Loans and Allowance for Credit Losses Summary Of Gross Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$ 20,701,371	$ 20,308,924
Unearned income	(31,183)	(29,377)
Net loans	20,670,188	20,279,547
Real estate - commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	7,746,920	7,693,835
Net loans	7,746,920	7,693,835
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	4,600,696	4,477,537
Net loans	4,600,696	4,477,537
Commercial and Industrial \| PPP Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	9,800	20,400
Real estate – residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	4,880,919	4,737,279
Net loans	4,880,919	4,737,279
Real estate - home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,074,712	1,102,838
Net loans	1,074,712	1,102,838
Real-estate - construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	1,326,754	1,269,925
Net loans	1,326,754	1,269,925
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	730,775	699,179
Net loans	730,775	699,179
Leases and other loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	340,595	328,331
Net loans	$ 309,412	$ 298,954

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Amortized cost, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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