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	Jun. 30, 2025	Dec. 31, 2024
Affordable housing partnership, tax credit and CRA investments, net:
Total affordable housing partnership, tax credit and CRA investments, net	$ 968,389	$ 926,640
Derivative assets:
Derivative assets - Fair value	468,056	523,133
Net derivative assets	154,724	95,841
Derivative liabilities - Fair value	436,446	545,885
Net derivative liabilities	295,179	433,601
Fair Value	12,488,913	10,846,811
Government National Mortgage Association (GNMA)
Derivative assets:
Fair Value	8,900,000	7,200,000
U.S. Treasury securities
Derivative assets:
Fair Value	731,062	638,265
U.S. government agency and U.S. government-sponsored enterprise debt securities
Derivative assets:
Fair Value	270,292	262,587
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Derivative assets:
Fair Value	375,165	426,214
U.S. government agency and U.S. government-sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Derivative assets:
Fair Value	9,389,745	7,738,260
Municipal securities
Derivative assets:
Fair Value	239,197	250,153
Non-agency commercial mortgage-backed securities
Derivative assets:
Fair Value	224,596	258,470
Non-agency residential mortgage-backed securities
Derivative assets:
Fair Value	411,734	433,608
Corporate debt securities
Derivative assets:
Fair Value	534,644	526,166
Foreign government bonds
Derivative assets:
Fair Value	235,343	233,880
Asset-backed securities
Derivative assets:
Fair Value	32,643	34,715
Collateralized loan obligations (“CLOs”)
Derivative assets:
Fair Value	44,492	44,493
Fair Value, Measurements, Recurring
AFS debt securities:
Fair Value	12,488,913	10,846,811
Affordable housing partnership, tax credit and CRA investments, net:
Equity securities	25,769	25,021
Total affordable housing partnership, tax credit and CRA investments, net	25,769	25,021
Other assets:
Equity securities	638	568
Total other assets	638	568
Derivative assets:
Derivative assets - Fair value	468,056	523,133
Netting adjustments	(313,332)	(427,292)
Net derivative assets	154,724	95,841
Derivative liabilities - Fair value	436,446	545,885
Netting adjustments	(141,267)	(112,284)
Net derivative liabilities	295,179	433,601
Fair Value, Measurements, Recurring | Interest rate contracts
Derivative assets:
Derivative assets - Fair value	332,718	385,311
Derivative liabilities - Fair value	294,142	414,172
Fair Value, Measurements, Recurring | Foreign exchange contracts
Derivative assets:
Derivative assets - Fair value	68,807	89,083
Derivative liabilities - Fair value	63,162	71,254
Fair Value, Measurements, Recurring | Credit contracts
Derivative assets:
Derivative assets - Fair value	17	1
Derivative liabilities - Fair value	31	12
Fair Value, Measurements, Recurring | Equity contracts
Derivative assets:
Derivative assets - Fair value	377	239
Derivative liabilities - Fair value	15,119	15,119
Fair Value, Measurements, Recurring | Commodity contracts
Derivative assets:
Derivative assets - Fair value	66,137	48,499
Derivative liabilities - Fair value	63,992	45,328
Fair Value, Measurements, Recurring | U.S. Treasury securities
AFS debt securities:
Fair Value	731,062	638,265
Fair Value, Measurements, Recurring | U.S. government agency and U.S. government-sponsored enterprise debt securities
AFS debt securities:
Fair Value	270,292	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	375,165	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	9,389,745	7,738,260
Fair Value, Measurements, Recurring | Municipal securities
AFS debt securities:
Fair Value	239,197	250,153
Fair Value, Measurements, Recurring | Non-agency commercial mortgage-backed securities
AFS debt securities:
Fair Value	224,596	258,470
Fair Value, Measurements, Recurring | Non-agency residential mortgage-backed securities
AFS debt securities:
Fair Value	411,734	433,608
Fair Value, Measurements, Recurring | Corporate debt securities
AFS debt securities:
Fair Value	534,644	526,166
Fair Value, Measurements, Recurring | Foreign government bonds
AFS debt securities:
Fair Value	235,343	233,880
Fair Value, Measurements, Recurring | Asset-backed securities
AFS debt securities:
Fair Value	32,643	34,715
Fair Value, Measurements, Recurring | Collateralized loan obligations (“CLOs”)
AFS debt securities:
Fair Value	44,492	44,493
Fair Value, Measurements, Recurring | Level 1
AFS debt securities:
Fair Value	731,062	638,265
Affordable housing partnership, tax credit and CRA investments, net:
Equity securities	21,488	20,817
Total affordable housing partnership, tax credit and CRA investments, net	21,488	20,817
Other assets:
Equity securities	638	568
Total other assets	638	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	731,062	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	11,757,851	10,208,546
Affordable housing partnership, tax credit and CRA investments, net:
Equity securities	4,281	4,204
Total affordable housing partnership, tax credit and CRA investments, net	4,281	4,204
Other assets:
Equity securities	0	0
Total other assets	0	0
Derivative assets:
Derivative assets - Fair value	467,679	522,894
Netting adjustments	(313,332)	(427,292)
Net derivative assets	154,347	95,602
Derivative liabilities - Fair value	421,327	530,766
Netting adjustments	(141,267)	(112,284)
Net derivative liabilities	280,060	418,482
Fair Value, Measurements, Recurring | Level 2 | Interest rate contracts
Derivative assets:
Derivative assets - Fair value	332,718	385,311
Derivative liabilities - Fair value	294,142	414,172
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange contracts
Derivative assets:
Derivative assets - Fair value	68,807	89,083
Derivative liabilities - Fair value	63,162	71,254
Fair Value, Measurements, Recurring | Level 2 | Credit contracts
Derivative assets:
Derivative assets - Fair value	17	1
Derivative liabilities - Fair value	31	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	66,137	48,499
Derivative liabilities - Fair value	63,992	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	270,292	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	375,165	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	9,389,745	7,738,260
Fair Value, Measurements, Recurring | Level 2 | Municipal securities
AFS debt securities:
Fair Value	239,197	250,153
Fair Value, Measurements, Recurring | Level 2 | Non-agency commercial mortgage-backed securities
AFS debt securities:
Fair Value	224,596	258,470
Fair Value, Measurements, Recurring | Level 2 | Non-agency residential mortgage-backed securities
AFS debt securities:
Fair Value	411,734	433,608
Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities
AFS debt securities:
Fair Value	534,644	526,166
Fair Value, Measurements, Recurring | Level 2 | Foreign government bonds
AFS debt securities:
Fair Value	235,343	233,880
Fair Value, Measurements, Recurring | Level 2 | Asset-backed securities
AFS debt securities:
Fair Value	32,643	34,715
Fair Value, Measurements, Recurring | Level 2 | Collateralized loan obligations (“CLOs”)
AFS debt securities:
Fair Value	44,492	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	377	239
Netting adjustments	0	0
Net derivative assets	377	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	377	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