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Note 8 - Borrowings (Details Textual) - USD ($)
1 Months Ended 12 Months Ended
Jun. 10, 2008
Jun. 28, 2007
Dec. 31, 2006
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Maximum Percentage of Capital Permitted to Invest in Trust Preferred Securities       25.00%    
Proceeds from Issuance of Common Stock $ 300,000     $ 99,175,000
Amortization of Debt Issuance Costs       29,000 24,000 $ 24,000
Subordinated Debt [Member]            
Debt Issuance Costs, Net       $ 555,000 $ 595,000  
Director [Member]            
Debt Conversion, Converted Instrument, Shares Issued       37,000    
Debt Conversion, Original Debt, Amount       $ 240,000    
Republic Capital Trust II [Member]            
Proceeds from (Repurchase of) Trust Preferred Securities     $ 6,000,000      
Proceeds from Issuance of Common Stock     200,000      
Republic Capital Trust II [Member] | Junior Subordinated Debt [Member]            
Proceeds from Issuance of Subordinated Long-term Debt     $ 6,200,000      
Republic Capital Trust II [Member] | Junior Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate     1.73%      
Republic Capital Trust III [Member]            
Proceeds from (Repurchase of) Trust Preferred Securities   $ 5,000,000        
Proceeds from Issuance of Common Stock   200,000        
Republic Capital Trust III [Member] | Junior Subordinated Debt [Member]            
Proceeds from Issuance of Subordinated Long-term Debt   $ 5,200,000        
Republic Capital Trust III [Member] | Junior Subordinated Debt [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate   1.55%        
Republic Capital Trust IV [Member]            
Proceeds from (Repurchase of) Trust Preferred Securities 10,800,000          
Debt Conversion, Converted Instrument, Shares Issued         1,700,000  
Debt Instrument, Convertible, Conversion Price         $ 6.50  
Republic Capital Trust IV [Member] | Junior Subordinated Debt [Member]            
Proceeds from Issuance of Subordinated Long-term Debt $ 11,100,000          
Debt Instrument, Interest Rate, Stated Percentage 8.00%          
Overnight Advances [Member]            
Collateralized Financings       814,900,000    
Correspondent Bank [Member]            
Line of Credit Facility, Maximum Borrowing Capacity       10,000,000    
Long-term Line of Credit       0 $ 0  
Line of Credit Facility, Maximum Amount Outstanding During Period       0 0  
Federal Home Loan Bank of Pittsburgh [Member]            
Line of Credit Facility, Maximum Borrowing Capacity       576,500,000    
Letters of Credit Outstanding, Amount       75,000,000    
Federal Home Loan Bank of Pittsburgh [Member] | Overnight Advances [Member]            
Long-term Line of Credit       0 0  
Federal Home Loan Bank, Advances, Activity for Year, Maximum Outstanding at any Month End       $ 82,900,000 $ 48,800,000