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Investments - Carrying value and estimated fair value (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities      
Available-for-sale investment securities, Amortized cost $ 419,372,000 $ 447,108,000 $ 447,108,000
Gross Unrealized Gains 6,098,000 5,145,000  
Gross Unrealized Losses (3,397,000) (9,029,000)  
Available-for-sale investment securities 422,073,000 443,224,000  
Held-to-maturity Securities, Debt Maturities [Abstract]      
Estimated Fair Value 32,047,000    
U.S. Government agencies
      
Schedule of Available-for-sale Securities      
Debt Securities, Amortized Cost 17,968,000 18,172,000  
Gross Unrealized Gains 47,000 115,000  
Gross Unrealized Losses (40,000) (84,000)  
Debt Securities, Estimated Fair Value 17,975,000 18,203,000  
Obligations of states and political subdivisions
      
Schedule of Available-for-sale Securities      
Debt Securities, Amortized Cost 123,678,000 162,018,000  
Gross Unrealized Gains 2,918,000 2,906,000  
Gross Unrealized Losses (2,082,000) (6,517,000)  
Debt Securities, Estimated Fair Value 124,514,000 158,407,000  
Held-to-maturity Securities, Debt Maturities [Abstract]      
Amortized Cost Basis 31,589,000    
Gross Unrealized Gains 504,000    
Gross Unrealized Losses (46,000)    
Estimated Fair Value 32,047,000    
U.S. Government agencies collateralized by residential mortgage obligations
      
Schedule of Available-for-sale Securities      
Debt Securities, Amortized Cost 266,173,000 254,978,000  
Gross Unrealized Gains 1,878,000 1,075,000  
Gross Unrealized Losses (1,226,000) (2,344,000)  
Debt Securities, Estimated Fair Value 266,825,000 253,709,000  
Private label residential mortgage backed securities
      
Schedule of Available-for-sale Securities      
Debt Securities, Amortized Cost 3,957,000 4,344,000  
Equity Securities, Amortized Cost 21    
Gross Unrealized Gains 1,254,000 1,047,000  
Gross Unrealized Losses 0 0  
Debt Securities, Estimated Fair Value 5,211,000 5,391,000  
Other equity securities
      
Schedule of Available-for-sale Securities      
Equity Securities, Amortized Cost 7,596,000 7,596,000  
Gross Unrealized Gains 1,000 2,000  
Gross Unrealized Losses (49,000) (84,000)  
Equity Securities, Estimated Fair Value $ 7,548,000 $ 7,514,000