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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2016
Investment Securities [Abstract] |
Amortized Cost And Fair Value Of Investment Securities |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
December 31, 2016 |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |
U.S. Government agencies and government |  |  |  |  |  |  |  |
sponsored enterprises | $ | 187,325 | $ | 512 | $ | 1,569 | $ | 186,268
Mortgage-backed securities: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 288,949 |  | 897 |  | 4,413 |  | 285,433
Federal Home Loan Mortgage Corporation |  | 30,182 |  | 114 |  | 807 |  | 29,489
Government National Mortgage Association |  | 15,473 |  | 316 |  | 15 |  | 15,774
Collateralized mortgage obligations: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 16,921 |  | 74 |  | 125 |  | 16,870
Federal Home Loan Mortgage Corporation |  | 5,142 |  | - |  | 65 |  | 5,077
Privately issued |  | - |  | 824 |  | - |  | 824
Total mortgage-backed securities |  | 356,667 |  | 2,225 |  | 5,425 |  | 353,467
Asset-backed securities |  | - |  | 191 |  | - |  | 191
Total available for sale securities | $ | 543,992 | $ | 2,928 | $ | 6,994 | $ | 539,926
Securities held to maturity: |  |  |  |  |  |  |  |
State and political subdivisions |  | 305,248 |  | 2,127 |  | 1,616 |  | 305,759
Mortgage-backed securities: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 10,362 |  | 1 |  | 124 |  | 10,239
Federal Home Loan Mortgage Corporation |  | 3,290 |  | - |  | 150 |  | 3,140
Government National Mortgage Association |  | 24,575 |  | 18 |  | 182 |  | 24,411
Collateralized mortgage obligations: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 83,929 |  | 21 |  | 1,573 |  | 82,377
Federal Home Loan Mortgage Corporation |  | 101,025 |  | 80 |  | 1,827 |  | 99,278
Government National Mortgage Association |  | 14,909 |  | 40 |  | 162 |  | 14,787
Total mortgage-backed securities |  | 238,090 |  | 160 |  | 4,018 |  | 234,232
Total held to maturity securities | $ | 543,338 | $ | 2,287 | $ | 5,634 | $ | 539,991
December 31, 2015 |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |
U.S. Government agencies and government |  |  |  |  |  |  |  |
sponsored enterprises | $ | 260,748 | $ | 1,164 | $ | 1,049 | $ | 260,863
Mortgage-backed securities: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 209,671 |  | 1,092 |  | 2,333 |  | 208,430
Federal Home Loan Mortgage Corporation |  | 24,564 |  | 282 |  | 194 |  | 24,652
Government National Mortgage Association |  | 26,465 |  | 943 |  | 4 |  | 27,404
Collateralized mortgage obligations: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 16,998 |  | 90 |  | 154 |  | 16,934
Federal Home Loan Mortgage Corporation |  | 5,175 |  | 1 |  | 91 |  | 5,085
Privately issued |  | - |  | 809 |  | - |  | 809
Total mortgage-backed securities |  | 282,873 |  | 3,217 |  | 2,776 |  | 283,314
Asset-backed securities |  | - |  | 218 |  | - |  | 218
Total available for sale securities | $ | 543,621 | $ | 4,599 | $ | 3,825 | $ | 544,395
December 31, 2015 (continued) |  |  |  |  |  |  |  |
Securities held to maturity: |  |  |  |  |  |  |  |
State and political subdivisions |  | 294,423 |  | 6,562 |  | 4 |  | 300,981
Mortgage-backed securities: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 9,242 |  | 14 |  | 79 |  | 9,177
Government National Mortgage Association |  | 25,607 |  | 33 |  | 159 |  | 25,481
Collateralized mortgage obligations: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 56,791 |  | - |  | 818 |  | 55,973
Federal Home Loan Mortgage Corporation |  | 80,570 |  | - |  | 1,120 |  | 79,450
Government National Mortgage Association |  | 19,084 |  | 19 |  | 101 |  | 19,002
Total mortgage-backed securities |  | 191,294 |  | 66 |  | 2,277 |  | 189,083
Total held to maturity securities | $ | 485,717 | $ | 6,628 | $ | 2,281 | $ | 490,064
Interest And Dividends On Securities |
|  | 2016 |  | 2015 |  | 2014
Taxable interest and dividends | $ | 17,025 | $ | 16,123 | $ | 13,304
Tax-exempt interest and dividends |  | 5,892 |  | 5,752 |  | 5,298
Total interest and dividends on securities | $ | 22,917 | $ | 21,875 | $ | 18,602
Sales And Calls Of Securities Available For Sale |
|  | 2016 |  | 2015 |  | 2014
Proceeds from sales | $ | 95,261 | $ | 54,277 | $ | 81,600
Gross realized gains |  | 2,695 |  | 2,000 |  | 2,043
Gross realized losses |  | - |  | 12 |  | 2
Scheduled Maturities Of Securities Available For Sale And Securities Held To Maturity |
|  | Amortized |  | Fair
|  | Cost |  | Value
Debt securities available for sale: |  |  |  |
Due in one year or less | $ | 127 | $ | 127
Due from one to five years |  | 149,249 |  | 149,428
Due after five years through ten years |  | 277,147 |  | 274,529
Due after ten years |  | 117,469 |  | 115,842
| $ | 543,992 | $ | 539,926
Debt securities held to maturity: |  |  |  |
Due in one year or less | $ | 48,132 | $ | 48,188
Due from one to five years |  | 176,150 |  | 177,962
Due after five years through ten years |  | 93,849 |  | 92,396
Due after ten years |  | 225,207 |  | 221,445
| $ | 543,338 | $ | 539,991
Investments' Gross Unrealized Losses And Fair Value |
| Less than 12 months | 12 months or longer | Total
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
|  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and government |  |  |  |  |  |  |  |  |  |  |  |
sponsored enterprises | $ | 113,261 | $ | 1,566 | $ | 1,458 | $ | 3 | $ | 114,719 | $ | 1,569
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 211,491 |  | 4,413 |  | - |  | - |  | 211,491 |  | 4,413
Federal Home Loan Mortgage Corporation |  | 24,360 |  | 807 |  | - |  | - |  | 24,360 |  | 807
Government National Mortgage Association |  | 1,111 |  | 15 |  | - |  | - |  | 1,111 |  | 15
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 8,119 |  | 125 |  | - |  | - |  | 8,119 |  | 125
Federal Home Loan Mortgage Corporation |  | 5,077 |  | 65 |  | - |  | - |  | 5,077 |  | 65
Total mortgage-backed securities |  | 250,158 |  | 5,425 |  | - |  | - |  | 250,158 |  | 5,425
Total available for sale securities |  | 363,419 |  | 6,991 |  | 1,458 |  | 3 |  | 364,877 |  | 6,994
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  | 82,644 |  | 1,616 |  | - |  | - |  | 82,644 |  | 1,616
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 9,253 |  | 124 |  | - |  | - |  | 9,253 |  | 124
Federal Home Loan Mortgage Corporation |  | 3,141 |  | 150 |  | - |  | - |  | 3,141 |  | 150
Government National Mortgage Association |  | 10,736 |  | 182 |  | - |  | - |  | 10,736 |  | 182
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 72,734 |  | 1,560 |  | 3,107 |  | 13 |  | 75,841 |  | 1,573
Federal Home Loan Mortgage Corporation |  | 92,256 |  | 1,825 |  | 430 |  | 2 |  | 92,686 |  | 1,827
Government National Mortgage Association |  | 8,675 |  | 161 |  | 531 |  | 1 |  | 9,206 |  | 162
Total mortgage-backed securities |  | 196,795 |  | 4,002 |  | 4,068 |  | 16 |  | 200,863 |  | 4,018
Total held to maturity securities |  | 279,439 |  | 5,618 |  | 4,068 |  | 16 |  | 283,507 |  | 5,634
Total temporarily impaired securities | $ | 642,858 | $ | 12,609 | $ | 5,526 | $ | 19 | $ | 648,384 | $ | 12,628
| Less than 12 months | 12 months or longer | Total
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
|  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and government |  |  |  |  |  |  |  |  |  |  |  |
sponsored enterprises | $ | 82,298 | $ | 735 | $ | 26,302 | $ | 314 | $ | 108,600 | $ | 1,049
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 123,774 |  | 2,134 |  | 9,562 |  | 199 |  | 133,336 |  | 2,333
Federal Home Loan Mortgage Corporation |  | 12,660 |  | 194 |  | - |  | - |  | 12,660 |  | 194
Government National Mortgage Association |  | 1,405 |  | 4 |  | - |  | - |  | 1,405 |  | 4
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 7,778 |  | 154 |  | - |  | - |  | 7,778 |  | 154
Federal Home Loan Mortgage Corporation |  | 4,998 |  | 91 |  | - |  | - |  | 4,998 |  | 91
Total mortgage-backed securities |  | 150,615 |  | 2,577 |  | 9,562 |  | 199 |  | 160,177 |  | 2,776
Total available for sale securities |  | 232,913 |  | 3,312 |  | 35,864 |  | 513 |  | 268,777 |  | 3,825
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  | 3,075 |  | 4 |  | - |  | - |  | 3,075 |  | 4
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 5,666 |  | 79 |  | - |  | - |  | 5,666 |  | 79
Government National Mortgage Association |  | 8,790 |  | 159 |  | - |  | - |  | 8,790 |  | 159
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 55,973 |  | 818 |  | - |  | - |  | 55,973 |  | 818
Federal Home Loan Mortgage Corporation |  | 79,323 |  | 1,120 |  | - |  | - |  | 79,323 |  | 1,120
Government National Mortgage Association |  | 14,559 |  | 101 |  | - |  | - |  | 14,559 |  | 101
Total mortgage-backed securities |  | 164,311 |  | 2,277 |  | - |  | - |  | 164,311 |  | 2,277
Total held to maturity securities |  | 167,386 |  | 2,281 |  | - |  | - |  | 167,386 |  | 2,281
Total temporarily impaired securities | $ | 400,299 | $ | 5,593 | $ | 35,864 | $ | 513 | $ | 436,163 | $ | 6,106

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