Loans - Financing Receivables, Modified Loans Past Due in Excess of 90 Days or on Non-Accrual Status at Period-End (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025	Sep. 30, 2025
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans, net of unearned discounts	$ 23,656,967	$ 21,891,812
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans, net of unearned discounts	134,646
Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans, net of unearned discounts	54,939		$ 4,008
Payment Deferral | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans, net of unearned discounts	54,939		5,058
Commercial Portfolio Segment [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans, net of unearned discounts	6,467,069	6,306,980
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans, net of unearned discounts	25,569
Commercial Portfolio Segment [Member] | Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans, net of unearned discounts			2,236
Commercial Portfolio Segment [Member] | Payment Deferral | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans, net of unearned discounts	0		3,286
Commercial Portfolio Segment [Member] | Payment Deferral | Charge-offs
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans, net of unearned discounts	0		1,108
Commercial Real Estate Owner Occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans, net of unearned discounts	4,402,147	3,987,913
Commercial Real Estate Owner Occupied | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans, net of unearned discounts	17,012
Commercial Real Estate Owner Occupied | Payment Deferral | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans, net of unearned discounts	0		0
Commercial Real Estate Non-Owner Occupied
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans, net of unearned discounts	4,218,556	3,773,028
Commercial Real Estate Non-Owner Occupied | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans, net of unearned discounts	59,439
Commercial Real Estate Non-Owner Occupied | Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans, net of unearned discounts	54,939
Commercial Real Estate Non-Owner Occupied | Payment Deferral | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans, net of unearned discounts	54,939		0
Construction Loans [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans, net of unearned discounts	2,757,013	$ 2,549,869
Construction Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans, net of unearned discounts	17,874
Construction Loans [Member] | Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans, net of unearned discounts			1,772
Construction Loans [Member] | Payment Deferral | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans, net of unearned discounts	$ 0		$ 1,772