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Fair Value Measurement and Fair Value of Financial Instruments - Schedule Of Financial Assets (Liabilities) Measured At Fair Value On a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Affordable housing partnership, tax credit and CRA investments, net:    
Total affordable housing partnership, tax credit and CRA investments, net $ 924,439 $ 905,036
Derivative    
Derivative assets - Fair value 490,588 610,920
Net derivative assets 144,980 298,128
Derivative liabilities - Fair value 465,842 613,314
Net derivative liabilities 370,495 537,144
Fair Value 10,133,877 6,188,337
Government National Mortgage Association (GNMA)    
Derivative    
Fair Value 6,300,000 1,200,000
U.S. Treasury securities    
Derivative    
Fair Value 641,573 1,060,375
U.S. government agency and U.S. government-sponsored enterprise debt securities    
Derivative    
Fair Value 272,448 364,446
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities    
Derivative    
Fair Value 444,877 468,259
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities    
Derivative    
Fair Value 6,867,924 1,727,594
Municipal securities    
Derivative    
Fair Value 260,298 261,016
Non-agency commercial mortgage-backed securities    
Derivative    
Fair Value 316,513 367,516
Non-agency residential mortgage-backed securities    
Derivative    
Fair Value 479,327 553,671
Corporate debt securities    
Derivative    
Fair Value 531,819 502,425
Foreign government bonds    
Derivative    
Fair Value 238,869 227,874
Asset-backed securities    
Derivative    
Fair Value 35,735 42,300
Collateralized loan obligations (“CLOs”)    
Derivative    
Fair Value 44,494 612,861
Fair Value, Measurements, Recurring    
Available-for-sale debt securities    
Fair Value 10,133,877 6,188,337
Affordable housing partnership, tax credit and CRA investments, net:    
Equity securities 25,589 24,659
Total affordable housing partnership, tax credit and CRA investments, net 25,589 24,659
Other assets:    
Equity securities 7,852  
Total other assets 7,852  
Derivative    
Derivative assets - Fair value 490,588 610,920
Netting adjustments (345,608) (312,792)
Net derivative assets 144,980 298,128
Derivative liabilities - Fair value 465,842 613,314
Netting adjustments (95,347) (76,170)
Net derivative liabilities 370,495 537,144
Fair Value, Measurements, Recurring | Interest rate contracts    
Derivative    
Derivative assets - Fair value 391,410 473,907
Derivative liabilities - Fair value 327,038 433,936
Fair Value, Measurements, Recurring | Foreign exchange contracts    
Derivative    
Derivative assets - Fair value 33,966 57,072
Derivative liabilities - Fair value 33,651 42,564
Fair Value, Measurements, Recurring | Equity contracts    
Derivative    
Derivative assets - Fair value 232 336
Derivative liabilities - Fair value 15,119 15,119
Fair Value, Measurements, Recurring | Credit contracts    
Derivative    
Derivative assets - Fair value   1
Derivative liabilities - Fair value 32 25
Fair Value, Measurements, Recurring | Commodity contracts    
Derivative    
Derivative assets - Fair value 64,980 79,604
Derivative liabilities - Fair value 90,002 121,670
Fair Value, Measurements, Recurring | U.S. Treasury securities    
Available-for-sale debt securities    
Fair Value 641,573 1,060,375
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government-sponsored enterprise debt securities    
Available-for-sale debt securities    
Fair Value 272,448 364,446
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 444,877 468,259
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 6,867,924 1,727,594
Fair Value, Measurements, Recurring | Municipal securities    
Available-for-sale debt securities    
Fair Value 260,298 261,016
Fair Value, Measurements, Recurring | Non-agency commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 316,513 367,516
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 479,327 553,671
Fair Value, Measurements, Recurring | Corporate debt securities    
Available-for-sale debt securities    
Fair Value 531,819 502,425
Fair Value, Measurements, Recurring | Foreign government bonds    
Available-for-sale debt securities    
Fair Value 238,869 227,874
Fair Value, Measurements, Recurring | Asset-backed securities    
Available-for-sale debt securities    
Fair Value 35,735 42,300
Fair Value, Measurements, Recurring | Collateralized loan obligations (“CLOs”)    
Available-for-sale debt securities    
Fair Value 44,494 612,861
Fair Value, Measurements, Recurring | Level 1    
Available-for-sale debt securities    
Fair Value 641,573 1,060,375
Affordable housing partnership, tax credit and CRA investments, net:    
Equity securities 21,345 20,509
Total affordable housing partnership, tax credit and CRA investments, net 21,345 20,509
Other assets:    
Equity securities 7,852  
Total other assets 7,852  
Derivative    
Derivative assets - Fair value 0 0
Netting adjustments 0 0
Net derivative assets 0 0
Derivative liabilities - Fair value 0 0
Netting adjustments 0 0
Net derivative liabilities 0 0
Fair Value, Measurements, Recurring | Level 1 | Interest rate contracts    
Derivative    
Derivative assets - Fair value 0 0
Derivative liabilities - Fair value 0 0
Fair Value, Measurements, Recurring | Level 1 | Foreign exchange contracts    
Derivative    
Derivative assets - Fair value 0 0
Derivative liabilities - Fair value 0 0
Fair Value, Measurements, Recurring | Level 1 | Equity contracts    
Derivative    
Derivative assets - Fair value 0 0
Derivative liabilities - Fair value 0 0
Fair Value, Measurements, Recurring | Level 1 | Credit contracts    
Derivative    
Derivative assets - Fair value   0
Derivative liabilities - Fair value 0 0
Fair Value, Measurements, Recurring | Level 1 | Commodity contracts    
Derivative    
Derivative assets - Fair value 0 0
Derivative liabilities - Fair value 0 0
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury securities    
Available-for-sale debt securities    
Fair Value 641,573 1,060,375
Fair Value, Measurements, Recurring | Level 1 | U.S. government agency and U.S. government-sponsored enterprise debt securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 1 | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 1 | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 1 | Municipal securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 1 | Non-agency commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 1 | Non-agency residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 1 | Corporate debt securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 1 | Foreign government bonds    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 1 | Collateralized loan obligations (“CLOs”)    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 2    
Available-for-sale debt securities    
Fair Value 9,492,304 5,127,962
Affordable housing partnership, tax credit and CRA investments, net:    
Equity securities 4,244 4,150
Total affordable housing partnership, tax credit and CRA investments, net 4,244 4,150
Other assets:    
Equity securities 0  
Total other assets 0  
Derivative    
Derivative assets - Fair value 490,356 610,584
Netting adjustments (345,608) (312,792)
Net derivative assets 144,748 297,792
Derivative liabilities - Fair value 450,723 598,195
Netting adjustments (95,347) (76,170)
Net derivative liabilities 355,376 522,025
Fair Value, Measurements, Recurring | Level 2 | Interest rate contracts    
Derivative    
Derivative assets - Fair value 391,410 473,907
Derivative liabilities - Fair value 327,038 433,936
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange contracts    
Derivative    
Derivative assets - Fair value 33,966 57,072
Derivative liabilities - Fair value 33,651 42,564
Fair Value, Measurements, Recurring | Level 2 | Equity contracts    
Derivative    
Derivative assets - Fair value 0 0
Derivative liabilities - Fair value 0 0
Fair Value, Measurements, Recurring | Level 2 | Credit contracts    
Derivative    
Derivative assets - Fair value   1
Derivative liabilities - Fair value 32 25
Fair Value, Measurements, Recurring | Level 2 | Commodity contracts    
Derivative    
Derivative assets - Fair value 64,980 79,604
Derivative liabilities - Fair value 90,002 121,670
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 2 | U.S. government agency and U.S. government-sponsored enterprise debt securities    
Available-for-sale debt securities    
Fair Value 272,448 364,446
Fair Value, Measurements, Recurring | Level 2 | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 444,877 468,259
Fair Value, Measurements, Recurring | Level 2 | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 6,867,924 1,727,594
Fair Value, Measurements, Recurring | Level 2 | Municipal securities    
Available-for-sale debt securities    
Fair Value 260,298 261,016
Fair Value, Measurements, Recurring | Level 2 | Non-agency commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 316,513 367,516
Fair Value, Measurements, Recurring | Level 2 | Non-agency residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 479,327 553,671
Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities    
Available-for-sale debt securities    
Fair Value 531,819 502,425
Fair Value, Measurements, Recurring | Level 2 | Foreign government bonds    
Available-for-sale debt securities    
Fair Value 238,869 227,874
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities    
Available-for-sale debt securities    
Fair Value 35,735 42,300
Fair Value, Measurements, Recurring | Level 2 | Collateralized loan obligations (“CLOs”)    
Available-for-sale debt securities    
Fair Value 44,494 612,861
Fair Value, Measurements, Recurring | Level 3    
Available-for-sale debt securities    
Fair Value 0 0
Affordable housing partnership, tax credit and CRA investments, net:    
Equity securities 0 0
Total affordable housing partnership, tax credit and CRA investments, net 0 0
Other assets:    
Equity securities 0  
Total other assets 0  
Derivative    
Derivative assets - Fair value 232 336
Netting adjustments 0 0
Net derivative assets 232 336
Derivative liabilities - Fair value 15,119 15,119
Netting adjustments 0 0
Net derivative liabilities 15,119 15,119
Fair Value, Measurements, Recurring | Level 3 | Interest rate contracts    
Derivative    
Derivative assets - Fair value 0 0
Derivative liabilities - Fair value 0 0
Fair Value, Measurements, Recurring | Level 3 | Foreign exchange contracts    
Derivative    
Derivative assets - Fair value 0 0
Derivative liabilities - Fair value 0 0
Fair Value, Measurements, Recurring | Level 3 | Equity contracts    
Derivative    
Derivative assets - Fair value 232 336
Derivative liabilities - Fair value 15,119 15,119
Fair Value, Measurements, Recurring | Level 3 | Credit contracts    
Derivative    
Derivative assets - Fair value   0
Derivative liabilities - Fair value 0 0
Fair Value, Measurements, Recurring | Level 3 | Commodity contracts    
Derivative    
Derivative assets - Fair value 0 0
Derivative liabilities - Fair value 0 0
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 3 | U.S. government agency and U.S. government-sponsored enterprise debt securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 3 | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 3 | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 3 | Municipal securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 3 | Non-agency commercial mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 3 | Non-agency residential mortgage-backed securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 3 | Foreign government bonds    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities    
Available-for-sale debt securities    
Fair Value 0 0
Fair Value, Measurements, Recurring | Level 3 | Collateralized loan obligations (“CLOs”)    
Available-for-sale debt securities    
Fair Value $ 0 $ 0