Loans and Leases - Age Analysis of Past Due Loans and Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing Loans and Leases	$ 6,558,731	$ 6,546,695
Nonaccrual Loans and Leases	20,355	20,519
Total Loans and Leases Held for Investment	6,579,086	6,567,214	$ 6,239,804
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	14,157	22,433
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	2,800	2,786
90 Days or more Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	268	534
Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	17,225	25,753
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	6,541,506	6,520,942
Commercial, financial and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing Loans and Leases	1,011,192	987,457
Nonaccrual Loans and Leases	3,376	2,266
Total Loans and Leases Held for Investment	1,014,568	989,723	1,032,753
Commercial, financial and agricultural | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	1,432	1,355
Commercial, financial and agricultural | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	601	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	2,033	1,988
Commercial, financial and agricultural | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	1,009,159	985,469
Real estate-commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing Loans and Leases	3,280,008	3,297,089
Nonaccrual Loans and Leases	3,721	5,709
Total Loans and Leases Held for Investment	3,283,729	3,302,798	3,128,210
Real estate-commercial | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	4,836	1,763
Real estate-commercial | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	1,342	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	6,178	2,835
Real estate-commercial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	3,273,830	3,294,254
Real estate-construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing Loans and Leases	374,257	388,395
Nonaccrual Loans and Leases	5,738	6,067
Total Loans and Leases Held for Investment	379,995	394,462	376,569
Real estate-construction | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	809	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	809	10,067
Real estate-construction | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	373,448	378,328
Real estate-residential secured for business purpose
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing Loans and Leases	522,477	515,912
Nonaccrual Loans and Leases	1,719	1,090
Total Loans and Leases Held for Investment	524,196	517,002	498,505
Real estate-residential secured for business purpose | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	336	930
Real estate-residential secured for business purpose | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	161	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	497	1,573
Real estate-residential secured for business purpose | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	521,980	514,339
Real estate-residential secured for personal purpose
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing Loans and Leases	918,566	904,802
Nonaccrual Loans and Leases	3,846	4,213
Total Loans and Leases Held for Investment	922,412	909,015	779,557
Real estate-residential secured for personal purpose | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	4,330	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	76	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	4,406	6,540
Real estate-residential secured for personal purpose | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	914,160	898,262
Real estate-home equity secured for personal purpose
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing Loans and Leases	176,160	178,166
Nonaccrual Loans and Leases	1,286	1,116
Total Loans and Leases Held for Investment	177,446	179,282	172,073
Real estate-home equity secured for personal purpose | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	1,106	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	166	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	1,272	865
Real estate-home equity secured for personal purpose | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	174,888	177,301
Loans to individuals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing Loans and Leases	27,200	27,749
Nonaccrual Loans and Leases	0	0
Total Loans and Leases Held for Investment	27,200	27,749	28,656
Loans to individuals | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	44	191
Loans to individuals | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	79	84
Loans to individuals | 90 Days or more Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	70	37
Loans to individuals | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	193	312
Loans to individuals | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	27,007	27,437
Lease financings
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Accruing Loans and Leases	248,871	247,125
Nonaccrual Loans and Leases	669	58
Total Loans and Leases Held for Investment	249,540	247,183	$ 223,481
Lease financings | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	1,264	987
Lease financings | 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	375	374
Lease financings | 90 Days or more Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	198	212
Lease financings | Total Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	1,837	1,573
Lease financings | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financial receivables, gross	$ 247,034	$ 245,552