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Certificates of Deposit (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Certificates of deposit by balance [Abstract]      
Certificates of deposit less than $100,000 $ 158,529 $ 184,471  
Certificates $100,000 to $250,000 175,077 221,892  
Certificates $250,000 and over 37,376 41,138  
Total 370,982 447,501  
Maturity of certificates of deposit [Abstract]      
2016 237,494    
2017 27,376    
2018 25,809    
2019 31,695    
2020 47,596    
2021 and thereafter 1,012    
Total 370,982 447,501  
Interest expense on certificates of deposit of $100,000 or greater 2,431 $ 2,823 $ 3,280
Less than $100,000      
Certificates of deposit by balance [Abstract]      
Total 158,529    
Maturity of certificates of deposit [Abstract]      
2016 103,815    
2017 14,785    
2018 9,563    
2019 14,838    
2020 15,438    
2021 and thereafter 90    
Total 158,529    
$100,000 and Greater but Less than $250,000      
Certificates of deposit by balance [Abstract]      
Total 212,453    
Maturity of certificates of deposit [Abstract]      
2016 133,679    
2017 12,591    
2018 16,246    
2019 16,857    
2020 32,158    
2021 and thereafter 922    
Total $ 212,453