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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, 2016
Dec. 31, 2015
Securities in an Unrealized Loss Position for Less than 12 Months    
Total temporarily impaired securities Fair Value $ 131,973 $ 181,692
Total temporarily impaired securities Unrealized Losses 735 1,371
Securities in an Unrealized Loss Position for More than 12 Months    
Total temporarily impaired securities Fair Value 29,087 31,395
Total temporarily impaired securities Unrealized Losses 624 954
Total temporarily impaired securities Fair Value 161,060 213,087
Total temporarily impaired securities Unrealized Losses $ 1,359 2,325
Government-sponsored enterprises securities [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 5,993
AFS Unrealized Losses 7
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value $ 2,994 2,978
AFS Unrealized Losses 6 22
Total temporarily impaired securities Fair Value 2,994 8,971
Total temporarily impaired securities Unrealized Losses 6 29
Mortgage-backed securities [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 117,206 150,853
AFS Unrealized Losses 602 1,148
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 25,136 27,460
AFS Unrealized Losses 549 863
Total temporarily impaired securities Fair Value 142,342 178,313
Total temporarily impaired securities Unrealized Losses 1,151 2,011
Corporate bonds [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 13,926 24,006
AFS Unrealized Losses 131 210
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 940 940
AFS Unrealized Losses 60 60
Total temporarily impaired securities Fair Value 14,866 24,946
Total temporarily impaired securities Unrealized Losses $ 191 $ 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 9 9
Total temporarily impaired securities Fair Value 17 17
Total temporarily impaired securities Unrealized Losses 9 9
States and local governments [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
HTM Fair Value 841 840
HTM Unrealized Losses $ 2 $ 6
Securities in an Unrealized Loss Position for More than 12 Months    
HTM Fair Value
HTM Unrealized Losses
Total temporarily impaired securities Fair Value $ 841 $ 840
Total temporarily impaired securities Unrealized Losses $ 2 $ 6