v3.26.1
Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
May 01, 2025
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning Balance   $ 129,183,000 $ 119,931,000 $ 125,768,000 $ 118,906,000 $ 118,906,000
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date $ 3,560,000   4,116,000   4,116,000  
Charge-offs   (12,960,000) (4,426,000) (22,397,000) (12,436,000) (38,366,000)
Recoveries   1,519,000 1,668,000 2,795,000 6,580,000 8,991,000
Provision for credit losses   9,683,000 11,677,000 21,259,000 15,800,000  
Ending Balance   127,425,000 132,966,000 127,425,000 132,966,000 125,768,000
Nonaccrual Commercial Loans [Member]            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Loans Held for sale, Amount   0   0   0
Time and Demand Loans            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Charge-offs       (8,060,000)   (16,182,000)
Recoveries       419,000   4,223,000
Commercial Credit Cards            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Charge-offs       (277,000)   (302,000)
Recoveries       3,000   35,000
Senior Lien            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Charge-offs       (414,000)   (501,000)
Recoveries       39,000   66,000
Junior Lien            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Charge-offs       (45,000)   (244,000)
Recoveries       34,000   168,000
Multifamily            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Charge-offs       0   (766,000)
Recoveries       0   0
Nonowner Occupied Commercial Real Estate            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Charge-offs       (3,568,000)   (4,770,000)
Recoveries       9,000   148,000
Owner Occupied Commercial Real Estate            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Charge-offs       (952,000)   (1,652,000)
Recoveries       244,000   69,000
Automobiles            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Charge-offs       (3,920,000)   (7,025,000)
Recoveries       1,489,000   2,992,000
Consumer Credit Cards            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Charge-offs       (202,000)   (346,000)
Recoveries       31,000   79,000
Other Consumer Loans            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Charge-offs       (692,000)   (1,516,000)
Recoveries       117,000   351,000
Construction Residential            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Charge-offs       0   (562,000)
Recoveries       0   0
Construction Other            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Charge-offs       (326,000)   (732,000)
Recoveries       0   0
Time and Demand Loans Other            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Charge-offs       (1,049,000)   (1,480,000)
Recoveries       108,000   234,000
Equipment Finance            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Charge-offs       (2,892,000)   (2,288,000)
Recoveries       302,000   626,000
Commercial, financial, agricultural and other [Member]            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning Balance   42,770,000 31,345,000 38,149,000 29,131,000 29,131,000
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 1,616,000   1,616,000   1,616,000  
Charge-offs   (8,264,000) (1,403,000) (12,278,000) (5,422,000)  
Recoveries   426,000 677,000 832,000 4,367,000  
Provision for credit losses   5,613,000 6,317,000 13,842,000 8,860,000  
Ending Balance   40,545,000 38,552,000 40,545,000 38,552,000 38,149,000
Commercial, financial, agricultural and other [Member] | Time and Demand Loans            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning Balance   25,867,000 20,400,000 22,223,000 19,433,000 19,433,000
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 1,616,000   1,616,000   1,616,000  
Charge-offs   (6,143,000) (363,000) (8,060,000) (3,339,000)  
Recoveries   289,000 318,000 419,000 3,802,000  
Provision for credit losses   2,653,000 4,496,000 8,084,000 4,955,000  
Ending Balance   22,666,000 26,467,000 22,666,000 26,467,000 22,223,000
Commercial, financial, agricultural and other [Member] | Commercial Credit Cards            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning Balance   208,000 210,000 177,000 182,000 182,000
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date     0   0  
Charge-offs   (136,000) (26,000) (277,000) (124,000)  
Recoveries   2,000 0 3,000 22,000  
Provision for credit losses   113,000 29,000 284,000 133,000  
Ending Balance   187,000 213,000 187,000 213,000 177,000
Commercial, financial, agricultural and other [Member] | Time and Demand Loans Other            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning Balance   1,805,000 1,959,000 1,611,000 1,672,000 1,672,000
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date     0   0  
Charge-offs   (470,000) (464,000) (1,049,000) (833,000)  
Recoveries   48,000 68,000 108,000 121,000  
Provision for credit losses   1,047,000 922,000 1,760,000 1,525,000  
Ending Balance   2,430,000 2,485,000 2,430,000 2,485,000 1,611,000
Commercial, financial, agricultural and other [Member] | Equipment Finance            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning Balance   14,890,000 8,776,000 14,138,000 7,844,000 7,844,000
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date     0   0  
Charge-offs   (1,515,000) (550,000) (2,892,000) (1,126,000)  
Recoveries   87,000 291,000 302,000 422,000  
Provision for credit losses   1,800,000 870,000 3,714,000 2,247,000  
Ending Balance   15,262,000 9,387,000 15,262,000 9,387,000 14,138,000
Residential real estate [Member]            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning Balance   21,945,000 22,338,000 21,629,000 22,396,000 22,396,000
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 45,000   307,000   307,000  
Charge-offs   (314,000) (118,000) (459,000) (226,000)  
Recoveries   47,000 46,000 73,000 183,000  
Provision for credit losses   588,000 1,195,000 1,023,000 1,108,000  
Ending Balance   22,266,000 23,768,000 22,266,000 23,768,000 21,629,000
Residential real estate [Member] | Senior Lien            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning Balance   15,367,000 15,603,000 15,056,000 15,758,000 15,758,000
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 38,000   300,000   300,000  
Charge-offs   (308,000) (75,000) (414,000) (108,000)  
Recoveries   23,000 26,000 39,000 42,000  
Provision for credit losses   384,000 818,000 785,000 680,000  
Ending Balance   15,466,000 16,672,000 15,466,000 16,672,000 15,056,000
Residential real estate [Member] | Junior Lien            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning Balance   6,578,000 6,735,000 6,573,000 6,638,000 6,638,000
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 7,000   7,000   7,000  
Charge-offs   (6,000) (43,000) (45,000) (118,000)  
Recoveries   24,000 20,000 34,000 141,000  
Provision for credit losses   204,000 377,000 238,000 428,000  
Ending Balance   6,800,000 7,096,000 6,800,000 7,096,000 6,573,000
Commercial Real Estate [Member]            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning Balance   39,794,000 38,371,000 40,271,000 40,232,000 40,232,000
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 1,087,000   1,087,000   1,087,000  
Charge-offs   (2,212,000) (624,000) (4,520,000) (2,088,000)  
Recoveries   213,000 11,000 253,000 167,000  
Provision for credit losses   658,000 2,001,000 2,449,000 1,448,000  
Ending Balance   38,453,000 40,846,000 38,453,000 40,846,000 40,271,000
Commercial Real Estate [Member] | Multifamily            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning Balance   7,522,000 5,478,000 5,528,000 5,431,000 5,431,000
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 120,000   120,000   120,000  
Charge-offs   0 0 0 0  
Recoveries   0 0 0 0  
Provision for credit losses   (273,000) (159,000) 1,721,000 (112,000)  
Ending Balance   7,249,000 5,439,000 7,249,000 5,439,000 5,528,000
Commercial Real Estate [Member] | Nonowner Occupied Commercial Real Estate            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning Balance   21,905,000 21,814,000 24,865,000 23,332,000 23,332,000
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 943,000   943,000   943,000  
Charge-offs   (1,552,000) (1,000) (3,568,000) (875,000)  
Recoveries   3,000 5,000 9,000 115,000  
Provision for credit losses   507,000 145,000 (443,000) (609,000)  
Ending Balance   20,863,000 22,906,000 20,863,000 22,906,000 24,865,000
Commercial Real Estate [Member] | Owner Occupied Commercial Real Estate            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning Balance   10,367,000 11,079,000 9,878,000 11,469,000 11,469,000
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 24,000   24,000   24,000  
Charge-offs   (660,000) (623,000) (952,000) (1,213,000)  
Recoveries   210,000 6,000 244,000 52,000  
Provision for credit losses   424,000 2,015,000 1,171,000 2,169,000  
Ending Balance   10,341,000 12,501,000 10,341,000 12,501,000 9,878,000
Loans to individuals [Member]            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning Balance   17,573,000 21,045,000 17,911,000 21,117,000 21,117,000
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 2,000   2,000   2,000  
Charge-offs   (2,170,000) (2,281,000) (4,814,000) (4,700,000)  
Recoveries   833,000 934,000 1,637,000 1,863,000  
Provision for credit losses   1,640,000 2,564,000 3,142,000 3,982,000  
Ending Balance   17,876,000 22,264,000 17,876,000 22,264,000 17,911,000
Loans to individuals [Member] | Automobiles            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning Balance   14,755,000 19,049,000 14,962,000 18,693,000 18,693,000
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 1,000   1,000   1,000  
Charge-offs   (1,775,000) (1,745,000) (3,920,000) (3,550,000)  
Recoveries   776,000 782,000 1,489,000 1,628,000  
Provision for credit losses   1,322,000 2,096,000 2,547,000 3,411,000  
Ending Balance   15,078,000 20,183,000 15,078,000 20,183,000 14,962,000
Loans to individuals [Member] | Consumer Credit Cards            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning Balance   435,000 323,000 473,000 341,000 341,000
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date     0   0  
Charge-offs   (92,000) (74,000) (202,000) (169,000)  
Recoveries   10,000 30,000 31,000 48,000  
Provision for credit losses   80,000 59,000 131,000 118,000  
Ending Balance   433,000 338,000 433,000 338,000 473,000
Loans to individuals [Member] | Other Consumer Loans            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning Balance   2,383,000 1,673,000 2,476,000 2,083,000 2,083,000
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 1,000   1,000   1,000  
Charge-offs   (303,000) (462,000) (692,000) (981,000)  
Recoveries   47,000 122,000 117,000 187,000  
Provision for credit losses   238,000 409,000 464,000 453,000  
Ending Balance   2,365,000 1,743,000 2,365,000 1,743,000 2,476,000
Real estate construction [Member]            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning Balance   7,101,000 6,832,000 7,808,000 6,030,000 6,030,000
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 810,000   1,104,000   1,104,000  
Charge-offs   0 0 (326,000) 0  
Recoveries   0 0 0 0  
Provision for credit losses   1,184,000 (400,000) 803,000 402,000  
Ending Balance   8,285,000 7,536,000 8,285,000 7,536,000 7,808,000
Real estate construction [Member] | Construction Residential            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning Balance   540,000 157,000 690,000 114,000 114,000
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date 628,000   734,000   734,000  
Charge-offs   0 0 0 0  
Recoveries   0 0 0 0  
Provision for credit losses   44,000 127,000 (106,000) 170,000  
Ending Balance   584,000 1,018,000 584,000 1,018,000 690,000
Real estate construction [Member] | Construction Other            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Beginning Balance   6,561,000 6,675,000 7,118,000 5,916,000 5,916,000
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date $ 182,000   370,000   370,000  
Charge-offs   0 0 (326,000) 0  
Recoveries   0 0 0 0  
Provision for credit losses   1,140,000 (527,000) 909,000 232,000  
Ending Balance   $ 7,701,000 $ 6,518,000 $ 7,701,000 $ 6,518,000 $ 7,118,000