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2. Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Investment securities available for sale |
(Dollars in thousands) |  |  |  |  |  |  |  |  |  |  |
|  | March 31, 2017
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value
Mortgage-backed securities |  | $ | 62,488 |  |  |  | 1,157 |  |  |  | 321 |  |  |  | 63,324
U.S. Government |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
sponsored enterprises |  |  | 39,888 |  |  |  | 273 |  |  |  | 262 |  |  |  | 39,899
State and political subdivisions |  |  | 135,128 |  |  |  | 4,826 |  |  |  | 101 |  |  |  | 139,853
Corporate bonds |  |  | 1,500 |  |  |  | 36 |  |  |  | - |  |  |  | 1,536
Trust preferred securities |  |  | 250 |  |  |  | - |  |  |  | - |  |  |  | 250
Total |  | $ | 239,254 |  |  |  | 6,292 |  |  |  | 684 |  |  |  | 244,862
(Dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | December 31, 2016
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Loss es |  |  | Estimated Fair Value
Mortgage-backed securities |  | $ | 66,654 |  |  |  | 1,221 |  |  |  | 290 |  |  |  | 67,585
U.S. Government |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
sponsored enterprises |  |  | 38,188 |  |  |  | 308 |  |  |  | 274 |  |  |  | 38,222
State and political subdivisions |  |  | 137,832 |  |  |  | 4,176 |  |  |  | 152 |  |  |  | 141,856
Corporate bonds |  |  | 1,500 |  |  |  | 33 |  |  |  | - |  |  |  | 1,533
Trust preferred securities |  |  | 750 |  |  |  | - |  |  |  | - |  |  |  | 750
Total |  | $ | 244,924 |  |  |  | 5,738 |  |  |  | 716 |  |  |  | 249,946
Current fair value and associated unrealized losses on investments in securities with unrealized losses |
(Dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | March 31, 2017
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses
Mortgage-backed securities |  | $ | 16,534 |  |  |  | 321 |  |  |  | - |  |  |  | - |  |  |  | 16,534 |  |  |  | 321
U.S. Government |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
sponsored enterprises |  |  | 5,832 |  |  |  | 28 |  |  |  | 13,286 |  |  |  | 234 |  |  |  | 19,118 |  |  |  | 262
State and political subdivisions |  |  | 7,101 |  |  |  | 74 |  |  |  | 562 |  |  |  | 27 |  |  |  | 7,663 |  |  |  | 101
Total |  | $ | 29,467 |  |  |  | 423 |  |  |  | 13,848 |  |  |  | 261 |  |  |  | 43,315 |  |  |  | 684
(Dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | December 31, 2016
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total
|  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses
Mortgage-backed securities |  | $ | 15,594 |  |  |  | 290 |  |  |  | - |  |  |  | - |  |  |  | 15,594 |  |  |  | 290
U.S. Government |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
sponsored enterprises |  |  | 10,120 |  |  |  | 94 |  |  |  | 9,562 |  |  |  | 180 |  |  |  | 19,682 |  |  |  | 274
State and political subdivisions |  |  | 10,441 |  |  |  | 123 |  |  |  | 561 |  |  |  | 29 |  |  |  | 11,002 |  |  |  | 152
Total |  | $ | 36,155 |  |  |  | 507 |  |  |  | 10,123 |  |  |  | 209 |  |  |  | 46,278 |  |  |  | 716
Amortized cost and estimated fair value of investment securities available for sale by contractual maturity |
March 31, 2017 |  |  |  |  |
(Dollars in thousands) |  |  |  |  |
|  | Amortized Cost |  |  | Estimated Fair Value
Due within one year |  | $ | 12,140 |  |  | 12,273
Due from one to five years |  |  | 89,495 |  |  | 92,754
Due from five to ten years |  |  | 64,550 |  |  | 65,871
Due after ten years |  |  | 10,331 |  |  | 10,391
Mortgage-backed securities |  |  | 62,488 |  |  | 63,324
Equity securities |  |  | 250 |  |  | 250
Total |  | $ | 239,254 |  |  | 244,863

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