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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
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 changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=116846552&loc=d3e765-108305 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=116846552&loc=d3e725-108305 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794 + Details
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