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Short-Term Borrowings (Tables)
12 Months Ended
Dec. 31, 2015
Short-Term Borrowings [Abstract]  
Summary Of Short-Term Borrowings
    2015     2014  
      Weighted       Weighted  
    Total Average     Total Average  
    Principal Rate     Principal Rate  
 
Federal Home Loan Bank Advances $ 313,000 0.54 % $ 293,800 0.45 %
Securities sold under agreements to repurchase   20,909 0.28 %   19,720 0.27 %
Total short-term borrowings $ 333,909     $ 313,520    
Short-Term Federal Home Loan Bank Borrowings
    2015   2014
 
Average daily balance during the year $ 295,479 $ 287,778
Maximum month-end balance during the year $ 342,000 $ 363,900
Amount outstanding at end of year $ 313,000 $ 293,800
Securities Sold Under Agreements To Repurchase
    2015     2014  
 
Average daily balance during the year $ 17,001   $ 16,851  
Average interest rate during the year   0.28 %   0.27 %
Maximum month-end balance during the year $ 21,239   $ 21,021  
Amount outstanding at end of year $ 20,909   $ 19,720  
Securities Collateralizing Repurchase Agreements
            2015     2014    
 
Carrying value         $ 28,324   $ 38,552  
Estimated fair value         $ 28,981   $ 39,669