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Certificates of Deposit (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Maturities Of Certificates Of Deposit [Line Items]      
Certificates of deposit less than $100,000 $ 195,115 $ 158,529  
Certificates $100,000 to $250,000 240,904 175,077  
Certificates $250,000 and over 40,601 37,376  
Total 476,620 370,982  
Maturity of certificates of deposit [Abstract]      
2017 321,537    
2018 30,858    
2019 45,272    
2020 45,912    
2021 32,464    
2022 and thereafter 577    
Total 476,620 370,982  
Interest expense on certificates of deposit of $100,000 or greater 1,970 $ 2,431 $ 2,823
Less than $100,000      
Maturities Of Certificates Of Deposit [Line Items]      
Total 195,115    
Maturity of certificates of deposit [Abstract]      
2017 132,813    
2018 13,346    
2019 20,991    
2020 14,597    
2021 13,313    
2022 and thereafter 55    
Total 195,115    
$100,000 and Greater      
Maturities Of Certificates Of Deposit [Line Items]      
Total 281,505    
Maturity of certificates of deposit [Abstract]      
2017 188,724    
2018 17,512    
2019 24,281    
2020 31,315    
2021 19,151    
2022 and thereafter 522    
Total $ 281,505