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Securities (Schedule of Information Regarding Securities with Unrealized Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Securities in an Unrealized Loss Position for Less than 12 Months    
Total temporarily impaired securities Fair Value $ 214,027 $ 232,817
Total temporarily impaired securities Unrealized Losses 1,782 4,138
Securities in an Unrealized Loss Position for More than 12 Months    
Total temporarily impaired securities Fair Value 128,965 19,943
Total temporarily impaired securities Unrealized Losses 1,972 622
Total temporarily impaired securities Fair Value 342,992 252,760
Total temporarily impaired securities Unrealized Losses 3,754 4,760
Government-sponsored enterprise securities [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 10,897 7,990
AFS Unrealized Losses 103 7
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 2,970
AFS Unrealized Losses 30
Total temporarily impaired securities Fair Value 13,867 7,990
Total temporarily impaired securities Unrealized Losses 133 7
Mortgage-backed securities [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 192,702 196,999
AFS Unrealized Losses 1,582 3,841
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 125,060 19,001
AFS Unrealized Losses 1,877 552
Total temporarily impaired securities Fair Value 317,762 216,000
Total temporarily impaired securities Unrealized Losses 3,459 4,393
Corporate bonds [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 2,500 27,027
AFS Unrealized Losses 49 259
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 935 935
AFS Unrealized Losses 65 65
Total temporarily impaired securities Fair Value 3,435 27,962
Total temporarily impaired securities Unrealized Losses 114 324
Equity securities [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value  
AFS Unrealized Losses  
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value   7
AFS Unrealized Losses   5
Total temporarily impaired securities Fair Value   7
Total temporarily impaired securities Unrealized Losses   5
State and local governments [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
HTM Fair Value 7,928 801
HTM Unrealized Losses 48 31
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value
AFS Unrealized Losses
Total temporarily impaired securities Fair Value 7,928 801
Total temporarily impaired securities Unrealized Losses $ 48 $ 31