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EARNINGS PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
EARNINGS PER SHARE    
Net income $ 13,788us-gaap_NetIncomeLoss $ 11,984us-gaap_NetIncomeLoss
Weighted average shares outstanding 20,859,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 20,796,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities (in shares) 77,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 97,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Average shares outstanding including dilutive securities 20,936,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 20,893,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings per share:    
Antidilutive stock options (in shares) 14,250us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 15,500us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Average antidilutive stock options (in shares) 14,250rbcaa_AverageAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 15,500rbcaa_AverageAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Class A Common Stock    
EARNINGS PER SHARE    
Cash dividend premium per share (as a percent) 10.00%rbcaa_CommonStockDividendsCashPremium
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Basic earnings per share:    
Basic earnings per share $ 0.66us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 0.58us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Diluted earnings per share:    
Diluted earnings per share $ 0.66us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 0.58us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
Class B Common Stock    
Basic earnings per share:    
Basic earnings per share $ 0.65us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 0.56us-gaap_EarningsPerShareBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Diluted earnings per share:    
Diluted earnings per share $ 0.64us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 0.56us-gaap_EarningsPerShareDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember