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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2017
Investment Securities [Abstract] |
Amortized Cost And Fair Value Of Investment Securities |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
March 31, 2017 |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |
U.S. Government agency and government |  |  |  |  |  |  |  |
sponsored enterprises | $ | 190,793 | $ | 595 | $ | 1,173 | $ | 190,215
Mortgage-backed securities: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 303,388 |  | 842 |  | 4,008 |  | 300,222
Federal Home Loan Mortgage Corporation |  | 34,362 |  | 106 |  | 808 |  | 33,660
Government National Mortgage Association |  | 14,598 |  | 313 |  | 18 |  | 14,893
Collateralized mortgage obligations: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 308 |  | - |  | 2 |  | 306
Federal Home Loan Mortgage Corporation |  | 59 |  | - |  | 1 |  | 58
Privately issued |  | - |  | 819 |  | - |  | 819
Total mortgage-backed securities |  | 352,715 |  | 2,080 |  | 4,837 |  | 349,958
Asset-backed securities |  | - |  | 233 |  | - |  | 233
Total available for sale securities | $ | 543,508 | $ | 2,908 | $ | 6,010 | $ | 540,406
Securities held to maturity: |  |  |  |  |  |  |  |
State and political subdivisions |  | 307,894 |  | 3,723 |  | 892 |  | 310,725
Mortgage-backed securities: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 10,290 |  | - |  | 121 |  | 10,169
Federal Home Loan Mortgage Corporation |  | 3,270 |  | - |  | 154 |  | 3,116
Government National Mortgage Association |  | 27,151 |  | - |  | 256 |  | 26,895
Collateralized mortgage obligations: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 85,474 |  | 21 |  | 1,433 |  | 84,062
Federal Home Loan Mortgage Corporation |  | 98,029 |  | 75 |  | 1,791 |  | 96,313
Government National Mortgage Association |  | 13,273 |  | 34 |  | 149 |  | 13,158
Total mortgage-backed securities |  | 237,487 |  | 130 |  | 3,904 |  | 233,713
Total held to maturity securities | $ | 545,381 | $ | 3,853 | $ | 4,796 | $ | 544,438
December 31, 2016 |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |
U.S. Government agency and government |  |  |  |  |  |  |  |
sponsored enterprises | $ | 187,325 | $ | 512 | $ | 1,569 | $ | 186,268
Mortgage-backed securities: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 288,949 |  | 897 |  | 4,413 |  | 285,433
Federal Home Loan Mortgage Corporation |  | 30,182 |  | 114 |  | 807 |  | 29,489
Government National Mortgage Association |  | 15,473 |  | 316 |  | 15 |  | 15,774
Collateralized mortgage obligations: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 16,921 |  | 74 |  | 125 |  | 16,870
Federal Home Loan Mortgage Corporation |  | 5,142 |  | - |  | 65 |  | 5,077
Privately issued |  | - |  | 824 |  | - |  | 824
Total mortgage-backed securities |  | 356,667 |  | 2,225 |  | 5,425 |  | 353,467
Asset-backed securities |  | - |  | 191 |  | - |  | 191
Total available for sale securities | $ | 543,992 | $ | 2,928 | $ | 6,994 | $ | 539,926
Securities held to maturity: |  |  |  |  |  |  |  |
State and political subdivisions |  | 305,248 |  | 2,127 |  | 1,616 |  | 305,759
Mortgage-backed securities: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 10,362 |  | 1 |  | 124 |  | 10,239
Federal Home Loan Mortgage Corporation |  | 3,290 |  | - |  | 150 |  | 3,140
Government National Mortgage Association |  | 24,575 |  | 18 |  | 182 |  | 24,411
Collateralized mortgage obligations: |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 83,929 |  | 21 |  | 1,573 |  | 82,377
Federal Home Loan Mortgage Corporation |  | 101,025 |  | 80 |  | 1,827 |  | 99,278
Government National Mortgage Association |  | 14,909 |  | 40 |  | 162 |  | 14,787
Total mortgage-backed securities |  | 238,090 |  | 160 |  | 4,018 |  | 234,232
Total held to maturity securities | $ | 543,338 | $ | 2,287 | $ | 5,634 | $ | 539,991
Sales And Calls Of Securities Available For Sale |
|  | Three months ended
|  | March 31,
|  | 2017 |  | 2016
Proceeds from sales | $ | 12,350 | $ | 17,627
Gross realized gains |  | 206 |  | 613
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 | $ | 27 | $ | 27
Due from one to five years |  | 145,749 |  | 145,749
Due after five years through ten years |  | 302,203 |  | 300,102
Due after ten years |  | 95,529 |  | 94,528
| $ | 543,508 | $ | 540,406
Debt securities held to maturity: |  |  |  |
Due in one year or less | $ | 51,256 | $ | 51,326
Due from one to five years |  | 176,638 |  | 179,806
Due after five years through ten years |  | 91,549 |  | 91,059
Due after ten years |  | 225,938 |  | 222,247
| $ | 545,381 | $ | 544,438
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, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency and government |  |  |  |  |  |  |  |  |  |  |  |
sponsored enterprises | $ | 96,026 | $ | 1,171 | $ | 1,412 | $ | 2 | $ | 97,438 | $ | 1,173
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 220,754 |  | 4,008 |  | - |  | - |  | 220,754 |  | 4,008
Federal Home Loan Mortgage Corporation |  | 28,799 |  | 808 |  | - |  | - |  | 28,799 |  | 808
Government National Mortgage Association |  | - |  | - |  | 1,053 |  | 18 |  | 1,053 |  | 18
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 252 |  | 1 |  | 55 |  | 1 |  | 307 |  | 2
Federal Home Loan Mortgage Corporation |  | 59 |  | 1 |  | - |  | - |  | 59 |  | 1
Total mortgage-backed securities |  | 249,864 |  | 4,818 |  | 1,108 |  | 19 |  | 250,972 |  | 4,837
Total available for sale securities |  | 345,890 |  | 5,989 |  | 2,520 |  | 21 |  | 348,410 |  | 6,010
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  | 47,118 |  | 892 |  | - |  | - |  | 47,118 |  | 892
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 10,169 |  | 121 |  | - |  | - |  | 10,169 |  | 121
Federal Home Loan Mortgage Corporation |  | 3,116 |  | 154 |  | - |  | - |  | 3,116 |  | 154
Government National Mortgage Association |  | 24,982 |  | 256 |  | - |  | - |  | 24,982 |  | 256
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 67,013 |  | 1,420 |  | 2,700 |  | 13 |  | 69,713 |  | 1,433
Federal Home Loan Mortgage Corporation |  | 87,601 |  | 1,789 |  | 672 |  | 2 |  | 88,273 |  | 1,791
Government National Mortgage Association |  | 8,042 |  | 148 |  | 305 |  | 1 |  | 8,347 |  | 149
Total mortgage-backed securities |  | 200,923 |  | 3,888 |  | 3,677 |  | 16 |  | 204,600 |  | 3,904
Total held to maturity securities |  | 248,041 |  | 4,780 |  | 3,677 |  | 16 |  | 251,718 |  | 4,796
Total temporarily impaired securities | $ | 593,931 | $ | 10,769 | $ | 6,197 | $ | 37 | $ | 600,128 | $ | 10,806
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and government |  |  |  |  |  |  |  |  |  |  |  |
sponsored enterprises | $ | 113,261 | $ | 1,566 | $ | 1,458 | $ | 3 | $ | 114,719 | $ | 1,569
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 211,491 |  | 4,413 |  | - |  | - |  | 211,491 |  | 4,413
Federal Home Loan Mortgage Corporation |  | 24,360 |  | 807 |  | - |  | - |  | 24,360 |  | 807
Government National Mortgage Association |  | 1,111 |  | 15 |  | - |  | - |  | 1,111 |  | 15
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 8,119 |  | 125 |  | - |  | - |  | 8,119 |  | 125
Federal Home Loan Mortgage Corporation |  | 5,077 |  | 65 |  | - |  | - |  | 5,077 |  | 65
Total mortgage-backed securities |  | 250,158 |  | 5,425 |  | - |  | - |  | 250,158 |  | 5,425
Total available for sale securities |  | 363,419 |  | 6,991 |  | 1,458 |  | 3 |  | 364,877 |  | 6,994
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  | 82,644 |  | 1,616 |  | - |  | - |  | 82,644 |  | 1,616
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 9,253 |  | 124 |  | - |  | - |  | 9,253 |  | 124
Federal Home Loan Mortgage Corporation |  | 3,141 |  | 150 |  | - |  | - |  | 3,141 |  | 150
Government National Mortgage Association |  | 10,736 |  | 182 |  | - |  | - |  | 10,736 |  | 182
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 72,734 |  | 1,560 |  | 3,107 |  | 13 |  | 75,841 |  | 1,573
Federal Home Loan Mortgage Corporation |  | 92,256 |  | 1,825 |  | 430 |  | 2 |  | 92,686 |  | 1,827
Government National Mortgage Association |  | 8,675 |  | 161 |  | 531 |  | 1 |  | 9,206 |  | 162
Total mortgage-backed securities |  | 196,795 |  | 4,002 |  | 4,068 |  | 16 |  | 200,863 |  | 4,018
Total held to maturity securities |  | 279,439 |  | 5,618 |  | 4,068 |  | 16 |  | 283,507 |  | 5,634
Total temporarily impaired securities | $ | 642,858 | $ | 12,609 | $ | 5,526 | $ | 19 | $ | 648,384 | $ | 12,628

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