Loans and Allowance for Credit Losses Summary Of Gross Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 21,076,569	$ 20,308,924
Unearned income	(31,884)	(29,377)
Net loans	21,044,685	20,279,547
Real estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	7,846,861	7,693,835
Net loans	7,846,861	7,693,835
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	4,602,446	4,477,537
Net loans	4,602,446	4,477,537
Real estate – residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	5,147,262	4,737,279
Net loans	5,147,262	4,737,279
Real estate - home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,061,891	1,102,838
Net loans	1,061,891	1,102,838
Real-estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,308,564	1,269,925
Net loans	1,308,564	1,269,925
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	763,530	699,179
Net loans	763,530	699,179
Leases and other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	346,015	328,331
Net loans	$ 314,131	$ 298,954