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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounting Policies [Abstract] |
Schedule of Error Corrections and Prior Period Adjustments | A summary of corrections is presented below.
Corrected Consolidated Statement of Cash Flows |  |
(unaudited) |  |  |  |  |
| Year Ended December 31, 2020
(in thousands) | As Reported |  | Adjustment |  | As Corrected
Investing Activities |  |  |  |  |
Proceeds from sales of investment securities available for sale | $ | 4,054,670 |  |  | $ | (1,404,984) |  |  | $ | 2,649,686 |
Purchases of investment securities available for sale | (7,441,163) |  |  | 1,404,984 |  |  | (6,036,179) |
Net cash used in investing activities | $ | 2,352,973 |  |  | $ | — |  |  | $ | 2,352,973 |
Accounting Standards Update and Change in Accounting Principle | The following table illustrates the impact of ASC 326 adoption:
| As of January 1, 2020
in thousands | Pre-ASC 326 Adoption |  | Impact of ASC 326 Adoption |  | As Reported under ASC 326
Assets |  |  |  |  |
Allowance for loan losses: |  |  |  |  |
Commercial and industrial | $ | 145,782 |  |  | $ | (2,310) |  |  | $ | 143,472 |
Commercial real estate | 67,430 |  |  | (651) |  |  | 66,779 |
Consumer | 68,190 |  |  | 85,955 |  |  | 154,145 |
Total allowance for loan losses | $ | 281,402 |  |  | $ | 82,994 |  |  | $ | 364,396 |
Liabilities |  |  |  |  |
Reserve for unfunded commitments | $ | 1,375 |  |  | $ | 27,440 |  |  | $ | 28,815 |
Allowance for credit losses | $ | 282,777 |  |  | $ | 110,434 |  |  | $ | 393,211 |
The following table illustrates the distribution of the ASC 326 adoption impact to loans and equity:
| As of January 1, 2020
in thousands | Pre-ASC 326 Adoption |  | Impact of ASC 326 Adoption |  | As Reported under ASC 326
Loans, net | $ | 36,881,048 |  |  | $ | (20,767) |  |  | $ | 36,860,281 |
Retained earnings | 1,068,327 |  |  | (35,721) |  |  | 1,032,606 |

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- Definition Tabular disclosure of prior period adjustments to previously issued financial statements including (1) the effect of the correction on each financial statement line item and any per-share amounts affected for each prior period presented (2) the cumulative effect of the change on retained earnings or other appropriate components of equity or net assets in the statement of financial position, as of the beginning of the earliest period presented, and (3) the effect of the prior period adjustments (both gross and net of applicable income tax) on the net income of each prior period presented in the entity's annual report for the year in which the adjustments are made. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22663-107794 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22644-107794 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=124431687&loc=d3e22658-107794 + Details
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