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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
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	$ 778,190		$ 6,146,506
Fiscal year before current year	5,611,661		1,911,220
Two years before current year	1,855,259		803,531
Three years before current year	767,892		570,940
Four years before current year	540,652		322,745
Prior	1,406,195		1,176,989
Revolving loans amortized cost basis	2,105,239		2,212,963
Revolving loans converted to term	80,264		0
Loans and leases receivable	13,145,352		13,144,894
Current year, charge-offs	1,724
Fiscal year before current year, charge-offs	4,192
Two years before current fiscal year, charge-offs	6,863
Three years before current fiscal year, charge-offs	1,655
Four years before current fiscal year, charge-offs	1,933
Prior, charge-offs	4,747
Revolving loans amortized cost basis, charge-offs	0
Revolving loans converted to term, charge-offs	0
Loans and leases receivable, charge-offs	21,114	$ 9,170
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	11,338,760		11,223,927
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	1,806,592		1,920,967
Commercial loans and leases receivable | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	736,989		5,193,155
Fiscal year before current year	4,830,942		1,452,552
Two years before current year	1,361,563		694,873
Three years before current year	654,681		451,477
Four years before current year	419,826		301,987
Prior	1,275,017		1,050,269
Revolving loans amortized cost basis	1,979,478		2,079,614
Revolving loans converted to term	80,264		0
Loans and leases receivable	11,338,760		11,223,927
Current year, charge-offs	0
Fiscal year before current year, charge-offs	0
Two years before current fiscal year, charge-offs	7
Three years before current fiscal year, charge-offs	0
Four years before current fiscal year, charge-offs	0
Prior, charge-offs	4,392
Revolving loans amortized cost basis, charge-offs	0
Revolving loans converted to term, charge-offs	0
Loans and leases receivable, charge-offs	4,399
Commercial and industrial, including specialty lending
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	6,814,864		6,672,830
Loans and leases receivable, charge-offs	160	301
Commercial and industrial, including specialty lending | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	712,320		3,217,384
Fiscal year before current year	2,835,373		711,072
Two years before current year	634,217		271,263
Three years before current year	234,193		207,297
Four years before current year	177,838		64,786
Prior	162,849		123,143
Revolving loans amortized cost basis	1,978,910		2,077,885
Revolving loans converted to term	79,164		0
Loans and leases receivable	6,814,864		6,672,830
Current year, charge-offs	0
Fiscal year before current year, charge-offs	0
Two years before current fiscal year, charge-offs	7
Three years before current fiscal year, charge-offs	0
Four years before current fiscal year, charge-offs	0
Prior, charge-offs	153
Revolving loans amortized cost basis, charge-offs	0
Revolving loans converted to term, charge-offs	0
Loans and leases receivable, charge-offs	160
Commercial and industrial, including specialty lending | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	706,320		3,206,250
Fiscal year before current year	2,821,406		682,132
Two years before current year	610,166		242,516
Three years before current year	205,708		198,866
Four years before current year	169,511		56,572
Prior	116,433		83,417
Revolving loans amortized cost basis	1,969,270		2,066,349
Revolving loans converted to term	78,949		0
Loans and leases receivable	6,677,763		6,536,102
Commercial and industrial, including specialty lending | Special mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	6,000		11,134
Fiscal year before current year	10,967		6,023
Two years before current year	355		27,780
Three years before current year	23,813		0
Four years before current year	0		1,501
Prior	1,637		172
Revolving loans amortized cost basis	1,795		2,599
Revolving loans converted to term	215		0
Loans and leases receivable	44,782		49,209
Commercial and industrial, including specialty lending | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		0
Fiscal year before current year	3,000		22,917
Two years before current year	23,696		967
Three years before current year	4,672		8,431
Four years before current year	8,327		6,713
Prior	44,779		39,554
Revolving loans amortized cost basis	7,845		8,937
Revolving loans converted to term	0		0
Loans and leases receivable	92,319		87,519
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
Multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	2,195,211		2,213,019
Loans and leases receivable, charge-offs	0	0
Multifamily | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		1,260,544
Fiscal year before current year	1,255,264		365,547
Two years before current year	363,407		130,656
Three years before current year	129,659		22,167
Four years before current year	21,944		117,171
Prior	424,937		316,934
Revolving loans amortized cost basis	0		0
Revolving loans converted to term	0		0
Loans and leases receivable	2,195,211		2,213,019
Current year, charge-offs	0
Fiscal year before current year, charge-offs	0
Two years before current fiscal year, charge-offs	0
Three years before current fiscal year, charge-offs	0
Four years before current fiscal year, charge-offs	0
Prior, charge-offs	0
Revolving loans amortized cost basis, charge-offs	0
Revolving loans converted to term, charge-offs	0
Loans and leases receivable, charge-offs	0
Multifamily | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		1,260,544
Fiscal year before current year	1,255,264		364,047
Two years before current year	361,915		130,656
Three years before current year	129,659		22,167
Four years before current year	21,944		112,212
Prior	324,392		203,215
Revolving loans amortized cost basis	0		0
Revolving loans converted to term	0		0
Loans and leases receivable	2,093,174		2,092,841
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		4,959
Prior	60,200		50,858
Revolving loans amortized cost basis	0		0
Revolving loans converted to term	0		0
Loans and leases receivable	60,200		55,817
Multifamily | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		0
Fiscal year before current year	0		1,500
Two years before current year	1,492		0
Three years before current year	0		0
Four years before current year	0		0
Prior	40,345		62,861
Revolving loans amortized cost basis	0		0
Revolving loans converted to term	0		0
Loans and leases receivable	41,837		64,361
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
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	895,314		885,339
Loans and leases receivable, charge-offs	0	0
Commercial real estate owner occupied | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	24,001		293,096
Fiscal year before current year	304,107		220,515
Two years before current year	206,692		105,925
Three years before current year	107,215		90,886
Four years before current year	91,642		44,899
Prior	161,657		130,018
Revolving loans amortized cost basis	0		0
Revolving loans converted to term	0		0
Loans and leases receivable	895,314		885,339
Current year, charge-offs	0
Fiscal year before current year, charge-offs	0
Two years before current fiscal year, charge-offs	0
Three years before current fiscal year, charge-offs	0
Four years before current fiscal year, charge-offs	0
Prior, charge-offs	0
Revolving loans amortized cost basis, charge-offs	0
Revolving loans converted to term, charge-offs	0
Loans and leases receivable, charge-offs	0
Commercial real estate owner occupied | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	24,001		293,096
Fiscal year before current year	304,107		220,515
Two years before current year	206,692		105,925
Three years before current year	107,215		90,752
Four years before current year	91,158		34,196
Prior	142,199		121,616
Revolving loans amortized cost basis	0		0
Revolving loans converted to term	0		0
Loans and leases receivable	875,372		866,100
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		0
Three years before current year	0		0
Four years before current year	350		134
Prior	1,962		1,841
Revolving loans amortized cost basis	0		0
Revolving loans converted to term	0		0
Loans and leases receivable	2,312		1,975
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		0
Three years before current year	0		134
Four years before current year	134		10,569
Prior	17,496		6,561
Revolving loans amortized cost basis	0		0
Revolving loans converted to term	0		0
Loans and leases receivable	17,630		17,264
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	1,245,248		1,290,730
Loans and leases receivable, charge-offs	4,239	0
Commercial real estate non-owner occupied | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	668		349,954
Fiscal year before current year	343,005		119,304
Two years before current year	116,170		177,492
Three years before current year	173,696		102,483
Four years before current year	99,890		70,435
Prior	511,819		471,062
Revolving loans amortized cost basis	0		0
Revolving loans converted to term	0		0
Loans and leases receivable	1,245,248		1,290,730
Current year, charge-offs	0
Fiscal year before current year, charge-offs	0
Two years before current fiscal year, charge-offs	0
Three years before current fiscal year, charge-offs	0
Four years before current fiscal year, charge-offs	0
Prior, charge-offs	4,239
Revolving loans amortized cost basis, charge-offs	0
Revolving loans converted to term, charge-offs	0
Loans and leases receivable, charge-offs	4,239
Commercial real estate non-owner occupied | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	668		339,044
Fiscal year before current year	332,095		119,304
Two years before current year	116,170		156,281
Three years before current year	152,613		73,827
Four years before current year	71,417		62,237
Prior	421,225		386,235
Revolving loans amortized cost basis	0		0
Revolving loans converted to term	0		0
Loans and leases receivable	1,094,188		1,136,928
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	0		21,211
Three years before current year	21,083		0
Four years before current year	0		0
Prior	8,609		10,617
Revolving loans amortized cost basis	0		0
Revolving loans converted to term	0		0
Loans and leases receivable	29,692		31,828
Commercial real estate non-owner occupied | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		10,910
Fiscal year before current year	10,910		0
Two years before current year	0		0
Three years before current year	0		28,656
Four years before current year	28,473		8,198
Prior	81,985		74,210
Revolving loans amortized cost basis	0		0
Revolving loans converted to term	0		0
Loans and leases receivable	121,368		121,974
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	188,123		162,009
Loans and leases receivable, charge-offs	0	0
Construction | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		72,177
Fiscal year before current year	93,193		36,114
Two years before current year	41,077		9,537
Three years before current year	9,918		28,644
Four years before current year	28,512		4,696
Prior	13,755		9,112
Revolving loans amortized cost basis	568		1,729
Revolving loans converted to term	1,100		0
Loans and leases receivable	188,123		162,009
Current year, charge-offs	0
Fiscal year before current year, charge-offs	0
Two years before current fiscal year, charge-offs	0
Three years before current fiscal year, charge-offs	0
Four years before current fiscal year, charge-offs	0
Prior, charge-offs	0
Revolving loans amortized cost basis, charge-offs	0
Revolving loans converted to term, charge-offs	0
Loans and leases receivable, charge-offs	0
Construction | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		72,177
Fiscal year before current year	93,193		36,114
Two years before current year	41,077		9,537
Three years before current year	9,918		28,644
Four years before current year	28,512		4,696
Prior	13,755		9,112
Revolving loans amortized cost basis	568		1,729
Revolving loans converted to term	1,100		0
Loans and leases receivable	188,123		162,009
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	41,201		953,351
Fiscal year before current year	780,719		458,668
Two years before current year	493,696		108,658
Three years before current year	113,211		119,463
Four years before current year	120,826		20,758
Prior	131,178		126,720
Revolving loans amortized cost basis	125,761		133,349
Revolving loans converted to term	0		0
Loans and leases receivable	1,806,592		1,920,967
Current year, charge-offs	1,724
Fiscal year before current year, charge-offs	4,192
Two years before current fiscal year, charge-offs	6,856
Three years before current fiscal year, charge-offs	1,655
Four years before current fiscal year, charge-offs	1,933
Prior, charge-offs	355
Revolving loans amortized cost basis, charge-offs	0
Revolving loans converted to term, charge-offs	0
Loans and leases receivable, charge-offs	16,715
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	494,815		497,952
Loans and leases receivable, charge-offs	0	4
Residential real estate | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	2,825		162,488
Fiscal year before current year	172,735		148,583
Two years before current year	151,709		7,462
Three years before current year	6,924		17,569
Four years before current year	16,290		12,164
Prior	79,027		81,119
Revolving loans amortized cost basis	65,305		68,567
Revolving loans converted to term	0		0
Loans and leases receivable	494,815		497,952
Current year, charge-offs	0
Fiscal year before current year, charge-offs	0
Two years before current fiscal year, charge-offs	0
Three years before current fiscal year, charge-offs	0
Four years before current fiscal year, charge-offs	0
Prior, charge-offs	0
Revolving loans amortized cost basis, charge-offs	0
Revolving loans converted to term, charge-offs	0
Loans and leases receivable, charge-offs	0
Residential real estate | Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	2,825		162,217
Fiscal year before current year	172,464		148,217
Two years before current year	151,252		7,224
Three years before current year	6,690		17,128
Four years before current year	15,856		10,739
Prior	74,745		77,762
Revolving loans amortized cost basis	64,870		67,782
Revolving loans converted to term	0		0
Loans and leases receivable	488,702		491,069
Residential real estate | Consumer | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		271
Fiscal year before current year	271		366
Two years before current year	457		238
Three years before current year	234		441
Four years before current year	434		1,425
Prior	4,282		3,357
Revolving loans amortized cost basis	435		785
Revolving loans converted to term	0		0
Loans and leases receivable	6,113		6,883
Manufactured housing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	43,272		45,076
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		213
Four years before current year	211		103
Prior	43,061		44,760
Revolving loans amortized cost basis	0		0
Revolving loans converted to term	0		0
Loans and leases receivable	43,272		45,076
Current year, charge-offs	0
Fiscal year before current year, charge-offs	0
Two years before current fiscal year, charge-offs	0
Three years before current fiscal year, charge-offs	0
Four years before current fiscal year, charge-offs	0
Prior, charge-offs	0
Revolving loans amortized cost basis, charge-offs	0
Revolving loans converted to term, charge-offs	0
Loans and leases receivable, charge-offs	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		213
Four years before current year	0		103
Prior	40,173		41,918
Revolving loans amortized cost basis	0		0
Revolving loans converted to term	0		0
Loans and leases receivable	40,173		42,234
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	211		0
Prior	2,888		2,842
Revolving loans amortized cost basis	0		0
Revolving loans converted to term	0		0
Loans and leases receivable	3,099		2,842
Installment
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable	1,268,505		1,377,939
Loans and leases receivable, charge-offs	16,715	$ 8,865
Installment | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	38,376		790,863
Fiscal year before current year	607,984		310,085
Two years before current year	341,987		101,196
Three years before current year	106,287		101,681
Four years before current year	104,325		8,491
Prior	9,090		841
Revolving loans amortized cost basis	60,456		64,782
Revolving loans converted to term	0		0
Loans and leases receivable	1,268,505		1,377,939
Current year, charge-offs	1,724
Fiscal year before current year, charge-offs	4,192
Two years before current fiscal year, charge-offs	6,856
Three years before current fiscal year, charge-offs	1,655
Four years before current fiscal year, charge-offs	1,933
Prior, charge-offs	355
Revolving loans amortized cost basis, charge-offs	0
Revolving loans converted to term, charge-offs	0
Loans and leases receivable, charge-offs	16,715
Installment | Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	38,376		785,699
Fiscal year before current year	602,558		305,729
Two years before current year	338,980		100,173
Three years before current year	105,550		100,570
Four years before current year	103,290		8,430
Prior	8,934		782
Revolving loans amortized cost basis	60,349		64,690
Revolving loans converted to term	0		0
Loans and leases receivable	1,258,037		1,366,073
Installment | Consumer | Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year	0		5,164
Fiscal year before current year	5,426		4,356
Two years before current year	3,007		1,023
Three years before current year	737		1,111
Four years before current year	1,035		61
Prior	156		59
Revolving loans amortized cost basis	107		92
Revolving loans converted to term	0		0
Loans and leases receivable	$ 10,468		$ 11,866

X

- Definition

Financing Receivable, Excluding Accrued Interest, Originated, More Than Five Years Before Current Fiscal Year, Writeoff

+ References

No definition available.

+ Details

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- Definition

Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Writeoff

+ References

No definition available.

+ Details

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X

- Definition

Financing Receivable, Excluding Accrued Interest, Revolving, Writeoff

+ References

No definition available.

+ Details

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Namespace Prefix:	cubi_
Data Type:	xbrli:monetaryItemType
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