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Borrowings (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Borrowings    
Average Balance Outstanding $ 36,539 $ 30,925
Maximum Outstanding at any Month End 57,702 59,401
Balance $ 31,015 $ 56,834
Federal funds purchased    
Borrowings    
Year End Weighted Rate (as a percent) 0.95% 0.70%
Average Weighted Rate (as a percent) 0.65% 0.41%
Average Balance Outstanding $ 346 $ 659
Maximum Outstanding at any Month End 992 937
Balance $ 992 $ 0
Short-term repurchase agreements    
Borrowings    
Year End Weighted Rate (as a percent) 0.20% 0.10%
Average Weighted Rate (as a percent) 0.17% 0.17%
Average Balance Outstanding $ 36,193 $ 30,266
Maximum Outstanding at any Month End 56,710 58,464
Balance $ 30,023 $ 56,834