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Loans and Allowance for Credit Losses, Loans by Portfolio Type (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	$ 6,297,003	$ 6,603,265
Loans, variable rate of interest	15,362,654	13,468,356
Loans, non-accrual	130,800	134,059
Total	21,790,457	20,205,680
Credit Commitments [Abstract]
Outstanding commitments to extend credit	14,600,000
Outstanding standby letters of credit	725,000
Commercial [Member]
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	3,333,460	3,360,117
Loans, variable rate of interest	10,198,556	9,072,244
Loans, non-accrual	75,670	74,104
Total	13,607,686	12,506,465
Commercial real estate [Member]
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	888,066	929,015
Loans, variable rate of interest	3,577,874	2,888,048
Loans, non-accrual	7,971	14,262
Total	4,473,911	3,831,325
Paycheck Protection Program [Member]
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	20,233	276,341
Loans, variable rate of interest	0	0
Loans, non-accrual	0	0
Total	20,233	276,341
Loans to individuals [Member]
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	2,055,244	2,037,792
Loans, variable rate of interest	1,586,224	1,508,064
Loans, non-accrual	47,159	45,693
Total	$ 3,688,627	$ 3,591,549

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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 https://asc.fasb.org/extlink&oid=124259787&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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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
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Amount of loan with fixed rate of interest.

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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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