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Recent Accounting and Regulatory Pronouncements - Impact of ASU (Details) - USD ($) $ in Thousands | Jan. 01, 2020 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | --- | ---
Assets: |  |  |  |  |  |  |  |
Investment Securities - Available for Sale |  |  | $ 4,631,554 |  | $ 3,330,672 |  |  |
Investment Securities - Held to Maturity |  |  | 1,641,485 |  | 955,542 |  |  |
Allowance for Credit Losses on Loans |  |  | (314,144) | $ (350,401) | (457,309) | $ (440,159) | $ (434,608) | $ (56,927)
Deferred Tax Asset |  |  | 19,684 |  | 110,946 |  |  |
Accrued Interest Receivable - Loans |  |  | 76,300 |  | 93,900 |  |  |
Liabilities: |  |  |  |  |  |  |  |
Reserve for Loan Losses - Unfunded Commitments |  |  | 314,144 |  | 457,309 |  |  |
Equity: |  |  |  |  |  |  |  |
Retained Earnings |  |  | 925,044 |  | 657,451 |  |  |
Credit Discount on Acquired Credit Impaired Loans |  | $ 3,408 |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  | 314,144 | $ 350,401 | 457,309 | 440,159 | 434,608 | 56,927
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent |  | 22.00% |  |  |  |  |  |
Non-acquired loans |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Allowance for Credit Losses on Loans |  | $ (34,049) |  |  |  |  |  |
Equity: |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  | 34,049 |  |  |  |  |  |
Acquired loans |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Allowance for Credit Losses on Loans |  | (16,981) |  |  |  |  |  |
Equity: |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  | 16,981 |  |  |  |  |  |
Purchased Credit Deteriorated Loans |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Allowance for Credit Losses on Loans |  | (3,408) |  |  |  |  |  |
Equity: |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  | 3,408 |  |  |  |  |  |
ASU 2016-13 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Acquired Loans | [1] | 1,723 |  |  |  |  |  |
Allowance for Credit Losses on Loans | [2] | (54,438) |  |  |  |  |  |
Deferred Tax Asset | [3] | 12,639 |  |  |  |  |  |
Accrued Interest Receivable - Loans | [1] | 1,677 |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |
Reserve for Loan Losses - Unfunded Commitments | [4] | 6,421 |  |  |  |  |  |
Equity: |  |  |  |  |  |  |  |
Retained Earnings | [5] | (44,820) |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses | [2] | 54,438 |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Accrued Interest Receivable - Loans |  |  | $ 76,300 |  | $ 93,900 |  |  |
Other Assets | ASU 2016-13 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Accrued Interest Receivable - Loans |  | 1,677 |  |  |  |  |  |
As previously recorded by acquiree | ASU 2016-13 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Investment Securities - Available for Sale |  | 1,956,047 |  |  |  |  |  |
Non - Acquired Loans |  | 9,252,831 |  |  |  |  |  |
Acquired Loans |  | 2,118,940 |  |  |  |  |  |
Allowance for Credit Losses on Loans |  | (111,365) |  |  |  |  |  |
Deferred Tax Asset |  | 43,955 |  |  |  |  |  |
Accrued Interest Receivable - Loans |  | 30,009 |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |
Reserve for Loan Losses - Unfunded Commitments |  | 6,756 |  |  |  |  |  |
Equity: |  |  |  |  |  |  |  |
Retained Earnings |  | 635,075 |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  | 111,365 |  |  |  |  |  |
Adjustments |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Allowance for Credit Losses on Loans |  |  |  |  |  |  | (433,066) | (111,365)
Equity: |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |  |  |  |  | 433,066 | 111,365
Adjustments | ASU 2016-13 |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |
Investment Securities - Available for Sale |  | 1,956,047 |  |  |  |  |  |
Non - Acquired Loans |  | 9,252,831 |  |  |  |  |  |
Acquired Loans |  | 2,117,209 |  |  |  |  |  |
Allowance for Credit Losses on Loans |  | (56,927) |  |  |  | (109,442) | 1,542 | (51,030)
Deferred Tax Asset |  | 31,316 |  |  |  |  |  |
Accrued Interest Receivable - Loans |  | 28,332 |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |
Reserve for Loan Losses - Unfunded Commitments |  | 335 |  |  |  |  |  |
Equity: |  |  |  |  |  |  |  |
Retained Earnings |  | 679,895 |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses |  | $ 56,927 |  |  |  | $ 109,442 | $ (1,542) | $ 51,030
[1] | Accrued interest receivable from acquired credit impaired loans of $1,677 was reclassified to other assets and was offset by the reclassification of the grossed up credit discount on acquired credit impaired loans of $3,408 that was moved to the ACL for the purchased credit deteriorated loans.
[2] | This is the calculated adjustment to the ACL related to the adoption of ASC 326. Additional reserve related to non-acquired loans was $34,049, to acquired loans was $16,981 and to purchased credit deteriorated loans was $3,408.
[3] | This is the effect of deferred tax assets related to the adjustment to the ACL from the adoption of ASC 326 using a 22% tax rate.
[4] | This is the adjustment to the reserve for unfunded commitments related to the adoption of ASC 326.
[5] | This is the net adjustment to retained earnings related to the adoption of ASC 326.

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