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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2016
Investment Securities [Abstract] |
Amortized Cost And Fair Value Of Investment Securities |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
March 31, 2016 |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |
U.S. Government agencies and government |  |  |  |  |  |  |  |
sponsored enterprises | $ | 235,964 | $ | 5,506 | $ | 7 | $ | 241,463
Mortgage-backed securities: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 293,220 |  | 4,312 |  | 53 |  | 297,479
Federal Home Loan Mortgage Corporation |  | 28,019 |  | 535 |  | 28 |  | 28,526
Government National Mortgage Association |  | 18,302 |  | 664 |  | 12 |  | 18,954
Collateralized mortgage obligations: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 16,986 |  | 394 |  | - |  | 17,380
Federal Home Loan Mortgage Corporation |  | 5,165 |  | 90 |  | - |  | 5,255
Privately issued |  | - |  | 777 |  | - |  | 777
Total mortgage-backed securities |  | 361,692 |  | 6,772 |  | 93 |  | 368,371
Asset-backed securities |  | - |  | 179 |  | - |  | 179
Total available for sale securities | $ | 597,656 | $ | 12,457 | $ | 100 | $ | 610,013
Securities held to maturity: |  |  |  |  |  |  |  |
State and political subdivisions |  | 291,934 |  | 8,544 |  | 1 |  | 300,477
Mortgage-backed securities: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 9,190 |  | 152 |  | 2 |  | 9,340
Government National Mortgage Association |  | 26,365 |  | 204 |  | 41 |  | 26,528
Collateralized mortgage obligations: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 54,281 |  | 227 |  | 15 |  | 54,493
Federal Home Loan Mortgage Corporation |  | 77,407 |  | 467 |  | 5 |  | 77,869
Government National Mortgage Association |  | 17,106 |  | 57 |  | 7 |  | 17,156
Total mortgage-backed securities |  | 184,349 |  | 1,107 |  | 70 |  | 185,386
Total held to maturity securities | $ | 476,283 | $ | 9,651 | $ | 71 | $ | 485,863
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
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 | $ | 5,101 | $ | 5,137
Due from one to five years |  | 179,535 |  | 182,050
Due after five years through ten years |  | 300,883 |  | 308,638
Due after ten years |  | 112,137 |  | 114,188
| $ | 597,656 | $ | 610,013
Debt securities held to maturity: |  |  |  |
Due in one year or less | $ | 20,934 | $ | 20,987
Due from one to five years |  | 174,277 |  | 178,726
Due after five years through ten years |  | 111,349 |  | 115,419
Due after ten years |  | 169,723 |  | 170,731
| $ | 476,283 | $ | 485,863
Sales And Calls Of Securities Available For Sale |
|  | Three months ended
|  | March 31,
|  | 2016 |  | 2015
Proceeds from sales | $ | 17,627 | $ | 29,508
Gross realized gains |  | 613 |  | 1,073
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
March 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and government |  |  |  |  |  |  |  |  |  |  |  |
sponsored enterprises | $ | 391 | $ | 1 | $ | 7,482 | $ | 6 | $ | 7,873 | $ | 7
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 12,098 |  | 3 |  | 15,781 |  | 50 |  | 27,879 |  | 53
Federal Home Loan Mortgage Corporation |  | - |  | - |  | 4,258 |  | 28 |  | 4,258 |  | 28
Government National Mortgage Association |  | 1,332 |  | 12 |  | - |  | - |  | 1,332 |  | 12
Total mortgage-backed securities |  | 13,430 |  | 15 |  | 20,039 |  | 78 |  | 33,469 |  | 93
Total available for sale securities |  | 13,821 |  | 16 |  | 27,521 |  | 84 |  | 41,342 |  | 100
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  | 2,477 |  | 1 |  | - |  | - |  | 2,477 |  | 1
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 1,362 |  | 2 |  | - |  | - |  | 1,362 |  | 2
Government National Mortgage Association |  | 4,225 |  | 12 |  | 3,773 |  | 29 |  | 7,998 |  | 41
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 6,895 |  | 15 |  | - |  | - |  | 6,895 |  | 15
Federal Home Loan Mortgage Corporation |  | 5,100 |  | 5 |  | - |  | - |  | 5,100 |  | 5
Government National Mortgage Association |  | 3,366 |  | 7 |  | - |  | - |  | 3,366 |  | 7
Total mortgage-backed securities |  | 20,948 |  | 41 |  | 3,773 |  | 29 |  | 24,721 |  | 70
Total held to maturity securities |  | 23,425 |  | 42 |  | 3,773 |  | 29 |  | 27,198 |  | 71
Total temporarily impaired securities | $ | 37,246 | $ | 58 | $ | 31,294 | $ | 113 | $ | 68,540 | $ | 171
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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