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Securities (Details 4) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Held-to-maturity Securities [Abstract]    
Fair Value, Held to Maturity, Less than 12 Months $ 164,815 $ 38,085
Unrealized Losses, Held to Maturity, Less than 12 months (8,401) (266)
Fair Value, Held to Maturity, 12 Months or More 0 126
Unrealized Losses, Held to Maturity, 12 Months or More 0 (1)
Fair Value, Held to Maturity, Total 164,815 38,211
Unrealized Losses, Held to Maturity, Total (8,401) (267)
Available-for-sale Securities [Abstract]    
Fair Value, Available for Sale, Less than 12 Months 94,015 60,047
Unrealized Losses, Available for Sale, Less than 12 months (3,214) (480)
Fair Value, Available for Sale, 12 Months or More 142,322 18,861
Unrealized Losses, Available for Sale, 12 months or More (16,245) (13,555)
Fair Value, Available for Sale, Total 236,337 78,908
Unrealized Losses, Available for Sale, Total (19,459) (14,035)
Trust preferred securities [Member]
   
Available-for-sale Securities [Abstract]    
Fair Value, Available for Sale, Less than 12 Months 0 0
Unrealized Losses, Available for Sale, Less than 12 months 0 0
Fair Value, Available for Sale, 12 Months or More 15,960 15,068
Unrealized Losses, Available for Sale, 12 months or More (11,751) (13,544)
Fair Value, Available for Sale, Total 15,960 15,068
Unrealized Losses, Available for Sale, Total (11,751) (13,544)
Other debt securities [Member]
   
Available-for-sale Securities [Abstract]    
Fair Value, Available for Sale, Less than 12 Months 2,883 0
Unrealized Losses, Available for Sale, Less than 12 months (91) 0
Fair Value, Available for Sale, 12 Months or More 2,140 2,188
Unrealized Losses, Available for Sale, 12 months or More (2) (1)
Fair Value, Available for Sale, Total 5,023 2,188
Unrealized Losses, Available for Sale, Total (93) (1)
Other equity securities [Member]
   
Available-for-sale Securities [Abstract]    
Fair Value, Available for Sale, Less than 12 Months   0
Unrealized Losses, Available for Sale, Less than 12 months   0
Fair Value, Available for Sale, 12 Months or More   0
Unrealized Losses, Available for Sale, 12 months or More   0
Fair Value, Available for Sale, Total   0
Unrealized Losses, Available for Sale, Total   0
Obligations of other U.S. Government agencies and corporations [Member]
   
Held-to-maturity Securities [Abstract]    
Fair Value, Held to Maturity, Less than 12 Months 119,503 35,224
Unrealized Losses, Held to Maturity, Less than 12 months (6,049) (232)
Fair Value, Held to Maturity, 12 Months or More 0 0
Unrealized Losses, Held to Maturity, 12 Months or More 0 0
Fair Value, Held to Maturity, Total 119,503 35,224
Unrealized Losses, Held to Maturity, Total (6,049) (232)
Available-for-sale Securities [Abstract]    
Fair Value, Available for Sale, Less than 12 Months 3,807 0
Unrealized Losses, Available for Sale, Less than 12 months (193) 0
Fair Value, Available for Sale, 12 Months or More 0 0
Unrealized Losses, Available for Sale, 12 months or More 0 0
Fair Value, Available for Sale, Total 3,807 0
Unrealized Losses, Available for Sale, Total (193) 0
Obligations of states and political subdivisions [Member]
   
Held-to-maturity Securities [Abstract]    
Fair Value, Held to Maturity, Less than 12 Months 45,312 2,861
Unrealized Losses, Held to Maturity, Less than 12 months (2,352) (34)
Fair Value, Held to Maturity, 12 Months or More 0 126
Unrealized Losses, Held to Maturity, 12 Months or More 0 (1)
Fair Value, Held to Maturity, Total 45,312 2,987
Unrealized Losses, Held to Maturity, Total (2,352) (35)
Government agency mortgage backed securities [Member] | Residential mortgage backed securities [Member]
   
Available-for-sale Securities [Abstract]    
Fair Value, Available for Sale, Less than 12 Months 0 15,431
Unrealized Losses, Available for Sale, Less than 12 months 0 (91)
Fair Value, Available for Sale, 12 Months or More 103,728 0
Unrealized Losses, Available for Sale, 12 months or More (4,000) 0
Fair Value, Available for Sale, Total 103,728 15,431
Unrealized Losses, Available for Sale, Total (4,000) (91)
Government agency mortgage backed securities [Member] | Commercial mortgage backed securities [Member]
   
Available-for-sale Securities [Abstract]    
Fair Value, Available for Sale, Less than 12 Months 0 0
Unrealized Losses, Available for Sale, Less than 12 months 0 0
Fair Value, Available for Sale, 12 Months or More 16,808 0
Unrealized Losses, Available for Sale, 12 months or More (473) 0
Fair Value, Available for Sale, Total 16,808 0
Unrealized Losses, Available for Sale, Total (473) 0
Government agency collateralized mortgage obligations [Member] | Residential mortgage backed securities [Member]
   
Available-for-sale Securities [Abstract]    
Fair Value, Available for Sale, Less than 12 Months 87,325 44,616
Unrealized Losses, Available for Sale, Less than 12 months (2,930) (389)
Fair Value, Available for Sale, 12 Months or More 3,686 1,605
Unrealized Losses, Available for Sale, 12 months or More (19) (10)
Fair Value, Available for Sale, Total 91,011 46,221
Unrealized Losses, Available for Sale, Total (2,949) (399)
Government agency collateralized mortgage obligations [Member] | Commercial mortgage backed securities [Member]
   
Available-for-sale Securities [Abstract]    
Fair Value, Available for Sale, Less than 12 Months 0 0
Unrealized Losses, Available for Sale, Less than 12 months 0 0
Fair Value, Available for Sale, 12 Months or More 0 0
Unrealized Losses, Available for Sale, 12 months or More 0 0
Fair Value, Available for Sale, Total 0 0
Unrealized Losses, Available for Sale, Total $ 0 $ 0