Loans and Allowance for Credit Losses Non-Performing Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual loans and leases	$ 123,280	$ 144,443
Loans and leases 90 days or more past due and still accruing	24,415	27,463
Total non-performing loans and leases	147,695	171,906
Other real estate owned (OREO)	3,881	5,790
Total non-performing assets	151,576	177,696
Total	21,044,685	20,279,547
Mortgage Loans in Process of Foreclosure, Amount	8,400	6,000
Financial Asset, Equal to or Greater than 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	24,415	27,463
US Government Insured Loan Program | Financial Asset, Equal to or Greater than 90 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 1,000	$ 7,700