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Fair Value of Financial Instruments, Part 1 (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Securities available for sale [Abstract]      
Total securities available for sale $ 605,457 $ 620,360  
Fair value assets transfers from Level 1 to Level 2 0   $ 0
Fair value assets transfers from Level 2 to Level 1 0   $ 0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Securities available for sale [Abstract]      
Total securities available for sale 35 35  
Significant Other Observable Inputs (Level 2) [Member]      
Securities available for sale [Abstract]      
Total securities available for sale 605,422 620,325  
Significant Unobservable Inputs (Level 3) [Member]      
Securities available for sale [Abstract]      
Total securities available for sale 0 0  
Carrying Value [Member]      
Securities available for sale [Abstract]      
Total securities available for sale 605,457 620,360  
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Securities available for sale [Abstract]      
U.S. government sponsored enterprises 0 0  
State and political subdivisions 0 0  
Corporate bonds 0 0  
Mortgage backed securities and collateralized mortgage obligations - residential 0 0  
Small Business Administration - guaranteed participation securities 0 0  
Mortgage backed securities and collateralized mortgage obligations - commercial 0 0  
Other securities 35 35  
Total securities available for sale 35 35  
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Securities available for sale [Abstract]      
U.S. government sponsored enterprises 128,386 117,266  
State and political subdivisions 536 886  
Corporate bonds 40,498 40,705  
Mortgage backed securities and collateralized mortgage obligations - residential 352,591 372,308  
Small Business Administration - guaranteed participation securities 72,858 78,499  
Mortgage backed securities and collateralized mortgage obligations - commercial 9,903 10,011  
Other securities 650 650  
Total securities available for sale 605,422 620,325  
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Securities available for sale [Abstract]      
U.S. government sponsored enterprises 0 0  
State and political subdivisions 0 0  
Corporate bonds 0 0  
Mortgage backed securities and collateralized mortgage obligations - residential 0 0  
Small Business Administration - guaranteed participation securities 0 0  
Mortgage backed securities and collateralized mortgage obligations - commercial 0 0  
Other securities 0 0  
Total securities available for sale 0 0  
Recurring [Member] | Carrying Value [Member]      
Securities available for sale [Abstract]      
U.S. government sponsored enterprises 128,386 117,266  
State and political subdivisions 536 886  
Corporate bonds 40,498 40,705  
Mortgage backed securities and collateralized mortgage obligations - residential 352,591 372,308  
Small Business Administration - guaranteed participation securities 72,858 78,499  
Mortgage backed securities and collateralized mortgage obligations - commercial 9,903 10,011  
Other securities 685 685  
Total securities available for sale $ 605,457 $ 620,360