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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2016
Investment Securities [Abstract] |
Amortized Cost And Fair Value Of Investment Securities |
|  | Amortized |  |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  |  | Gains |  | Losses |  | Value
September 30, 2016 |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and government |  |  |  |  |  |  |  |  |  |  |
sponsored enterprises | $ | 175,134 |  | $ | 5,508 |  | $ | 5 |  | $ | 180,637
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 312,771 |  |  | 7,501 |  |  | - |  |  | 320,272
Federal Home Loan Mortgage Corporation |  | 39,425 |  |  | 773 |  |  | 11 |  |  | 40,187
Government National Mortgage Association |  | 16,332 |  |  | 672 |  |  | 15 |  |  | 16,989
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 328 |  |  | - |  |  | 1 |  |  | 327
Federal Home Loan Mortgage Corporation |  | 73 |  |  | - |  |  | 1 |  |  | 72
Privately issued |  | - |  |  | 816 |  |  | - |  |  | 816
Total mortgage-backed securities |  | 368,929 |  |  | 9,762 |  |  | 28 |  |  | 378,663
Asset-backed securities |  | - |  |  | 195 |  |  | - |  |  | 195
Total available for sale securities | $ | 544,063 |  | $ | 15,465 |  | $ | 33 |  | $ | 559,495
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  | 300,922 |  |  | 8,136 |  |  | 45 |  |  | 309,013
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 10,422 |  |  | 276 |  |  | - |  |  | 10,698
Federal Home Loan Mortgage Corporation |  | 1,351 |  |  | - |  |  | 1 |  |  | 1,350
Government National Mortgage Association |  | 25,402 |  |  | 366 |  |  | 1 |  |  | 25,767
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 75,287 |  |  | 426 |  | 105 |  |  | 75,608
Federal Home Loan Mortgage Corporation |  | 98,439 |  |  | 942 |  |  | 128 |  |  | 99,253
Government National Mortgage Association |  | 16,885 |  |  | 72 |  |  | 16 |  |  | 16,941
Total mortgage-backed securities |  | 227,786 |  |  | 2,082 |  |  | 251 |  |  | 229,617
Total held to maturity securities | $ | 528,708 |  | $ | 10,218 |  | $ | 296 |  | $ | 538,630
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
Sales And Calls Of Securities Available For Sale |
| Three months ended |  | Nine months ended
| September 30, |  | September 30,
|  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015
Proceeds from sales | $ | 23,497 |  | $ | 8,112 |  | $ | 85,772 |  | $ | 37,620
Gross realized gains |  | 426 |  |  | 286 |  |  | 2,426 |  |  | 1,359
Gross realized losses |  | - |  |  | - |  |  | - |  |  | 11
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 | $ | 105 |  | $ | 105
Due from one to five years |  | 153,605 |  |  | 156,094
Due after five years through ten years |  | 268,354 |  |  | 277,631
Due after ten years |  | 121,999 |  |  | 125,665
| $ | 544,063 |  | $ | 559,495
Debt securities held to maturity: |  |  |  |  |
Due in one year or less | $ | 42,584 |  | $ | 42,684
Due from one to five years |  | 178,401 |  |  | 183,536
Due after five years through ten years |  | 92,745 |  |  | 95,657
Due after ten years |  | 214,978 |  |  | 216,753
| $ | 528,708 |  | $ | 538,630
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, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies and government |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
sponsored enterprises | $ | - |  | $ | - |  | $ | 1,515 |  | $ | 5 |  | $ | 1,515 |  | $ | 5
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal Home Loan Mortgage Corporation |  | 4,992 |  |  | 11 |  |  | - |  |  | - |  |  | 4,992 |  |  | 11
Government National Mortgage Association |  | 1,171 |  |  | 15 |  |  | - |  |  | - |  |  | 1,171 |  |  | 15
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 326 |  |  | 1 |  |  | - |  |  | - |  |  | 326 |  |  | 1
Federal Home Loan Mortgage Corporation |  | 73 |  |  | 1 |  |  | - |  |  | - |  |  | 73 |  |  | 1
Total mortgage-backed securities |  | 6,562 |  |  | 28 |  |  | - |  |  | - |  |  | 6,562 |  |  | 28
Total available for sale securities |  | 6,562 |  |  | 28 |  |  | 1,515 |  |  | 5 |  |  | 8,077 |  |  | 33
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  | 12,710 |  |  | 45 |  |  | - |  |  | - |  |  | 12,710 |  |  | 45
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal Home Loan Mortgage Corporation |  | 1,349 |  |  | 1 |  |  | - |  |  | - |  |  | 1,349 |  |  | 1
Government National Mortgage Association |  | 1,630 |  |  | 1 |  |  | - |  |  | - |  |  | 1,630 |  |  | 1
Collateralized mortgage obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal National Mortgage Association |  | 26,315 |  |  | 89 |  |  | 3,600 |  |  | 16 |  |  | 29,915 |  |  | 105
Federal Home Loan Mortgage Corporation |  | 27,838 |  |  | 127 |  |  | 496 |  |  | 1 |  |  | 28,334 |  |  | 128
Government National Mortgage Association |  | 6,677 |  |  | 14 |  |  | 1,510 |  |  | 2 |  |  | 8,187 |  |  | 16
Total mortgage-backed securities |  | 63,809 |  |  | 232 |  |  | 5,606 |  |  | 19 |  |  | 69,415 |  |  | 251
Total held to maturity securities |  | 76,519 |  |  | 277 |  |  | 5,606 |  |  | 19 |  |  | 82,125 |  |  | 296
Total temporarily impaired securities | $ | 83,081 |  | $ | 305 |  | $ | 7,121 |  | $ | 24 |  | $ | 90,202 |  | $ | 329
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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