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Securities (Summary of Investments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available for Sale and Held to Maturity Securities [Line Items]    
Available for sale securities unrealized gains $ 11,520 $ 21,209
Available for sale securities unrealized losses (6,527) (9,119)
Available for sale securities fair value 392,903 375,498
Available for sale securities amortized cost 387,910 363,408
Held to maturity securities amortized cost 29,905 40,381
Held to maturity securities unrealized gains 14 1,039
Held to Matruity securities unrealized losses (54) 0
Held to maturity securities fair value 29,865 41,420
Total securities amortized cost 417,815 403,789
Total securities unrealized gains 11,534 22,248
Total securities unrealized losses (6,581) (9,119)
Total securities fair value 422,768 416,918
Obligations of U.S. government-sponsored enterprises [Member]
   
Schedule of Available for Sale and Held to Maturity Securities [Line Items]    
Available for sale securities amortized cost 54,474 29,458
Available for sale securities unrealized gains 720 2,212
Available for sale securities unrealized losses (79) 0
Available for sale securities fair value 55,115 31,670
Mortgage-backed securities issued by U.S. government-sponsored agencies and U.S. government-sponsored enterprises [Member]
   
Schedule of Available for Sale and Held to Maturity Securities [Line Items]    
Available for sale securities amortized cost 230,387 217,136
Available for sale securities unrealized gains 8,369 14,097
Available for sale securities unrealized losses (401) 0
Available for sale securities fair value 238,355 231,233
Held to maturity securities amortized cost 29,905 40,381
Held to maturity securities unrealized gains 14 1,039
Held to Matruity securities unrealized losses (54) 0
Held to maturity securities fair value 29,865 41,420
States and political subdivisions [Member]
   
Schedule of Available for Sale and Held to Maturity Securities [Line Items]    
Available for sale securities amortized cost 60,659 68,196
Available for sale securities unrealized gains 2,200 4,424
Available for sale securities unrealized losses 0 0
Available for sale securities fair value 62,859 72,620
Trust preferred securities: Individual name issuers [Member]
   
Schedule of Available for Sale and Held to Maturity Securities [Line Items]    
Available for sale securities amortized cost 30,715 30,677
Available for sale securities unrealized gains 0 0
Available for sale securities unrealized losses (6,031) (5,926)
Available for sale securities fair value 24,684 24,751
Trust preferred securities: Collateralized debt obligations [Member]
   
Schedule of Available for Sale and Held to Maturity Securities [Line Items]    
Available for sale securities amortized cost 547 4,036
Available for sale securities unrealized gains 0 0
Available for sale securities unrealized losses 0 (3,193)
Available for sale securities fair value 547 843
Corporate bonds [Member]
   
Schedule of Available for Sale and Held to Maturity Securities [Line Items]    
Available for sale securities amortized cost 11,128 13,905
Available for sale securities unrealized gains 231 476
Available for sale securities unrealized losses (16) 0
Available for sale securities fair value $ 11,343 $ 14,381