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Investment Securities (Amortized Cost And Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | $ 543,992 | $ 543,621
Securities available for sale, Unrealized Gains | 2,928 | 4,599
Securities available for sale, Unrealized Losses | 6,994 | 3,825
Securities available for sale | 539,926 | 544,395
Securities held to maturity, Amortized Cost | 543,338 | 485,717
Securities held to maturity, Unrealized Gains | 2,287 | 6,628
Securities held to maturity, Unrealized Losses | 5,634 | 2,281
Securities held to maturity, fair value | 539,991 | 490,064
U.S. Government Agencies And Government Sponsored Enterprises [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 187,325 | 260,748
Securities available for sale, Unrealized Gains | 512 | 1,164
Securities available for sale, Unrealized Losses | 1,569 | 1,049
Securities available for sale | 186,268 | 260,863
State And Political Subdivisions [Member] |  |
Investment [Line Items] |  |
Securities held to maturity, Amortized Cost | 305,248 | 294,423
Securities held to maturity, Unrealized Gains | 2,127 | 6,562
Securities held to maturity, Unrealized Losses | 1,616 | 4
Securities held to maturity, fair value | 305,759 | 300,981
Collateralized Mortgage Obligations [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 16,921 | 16,998
Securities available for sale, Unrealized Gains | 74 | 90
Securities available for sale, Unrealized Losses | 125 | 154
Securities available for sale | 16,870 | 16,934
Securities held to maturity, Amortized Cost | 83,929 | 56,791
Securities held to maturity, Unrealized Gains | 21 |
Securities held to maturity, Unrealized Losses | 1,573 | 818
Securities held to maturity, fair value | 82,377 | 55,973
Collateralized Mortgage Obligations [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 5,142 | 5,175
Securities available for sale, Unrealized Gains |  | 1
Securities available for sale, Unrealized Losses | 65 | 91
Securities available for sale | 5,077 | 5,085
Securities held to maturity, Amortized Cost | 101,025 | 80,570
Securities held to maturity, Unrealized Gains | 80 |
Securities held to maturity, Unrealized Losses | 1,827 | 1,120
Securities held to maturity, fair value | 99,278 | 79,450
Collateralized Mortgage Obligations [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities held to maturity, Amortized Cost | 14,909 | 19,084
Securities held to maturity, Unrealized Gains | 40 | 19
Securities held to maturity, Unrealized Losses | 162 | 101
Securities held to maturity, fair value | 14,787 | 19,002
Collateralized Mortgage Obligations [Member] | Privately Issued [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Unrealized Gains | 824 | 809
Securities available for sale | 824 | 809
Mortgage-Backed Securities [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 356,667 | 282,873
Securities available for sale, Unrealized Gains | 2,225 | 3,217
Securities available for sale, Unrealized Losses | 5,425 | 2,776
Securities available for sale | 353,467 | 283,314
Securities held to maturity, Amortized Cost | 238,090 | 191,294
Securities held to maturity, Unrealized Gains | 160 | 66
Securities held to maturity, Unrealized Losses | 4,018 | 2,277
Securities held to maturity, fair value | 234,232 | 189,083
Mortgage-Backed Securities [Member] | Federal National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 288,949 | 209,671
Securities available for sale, Unrealized Gains | 897 | 1,092
Securities available for sale, Unrealized Losses | 4,413 | 2,333
Securities available for sale | 285,433 | 208,430
Securities held to maturity, Amortized Cost | 10,362 | 9,242
Securities held to maturity, Unrealized Gains | 1 | 14
Securities held to maturity, Unrealized Losses | 124 | 79
Securities held to maturity, fair value | 10,239 | 9,177
Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 30,182 | 24,564
Securities available for sale, Unrealized Gains | 114 | 282
Securities available for sale, Unrealized Losses | 807 | 194
Securities available for sale | 29,489 | 24,652
Securities held to maturity, Amortized Cost | 3,290 |
Securities held to maturity, Unrealized Losses | 150 |
Securities held to maturity, fair value | 3,140 |
Mortgage-Backed Securities [Member] | Government National Mortgage Association [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Amortized Cost | 15,473 | 26,465
Securities available for sale, Unrealized Gains | 316 | 943
Securities available for sale, Unrealized Losses | 15 | 4
Securities available for sale | 15,774 | 27,404
Securities held to maturity, Amortized Cost | 24,575 | 25,607
Securities held to maturity, Unrealized Gains | 18 | 33
Securities held to maturity, Unrealized Losses | 182 | 159
Securities held to maturity, fair value | 24,411 | 25,481
Asset-Backed Securities [Member] |  |
Investment [Line Items] |  |
Securities available for sale, Unrealized Gains | 191 | 218
Securities available for sale | $ 191 | $ 218

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