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Fair Value of Financial Instruments, Part 1 (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Securities available for sale [Abstract]    
Total securities available for sale $ 571,965 $ 620,360
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 571,930 620,325
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 571,965 620,360
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
Mortgage backed securities and collateralized mortgage obligations - residential 0 0
Corporate bonds 0  
Small Business Administration- guaranteed participation securities 0 0
Mortgage backed securities and collateralized mortgage obligations - commercial 0 0
Other 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 137,851 117,266
State and political subdivisions 525 886
Mortgage backed securities and collateralized mortgage obligations - residential 315,983 372,308
Corporate bonds 40,162 40,705
Small Business Administration- guaranteed participation securities 67,059 78,499
Mortgage backed securities and collateralized mortgage obligations - commercial 9,700 10,011
Other 650 650
Total securities available for sale 571,930 620,325
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
Mortgage backed securities and collateralized mortgage obligations - residential 0 0
Corporate bonds 0  
Small Business Administration- guaranteed participation securities 0 0
Mortgage backed securities and collateralized mortgage obligations - commercial 0 0
Other 0 0
Total securities available for sale 0 0
Recurring [Member] | Carrying Value [Member]    
Securities available for sale [Abstract]    
U.S. government sponsored enterprises 137,851 117,266
State and political subdivisions 525 886
Mortgage backed securities and collateralized mortgage obligations - residential 315,983 372,308
Corporate bonds 40,162 40,705
Small Business Administration- guaranteed participation securities 67,059 78,499
Mortgage backed securities and collateralized mortgage obligations - commercial 9,700 10,011
Other 685 685
Total securities available for sale $ 571,965 $ 620,360