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Securities (Schedule of Information Regarding Securities with Unrealized Losses) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Securities in an Unrealized Loss Position for Less than 12 Months    
Total temporarily impaired securities Fair Value $ 15,909 $ 181,692
Total temporarily impaired securities Unrealized Losses 29 1,371
Securities in an Unrealized Loss Position for More than 12 Months    
Total temporarily impaired securities Fair Value 24,186 31,395
Total temporarily impaired securities Unrealized Losses 343 954
Total temporarily impaired securities Fair Value 40,095 213,087
Total temporarily impaired securities Unrealized Losses 372 2,325
Government-sponsored enterprise securities [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 9,992 5,993
AFS Unrealized Losses 7 7
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 2,997 2,978
AFS Unrealized Losses 3 22
Total temporarily impaired securities Fair Value 12,989 8,971
Total temporarily impaired securities Unrealized Losses 10 29
Mortgage-backed securities [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 5,917 150,853
AFS Unrealized Losses 22 1,148
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 20,242 27,460
AFS Unrealized Losses 262 863
Total temporarily impaired securities Fair Value 26,159 178,313
Total temporarily impaired securities Unrealized Losses 284 2,011
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 930 940
AFS Unrealized Losses 70 60
Total temporarily impaired securities Fair Value 930 24,946
Total temporarily impaired securities Unrealized Losses 70 270
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 17 17
AFS Unrealized Losses 8 9
Total temporarily impaired securities Fair Value 17 17
Total temporarily impaired securities Unrealized Losses 8 9
State 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    
AFS Fair Value
AFS Unrealized Losses  
HTM Fair Value
HTM Unrealized Losses
Total temporarily impaired securities Fair Value 840
Total temporarily impaired securities Unrealized Losses $ 6