Loans and Leases (Credit Quality Indicators) (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases	$ 43,536,485	$ 22,271,729
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	2,195,678	3,902,968
Year two	6,666,033	2,337,777
Year three	4,624,209	2,272,548
Year four	4,875,300	1,772,381
Year five	3,167,886	796,050
Prior	6,844,013	1,829,351
Revolving Loans Amortized Cost Basis	6,597,967	2,268,891
Loans and leases	34,971,086	15,179,966
Commercial | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,184,061	2,288,196
Year two	2,743,735	1,249,399
Year three	1,661,980	825,657
Year four	1,226,960	667,171
Year five	899,843	307,613
Prior	1,111,561	310,671
Revolving Loans Amortized Cost Basis	4,277,033	1,233,773
Loans and leases	13,105,173	6,882,480
Commercial | Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	7,609
Year two	1,585	19,141
Year three	16,334	14,896
Year four	9,697	14,131
Year five	2,589	6,113
Prior	20,543	25,850
Revolving Loans Amortized Cost Basis	1,756,797	979,508
Loans and leases	1,807,545	1,067,248
Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	569,707	1,152,526
Year two	2,301,510	736,386
Year three	1,902,077	1,146,376
Year four	2,364,282	679,028
Year five	1,468,963	450,074
Prior	3,351,208	1,243,887
Revolving Loans Amortized Cost Basis	0	55,044
Loans and leases	11,957,747	5,463,321
Commercial | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	353,825	222,875
Year two	1,154,643	136,324
Year three	526,560	185,087
Year four	812,282	364,822
Year five	608,703	17,054
Prior	2,171,187	213,131
Revolving Loans Amortized Cost Basis	0	566
Loans and leases	5,627,200	1,139,859
Commercial | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	88,085	231,762
Year two	464,560	196,527
Year three	517,258	100,532
Year four	462,079	47,229
Year five	187,788	15,196
Prior	189,514	35,812
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	1,909,284	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	564,137
Loans and leases	564,137	0
Commercial | Pass | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,184,061	2,270,320
Year two	2,726,171	1,179,620
Year three	1,570,383	757,343
Year four	1,173,542	581,633
Year five	781,857	292,637
Prior	1,071,677	275,789
Revolving Loans Amortized Cost Basis	4,211,772	1,182,562
Loans and leases	12,719,463	6,539,904
Commercial | Pass | Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	7,609
Year two	1,585	19,141
Year three	4,737	12,810
Year four	9,697	13,456
Year five	2,589	6,113
Prior	20,543	25,850
Revolving Loans Amortized Cost Basis	1,676,341	920,496
Loans and leases	1,715,492	1,005,475
Commercial | Pass | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	480,774	1,152,431
Year two	2,300,007	733,220
Year three	1,862,529	1,146,149
Year four	2,271,370	594,180
Year five	1,324,793	384,664
Prior	3,092,728	1,136,384
Revolving Loans Amortized Cost Basis	0	55,044
Loans and leases	11,332,201	5,202,072
Commercial | Pass | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	353,825	222,875
Year two	1,154,643	135,924
Year three	526,163	185,087
Year four	790,407	322,688
Year five	555,600	17,054
Prior	2,107,897	203,558
Revolving Loans Amortized Cost Basis	0	566
Loans and leases	5,488,535	1,087,752
Commercial | Pass | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	87,396	231,762
Year two	460,154	188,031
Year three	498,215	93,547
Year four	450,145	41,276
Year five	171,362	14,864
Prior	176,105	32,588
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	1,843,377	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	564,137
Loans and leases	564,137
Commercial | Special mention | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	14,216
Year two	13,405	22,892
Year three	0	37,877
Year four	405	15,575
Year five	27,790	9,721
Prior	15,491	15,399
Revolving Loans Amortized Cost Basis	23,979	27,808
Loans and leases	81,070	143,488
Commercial | Special mention | Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	11,597	0
Year four	0	675
Year five	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	40,953	59,012
Loans and leases	52,550	59,687
Commercial | Special mention | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	87,287	95
Year two	0	3,084
Year three	33,796	0
Year four	46,723	84,475
Year five	75,725	51,536
Prior	109,753	79,096
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	353,284	218,286
Commercial | Special mention | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	0
Year four	5,223	35,201
Year five	46,200	0
Prior	32,374	0
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	83,797	35,201
Commercial | Special mention | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	108
Year three	1,042	2,229
Year four	4,132	3,341
Year five	11,208	0
Prior	4,929	600
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	21,311	6,278
Commercial | Substandard | Commercial non-mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	3,660
Year two	4,159	46,887
Year three	91,597	30,437
Year four	53,013	69,963
Year five	90,196	5,255
Prior	24,393	19,483
Revolving Loans Amortized Cost Basis	37,425	23,403
Loans and leases	300,783	199,088
Commercial | Substandard | Asset-based
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	0
Year three	0	2,086
Year four	0	0
Year five	0	0
Prior	0	0
Revolving Loans Amortized Cost Basis	39,503	0
Loans and leases	39,503	2,086
Commercial | Substandard | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	1,646	0
Year two	1,503	82
Year three	5,752	227
Year four	46,189	373
Year five	68,445	13,874
Prior	148,727	28,407
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	272,262	42,963
Commercial | Substandard | Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	0
Year two	0	400
Year three	397	0
Year four	16,652	6,933
Year five	6,903	0
Prior	30,916	9,573
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	54,868	16,906
Commercial | Substandard | Equipment financing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	689	0
Year two	4,406	8,388
Year three	18,001	4,756
Year four	7,802	2,612
Year five	5,218	332
Prior	8,480	2,624
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	44,596	18,712
Commercial | Doubtful | Commercial non-mortgage
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	3,857
Loans and leases	3,857
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	309,351	2,198,697
Year two	2,463,827	1,077,624
Year three	1,034,953	502,707
Year four	469,464	144,883
Year five	148,089	274,746
Prior	2,819,716	1,669,802
Revolving Loans Amortized Cost Basis	1,319,999	1,223,304
Loans and leases	8,565,399	7,091,763
Consumer | Residential
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	286,635	2,096,428
Year two	2,363,613	999,477
Year three	963,321	448,723
Year four	425,296	96,219
Year five	106,341	246,929
Prior	2,652,993	1,525,129
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	6,798,199	5,412,905
Consumer | Residential | 800+
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	39,359	590,238
Year two	797,341	428,118
Year three	450,236	161,664
Year four	159,820	35,502
Year five	32,779	105,198
Prior	988,591	735,517
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	2,468,126	2,056,237
Consumer | Residential | 740-799
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	179,363	1,083,608
Year two	1,150,417	421,380
Year three	371,094	154,960
Year four	141,957	32,172
Year five	41,325	95,662
Prior	904,628	456,722
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	2,788,784	2,244,504
Consumer | Residential | 670 to 739
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	63,399	374,460
Year two	371,717	135,146
Year three	122,158	73,499
Year four	66,514	25,099
Year five	26,780	34,550
Prior	483,134	227,863
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	1,133,702	870,617
Consumer | Residential | 580-669
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	3,646	38,644
Year two	41,718	13,782
Year three	18,238	9,348
Year four	9,163	3,056
Year five	4,729	9,000
Prior	197,165	71,811
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	274,659	145,641
Consumer | Residential | 579 and below
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	868	9,478
Year two	2,420	1,051
Year three	1,595	49,252
Year four	47,842	390
Year five	728	2,519
Prior	79,475	33,216
Revolving Loans Amortized Cost Basis	0	0
Loans and leases	132,928	95,906
Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	22,412	97,754
Year two	97,871	63,192
Year three	59,926	26,916
Year four	24,785	40,010
Year five	35,290	26,344
Prior	160,584	143,834
Revolving Loans Amortized Cost Basis	1,278,575	1,195,509
Loans and leases	1,679,443	1,593,559
Consumer | Home equity | 800+
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	9,110	35,678
Year two	34,957	30,157
Year three	29,116	9,591
Year four	10,058	16,347
Year five	14,217	11,068
Prior	62,760	58,189
Revolving Loans Amortized Cost Basis	483,151	463,334
Loans and leases	643,369	624,364
Consumer | Home equity | 740-799
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	8,128	42,430
Year two	42,151	22,030
Year three	20,593	9,413
Year four	7,809	13,317
Year five	10,159	7,711
Prior	41,587	33,777
Revolving Loans Amortized Cost Basis	435,737	409,518
Loans and leases	566,164	538,196
Consumer | Home equity | 670 to 739
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	4,811	17,493
Year two	18,414	9,162
Year three	8,147	5,889
Year four	5,161	8,220
Year five	8,432	5,802
Prior	34,326	31,160
Revolving Loans Amortized Cost Basis	251,203	233,744
Loans and leases	330,494	311,470
Consumer | Home equity | 580-669
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	290	1,773
Year two	2,023	1,397
Year three	1,394	1,298
Year four	1,037	1,066
Year five	1,835	1,329
Prior	15,424	15,042
Revolving Loans Amortized Cost Basis	84,571	66,361
Loans and leases	106,574	88,266
Consumer | Home equity | 579 and below
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	73	380
Year two	326	446
Year three	676	725
Year four	720	1,060
Year five	647	434
Prior	6,487	5,666
Revolving Loans Amortized Cost Basis	23,913	22,552
Loans and leases	32,842	31,263
Consumer | Consumer Loan
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	304	4,515
Year two	2,343	14,955
Year three	11,706	27,068
Year four	19,383	8,654
Year five	6,458	1,473
Prior	6,139	839
Revolving Loans Amortized Cost Basis	41,424	27,795
Loans and leases	87,757	85,299
Consumer | Consumer Loan | 800+
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	49	463
Year two	352	1,343
Year three	1,205	2,398
Year four	1,918	916
Year five	651	231
Prior	494	118
Revolving Loans Amortized Cost Basis	11,781	10,160
Loans and leases	16,450	15,629
Consumer | Consumer Loan | 740-799
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	57	2,588
Year two	988	5,408
Year three	683	8,303
Year four	779	2,985
Year five	438	379
Prior	3,344	77
Revolving Loans Amortized Cost Basis	10,524	9,528
Loans and leases	16,813	29,268
Consumer | Consumer Loan | 670 to 739
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	1,061
Year two	0	7,034
Year three	3,486	13,602
Year four	5,089	3,859
Year five	1,900	607
Prior	945	412
Revolving Loans Amortized Cost Basis	15,697	5,644
Loans and leases	27,117	32,219
Consumer | Consumer Loan | 580-669
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	185	256
Year two	712	1,083
Year three	5,497	2,550
Year four	9,478	735
Year five	3,002	216
Prior	866	211
Revolving Loans Amortized Cost Basis	1,986	1,267
Loans and leases	21,726	6,318
Consumer | Consumer Loan | 579 and below
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	13	147
Year two	291	87
Year three	835	215
Year four	2,119	159
Year five	467	40
Prior	490	21
Revolving Loans Amortized Cost Basis	1,436	1,196
Loans and leases	$ 5,651	$ 1,865