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Loans and Allowance for Credit Losses - Textual (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 credit | Dec. 31, 2021 USD ($) loan | Dec. 31, 2020 USD ($) loan credit
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans |  | $ 12,012,503,000 | $ 12,900,897,000
Premiums and discounts associated with acquired loans |  | 21,500,000 | 57,300,000
Financing receivable, accrued interest excluded from amortized costs |  | 39,800,000 | 54,400,000
Nonaccrual loans with no allowance for credit loss |  | $ 14,500,000 | $ 16,800,000
Number of loans | loan |  | 4 | 5
Balance Prior to TDR |  | $ 1,058,000 | $ 1,948,000
Number of previously restructured loans paid off | loan |  | 9 | 6
Restructured loans paid off |  | $ 1,002,874 | $ 837,265
Financial impact on date of restructure |  |  | 51,300
OREO secured by residential estate properties |  | 6,032,000 | 18,393,000
Financing receivable, collateral dependent, amount |  | 47,089,000 | 69,998,000
Number of energy credits | credit | 2 |  |
Unfunded commitments, allowance for credit loss |  | $ 22,400,000 | 22,400,000
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 |
COVID-19 Pandemic |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans |  | $ 116,700,000 | $ 904,700,000
Extended Maturity and Payment Deferral | COVID-19 Pandemic |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loans | loan |  | 51 | 3,729
Troubled debt, balance |  | $ 8,600,000 | $ 2,990,000,000
Residential Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans which formal proceedings in process |  | 1,806,000 | 7,182,000
Energy |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing receivable, collateral dependent, amount |  | 0 | 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 |  | 831,000 | 3,172,000
Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans |  | $ 9,167,250,000 | $ 9,223,791,000
Number of loans | loan |  | 4 | 5
Balance Prior to TDR |  | $ 1,058,000 | $ 1,948,000
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 | 0
Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans |  | 2,160,760,000 | $ 2,750,291,000
Number of energy credits | credit |  |  | 4
Single family residential | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans |  | $ 2,101,975,000 | $ 1,880,673,000
Number of loans | loan |  | 3 | 5
Balance Prior to TDR |  | $ 274,000 | $ 1,948,000
Allowance for credit losses on loans |  | 5,129 |
Financial impact on date of restructure |  | 0 | 0
Financing receivable, collateral dependent, amount |  | 1,838,000 | 6,950,000
Single family residential | Real Estate | Energy |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing receivable, collateral dependent, amount |  | 0 | 0
Other commercial | Real Estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans |  | $ 5,738,904,000 | $ 5,746,863,000
Number of loans | loan |  | 1 |
Balance Prior to TDR |  | $ 784,000 |
Financial impact on date of restructure |  | 0 |
Number of loans for which payment default | loan |  |  | 1
Charge-off of loans |  |  | $ 2,100,000
Financing receivable, collateral dependent, amount |  | 32,849,000 | 46,444,000
Other commercial | Real Estate | Energy |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing receivable, collateral dependent, amount |  | $ 0 | 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 |  | 17.00% |
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 |  | 18.00% |
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 |  | 65.00% |

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