Loans and Leases - Amortized Cost Basis by Risk Rating (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Financing Receivable
Loans and leases	$ 53,056,223		$ 52,505,168
Current period gross write-offs
Total	56,618	$ 39,791
Commercial portfolio
Financing Receivable
Total financing receivable, Current fiscal year	1,297,528		5,840,676
Total financing receivable, Fiscal year before current fiscal year	5,766,653		6,270,657
Total financing receivable, Two years before current fiscal year	6,144,169		8,293,790
Total financing receivable, Three years before current fiscal year	7,895,495		3,916,614
Total financing receivable, Four years before current fiscal year	3,796,856		2,136,587
Total financing receivable, More than five years before current fiscal year	9,083,560		7,445,782
Revolving Loans Amortized Cost Basis	8,279,709		8,163,895
Loans and leases	42,263,970		42,068,001
Current period gross write-offs
Current fiscal year	0		0
Fiscal year before current fiscal year	959		17,894
Two years before current fiscal year	19,560		48,257
Three years before current fiscal year	5,998		17,254
Four years before current fiscal year	450		25,583
More than five years before current fiscal year	5,867		41,212
Revolving Loans Amortized Cost Basis	22,732		21,260
Total	55,566	$ 38,461	171,460
Commercial portfolio | Commercial non-mortgage
Financing Receivable
Total financing receivable, Current fiscal year	590,307		3,004,942
Total financing receivable, Fiscal year before current fiscal year	2,867,252		2,109,410
Total financing receivable, Two years before current fiscal year	2,052,093		3,212,637
Total financing receivable, Three years before current fiscal year	2,997,392		1,243,765
Total financing receivable, Four years before current fiscal year	1,265,293		609,387
Total financing receivable, More than five years before current fiscal year	1,779,930		1,279,538
Revolving Loans Amortized Cost Basis	6,714,430		6,578,263
Loans and leases	18,266,697		18,037,942
Current period gross write-offs
Current fiscal year	0		0
Fiscal year before current fiscal year	959		11,894
Two years before current fiscal year	5,507		45,308
Three years before current fiscal year	5,742		10,668
Four years before current fiscal year	35		3,842
More than five years before current fiscal year	3,109		3,385
Revolving Loans Amortized Cost Basis	12,677		15,169
Total	28,029		90,266
Commercial portfolio | Asset-based
Financing Receivable
Total financing receivable, Current fiscal year	9,620		1,250
Total financing receivable, Fiscal year before current fiscal year	1,237		14,246
Total financing receivable, Two years before current fiscal year	13,310		0
Total financing receivable, Three years before current fiscal year	0		0
Total financing receivable, Four years before current fiscal year	0		0
Total financing receivable, More than five years before current fiscal year	25,699		26,720
Revolving Loans Amortized Cost Basis	1,335,176		1,361,791
Loans and leases	1,385,042		1,404,007
Current period gross write-offs
Current fiscal year	0		0
Fiscal year before current fiscal year	0		0
Two years before current fiscal year	0		0
Three years before current fiscal year	0		0
Four years before current fiscal year	0		0
More than five years before current fiscal year	0		0
Revolving Loans Amortized Cost Basis	10,055		6,091
Total	10,055		6,091
Commercial portfolio | Commercial real estate
Financing Receivable
Total financing receivable, Current fiscal year	581,951		1,867,468
Total financing receivable, Fiscal year before current fiscal year	1,944,151		2,478,882
Total financing receivable, Two years before current fiscal year	2,464,747		3,431,179
Total financing receivable, Three years before current fiscal year	3,153,514		1,621,260
Total financing receivable, Four years before current fiscal year	1,497,852		1,094,418
Total financing receivable, More than five years before current fiscal year	4,631,430		3,792,379
Revolving Loans Amortized Cost Basis	213,103		206,850
Loans and leases	14,486,748		14,492,436
Current period gross write-offs
Current fiscal year	0		0
Fiscal year before current fiscal year	0		854
Two years before current fiscal year	13,986		1,244
Three years before current fiscal year	256		1,579
Four years before current fiscal year	406		15,477
More than five years before current fiscal year	2,583		22,674
Revolving Loans Amortized Cost Basis	0		0
Total	17,231		41,828
Commercial portfolio | Multi-family
Financing Receivable
Total financing receivable, Current fiscal year	22,763		582,363
Total financing receivable, Fiscal year before current fiscal year	586,211		1,409,220
Total financing receivable, Two years before current fiscal year	1,370,874		1,424,552
Total financing receivable, Three years before current fiscal year	1,534,496		908,165
Total financing receivable, Four years before current fiscal year	909,459		343,430
Total financing receivable, More than five years before current fiscal year	2,455,593		2,213,879
Revolving Loans Amortized Cost Basis	17,000		16,991
Loans and leases	6,896,396		6,898,600
Current period gross write-offs
Current fiscal year	0		0
Fiscal year before current fiscal year	0		0
Two years before current fiscal year	0		0
Three years before current fiscal year	0		4,955
Four years before current fiscal year	0		6,264
More than five years before current fiscal year	175		11,678
Revolving Loans Amortized Cost Basis	0		0
Total	175		22,897
Commercial portfolio | Equipment financing
Financing Receivable
Total financing receivable, Current fiscal year	92,887		384,653
Total financing receivable, Fiscal year before current fiscal year	367,802		258,899
Total financing receivable, Two years before current fiscal year	243,145		225,422
Total financing receivable, Three years before current fiscal year	210,093		143,424
Total financing receivable, Four years before current fiscal year	124,252		89,352
Total financing receivable, More than five years before current fiscal year	190,908		133,266
Revolving Loans Amortized Cost Basis	0		0
Loans and leases	1,229,087		1,235,016
Current period gross write-offs
Current fiscal year	0		0
Fiscal year before current fiscal year	0		5,146
Two years before current fiscal year	67		1,705
Three years before current fiscal year	0		52
Four years before current fiscal year	9		0
More than five years before current fiscal year	0		3,475
Revolving Loans Amortized Cost Basis	0		0
Total	76		10,378
Pass | Commercial portfolio | Commercial non-mortgage
Financing Receivable
Total financing receivable, Current fiscal year	589,610		2,917,048
Total financing receivable, Fiscal year before current fiscal year	2,811,820		1,916,905
Total financing receivable, Two years before current fiscal year	1,849,511		2,818,720
Total financing receivable, Three years before current fiscal year	2,610,552		1,100,575
Total financing receivable, Four years before current fiscal year	1,122,264		562,252
Total financing receivable, More than five years before current fiscal year	1,671,176		1,211,312
Revolving Loans Amortized Cost Basis	6,505,435		6,325,637
Loans and leases	17,160,368		16,852,449
Pass | Commercial portfolio | Asset-based
Financing Receivable
Total financing receivable, Current fiscal year	8,000		1,250
Total financing receivable, Fiscal year before current fiscal year	1,237		11,684
Total financing receivable, Two years before current fiscal year	10,775		0
Total financing receivable, Three years before current fiscal year	0		0
Total financing receivable, Four years before current fiscal year	0		0
Total financing receivable, More than five years before current fiscal year	19,726		20,255
Revolving Loans Amortized Cost Basis	1,105,821		1,132,901
Loans and leases	1,145,559		1,166,090
Pass | Commercial portfolio | Commercial real estate
Financing Receivable
Total financing receivable, Current fiscal year	581,951		1,867,468
Total financing receivable, Fiscal year before current fiscal year	1,942,913		2,334,965
Total financing receivable, Two years before current fiscal year	2,302,313		3,186,098
Total financing receivable, Three years before current fiscal year	2,933,804		1,462,814
Total financing receivable, Four years before current fiscal year	1,343,779		944,367
Total financing receivable, More than five years before current fiscal year	4,179,679		3,465,817
Revolving Loans Amortized Cost Basis	204,251		197,998
Loans and leases	13,488,690		13,459,527
Pass | Commercial portfolio | Multi-family
Financing Receivable
Total financing receivable, Current fiscal year	22,763		582,363
Total financing receivable, Fiscal year before current fiscal year	586,211		1,394,855
Total financing receivable, Two years before current fiscal year	1,356,553		1,314,395
Total financing receivable, Three years before current fiscal year	1,402,923		862,273
Total financing receivable, Four years before current fiscal year	859,681		245,802
Total financing receivable, More than five years before current fiscal year	2,270,701		2,179,207
Revolving Loans Amortized Cost Basis	17,000		16,991
Loans and leases	6,515,832		6,595,886
Pass | Commercial portfolio | Equipment financing
Financing Receivable
Total financing receivable, Current fiscal year	92,887		382,783
Total financing receivable, Fiscal year before current fiscal year	366,019		242,440
Total financing receivable, Two years before current fiscal year	223,425		207,081
Total financing receivable, Three years before current fiscal year	190,593		126,399
Total financing receivable, Four years before current fiscal year	108,200		83,838
Total financing receivable, More than five years before current fiscal year	180,836		124,910
Revolving Loans Amortized Cost Basis	0		0
Loans and leases	1,161,960		1,167,451
Special mention | Commercial portfolio | Commercial non-mortgage
Financing Receivable
Total financing receivable, Current fiscal year	0		31,587
Total financing receivable, Fiscal year before current fiscal year	31,408		66,770
Total financing receivable, Two years before current fiscal year	53,061		156,555
Total financing receivable, Three years before current fiscal year	101,730		51,055
Total financing receivable, Four years before current fiscal year	50,937		30,669
Total financing receivable, More than five years before current fiscal year	30,667		4,203
Revolving Loans Amortized Cost Basis	39,155		44,017
Loans and leases	306,958		384,856
Special mention | Commercial portfolio | Asset-based
Financing Receivable
Total financing receivable, Current fiscal year	1,620		0
Total financing receivable, Fiscal year before current fiscal year	0		0
Total financing receivable, Two years before current fiscal year	0		0
Total financing receivable, Three years before current fiscal year	0		0
Total financing receivable, Four years before current fiscal year	0		0
Total financing receivable, More than five years before current fiscal year	5,021		5,226
Revolving Loans Amortized Cost Basis	43,938		90,372
Loans and leases	50,579		95,598
Special mention | Commercial portfolio | Commercial real estate
Financing Receivable
Total financing receivable, Current fiscal year	0		0
Total financing receivable, Fiscal year before current fiscal year	0		12,809
Total financing receivable, Two years before current fiscal year	43,961		175,252
Total financing receivable, Three years before current fiscal year	151,332		37,307
Total financing receivable, Four years before current fiscal year	0		37,469
Total financing receivable, More than five years before current fiscal year	71,182		64,483
Revolving Loans Amortized Cost Basis	0		0
Loans and leases	266,475		327,320
Special mention | Commercial portfolio | Multi-family
Financing Receivable
Total financing receivable, Current fiscal year	0		0
Total financing receivable, Fiscal year before current fiscal year	0		14,365
Total financing receivable, Two years before current fiscal year	0		93,396
Total financing receivable, Three years before current fiscal year	114,846		18,790
Total financing receivable, Four years before current fiscal year	22,751		70,908
Total financing receivable, More than five years before current fiscal year	105,953		8,588
Revolving Loans Amortized Cost Basis	0		0
Loans and leases	243,550		206,047
Special mention | Commercial portfolio | Equipment financing
Financing Receivable
Total financing receivable, Current fiscal year	0		1,298
Total financing receivable, Fiscal year before current fiscal year	1,242		231
Total financing receivable, Two years before current fiscal year	5,251		0
Total financing receivable, Three years before current fiscal year	0		55
Total financing receivable, Four years before current fiscal year	49		0
Total financing receivable, More than five years before current fiscal year	0		0
Revolving Loans Amortized Cost Basis	0		0
Loans and leases	6,542		1,584
Substandard | Commercial portfolio | Commercial non-mortgage
Financing Receivable
Total financing receivable, Current fiscal year	697		56,307
Total financing receivable, Fiscal year before current fiscal year	24,024		125,735
Total financing receivable, Two years before current fiscal year	149,521		237,362
Total financing receivable, Three years before current fiscal year	285,110		92,134
Total financing receivable, Four years before current fiscal year	92,091		16,466
Total financing receivable, More than five years before current fiscal year	78,062		63,998
Revolving Loans Amortized Cost Basis	169,839		208,608
Loans and leases	799,344		800,610
Substandard | Commercial portfolio | Asset-based
Financing Receivable
Total financing receivable, Current fiscal year	0		0
Total financing receivable, Fiscal year before current fiscal year	0		2,562
Total financing receivable, Two years before current fiscal year	2,535		0
Total financing receivable, Three years before current fiscal year	0		0
Total financing receivable, Four years before current fiscal year	0		0
Total financing receivable, More than five years before current fiscal year	952		1,239
Revolving Loans Amortized Cost Basis	185,417		138,518
Loans and leases	188,904		142,319
Substandard | Commercial portfolio | Commercial real estate
Financing Receivable
Total financing receivable, Current fiscal year	0		0
Total financing receivable, Fiscal year before current fiscal year	1,238		131,108
Total financing receivable, Two years before current fiscal year	118,473		69,829
Total financing receivable, Three years before current fiscal year	68,378		121,139
Total financing receivable, Four years before current fiscal year	154,073		112,582
Total financing receivable, More than five years before current fiscal year	380,569		262,079
Revolving Loans Amortized Cost Basis	8,852		8,852
Loans and leases	731,583		705,589
Substandard | Commercial portfolio | Multi-family
Financing Receivable
Total financing receivable, Current fiscal year	0		0
Total financing receivable, Fiscal year before current fiscal year	0		0
Total financing receivable, Two years before current fiscal year	14,321		16,761
Total financing receivable, Three years before current fiscal year	16,727		27,102
Total financing receivable, Four years before current fiscal year	27,027		26,720
Total financing receivable, More than five years before current fiscal year	78,939		26,084
Revolving Loans Amortized Cost Basis	0		0
Loans and leases	137,014		96,667
Substandard | Commercial portfolio | Equipment financing
Financing Receivable
Total financing receivable, Current fiscal year	0		572
Total financing receivable, Fiscal year before current fiscal year	541		16,228
Total financing receivable, Two years before current fiscal year	14,469		18,341
Total financing receivable, Three years before current fiscal year	19,500		16,970
Total financing receivable, Four years before current fiscal year	16,003		5,514
Total financing receivable, More than five years before current fiscal year	10,072		8,356
Revolving Loans Amortized Cost Basis	0		0
Loans and leases	60,585		65,981
Doubtful | Commercial portfolio | Commercial non-mortgage
Financing Receivable
Total financing receivable, Current fiscal year	0		0
Total financing receivable, Fiscal year before current fiscal year	0		0
Total financing receivable, Two years before current fiscal year	0		0
Total financing receivable, Three years before current fiscal year	0		1
Total financing receivable, Four years before current fiscal year	1		0
Total financing receivable, More than five years before current fiscal year	25		25
Revolving Loans Amortized Cost Basis	1		1
Loans and leases	$ 27		$ 27