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General - Schedule of Changes in Accounting Principles (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Jan. 01, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | --- | ---
Assets: |  |  |  |  |  |  |  |  |
Held to maturity securities | $ 2,070,938 |  |  |  | $ 1,227,668 |  |  |  |
Loans | 9,041,576 |  |  |  | 9,243,174 |  |  |  |
Allowance for credit losses - loans | (199,972) | [1] | $ (199,775) |  | (130,648) | [1] | $ (126,726) | $ (121,119) | $ (80,284)
Net loans | 8,841,604 |  |  |  | 9,112,526 |  |  |  |
Tax asset, deferred and receivable | 39,504 |  |  |  | 12,340 |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Allowance for credit losses on unfunded loan commitments | 20,500 |  | $ 20,500 |  | 0 |  |  |  |
Stockholder's Equity: |  |  |  |  |  |  |  |  |
Retained Earnings | 832,728 |  |  |  | 788,578 |  |  |  |
Impact of CECL Adoption |  |  |  |  |  |  |  |  |
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) |  |  |  |  |
January 1, 2021 Post-CECL 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. GENERAL of these Notes to Consolidated Condensed Financial Statement.

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