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	Mar. 31, 2025	Dec. 31, 2024
Affordable housing partnership, tax credit and CRA investments, net:
Total affordable housing partnership, tax credit and CRA investments, net	$ 930,058	$ 926,640
Derivative assets:
Derivative assets - Fair value	513,897	523,133
Net derivative assets	184,334	95,841
Derivative liabilities - Fair value	464,084	545,885
Net derivative liabilities	363,357	433,601
Fair Value	12,384,912	10,846,811
Government National Mortgage Association (GNMA)
Derivative assets:
Fair Value	8,500,000	7,200,000
U.S. Treasury securities
Derivative assets:
Fair Value	930,981	638,265
U.S. government agency and U.S. government-sponsored enterprise debt securities
Derivative assets:
Fair Value	268,406	262,587
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Derivative assets:
Fair Value	418,550	426,214
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Derivative assets:
Fair Value	9,005,562	7,738,260
Municipal securities
Derivative assets:
Fair Value	245,854	250,153
Non-agency commercial mortgage-backed securities
Derivative assets:
Fair Value	236,600	258,470
Non-agency residential mortgage-backed securities
Derivative assets:
Fair Value	430,068	433,608
Corporate debt securities
Derivative assets:
Fair Value	536,542	526,166
Foreign government bonds
Derivative assets:
Fair Value	234,191	233,880
Asset-backed securities
Derivative assets:
Fair Value	33,735	34,715
Collateralized loan obligations (“CLOs”)
Derivative assets:
Fair Value	44,423	44,493
Fair Value, Measurements, Recurring
AFS debt securities:
Fair Value	12,384,912	10,846,811
Affordable housing partnership, tax credit and CRA investments, net:
Equity securities	25,515	25,021
Total affordable housing partnership, tax credit and CRA investments, net	25,515	25,021
Other assets:
Equity securities	630	568
Total other assets	630	568
Derivative assets:
Derivative assets - Fair value	513,897	523,133
Netting adjustments	(329,563)	(427,292)
Net derivative assets	184,334	95,841
Derivative liabilities - Fair value	464,084	545,885
Netting adjustments	(100,727)	(112,284)
Net derivative liabilities	363,357	433,601
Fair Value, Measurements, Recurring | Interest rate contracts
Derivative assets:
Derivative assets - Fair value	351,214	385,311
Derivative liabilities - Fair value	336,183	414,172
Fair Value, Measurements, Recurring | Foreign exchange contracts
Derivative assets:
Derivative assets - Fair value	39,381	89,083
Derivative liabilities - Fair value	30,901	71,254
Fair Value, Measurements, Recurring | Credit contracts
Derivative assets:
Derivative assets - Fair value	18	1
Derivative liabilities - Fair value	19	12
Fair Value, Measurements, Recurring | Equity contracts
Derivative assets:
Derivative assets - Fair value	418	239
Derivative liabilities - Fair value	15,119	15,119
Fair Value, Measurements, Recurring | Commodity contracts
Derivative assets:
Derivative assets - Fair value	122,866	48,499
Derivative liabilities - Fair value	81,862	45,328
Fair Value, Measurements, Recurring | U.S. Treasury securities
AFS debt securities:
Fair Value	930,981	638,265
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government-sponsored enterprise debt securities
AFS debt securities:
Fair Value	268,406	262,587
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
AFS debt securities:
Fair Value	418,550	426,214
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
AFS debt securities:
Fair Value	9,005,562	7,738,260
Fair Value, Measurements, Recurring | Municipal securities
AFS debt securities:
Fair Value	245,854	250,153
Fair Value, Measurements, Recurring | Non-agency commercial mortgage-backed securities
AFS debt securities:
Fair Value	236,600	258,470
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities
AFS debt securities:
Fair Value	430,068	433,608
Fair Value, Measurements, Recurring | Corporate debt securities
AFS debt securities:
Fair Value	536,542	526,166
Fair Value, Measurements, Recurring | Foreign government bonds
AFS debt securities:
Fair Value	234,191	233,880
Fair Value, Measurements, Recurring | Asset-backed securities
AFS debt securities:
Fair Value	33,735	34,715
Fair Value, Measurements, Recurring | Collateralized loan obligations (“CLOs”)
AFS debt securities:
Fair Value	44,423	44,493
Fair Value, Measurements, Recurring | Level 1
AFS debt securities:
Fair Value	930,981	638,265
Affordable housing partnership, tax credit and CRA investments, net:
Equity securities	21,280	20,817
Total affordable housing partnership, tax credit and CRA investments, net	21,280	20,817
Other assets:
Equity securities	630	568
Total other assets	630	568
Derivative assets:
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 assets:
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Level 1 | Foreign exchange contracts
Derivative assets:
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Level 1 | Credit contracts
Derivative assets:
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Level 1 | Equity contracts
Derivative assets:
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Level 1 | Commodity contracts
Derivative assets:
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury securities
AFS debt securities:
Fair Value	930,981	638,265
Fair Value, Measurements, Recurring | Level 1 | U.S. government agency and U.S. government-sponsored enterprise debt securities
AFS 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
AFS 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
AFS debt securities:
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | Municipal securities
AFS debt securities:
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | Non-agency commercial mortgage-backed securities
AFS debt securities:
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | Non-agency residential mortgage-backed securities
AFS debt securities:
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | Corporate debt securities
AFS debt securities:
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | Foreign government bonds
AFS debt securities:
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | Asset-backed securities
AFS debt securities:
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 1 | Collateralized loan obligations (“CLOs”)
AFS debt securities:
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 2
AFS debt securities:
Fair Value	11,453,931	10,208,546
Affordable housing partnership, tax credit and CRA investments, net:
Equity securities	4,235	4,204
Total affordable housing partnership, tax credit and CRA investments, net	4,235	4,204
Other assets:
Equity securities	0	0
Total other assets	0	0
Derivative assets:
Derivative assets - Fair value	513,479	522,894
Netting adjustments	(329,563)	(427,292)
Net derivative assets	183,916	95,602
Derivative liabilities - Fair value	448,965	530,766
Netting adjustments	(100,727)	(112,284)
Net derivative liabilities	348,238	418,482
Fair Value, Measurements, Recurring | Level 2 | Interest rate contracts
Derivative assets:
Derivative assets - Fair value	351,214	385,311
Derivative liabilities - Fair value	336,183	414,172
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange contracts
Derivative assets:
Derivative assets - Fair value	39,381	89,083
Derivative liabilities - Fair value	30,901	71,254
Fair Value, Measurements, Recurring | Level 2 | Credit contracts
Derivative assets:
Derivative assets - Fair value	18	1
Derivative liabilities - Fair value	19	12
Fair Value, Measurements, Recurring | Level 2 | Equity contracts
Derivative assets:
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Level 2 | Commodity contracts
Derivative assets:
Derivative assets - Fair value	122,866	48,499
Derivative liabilities - Fair value	81,862	45,328
Fair Value, Measurements, Recurring | Level 2 | U.S. Treasury securities
AFS debt securities:
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 2 | U.S. government agency and U.S. government-sponsored enterprise debt securities
AFS debt securities:
Fair Value	268,406	262,587
Fair Value, Measurements, Recurring | Level 2 | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
AFS debt securities:
Fair Value	418,550	426,214
Fair Value, Measurements, Recurring | Level 2 | U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
AFS debt securities:
Fair Value	9,005,562	7,738,260
Fair Value, Measurements, Recurring | Level 2 | Municipal securities
AFS debt securities:
Fair Value	245,854	250,153
Fair Value, Measurements, Recurring | Level 2 | Non-agency commercial mortgage-backed securities
AFS debt securities:
Fair Value	236,600	258,470
Fair Value, Measurements, Recurring | Level 2 | Non-agency residential mortgage-backed securities
AFS debt securities:
Fair Value	430,068	433,608
Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities
AFS debt securities:
Fair Value	536,542	526,166
Fair Value, Measurements, Recurring | Level 2 | Foreign government bonds
AFS debt securities:
Fair Value	234,191	233,880
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities
AFS debt securities:
Fair Value	33,735	34,715
Fair Value, Measurements, Recurring | Level 2 | Collateralized loan obligations (“CLOs”)
AFS debt securities:
Fair Value	44,423	44,493
Fair Value, Measurements, Recurring | Level 3
AFS 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	0
Total other assets	0	0
Derivative assets:
Derivative assets - Fair value	418	239
Netting adjustments	0	0
Net derivative assets	418	239
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 assets:
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Level 3 | Foreign exchange contracts
Derivative assets:
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Level 3 | Credit contracts
Derivative assets:
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Level 3 | Equity contracts
Derivative assets:
Derivative assets - Fair value	418	239
Derivative liabilities - Fair value	15,119	15,119
Fair Value, Measurements, Recurring | Level 3 | Commodity contracts
Derivative assets:
Derivative assets - Fair value	0	0
Derivative liabilities - Fair value	0	0
Fair Value, Measurements, Recurring | Level 3 | U.S. Treasury securities
AFS debt securities:
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | U.S. government agency and U.S. government-sponsored enterprise debt securities
AFS 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
AFS 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
AFS debt securities:
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | Municipal securities
AFS debt securities:
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | Non-agency commercial mortgage-backed securities
AFS debt securities:
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | Non-agency residential mortgage-backed securities
AFS debt securities:
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities
AFS debt securities:
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | Foreign government bonds
AFS debt securities:
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities
AFS debt securities:
Fair Value	0	0
Fair Value, Measurements, Recurring | Level 3 | Collateralized loan obligations (“CLOs”)
AFS debt securities:
Fair Value	$ 0	$ 0