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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2018
Investment Securities [Abstract] |
Amortized Cost And Fair Value Of Investment Securities |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
March 31, 2018 |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |
U.S. Government agency and government |  |  |  |  |  |  |  |
sponsored enterprises | $ | 162,610 | $ | 18 | $ | 3,812 | $ | 158,816
Mortgage-backed securities: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 307,972 |  | 83 |  | 7,922 |  | 300,133
Federal Home Loan Mortgage Corporation |  | 40,078 |  | 34 |  | 1,361 |  | 38,751
Government National Mortgage Association |  | 11,258 |  | 131 |  | 72 |  | 11,317
Collateralized mortgage obligations: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 186 |  | - |  | - |  | 186
Federal Home Loan Mortgage Corporation |  | 43 |  | - |  | - |  | 43
Privately issued |  | - |  | 951 |  | - |  | 951
Total mortgage-backed securities |  | 359,537 |  | 1,199 |  | 9,355 |  | 351,381
Total available for sale securities | $ | 522,147 | $ | 1,217 | $ | 13,167 | $ | 510,197
Securities held to maturity: |  |  |  |  |  |  |  |
State and political subdivisions |  | 279,085 |  | 1,303 |  | 1,721 |  | 278,667
Mortgage-backed securities: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 9,503 |  | - |  | 289 |  | 9,214
Federal Home Loan Mortgage Corporation |  | 3,193 |  | - |  | 193 |  | 3,000
Government National Mortgage Association |  | 26,271 |  | - |  | 840 |  | 25,431
Collateralized mortgage obligations: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 72,584 |  | - |  | 2,649 |  | 69,935
Federal Home Loan Mortgage Corporation |  | 89,871 |  | - |  | 3,297 |  | 86,574
Government National Mortgage Association |  | 21,398 |  | - |  | 718 |  | 20,680
Total mortgage-backed securities |  | 222,820 |  | - |  | 7,986 |  | 214,834
Total held to maturity securities | $ | 501,905 | $ | 1,303 | $ | 9,707 | $ | 493,501
December 31, 2017 |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |
U.S. Government agency and government |  |  |  |  |  |  |  |
sponsored enterprises | $ | 163,025 | $ | 122 | $ | 1,258 | $ | 161,889
Mortgage-backed securities: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 311,830 |  | 313 |  | 3,220 |  | 308,923
Federal Home Loan Mortgage Corporation |  | 41,290 |  | 76 |  | 675 |  | 40,691
Government National Mortgage Association |  | 12,051 |  | 193 |  | 12 |  | 12,232
Collateralized mortgage obligations: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 217 |  | 1 |  | 1 |  | 217
Federal Home Loan Mortgage Corporation |  | 45 |  | - |  | - |  | 45
Privately issued |  | - |  | 976 |  | - |  | 976
Total mortgage-backed securities |  | 365,433 |  | 1,559 |  | 3,908 |  | 363,084
Total available for sale securities | $ | 528,458 | $ | 1,681 | $ | 5,166 | $ | 524,973
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
December 31, 2017 (continued) |  |  |  |  |  |  |  |
Securities held to maturity: |  |  |  |  |  |  |  |
State and political subdivisions |  | 283,557 |  | 2,317 |  | 662 |  | 285,212
Mortgage-backed securities: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 9,732 |  | 16 |  | 88 |  | 9,660
Federal Home Loan Mortgage Corporation |  | 3,213 |  | - |  | 119 |  | 3,094
Government National Mortgage Association |  | 26,841 |  | - |  | 330 |  | 26,511
Collateralized mortgage obligations: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 76,432 |  | - |  | 1,958 |  | 74,474
Federal Home Loan Mortgage Corporation |  | 93,810 |  | 3 |  | 2,165 |  | 91,648
Government National Mortgage Association |  | 22,881 |  | 5 |  | 502 |  | 22,384
Total mortgage-backed securities |  | 232,909 |  | 24 |  | 5,162 |  | 227,771
Total held to maturity securities | $ | 516,466 | $ | 2,341 | $ | 5,824 | $ | 512,983
Sales And Calls Of Securities Available For Sale |
| Three months ended
| March 31,
|  | 2018 |  | 2017
Proceeds from sales | $ | - | $ | 12,350
Gross realized gains |  | - |  | 206
Gross realized losses |  | - |  | -
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 | $ | 4,996 | $ | 4,969
Due from one to five years |  | 151,747 |  | 149,200
Due after five years through ten years |  | 258,466 |  | 251,415
Due after ten years |  | 106,938 |  | 104,613
| $ | 522,147 | $ | 510,197
Debt securities held to maturity: |  |  |  |
Due in one year or less | $ | 55,255 | $ | 55,295
Due from one to five years |  | 161,111 |  | 162,153
Due after five years through ten years |  | 103,311 |  | 100,349
Due after ten years |  | 182,228 |  | 175,704
| $ | 501,905 | $ | 493,501
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, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency and government |  |  |  |  |  |  |  |  |  |  |  |
sponsored enterprises | $ | 124,166 | $ | 2,539 | $ | 30,944 | $ | 1,273 | $ | 155,110 | $ | 3,812
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 226,028 |  | 5,855 |  | 65,749 |  | 2,067 |  | 291,777 |  | 7,922
Federal Home Loan Mortgage Corporation |  | 22,258 |  | 597 |  | 14,941 |  | 764 |  | 37,199 |  | 1,361
Government National Mortgage Association |  | 4,688 |  | 66 |  | 837 |  | 6 |  | 5,525 |  | 72
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | - |  | - |  | 95 |  | - |  | 95 |  | -
Federal Home Loan Mortgage Corporation |  | - |  | - |  | 7 |  | - |  | 7 |  | -
Total mortgage-backed securities |  | 252,974 |  | 6,518 |  | 81,629 |  | 2,837 |  | 334,603 |  | 9,355
Total available for sale securities |  | 377,140 |  | 9,057 |  | 112,573 |  | 4,110 |  | 489,713 |  | 13,167
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  | 86,593 |  | 1,062 |  | 14,294 |  | 659 |  | 100,887 |  | 1,721
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 6,604 |  | 164 |  | 2,610 |  | 125 |  | 9,214 |  | 289
Federal Home Loan Mortgage Corporation |  | - |  | - |  | 3,000 |  | 193 |  | 3,000 |  | 193
Government National Mortgage Association |  | 15,403 |  | 424 |  | 10,028 |  | 416 |  | 25,431 |  | 840
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 18,080 |  | 426 |  | 51,855 |  | 2,223 |  | 69,935 |  | 2,649
Federal Home Loan Mortgage Corporation |  | 21,491 |  | 664 |  | 65,083 |  | 2,633 |  | 86,574 |  | 3,297
Government National Mortgage Association |  | 11,448 |  | 387 |  | 9,232 |  | 331 |  | 20,680 |  | 718
Total mortgage-backed securities |  | 73,026 |  | 2,065 |  | 141,808 |  | 5,921 |  | 214,834 |  | 7,986
Total held to maturity securities |  | 159,619 |  | 3,127 |  | 156,102 |  | 6,580 |  | 315,721 |  | 9,707
Total temporarily impaired securities | $ | 536,759 | $ | 12,184 | $ | 268,675 | $ | 10,690 | $ | 805,434 | $ | 22,874
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and government |  |  |  |  |  |  |  |  |  |  |  |
sponsored enterprises | $ | 95,046 | $ | 571 | $ | 31,561 | $ | 687 | $ | 126,607 | $ | 1,258
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 201,754 |  | 1,855 |  | 67,383 |  | 1,365 |  | 269,137 |  | 3,220
Federal Home Loan Mortgage Corporation |  | 20,446 |  | 192 |  | 15,601 |  | 483 |  | 36,047 |  | 675
Government National Mortgage Association |  | 2,432 |  | - |  | 880 |  | 12 |  | 3,312 |  | 12
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | - |  | - |  | 119 |  | 1 |  | 119 |  | 1
Federal Home Loan Mortgage Corporation |  | - |  | - |  | 8 |  | - |  | 8 |  | -
Total mortgage-backed securities |  | 224,632 |  | 2,047 |  | 83,991 |  | 1,861 |  | 308,623 |  | 3,908
Total available for sale securities |  | 319,678 |  | 2,618 |  | 115,552 |  | 2,548 |  | 435,230 |  | 5,166
|  | Less than 12 months |  | 12 months or longer |  | Total
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
|  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
December 31, 2017 (continued) |  |  |  |  |  |  |  |  |  |  |  |
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  | 36,368 |  | 295 |  | 14,492 |  | 367 |  | 50,860 |  | 662
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 3,766 |  | 29 |  | 2,694 |  | 59 |  | 6,460 |  | 88
Federal Home Loan Mortgage Corporation |  | - |  | - |  | 3,094 |  | 119 |  | 3,094 |  | 119
Government National Mortgage Association |  | 17,327 |  | 136 |  | 9,184 |  | 194 |  | 26,511 |  | 330
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 16,830 |  | 202 |  | 57,645 |  | 1,756 |  | 74,475 |  | 1,958
Federal Home Loan Mortgage Corporation |  | 23,727 |  | 337 |  | 66,467 |  | 1,828 |  | 90,194 |  | 2,165
Government National Mortgage Association |  | 15,401 |  | 340 |  | 5,635 |  | 162 |  | 21,036 |  | 502
Total mortgage-backed securities |  | 77,051 |  | 1,044 |  | 144,719 |  | 4,118 |  | 221,770 |  | 5,162
Total held to maturity securities |  | 113,419 |  | 1,339 |  | 159,211 |  | 4,485 |  | 272,630 |  | 5,824
Total temporarily impaired securities | $ | 433,097 | $ | 3,957 | $ | 274,763 | $ | 7,033 | $ | 707,860 | $ | 10,990

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