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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		6 Months Ended	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Jun. 30, 2024	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	$ 1,184,591			$ 3,062,945
Fiscal year before current year	2,535,644			1,059,296
Two years before current year	1,148,797			3,670,879
Three years before current year	3,450,587			1,178,057
Four years before current year	1,113,064			492,198
Prior	1,664,852			1,236,906
Revolving loans amortized cost basis	2,140,680			2,050,813
Revolving loans converted to term	298,917			353,789
Loans and leases receivable	13,537,132			13,104,883
Current year, charge-offs	217		$ 3,109
Fiscal year before current year, charge-offs	658		11,556
Two years before current fiscal year, charge-offs	3,402		28,540
Three years before current fiscal year, charge-offs	8,842		20,076
Four years before current fiscal year, charge-offs	2,576		5,385
Prior, charge-offs	5,068		15,799
Revolving loans amortized cost basis, charge-offs	0		0
Revolving loans converted to term, charge-offs	0		0
Loans and leases receivable, charge-offs	20,763	$ 22,827	84,465
Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable, charge-offs				5,000
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	12,299,264			11,884,299
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	1,256,556			1,243,335
Commercial loans and leases receivable | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	1,166,918			2,930,794
Fiscal year before current year	2,407,741			872,270
Two years before current year	897,293			3,249,006
Three years before current year	3,058,903			954,517
Four years before current year	910,187			453,986
Prior	1,495,589			1,094,132
Revolving loans amortized cost basis	2,045,031			1,953,059
Revolving loans converted to term	298,914			353,784
Loans and leases receivable	12,280,576			11,861,548
Current year, charge-offs	0		312
Fiscal year before current year, charge-offs	0		2,765
Two years before current fiscal year, charge-offs	103		5,833
Three years before current fiscal year, charge-offs	4,013		4,865
Four years before current fiscal year, charge-offs	12		2,574
Prior, charge-offs	4,232		11,969
Revolving loans amortized cost basis, charge-offs	0		0
Revolving loans converted to term, charge-offs	0		0
Loans and leases receivable, charge-offs	8,360		28,318
Commercial and industrial, including specialized lending
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	7,225,774			7,002,019
Loans and leases receivable, charge-offs	4,507	5,396
Commercial and industrial, including specialized lending | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	877,373			2,120,055
Fiscal year before current year	1,588,832			740,087
Two years before current year	758,701			1,328,847
Three years before current year	1,150,238			346,115
Four years before current year	306,119			112,018
Prior	221,358			68,899
Revolving loans amortized cost basis	2,035,427			1,943,454
Revolving loans converted to term	287,726			342,544
Loans and leases receivable	7,225,774			7,002,019
Current year, charge-offs	0		312
Fiscal year before current year, charge-offs	0		2,765
Two years before current fiscal year, charge-offs	103		5,833
Three years before current fiscal year, charge-offs	4,013		4,865
Four years before current fiscal year, charge-offs	12		2,429
Prior, charge-offs	379		7,531
Revolving loans amortized cost basis, charge-offs	0		0
Revolving loans converted to term, charge-offs	0		0
Loans and leases receivable, charge-offs	4,507		23,735
Commercial and industrial, including specialized lending | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	870,173			2,103,150
Fiscal year before current year	1,568,549			738,456
Two years before current year	757,704			1,278,246
Three years before current year	1,095,070			333,068
Four years before current year	296,349			107,840
Prior	156,307			6,742
Revolving loans amortized cost basis	2,000,301			1,907,480
Revolving loans converted to term	276,874			336,100
Loans and leases receivable	7,021,327			6,811,082
Commercial and industrial, including specialized lending | Special mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	7,200			16,905
Fiscal year before current year	19,278			0
Two years before current year	466			6,933
Three years before current year	18,920			1,522
Four years before current year	107			0
Prior	0			62
Revolving loans amortized cost basis	6,145			8,144
Revolving loans converted to term	8,159			3,630
Loans and leases receivable	60,275			37,196
Commercial and industrial, including specialized lending | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0			0
Fiscal year before current year	1,005			1,631
Two years before current year	531			43,668
Three years before current year	36,248			11,525
Four years before current year	9,663			4,178
Prior	65,051			62,095
Revolving loans amortized cost basis	28,981			27,830
Revolving loans converted to term	2,693			2,814
Loans and leases receivable	144,172			153,741
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
Loans and leases receivable	0			0
Multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	2,322,123			2,252,246
Loans and leases receivable, charge-offs	3,834	473
Multifamily | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	126,248			235,685
Fiscal year before current year	238,962			813
Two years before current year	803			1,196,411
Three years before current year	1,189,954			300,148
Four years before current year	297,503			124,779
Prior	468,653			394,410
Revolving loans amortized cost basis	0			0
Revolving loans converted to term	0			0
Loans and leases receivable	2,322,123			2,252,246
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	3,834		4,073
Revolving loans amortized cost basis, charge-offs	0		0
Revolving loans converted to term, charge-offs			0
Loans and leases receivable, charge-offs	3,834		4,073
Multifamily | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	126,248			235,685
Fiscal year before current year	238,962			813
Two years before current year	803			1,182,371
Three years before current year	1,171,382			288,055
Four years before current year	285,480			124,779
Prior	393,640			314,967
Revolving loans amortized cost basis	0			0
Revolving loans converted to term	0			0
Loans and leases receivable	2,216,515			2,146,670
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			14,040
Three years before current year	18,572			12,093
Four years before current year	0			0
Prior	30,800			32,316
Revolving loans amortized cost basis	0			0
Revolving loans converted to term	0			0
Loans and leases receivable	49,372			58,449
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	12,023			0
Prior	44,213			47,127
Revolving loans amortized cost basis	0			0
Revolving loans converted to term	0			0
Loans and leases receivable	56,236			47,127
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	1,139,126			1,100,944
Loans and leases receivable, charge-offs	19	22
Commercial real estate owner occupied loans: | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	61,337			395,522
Fiscal year before current year	394,556			57,300
Two years before current year	56,866			212,162
Three years before current year	210,607			211,598
Four years before current year	210,738			52,078
Prior	186,230			153,439
Revolving loans amortized cost basis	7,604			7,605
Revolving loans converted to term	11,188			11,240
Loans and leases receivable	1,139,126			1,100,944
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		365
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		365
Commercial real estate owner occupied loans: | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	61,337			395,522
Fiscal year before current year	394,556			54,356
Two years before current year	53,922			211,300
Three years before current year	209,748			195,169
Four years before current year	194,376			42,078
Prior	168,200			118,677
Revolving loans amortized cost basis	7,604			7,605
Revolving loans converted to term	97			104
Loans and leases receivable	1,089,840			1,024,811
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			159
Three years before current year	156			16,429
Four years before current year	16,362			10,000
Prior	4,650			15,885
Revolving loans amortized cost basis	0			0
Revolving loans converted to term	11,091			11,136
Loans and leases receivable	32,259			53,609
Commercial real estate owner occupied loans: | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0			0
Fiscal year before current year	0			2,944
Two years before current year	2,944			703
Three years before current year	703			0
Four years before current year	0			0
Prior	13,380			18,877
Revolving loans amortized cost basis	0			0
Revolving loans converted to term	0			0
Loans and leases receivable	17,027			22,524
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			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	1,438,906			1,359,130
Loans and leases receivable, charge-offs	0	0
Commercial real estate non-owner occupied | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	101,960			163,429
Fiscal year before current year	163,009			42,367
Two years before current year	42,307			416,629
Three years before current year	414,455			96,656
Four years before current year	95,827			165,111
Prior	619,348			472,938
Revolving loans amortized cost basis	2,000			2,000
Revolving loans converted to term	0			0
Loans and leases receivable	1,438,906			1,359,130
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		145
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		145
Commercial real estate non-owner occupied | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	101,960			163,429
Fiscal year before current year	163,009			30,367
Two years before current year	30,307			412,352
Three years before current year	389,600			96,656
Four years before current year	95,827			165,111
Prior	560,208			413,336
Revolving loans amortized cost basis	2,000			2,000
Revolving loans converted to term	0			0
Loans and leases receivable	1,342,911			1,283,251
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			12,000
Two years before current year	12,000			4,277
Three years before current year	24,855			0
Four years before current year	0			0
Prior	557			431
Revolving loans amortized cost basis	0			0
Revolving loans converted to term	0			0
Loans and leases receivable	37,412			16,708
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	0			0
Four years before current year	0			0
Prior	58,583			59,171
Revolving loans amortized cost basis	0			0
Revolving loans converted to term	0			0
Loans and leases receivable	58,583			59,171
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	154,647			147,209
Loans and leases receivable, charge-offs	0	0
Construction loans: | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0			16,103
Fiscal year before current year	22,382			31,703
Two years before current year	38,616			94,957
Three years before current year	93,649			0
Four years before current year	0			0
Prior	0			4,446
Revolving loans amortized cost basis	0			0
Revolving loans converted to term	0			0
Loans and leases receivable	154,647			147,209
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	0			16,103
Fiscal year before current year	22,382			22,610
Two years before current year	28,779			94,957
Three years before current year	93,649			0
Four years before current year	0			0
Prior	0			4,446
Revolving loans amortized cost basis	0			0
Revolving loans converted to term	0			0
Loans and leases receivable	144,810			138,116
Construction loans: | Special mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0			0
Fiscal year before current year	0			9,093
Two years before current year	9,837			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	9,837			9,093
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	17,673			132,151
Fiscal year before current year	127,903			187,026
Two years before current year	251,504			421,873
Three years before current year	391,684			223,540
Four years before current year	202,877			38,212
Prior	169,263			142,774
Revolving loans amortized cost basis	95,649			97,754
Revolving loans converted to term	3			5
Loans and leases receivable	1,256,556			1,243,335
Current year, charge-offs	217		2,797
Fiscal year before current year, charge-offs	658		8,791
Two years before current fiscal year, charge-offs	3,299		22,707
Three years before current fiscal year, charge-offs	4,829		15,211
Four years before current fiscal year, charge-offs	2,564		2,811
Prior, charge-offs	836		3,830
Revolving loans amortized cost basis, charge-offs	0		0
Revolving loans converted to term, charge-offs	0		0
Loans and leases receivable, charge-offs	12,403		56,147
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	496,772			496,559
Loans and leases receivable, charge-offs	0	19
Residential real estate | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	8,055			45,895
Fiscal year before current year	45,931			20,974
Two years before current year	20,825			164,398
Three years before current year	162,204			124,247
Four years before current year	122,869			6,144
Prior	87,849			83,414
Revolving loans amortized cost basis	49,039			51,487
Revolving loans converted to term	0			0
Loans and leases receivable	496,772			496,559
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		38
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		38
Residential real estate | Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	8,055			45,757
Fiscal year before current year	45,794			20,701
Two years before current year	20,557			163,473
Three years before current year	160,993			123,170
Four years before current year	121,810			5,827
Prior	83,313			77,989
Revolving loans amortized cost basis	48,752			50,807
Revolving loans converted to term	0			0
Loans and leases receivable	489,274			487,724
Residential real estate | Consumer | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0			138
Fiscal year before current year	137			273
Two years before current year	268			925
Three years before current year	1,211			1,077
Four years before current year	1,059			317
Prior	4,536			5,425
Revolving loans amortized cost basis	287			680
Revolving loans converted to term	0			0
Loans and leases receivable	7,498			8,835
Manufactured housing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	31,775			33,123
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			0
Prior	31,775			33,123
Revolving loans amortized cost basis	0			0
Revolving loans converted to term	0			0
Loans and leases receivable	31,775			33,123
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			0
Prior	30,653			31,570
Revolving loans amortized cost basis	0			0
Revolving loans converted to term	0			0
Loans and leases receivable	30,653			31,570
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	1,122			1,553
Revolving loans amortized cost basis	0			0
Revolving loans converted to term	0			0
Loans and leases receivable	1,122			1,553
Installment
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	728,009			713,653
Loans and leases receivable, charge-offs	12,403	$ 16,917
Installment | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	9,618			86,256
Fiscal year before current year	81,972			166,052
Two years before current year	230,679			257,475
Three years before current year	229,480			99,293
Four years before current year	80,008			32,068
Prior	49,639			26,237
Revolving loans amortized cost basis	46,610			46,267
Revolving loans converted to term	3			5
Loans and leases receivable	728,009			713,653
Current year, charge-offs	217		2,797
Fiscal year before current year, charge-offs	658		8,791
Two years before current fiscal year, charge-offs	3,299		22,707
Three years before current fiscal year, charge-offs	4,829		15,211
Four years before current fiscal year, charge-offs	2,564		2,811
Prior, charge-offs	836		3,792
Revolving loans amortized cost basis, charge-offs	0		0
Revolving loans converted to term, charge-offs	0		0
Loans and leases receivable, charge-offs	12,403		$ 56,109
Installment | Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	9,618			86,018
Fiscal year before current year	80,834			164,223
Two years before current year	229,157			255,777
Three years before current year	228,396			98,375
Four years before current year	79,363			31,808
Prior	49,056			25,733
Revolving loans amortized cost basis	46,399			46,126
Revolving loans converted to term	3			5
Loans and leases receivable	722,826			708,065
Installment | Consumer | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0			238
Fiscal year before current year	1,138			1,829
Two years before current year	1,522			1,698
Three years before current year	1,084			918
Four years before current year	645			260
Prior	583			504
Revolving loans amortized cost basis	211			141
Revolving loans converted to term	0			0
Loans and leases receivable	5,183			5,588
Specialized lending | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	$ 6,070,093			$ 5,842,420

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