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Outstanding Commitments to Extend Credit and Letters of Credit (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Commercial and industrial |  |
Valuation allowances and reserves, balance | $ 5,245,041 | $ 3,997,401
Commerical mortgage and construction |  |
Valuation allowances and reserves, balance | 1,787,963 | 1,168,624
Real estate - home equity |  |
Valuation allowances and reserves, balance | 1,618,051 | 1,523,494
Total commitments to extend credit |  |
Valuation allowances and reserves, balance | 8,651,055 | 6,689,519
Standby letters of credit |  |
Valuation allowances and reserves, balance | 298,750 | 303,020
Commercial letters of credit |  |
Valuation allowances and reserves, balance | 56,229 | 50,432
Letter of Credit [Member] |  |
Valuation allowances and reserves, balance | $ 354,979 | $ 353,452

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- Definition The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
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