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Securities (Schedule of Information Regarding Securities with Unrealized Losses) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Securities in an Unrealized Loss Position for Less than 12 Months    
Total temporarily impaired securities Fair Value $ 108,745 $ 214,027
Total temporarily impaired securities Unrealized Losses 863 1,782
Securities in an Unrealized Loss Position for More than 12 Months    
Total temporarily impaired securities Fair Value 320,445 128,965
Total temporarily impaired securities Unrealized Losses 13,561 1,972
Total temporarily impaired securities Fair Value 429,190 342,992
Total temporarily impaired securities Unrealized Losses 14,424 3,754
Government-sponsored enterprise securities [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 4,921 10,897
AFS Unrealized Losses 78 103
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 13,682 2,970
AFS Unrealized Losses 318 30
Total temporarily impaired securities Fair Value 18,603 13,867
Total temporarily impaired securities Unrealized Losses 396 133
Mortgage-backed securities [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 82,525 192,702
AFS Unrealized Losses 351 1,582
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 294,305 125,060
AFS Unrealized Losses 12,939 1,877
Total temporarily impaired securities Fair Value 376,830 317,762
Total temporarily impaired securities Unrealized Losses 13,290 3,459
Corporate bonds [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 20,704 2,500
AFS Unrealized Losses 433 49
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 5,817 935
AFS Unrealized Losses 256 65
Total temporarily impaired securities Fair Value 26,521 3,435
Total temporarily impaired securities Unrealized Losses 689 114
State and local governments [Member]    
Securities in an Unrealized Loss Position for Less than 12 Months    
AFS Fair Value 595 7,928
AFS Unrealized Losses 1 48
Securities in an Unrealized Loss Position for More than 12 Months    
AFS Fair Value 6,641
AFS Unrealized Losses 48
Total temporarily impaired securities Fair Value 7,236 7,928
Total temporarily impaired securities Unrealized Losses $ 49 $ 48