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Other Borrowed Funds and Subordinated Debentures (Details Textual) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Dec. 31, 2012
Subordinated Debt [Member]
Jan. 10, 2005
Subordinated Debt [Member]
Dec. 31, 2004
Subordinated Debt [Member]
Century Bancorp Capital Trust II [Member]
Dec. 31, 2012
Subordinated Debt [Member]
Century Bancorp Capital Trust II [Member]
Dec. 31, 2012
Other Borrowed Funds [Member]
Dec. 31, 2011
Other Borrowed Funds [Member]
Dec. 31, 2012
Federal Home Loan Bank Borrowings [Member]
Dec. 31, 2012
Cumulative Preferred Stock Subject to Mandatory Redemption [Member]
Subordinated Debt [Member]
Dec. 31, 2012
Cumulative Preferred Stock Subject to Mandatory Redemption [Member]
Subordinated Debt [Member]
Century Bancorp Capital Trust II [Member]
Other Borrowed Funds and Subordinated Debentures (Textual) [Abstract]                        
Bank's remaining term borrowing capacity at the FHLBB                   $ 280,598,000    
Line of credit with the FHLBB                   14,500,000    
Subordinated debentures issued for new Unconsolidated subsidiary       29,639,000                
Subordinated debt securities due year       2029   2034            
Shares of Cumulative Trust Preferred Securities                     2,875,000 35,000
Liquidation value of shares of Cumulative Trust Preferred Securities       $ 10     $ 1,000          
Outstanding loan               144,000 143,000      
Trust Preferred Securities annual dividend rate                     8.30% 6.65%
Percentage of preferred trust securities         8.30%              
Subordinated debt securities issued 36,083,000   36,083,000     36,083,000            
Period of dividend             10 years          
LIBOR rate             three-month LIBOR rate plus 1.87% for the remaining 20 years          
LIBOR rate Trust Preferred Securities             1.87%          
Duration of LIBOR rate             20 years          
Federal funds purchased               0 0      
Other Borrowed Funds and Subordinated Debentures (Additional Textual) [Abstract]                        
FHLLB Advances 35,000,000 35,000,000 35,000,000                  
Restructuring of FHLBB advances $ 18,000,000 $ 12,500,000                    
Weighted average rate of Restructured FHLBB advances 4.45% 2.40%                    
Weighted average remaining maturity period of FHLB 25 months 21 months                    
Weighted average rate subsequent to Restructured of FHLBB advances 3.50% 2.52%                    
Weighted average remaining maturity subsequent to Restructured FHLBB advances 60 months 57 months