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Fair Value of Financial Instruments, Part 1 (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Securities available for sale [Abstract]      
Total securities available for sale $ 559,083 $ 571,965  
Fair value assets transfers from Level 1 to Level 2 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 559,048 571,930  
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 559,083 571,965  
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 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] | Significant Other Observable Inputs (Level 2) [Member]      
Securities available for sale [Abstract]      
U.S. government sponsored enterprises 151,327 137,851  
State and political subdivisions 525 525  
Mortgage backed securities and collateralized mortgage obligations - residential 297,633 315,983  
Corporate bonds 35,227 40,162  
Small Business Administration - guaranteed participation securities 64,113 67,059  
Mortgage backed securities and collateralized mortgage obligations - commercial 9,573 9,700  
Other securities 685 685  
Total securities available for sale 559,083 571,965  
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 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 151,327 137,851  
State and political subdivisions 525 525  
Mortgage backed securities and collateralized mortgage obligations - residential 297,633 315,983  
Corporate bonds 35,227 40,162  
Small Business Administration - guaranteed participation securities 64,113 67,059  
Mortgage backed securities and collateralized mortgage obligations - commercial 9,573 9,700  
Other securities 685 685  
Total securities available for sale $ 559,083 $ 571,965