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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2014
Investment Securities [Abstract] |
Amortized Cost And Fair Value Of Investment Securities |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
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 collateralized mortgage obligations |  | 195,824 |  | 2,504 |  | 3,569 |  | 194,759
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 held to maturity securities | $ | 294,438 | $ | 4,377 | $ | 120 | $ | 298,695
December 31, 2013 |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |
U.S. Government agencies and government |  |  |  |  |  |  |  |
sponsored enterprises | $ | 135,840 | $ | 1,414 | $ | 2,802 | $ | 134,452
Mortgage-backed securities: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 173,507 |  | 1,511 |  | 4,810 |  | 170,208
Federal Home Loan Mortgage Corporation |  | 36,737 |  | 562 |  | 205 |  | 37,094
Government National Mortgage Association |  | 61,832 |  | 2,152 |  | 142 |  | 63,842
Collateralized mortgage obligations: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 63,838 |  | 261 |  | 3,195 |  | 60,904
Federal Home Loan Mortgage Corporation |  | 102,660 |  | 169 |  | 5,856 |  | 96,973
Government National Mortgage Association |  | 43,734 |  | 913 |  | 586 |  | 44,061
Privately issued |  | - |  | 1,467 |  | - |  | 1,467
Total collateralized mortgage obligations |  | 210,232 |  | 2,810 |  | 9,637 |  | 203,405
Total mortgage-backed securities |  | 482,308 |  | 7,035 |  | 14,794 |  | 474,549
Asset-backed securities |  | 18 |  | 381 |  | - |  | 399
Total available for sale securities | $ | 618,166 | $ | 8,830 | $ | 17,596 | $ | 609,400
Securities held to maturity: |  |  |  |  |  |  |  |
State and political subdivisions | $ | 249,785 | $ | 1,340 | $ | 468 | $ | 250,657
Interest And Dividends On Securities |
|  | 2014 |  | 2013 |  | 2012
Taxable interest and dividends | $ | 13,304 | $ | 12,541 | $ | 12,202
Tax-exempt interest and dividends |  | 5,298 |  | 4,922 |  | 4,242
Total interest and dividends on securities | $ | 18,602 | $ | 17,463 | $ | 16,444
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 | $ | 22,102 | $ | 22,104
Due from one to five years |  | 136,917 |  | 136,720
Due after five years through ten years |  | 214,050 |  | 217,119
Due after ten years |  | 246,224 |  | 246,551
| $ | 619,293 | $ | 622,494
Debt securities held to maturity: |  |  |  |
Due in one year or less | $ | 23,659 | $ | 23,734
Due from one to five years |  | 136,752 |  | 138,499
Due after five years through ten years |  | 116,862 |  | 119,151
Due after ten years |  | 17,165 |  | 17,311
| $ | 294,438 | $ | 298,695
Sales And Calls Of Securities Available For Sale |
|  | 2014 |  | 2013 |  | 2012
Proceeds from sales | $ | 81,600 | $ | 1,327 | $ | 2,823
Gross realized gains |  | 2,043 |  | 1,226 |  | 2,651
Gross realized losses |  | 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, 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 collateralized mortgage obligations |  | 11,228 |  | 24 |  | 104,280 |  | 3,545 |  | 115,508 |  | 3,569
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
December 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and government |  |  |  |  |  |  |  |  |  |  |  |
sponsored enterprises | $ | 86,177 | $ | 2,788 | $ | 2,717 | $ | 14 | $ | 88,894 | $ | 2,802
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 103,778 |  | 3,491 |  | 20,689 |  | 1,319 |  | 124,467 |  | 4,810
Federal Home Loan Mortgage Corporation |  | 14,166 |  | 205 |  | - |  | - |  | 14,166 |  | 205
Government National Mortgage Association |  | 14,226 |  | 142 |  | - |  | - |  | 14,226 |  | 142
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 35,632 |  | 2,586 |  | 11,760 |  | 609 |  | 47,392 |  | 3,195
Federal Home Loan Mortgage Corporation |  | 72,655 |  | 4,980 |  | 15,762 |  | 876 |  | 88,417 |  | 5,856
Government National Mortgage Association |  | 8,396 |  | 586 |  | - |  | - |  | 8,396 |  | 586
Total collateralized mortgage obligations |  | 116,683 |  | 8,152 |  | 27,522 |  | 1,485 |  | 144,205 |  | 9,637
Total mortgage-backed securities |  | 248,853 |  | 11,990 |  | 48,211 |  | 2,804 |  | 297,064 |  | 14,794
Total available for sale securities |  | 335,030 |  | 14,778 |  | 50,928 |  | 2,818 |  | 385,958 |  | 17,596
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  | 72,269 |  | 468 |  | - |  | - |  | 72,269 |  | 468
Total temporarily impaired securities | $ | 407,299 | $ | 15,246 | $ | 50,928 | $ | 2,818 | $ | 458,227 | $ | 18,064

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