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Other Real Estate Owned (Schedule of OREO, Roll Forward) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Real Estate [Roll Forward]      
Beginning Balance $ 40,570us-gaap_RealEstateAcquiredThroughForeclosure $ 76,022us-gaap_RealEstateAcquiredThroughForeclosure $ 123,737us-gaap_RealEstateAcquiredThroughForeclosure
Transfers from loan portfolio 26,564us-gaap_TransferToOtherRealEstate 68,084us-gaap_TransferToOtherRealEstate 151,302us-gaap_TransferToOtherRealEstate
Sales (52,119)bku_OtherRealEstateCoveredandNonCoveredDisposals (101,597)bku_OtherRealEstateCoveredandNonCoveredDisposals (189,091)bku_OtherRealEstateCoveredandNonCoveredDisposals
Impairment (1,235)bku_OtherRealEstateCoveredandNonCoveredPeriodIncreaseDecrease (1,939)bku_OtherRealEstateCoveredandNonCoveredPeriodIncreaseDecrease (9,926)bku_OtherRealEstateCoveredandNonCoveredPeriodIncreaseDecrease
Ending Balance $ 13,780us-gaap_RealEstateAcquiredThroughForeclosure $ 40,570us-gaap_RealEstateAcquiredThroughForeclosure $ 76,022us-gaap_RealEstateAcquiredThroughForeclosure