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Derivatives (Narrative) (Details)
MMBTU in Thousands, Boe in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
company
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Boe
MMBTU
company
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Boe
MMBTU
company
Derivative [Line Items]          
Derivative assets - Fair value $ 588,582   $ 588,582   $ 602,754
Derivative liabilities - Fair value 448,921   448,921   424,828
Credit-risk-related contingent features          
Derivative [Line Items]          
Aggregate fair value of derivative instruments in net liability position 89,300   89,300   107,400
Collateral posted 89,100   89,100   106,800
Derivative instruments designated as hedging instruments          
Derivative [Line Items]          
Derivative assets - Fair value 0   0   0
Notional Amount 360,176   360,176   359,269
Derivative liabilities - Fair value 1,379   1,379   2,099
Derivative instruments designated as hedging instruments | Fair Value Hedging | Interest Expense          
Derivative [Line Items]          
Gains or losses recognized on Consolidated Statement of Income related to the derivatives designated as fair value hedges   $ (357)   $ (1,700)  
Derivative instruments designated as hedging instruments | Fair Value Hedging | Interest Expense | Deposits          
Derivative [Line Items]          
Gains or losses recognized on Consolidated Statement of Income related to the derivatives designated as fair value hedges 0   0    
Derivative instruments designated as hedging instruments | Interest rate contracts | Cash Flow Hedging          
Derivative [Line Items]          
Derivative assets - Fair value 0   0   0
Net unrealized losses, net of tax, recorded in AOCI expected to be reclassified into earnings during next 12 months 605   605    
Notional Amount 275,000   275,000   275,000
Derivative liabilities - Fair value 1,184   1,184   1,864
Derivative instruments designated as hedging instruments | Interest rate contracts | Fair Value Hedging          
Derivative [Line Items]          
Derivative assets - Fair value 0   0   0
Derivative instruments designated as hedging instruments | Interest rate contracts | Fair Value Hedging | Interest Expense          
Derivative [Line Items]          
Change in unrealized gains or losses on fair value hedging instruments 0 $ 951 0 $ 3,000  
Derivatives not designated as hedging instruments          
Derivative [Line Items]          
Derivative assets - Fair value 588,582   588,582   602,754
Notional Amount 21,676,672   21,676,672   21,341,158
Derivative liabilities - Fair value 447,542   447,542   422,729
Derivatives not designated as hedging instruments | Foreign exchange contracts          
Derivative [Line Items]          
Derivative assets - Fair value 29,867   29,867   30,300
Notional Amount 3,756,284   3,756,284   3,108,488
Derivative liabilities - Fair value 20,360   20,360   22,524
Derivatives not designated as hedging instruments | Interest rate contracts          
Derivative [Line Items]          
Derivative assets - Fair value 329,953   329,953   489,132
Notional Amount 17,836,695   17,836,695   18,155,678
Derivative liabilities - Fair value 227,768   227,768   315,834
Derivatives not designated as hedging instruments | Interest rate contracts | Financial Counterparty          
Derivative [Line Items]          
Notional Amount 8,930,000   8,930,000   9,090,000
Derivatives not designated as hedging instruments | Interest rate contracts | LCH          
Derivative [Line Items]          
Derivative assets - Fair value 13,400   13,400   1,300
Notional Amount 2,960,000   2,960,000   2,980,000
Derivative liabilities - Fair value 120,000   120,000   187,400
Derivatives not designated as hedging instruments | Credit contracts          
Derivative [Line Items]          
Derivative assets - Fair value 3   3   13
Notional Amount 83,693   83,693   76,992
Derivative liabilities - Fair value 87   87   206
Derivatives not designated as hedging instruments | Credit contracts | RPAs - protection sold          
Derivative [Line Items]          
Maximum exposure of RPAs with protection sold 5,000   $ 5,000   $ 6,000
Weighted average remaining maturity of outstanding RPAs     3 years 8 months 12 days   3 years 6 months
Derivatives not designated as hedging instruments | Equity, Public Companies          
Derivative [Line Items]          
Number of companies that issued the equity (issuers portion only) | company         2
Derivatives not designated as hedging instruments | Equity contracts          
Derivative [Line Items]          
Derivative assets - Fair value 223   $ 223   $ 858
Notional Amount 0   0   0
Derivative liabilities - Fair value 0   0   0
Derivatives not designated as hedging instruments | Commodity contracts          
Derivative [Line Items]          
Derivative assets - Fair value 228,536   228,536   82,451
Notional Amount 0   0   0
Derivative liabilities - Fair value 199,327   199,327   84,165
Derivatives not designated as hedging instruments | Commodity contracts | Chicago Mercantile Exchange (CME)          
Derivative [Line Items]          
Derivative assets - Fair value 3,800   3,800   7,900
Derivative liabilities - Fair value 29,200   29,200   3,700
Derivative assets (liabilities), at fair value, net $ 3,900   $ 3,900   $ 0
Derivatives not designated as hedging instruments | Commodity contracts | Chicago Mercantile Exchange (CME) | Oil          
Derivative [Line Items]          
Derivative, nonmonetary notional amount, energy measure | Boe     1,097   1,275
Derivatives not designated as hedging instruments | Commodity contracts | Chicago Mercantile Exchange (CME) | Natural gas          
Derivative [Line Items]          
Derivative, nonmonetary notional amount, energy measure | MMBTU     26,515   29,733
Derivatives not designated as hedging instruments | Equity, Private Companies          
Derivative [Line Items]          
Number of companies that issued the equity (issuers portion only) | company 14   14   17
Maximum | Derivatives not designated as hedging instruments | Foreign exchange contracts          
Derivative [Line Items]          
Original maturity (in years)     1 year   1 year