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Nature of Operations and Summary of Significant Accounting Policies - Schedule of CECL Adoption Impacts (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Assets: |  |  |  |
Held to maturity securities |  | $ 2,179,802 |  | $ 1,227,668
Loans |  | 9,241,861 |  | 9,243,174
Allowance for credit losses - loans | [1] | (195,397) |  | (130,648)
Net loans |  | 9,046,464 |  | 9,112,526
Tax asset, deferred and receivable |  | 35,641 |  | 12,340
Liabilities: |  |  |  |
Allowance for credit losses on unfunded loan commitments |  | 20,500 | $ 20,500 | 0
Stockholder's Equity: |  |  |  |
Retained earnings |  | 864,839 |  | 788,578
Impact of adopting ASC 326 |  |  |  |
Assets: |  |  |  |
Held to maturity securities |  |  | (245) |
Loans |  |  | 4,776 |
Allowance for credit losses - loans |  |  | (74,055) | (74,055)
Net loans |  |  | (69,279) |
Tax asset, deferred and receivable |  |  | 21,984 |
Liabilities: |  |  |  |
Allowance for credit losses on unfunded loan commitments |  | $ 20,500 | 20,500 |
Stockholder's Equity: |  |  |  |
Retained earnings |  |  | (68,040) |
Balances, January 1, 2021 Post-ASC 326 adoption |  |  |  |
Assets: |  |  |  |
Held to maturity securities |  |  | 1,227,423 |
Loans |  |  | 9,247,950 |
Allowance for credit losses - loans |  |  | (204,703) | $ (204,703)
Net loans |  |  | 9,043,247 |
Tax asset, deferred and receivable |  |  | 34,324 |
Liabilities: |  |  |  |
Allowance for credit losses on unfunded loan commitments |  |  | 20,500 |
Stockholder's Equity: |  |  |  |
Retained earnings |  |  | $ 720,538 |
[1] | Beginning January 1, 2021, the amount is based on the current expected credit loss methodology. Prior to January 1, 2021, the amount is based on the incurred loss methodology. See additional details in NOTE 1. NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES of these Notes to Consolidated Financial Statements.

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