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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Credit Ratings (Details) - USD ($) $ in Thousands		12 Months Ended
	Jun. 15, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		$ 1,570,977	$ 6,146,506
Fiscal year before current year		4,397,333	1,911,220
Two years before current year		1,521,513	803,531
Three years before current year		634,860	570,940
Four years before current year		347,230	322,745
Prior		1,173,759	1,176,989
Revolving loans amortized cost basis		1,843,180	2,212,963
Revolving loans converted to term		400,268	0
Loans and leases receivable		11,889,120	13,144,894
Current year, charge-offs		9,211
Fiscal year before current year, charge-offs		24,986
Two years before current fiscal year, charge-offs		27,153
Three years before current fiscal year, charge-offs		15,938
Four years before current fiscal year, charge-offs		6,821
Prior, charge-offs		10,957
Revolving loans amortized cost basis, charge-offs		0
Revolving loans converted to term, charge-offs		0
Charge-offs		95,066	77,196	$ 40,381
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		74,700	998,200
Charge-offs		10,700	11,000
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		10,491,089	11,223,927
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		1,398,031	1,920,967
Commercial loans and leases receivable | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		1,291,772	5,193,155
Fiscal year before current year		3,911,891	1,452,552
Two years before current year		1,228,524	694,873
Three years before current year		577,273	451,477
Four years before current year		290,649	301,987
Prior		1,056,227	1,050,269
Revolving loans amortized cost basis		1,734,485	2,079,614
Revolving loans converted to term		400,268	0
Loans and leases receivable		10,491,089	11,223,927
Current year, charge-offs		1,483
Fiscal year before current year, charge-offs		381
Two years before current fiscal year, charge-offs		3,169
Three years before current fiscal year, charge-offs		10,348
Four years before current fiscal year, charge-offs		24
Prior, charge-offs		9,650
Revolving loans amortized cost basis, charge-offs		0
Revolving loans converted to term, charge-offs		0
Charge-offs		25,055
Commercial and industrial, including specialty lending
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		6,211,105	6,672,830
Charge-offs		16,915	16,248	1,550
Commercial and industrial, including specialty lending | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		1,217,661	3,217,384
Fiscal year before current year		1,952,227	711,072
Two years before current year		549,699	271,263
Three years before current year		199,030	207,297
Four years before current year		64,016	64,786
Prior		106,137	123,143
Revolving loans amortized cost basis		1,734,485	2,077,885
Revolving loans converted to term		387,850	0
Loans and leases receivable		6,211,105	6,672,830
Current year, charge-offs		1,483
Fiscal year before current year, charge-offs		381
Two years before current fiscal year, charge-offs		3,169
Three years before current fiscal year, charge-offs		10,348
Four years before current fiscal year, charge-offs		24
Prior, charge-offs		1,510
Revolving loans amortized cost basis, charge-offs		0
Revolving loans converted to term, charge-offs		0
Charge-offs		16,915
Commercial and industrial, including specialty lending | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		1,184,923	3,206,250
Fiscal year before current year		1,909,592	682,132
Two years before current year		483,039	242,516
Three years before current year		170,384	198,866
Four years before current year		59,213	56,572
Prior		63,480	83,417
Revolving loans amortized cost basis		1,722,559	2,066,349
Revolving loans converted to term		384,947	0
Loans and leases receivable		5,978,137	6,536,102
Commercial and industrial, including specialty lending | Special Mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		18,000	11,134
Fiscal year before current year		3,377	6,023
Two years before current year		5,127	27,780
Three years before current year		1,986	0
Four years before current year		0	1,501
Prior		595	172
Revolving loans amortized cost basis		7,916	2,599
Revolving loans converted to term		2,903	0
Loans and leases receivable		39,904	49,209
Commercial and industrial, including specialty lending | Substandard | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		14,738	0
Fiscal year before current year		39,258	22,917
Two years before current year		61,533	967
Three years before current year		26,660	8,431
Four years before current year		4,803	6,713
Prior		42,062	39,554
Revolving loans amortized cost basis		4,010	8,937
Revolving loans converted to term		0	0
Loans and leases receivable		193,064	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		2,138,622	2,213,019
Charge-offs		3,574	1,990	1,132
Multifamily | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		845	1,260,544
Fiscal year before current year		1,229,198	365,547
Two years before current year		371,016	130,656
Three years before current year		127,493	22,167
Four years before current year		49,514	117,171
Prior		360,556	316,934
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		2,138,622	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		3,574
Revolving loans amortized cost basis, charge-offs		0
Revolving loans converted to term, charge-offs		0
Charge-offs		3,574
Multifamily | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		845	1,260,544
Fiscal year before current year		1,229,198	364,047
Two years before current year		371,016	130,656
Three years before current year		127,493	22,167
Four years before current year		43,046	112,212
Prior		253,806	203,215
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		2,025,404	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		6,468	4,959
Prior		67,035	50,858
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		73,503	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		0	0
Three years before current year		0	0
Four years before current year		0	0
Prior		39,715	62,861
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		39,715	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		797,319	885,339
Charge-offs		39	0	749
Commercial real estate owner occupied | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		41,011	293,096
Fiscal year before current year		254,878	220,515
Two years before current year		195,721	105,925
Three years before current year		77,821	90,886
Four years before current year		80,420	44,899
Prior		136,150	130,018
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		11,318	0
Loans and leases receivable		797,319	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		39
Revolving loans amortized cost basis, charge-offs		0
Revolving loans converted to term, charge-offs		0
Charge-offs		39
Commercial real estate owner occupied | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		41,011	293,096
Fiscal year before current year		254,878	220,515
Two years before current year		180,289	105,925
Three years before current year		77,821	90,752
Four years before current year		44,382	34,196
Prior		120,248	121,616
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		11,318	0
Loans and leases receivable		729,947	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		15,432	0
Three years before current year		0	0
Four years before current year		35,691	134
Prior		47	1,841
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		51,170	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		347	10,569
Prior		15,855	6,561
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		16,202	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	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		1,177,650	1,290,730
Charge-offs		4,527	6,075	944
Commercial real estate non-owner occupied | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		12,906	349,954
Fiscal year before current year		336,791	119,304
Two years before current year		109,521	177,492
Three years before current year		172,929	102,483
Four years before current year		96,699	70,435
Prior		448,804	471,062
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		1,177,650	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		4,527
Revolving loans amortized cost basis, charge-offs		0
Revolving loans converted to term, charge-offs		0
Charge-offs		4,527
Commercial real estate non-owner occupied | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		12,906	339,044
Fiscal year before current year		325,881	119,304
Two years before current year		109,521	156,281
Three years before current year		152,227	73,827
Four years before current year		88,586	62,237
Prior		367,996	386,235
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		1,057,117	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		20,702	0
Four years before current year		0	0
Prior		9,148	10,617
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		29,850	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		8,113	8,198
Prior		71,660	74,210
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		90,683	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
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		166,393	162,009
Charge-offs		0	0	0
Construction | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		19,349	72,177
Fiscal year before current year		138,797	36,114
Two years before current year		2,567	9,537
Three years before current year		0	28,644
Four years before current year		0	4,696
Prior		4,580	9,112
Revolving loans amortized cost basis		0	1,729
Revolving loans converted to term		1,100	0
Loans and leases receivable		166,393	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
Charge-offs		0
Construction | Pass | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		17,594	72,177
Fiscal year before current year		138,797	36,114
Two years before current year		2,567	9,537
Three years before current year		0	28,644
Four years before current year		0	4,696
Prior		4,580	9,112
Revolving loans amortized cost basis		0	1,729
Revolving loans converted to term		1,100	0
Loans and leases receivable		164,638	162,009
Construction | Special Mention | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		1,755	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		1,755	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		279,205	953,351
Fiscal year before current year		485,442	458,668
Two years before current year		292,989	108,658
Three years before current year		57,587	119,463
Four years before current year		56,581	20,758
Prior		117,532	126,720
Revolving loans amortized cost basis		108,695	133,349
Revolving loans converted to term		0	0
Loans and leases receivable		1,398,031	1,920,967
Current year, charge-offs		7,728
Fiscal year before current year, charge-offs		24,605
Two years before current fiscal year, charge-offs		23,984
Three years before current fiscal year, charge-offs		5,590
Four years before current fiscal year, charge-offs		6,797
Prior, charge-offs		1,307
Revolving loans amortized cost basis, charge-offs		0
Revolving loans converted to term, charge-offs		0
Charge-offs		70,011
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		484,435	497,952
Charge-offs		69	17	130
Residential real estate | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		22,613	162,488
Fiscal year before current year		173,774	148,583
Two years before current year		132,857	7,462
Three years before current year		6,687	17,569
Four years before current year		16,053	12,164
Prior		75,426	81,119
Revolving loans amortized cost basis		57,025	68,567
Revolving loans converted to term		0	0
Loans and leases receivable		484,435	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		69
Revolving loans amortized cost basis, charge-offs		0
Revolving loans converted to term, charge-offs		0
Charge-offs		69
Residential real estate | Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		22,613	162,217
Fiscal year before current year		173,424	148,217
Two years before current year		131,621	7,224
Three years before current year		6,458	17,128
Four years before current year		15,508	10,739
Prior		71,433	77,762
Revolving loans amortized cost basis		56,844	67,782
Revolving loans converted to term		0	0
Loans and leases receivable		477,901	491,069
Residential real estate | Consumer | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	271
Fiscal year before current year		350	366
Two years before current year		1,236	238
Three years before current year		229	441
Four years before current year		545	1,425
Prior		3,993	3,357
Revolving loans amortized cost basis		181	785
Revolving loans converted to term		0	0
Loans and leases receivable		6,534	6,883
Manufactured housing
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		38,670	45,076
Charge-offs		0	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		98	103
Prior		38,572	44,760
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		38,670	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
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		98	103
Prior		36,464	41,918
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		36,562	42,234
Manufactured housing | Consumer | Nonperforming
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		2,108	2,842
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		2,108	2,842
Installment
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		874,926	1,377,939
Charge-offs		69,942	52,866	$ 35,876
Installment | Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		256,592	790,863
Fiscal year before current year		311,668	310,085
Two years before current year		160,132	101,196
Three years before current year		50,900	101,681
Four years before current year		40,430	8,491
Prior		3,534	841
Revolving loans amortized cost basis		51,670	64,782
Revolving loans converted to term		0	0
Loans and leases receivable		874,926	1,377,939
Current year, charge-offs		7,728
Fiscal year before current year, charge-offs		24,605
Two years before current fiscal year, charge-offs		23,984
Three years before current fiscal year, charge-offs		5,590
Four years before current fiscal year, charge-offs		6,797
Prior, charge-offs		1,238
Revolving loans amortized cost basis, charge-offs		0
Revolving loans converted to term, charge-offs		0
Charge-offs		69,942
Installment | Consumer | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		253,958	785,699
Fiscal year before current year		307,566	305,729
Two years before current year		158,381	100,173
Three years before current year		50,354	100,570
Four years before current year		39,953	8,430
Prior		3,448	782
Revolving loans amortized cost basis		51,480	64,690
Revolving loans converted to term		0	0
Loans and leases receivable		865,140	1,366,073
Installment | Consumer | Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		2,634	5,164
Fiscal year before current year		4,102	4,356
Two years before current year		1,751	1,023
Three years before current year		546	1,111
Four years before current year		477	61
Prior		86	59
Revolving loans amortized cost basis		190	92
Revolving loans converted to term		0	0
Loans and leases receivable		9,786	11,866
Specialty lending | Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		$ 5,006,693	$ 5,412,887
Charge-off of certain PCD loans	$ 6,200

X

- Definition

Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase, Excluding Charge-Offs

+ References

No definition available.

+ Details

Name:	cubi_FinancingReceivableAllowanceForCreditLossPurchasedWithCreditDeteriorationIncreaseExcludingChargeOffs
Namespace Prefix:	cubi_
Data Type:	xbrli:monetaryItemType
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