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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2015
Investment Securities [Abstract] |
Amortized Cost And Fair Value Of Investment Securities |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
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
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
December 31, 2014 |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |
U.S. Government agencies and government |  |  |  |  |  |  |  |
sponsored enterprises | $ | 160,334 | $ | 1,116 | $ | 975 | $ | 160,475
Mortgage-backed securities: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 184,857 |  | 2,344 |  | 1,264 |  | 185,937
Federal Home Loan Mortgage Corporation |  | 29,478 |  | 799 |  | 7 |  | 30,270
Government National Mortgage Association |  | 48,800 |  | 2,022 |  | - |  | 50,822
Collateralized mortgage obligations: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 76,247 |  | 489 |  | 944 |  | 75,792
Federal Home Loan Mortgage Corporation |  | 89,623 |  | 199 |  | 2,585 |  | 87,237
Government National Mortgage Association |  | 29,954 |  | 598 |  | 40 |  | 30,512
Privately issued |  | - |  | 1,218 |  | - |  | 1,218
Total mortgage-backed securities |  | 458,959 |  | 7,669 |  | 4,840 |  | 461,788
Asset-backed securities |  | - |  | 231 |  | - |  | 231
Total available for sale securities | $ | 619,293 | $ | 9,016 | $ | 5,815 | $ | 622,494
Securities held to maturity: |  |  |  |  |  |  |  |
State and political subdivisions |  | 277,273 |  | 4,231 |  | 120 |  | 281,384
Mortgage-backed securities: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 3,279 |  | 24 |  | - |  | 3,303
Government National Mortgage Association |  | 13,886 |  | 122 |  | - |  | 14,008
Total mortgage-backed securities |  | 17,165 |  | 146 |  | - |  | 17,311
Total held to maturity securities | $ | 294,438 | $ | 4,377 | $ | 120 | $ | 298,695
Interest And Dividends On Securities |
|  | 2015 |  | 2014 |  | 2013
Taxable interest and dividends | $ | 16,123 | $ | 13,304 | $ | 12,541
Tax-exempt interest and dividends |  | 5,752 |  | 5,298 |  | 4,922
Total interest and dividends on securities | $ | 21,875 | $ | 18,602 | $ | 17,463
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 | $ | 25,182 | $ | 25,241
Due from one to five years |  | 174,053 |  | 173,336
Due after five years through ten years |  | 275,972 |  | 276,660
Due after ten years |  | 68,414 |  | 69,158
| $ | 543,621 | $ | 544,395
Debt securities held to maturity: |  |  |  |
Due in one year or less | $ | 22,188 | $ | 22,261
Due from one to five years |  | 172,094 |  | 175,650
Due after five years through ten years |  | 116,362 |  | 119,183
Due after ten years |  | 175,073 |  | 172,970
| $ | 485,717 | $ | 490,064
Sales And Calls Of Securities Available For Sale |
|  | 2015 |  | 2014 |  | 2013
Proceeds from sales | $ | 54,277 | $ | 81,600 | $ | 1,327
Gross realized gains |  | 2,000 |  | 2,043 |  | 1,226
Gross realized losses |  | 12 |  | 2 |  | -
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, 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
December 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and government |  |  |  |  |  |  |  |  |  |  |  |
sponsored enterprises | $ | 34,995 | $ | 77 | $ | 41,070 | $ | 898 | $ | 76,065 | $ | 975
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 2,242 |  | 8 |  | 62,592 |  | 1,256 |  | 64,834 |  | 1,264
Federal Home Loan Mortgage Corporation |  | 3,387 |  | 7 |  | - |  | - |  | 3,387 |  | 7
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 11,228 |  | 24 |  | 25,644 |  | 920 |  | 36,872 |  | 944
Federal Home Loan Mortgage Corporation |  | - |  | - |  | 76,126 |  | 2,585 |  | 76,126 |  | 2,585
Government National Mortgage Association |  | - |  | - |  | 2,510 |  | 40 |  | 2,510 |  | 40
Total mortgage-backed securities |  | 16,857 |  | 39 |  | 166,872 |  | 4,801 |  | 183,729 |  | 4,840
Total available for sale securities |  | 51,852 |  | 116 |  | 207,942 |  | 5,699 |  | 259,794 |  | 5,815
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  | 18,036 |  | 120 |  | - |  | - |  | 18,036 |  | 120
Total temporarily impaired securities | $ | 69,888 | $ | 236 | $ | 207,942 | $ | 5,699 | $ | 277,830 | $ | 5,935

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