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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2015
Investment Securities [Abstract] |
Amortized Cost And Fair Value Of Investment Securities |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
September 30, 2015 |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |
U.S. Government agencies and government |  |  |  |  |  |  |  |
sponsored enterprises | $ | 261,364 | $ | 2,539 | $ | 351 | $ | 263,552
Mortgage-backed securities: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 220,626 |  | 3,482 |  | 468 |  | 223,640
Federal Home Loan Mortgage Corporation |  | 27,371 |  | 582 |  | 73 |  | 27,880
Government National Mortgage Association |  | 33,533 |  | 1,399 |  | 3 |  | 34,929
Collateralized mortgage obligations: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 20,798 |  | 408 |  | 5 |  | 21,201
Federal Home Loan Mortgage Corporation |  | 5,181 |  | 1 |  | 6 |  | 5,176
Privately issued |  | - |  | 920 |  | - |  | 920
Total mortgage-backed securities |  | 307,509 |  | 6,792 |  | 555 |  | 313,746
Asset-backed securities |  | - |  | 211 |  | - |  | 211
Total available for sale securities | $ | 568,873 | $ | 9,542 | $ | 906 | $ | 577,509
Securities held to maturity: |  |  |  |  |  |  |  |
State and political subdivisions |  | 289,986 |  | 6,110 |  | 70 |  | 296,026
Mortgage-backed securities: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 9,293 |  | 81 |  | 11 |  | 9,363
Government National Mortgage Association |  | 26,121 |  | 112 |  | 109 |  | 26,124
Collateralized mortgage obligations: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 59,490 |  | - |  | - |  | 59,490
Federal Home Loan Mortgage Corporation |  | 84,350 |  | - |  | - |  | 84,350
Government National Mortgage Association |  | 21,398 |  | - |  | - |  | 21,398
Total mortgage-backed securities |  | 200,652 |  | 193 |  | 120 |  | 200,725
Total held to maturity securities | $ | 490,638 | $ | 6,303 | $ | 190 | $ | 496,751
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
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 | $ | 25,099 | $ | 25,201
Due from one to five years |  | 172,819 |  | 174,865
Due after five years through ten years |  | 296,229 |  | 300,942
Due after ten years |  | 74,726 |  | 76,501
| $ | 568,873 | $ | 577,509
Debt securities held to maturity: |  |  |  |
Due in one year or less | $ | 21,222 | $ | 21,325
Due from one to five years |  | 167,246 |  | 170,997
Due after five years through ten years |  | 119,314 |  | 121,512
Due after ten years |  | 182,856 |  | 182,917
| $ | 490,638 | $ | 496,751
Sales And Calls Of Securities Available For Sale |
|  | Three months ended |  | Nine months ended
|  | September 30, |  | September 30,
|  | 2015 |  | 2014 |  | 2015 |  | 2014
Proceeds from sales | $ | 8,112 | $ | 14,672 | $ | 37,620 | $ | 76,100
Gross realized gains |  | 286 |  | 515 |  | 1,359 |  | 1,777
Gross realized losses |  | - |  | - |  | 11 |  | -
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
September 30, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and government |  |  |  |  |  |  |  |  |  |  |  |
sponsored enterprises | $ | 52,180 | $ | 268 | $ | 26,640 | $ | 83 | $ | 78,820 | $ | 351
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 36,563 |  | 428 |  | 9,768 |  | 40 |  | 46,331 |  | 468
Federal Home Loan Mortgage Corporation |  | 5,967 |  | 73 |  | - |  | - |  | 5,967 |  | 73
Government National Mortgage Association |  | 1,525 |  | 3 |  | - |  | - |  | 1,525 |  | 3
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 2,542 |  | 5 |  | - |  | - |  | 2,542 |  | 5
Federal Home Loan Mortgage Corporation |  | 5,086 |  | 6 |  | - |  | - |  | 5,086 |  | 6
Total mortgage-backed securities |  | 51,683 |  | 515 |  | 9,768 |  | 40 |  | 61,451 |  | 555
Total available for sale securities |  | 103,863 |  | 783 |  | 36,408 |  | 123 |  | 140,271 |  | 906
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  | 11,985 |  | 70 |  | - |  | - |  | 11,985 |  | 70
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 1,369 |  | 11 |  | - |  | - |  | 1,369 |  | 11
Government National Mortgage Association |  | 8,888 |  | 109 |  | - |  | - |  | 8,888 |  | 109
Total mortgage-backed securities |  | 10,257 |  | 120 |  | - |  | - |  | 10,257 |  | 120
Total held to maturity securities |  | 22,242 |  | 190 |  | - |  | - |  | 22,242 |  | 190
Total temporarily impaired securities | $ | 126,105 | $ | 973 | $ | 36,408 | $ | 123 | $ | 162,513 | $ | 1,096
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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