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Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Fair value measurement    
Securities available-for-sale $ 884,176 $ 891,082
US Government Agencies Debt Securities [Member]    
Fair value measurement    
Securities available-for-sale 10,768 10,693
Mortgage Backed Securities - Residential    
Fair value measurement    
Securities available-for-sale 217,914 213,164
Mortgage Backed Securities - Commercial    
Fair value measurement    
Securities available-for-sale 8 9
Collateralized Mortgage Obligations    
Fair value measurement    
Securities available-for-sale 424,207 437,634
State and Municipal Obligations    
Fair value measurement    
Securities available-for-sale 218,127 214,707
Collateralized Debt Obligations    
Fair value measurement    
Securities available-for-sale 13,152 14,875
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 866,814 871,482
Derivative Assets 1,675 1,176
Derivative Liability (1,675) (1,176)
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]    
Fair value measurement    
Securities available-for-sale 10,768 10,693
Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities - Residential    
Fair value measurement    
Securities available-for-sale 217,914 213,164
Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities - Commercial    
Fair value measurement    
Securities available-for-sale 8 9
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations    
Fair value measurement    
Securities available-for-sale 424,207 437,634
Fair Value, Inputs, Level 2 [Member] | State and Municipal Obligations    
Fair value measurement    
Securities available-for-sale 213,917 209,982
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 17,362 19,600
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 4,210 4,725
Fair Value, Inputs, Level 3 [Member] | Collateralized Debt Obligations    
Fair value measurement    
Securities available-for-sale $ 13,152 $ 14,875