Loans and Leases - Credit Quality Indicators (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	$ 5,310,017	$ 5,306,841
Commercial, Financial and Agricultural [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	956,396	892,665
Paycheck Protection Program Loans [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	31,748	483,773
Real Estate-Commercial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	2,718,535	2,458,872
Real Estate-Construction [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	283,918	243,355
Real Estate-Residential Secured for Business Purpose [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	409,900	381,446
Real Estate-Residential Secured for Personal Purpose [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	540,566	487,600
Real Estate-Home Equity Secured for Personal Purpose [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	158,909	166,609
Loans to Individuals [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	25,504	27,482
Lease Financings [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases held for investment	$ 184,541	$ 165,039