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Securities (Schedule of Information Regarding Securities with Unrealized Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Securities in an Unrealized Loss Position for Less than 12 Months    
Total temporarily impaired securities Fair Value $ 181,692 $ 75,474
Total temporarily impaired securities Unrealized Losses 1,371 329
Securities in an Unrealized Loss Position for More than 12 Months    
Total temporarily impaired securities Fair Value 31,395 37,392
Total temporarily impaired securities Unrealized Losses 954 1,299
Total temporarily impaired securities Fair Value 213,087 112,866
Total temporarily impaired securities Unrealized Losses 2,325 1,628
US Government-sponsored enterprises securities [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 5,993 5,489
AFS Unrealized Losses 7 11
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 2,978 2,953
AFS Unrealized Losses 22 47
Total temporarily impaired securities Fair Value 8,971 8,442
Total temporarily impaired securities Unrealized Losses 29 58
Mortgage-backed securities [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 150,853 69,985
AFS Unrealized Losses 1,148 318
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 27,460 33,557
AFS Unrealized Losses 863 1,104
Total temporarily impaired securities Fair Value 178,313 103,542
Total temporarily impaired securities Unrealized Losses 2,011 $ 1,422
Corporate bonds [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 24,006
AFS Unrealized Losses 210
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 940 $ 865
AFS Unrealized Losses 60 135
Total temporarily impaired securities Fair Value 24,946 865
Total temporarily impaired securities Unrealized Losses $ 270 $ 135
Equities [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 $ 17 $ 17
AFS Unrealized Losses 9 13
Total temporarily impaired securities Fair Value 17 17
Total temporarily impaired securities Unrealized Losses 9 $ 13
States and local governments [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
HTM Fair Value 840
HTM Unrealized Losses $ 6
Securities in an Unrealized Loss Position for More than 12 Months    
HTM Fair Value
HTM Unrealized Losses
Total temporarily impaired securities Fair Value $ 840
Total temporarily impaired securities Unrealized Losses $ 6