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Investment Securities (Investments' Gross Unrealized Losses And Fair Value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value $ 13,821 $ 232,913
Securities available for sale, Less than 12 months, Unrealized Losses 16 3,312
Securities available for sale, 12 months or longer, Fair Value 27,521 35,864
Securities available for sale, 12 months or longer, Unrealized Losses 84 513
Securities available for sale, Fair Value, Total 41,342 268,777
Securities available for sale, Unrealized Losses, Total 100 3,825
Securities held to maturity, Less than 12 months, Fair Value 23,425 167,386
Securities held to maturity, Less than 12 months, Unrealized Losses 42 2,281
Securities held to maturity, 12 months or longer, Fair Value 3,773  
Securities held to maturity, 12 months or longer, Unrealized Losses 29  
Securities held to maturity, Fair Value, Total 27,198 167,386
Securities held to maturity, Unrealized Losses, Total 71 2,281
Total Securities, Less than 12 months, Fair Value 37,246 400,299
Total Securities, Less than 12 months, Unrealized Losses 58 5,593
Total Securities, 12 months or longer, Fair Value 31,294 35,864
Total Securities, 12 months or longer, Unrealized Losses 113 513
Total Securities, Fair Value 68,540 436,163
Total Securities, Unrealized Losses 171 6,106
U.S. Government Agencies And Government Sponsored Enterprises [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 391 82,298
Securities available for sale, Less than 12 months, Unrealized Losses 1 735
Securities available for sale, 12 months or longer, Fair Value 7,482 26,302
Securities available for sale, 12 months or longer, Unrealized Losses 6 314
Securities available for sale, Fair Value, Total 7,873 108,600
Securities available for sale, Unrealized Losses, Total 7 1,049
State And Political Subdivisions [Member]    
Investment [Line Items]    
Securities held to maturity, Less than 12 months, Fair Value 2,477 3,075
Securities held to maturity, Less than 12 months, Unrealized Losses 1 4
Securities held to maturity, Fair Value, Total 2,477 3,075
Securities held to maturity, Unrealized Losses, Total 1 4
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value   7,778
Securities available for sale, Less than 12 months, Unrealized Losses   154
Securities available for sale, Fair Value, Total   7,778
Securities available for sale, Unrealized Losses, Total   154
Securities held to maturity, Less than 12 months, Fair Value 6,895 55,973
Securities held to maturity, Less than 12 months, Unrealized Losses 15 818
Securities held to maturity, Fair Value, Total 6,895 55,973
Securities held to maturity, Unrealized Losses, Total 15 818
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value   4,998
Securities available for sale, Less than 12 months, Unrealized Losses   91
Securities available for sale, Fair Value, Total   4,998
Securities available for sale, Unrealized Losses, Total   91
Securities held to maturity, Less than 12 months, Fair Value 5,100 79,323
Securities held to maturity, Less than 12 months, Unrealized Losses 5 1,120
Securities held to maturity, Fair Value, Total 5,100 79,323
Securities held to maturity, Unrealized Losses, Total 5 1,120
Collateralized Mortgage Obligations [Member] | Government National Mortgage Association [Member]    
Investment [Line Items]    
Securities held to maturity, Less than 12 months, Fair Value 3,366 14,559
Securities held to maturity, Less than 12 months, Unrealized Losses 7 101
Securities held to maturity, Fair Value, Total 3,366 14,559
Securities held to maturity, Unrealized Losses, Total 7 101
Mortgage-Backed Securities [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 13,430 150,615
Securities available for sale, Less than 12 months, Unrealized Losses 15 2,577
Securities available for sale, 12 months or longer, Fair Value 20,039 9,562
Securities available for sale, 12 months or longer, Unrealized Losses 78 199
Securities available for sale, Fair Value, Total 33,469 160,177
Securities available for sale, Unrealized Losses, Total 93 2,776
Securities held to maturity, Less than 12 months, Fair Value 20,948 164,311
Securities held to maturity, Less than 12 months, Unrealized Losses 41 2,277
Securities held to maturity, 12 months or longer, Fair Value 3,773  
Securities held to maturity, 12 months or longer, Unrealized Losses 29  
Securities held to maturity, Fair Value, Total 24,721 164,311
Securities held to maturity, Unrealized Losses, Total 70 2,277
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 12,098 123,774
Securities available for sale, Less than 12 months, Unrealized Losses 3 2,134
Securities available for sale, 12 months or longer, Fair Value 15,781 9,562
Securities available for sale, 12 months or longer, Unrealized Losses 50 199
Securities available for sale, Fair Value, Total 27,879 133,336
Securities available for sale, Unrealized Losses, Total 53 2,333
Securities held to maturity, Less than 12 months, Fair Value 1,362 5,666
Securities held to maturity, Less than 12 months, Unrealized Losses 2 79
Securities held to maturity, Fair Value, Total 1,362 5,666
Securities held to maturity, Unrealized Losses, Total 2 79
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value   12,660
Securities available for sale, Less than 12 months, Unrealized Losses   194
Securities available for sale, 12 months or longer, Fair Value 4,258  
Securities available for sale, 12 months or longer, Unrealized Losses 28  
Securities available for sale, Fair Value, Total 4,258 12,660
Securities available for sale, Unrealized Losses, Total 28 194
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 1,332 1,405
Securities available for sale, Less than 12 months, Unrealized Losses 12 4
Securities available for sale, Fair Value, Total 1,332 1,405
Securities available for sale, Unrealized Losses, Total 12 4
Securities held to maturity, Less than 12 months, Fair Value 4,225 8,790
Securities held to maturity, Less than 12 months, Unrealized Losses 12 159
Securities held to maturity, 12 months or longer, Fair Value 3,773  
Securities held to maturity, 12 months or longer, Unrealized Losses 29  
Securities held to maturity, Fair Value, Total 7,998 8,790
Securities held to maturity, Unrealized Losses, Total $ 41 $ 159