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Commitments and Contingencies (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Standby Letters of Credit |  |
Guarantor Obligations [Line Items] |  |
Standby letters of credit | $ 116,302 | $ 129,819
Qualified Affordable Housing Project investments | 162,300 | 163,900
Commitments to Extend Credit |  |
Guarantor Obligations [Line Items] |  |
Unused Commitments to Extend Credit | 12,775,929 | 12,098,417
Qualified Affordable Housing Project, Unfunded Commitments | $ 49,800 | $ 53,700

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- Definition Amount of investment in qualified affordable housing projects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985 + Details
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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121555522&loc=d3e12069-110248 + Details
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- Definition Amount of commitment or contingent commitments to qualified affordable housing project investments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985 + Details
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- Definition Unused amount of commitments to extend credit to customers. + References No definition available. + Details
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