v3.26.3
CAPITAL AND REGULATORY MATTERS - Actual Capital Amounts and Ratios (Details)
$ in Thousands
Sep. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
SPFI [Member]    
Total Capital to Risk Weighted Assets:    
Actual, Amount $ 726,519 $ 622,485
Actual, Ratio 0.1661 0.1726
Minimum Required Under BASEL III Fully Phased In, Amount $ 459,360 $ 378,645
Minimum Required Under BASEL III Fully Phased In, Ratio 0.105 0.105
Tier 1 Capital to Risk Weighted Assets:    
Actual, Amount $ 666,380 $ 566,107
Actual, Ratio 0.1523 0.157
Minimum Required Under BASEL III Fully Phased In, Amount $ 371,863 $ 306,522
Minimum Required Under BASEL III Fully Phased In, Ratio 0.085 0.085
Common Equity Tier 1 to Risk Weighted Assets:    
Actual, Amount $ 621,380 $ 521,107
Actual, Ratio 0.142 0.1445
Minimum Required Under BASEL III Fully Phased In, Amount $ 306,240 $ 252,430
Minimum Required Under BASEL III Fully Phased In, Ratio 0.07 0.07
Tier 1 Capital to Average Assets:    
Actual, Amount $ 666,380 $ 566,107
Actual, Ratio 0.1242 0.1253
Minimum Required Under BASEL III Fully Phased In, Amount $ 217,484 $ 181,591
Minimum Required Under BASEL III Fully Phased In, Ratio 0.04 0.04
City Bank [Member]    
Total Capital to Risk Weighted Assets:    
Actual, Amount $ 632,884 $ 537,444
Actual, Ratio 0.1447 0.1491
Minimum Required Under BASEL III Fully Phased In, Amount $ 459,140 $ 378,576
Minimum Required Under BASEL III Fully Phased In, Ratio 0.105 0.105
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 437,276 $ 360,549
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 0.10 0.10
Tier 1 Capital to Risk Weighted Assets:    
Actual, Amount $ 584,025 $ 492,355
Actual, Ratio 0.1336 0.1366
Minimum Required Under BASEL III Fully Phased In, Amount $ 371,685 $ 306,466
Minimum Required Under BASEL III Fully Phased In, Ratio 0.085 0.085
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 349,821 $ 288,439
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 0.08 0.08
Common Equity Tier 1 to Risk Weighted Assets:    
Actual, Amount $ 584,025 $ 492,355
Actual, Ratio 0.1336 0.1366
Minimum Required Under BASEL III Fully Phased In, Amount $ 306,093 $ 252,384
Minimum Required Under BASEL III Fully Phased In, Ratio 0.07 0.07
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 284,229 $ 234,357
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 0.065 0.065
Tier 1 Capital to Average Assets:    
Actual, Amount $ 584,025 $ 492,355
Actual, Ratio 0.1089 0.109
Minimum Required Under BASEL III Fully Phased In, Amount $ 217,368 $ 181,512
Minimum Required Under BASEL III Fully Phased In, Ratio 0.04 0.04
To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount $ 268,117 $ 225,868
To Be Well Capitalized Under Prompt Corrective Action Provisions, Ratio 0.05 0.05