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Loans and Allowance for Credit Losses - Textual (Details) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) loan | Sep. 30, 2021 USD ($) loan | Sep. 30, 2020 USD ($) loan | Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans | $ 10,825,227,000 |  | $ 10,825,227,000 |  | $ 12,900,897,000
Premiums and discounts associated with acquired loans |  |  | 29,400,000 |  | 57,300,000
Financing receivable, accrued interest excluded from amortized costs | 39,200,000 |  | 39,200,000 |  | 54,400,000
Nonaccrual loans with no allowance for credit loss | 20,200,000 |  | $ 20,200,000 |  | 16,800,000
Number of loan modifications | loan |  |  | 1 | 5 |
Balance prior to TDR |  |  | $ 784,000 | $ 1,900,000 |
Foreclosed assets and other real estate owned | 11,759,000 |  | 11,759,000 |  | 18,393,000
Financing receivable, collateral dependent, amount | 42,091,000 |  | 42,091,000 |  |
Number of energy credits | loan |  | 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 |  | $ 0 | $ (8,000,000) |
Minimum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, term of loan |  |  | 1 year |  |
Maximum |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, term of loan |  |  | 3 years |  |
Extended Maturity and Payment Deferral | COVID-19 Pandemic |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Number of loan modifications | loan |  |  | 35 |  |
Troubled debt, balance | 82,000,000 |  | $ 82,000,000 |  |
Residential Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans in process of foreclosure, amount | 2,900,000 |  | 2,900,000 |  | 7,200,000
Energy |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing receivable, collateral dependent, amount | 0 |  | 0 |  |
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 | 1,600,000 |  | 1,600,000 |  | 3,200,000
Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans | 8,079,343,000 |  | $ 8,079,343,000 |  | 9,223,791,000
Number of loan modifications | loan |  |  | 1 | 5 |
Balance prior to TDR |  |  | $ 784,000 | $ 1,948,000 |
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 | 1,540,701,000 |  | 1,540,701,000 |  | 1,880,673,000
Number of loan modifications | loan |  |  |  | 5 |
Balance prior to TDR |  |  |  | $ 1,948,000 |
Allowance for credit losses on loans |  |  |  | $ 16,600 |
Financing receivable, collateral dependent, amount | 2,921,000 |  | 2,921,000 |  |
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 | 5,308,902,000 |  | $ 5,308,902,000 |  | 5,746,863,000
Number of loan modifications | loan |  |  | 1 |  |
Balance prior to TDR |  |  | $ 784,000 |  |
Allowance for credit losses on loans | 5,100 |  | 5,100 |  |
Financing receivable, collateral dependent, amount | 31,672,000 |  | 31,672,000 |  |
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 |  |  |
Paycheck Protection Program Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans | $ 212,100,000 |  | $ 212,100,000 |  | $ 904,700,000

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