Loans and Leases - Aging Analysis of Accruing and Nonaccrual Modified Loans to Borrowers Experiencing Financial Difficult (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	$ 6,833,037	$ 6,826,583	$ 6,579,086
Accrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	24,988		8,009
Nonaccrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0		5,739
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	6,796,421	6,796,866
Current | Accrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	24,988		8,009
Current | Nonaccrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0		0
Financial Asset, 30 to 89 Days Past Due | Accrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0		0
Financial Asset, 30 to 89 Days Past Due | Nonaccrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0		0
90 Days or more Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	322	321
90 Days or more Past Due | Accrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0		0
90 Days or more Past Due | Nonaccrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0		5,739
Commercial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	1,034,361	1,037,835	1,014,568
Commercial, financial and agricultural | Accrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	15,238
Commercial, financial and agricultural | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	1,026,208	1,031,567
Commercial, financial and agricultural | Current | Accrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	15,238
Commercial, financial and agricultural | Financial Asset, 30 to 89 Days Past Due | Accrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0
Commercial, financial and agricultural | 90 Days or more Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0	0
Commercial, financial and agricultural | 90 Days or more Past Due | Accrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0
Real estate-commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	3,546,402	3,530,451	3,283,729
Real estate-commercial | Accrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	5,024		6,178
Real estate-commercial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	3,531,452	3,524,438
Real estate-commercial | Current | Accrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	5,024		6,178
Real estate-commercial | Financial Asset, 30 to 89 Days Past Due | Accrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0		0
Real estate-commercial | 90 Days or more Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0	0
Real estate-commercial | 90 Days or more Past Due | Accrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0		0
Real estate-construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	281,785	274,483	379,995
Real estate-construction | Accrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	4,726		1,831
Real estate-construction | Nonaccrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross			5,739
Real estate-construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	281,070	270,824
Real estate-construction | Current | Accrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	4,726		1,831
Real estate-construction | Current | Nonaccrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross			0
Real estate-construction | Financial Asset, 30 to 89 Days Past Due | Accrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0		0
Real estate-construction | Financial Asset, 30 to 89 Days Past Due | Nonaccrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross			0
Real estate-construction | 90 Days or more Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0	$ 0
Real estate-construction | 90 Days or more Past Due | Accrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	$ 0		0
Real estate-construction | 90 Days or more Past Due | Nonaccrual Modified Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross			$ 5,739