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Fair Value Measurements - Financial assets and liabilities measured at fair value on a recurring basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Level I [Member]    
Assets:    
U.S. Treasury securities $ 65,721 $ 39,228
Mortgage-backed securities:    
Interest rate cap 0 0
Liabilities:    
Interest rate swaps 0 0
Level I [Member] | Interest rate cap [Member]    
Mortgage-backed securities:    
Interest rate cap 0  
Level II [Member]    
Assets:    
U.S. Treasury securities 0 0
Mortgage-backed securities:    
Interest rate cap 242 73
Liabilities:    
Interest rate swaps 766 370
Level II [Member] | Interest rate cap [Member]    
Mortgage-backed securities:    
Interest rate cap 12 39
Level III [Member]    
Assets:    
U.S. Treasury securities 0 0
Mortgage-backed securities:    
Interest rate cap 0 0
Liabilities:    
Interest rate swaps 0 0
Level III [Member] | Interest rate cap [Member]    
Mortgage-backed securities:    
Interest rate cap 0  
Recurring [Member]    
Assets:    
U.S. government agencies 80,786 78,940
Obligations of states and political subdivisions 70,586 75,593
Mortgage-backed securities:    
Agency 138,558 131,661
Non-agency 12,097 12,777
Other asset backed securities 59,096 58,781
Corporate securities 15,902 16,819
Liabilities:    
Interest rate swaps 766 370
Recurring [Member] | Interest Rate Swap [Member]    
Mortgage-backed securities:    
Interest rate swaps 242 73
Recurring [Member] | Interest rate cap [Member]    
Mortgage-backed securities:    
Interest rate cap 12 39
Recurring [Member] | 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
Recurring [Member] | Level I [Member] | Interest Rate Swap [Member]    
Mortgage-backed securities:    
Interest rate swaps 0 0
Recurring [Member] | Level I [Member] | Interest rate cap [Member]    
Mortgage-backed securities:    
Interest rate cap 0  
Recurring [Member] | Level II [Member]    
Assets:    
U.S. government agencies 80,786 78,940
Obligations of states and political subdivisions 70,586 75,593
Mortgage-backed securities:    
Agency 138,558 131,661
Non-agency 12,097 12,777
Other asset backed securities 59,096 58,781
Corporate securities 15,902 16,819
Liabilities:    
Interest rate swaps 766 370
Recurring [Member] | Level II [Member] | Interest Rate Swap [Member]    
Mortgage-backed securities:    
Interest rate swaps 242 73
Recurring [Member] | Level II [Member] | Interest rate cap [Member]    
Mortgage-backed securities:    
Interest rate cap 12 39
Recurring [Member] | 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
Liabilities:    
Interest rate swaps 0 $ 0
Recurring [Member] | Level III [Member] | Interest Rate Swap [Member]    
Mortgage-backed securities:    
Interest rate swaps 0 $ 0
Recurring [Member] | Level III [Member] | Interest rate cap [Member]    
Mortgage-backed securities:    
Interest rate cap $ 0