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Loans and Asset Quality Information (Schedule of Applied Cost Recovery Method of Purchased Impaired Loans) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Purchased impaired loans (substantially all of which are covered loans)    
Balance, beginning, carrying value $ 1,970 $ 2,597
Change due to payments received (1,386) (532)
Transfer to foreclosed real estate   (95)
Change due to loan charge-off (70)  
Other  
Balance, ending, carrying value 514 1,970
Contractual Principal Receivable [Member]    
Purchased impaired loans (substantially all of which are covered loans)    
Balance, beginning, contractual principal 4,791 5,859
Change due to payments received (3,753) (634)
Transfer to foreclosed real estate   (431)
Change due to loan charge-off (428)  
Other   (3)
Balance, ending, contractual principal 610 4,791
Fair Value Adjustment Write Down [Member]    
Purchased impaired loans (substantially all of which are covered loans)    
Balance, beginning, FMV 2,821 3,262
Change due to payments received (2,367) (102)
Transfer to foreclosed real estate   (336)
Change due to loan charge-off (358)  
Other   (3)
Balance, ending, FMV $ 96 $ 2,821