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Securities (Summary of Investments) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Schedule of Available for Sale and Held to Maturty Securities [Line Items]    
Available for sale securities unrealized gains $ 13,912 $ 21,209
Available for sale securities unrealized losses (6,821) (9,119)
Available for sale debt securities fair value 388,085  
Available-for-sale Securities, Amortized Cost Basis 380,994 363,408
Total securities available for sale fair value 388,085 375,498
Held to maturity securities 31,264 40,381
Held to maturity securities unrealized gains 698 1,039
Held to maturity securities unrealized losses 0 0
Held to maturity securities fair value 31,962 41,420
Total available for sale and held to maturity securities amortized cost 412,258 403,789
Total available for sale and held to maturity securities unrealized gains 14,610 22,248
Total available for sale and held to maturity securities unrealized losses (6,821) (9,119)
Total available for sale and held to maturity securities fair value 420,047 416,918
Obligations of U.S. government-sponsored enterprises [Member]
   
Schedule of Available for Sale and Held to Maturty Securities [Line Items]    
Available for sale debt securities amortized cost 54,461 29,458
Available for sale securities unrealized gains 1,208 2,212
Available for sale securities unrealized losses 0 0
Available for sale debt securities fair value 55,669 31,670
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
   
Schedule of Available for Sale and Held to Maturty Securities [Line Items]    
Available for sale debt securities amortized cost 218,598 217,136
Available for sale securities unrealized gains 9,943 14,097
Available for sale securities unrealized losses (36) 0
Available for sale debt securities fair value 228,505 231,233
Held to maturity securities 31,264 40,381
Held to maturity securities unrealized gains 698 1,039
Held to maturity securities unrealized losses 0 0
Held to maturity securities fair value 31,962 41,420
States and political subdivisions [Member]
   
Schedule of Available for Sale and Held to Maturty Securities [Line Items]    
Available for sale debt securities amortized cost 64,833 68,196
Available for sale securities unrealized gains 2,507 4,424
Available for sale securities unrealized losses 0 0
Available for sale debt securities fair value 67,340 72,620
Trust preferred securities: Individual name issuers [Member]
   
Schedule of Available for Sale and Held to Maturty Securities [Line Items]    
Available for sale debt securities amortized cost 30,705 30,677
Available for sale securities unrealized gains 0 0
Available for sale securities unrealized losses (5,930) (5,926)
Available for sale debt securities fair value 24,775 24,751
Trust preferred securities: Collateralized debt obligations [Member]
   
Schedule of Available for Sale and Held to Maturty Securities [Line Items]    
Available for sale debt securities amortized cost 1,264 4,036
Available for sale securities unrealized gains 0 0
Available for sale securities unrealized losses (839) (3,193)
Available for sale debt securities fair value 425 843
Corporate bonds [Member]
   
Schedule of Available for Sale and Held to Maturty Securities [Line Items]    
Available for sale debt securities amortized cost 11,133 13,905
Available for sale securities unrealized gains 254 476
Available for sale securities unrealized losses (16) 0
Available for sale debt securities fair value $ 11,371 $ 14,381