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Deposits (Summary of Average Balances and Weighted Average Rates Paid on Deposits) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Demand deposits:      
Non-interest bearing, Average Balance $ 2,366,621bku_NoninterestBearingDepositLiabilitiesDomesticAverageBalance $ 1,586,007bku_NoninterestBearingDepositLiabilitiesDomesticAverageBalance $ 1,099,448bku_NoninterestBearingDepositLiabilitiesDomesticAverageBalance
Interest bearing, Average Balance 773,655bku_InterestBearingDepositLiabilitiesDomesticAverageBalance 582,623bku_InterestBearingDepositLiabilitiesDomesticAverageBalance 504,614bku_InterestBearingDepositLiabilitiesDomesticAverageBalance
Non-interest bearing, Average Rate (in Percent) 0.00%bku_WeightedAverageRateNonInterestBearingDomesticDeposit 0.00%bku_WeightedAverageRateNonInterestBearingDomesticDeposit 0.00%bku_WeightedAverageRateNonInterestBearingDomesticDeposit
Interest-bearing, Average Rate (in Percent) 0.42%bku_WeightedAverageRateInterestBearingDomesticDeposit 0.46%bku_WeightedAverageRateInterestBearingDomesticDeposit 0.63%bku_WeightedAverageRateInterestBearingDomesticDeposit
Money market, Average Balance 4,444,753bku_DepositsMoneyMarketDepositsAverageBalance 3,403,276bku_DepositsMoneyMarketDepositsAverageBalance 2,838,735bku_DepositsMoneyMarketDepositsAverageBalance
Savings, Average Balance 647,691bku_DepositsSavingsDepositsAverageBalance 877,255bku_DepositsSavingsDepositsAverageBalance 1,073,709bku_DepositsSavingsDepositsAverageBalance
Time, Average Balance 3,716,611bku_TimeDepositsAverageBalance 2,844,377bku_TimeDepositsAverageBalance 2,632,451bku_TimeDepositsAverageBalance
Total, Average Balance $ 11,949,331bku_DepositsAverageBalance $ 9,293,538bku_DepositsAverageBalance $ 8,148,957bku_DepositsAverageBalance
Money market, Average Rate (in Percent) 0.54%us-gaap_WeightedAverageRateDomesticDepositMoneyMarket 0.51%us-gaap_WeightedAverageRateDomesticDepositMoneyMarket 0.63%us-gaap_WeightedAverageRateDomesticDepositMoneyMarket
Savings, Average Rate (in Percent) 0.30%us-gaap_WeightedAverageRateDomesticDepositSavings 0.37%us-gaap_WeightedAverageRateDomesticDepositSavings 0.58%us-gaap_WeightedAverageRateDomesticDepositSavings
Time, Average Rate (in Percent) 1.18%us-gaap_WeightedAverageRateDomesticDepositTimeDeposits 1.31%us-gaap_WeightedAverageRateDomesticDepositTimeDeposits 1.48%us-gaap_WeightedAverageRateDomesticDepositTimeDeposits
Total, Average Rate (in Percent) 0.61%us-gaap_WeightedAverageRateDomesticDeposit 0.65%us-gaap_WeightedAverageRateDomesticDeposit 0.81%us-gaap_WeightedAverageRateDomesticDeposit