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Fair Value Measurements - Financial assets and liabilities measured at fair value on a recurring basis (Details) - Recurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Assets:    
U.S. government agencies $ 73,184 $ 78,940
Obligations of states and political subdivisions 63,373 75,593
Mortgage-backed securities:    
Agency 98,051 131,661
Non-agency 9,933 12,777
Other asset backed securities 41,605 58,781
Corporate securities 15,421 16,819
Liabilities:    
Interest rate swaps 242 370
Level I [Member]    
Assets:    
U.S. government agencies 0 0
Obligations of states and political subdivisions 0 0
Mortgage-backed securities:    
Agency 0 0
Non-agency 0 0
Other asset backed securities 0 0
Corporate securities 0 0
Liabilities:    
Interest rate swaps 0 0
Level II [Member]    
Assets:    
U.S. government agencies 73,184 78,940
Obligations of states and political subdivisions 63,373 75,593
Mortgage-backed securities:    
Agency 98,051 131,661
Non-agency 9,933 12,777
Other asset backed securities 41,605 58,781
Corporate securities 15,421 16,819
Liabilities:    
Interest rate swaps 242 370
Level III [Member]    
Assets:    
U.S. government agencies 0 0
Obligations of states and political subdivisions 0 0
Mortgage-backed securities:    
Agency 0 0
Non-agency 0 0
Other asset backed securities 0 0
Corporate securities 0 0
Liabilities:    
Interest rate swaps 0 0
Interest Rate Swap [Member]    
Mortgage-backed securities:    
Interest rate contracts 44 73
Interest Rate Swap [Member] | Level I [Member]    
Mortgage-backed securities:    
Interest rate contracts 0 0
Interest Rate Swap [Member] | Level II [Member]    
Mortgage-backed securities:    
Interest rate contracts 44 73
Interest Rate Swap [Member] | Level III [Member]    
Mortgage-backed securities:    
Interest rate contracts 0 0
Interest Rate Cap [Member]    
Mortgage-backed securities:    
Interest rate contracts 9 39
Interest Rate Cap [Member] | Level I [Member]    
Mortgage-backed securities:    
Interest rate contracts   0
Interest Rate Cap [Member] | Level II [Member]    
Mortgage-backed securities:    
Interest rate contracts $ 9 39
Interest Rate Cap [Member] | Level III [Member]    
Mortgage-backed securities:    
Interest rate contracts   $ 0