Loans and Leases - Age Analysis of Past Due Loans and Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing Loans and Leases	$ 6,715,415	$ 6,546,695
Nonaccrual Loans and Leases	15,319	20,519
Total Loans and Leases Held for Investment	6,730,734	6,567,214	$ 6,574,958
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	12,729	22,433
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	5,247	2,786
90 Days or more Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	310	534
Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	18,286	25,753
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	6,697,129	6,520,942
Commercial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing Loans and Leases	1,041,340	987,457
Nonaccrual Loans and Leases	2,703	2,266
Total Loans and Leases Held for Investment	1,044,043	989,723	1,050,004
Commercial, financial and agricultural | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	1,008	1,355
Commercial, financial and agricultural | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	888	348
Commercial, financial and agricultural | 90 Days or more Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0	285
Commercial, financial and agricultural | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	1,896	1,988
Commercial, financial and agricultural | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	1,039,444	985,469
Real estate-commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing Loans and Leases	3,438,403	3,297,089
Nonaccrual Loans and Leases	3,680	5,709
Total Loans and Leases Held for Investment	3,442,083	3,302,798	3,275,140
Real estate-commercial | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	3,539	1,763
Real estate-commercial | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	975	1,072
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 | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	4,514	2,835
Real estate-commercial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	3,433,889	3,294,254
Real estate-construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing Loans and Leases	282,817	388,395
Nonaccrual Loans and Leases	2,799	6,067
Total Loans and Leases Held for Investment	285,616	394,462	427,561
Real estate-construction | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	1,831	10,022
Real estate-construction | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0	45
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 | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	1,831	10,067
Real estate-construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	280,986	378,328
Real estate-residential secured for business purpose
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing Loans and Leases	530,044	515,912
Nonaccrual Loans and Leases	630	1,090
Total Loans and Leases Held for Investment	530,674	517,002	516,471
Real estate-residential secured for business purpose | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	1,720	930
Real estate-residential secured for business purpose | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	169	643
Real estate-residential secured for business purpose | 90 Days or more Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0	0
Real estate-residential secured for business purpose | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	1,889	1,573
Real estate-residential secured for business purpose | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	528,155	514,339
Real estate-residential secured for personal purpose
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing Loans and Leases	965,577	904,802
Nonaccrual Loans and Leases	3,985	4,213
Total Loans and Leases Held for Investment	969,562	909,015	861,122
Real estate-residential secured for personal purpose | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	3,292	6,464
Real estate-residential secured for personal purpose | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	644	76
Real estate-residential secured for personal purpose | 90 Days or more Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0	0
Real estate-residential secured for personal purpose | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	3,936	6,540
Real estate-residential secured for personal purpose | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	961,641	898,262
Real estate-home equity secured for personal purpose
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing Loans and Leases	181,898	178,166
Nonaccrual Loans and Leases	1,003	1,116
Total Loans and Leases Held for Investment	182,901	179,282	176,855
Real estate-home equity secured for personal purpose | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	429	721
Real estate-home equity secured for personal purpose | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	829	144
Real estate-home equity secured for personal purpose | 90 Days or more Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	0	0
Real estate-home equity secured for personal purpose | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	1,258	865
Real estate-home equity secured for personal purpose | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	180,640	177,301
Loans to individuals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing Loans and Leases	26,779	27,749
Nonaccrual Loans and Leases	15	0
Total Loans and Leases Held for Investment	26,794	27,749	27,331
Loans to individuals | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	70	191
Loans to individuals | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	77	84
Loans to individuals | 90 Days or more Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	28	37
Loans to individuals | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	175	312
Loans to individuals | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	26,604	27,437
Lease financings
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing Loans and Leases	248,557	247,125
Nonaccrual Loans and Leases	504	58
Total Loans and Leases Held for Investment	249,061	247,183	$ 240,474
Lease financings | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	840	987
Lease financings | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	1,665	374
Lease financings | 90 Days or more Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	282	212
Lease financings | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	2,787	1,573
Lease financings | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	$ 245,770	$ 245,552