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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Credit Ratings (Detail) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Jun. 15, 2023	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		$ 550,030		$ 1,570,977
Fiscal year before current year		1,362,831		4,397,333
Two years before current year		4,424,761		1,521,513
Three years before current year		1,445,361		634,860
Four years before current year		602,817		347,230
Prior		1,426,822		1,173,759
Revolving loans amortized cost basis		1,715,051		1,843,180
Revolving loans converted to term		356,991		400,268
Loans and leases receivable		11,884,664		11,889,120
Current year, charge-offs		1,217		9,211
Fiscal year before current year, charge-offs		1,537		24,986
Two years before current fiscal year, charge-offs		6,564		27,153
Three years before current fiscal year, charge-offs		8,634		15,938
Four years before current fiscal year, charge-offs		1,965		6,821
Prior, charge-offs		2,910		10,957
Revolving loans amortized cost basis, charge-offs		0		0
Revolving loans converted to term, charge-offs		0		0
Loans and leases receivable, charge-offs		22,827	$ 21,114	95,066
Allowance for credit losses on FDIC PCD loans, excluding charge-offs	$ 8,700
Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		52,000		74,700
Loans and leases receivable, charge-offs		3,400		10,700
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		10,624,096		10,565,824
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		1,312,525		1,398,031
Commercial loans and leases receivable | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		530,545		1,291,772
Fiscal year before current year		1,108,999		3,911,891
Two years before current year		3,980,801		1,228,524
Three years before current year		1,179,449		577,273
Four years before current year		542,127		290,649
Prior		1,262,296		1,056,227
Revolving loans amortized cost basis		1,610,938		1,734,485
Revolving loans converted to term		356,984		400,268
Loans and leases receivable		10,572,139		10,491,089
Current year, charge-offs		145		1,483
Fiscal year before current year, charge-offs		484		381
Two years before current fiscal year, charge-offs		344		3,169
Three years before current fiscal year, charge-offs		3,397		10,348
Four years before current fiscal year, charge-offs		692		24
Prior, charge-offs		829		9,650
Revolving loans amortized cost basis, charge-offs		0		0
Revolving loans converted to term, charge-offs		0		0
Loans and leases receivable, charge-offs		5,891		25,055
Commercial and industrial, including specialized lending
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		6,274,501		6,211,105
Loans and leases receivable, charge-offs		5,396	160
Commercial and industrial, including specialized lending | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		453,522		1,217,661
Fiscal year before current year		1,036,055		1,952,227
Two years before current year		2,036,833		549,699
Three years before current year		511,091		199,030
Four years before current year		176,336		64,016
Prior		104,030		106,137
Revolving loans amortized cost basis		1,610,938		1,734,485
Revolving loans converted to term		345,696		387,850
Loans and leases receivable		6,274,501		6,211,105
Current year, charge-offs		145		1,483
Fiscal year before current year, charge-offs		484		381
Two years before current fiscal year, charge-offs		344		3,169
Three years before current fiscal year, charge-offs		3,397		10,348
Four years before current fiscal year, charge-offs		692		24
Prior, charge-offs		334		1,510
Revolving loans amortized cost basis, charge-offs		0		0
Revolving loans converted to term, charge-offs		0		0
Loans and leases receivable, charge-offs		5,396		16,915
Commercial and industrial, including specialized lending | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		453,522		1,184,923
Fiscal year before current year		1,023,266		1,909,592
Two years before current year		2,018,082		483,039
Three years before current year		471,404		170,384
Four years before current year		142,178		59,213
Prior		60,734		63,480
Revolving loans amortized cost basis		1,594,160		1,722,559
Revolving loans converted to term		343,934		384,947
Loans and leases receivable		6,107,280		5,978,137
Commercial and industrial, including specialized lending | Special mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0		18,000
Fiscal year before current year		12,090		3,377
Two years before current year		176		5,127
Three years before current year		5,000		1,986
Four years before current year		6,884		0
Prior		3,430		595
Revolving loans amortized cost basis		10,923		7,916
Revolving loans converted to term		1,689		2,903
Loans and leases receivable		40,192		39,904
Commercial and industrial, including specialized lending | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0		14,738
Fiscal year before current year		699		39,258
Two years before current year		18,575		61,533
Three years before current year		34,687		26,660
Four years before current year		27,274		4,803
Prior		39,866		42,062
Revolving loans amortized cost basis		5,855		4,010
Revolving loans converted to term		73		0
Loans and leases receivable		127,029		193,064
Commercial and industrial, including specialized 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
Multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		2,123,675		2,138,622
Loans and leases receivable, charge-offs		473	0
Multifamily | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0		845
Fiscal year before current year		850		1,229,198
Two years before current year		1,239,644		371,016
Three years before current year		344,966		127,493
Four years before current year		128,439		49,514
Prior		409,776		360,556
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		0
Loans and leases receivable		2,123,675		2,138,622
Current year, charge-offs		0		0
Fiscal year before current year, charge-offs		0		0
Two years before current fiscal year, charge-offs		0		0
Three years before current fiscal year, charge-offs		0		0
Four years before current fiscal year, charge-offs		0		0
Prior, charge-offs		473		3,574
Revolving loans amortized cost basis, charge-offs		0		0
Revolving loans converted to term, charge-offs		0		0
Loans and leases receivable, charge-offs		473		3,574
Multifamily | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0		845
Fiscal year before current year		850		1,229,198
Two years before current year		1,239,644		371,016
Three years before current year		344,966		127,493
Four years before current year		128,439		43,046
Prior		284,391		253,806
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		0
Loans and leases receivable		1,998,290		2,025,404
Multifamily | 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		6,468
Prior		88,656		67,035
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		0
Loans and leases receivable		88,656		73,503
Multifamily | 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		36,729		39,715
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		0
Loans and leases receivable		36,729		39,715
Multifamily | 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 loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		806,278		797,319
Loans and leases receivable, charge-offs		22	0
Commercial real estate owner occupied loans: | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		66,614		41,011
Fiscal year before current year		37,447		254,878
Two years before current year		226,892		195,721
Three years before current year		194,190		77,821
Four years before current year		66,229		80,420
Prior		203,618		136,150
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		11,288		11,318
Loans and leases receivable		806,278		797,319
Current year, charge-offs		0		0
Fiscal year before current year, charge-offs		0		0
Two years before current fiscal year, charge-offs		0		0
Three years before current fiscal year, charge-offs		0		0
Four years before current fiscal year, charge-offs		0		0
Prior, charge-offs		22		39
Revolving loans amortized cost basis, charge-offs		0		0
Revolving loans converted to term, charge-offs		0		0
Loans and leases receivable, charge-offs		22		39
Commercial real estate owner occupied loans: | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		66,614		41,011
Fiscal year before current year		34,503		254,878
Two years before current year		226,892		180,289
Three years before current year		178,805		77,821
Four years before current year		66,229		44,382
Prior		152,046		120,248
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		11,288		11,318
Loans and leases receivable		736,377		729,947
Commercial real estate owner occupied loans: | 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		15,432
Three years before current year		0		0
Four years before current year		0		35,691
Prior		35,530		47
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		0
Loans and leases receivable		35,530		51,170
Commercial real estate owner occupied loans: | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0		0
Fiscal year before current year		2,944		0
Two years before current year		0		0
Three years before current year		15,385		0
Four years before current year		0		347
Prior		16,042		15,855
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		0
Loans and leases receivable		34,371		16,202
Commercial real estate owner occupied loans: | 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		1,182,084		1,177,650
Loans and leases receivable, charge-offs		0	4,239
Commercial real estate non-owner occupied | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		7,195		12,906
Fiscal year before current year		16,791		336,791
Two years before current year		342,409		109,521
Three years before current year		103,661		172,929
Four years before current year		171,123		96,699
Prior		540,905		448,804
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		0
Loans and leases receivable		1,182,084		1,177,650
Current year, charge-offs		0		0
Fiscal year before current year, charge-offs		0		0
Two years before current fiscal year, charge-offs		0		0
Three years before current fiscal year, charge-offs		0		0
Four years before current fiscal year, charge-offs		0		0
Prior, charge-offs		0		4,527
Revolving loans amortized cost basis, charge-offs		0		0
Revolving loans converted to term, charge-offs		0		0
Loans and leases receivable, charge-offs		0		4,527
Commercial real estate non-owner occupied | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		7,195		12,906
Fiscal year before current year		16,791		325,881
Two years before current year		337,029		109,521
Three years before current year		103,661		152,227
Four years before current year		150,553		88,586
Prior		456,456		367,996
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		0
Loans and leases receivable		1,071,685		1,057,117
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		0
Two years before current year		5,380		0
Three years before current year		0		20,702
Four years before current year		20,570		0
Prior		415		9,148
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		0
Loans and leases receivable		26,365		29,850
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		10,910
Two years before current year		0		0
Three years before current year		0		0
Four years before current year		0		8,113
Prior		84,034		71,660
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		0
Loans and leases receivable		84,034		90,683
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 loans:
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		185,601		166,393
Loans and leases receivable, charge-offs		0	0
Construction loans: | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		3,214		19,349
Fiscal year before current year		17,856		138,797
Two years before current year		135,023		2,567
Three years before current year		25,541		0
Four years before current year		0		0
Prior		3,967		4,580
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		1,100
Loans and leases receivable		185,601		166,393
Current year, charge-offs		0		0
Fiscal year before current year, charge-offs		0		0
Two years before current fiscal year, charge-offs		0		0
Three years before current fiscal year, charge-offs		0		0
Four years before current fiscal year, charge-offs		0		0
Prior, charge-offs		0		0
Revolving loans amortized cost basis, charge-offs		0		0
Revolving loans converted to term, charge-offs		0		0
Loans and leases receivable, charge-offs		0		0
Construction loans: | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		3,214		17,594
Fiscal year before current year		14,234		138,797
Two years before current year		135,023		2,567
Three years before current year		25,541		0
Four years before current year		0		0
Prior		3,967		4,580
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		1,100
Loans and leases receivable		181,979		164,638
Construction loans: | Special mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0		1,755
Fiscal year before current year		3,622		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		3,622		1,755
Construction loans: | 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 loans: | 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		19,485		279,205
Fiscal year before current year		253,832		485,442
Two years before current year		443,960		292,989
Three years before current year		265,912		57,587
Four years before current year		60,690		56,581
Prior		164,526		117,532
Revolving loans amortized cost basis		104,113		108,695
Revolving loans converted to term		7		0
Loans and leases receivable		1,312,525		1,398,031
Current year, charge-offs		1,072		7,728
Fiscal year before current year, charge-offs		1,053		24,605
Two years before current fiscal year, charge-offs		6,220		23,984
Three years before current fiscal year, charge-offs		5,237		5,590
Four years before current fiscal year, charge-offs		1,273		6,797
Prior, charge-offs		2,081		1,307
Revolving loans amortized cost basis, charge-offs		0		0
Revolving loans converted to term, charge-offs		0		0
Loans and leases receivable, charge-offs		16,936		70,011
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		482,537		484,435
Loans and leases receivable, charge-offs		19	0
Residential real estate | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		4,437		22,613
Fiscal year before current year		22,540		173,774
Two years before current year		172,157		132,857
Three years before current year		131,620		6,687
Four years before current year		6,565		16,053
Prior		90,120		75,426
Revolving loans amortized cost basis		55,098		57,025
Revolving loans converted to term		0		0
Loans and leases receivable		482,537		484,435
Current year, charge-offs		0		0
Fiscal year before current year, charge-offs		0		0
Two years before current fiscal year, charge-offs		0		0
Three years before current fiscal year, charge-offs		0		0
Four years before current fiscal year, charge-offs		0		0
Prior, charge-offs		19		69
Revolving loans amortized cost basis, charge-offs		0		0
Revolving loans converted to term, charge-offs		0		0
Loans and leases receivable, charge-offs		19		69
Residential real estate | Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		4,437		22,613
Fiscal year before current year		22,540		173,424
Two years before current year		171,091		131,621
Three years before current year		129,844		6,458
Four years before current year		6,339		15,508
Prior		85,373		71,433
Revolving loans amortized cost basis		55,093		56,844
Revolving loans converted to term		0		0
Loans and leases receivable		474,717		477,901
Residential real estate | Consumer | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0		0
Fiscal year before current year		0		350
Two years before current year		1,066		1,236
Three years before current year		1,776		229
Four years before current year		226		545
Prior		4,747		3,993
Revolving loans amortized cost basis		5		181
Revolving loans converted to term		0		0
Loans and leases receivable		7,820		6,534
Manufactured housing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		37,382		38,670
Loans and leases receivable, charge-offs		0	0
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		0
Three years before current year		0		0
Four years before current year		0		98
Prior		37,382		38,572
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		0
Loans and leases receivable		37,382		38,670
Current year, charge-offs		0		0
Fiscal year before current year, charge-offs		0		0
Two years before current fiscal year, charge-offs		0		0
Three years before current fiscal year, charge-offs		0		0
Four years before current fiscal year, charge-offs		0		0
Prior, charge-offs		0		0
Revolving loans amortized cost basis, charge-offs		0		0
Revolving loans converted to term, charge-offs		0		0
Loans and leases receivable, charge-offs		0		0
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		0
Three years before current year		0		0
Four years before current year		0		98
Prior		35,185		36,464
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		0
Loans and leases receivable		35,185		36,562
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		2,197		2,108
Revolving loans amortized cost basis		0		0
Revolving loans converted to term		0		0
Loans and leases receivable		2,197		2,108
Installment
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		792,606		874,926
Loans and leases receivable, charge-offs		16,917	$ 16,715
Installment | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		15,048		256,592
Fiscal year before current year		231,292		311,668
Two years before current year		271,803		160,132
Three years before current year		134,292		50,900
Four years before current year		54,125		40,430
Prior		37,024		3,534
Revolving loans amortized cost basis		49,015		51,670
Revolving loans converted to term		7		0
Loans and leases receivable		792,606		874,926
Current year, charge-offs		1,072		7,728
Fiscal year before current year, charge-offs		1,053		24,605
Two years before current fiscal year, charge-offs		6,220		23,984
Three years before current fiscal year, charge-offs		5,237		5,590
Four years before current fiscal year, charge-offs		1,273		6,797
Prior, charge-offs		2,062		1,238
Revolving loans amortized cost basis, charge-offs		0		0
Revolving loans converted to term, charge-offs		0		0
Loans and leases receivable, charge-offs		16,917		69,942
Installment | Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		15,048		253,958
Fiscal year before current year		227,664		307,566
Two years before current year		268,738		158,381
Three years before current year		132,929		50,354
Four years before current year		53,774		39,953
Prior		36,543		3,448
Revolving loans amortized cost basis		48,852		51,480
Revolving loans converted to term		7		0
Loans and leases receivable		783,555		865,140
Installment | Consumer | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0		2,634
Fiscal year before current year		3,628		4,102
Two years before current year		3,065		1,751
Three years before current year		1,363		546
Four years before current year		351		477
Prior		481		86
Revolving loans amortized cost basis		163		190
Revolving loans converted to term		0		0
Loans and leases receivable		9,051		9,786
Specialized lending | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		$ 5,104,405		$ 5,006,693
Charge-off of certain PCD loans	$ 6,200

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