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Allowance for Credit Losses - By Loan Class (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Rollforward of transactions in the allowance for credit loan losses by loan class      
Balance at the beginning of the period $ 156,537 $ 157,069 $ 125,972
Losses charged to allowance (16,359) (36,608) (10,184)
Recoveries credited to allowance 3,904 4,274 6,705
Net losses charged to allowance (12,455) (32,334) (3,479)
Provision (credit) charged to operations 15,092 31,802 34,576
Balance at the end of the period 159,174 156,537 157,069
Commercial, financial and agricultural | Commercial      
Rollforward of transactions in the allowance for credit loan losses by loan class      
Charge-down due to customer filing bankruptcy 25,600    
Commercial, financial and agricultural | Domestic | Commercial      
Rollforward of transactions in the allowance for credit loan losses by loan class      
Balance at the beginning of the period 29,853 35,550 26,728
Losses charged to allowance (7,673) (34,149) (9,664)
Recoveries credited to allowance 3,539 4,079 5,433
Net losses charged to allowance (4,134) (30,070) (4,231)
Provision (credit) charged to operations 2,210 24,373 13,053
Balance at the end of the period 27,929 29,853 35,550
Commercial real estate | Domestic | Commercial real estate construction development      
Rollforward of transactions in the allowance for credit loan losses by loan class      
Balance at the beginning of the period 60,639 55,291 44,684
Losses charged to allowance (8,122) (2,228)  
Recoveries credited to allowance     837
Net losses charged to allowance (8,122) (2,228) 837
Provision (credit) charged to operations (3,610) 7,576 9,770
Balance at the end of the period 48,907 60,639 55,291
Commercial real estate | Domestic | Commercial real estate: farmland & commercial      
Rollforward of transactions in the allowance for credit loan losses by loan class      
Balance at the beginning of the period 43,990 42,703 36,474
Recoveries credited to allowance 183 20 143
Net losses charged to allowance 183 20 143
Provision (credit) charged to operations 2,240 1,267 6,086
Balance at the end of the period 46,413 43,990 42,703
Commercial real estate | Domestic | Commercial Real Estate Multifamily Receivable [Member]      
Rollforward of transactions in the allowance for credit loan losses by loan class      
Balance at the beginning of the period 4,869 5,088 3,794
Provision (credit) charged to operations 9,844 (219) 1,294
Balance at the end of the period 14,713 4,869 5,088
Real estate - mortgage | Domestic | Residential First Lien      
Rollforward of transactions in the allowance for credit loan losses by loan class      
Balance at the beginning of the period 5,528 5,812 4,759
Losses charged to allowance (104) (46) (43)
Recoveries credited to allowance 27 38 16
Net losses charged to allowance (77) (8) (27)
Provision (credit) charged to operations 1,274 (276) 1,080
Balance at the end of the period 6,725 5,528 5,812
Real estate - mortgage | Domestic | Residential Junior Lien      
Rollforward of transactions in the allowance for credit loan losses by loan class      
Balance at the beginning of the period 10,031 11,024 8,284
Losses charged to allowance (260)   (298)
Recoveries credited to allowance 133 123 260
Net losses charged to allowance (127) 123 (38)
Provision (credit) charged to operations (484) (1,116) 2,778
Balance at the end of the period 9,420 10,031 11,024
Consumer | Domestic      
Rollforward of transactions in the allowance for credit loan losses by loan class      
Balance at the beginning of the period 281 318 281
Losses charged to allowance (200) (185) (179)
Recoveries credited to allowance 22 13 16
Net losses charged to allowance (178) (172) (163)
Provision (credit) charged to operations 176 135 200
Balance at the end of the period 279 281 318
Foreign | Foreign      
Rollforward of transactions in the allowance for credit loan losses by loan class      
Balance at the beginning of the period 1,346 1,283 968
Recoveries credited to allowance   1  
Net losses charged to allowance   1  
Provision (credit) charged to operations 3,442 62 315
Balance at the end of the period $ 4,788 $ 1,346 $ 1,283