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Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Fair value measurement    
Securities available-for-sale $ 791,537 $ 784,916
US Government Agencies Debt Securities [Member]    
Fair value measurement    
Securities available-for-sale 33,524 25,364
Mortgage Backed Securities - Residential    
Fair value measurement    
Securities available-for-sale 188,769 178,743
Mortgage Backed Securities - Commercial    
Fair value measurement    
Securities available-for-sale   0
Collateralized Mortgage Obligations    
Fair value measurement    
Securities available-for-sale 321,317 343,616
State and Municipal Obligations    
Fair value measurement    
Securities available-for-sale 244,594 233,935
Collateralized Debt Obligations    
Fair value measurement    
Securities available-for-sale 3,333 3,258
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
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 785,314 778,523
Derivative Assets 690 218
Derivative Liability (690) (218)
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]    
Fair value measurement    
Securities available-for-sale 33,524 25,364
Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities - Residential    
Fair value measurement    
Securities available-for-sale 188,769 178,743
Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities - Commercial    
Fair value measurement    
Securities available-for-sale   0
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations    
Fair value measurement    
Securities available-for-sale 321,317 343,616
Fair Value, Inputs, Level 2 [Member] | State and Municipal Obligations    
Fair value measurement    
Securities available-for-sale 241,704 230,800
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 6,223 6,393
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
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 2,890 3,135
Fair Value, Inputs, Level 3 [Member] | Collateralized Debt Obligations    
Fair value measurement    
Securities available-for-sale $ 3,333 $ 3,258