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Securities (Summary of Investments) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available for Sale and Held to Maturty Securities [Line Items]    
Available for sale securities amortized cost basis $ 355,043 $ 387,910
Available for sale securities unrealized gains 11,398 11,520
Available for sale securities unrealized losses (5,441) (6,527)
Total securities available for sale fair value 361,000 392,903
Held to maturity securities 28,889 29,905
Held to maturity securities unrealized gains 291 14
Held to maturity securities unrealized losses 0 (54)
Held to maturity securities fair value 29,180 29,865
Total available for sale and held to maturity securities amortized cost 383,932 417,815
Total available for sale and held to maturity securities unrealized gains 11,689 11,534
Total available for sale and held to maturity securities unrealized losses (5,441) (6,581)
Total available for sale and held to maturity securities fair value 390,180 422,768
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 39,487 54,474
Available for sale securities unrealized gains 391 720
Available for sale securities unrealized losses 0 (79)
Total securities available for sale fair value 39,878 55,115
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 218,882 230,387
Available for sale securities unrealized gains 8,753 8,369
Available for sale securities unrealized losses (89) (401)
Total securities available for sale fair value 227,546 238,355
Held to maturity securities 28,889 29,905
Held to maturity securities unrealized gains 291 14
Held to maturity securities unrealized losses 0 (54)
Held to maturity securities fair value 29,180 29,865
States and political subdivisions [Member]
   
Schedule of Available for Sale and Held to Maturty Securities [Line Items]    
Available for sale debt securities amortized cost 59,826 60,659
Available for sale securities unrealized gains 2,110 2,200
Available for sale securities unrealized losses 0 0
Total securities available for sale fair value 61,936 62,859
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 30,724 30,715
Available for sale securities unrealized gains 0 0
Available for sale securities unrealized losses (5,344) (6,031)
Total securities available for sale fair value 25,380 24,684
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   547
Available for sale securities unrealized gains   0
Available for sale securities unrealized losses   0
Total securities available for sale fair value   547
Corporate bonds [Member]
   
Schedule of Available for Sale and Held to Maturty Securities [Line Items]    
Available for sale debt securities amortized cost 6,124 11,128
Available for sale securities unrealized gains 144 231
Available for sale securities unrealized losses (8) (16)
Total securities available for sale fair value $ 6,260 $ 11,343