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FDIC Indemnification Asset (Changes in the FDIC Indemnification Asset) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
FDIC Indemnification Asset [Roll Forward]      
FDIC Indemnification Asset and Liability, net $ 1,205,117bku_FDICIndemnificationAssetandLiabilitynet $ 1,457,570bku_FDICIndemnificationAssetandLiabilitynet $ 2,049,151bku_FDICIndemnificationAssetandLiabilitynet
Amortization (69,470)bku_FDICIndemnificationAssetAmortization (36,943)bku_FDICIndemnificationAssetAmortization 15,306bku_FDICIndemnificationAssetAmortization
Reduction for claims filed (114,916)bku_ReductionForClaimsFiled (164,872)bku_ReductionForClaimsFiled (600,857)bku_ReductionForClaimsFiled
Net loss on FDIC indemnification (46,396)bku_GainLossOnIndemnificationAsset (50,638)bku_GainLossOnIndemnificationAsset (6,030)bku_GainLossOnIndemnificationAsset
FDIC Indemnification Asset and Liability, net 974,335bku_FDICIndemnificationAssetandLiabilitynet 1,205,117bku_FDICIndemnificationAssetandLiabilitynet 1,457,570bku_FDICIndemnificationAssetandLiabilitynet
FDIC indemnification asset 974,704us-gaap_FDICIndemnificationAsset 1,205,117us-gaap_FDICIndemnificationAsset  
Other Liabilities $ (369)bku_FDICIndemnificationLiability