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Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Fair value measurement    
Securities available-for-sale $ 876,538 $ 891,082
US Government Agencies Debt Securities [Member]    
Fair value measurement    
Securities available-for-sale 10,407 10,693
Mortgage Backed Securities - Residential    
Fair value measurement    
Securities available-for-sale 225,381 213,164
Mortgage Backed Securities - Commercial    
Fair value measurement    
Securities available-for-sale 6 9
Collateralized Mortgage Obligations    
Fair value measurement    
Securities available-for-sale 408,215 437,634
State and Municipal Obligations    
Fair value measurement    
Securities available-for-sale 221,093 214,707
Collateralized Debt Obligations    
Fair value measurement    
Securities available-for-sale 11,436 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 860,892 871,482
Derivative Assets 1,979 1,176
Derivative Liability (1,979) (1,176)
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]    
Fair value measurement    
Securities available-for-sale 10,407 10,693
Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities - Residential    
Fair value measurement    
Securities available-for-sale 225,381 213,164
Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities - Commercial    
Fair value measurement    
Securities available-for-sale 6 9
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations    
Fair value measurement    
Securities available-for-sale 408,215 437,634
Fair Value, Inputs, Level 2 [Member] | State and Municipal Obligations    
Fair value measurement    
Securities available-for-sale 216,883 209,982
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 15,646 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 $ 11,436 $ 14,875