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Securities (Schedule of Information Regarding Securities with Unrealized Losses) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Securities in an Unrealized Loss Position for Less than 12 Months    
Total temporarily impaired securities Fair Value $ 196,029 $ 232,817
Total temporarily impaired securities Unrealized Losses 2,639 4,138
Securities in an Unrealized Loss Position for More than 12 Months    
Total temporarily impaired securities Fair Value 18,802 19,943
Total temporarily impaired securities Unrealized Losses 578 622
Total temporarily impaired securities Fair Value 214,831 252,760
Total temporarily impaired securities Unrealized Losses 3,217 4,760
Government-sponsored enterprise securities [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 13,917 7,990
AFS Unrealized Losses 80 7
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value
AFS Unrealized Losses
Total AFS Fair Value 13,917 7,990
Total AFS Unrealized Losses 80 7
Mortgage-backed securities [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 167,034 196,999
AFS Unrealized Losses 2,513 3,841
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 17,862 19,001
AFS Unrealized Losses 518 552
Total AFS Fair Value 184,896 216,000
Total AFS Unrealized Losses 3,031 4,393
Corporate bonds [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 8,021 27,027
AFS Unrealized Losses 17 259
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 940 935
AFS Unrealized Losses 60 65
Total AFS Fair Value 8,961 27,962
Total AFS Unrealized Losses 77 324
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 AFS Fair Value 7
Total AFS Unrealized Losses 5
State and local governments [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 7,057 801
AFS Unrealized Losses 29 31
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value
AFS Unrealized Losses
Total AFS Fair Value 7,057 801
Total AFS Unrealized Losses $ 29 $ 31