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Loans and Leases - Allowance for Loan and Lease Losses and Recorded Investment in Loans and Leases (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Allowance For Credit Losses, Loans And Leases [Abstract]            
Ending balance: individually analyzed $ 3,108     $ 1,033    
Ending balance: pooled 83,419     85,008    
Financing Receivable, Allowance for Credit Loss 86,527 $ 86,989 $ 87,091 86,041 $ 85,745 $ 85,387
Loans and leases held for investment [Abstract]            
Ending balance: individually analyzed 27,011     14,815    
Ending balance: pooled 6,758,471     6,715,919    
Total Loans and Leases Held for Investment 6,785,482     6,730,734    
Commercial, financial and agricultural            
Allowance For Credit Losses, Loans And Leases [Abstract]            
Ending balance: individually analyzed 2,389     1,010    
Ending balance: pooled 14,159     13,679    
Financing Receivable, Allowance for Credit Loss 16,548 16,979 16,079 14,689 14,545 13,699
Loans and leases held for investment [Abstract]            
Ending balance: individually analyzed 5,635     2,703    
Ending balance: pooled 990,977     1,041,340    
Total Loans and Leases Held for Investment 996,612     1,044,043    
Real estate-commercial            
Allowance For Credit Losses, Loans And Leases [Abstract]            
Ending balance: individually analyzed 154     23    
Ending balance: pooled 45,702     46,611    
Financing Receivable, Allowance for Credit Loss 45,856 46,338 46,867 46,634 45,978 45,849
Loans and leases held for investment [Abstract]            
Ending balance: individually analyzed 15,911     3,680    
Ending balance: pooled 3,501,892     3,438,403    
Total Loans and Leases Held for Investment 3,517,803     3,442,083    
Real estate-construction            
Allowance For Credit Losses, Loans And Leases [Abstract]            
Ending balance: individually analyzed 0     0    
Ending balance: pooled 5,386     5,542    
Financing Receivable, Allowance for Credit Loss 5,386 5,253 4,924 5,542 6,153 6,543
Loans and leases held for investment [Abstract]            
Ending balance: individually analyzed 0     2,799    
Ending balance: pooled 309,365     282,817    
Total Loans and Leases Held for Investment 309,365     285,616    
Real estate-residential secured for business purpose            
Allowance For Credit Losses, Loans And Leases [Abstract]            
Ending balance: individually analyzed 197     0    
Ending balance: pooled 7,375     7,650    
Financing Receivable, Allowance for Credit Loss 7,572 7,468 7,491 7,650 7,739 8,692
Loans and leases held for investment [Abstract]            
Ending balance: individually analyzed 2,736     630    
Ending balance: pooled 542,455     530,044    
Total Loans and Leases Held for Investment 545,191     530,674    
Residential secured for personal purpose            
Allowance For Credit Losses, Loans And Leases [Abstract]            
Ending balance: individually analyzed 0     0    
Ending balance: pooled 6,430     6,893    
Financing Receivable, Allowance for Credit Loss 6,430 6,451 7,222 6,893 6,606 6,349
Loans and leases held for investment [Abstract]            
Ending balance: individually analyzed 656     3,985    
Ending balance: pooled 973,739     965,577    
Total Loans and Leases Held for Investment 974,395     969,562    
Real estate-home equity secured for personal purpose            
Allowance For Credit Losses, Loans And Leases [Abstract]            
Ending balance: individually analyzed 0     0    
Ending balance: pooled 1,616     1,695    
Financing Receivable, Allowance for Credit Loss 1,616 1,609 1,706 1,695 1,688 1,289
Loans and leases held for investment [Abstract]            
Ending balance: individually analyzed 1,705     1,003    
Ending balance: pooled 195,798     181,898    
Total Loans and Leases Held for Investment 197,503     182,901    
Loans to individuals            
Allowance For Credit Losses, Loans And Leases [Abstract]            
Ending balance: individually analyzed 0     0    
Ending balance: pooled 348     340    
Financing Receivable, Allowance for Credit Loss 348 344 342 340 348 392
Loans and leases held for investment [Abstract]            
Ending balance: individually analyzed 0     15    
Ending balance: pooled 13,447     26,779    
Total Loans and Leases Held for Investment 13,447     26,794    
Lease financings            
Allowance For Credit Losses, Loans And Leases [Abstract]            
Ending balance: individually analyzed 368     0    
Ending balance: pooled 2,403     2,598    
Financing Receivable, Allowance for Credit Loss 2,771 $ 2,547 $ 2,460 2,598 $ 2,688 $ 2,574
Loans and leases held for investment [Abstract]            
Ending balance: individually analyzed 368     0    
Ending balance: pooled 230,798     249,061    
Total Loans and Leases Held for Investment $ 231,166     $ 249,061