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Investment Securities (Investments' Gross Unrealized Losses And Fair Value) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value $ 363,419 $ 232,913
Securities available for sale, Less than 12 months, Unrealized Losses 6,991 3,312
Securities available for sale, 12 months or longer, Fair Value 1,458 35,864
Securities available for sale, 12 months or longer, Unrealized Losses 3 513
Securities available for sale, Fair Value, Total 364,877 268,777
Securities available for sale, Unrealized Losses, Total 6,994 3,825
Securities held to maturity, Less than 12 months, Fair Value 279,439 167,386
Securities held to maturity, Less than 12 months, Unrealized Losses 5,618 2,281
Securities held to maturity, 12 months or longer, Fair Value 4,068  
Securities held to maturity, 12 months or longer, Unrealized Losses 16  
Securities held to maturity, Fair Value, Total 283,507 167,386
Securities held to maturity, Unrealized Losses, Total 5,634 2,281
Total Securities, Less than 12 months, Fair Value 642,858 400,299
Total Securities, Less than 12 months, Unrealized Losses 12,609 5,593
Total Securities, 12 months or longer, Fair Value 5,526 35,864
Total Securities, 12 months or longer, Unrealized Losses 19 513
Total Securities, Fair Value 648,384 436,163
Total Securities, Unrealized Losses 12,628 6,106
U.S. Government Agencies And Government Sponsored Enterprises [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 113,261 82,298
Securities available for sale, Less than 12 months, Unrealized Losses 1,566 735
Securities available for sale, 12 months or longer, Fair Value 1,458 26,302
Securities available for sale, 12 months or longer, Unrealized Losses 3 314
Securities available for sale, Fair Value, Total 114,719 108,600
Securities available for sale, Unrealized Losses, Total 1,569 1,049
State And Political Subdivisions [Member]    
Investment [Line Items]    
Securities held to maturity, Less than 12 months, Fair Value 82,644 3,075
Securities held to maturity, Less than 12 months, Unrealized Losses 1,616 4
Securities held to maturity, Fair Value, Total 82,644 3,075
Securities held to maturity, Unrealized Losses, Total 1,616 4
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 8,119 7,778
Securities available for sale, Less than 12 months, Unrealized Losses 125 154
Securities available for sale, Fair Value, Total 8,119 7,778
Securities available for sale, Unrealized Losses, Total 125 154
Securities held to maturity, Less than 12 months, Fair Value 72,734 55,973
Securities held to maturity, Less than 12 months, Unrealized Losses 1,560 818
Securities held to maturity, 12 months or longer, Fair Value 3,107  
Securities held to maturity, 12 months or longer, Unrealized Losses 13  
Securities held to maturity, Fair Value, Total 75,841 55,973
Securities held to maturity, Unrealized Losses, Total 1,573 818
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 5,077 4,998
Securities available for sale, Less than 12 months, Unrealized Losses 65 91
Securities available for sale, Fair Value, Total 5,077 4,998
Securities available for sale, Unrealized Losses, Total 65 91
Securities held to maturity, Less than 12 months, Fair Value 92,256 79,323
Securities held to maturity, Less than 12 months, Unrealized Losses 1,825 1,120
Securities held to maturity, 12 months or longer, Fair Value 430  
Securities held to maturity, 12 months or longer, Unrealized Losses 2  
Securities held to maturity, Fair Value, Total 92,686 79,323
Securities held to maturity, Unrealized Losses, Total 1,827 1,120
Collateralized Mortgage Obligations [Member] | Government National Mortgage Association [Member]    
Investment [Line Items]    
Securities held to maturity, Less than 12 months, Fair Value 8,675 14,559
Securities held to maturity, Less than 12 months, Unrealized Losses 161 101
Securities held to maturity, 12 months or longer, Fair Value 531  
Securities held to maturity, 12 months or longer, Unrealized Losses 1  
Securities held to maturity, Fair Value, Total 9,206 14,559
Securities held to maturity, Unrealized Losses, Total 162 101
Mortgage-Backed Securities [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 250,158 150,615
Securities available for sale, Less than 12 months, Unrealized Losses 5,425 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 250,158 160,177
Securities available for sale, Unrealized Losses, Total 5,425 2,776
Securities held to maturity, Less than 12 months, Fair Value 196,795 164,311
Securities held to maturity, Less than 12 months, Unrealized Losses 4,002 2,277
Securities held to maturity, 12 months or longer, Fair Value 4,068  
Securities held to maturity, 12 months or longer, Unrealized Losses 16  
Securities held to maturity, Fair Value, Total 200,863 164,311
Securities held to maturity, Unrealized Losses, Total 4,018 2,277
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 211,491 123,774
Securities available for sale, Less than 12 months, Unrealized Losses 4,413 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 211,491 133,336
Securities available for sale, Unrealized Losses, Total 4,413 2,333
Securities held to maturity, Less than 12 months, Fair Value 9,253 5,666
Securities held to maturity, Less than 12 months, Unrealized Losses 124 79
Securities held to maturity, Fair Value, Total 9,253 5,666
Securities held to maturity, Unrealized Losses, Total 124 79
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 24,360 12,660
Securities available for sale, Less than 12 months, Unrealized Losses 807 194
Securities available for sale, Fair Value, Total 24,360 12,660
Securities available for sale, Unrealized Losses, Total 807 194
Securities held to maturity, Less than 12 months, Fair Value 3,141  
Securities held to maturity, Less than 12 months, Unrealized Losses 150  
Securities held to maturity, Fair Value, Total 3,141  
Securities held to maturity, Unrealized Losses, Total 150  
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 1,111 1,405
Securities available for sale, Less than 12 months, Unrealized Losses 15 4
Securities available for sale, Fair Value, Total 1,111 1,405
Securities available for sale, Unrealized Losses, Total 15 4
Securities held to maturity, Less than 12 months, Fair Value 10,736 8,790
Securities held to maturity, Less than 12 months, Unrealized Losses 182 159
Securities held to maturity, Fair Value, Total 10,736 8,790
Securities held to maturity, Unrealized Losses, Total $ 182 $ 159