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Securities (Schedule of Information Regarding Securities with Unrealized Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Securities in an Unrealized Loss Position for Less than 12 Months    
Total temporarily impaired securities Fair Value $ 232,817 $ 181,692
Total temporarily impaired securities Unrealized Losses 4,138 1,371
Securities in an Unrealized Loss Position for More than 12 Months    
Total temporarily impaired securities Fair Value 19,943 31,395
Total temporarily impaired securities Unrealized Losses 622 954
Total temporarily impaired securities Fair Value 252,760 213,087
Total temporarily impaired securities Unrealized Losses 4,760 2,325
Government-sponsored enterprise securities [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 7,990 5,993
AFS Unrealized Losses 7 7
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 2,978
AFS Unrealized Losses 22
Total temporarily impaired securities Fair Value 7,990 8,971
Total temporarily impaired securities Unrealized Losses 7 29
Mortgage-backed securities [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 196,999 150,853
AFS Unrealized Losses 3,841 1,148
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 19,001 27,460
AFS Unrealized Losses 552 863
Total temporarily impaired securities Fair Value 216,000 178,313
Total temporarily impaired securities Unrealized Losses 4,393 2,011
Corporate bonds [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 27,027 24,006
AFS Unrealized Losses 259 210
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 935 940
AFS Unrealized Losses 65 60
Total temporarily impaired securities Fair Value 27,962 24,946
Total temporarily impaired securities Unrealized Losses 324 270
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 17
AFS Unrealized Losses 5 9
Total temporarily impaired securities Fair Value 7 17
Total temporarily impaired securities Unrealized Losses 5 9
State and local governments [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
HTM Fair Value 801 840
HTM Unrealized Losses 31 6
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value
AFS Unrealized Losses
HTM Fair Value  
Total temporarily impaired securities Fair Value 801 840
Total temporarily impaired securities Unrealized Losses $ 31 $ 6