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Certificates of Deposit (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Maturities Of Certificates Of Deposit [Line Items]      
Certificates of deposit less than $100,000 $ 284,066 $ 195,115  
Certificates $100,000 to $250,000 232,759 240,904  
Certificates $250,000 and over 42,176 40,601  
Total 559,001 476,620  
Maturity of certificates of deposit [Abstract]      
2018 393,316    
2019 53,565    
2020 51,226    
2021 30,197    
2022 30,667    
2023 and thereafter 30    
Total 559,001 476,620  
Interest expense on certificates of deposit of $100,000 or greater 2,105 $ 1,970 $ 2,431
Less than $100,000      
Maturities Of Certificates Of Deposit [Line Items]      
Total 284,066    
Maturity of certificates of deposit [Abstract]      
2018 215,571    
2019 26,401    
2020 17,516    
2021 13,137    
2022 11,411    
2023 and thereafter 30    
Total 284,066    
$100,000 and Greater      
Maturities Of Certificates Of Deposit [Line Items]      
Total 274,935    
Maturity of certificates of deposit [Abstract]      
2018 177,745    
2019 27,164    
2020 33,710    
2021 17,060    
2022 19,256    
2023 and thereafter 0    
Total $ 274,935