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Time Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Time Deposits $250,000 or more [Abstract]    
Balance $ 212,574 $ 289,955
Maturities of Time Deposits [Abstract]    
2018 426,874  
2019 30,219  
2020 10,317  
2021 3,100  
2022 4,887  
Total $ 475,397 $ 570,293