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CECL (Details 15)
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Number of Macroeconomic Scenarios 3  
Number of Macroeconomic Factors 38  
Scenario, Macroeconomic scenario, Downside [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Macroeconomic Scenario Probability, in percent   40.00%
Scenario, Macroeconomic scenario, Mild Downside [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Macroeconomic Scenario Probability, in percent 15.00%  
Scenario, Macroeconomic scenario, Severe Downside [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Macroeconomic Scenario Probability, in percent 25.00%  
Scenario, Macroeconomic scenario, Downside, Forecast, One year [Member] | Real GDP growth rate (%YoY) [Member] | UNITED STATES [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   (1.70%)
Scenario, Macroeconomic scenario, Downside, Forecast, One year [Member] | Real GDP growth rate (%YoY) [Member] | CHINA [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   (0.90%)
Scenario, Macroeconomic scenario, Downside, Forecast, One year [Member] | Nominal GDP growth rate (%YoY) [Member] | SWITZERLAND [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   0.00%
Scenario, Macroeconomic scenario, Downside, Forecast, One year [Member] | Nominal GDP growth rate (%YoY) [Member] | European Union (EU) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   3.40%
Scenario, Macroeconomic scenario, Downside, Forecast, One year [Member] | Industrial production (%YoY) [Member] | World [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   (6.80%)
Scenario, Macroeconomic scenario, Mild Downside, Forecast, One year [Member] | Real GDP growth rate (%YoY) [Member] | UNITED STATES [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent (0.60%)  
Scenario, Macroeconomic scenario, Mild Downside, Forecast, One year [Member] | Real GDP growth rate (%YoY) [Member] | CHINA [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent 2.20%  
Scenario, Macroeconomic scenario, Mild Downside, Forecast, One year [Member] | Nominal GDP growth rate (%YoY) [Member] | SWITZERLAND [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent (1.00%)  
Scenario, Macroeconomic scenario, Mild Downside, Forecast, One year [Member] | Nominal GDP growth rate (%YoY) [Member] | European Union (EU) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent (1.00%)  
Scenario, Macroeconomic scenario, Mild Downside, Forecast, One year [Member] | Avg Earnings Bulk Carrier (USD per Day) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast $ 10,096  
Scenario, Macroeconomic scenario, Mild Downside, Forecast, One year [Member] | Avg Earnings Tanker (USD per Day) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast $ 42,458  
Scenario, Macroeconomic scenario, Severe Downside, Forecast, One year [Member] | Real GDP growth rate (%YoY) [Member] | UNITED STATES [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent (3.30%)  
Scenario, Macroeconomic scenario, Severe Downside, Forecast, One year [Member] | Real GDP growth rate (%YoY) [Member] | CHINA [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent (1.50%)  
Scenario, Macroeconomic scenario, Severe Downside, Forecast, One year [Member] | Nominal GDP growth rate (%YoY) [Member] | SWITZERLAND [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent 0.70%  
Scenario, Macroeconomic scenario, Severe Downside, Forecast, One year [Member] | Nominal GDP growth rate (%YoY) [Member] | European Union (EU) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent 3.30%  
Scenario, Macroeconomic scenario, Severe Downside, Forecast, One year [Member] | Avg Earnings Bulk Carrier (USD per Day) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast $ 8,614  
Scenario, Macroeconomic scenario, Severe Downside, Forecast, One year [Member] | Avg Earnings Tanker (USD per Day) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast $ 31,758  
Scenario, Macroeconomic scenario, Downside, Forecast, Two years [Member] | Real GDP growth rate (%YoY) [Member] | UNITED STATES [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   0.50%
Scenario, Macroeconomic scenario, Downside, Forecast, Two years [Member] | Real GDP growth rate (%YoY) [Member] | CHINA [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   2.10%
Scenario, Macroeconomic scenario, Downside, Forecast, Two years [Member] | Nominal GDP growth rate (%YoY) [Member] | SWITZERLAND [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   1.00%
Scenario, Macroeconomic scenario, Downside, Forecast, Two years [Member] | Nominal GDP growth rate (%YoY) [Member] | European Union (EU) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   2.30%
Scenario, Macroeconomic scenario, Downside, Forecast, Two years [Member] | Industrial production (%YoY) [Member] | World [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   0.40%
Scenario, Macroeconomic scenario, Mild Downside, Forecast, Two years [Member] | Real GDP growth rate (%YoY) [Member] | UNITED STATES [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent 0.30%  
Scenario, Macroeconomic scenario, Mild Downside, Forecast, Two years [Member] | Real GDP growth rate (%YoY) [Member] | CHINA [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent 3.30%  
Scenario, Macroeconomic scenario, Mild Downside, Forecast, Two years [Member] | Nominal GDP growth rate (%YoY) [Member] | SWITZERLAND [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent 0.00%  
Scenario, Macroeconomic scenario, Mild Downside, Forecast, Two years [Member] | Nominal GDP growth rate (%YoY) [Member] | European Union (EU) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent 0.40%  
Scenario, Macroeconomic scenario, Mild Downside, Forecast, Two years [Member] | Avg Earnings Bulk Carrier (USD per Day) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast $ 10,930  
Scenario, Macroeconomic scenario, Mild Downside, Forecast, Two years [Member] | Avg Earnings Tanker (USD per Day) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast $ 38,392  
Scenario, Macroeconomic scenario, Severe Downside, Forecast, Two years [Member] | Real GDP growth rate (%YoY) [Member] | UNITED STATES [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent (1.20%)  
Scenario, Macroeconomic scenario, Severe Downside, Forecast, Two years [Member] | Real GDP growth rate (%YoY) [Member] | CHINA [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent 1.40%  
Scenario, Macroeconomic scenario, Severe Downside, Forecast, Two years [Member] | Nominal GDP growth rate (%YoY) [Member] | SWITZERLAND [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent 2.00%  
Scenario, Macroeconomic scenario, Severe Downside, Forecast, Two years [Member] | Nominal GDP growth rate (%YoY) [Member] | European Union (EU) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent 2.10%  
Scenario, Macroeconomic scenario, Severe Downside, Forecast, Two years [Member] | Avg Earnings Bulk Carrier (USD per Day) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast $ 10,391  
Scenario, Macroeconomic scenario, Severe Downside, Forecast, Two years [Member] | Avg Earnings Tanker (USD per Day) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast $ 25,269  
Scenario, Macroeconomic scenario, Baseline [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Macroeconomic Scenario Probability, in percent 60.00% 50.00%
Scenario, Macroeconomic scenario, Baseline, Forecast, One year [Member] | Real GDP growth rate (%YoY) [Member] | UNITED STATES [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent 0.70% 0.90%
Scenario, Macroeconomic scenario, Baseline, Forecast, One year [Member] | Real GDP growth rate (%YoY) [Member] | CHINA [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent 4.10% 4.50%
Scenario, Macroeconomic scenario, Baseline, Forecast, One year [Member] | Nominal GDP growth rate (%YoY) [Member] | SWITZERLAND [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent 2.70% 2.70%
Scenario, Macroeconomic scenario, Baseline, Forecast, One year [Member] | Nominal GDP growth rate (%YoY) [Member] | European Union (EU) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent 3.90% 5.20%
Scenario, Macroeconomic scenario, Baseline, Forecast, One year [Member] | Industrial production (%YoY) [Member] | World [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   1.20%
Scenario, Macroeconomic scenario, Baseline, Forecast, One year [Member] | Avg Earnings Bulk Carrier (USD per Day) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast $ 12,552  
Scenario, Macroeconomic scenario, Baseline, Forecast, One year [Member] | Avg Earnings Tanker (USD per Day) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast $ 49,865  
Scenario, Macroeconomic scenario, Baseline, Forecast, Two years [Member] | Real GDP growth rate (%YoY) [Member] | UNITED STATES [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent 2.40% 1.50%
Scenario, Macroeconomic scenario, Baseline, Forecast, Two years [Member] | Real GDP growth rate (%YoY) [Member] | CHINA [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent 4.80% 4.90%
Scenario, Macroeconomic scenario, Baseline, Forecast, Two years [Member] | Nominal GDP growth rate (%YoY) [Member] | SWITZERLAND [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent 3.20% 2.00%
Scenario, Macroeconomic scenario, Baseline, Forecast, Two years [Member] | Nominal GDP growth rate (%YoY) [Member] | European Union (EU) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent 3.20% 4.10%
Scenario, Macroeconomic scenario, Baseline, Forecast, Two years [Member] | Industrial production (%YoY) [Member] | World [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   1.90%
Scenario, Macroeconomic scenario, Baseline, Forecast, Two years [Member] | Avg Earnings Bulk Carrier (USD per Day) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast $ 12,346  
Scenario, Macroeconomic scenario, Baseline, Forecast, Two years [Member] | Avg Earnings Tanker (USD per Day) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast $ 53,895  
Scenario, Macroeconomic scenario, Upside [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Macroeconomic Scenario Probability, in percent   10.00%
Scenario, Macroeconomic scenario, Upside, Forecast, One year [Member] | Real GDP growth rate (%YoY) [Member] | UNITED STATES [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   1.20%
Scenario, Macroeconomic scenario, Upside, Forecast, One year [Member] | Real GDP growth rate (%YoY) [Member] | CHINA [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   6.20%
Scenario, Macroeconomic scenario, Upside, Forecast, One year [Member] | Nominal GDP growth rate (%YoY) [Member] | SWITZERLAND [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   3.20%
Scenario, Macroeconomic scenario, Upside, Forecast, One year [Member] | Nominal GDP growth rate (%YoY) [Member] | European Union (EU) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   5.50%
Scenario, Macroeconomic scenario, Upside, Forecast, One year [Member] | Industrial production (%YoY) [Member] | World [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   3.90%
Scenario, Macroeconomic scenario, Upside, Forecast, Two years [Member] | Real GDP growth rate (%YoY) [Member] | UNITED STATES [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   2.00%
Scenario, Macroeconomic scenario, Upside, Forecast, Two years [Member] | Real GDP growth rate (%YoY) [Member] | CHINA [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   5.80%
Scenario, Macroeconomic scenario, Upside, Forecast, Two years [Member] | Nominal GDP growth rate (%YoY) [Member] | SWITZERLAND [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   2.10%
Scenario, Macroeconomic scenario, Upside, Forecast, Two years [Member] | Nominal GDP growth rate (%YoY) [Member] | European Union (EU) [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   3.80%
Scenario, Macroeconomic scenario, Upside, Forecast, Two years [Member] | Industrial production (%YoY) [Member] | World [Member]    
Allowance for Credit Loss, Macroeconomic scenarios [Line Items]    
Allowance for Credit Losses, Macroeconomic Forecast, in percent   3.90%