |  |
Unfunded commitments, allowance for credit loss | 22,400,000 |  |  | 22,400,000 |  | $ 22,400,000 |
Off-balance sheet, credit loss, liability, credit loss expense (reversal) | 0 |  | $ (5,000,000.0) | 0 | $ (8,000,000.0) |  |
Extended Maturity and Payment Deferral | COVID-19 Pandemic |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Number of loan modifications | loan |  | 43 |  |  |  | 43 |
Troubled debt, balance |  | $ 134,500,000 |  |  |  | $ 134,500,000 |
Residential Real Estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans in process of foreclosure, amount | 3,364,000 |  |  | 3,364,000 |  | 7,182,000 |
Energy |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Financing receivable, collateral dependent, amount | 30,677,000 |  |  | 30,677,000 |  |  |
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 | 1,752,000 |  |  | 1,752,000 |  | 3,172,000 |
Real Estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | $ 8,368,848,000 |  |  | $ 8,368,848,000 |  | 9,223,791,000 |
Number of loan modifications | loan | 1 |  | 1 | 1 | 1 |  |
Balance prior to TDR | $ 784,000 |  | $ 147,000 | $ 784,000 | $ 147,000 |  |
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 |  |
Single family residential | Real Estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | 1,608,028,000 |  |  | 1,608,028,000 |  | 1,880,673,000 |
Number of loan modifications | 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 | 2,940,000 |  |  | 2,940,000 |  |  |
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 | 0 |  |
Other commercial | Real Estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | $ 5,332,655,000 |  |  | $ 5,332,655,000 |  | 5,746,863,000 |
Number of loan modifications | loan | 1 |  |  | 1 |  |  |
Balance prior to TDR | $ 784,000 |  |  | $ 784,000 |  |  |
Allowance for credit losses on loans | 5,100 |  |  | 5,100 |  |  |
Financing receivable, collateral dependent, amount | 34,431,000 |  |  | 34,431,000 |  |  |
Other commercial | Real Estate | Energy |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Allowance for credit losses on loans |  |  |  |  |  |  | $ 27,100,000
Financing receivable, collateral dependent, amount | 0 |  |  | 0 |  |  |
Charge-offs |  |  | $ 32,600,000 |  |  |  |
Paycheck Protection Program Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | $ 441,400,000 |  |  | $ 441,400,000 |  | $ 904,700,000 |

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