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Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair value measurement    
Securities available-for-sale $ 885,836 $ 897,053
US Government Agencies Debt Securities [Member]    
Fair value measurement    
Securities available-for-sale 11,120 1,467
Mortgage Backed Securities - Residential    
Fair value measurement    
Securities available-for-sale 194,340 187,936
Mortgage Backed Securities - Commercial    
Fair value measurement    
Securities available-for-sale 10 17
Collateralized Mortgage Obligations    
Fair value measurement    
Securities available-for-sale 453,909 484,655
State and Municipal Obligations    
Fair value measurement    
Securities available-for-sale 211,340 207,675
Collateralized Debt Obligations    
Fair value measurement    
Securities available-for-sale 15,117 15,303
Fair Value, Inputs, Level 1 [Member]    
Fair value measurement    
Securities available-for-sale 0 0
Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities [Member]    
Fair value measurement    
Securities available-for-sale 0 0
Fair Value, Inputs, Level 1 [Member] | Mortgage Backed Securities - Residential    
Fair value measurement    
Securities available-for-sale 0 0
Fair Value, Inputs, Level 1 [Member] | Mortgage Backed Securities - Commercial    
Fair value measurement    
Securities available-for-sale 0 0
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Obligations    
Fair value measurement    
Securities available-for-sale 0 0
Fair Value, Inputs, Level 1 [Member] | State and Municipal Obligations    
Fair value measurement    
Securities available-for-sale 0 0
Fair Value, Inputs, Level 1 [Member] | Collateralized Debt Obligations    
Fair value measurement    
Securities available-for-sale 0 0
Fair Value, Inputs, Level 2 [Member]    
Fair value measurement    
Securities available-for-sale 865,994 875,850
Derivative Assets 1,568 1,062
Derivative Liability (1,568) (1,062)
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]    
Fair value measurement    
Securities available-for-sale 11,120 1,467
Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities - Residential    
Fair value measurement    
Securities available-for-sale 194,340 187,936
Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities - Commercial    
Fair value measurement    
Securities available-for-sale 10 17
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations    
Fair value measurement    
Securities available-for-sale 453,909 484,655
Fair Value, Inputs, Level 2 [Member] | State and Municipal Obligations    
Fair value measurement    
Securities available-for-sale 206,615 201,775
Fair Value, Inputs, Level 2 [Member] | Collateralized Debt Obligations    
Fair value measurement    
Securities available-for-sale 0 0
Fair Value, Inputs, Level 3 [Member]    
Fair value measurement    
Securities available-for-sale 19,842 21,203
Fair Value, Inputs, Level 3 [Member] | US Government Agencies Debt Securities [Member]    
Fair value measurement    
Securities available-for-sale 0 0
Fair Value, Inputs, Level 3 [Member] | Mortgage Backed Securities - Residential    
Fair value measurement    
Securities available-for-sale 0 0
Fair Value, Inputs, Level 3 [Member] | Mortgage Backed Securities - Commercial    
Fair value measurement    
Securities available-for-sale 0 0
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Obligations    
Fair value measurement    
Securities available-for-sale 0 0
Fair Value, Inputs, Level 3 [Member] | State and Municipal Obligations    
Fair value measurement    
Securities available-for-sale 4,725 5,900
Fair Value, Inputs, Level 3 [Member] | Collateralized Debt Obligations    
Fair value measurement    
Securities available-for-sale $ 15,117 $ 15,303