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Investment Securities (Investments Gross Unrealized Losses And Fair Value) (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value $ 345,890 $ 363,419
Securities available for sale, Less than 12 months, Unrealized Losses 5,989 6,991
Securities available for sale, 12 months or longer, Fair Value 2,520 1,458
Securities available for sale, 12 months or longer, Unrealized Losses 21 3
Securities available for sale, Fair Value, Total 348,410 364,877
Securities available for sale, Unrealized Losses, Total 6,010 6,994
Securities held to maturity, Less than 12 months, Fair Value 248,041 279,439
Securities held to maturity, Less than 12 months, Unrealized Losses 4,780 5,618
Securities held to maturity, 12 months or longer, Fair Value 3,677 4,068
Securities held to maturity, 12 months or longer, Unrealized Losses 16 16
Securities held to maturity, Fair Value, Total 251,718 283,507
Securities held to maturity, Unrealized Losses, Total 4,796 5,634
Total Securities, Less than 12 months, Fair Value 593,931 642,858
Total Securities, Less than 12 months, Unrealized Losses 10,769 12,609
Total Securities, 12 months or longer, Fair Value 6,197 5,526
Total Securities, 12 months or longer, Unrealized Losses 37 19
Total Securities, Fair Value 600,128 648,384
Total Securities, Unrealized Losses 10,806 12,628
U.S. Government Agencies And Government Sponsored Enterprises [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 96,026 113,261
Securities available for sale, Less than 12 months, Unrealized Losses 1,171 1,566
Securities available for sale, 12 months or longer, Fair Value 1,412 1,458
Securities available for sale, 12 months or longer, Unrealized Losses 2 3
Securities available for sale, Fair Value, Total 97,438 114,719
Securities available for sale, Unrealized Losses, Total 1,173 1,569
State And Political Subdivisions [Member]    
Investment [Line Items]    
Securities held to maturity, Less than 12 months, Fair Value 47,118 82,644
Securities held to maturity, Less than 12 months, Unrealized Losses 892 1,616
Securities held to maturity, Fair Value, Total 47,118 82,644
Securities held to maturity, Unrealized Losses, Total 892 1,616
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 252 8,119
Securities available for sale, Less than 12 months, Unrealized Losses 1 125
Securities available for sale, 12 months or longer, Fair Value 55  
Securities available for sale, 12 months or longer, Unrealized Losses 1  
Securities available for sale, Fair Value, Total 307 8,119
Securities available for sale, Unrealized Losses, Total 2 125
Securities held to maturity, Less than 12 months, Fair Value 67,013 72,734
Securities held to maturity, Less than 12 months, Unrealized Losses 1,420 1,560
Securities held to maturity, 12 months or longer, Fair Value 2,700 3,107
Securities held to maturity, 12 months or longer, Unrealized Losses 13 13
Securities held to maturity, Fair Value, Total 69,713 75,841
Securities held to maturity, Unrealized Losses, Total 1,433 1,573
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 59 5,077
Securities available for sale, Less than 12 months, Unrealized Losses 1 65
Securities available for sale, Fair Value, Total 59 5,077
Securities available for sale, Unrealized Losses, Total 1 65
Securities held to maturity, Less than 12 months, Fair Value 87,601 92,256
Securities held to maturity, Less than 12 months, Unrealized Losses 1,789 1,825
Securities held to maturity, 12 months or longer, Fair Value 672 430
Securities held to maturity, 12 months or longer, Unrealized Losses 2 2
Securities held to maturity, Fair Value, Total 88,273 92,686
Securities held to maturity, Unrealized Losses, Total 1,791 1,827
Collateralized Mortgage Obligations [Member] | Government National Mortgage Association [Member]    
Investment [Line Items]    
Securities held to maturity, Less than 12 months, Fair Value 8,042 8,675
Securities held to maturity, Less than 12 months, Unrealized Losses 148 161
Securities held to maturity, 12 months or longer, Fair Value 305 531
Securities held to maturity, 12 months or longer, Unrealized Losses 1 1
Securities held to maturity, Fair Value, Total 8,347 9,206
Securities held to maturity, Unrealized Losses, Total 149 162
Mortgage-Backed Securities [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 249,864 250,158
Securities available for sale, Less than 12 months, Unrealized Losses 4,818 5,425
Securities available for sale, 12 months or longer, Fair Value 1,108  
Securities available for sale, 12 months or longer, Unrealized Losses 19  
Securities available for sale, Fair Value, Total 250,972 250,158
Securities available for sale, Unrealized Losses, Total 4,837 5,425
Securities held to maturity, Less than 12 months, Fair Value 200,923 196,795
Securities held to maturity, Less than 12 months, Unrealized Losses 3,888 4,002
Securities held to maturity, 12 months or longer, Fair Value 3,677 4,068
Securities held to maturity, 12 months or longer, Unrealized Losses 16 16
Securities held to maturity, Fair Value, Total 204,600 200,863
Securities held to maturity, Unrealized Losses, Total 3,904 4,018
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 220,754 211,491
Securities available for sale, Less than 12 months, Unrealized Losses 4,008 4,413
Securities available for sale, Fair Value, Total 220,754 211,491
Securities available for sale, Unrealized Losses, Total 4,008 4,413
Securities held to maturity, Less than 12 months, Fair Value 10,169 9,253
Securities held to maturity, Less than 12 months, Unrealized Losses 121 124
Securities held to maturity, Fair Value, Total 10,169 9,253
Securities held to maturity, Unrealized Losses, Total 121 124
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 28,799 24,360
Securities available for sale, Less than 12 months, Unrealized Losses 808 807
Securities available for sale, Fair Value, Total 28,799 24,360
Securities available for sale, Unrealized Losses, Total 808 807
Securities held to maturity, Less than 12 months, Fair Value 3,116 3,141
Securities held to maturity, Less than 12 months, Unrealized Losses 154 150
Securities held to maturity, Fair Value, Total 3,116 3,141
Securities held to maturity, Unrealized Losses, Total 154 150
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value   1,111
Securities available for sale, Less than 12 months, Unrealized Losses   15
Securities available for sale, 12 months or longer, Fair Value 1,053  
Securities available for sale, 12 months or longer, Unrealized Losses 18  
Securities available for sale, Fair Value, Total 1,053 1,111
Securities available for sale, Unrealized Losses, Total 18 15
Securities held to maturity, Less than 12 months, Fair Value 24,982 10,736
Securities held to maturity, Less than 12 months, Unrealized Losses 256 182
Securities held to maturity, Fair Value, Total 24,982 10,736
Securities held to maturity, Unrealized Losses, Total $ 256 $ 182