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Loans and Allowance for Credit Losses, Loans by Portfolio Type (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	$ 7,561,204	$ 8,078,873
Loans, variable rate of interest	13,675,609	14,693,954
Loans, non-accrual	179,636	234,693
Total	21,416,449	23,007,520
Credit Commitments [Abstract]
Outstanding commitments to extend credit	11,500,000
Outstanding standby letters of credit	672,000
Commercial [Member]
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	3,277,687	3,174,203
Loans, variable rate of interest	9,082,616	9,736,173
Loans, non-accrual	112,604	167,159
Total	12,472,907	13,077,535
Commercial real estate [Member]
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	1,028,432	1,047,486
Loans, variable rate of interest	3,192,437	3,623,806
Loans, non-accrual	26,123	27,246
Total	4,246,992	4,698,538
Paycheck Protection Program [Member]
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	1,121,583	1,682,310
Loans, variable rate of interest	0	0
Loans, non-accrual	0	0
Total	1,121,583	1,682,310
Loans to individuals [Member]
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	2,133,502	2,174,874
Loans, variable rate of interest	1,400,556	1,333,975
Loans, non-accrual	40,909	40,288
Total	$ 3,574,967	$ 3,549,137

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

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Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
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Amount of loan with fixed rate of interest.

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-Topic 310
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Amount of loan with variable or adjustable rate of interest.

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Unused amount of commitments to extend credit to customers.

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