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Securities (Schedule of Information Regarding Securities with Unrealized Losses) (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Securities in an Unrealized Loss Position for Less than 12 Months    
Total temporarily impaired securities Fair Value $ 17,194 $ 181,692
Total temporarily impaired securities Unrealized Losses 108 1,371
Securities in an Unrealized Loss Position for More than 12 Months    
Total temporarily impaired securities Fair Value 18,014 31,395
Total temporarily impaired securities Unrealized Losses 288 954
Total temporarily impaired securities Fair Value 35,208 213,087
Total temporarily impaired securities Unrealized Losses 396 2,325
Government-sponsored enterprise securities [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 2,999 5,993
AFS Unrealized Losses 1 7
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 2,978
AFS Unrealized Losses 22
Total AFS Fair Value 2,999 8,971
Total AFS Unrealized Losses 1 29
Mortgage-backed securities [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 11,695 150,853
AFS Unrealized Losses 49 1,148
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 17,069 27,460
AFS Unrealized Losses 216 863
Total AFS Fair Value 28,764 178,313
Total AFS Unrealized Losses 265 2,011
Corporate bonds [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 2,500 24,006
AFS Unrealized Losses 58 210
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 935 940
AFS Unrealized Losses 65 60
Total AFS Fair Value 3,435 24,946
Total AFS Unrealized Losses 123 270
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 10 17
AFS Unrealized Losses 7 9
Total AFS Fair Value 10 17
Total AFS Unrealized Losses 7 9
State and local governments [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 840
AFS Unrealized Losses 6
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value
AFS Unrealized Losses
Total AFS Fair Value 840
Total AFS Unrealized Losses $ 6