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Investment Securities (Investments Gross Unrealized Losses And Fair Value) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value $ 319,678 $ 363,419
Securities available for sale, Less than 12 months, Unrealized Losses 2,618 6,991
Securities available for sale, 12 months or longer, Fair Value 115,552 1,458
Securities available for sale, 12 months or longer, Unrealized Losses 2,548 3
Securities available for sale, Fair Value, Total 435,230 364,877
Securities available for sale, Unrealized Losses, Total 5,166 6,994
Securities held to maturity, Less than 12 months, Fair Value 113,419 279,439
Securities held to maturity, Less than 12 months, Unrealized Losses 1,339 5,618
Securities held to maturity, 12 months or longer, Fair Value 159,211 4,068
Securities held to maturity, 12 months or longer, Unrealized Losses 4,485 16
Securities held to maturity, Fair Value, Total 272,630 283,507
Securities held to maturity, Unrealized Losses, Total 5,824 5,634
Total Securities, Less than 12 months, Fair Value 433,097 642,858
Total Securities, Less than 12 months, Unrealized Losses 3,957 12,609
Total Securities, 12 months or longer, Fair Value 274,763 5,526
Total Securities, 12 months or longer, Unrealized Losses 7,033 19
Total Securities, Fair Value 707,860 648,384
Total Securities, Unrealized Losses 10,990 12,628
U.S. Government Agencies And Government Sponsored Enterprises [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 95,046 113,261
Securities available for sale, Less than 12 months, Unrealized Losses 571 1,566
Securities available for sale, 12 months or longer, Fair Value 31,561 1,458
Securities available for sale, 12 months or longer, Unrealized Losses 687 3
Securities available for sale, Fair Value, Total 126,607 114,719
Securities available for sale, Unrealized Losses, Total 1,258 1,569
State And Political Subdivisions [Member]    
Investment [Line Items]    
Securities held to maturity, Less than 12 months, Fair Value 36,368 82,644
Securities held to maturity, Less than 12 months, Unrealized Losses 295 1,616
Securities held to maturity, 12 months or longer, Fair Value 14,492  
Securities held to maturity, 12 months or longer, Unrealized Losses 367  
Securities held to maturity, Fair Value, Total 50,860 82,644
Securities held to maturity, Unrealized Losses, Total 662 1,616
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value   8,119
Securities available for sale, Less than 12 months, Unrealized Losses   125
Securities available for sale, 12 months or longer, Fair Value 119  
Securities available for sale, 12 months or longer, Unrealized Losses 1  
Securities available for sale, Fair Value, Total 119 8,119
Securities available for sale, Unrealized Losses, Total 1 125
Securities held to maturity, Less than 12 months, Fair Value 16,830 72,734
Securities held to maturity, Less than 12 months, Unrealized Losses 202 1,560
Securities held to maturity, 12 months or longer, Fair Value 57,645 3,107
Securities held to maturity, 12 months or longer, Unrealized Losses 1,756 13
Securities held to maturity, Fair Value, Total 74,475 75,841
Securities held to maturity, Unrealized Losses, Total 1,958 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   5,077
Securities available for sale, Less than 12 months, Unrealized Losses   65
Securities available for sale, 12 months or longer, Fair Value 8  
Securities available for sale, Fair Value, Total 8 5,077
Securities available for sale, Unrealized Losses, Total   65
Securities held to maturity, Less than 12 months, Fair Value 23,727 92,256
Securities held to maturity, Less than 12 months, Unrealized Losses 337 1,825
Securities held to maturity, 12 months or longer, Fair Value 66,467 430
Securities held to maturity, 12 months or longer, Unrealized Losses 1,828 2
Securities held to maturity, Fair Value, Total 90,194 92,686
Securities held to maturity, Unrealized Losses, Total 2,165 1,827
Collateralized Mortgage Obligations [Member] | Government National Mortgage Association [Member]    
Investment [Line Items]    
Securities held to maturity, Less than 12 months, Fair Value 15,401 8,675
Securities held to maturity, Less than 12 months, Unrealized Losses 340 161
Securities held to maturity, 12 months or longer, Fair Value 5,635 531
Securities held to maturity, 12 months or longer, Unrealized Losses 162 1
Securities held to maturity, Fair Value, Total 21,036 9,206
Securities held to maturity, Unrealized Losses, Total 502 162
Mortgage-Backed Securities [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 224,632 250,158
Securities available for sale, Less than 12 months, Unrealized Losses 2,047 5,425
Securities available for sale, 12 months or longer, Fair Value 83,991  
Securities available for sale, 12 months or longer, Unrealized Losses 1,861  
Securities available for sale, Fair Value, Total 308,623 250,158
Securities available for sale, Unrealized Losses, Total 3,908 5,425
Securities held to maturity, Less than 12 months, Fair Value 77,051 196,795
Securities held to maturity, Less than 12 months, Unrealized Losses 1,044 4,002
Securities held to maturity, 12 months or longer, Fair Value 144,719 4,068
Securities held to maturity, 12 months or longer, Unrealized Losses 4,118 16
Securities held to maturity, Fair Value, Total 221,770 200,863
Securities held to maturity, Unrealized Losses, Total 5,162 4,018
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 201,754 211,491
Securities available for sale, Less than 12 months, Unrealized Losses 1,855 4,413
Securities available for sale, 12 months or longer, Fair Value 67,383  
Securities available for sale, 12 months or longer, Unrealized Losses 1,365  
Securities available for sale, Fair Value, Total 269,137 211,491
Securities available for sale, Unrealized Losses, Total 3,220 4,413
Securities held to maturity, Less than 12 months, Fair Value 3,766 9,253
Securities held to maturity, Less than 12 months, Unrealized Losses 29 124
Securities held to maturity, 12 months or longer, Fair Value 2,694  
Securities held to maturity, 12 months or longer, Unrealized Losses 59  
Securities held to maturity, Fair Value, Total 6,460 9,253
Securities held to maturity, Unrealized Losses, Total 88 124
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 20,446 24,360
Securities available for sale, Less than 12 months, Unrealized Losses 192 807
Securities available for sale, 12 months or longer, Fair Value 15,601  
Securities available for sale, 12 months or longer, Unrealized Losses 483  
Securities available for sale, Fair Value, Total 36,047 24,360
Securities available for sale, Unrealized Losses, Total 675 807
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, 12 months or longer, Fair Value 3,094  
Securities held to maturity, 12 months or longer, Unrealized Losses 119  
Securities held to maturity, Fair Value, Total 3,094 3,141
Securities held to maturity, Unrealized Losses, Total 119 150
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member]    
Investment [Line Items]    
Securities available for sale, Less than 12 months, Fair Value 2,432 1,111
Securities available for sale, Less than 12 months, Unrealized Losses   15
Securities available for sale, 12 months or longer, Fair Value 880  
Securities available for sale, 12 months or longer, Unrealized Losses 12  
Securities available for sale, Fair Value, Total 3,312 1,111
Securities available for sale, Unrealized Losses, Total 12 15
Securities held to maturity, Less than 12 months, Fair Value 17,327 10,736
Securities held to maturity, Less than 12 months, Unrealized Losses 136 182
Securities held to maturity, 12 months or longer, Fair Value 9,184  
Securities held to maturity, 12 months or longer, Unrealized Losses 194  
Securities held to maturity, Fair Value, Total 26,511 10,736
Securities held to maturity, Unrealized Losses, Total $ 330 $ 182