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Loans Receivable and Allowance for Loan Losses - Schedule of FDIC Loss Sharing Receivable (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Banking and Thrift [Abstract]                      
Beginning Balance       $ 10,046us-gaap_FDICIndemnificationAsset       $ 12,343us-gaap_FDICIndemnificationAsset $ 10,046us-gaap_FDICIndemnificationAsset $ 12,343us-gaap_FDICIndemnificationAsset $ 13,077us-gaap_FDICIndemnificationAsset
Increased (decreased) estimated cash flows                 (4,689)us-gaap_FDICIndemnificationAssetPeriodIncreaseDecrease 2,819us-gaap_FDICIndemnificationAssetPeriodIncreaseDecrease 2,001us-gaap_FDICIndemnificationAssetPeriodIncreaseDecrease
Other activity, net 2,409cubi_FdicIndemnificationAssetOther       1,610cubi_FdicIndemnificationAssetOther       2,409cubi_FdicIndemnificationAssetOther 1,610cubi_FdicIndemnificationAssetOther 3,838cubi_FdicIndemnificationAssetOther
Cash receipts from FDIC                 (5,446)us-gaap_FDICIndemnificationAssetCashPaymentsReceived (6,726)us-gaap_FDICIndemnificationAssetCashPaymentsReceived (6,573)us-gaap_FDICIndemnificationAssetCashPaymentsReceived
Ending Balance 2,320us-gaap_FDICIndemnificationAsset       10,046us-gaap_FDICIndemnificationAsset       2,320us-gaap_FDICIndemnificationAsset 10,046us-gaap_FDICIndemnificationAsset 12,343us-gaap_FDICIndemnificationAsset
Provision for Loan, Lease, and Other Losses                 10,058us-gaap_ProvisionForLoanLeaseAndOtherLosses 5,055us-gaap_ProvisionForLoanLeaseAndOtherLosses 16,271us-gaap_ProvisionForLoanLeaseAndOtherLosses
Effect attributable to FDIC loss share arrangements                 4,689us-gaap_FDICIndemnificationAssetPeriodIncreaseDecrease (2,819)us-gaap_FDICIndemnificationAssetPeriodIncreaseDecrease (2,001)us-gaap_FDICIndemnificationAssetPeriodIncreaseDecrease
Provision for loan losses $ 2,459us-gaap_ProvisionForLoanAndLeaseLosses $ 5,035us-gaap_ProvisionForLoanAndLeaseLosses $ 2,886us-gaap_ProvisionForLoanAndLeaseLosses $ 4,368us-gaap_ProvisionForLoanAndLeaseLosses $ (512)us-gaap_ProvisionForLoanAndLeaseLosses $ 750us-gaap_ProvisionForLoanAndLeaseLosses $ 2,116us-gaap_ProvisionForLoanAndLeaseLosses $ (118)us-gaap_ProvisionForLoanAndLeaseLosses $ 14,747us-gaap_ProvisionForLoanAndLeaseLosses $ 2,236us-gaap_ProvisionForLoanAndLeaseLosses $ 14,270us-gaap_ProvisionForLoanAndLeaseLosses