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Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2018
Investments [Abstract] |
Amortized Cost And Fair Value Of Investment Securities |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
June 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency and government sponsored enterprises |  | $ | 162,330 |  |  | $ | 11 |  |  | $ | 4,815 |  |  | $ | 157,526 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  |  | 296,084 |  |  |  | 52 |  |  |  | 9,954 |  |  |  | 286,182 |
Federal Home Loan Mortgage Corporation |  |  | 38,387 |  |  |  | 15 |  |  |  | 1,655 |  |  |  | 36,747 |
Government National Mortgage Association |  |  | 10,595 |  |  |  | 140 |  |  |  | 102 |  |  |  | 10,633 |
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  |  | 163 |  |  |  | — |  |  |  | — |  |  |  | 163 |
Federal Home Loan Mortgage Corporation |  |  | 40 |  |  |  | — |  |  |  | — |  |  |  | 40 |
Privately issued |  |  | — |  |  |  | 937 |  |  |  | — |  |  |  | 937 |
Total mortgage-backed securities |  |  | 345,269 |  |  |  | 1,144 |  |  |  | 11,711 |  |  |  | 334,702 |
Total available for sale securities |  | $ | 507,599 |  |  | $ | 1,155 |  |  | $ | 16,526 |  |  | $ | 492,228 |
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  |  | 250,791 |  |  |  | 1,287 |  |  |  | 1,559 |  |  |  | 250,519 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  |  | 10,574 |  |  |  | — |  |  |  | 340 |  |  |  | 10,234 |
Federal Home Loan Mortgage Corporation |  |  | 4,662 |  |  |  | — |  |  |  | 226 |  |  |  | 4,436 |
Government National Mortgage Association |  |  | 33,934 |  |  |  | 13 |  |  |  | 954 |  |  |  | 32,993 |
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  |  | 68,906 |  |  |  | — |  |  |  | 2,966 |  |  |  | 65,940 |
Federal Home Loan Mortgage Corporation |  |  | 85,824 |  |  |  | — |  |  |  | 3,705 |  |  |  | 82,119 |
Government National Mortgage Association |  |  | 20,112 |  |  |  | — |  |  |  | 811 |  |  |  | 19,301 |
Total mortgage-backed securities |  |  | 224,012 |  |  |  | 13 |  |  |  | 9,002 |  |  |  | 215,023 |
Total held to maturity securities |  | $ | 474,803 |  |  | $ | 1,300 |  |  | $ | 10,561 |  |  | $ | 465,542 |
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 |
(4.)INVESTMENT SECURITIES (Continued)
|  | 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 June 30, |  |  | Six months ended June 30, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Proceeds from sales |  | $ | 5,768 |  |  | $ | 12,957 |  |  | $ | 5,768 |  |  | $ | 25,307 |
Gross realized gains |  |  | 9 |  |  |  | 210 |  |  |  | 9 |  |  |  | 416 |
Gross realized losses |  |  | 2 |  |  |  | — |  |  |  | 2 |  |  |  | — |
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 |  | $ | 26,364 |  |  | $ | 26,197 |
Due from one to five years |  |  | 144,174 |  |  |  | 140,856 |
Due after five years through ten years |  |  | 238,443 |  |  |  | 229,545 |
Due after ten years |  |  | 98,618 |  |  |  | 95,630 |
|  | $ | 507,599 |  |  | $ | 492,228 |
Debt securities held to maturity: |  |  |  |  |  |  |  |
Due in one year or less |  | $ | 55,989 |  |  | $ | 56,177 |
Due from one to five years |  |  | 151,052 |  |  |  | 151,799 |
Due after five years through ten years |  |  | 88,698 |  |  |  | 85,681 |
Due after ten years |  |  | 179,064 |  |  |  | 171,885 |
|  | $ | 474,803 |  |  | $ | 465,542 |
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 |
June 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency and government sponsored enterprises |  | $ | 123,345 |  |  | $ | 3,328 |  |  | $ | 30,701 |  |  |  |  | $ | 1,487 |  |  |  |  | $ | 154,046 |  |  | $ | 4,815 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  |  | 219,797 |  |  |  | 7,637 |  |  |  | 63,598 |  |  |  |  |  | 2,317 |  |  |  |  |  | 283,395 |  |  |  | 9,954 |
Federal Home Loan Mortgage Corporation |  |  | 21,415 |  |  |  | 751 |  |  |  | 14,438 |  |  |  |  |  | 904 |  |  |  |  |  | 35,853 |  |  |  | 1,655 |
Government National Mortgage Association |  |  | 4,410 |  |  |  | 97 |  |  |  | 789 |  |  |  |  |  | 5 |  |  |  |  |  | 5,199 |  |  |  | 102 |
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  |  | — |  |  |  | — |  |  |  | 77 |  |  |  |  |  | — |  |  |  |  |  | 77 |  |  |  | — |
Federal Home Loan Mortgage Corporation |  |  | — |  |  |  | — |  |  |  | 7 |  |  |  |  |  | — |  |  |  |  |  | 7 |  |  |  | — |
Total mortgage-backed securities |  |  | 245,622 |  |  |  | 8,485 |  |  |  | 78,909 |  |  |  |  |  | 3,226 |  |  |  |  |  | 324,531 |  |  |  | 11,711 |
Total available for sale securities |  |  | 368,967 |  |  |  | 11,813 |  |  |  | 109,610 |  |  |  |  |  | 4,713 |  |  |  |  |  | 478,577 |  |  |  | 16,526 |
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  |  | 65,548 |  |  |  | 883 |  |  |  | 15,698 |  |  |  |  |  | 676 |  |  |  |  |  | 81,246 |  |  |  | 1,559 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  |  | 7,662 |  |  |  | 202 |  |  |  | 2,572 |  |  |  |  |  | 138 |  |  |  |  |  | 10,234 |  |  |  | 340 |
Federal Home Loan Mortgage Corporation |  |  | 1,474 |  |  |  | 13 |  |  |  | 2,962 |  |  |  |  |  | 213 |  |  |  |  |  | 4,436 |  |  |  | 226 |
Government National Mortgage Association |  |  | 11,967 |  |  |  | 399 |  |  |  | 13,627 |  |  |  |  |  | 555 |  |  |  |  |  | 25,594 |  |  |  | 954 |
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  |  | 16,268 |  |  |  | 500 |  |  |  | 49,672 |  |  |  |  |  | 2,466 |  |  |  |  |  | 65,940 |  |  |  | 2,966 |
Federal Home Loan Mortgage Corporation |  |  | 20,606 |  |  |  | 799 |  |  |  | 61,513 |  |  |  |  |  | 2,906 |  |  |  |  |  | 82,119 |  |  |  | 3,705 |
Government National Mortgage Association |  |  | 6,940 |  |  |  | 282 |  |  |  | 12,361 |  |  |  |  |  | 529 |  |  |  |  |  | 19,301 |  |  |  | 811 |
Total mortgage-backed securities |  |  | 64,917 |  |  |  | 2,195 |  |  |  | 142,707 |  |  |  |  |  | 6,807 |  |  |  |  |  | 207,624 |  |  |  | 9,002 |
Total held to maturity securities |  |  | 130,465 |  |  |  | 3,078 |  |  |  | 158,405 |  |  |  |  |  | 7,483 |  |  |  |  |  | 288,870 |  |  |  | 10,561 |
Total temporarily impaired securities |  | $ | 499,432 |  |  | $ | 14,891 |  |  | $ | 268,015 |  |  |  |  | $ | 12,196 |  |  |  |  | $ | 767,447 |  |  | $ | 27,087 |
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 |
(4.)INVESTMENT SECURITIES (Continued)
|  | 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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