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Securities (Summary of Investments) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule of Available for Sale and Held to Maturity Securities [Line Items]    
Available for sale securities unrealized gains $ 19,223 $ 21,209
Available for sale securities unrealized losses (5,972) (9,119)
Available for sale debt securities fair value 350,205  
Total securities available for sale amortized cost 336,954 363,408
Total securities available for sale fair value 350,205 375,498
Held to maturity securities 36,897 40,381
Held to maturity securities unrealized gains 907 1,039
Held to maturity securities unrealized losses 0 0
Held to maturity securities fair value 37,804 41,420
Total available for sale and held to maturity securities amortized cost 373,851 403,789
Total available for sale and held to maturity securities unrealized gains 20,130 22,248
Total available for sale and held to maturity securities unrealized losses (5,972) (9,119)
Total available for sale and held to maturity securities fair value 388,009 416,918
Obligations of U.S. government-sponsored enterprises [Member]
   
Schedule of Available for Sale and Held to Maturity Securities [Line Items]    
Available for sale debt securities amortized cost 29,465 29,458
Available for sale securities unrealized gains 1,855 2,212
Available for sale securities unrealized losses 0 0
Available for sale debt securities fair value 31,320 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 debt securities amortized cost 193,921 217,136
Available for sale securities unrealized gains 12,873 14,097
Available for sale securities unrealized losses 0 0
Available for sale debt securities fair value 206,794 231,233
Held to maturity securities 36,897 40,381
Held to maturity securities unrealized gains 907 1,039
Held to maturity securities unrealized losses 0 0
Held to maturity securities fair value 37,804 41,420
States and political subdivisions [Member]
   
Schedule of Available for Sale and Held to Maturity Securities [Line Items]    
Available for sale debt securities amortized cost 67,502 68,196
Available for sale securities unrealized gains 4,081 4,424
Available for sale securities unrealized losses 0 0
Available for sale debt securities fair value 71,583 72,620
Trust preferred securities: Individual name issuers [Member]
   
Schedule of Available for Sale and Held to Maturity Securities [Line Items]    
Available for sale debt securities amortized cost 30,686 30,677
Available for sale securities unrealized gains 0 0
Available for sale securities unrealized losses (5,112) (5,926)
Available for sale debt securities fair value 25,574 24,751
Trust preferred securities: Collateralized debt obligations [Member]
   
Schedule of Available for Sale and Held to Maturity Securities [Line Items]    
Available for sale debt securities amortized cost 1,264 [1] 4,036 [1]
Available for sale securities unrealized gains 0 0
Available for sale securities unrealized losses (860) (3,193)
Available for sale debt securities fair value 404 843
Corporate bonds [Member]
   
Schedule of Available for Sale and Held to Maturity Securities [Line Items]    
Available for sale debt securities amortized cost 14,116 13,905
Available for sale securities unrealized gains 414 476
Available for sale securities unrealized losses 0 0
Available for sale debt securities fair value $ 14,530 $ 14,381
[1] Net of other-than-temporary impairment losses recognized in earnings.