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Investment Securities (Investments' Gross Unrealized Losses And Fair Value) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value $ 11,681 $ 232,913
Securities available for sale, Less than 12 months, Unrealized Losses 19 3,312
Securities available for sale, 12 months or longer, Fair Value 1,637 35,864
Securities available for sale, 12 months or longer, Unrealized Losses 4 513
Securities available for sale, Fair Value, Total 13,318 268,777
Securities available for sale, Unrealized Losses, Total 23 3,825
Securities held to maturity, Less than 12 months, Fair Value 9,842 167,386
Securities held to maturity, Less than 12 months, Unrealized Losses 18 2,281
Securities held to maturity, 12 months or longer, Fair Value 1,635  
Securities held to maturity, 12 months or longer, Unrealized Losses 4  
Securities held to maturity, Fair Value, Total 11,477 167,386
Securities held to maturity, Unrealized Losses, Total 22 2,281
Total Securities, Less than 12 months, Fair Value 21,523 400,299
Total Securities, Less than 12 months, Unrealized Losses 37 5,593
Total Securities, 12 months or longer, Fair Value 3,272 35,864
Total Securities, 12 months or longer, Unrealized Losses 8 513
Total Securities, Fair Value 24,795 436,163
Total Securities, Unrealized Losses 45 6,106
U.S. Government Agencies And Government Sponsored Enterprises [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 9,997 82,298
Securities available for sale, Less than 12 months, Unrealized Losses 3 735
Securities available for sale, 12 months or longer, Fair Value 1,637 26,302
Securities available for sale, 12 months or longer, Unrealized Losses 4 314
Securities available for sale, Fair Value, Total 11,634 108,600
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 832 3,075
Securities held to maturity, Less than 12 months, Unrealized Losses 1 4
Securities held to maturity, Fair Value, Total 832 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 362 7,778
Securities available for sale, Less than 12 months, Unrealized Losses 1 154
Securities available for sale, Fair Value, Total 362 7,778
Securities available for sale, Unrealized Losses, Total 1 154
Securities held to maturity, Less than 12 months, Fair Value 4,119 55,973
Securities held to maturity, Less than 12 months, Unrealized Losses 11 818
Securities held to maturity, Fair Value, Total 4,119 55,973
Securities held to maturity, Unrealized Losses, Total 11 818
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 64 4,998
Securities available for sale, Less than 12 months, Unrealized Losses 1 91
Securities available for sale, Fair Value, Total 64 4,998
Securities available for sale, Unrealized Losses, Total 1 91
Securities held to maturity, Less than 12 months, Fair Value 1,196 79,323
Securities held to maturity, Less than 12 months, Unrealized Losses 2 1,120
Securities held to maturity, Fair Value, Total 1,196 79,323
Securities held to maturity, Unrealized Losses, Total 2 1,120
Collateralized Mortgage Obligations [Member] | Government National Mortgage Association [Member]    
Investment [Line Items]    
Securities held to maturity, Less than 12 months, Fair Value 3,695 14,559
Securities held to maturity, Less than 12 months, Unrealized Losses 4 101
Securities held to maturity, Fair Value, Total 3,695 14,559
Securities held to maturity, Unrealized Losses, Total 4 101
Mortgage-Backed Securities [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 1,684 150,615
Securities available for sale, Less than 12 months, Unrealized Losses 16 2,577
Securities available for sale, 12 months or longer, Fair Value   9,562
Securities available for sale, 12 months or longer, Unrealized Losses   199
Securities available for sale, Fair Value, Total 1,684 160,177
Securities available for sale, Unrealized Losses, Total 16 2,776
Securities held to maturity, Less than 12 months, Fair Value 9,010 164,311
Securities held to maturity, Less than 12 months, Unrealized Losses 17 2,277
Securities held to maturity, 12 months or longer, Fair Value 1,635  
Securities held to maturity, 12 months or longer, Unrealized Losses 4  
Securities held to maturity, Fair Value, Total 10,645 164,311
Securities held to maturity, Unrealized Losses, Total 21 2,277
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value   123,774
Securities available for sale, Less than 12 months, Unrealized Losses   2,134
Securities available for sale, 12 months or longer, Fair Value   9,562
Securities available for sale, 12 months or longer, Unrealized Losses   199
Securities available for sale, Fair Value, Total   133,336
Securities available for sale, Unrealized Losses, Total   2,333
Securities held to maturity, Less than 12 months, Fair Value   5,666
Securities held to maturity, Less than 12 months, Unrealized Losses   79
Securities held to maturity, Fair Value, Total   5,666
Securities held to maturity, Unrealized Losses, Total   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, Fair Value, Total   12,660
Securities available for sale, Unrealized Losses, Total   194
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 1,258 1,405
Securities available for sale, Less than 12 months, Unrealized Losses 14 4
Securities available for sale, Fair Value, Total 1,258 1,405
Securities available for sale, Unrealized Losses, Total 14 4
Securities held to maturity, Less than 12 months, Fair Value   8,790
Securities held to maturity, Less than 12 months, Unrealized Losses   159
Securities held to maturity, 12 months or longer, Fair Value 1,635  
Securities held to maturity, 12 months or longer, Unrealized Losses 4  
Securities held to maturity, Fair Value, Total 1,635 8,790
Securities held to maturity, Unrealized Losses, Total $ 4 $ 159