Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Credit Ratings (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	$ 5,302,383	$ 2,885,998
Fiscal year before current year	1,964,056	1,162,342
Two years before current year	819,042	983,444
Three years before current year	638,237	553,607
Four years before current year	359,291	732,071
Prior	1,286,507	1,103,651
Revolving loans amortized cost basis	2,238,226	1,597,185
Revolving loans converted to term	0	0
Loans and leases receivable	12,607,742	9,018,298
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	10,697,085	6,886,232
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	1,910,657	2,132,066
Commercial loans and leases receivable | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	4,584,613	1,803,457
Fiscal year before current year	1,388,727	762,301
Two years before current year	662,223	618,104
Three years before current year	466,832	509,267
Four years before current year	334,219	723,019
Prior	1,159,109	962,716
Revolving loans amortized cost basis	2,101,362	1,507,368
Revolving loans converted to term	0	0
Loans and leases receivable	10,697,085	6,886,232
Commercial and industrial, including specialty lending
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	6,307,803	3,424,783
Commercial and industrial, including specialty lending | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	2,811,777	993,278
Fiscal year before current year	667,041	348,710
Two years before current year	298,913	279,545
Three years before current year	219,553	103,181
Four years before current year	80,042	97,470
Prior	131,190	96,716
Revolving loans amortized cost basis	2,099,287	1,505,883
Revolving loans converted to term	0	0
Loans and leases receivable	6,307,803	3,424,783
Commercial and industrial, including specialty lending | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	2,811,777	974,016
Fiscal year before current year	638,308	337,045
Two years before current year	290,113	266,677
Three years before current year	210,755	86,691
Four years before current year	72,613	55,536
Prior	87,766	89,860
Revolving loans amortized cost basis	2,091,816	1,484,287
Revolving loans converted to term	0	0
Loans and leases receivable	6,203,148	3,294,112
Commercial and industrial, including specialty lending | Special mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	476
Fiscal year before current year	6,000	1,408
Two years before current year	0	3,325
Three years before current year	0	4,904
Four years before current year	0	36,252
Prior	290	92
Revolving loans amortized cost basis	2,816	14,662
Revolving loans converted to term	0	0
Loans and leases receivable	9,106	61,119
Commercial and industrial, including specialty lending | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	18,786
Fiscal year before current year	22,733	10,257
Two years before current year	8,800	9,543
Three years before current year	8,798	11,586
Four years before current year	7,429	5,682
Prior	43,134	6,764
Revolving loans amortized cost basis	4,655	6,934
Revolving loans converted to term	0	0
Loans and leases receivable	95,549	69,552
Commercial and industrial, including specialty lending | Doubtful | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current year	0	0
Two years before current year	0	0
Three years before current year	0	0
Four years before current year	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans and leases receivable	0	0
Multi-family
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	2,263,268	1,486,308
Multi-family | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,257,398	403,075
Fiscal year before current year	366,238	133,452
Two years before current year	131,310	23,068
Three years before current year	22,364	219,006
Four years before current year	119,414	339,368
Prior	366,544	368,339
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans and leases receivable	2,263,268	1,486,308
Multi-family | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,257,398	403,075
Fiscal year before current year	364,730	133,452
Two years before current year	131,310	23,068
Three years before current year	22,364	209,070
Four years before current year	114,430	282,663
Prior	241,843	316,491
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans and leases receivable	2,132,075	1,367,819
Multi-family | Special mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current year	0	0
Two years before current year	0	0
Three years before current year	0	9,936
Four years before current year	4,984	18,489
Prior	58,964	28,776
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans and leases receivable	63,948	57,201
Multi-family | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current year	1,508	0
Two years before current year	0	0
Three years before current year	0	0
Four years before current year	0	38,216
Prior	65,737	23,072
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans and leases receivable	67,245	61,288
Multi-family | Doubtful | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current year	0	0
Two years before current year	0	0
Three years before current year	0	0
Four years before current year	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans and leases receivable	0	0
Commercial real estate owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	726,670	654,922
Commercial real estate owner occupied | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	186,167	213,102
Fiscal year before current year	203,200	59,348
Two years before current year	56,956	131,252
Three years before current year	92,571	70,993
Four years before current year	45,970	68,941
Prior	141,806	110,614
Revolving loans amortized cost basis	0	672
Revolving loans converted to term	0	0
Loans and leases receivable	726,670	654,922
Commercial real estate owner occupied | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	186,167	213,102
Fiscal year before current year	203,200	59,348
Two years before current year	56,956	124,626
Three years before current year	92,437	60,993
Four years before current year	36,062	58,073
Prior	129,565	99,219
Revolving loans amortized cost basis	0	672
Revolving loans converted to term	0	0
Loans and leases receivable	704,387	616,033
Commercial real estate owner occupied | Special mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current year	0	0
Two years before current year	0	2,876
Three years before current year	0	318
Four years before current year	461	2,044
Prior	3,858	572
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans and leases receivable	4,319	5,810
Commercial real estate owner occupied | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current year	0	0
Two years before current year	0	3,750
Three years before current year	134	9,682
Four years before current year	9,447	8,824
Prior	8,383	10,823
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans and leases receivable	17,964	33,079
Commercial real estate owner occupied | Doubtful | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current year	0	0
Two years before current year	0	0
Three years before current year	0	0
Four years before current year		0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans and leases receivable	0	0
Commercial real estate non-owner occupied
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	1,263,211	1,121,238
Commercial real estate non-owner occupied | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	279,854	136,897
Fiscal year before current year	119,817	171,592
Two years before current year	165,534	106,617
Three years before current year	103,527	111,259
Four years before current year	84,071	217,240
Prior	510,408	377,633
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans and leases receivable	1,263,211	1,121,238
Commercial real estate non-owner occupied | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	279,854	136,897
Fiscal year before current year	119,817	149,898
Two years before current year	144,199	95,504
Three years before current year	74,694	66,040
Four years before current year	63,318	153,509
Prior	405,022	310,435
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans and leases receivable	1,086,904	912,283
Commercial real estate non-owner occupied | Special mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current year	0	21,694
Two years before current year	21,335	11,113
Three years before current year	0	9,373
Four years before current year	0	43,215
Prior	5,852	20,540
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans and leases receivable	27,187	105,935
Commercial real estate non-owner occupied | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current year	0	0
Two years before current year	0	0
Three years before current year	28,833	35,846
Four years before current year	20,753	20,516
Prior	99,534	46,658
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans and leases receivable	149,120	103,020
Commercial real estate non-owner occupied | Doubtful | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current year	0	0
Two years before current year	0	0
Three years before current year	0	0
Four years before current year	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans and leases receivable	0	0
Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	136,133	198,981
Construction | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	49,417	57,105
Fiscal year before current year	32,431	49,199
Two years before current year	9,510	77,622
Three years before current year	28,817	4,828
Four years before current year	4,722	0
Prior	9,161	9,414
Revolving loans amortized cost basis	2,075	813
Revolving loans converted to term	0	0
Loans and leases receivable	136,133	198,981
Construction | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	49,417	57,105
Fiscal year before current year	32,431	49,199
Two years before current year	9,510	77,622
Three years before current year	28,817	4,828
Four years before current year	4,722	0
Prior	9,161	9,414
Revolving loans amortized cost basis	2,075	813
Revolving loans converted to term	0	0
Loans and leases receivable	136,133	198,981
Construction | Special mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current year	0	0
Two years before current year	0	0
Three years before current year	0	0
Four years before current year	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans and leases receivable	0	0
Construction | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current year	0	0
Two years before current year	0	0
Three years before current year	0	0
Four years before current year	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans and leases receivable	0	0
Construction | Doubtful | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current year	0	0
Two years before current year	0	0
Three years before current year	0	0
Four years before current year	0	0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans and leases receivable	0	0
Consumer loans | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	717,770	1,082,541
Fiscal year before current year	575,329	400,041
Two years before current year	156,819	365,340
Three years before current year	171,405	44,340
Four years before current year	25,072	9,052
Prior	127,398	140,935
Revolving loans amortized cost basis	136,864	89,817
Revolving loans converted to term	0	0
Loans and leases receivable	1,910,657	2,132,066
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	465,772	334,730
Residential real estate | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	136,267	107,854
Fiscal year before current year	144,010	8,251
Two years before current year	7,597	21,431
Three years before current year	17,015	12,404
Four years before current year	11,849	7,376
Prior	79,539	87,622
Revolving loans amortized cost basis	69,495	89,792
Revolving loans converted to term	0	0
Loans and leases receivable	465,772	334,730
Residential real estate | Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	136,267	107,854
Fiscal year before current year	144,010	8,251
Two years before current year	7,420	21,096
Three years before current year	16,643	11,389
Four years before current year	10,471	6,707
Prior	75,826	84,035
Revolving loans amortized cost basis	68,839	87,438
Revolving loans converted to term	0	0
Loans and leases receivable	459,476	326,770
Residential real estate | Consumer | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current year	0	0
Two years before current year	177	335
Three years before current year	372	1,015
Four years before current year	1,378	669
Prior	3,713	3,587
Revolving loans amortized cost basis	656	2,354
Revolving loans converted to term	0	0
Loans and leases receivable	6,296	7,960
Manufactured housing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	46,990	52,861
Manufactured housing | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current year	0	0
Two years before current year	0	253
Three years before current year	218	299
Four years before current year	105	73
Prior	46,667	52,236
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans and leases receivable	46,990	52,861
Manufactured housing | Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current year	0	0
Two years before current year	0	253
Three years before current year	218	299
Four years before current year	105	73
Prior	43,801	47,537
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans and leases receivable	44,124	48,162
Manufactured housing | Consumer | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0	0
Fiscal year before current year	0	0
Two years before current year	0	0
Three years before current year	0	0
Four years before current year	0	0
Prior	2,866	4,699
Revolving loans amortized cost basis	0	0
Revolving loans converted to term	0	0
Loans and leases receivable	2,866	4,699
Installment
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	1,397,895	1,744,475
Installment | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	581,503	974,687
Fiscal year before current year	431,319	391,790
Two years before current year	149,222	343,656
Three years before current year	154,172	31,637
Four years before current year	13,118	1,603
Prior	1,192	1,077
Revolving loans amortized cost basis	67,369	25
Revolving loans converted to term	0	0
Loans and leases receivable	1,397,895	1,744,475
Installment | Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	580,370	973,525
Fiscal year before current year	427,400	390,788
Two years before current year	148,318	341,582
Three years before current year	152,836	31,481
Four years before current year	13,033	1,601
Prior	1,132	1,016
Revolving loans amortized cost basis	67,288	25
Revolving loans converted to term	0	0
Loans and leases receivable	1,390,377	1,740,018
Installment | Consumer | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,133	1,162
Fiscal year before current year	3,919	1,002
Two years before current year	904	2,074
Three years before current year	1,336	156
Four years before current year	85	2
Prior	60	61
Revolving loans amortized cost basis	81	0
Revolving loans converted to term	0	0
Loans and leases receivable	$ 7,518	$ 4,457