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, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		$ 13,127,634	$ 11,963,855
Current year, charge-offs		3,109	9,211
Fiscal year before current year, charge-offs		11,556	24,986
Two years before current fiscal year, charge-offs		28,540	27,153
Three years before current fiscal year, charge-offs		20,076	15,938
Four years before current fiscal year, charge-offs		5,385	6,821
Prior, charge-offs		15,799	10,957
Revolving loans amortized cost basis, charge-offs		0	0
Revolving loans converted to term, charge-offs		0	0
Charge-offs		84,465	95,066	$ 77,196
Current year		3,062,945	1,570,977
Fiscal year before current year		353,789	400,268
Two years before current year		2,050,813	1,843,180
Three years before current year		1,236,906	1,173,759
Four years before current year		492,198	347,230
Prior		1,178,057	634,860
Revolving loans amortized cost basis		3,670,879	1,521,513
Revolving loans converted to term		1,059,296	4,397,333
Total loans and leases		13,104,883	11,889,120
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]
Charge-offs		5,000	10,700
Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		11,884,299	10,565,824
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Loans and leases receivable		1,243,335	1,398,031
Commercial loans and leases receivable \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		2,930,794	1,291,772
Fiscal year before current year		872,270	3,911,891
Two years before current year		3,249,006	1,228,524
Three years before current year		954,517	577,273
Four years before current year		453,986	290,649
Prior		1,094,132	1,056,227
Revolving loans amortized cost basis		1,953,059	1,734,485
Revolving loans converted to term		353,784	400,268
Loans and leases receivable		11,861,548	10,491,089
Current year, charge-offs		312	1,483
Fiscal year before current year, charge-offs		2,765	381
Two years before current fiscal year, charge-offs		5,833	3,169
Three years before current fiscal year, charge-offs		4,865	10,348
Four years before current fiscal year, charge-offs		2,574	24
Prior, charge-offs		11,969	9,650
Revolving loans amortized cost basis, charge-offs		0	0
Revolving loans converted to term, charge-offs		0	0
Charge-offs		28,318	25,055
Commercial and industrial, including specialized lending
Financing Receivable, Credit Quality Indicator [Line Items]
Charge-offs		23,735	16,915	16,248
Total loans and leases		7,002,019	6,211,105
Commercial and industrial, including specialized lending \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		2,120,055	1,217,661
Fiscal year before current year		740,087	1,952,227
Two years before current year		1,328,847	549,699
Three years before current year		346,115	199,030
Four years before current year		112,018	64,016
Prior		68,899	106,137
Revolving loans amortized cost basis		1,943,454	1,734,485
Revolving loans converted to term		342,544	387,850
Loans and leases receivable		7,002,019	6,211,105
Current year, charge-offs		312	1,483
Fiscal year before current year, charge-offs		2,765	381
Two years before current fiscal year, charge-offs		5,833	3,169
Three years before current fiscal year, charge-offs		4,865	10,348
Four years before current fiscal year, charge-offs		2,429	24
Prior, charge-offs		7,531	1,510
Revolving loans amortized cost basis, charge-offs		0	0
Revolving loans converted to term, charge-offs		0	0
Charge-offs		23,735	16,915
Commercial and industrial, including specialized lending \| Pass \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		2,103,150	1,184,923
Fiscal year before current year		738,456	1,909,592
Two years before current year		1,278,246	483,039
Three years before current year		333,068	170,384
Four years before current year		107,840	59,213
Prior		6,742	63,480
Revolving loans amortized cost basis		1,907,480	1,722,559
Revolving loans converted to term		336,100	384,947
Loans and leases receivable		6,811,082	5,978,137
Commercial and industrial, including specialized lending \| Special Mention \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		16,905	18,000
Fiscal year before current year		0	3,377
Two years before current year		6,933	5,127
Three years before current year		1,522	1,986
Four years before current year		0	0
Prior		62	595
Revolving loans amortized cost basis		8,144	7,916
Revolving loans converted to term		3,630	2,903
Loans and leases receivable		37,196	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		1,631	39,258
Two years before current year		43,668	61,533
Three years before current year		11,525	26,660
Four years before current year		4,178	4,803
Prior		62,095	42,062
Revolving loans amortized cost basis		27,830	4,010
Revolving loans converted to term		2,814	0
Loans and leases receivable		153,741	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]
Charge-offs		4,073	3,574	1,990
Total loans and leases		2,252,246	2,138,622
Multifamily \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		235,685	845
Fiscal year before current year		813	1,229,198
Two years before current year		1,196,411	371,016
Three years before current year		300,148	127,493
Four years before current year		124,779	49,514
Prior		394,410	360,556
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		2,252,246	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		4,073	3,574
Revolving loans amortized cost basis, charge-offs		0	0
Revolving loans converted to term, charge-offs		0	0
Charge-offs		4,073	3,574
Multifamily \| Pass \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		235,685	845
Fiscal year before current year		813	1,229,198
Two years before current year		1,182,371	371,016
Three years before current year		288,055	127,493
Four years before current year		124,779	43,046
Prior		314,967	253,806
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		2,146,670	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		14,040	0
Three years before current year		12,093	0
Four years before current year		0	6,468
Prior		32,316	67,035
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		58,449	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		47,127	39,715
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		47,127	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
Financing Receivable, Credit Quality Indicator [Line Items]
Charge-offs		365	39	0
Total loans and leases		1,100,944	797,319
Commercial real estate owner occupied \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		395,522	41,011
Fiscal year before current year		57,300	254,878
Two years before current year		212,162	195,721
Three years before current year		211,598	77,821
Four years before current year		52,078	80,420
Prior		153,439	136,150
Revolving loans amortized cost basis		7,605	0
Revolving loans converted to term		11,240	11,318
Loans and leases receivable		1,100,944	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		365	39
Revolving loans amortized cost basis, charge-offs		0	0
Revolving loans converted to term, charge-offs		0	0
Charge-offs		365	39
Commercial real estate owner occupied \| Pass \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		395,522	41,011
Fiscal year before current year		54,356	254,878
Two years before current year		211,300	180,289
Three years before current year		195,169	77,821
Four years before current year		42,078	44,382
Prior		118,677	120,248
Revolving loans amortized cost basis		7,605	0
Revolving loans converted to term		104	11,318
Loans and leases receivable		1,024,811	729,947
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		159	15,432
Three years before current year		16,429	0
Four years before current year		10,000	35,691
Prior		15,885	47
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		11,136	0
Loans and leases receivable		53,609	51,170
Commercial real estate owner occupied \| 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		703	0
Three years before current year		0	0
Four years before current year		0	347
Prior		18,877	15,855
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		22,524	16,202
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]
Charge-offs		145	4,527	6,075
Total loans and leases		1,359,130	1,177,650
Commercial real estate non-owner occupied \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		163,429	12,906
Fiscal year before current year		42,367	336,791
Two years before current year		416,629	109,521
Three years before current year		96,656	172,929
Four years before current year		165,111	96,699
Prior		472,938	448,804
Revolving loans amortized cost basis		2,000	0
Revolving loans converted to term		0	0
Loans and leases receivable		1,359,130	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		145	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
Charge-offs		145	4,527
Commercial real estate non-owner occupied \| Pass \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		163,429	12,906
Fiscal year before current year		30,367	325,881
Two years before current year		412,352	109,521
Three years before current year		96,656	152,227
Four years before current year		165,111	88,586
Prior		413,336	367,996
Revolving loans amortized cost basis		2,000	0
Revolving loans converted to term		0	0
Loans and leases receivable		1,283,251	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		12,000	0
Two years before current year		4,277	0
Three years before current year		0	20,702
Four years before current year		0	0
Prior		431	9,148
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		16,708	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		59,171	71,660
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		59,171	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
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]
Charge-offs		0	0	0
Total loans and leases		147,209	166,393
Construction \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		16,103	19,349
Fiscal year before current year		31,703	138,797
Two years before current year		94,957	2,567
Three years before current year		0	0
Four years before current year		0	0
Prior		4,446	4,580
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	1,100
Loans and leases receivable		147,209	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
Charge-offs		0	0
Construction \| Pass \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		16,103	17,594
Fiscal year before current year		22,610	138,797
Two years before current year		94,957	2,567
Three years before current year		0	0
Four years before current year		0	0
Prior		4,446	4,580
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	1,100
Loans and leases receivable		138,116	164,638
Construction \| Special Mention \| Commercial
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		0	1,755
Fiscal year before current year		9,093	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		9,093	1,755
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		132,151	279,205
Fiscal year before current year		187,026	485,442
Two years before current year		421,873	292,989
Three years before current year		223,540	57,587
Four years before current year		38,212	56,581
Prior		142,774	117,532
Revolving loans amortized cost basis		97,754	108,695
Revolving loans converted to term		5	0
Loans and leases receivable		1,243,335	1,398,031
Current year, charge-offs		2,797	7,728
Fiscal year before current year, charge-offs		8,791	24,605
Two years before current fiscal year, charge-offs		22,707	23,984
Three years before current fiscal year, charge-offs		15,211	5,590
Four years before current fiscal year, charge-offs		2,811	6,797
Prior, charge-offs		3,830	1,307
Revolving loans amortized cost basis, charge-offs		0	0
Revolving loans converted to term, charge-offs		0	0
Charge-offs		56,147	70,011
Residential real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Charge-offs		38	69	17
Total loans and leases		496,559	484,435
Residential real estate \| Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		45,895	22,613
Fiscal year before current year		20,974	173,774
Two years before current year		164,398	132,857
Three years before current year		124,247	6,687
Four years before current year		6,144	16,053
Prior		83,414	75,426
Revolving loans amortized cost basis		51,487	57,025
Revolving loans converted to term		0	0
Loans and leases receivable		496,559	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		38	69
Revolving loans amortized cost basis, charge-offs		0	0
Revolving loans converted to term, charge-offs		0	0
Charge-offs		38	69
Residential real estate \| Consumer \| Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		45,757	22,613
Fiscal year before current year		20,701	173,424
Two years before current year		163,473	131,621
Three years before current year		123,170	6,458
Four years before current year		5,827	15,508
Prior		77,989	71,433
Revolving loans amortized cost basis		50,807	56,844
Revolving loans converted to term		0	0
Loans and leases receivable		487,724	477,901
Residential real estate \| Consumer \| Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Current year		138	0
Fiscal year before current year		273	350
Two years before current year		925	1,236
Three years before current year		1,077	229
Four years before current year		317	545
Prior		5,425	3,993
Revolving loans amortized cost basis		680	181
Revolving loans converted to term		0	0
Loans and leases receivable		8,835	6,534
Manufactured housing
Financing Receivable, Credit Quality Indicator [Line Items]
Charge-offs		0	0	0
Total loans and leases		33,123	38,670
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		33,123	38,572
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		33,123	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
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		31,570	36,464
Revolving loans amortized cost basis		0	0
Revolving loans converted to term		0	0
Loans and leases receivable		31,570	36,562
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		1,553	2,108

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

No definition available.

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Period Type:	duration

- Definition

Financing Receivable, Excluding Accrued Interest, Before Allowance For Credit Loss, Excluding Paycheck Protection Loans

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Financing Receivable, Excluding Accrued Interest, Originated, More than Five Years before Current Fiscal Year, Excluding Paycheck Protection Loans

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Financing Receivable, Excluding Accrued Interest, Revolving, Converted to Term Loan, Excluding Paycheck Protection Loans

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Financing Receivable, Excluding Accrued Interest, Revolving, Excluding Paycheck Protection Loans

+ References

No definition available.

+ Details

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Namespace Prefix:	cubi_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Financing Receivable, Excluding Accrued Interest, Year Five, Originated, Four Years before Current Fiscal Year, Excluding Paycheck Protection Loans

+ References

No definition available.

+ Details

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Amortized cost excluding accrued interest, of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease.

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Amortized cost excluding accrued interest, of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease.

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Amortized cost excluding accrued interest, of financing receivable originated in current fiscal year. Excludes net investment in lease.

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Amortized cost excluding accrued interest, of financing receivable originated two years prior to current fiscal year. Excludes net investment in lease.

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Amortized cost excluding accrued interest of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease.

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Amount, excluding accrued interest, of writeoff of financing receivable originated in fiscal year before current fiscal year. Excludes net investment in lease.

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