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Fair Value of Assets and Liabilities - Recurring (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments $ 458,817 $ 450,935
Derivative assets 1,364 0
Derivative Liability   0
Obligations of U.S. government agencies    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments 60,643 47,318
Mortgage-backed securities - U.S. government sponsored entities and agencies    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments 239,335 245,235
Mortgage-backed securities - Non-agency    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments 24,237 34,317
State and municipal securities    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments 125,831 108,406
Asset backed securities    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments 8,771 15,627
Other investments    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments   32
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments   32
Significant Other Observable Inputs (Level 2)    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments 458,817 450,903
Significant Other Observable Inputs (Level 2) | Interest rate swaps    
Financial instruments the Company measures at fair value on a recurring basis    
Derivative assets 1,364  
Derivative Liability 1,364  
Assets At Fair Value    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments 458,817 450,935
Assets At Fair Value | Interest rate swaps    
Financial instruments the Company measures at fair value on a recurring basis    
Derivative assets 1,364  
Derivative Liability 1,364  
Recurring basis    
Transfers between level 1 and level 2    
Assets transfer from Level 1 to level 2 0 0
Assets transfer from Level 2 to level 1 0 0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial instruments the Company measures at fair value on a recurring basis    
Total assets measured on a recurring basis   32
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other investments    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments   32
Recurring basis | Significant Other Observable Inputs (Level 2)    
Financial instruments the Company measures at fair value on a recurring basis    
Total assets measured on a recurring basis 460,181 450,903
Total liabilities measured on a recurring bases 1,364  
Recurring basis | Significant Other Observable Inputs (Level 2) | Obligations of U.S. government agencies    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments 60,643 47,318
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities - U.S. government sponsored entities and agencies    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments 239,335 245,235
Recurring basis | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities - Non-agency    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments 24,237 34,317
Recurring basis | Significant Other Observable Inputs (Level 2) | State and municipal securities    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments 125,831 108,406
Recurring basis | Significant Other Observable Inputs (Level 2) | Asset backed securities    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments 8,771 15,627
Recurring basis | Significant Other Observable Inputs (Level 2) | Interest rate swaps    
Financial instruments the Company measures at fair value on a recurring basis    
Derivative assets 1,364  
Derivative Liability 1,364  
Recurring basis | Assets At Fair Value    
Financial instruments the Company measures at fair value on a recurring basis    
Total assets measured on a recurring basis 460,181 450,935
Total liabilities measured on a recurring bases 1,364  
Recurring basis | Assets At Fair Value | Obligations of U.S. government agencies    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments 60,643 47,318
Recurring basis | Assets At Fair Value | Mortgage-backed securities - U.S. government sponsored entities and agencies    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments 239,335 245,235
Recurring basis | Assets At Fair Value | Mortgage-backed securities - Non-agency    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments 24,237 34,317
Recurring basis | Assets At Fair Value | State and municipal securities    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments 125,831 108,406
Recurring basis | Assets At Fair Value | Asset backed securities    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments 8,771 15,627
Recurring basis | Assets At Fair Value | Other investments    
Financial instruments the Company measures at fair value on a recurring basis    
Available-for-sale investments   $ 32
Recurring basis | Assets At Fair Value | Interest rate swaps    
Financial instruments the Company measures at fair value on a recurring basis    
Derivative assets 1,364  
Derivative Liability $ 1,364