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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, 2015
Dec. 31, 2014
Securities in an Unrealized Loss Position for Less than 12 Months    
Total temporarily impaired securities Fair Value $ 196,149 $ 75,474
Total temporarily impaired securities Unrealized Losses 1,627 329
Securities in an Unrealized Loss Position for More than 12 Months    
Total temporarily impaired securities Fair Value 33,657 37,392
Total temporarily impaired securities Unrealized Losses 1,125 1,299
Total temporarily impaired securities Fair Value 229,806 112,866
Total temporarily impaired securities Unrealized Losses 2,752 1,628
Government-sponsored enterprises securities [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 13,955 5,489
AFS Unrealized Losses 45 11
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 2,977 2,953
AFS Unrealized Losses 23 47
Total temporarily impaired securities Fair Value 16,932 8,442
Total temporarily impaired securities Unrealized Losses 68 58
Mortgage-backed securities [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 161,589 69,985
AFS Unrealized Losses 1,102 318
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 29,740 33,557
AFS Unrealized Losses 1,010 1,104
Total temporarily impaired securities Fair Value 191,329 103,542
Total temporarily impaired securities Unrealized Losses 2,112 $ 1,422
Corporate bonds [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 19,773  
AFS Unrealized Losses 458  
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 920 $ 865
AFS Unrealized Losses 80 135
Total temporarily impaired securities Fair Value 20,693 865
Total temporarily impaired securities Unrealized Losses $ 538 $ 135
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 $ 20 $ 17
AFS Unrealized Losses 12 13
Total temporarily impaired securities Fair Value 20 17
Total temporarily impaired securities Unrealized Losses 12 $ 13
States and local governments [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
HTM Fair Value 832  
HTM Unrealized Losses $ 22  
Securities in an Unrealized Loss Position for More than 12 Months    
HTM Fair Value    
HTM Unrealized Losses    
Total temporarily impaired securities Fair Value $ 832  
Total temporarily impaired securities Unrealized Losses $ 22