Loans and Leases - Aging Analysis of Accruing and Nonaccrual Modified Loans to Borrowers Experiencing Financial Difficult (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of deferred income	$ 6,239,804	$ 6,123,230	$ 5,400,786
Accrual Modified Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of deferred income	5,829
Nonaccrual Modified Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of deferred income	2,620
Financial Asset Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	6,219,677	6,093,031
Financial Asset Not Past Due | Accrual Modified Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	5,829
Financial Asset Not Past Due | Nonaccrual Modified Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	2,620
Financial Asset, 30 to 89 Days Past Due | Accrual Modified Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0
Financial Asset, 30 to 89 Days Past Due | Nonaccrual Modified Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	1,996	875
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Accrual Modified Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Nonaccrual Modified Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0
Real-Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of deferred income	376,569	381,811	285,083
Real-Estate Construction [Member] | Accrual Modified Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of deferred income	5,829
Real-Estate Construction [Member] | Financial Asset Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	376,186	381,496
Real-Estate Construction [Member] | Financial Asset Not Past Due | Accrual Modified Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	5,829
Real-Estate Construction [Member] | Financial Asset, 30 to 89 Days Past Due | Accrual Modified Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0
Real-Estate Construction [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0	0
Real-Estate Construction [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Accrual Modified Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0
Commercial Financial And Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of deferred income	1,032,753	1,088,928	$ 942,783
Commercial Financial And Agricultural [Member] | Nonaccrual Modified Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, net of deferred income	2,620
Commercial Financial And Agricultural [Member] | Financial Asset Not Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	1,027,982	1,081,897
Commercial Financial And Agricultural [Member] | Financial Asset Not Past Due | Nonaccrual Modified Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	2,620
Commercial Financial And Agricultural [Member] | Financial Asset, 30 to 89 Days Past Due | Nonaccrual Modified Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0
Commercial Financial And Agricultural [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0	$ 0
Commercial Financial And Agricultural [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Nonaccrual Modified Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	$ 0