Loans and Leases (Credit Quality Indicators) (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	$ 47,823,875	$ 22,271,729
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	8,301,896	3,902,968
Year two	5,964,414	2,337,777
Year three	3,873,994	2,272,548
Year four	3,866,963	1,772,381
Year five	2,699,870	796,050
Prior	6,015,057	1,829,351
Revolving Loans Amortized Cost Basis	7,751,378	2,268,891
Loans and leases	38,473,572	15,179,966
Commercial | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	4,204,756	2,288,196
Year two	2,147,604	1,249,399
Year three	1,192,547	825,657
Year four	922,222	667,171
Year five	758,472	307,613
Prior	923,995	310,671
Revolving Loans Amortized Cost Basis	4,998,911	1,233,773
Loans and leases	15,148,507	6,882,480
Commercial | Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	8,072	7,609
Year two	7,610	19,141
Year three	26,900	14,896
Year four	17,254	14,131
Year five	14,561	6,113
Prior	56,370	25,850
Revolving Loans Amortized Cost Basis	1,672,952	979,508
Loans and leases	1,803,719	1,067,248
Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	2,450,937	1,152,526
Year two	2,258,609	736,386
Year three	1,803,394	1,146,376
Year four	1,855,541	679,028
Year five	1,243,996	450,074
Prior	3,023,233	1,243,887
Revolving Loans Amortized Cost Basis	107,178	55,044
Loans and leases	12,742,888	5,463,321
Commercial | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,309,097	222,875
Year two	1,161,641	136,324
Year three	453,710	185,087
Year four	699,899	364,822
Year five	542,443	17,054
Prior	1,875,042	213,131
Revolving Loans Amortized Cost Basis	77,899	566
Loans and leases	6,119,731	1,139,859
Commercial | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	329,034	231,762
Year two	388,950	196,527
Year three	397,443	100,532
Year four	372,047	47,229
Year five	140,398	15,196
Prior	136,417	35,812
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	1,764,289	627,058
Commercial | Warehouse lending
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0
Year two	0
Year three	0
Year four	0
Year five	0
Prior	0
Revolving Loans Amortized Cost Basis	894,438
Loans and leases	894,438	0
Commercial | Pass | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	4,106,108	2,270,320
Year two	2,132,870	1,179,620
Year three	1,120,386	757,343
Year four	883,826	581,633
Year five	685,660	292,637
Prior	890,405	275,789
Revolving Loans Amortized Cost Basis	4,906,060	1,182,562
Loans and leases	14,725,315	6,539,904
Commercial | Pass | Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	8,072	7,609
Year two	7,610	19,141
Year three	16,883	12,810
Year four	15,729	13,456
Year five	14,561	6,113
Prior	56,370	25,850
Revolving Loans Amortized Cost Basis	1,563,434	920,496
Loans and leases	1,682,659	1,005,475
Commercial | Pass | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	2,428,963	1,152,431
Year two	2,248,840	733,220
Year three	1,760,942	1,146,149
Year four	1,803,958	594,180
Year five	1,128,337	384,664
Prior	2,873,117	1,136,384
Revolving Loans Amortized Cost Basis	107,178	55,044
Loans and leases	12,351,335	5,202,072
Commercial | Pass | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,309,097	222,875
Year two	1,123,973	135,924
Year three	453,324	185,087
Year four	698,885	322,688
Year five	489,177	17,054
Prior	1,843,835	203,558
Revolving Loans Amortized Cost Basis	68,623	566
Loans and leases	5,986,914	1,087,752
Commercial | Pass | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	328,553	231,762
Year two	382,901	188,031
Year three	378,176	93,547
Year four	364,598	41,276
Year five	127,688	14,864
Prior	126,879	32,588
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	1,708,795	602,068
Commercial | Pass | Warehouse lending
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0
Year two	0
Year three	0
Year four	0
Year five	0
Prior	0
Revolving Loans Amortized Cost Basis	894,438
Loans and leases	894,438
Commercial | Special mention | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	73,417	14,216
Year two	13,288	22,892
Year three	0	37,877
Year four	310	15,575
Year five	1,118	9,721
Prior	14,781	15,399
Revolving Loans Amortized Cost Basis	43,220	27,808
Loans and leases	146,134	143,488
Commercial | Special mention | Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	0	675
Year five	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	40,279	59,012
Loans and leases	40,279	59,687
Commercial | Special mention | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	21,974	95
Year two	8,267	3,084
Year three	33,548	0
Year four	22,300	84,475
Year five	91,283	51,536
Prior	60,346	79,096
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	237,718	218,286
Commercial | Special mention | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	37,668	0
Year three	0	0
Year four	95	35,201
Year five	40,506	0
Prior	9,915	0
Revolving Loans Amortized Cost Basis	9,276	0
Loans and leases	97,460	35,201
Commercial | Special mention | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	195	108
Year three	573	2,229
Year four	1,691	3,341
Year five	6,826	0
Prior	1,128	600
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	10,413	6,278
Commercial | Substandard | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	25,231	3,660
Year two	1,442	46,887
Year three	72,161	30,437
Year four	38,086	69,963
Year five	71,694	5,255
Prior	18,809	19,483
Revolving Loans Amortized Cost Basis	46,113	23,403
Loans and leases	273,536	199,088
Commercial | Substandard | Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	10,017	2,086
Year four	1,525	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	69,239	0
Loans and leases	80,781	2,086
Commercial | Substandard | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	1,502	82
Year three	8,904	227
Year four	29,282	373
Year five	24,376	13,874
Prior	89,736	28,407
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	153,800	42,963
Commercial | Substandard | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	400
Year three	386	0
Year four	919	6,933
Year five	12,760	0
Prior	21,292	9,573
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	35,357	16,906
Commercial | Substandard | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	481	0
Year two	5,854	8,388
Year three	18,694	4,756
Year four	5,758	2,612
Year five	5,884	332
Prior	8,410	2,624
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	45,081	18,712
Commercial | Doubtful | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0
Year two	4
Year three	0
Year four	0
Year five	0
Prior	0
Revolving Loans Amortized Cost Basis	3,518
Loans and leases	3,522
Commercial | Doubtful | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0
Year two	0
Year three	0
Year four	1
Year five	0
Prior	34
Revolving Loans Amortized Cost Basis	0
Loans and leases	35
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,531,124	2,198,697
Year two	2,425,617	1,077,624
Year three	980,280	502,707
Year four	443,293	144,883
Year five	131,240	274,746
Prior	2,538,455	1,669,802
Revolving Loans Amortized Cost Basis	1,300,294	1,223,304
Loans and leases	9,350,303	7,091,763
Consumer | Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,472,561	2,096,428
Year two	2,328,255	999,477
Year three	917,348	448,723
Year four	410,287	96,219
Year five	96,054	246,929
Prior	2,393,450	1,525,129
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	7,617,955	5,412,905
Consumer | Residential | 800+
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	334,705	590,238
Year two	911,161	428,118
Year three	449,160	161,664
Year four	161,434	35,502
Year five	33,136	105,198
Prior	1,006,403	735,517
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	2,895,999	2,056,237
Consumer | Residential | 740-799
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	786,495	1,083,608
Year two	1,008,396	421,380
Year three	336,307	154,960
Year four	119,615	32,172
Year five	39,329	95,662
Prior	769,948	456,722
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	3,060,090	2,244,504
Consumer | Residential | 670 to 739
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	308,253	374,460
Year two	359,002	135,146
Year three	115,708	73,499
Year four	59,946	25,099
Year five	18,853	34,550
Prior	407,928	227,863
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	1,269,690	870,617
Consumer | Residential | 580-669
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	32,779	38,644
Year two	44,896	13,782
Year three	14,772	9,348
Year four	8,598	3,056
Year five	3,283	9,000
Prior	150,773	71,811
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	255,101	145,641
Consumer | Residential | 579 and below
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	10,329	9,478
Year two	4,800	1,051
Year three	1,401	49,252
Year four	60,694	390
Year five	1,453	2,519
Prior	58,398	33,216
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	137,075	95,906
Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	56,511	97,754
Year two	93,258	63,192
Year three	55,667	26,916
Year four	22,050	40,010
Year five	31,614	26,344
Prior	143,624	143,834
Revolving Loans Amortized Cost Basis	1,260,032	1,195,509
Loans and leases	1,662,756	1,593,559
Consumer | Home equity | 800+
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	19,190	35,678
Year two	34,258	30,157
Year three	27,296	9,591
Year four	8,379	16,347
Year five	12,193	11,068
Prior	55,519	58,189
Revolving Loans Amortized Cost Basis	482,328	463,334
Loans and leases	639,163	624,364
Consumer | Home equity | 740-799
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	21,246	42,430
Year two	37,099	22,030
Year three	18,237	9,413
Year four	7,772	13,317
Year five	10,382	7,711
Prior	36,451	33,777
Revolving Loans Amortized Cost Basis	417,840	409,518
Loans and leases	549,027	538,196
Consumer | Home equity | 670 to 739
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	13,616	17,493
Year two	18,679	9,162
Year three	8,092	5,889
Year four	3,693	8,220
Year five	7,218	5,802
Prior	33,343	31,160
Revolving Loans Amortized Cost Basis	256,835	233,744
Loans and leases	341,476	311,470
Consumer | Home equity | 580-669
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	2,016	1,773
Year two	2,832	1,397
Year three	1,383	1,298
Year four	1,616	1,066
Year five	1,114	1,329
Prior	13,264	15,042
Revolving Loans Amortized Cost Basis	75,542	66,361
Loans and leases	97,767	88,266
Consumer | Home equity | 579 and below
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	443	380
Year two	390	446
Year three	659	725
Year four	590	1,060
Year five	707	434
Prior	5,047	5,666
Revolving Loans Amortized Cost Basis	27,487	22,552
Loans and leases	35,323	31,263
Consumer | Consumer Loan
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	2,052	4,515
Year two	4,104	14,955
Year three	7,265	27,068
Year four	10,956	8,654
Year five	3,572	1,473
Prior	1,381	839
Revolving Loans Amortized Cost Basis	40,262	27,795
Loans and leases	69,592	85,299
Consumer | Consumer Loan | 800+
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	363	463
Year two	246	1,343
Year three	783	2,398
Year four	1,229	916
Year five	425	231
Prior	108	118
Revolving Loans Amortized Cost Basis	21,121	10,160
Loans and leases	24,275	15,629
Consumer | Consumer Loan | 740-799
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	646	2,588
Year two	2,761	5,408
Year three	2,544	8,303
Year four	3,227	2,985
Year five	1,287	379
Prior	889	77
Revolving Loans Amortized Cost Basis	10,816	9,528
Loans and leases	22,170	29,268
Consumer | Consumer Loan | 670 to 739
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	820	1,061
Year two	770	7,034
Year three	3,404	13,602
Year four	5,281	3,859
Year five	1,535	607
Prior	281	412
Revolving Loans Amortized Cost Basis	5,321	5,644
Loans and leases	17,412	32,219
Consumer | Consumer Loan | 580-669
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	169	256
Year two	211	1,083
Year three	424	2,550
Year four	1,019	735
Year five	263	216
Prior	72	211
Revolving Loans Amortized Cost Basis	1,560	1,267
Loans and leases	3,718	6,318
Consumer | Consumer Loan | 579 and below
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	54	147
Year two	116	87
Year three	110	215
Year four	200	159
Year five	62	40
Prior	31	21
Revolving Loans Amortized Cost Basis	1,444	1,196
Loans and leases	$ 2,017	$ 1,865