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Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Fair value measurement    
Securities available-for-sale $ 835,424 $ 853,725
US Government Agencies Debt Securities [Member]    
Fair value measurement    
Securities available-for-sale 14,534 13,249
Mortgage Backed Securities - Residential    
Fair value measurement    
Securities available-for-sale 228,340 261,005
Mortgage Backed Securities - Commercial    
Fair value measurement    
Securities available-for-sale 1 4
Collateralized Mortgage Obligations    
Fair value measurement    
Securities available-for-sale 347,605 348,176
State and Municipal Obligations    
Fair value measurement    
Securities available-for-sale 231,252 218,923
Collateralized Debt Obligations    
Fair value measurement    
Securities available-for-sale 13,692 12,368
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 818,052 837,147
Derivative Assets 484 653
Derivative Liability (484) (653)
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]    
Fair value measurement    
Securities available-for-sale 14,534 13,249
Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities - Residential    
Fair value measurement    
Securities available-for-sale 228,340 261,005
Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities - Commercial    
Fair value measurement    
Securities available-for-sale 1 4
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations    
Fair value measurement    
Securities available-for-sale 347,605 348,176
Fair Value, Inputs, Level 2 [Member] | State and Municipal Obligations    
Fair value measurement    
Securities available-for-sale 227,572 214,713
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 17,372 16,578
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 3,680 4,210
Fair Value, Inputs, Level 3 [Member] | Collateralized Debt Obligations    
Fair value measurement    
Securities available-for-sale $ 13,692 $ 12,368