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Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses | The amortized cost and fair value of securities, with gross unrealized gains and losses, follows:
|  | (In Thousands) |
|  | 2017 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Market Value |
Available-for-Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  | $ | 21,219 |  |  | $ | — |  |  | $ | (241 | ) |  | $ | 20,978 |
U.S. Government agencies |  |  | 82,198 |  |  |  | — |  |  |  | (1,732 | ) |  |  | 80,466 |
Mortgage-backed securities |  |  | 40,236 |  |  |  | 64 |  |  |  | (790 | ) |  |  | 39,510 |
State and local governments |  |  | 55,512 |  |  |  | 437 |  |  |  | (505 | ) |  |  | 55,444 |
Total available-for-sale securities |  | $ | 199,165 |  |  | $ | 501 |  |  | $ | (3,268 | ) |  | $ | 196,398 |
|  | (In Thousands) |
|  | 2016 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Market Value |
Available-for-Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury |  | $ | 24,920 |  |  | $ | 1 |  |  | $ | (146 | ) |  | $ | 24,775 |
U.S. Government agencies |  |  | 84,266 |  |  |  | 3 |  |  |  | (1,795 | ) |  |  | 82,474 |
Mortgage-backed securities |  |  | 49,155 |  |  |  | 185 |  |  |  | (879 | ) |  |  | 48,461 |
State and local governments |  |  | 63,173 |  |  |  | 634 |  |  |  | (990 | ) |  |  | 62,817 |
Total available-for-sale securities |  | $ | 221,514 |  |  | $ | 823 |  |  | $ | (3,810 | ) |  | $ | 218,527 |
Gross Unrealized Losses, Aggregated by Investment Category and Length of Time | Information pertaining to securities with gross unrealized losses at December 31, 2017 and 2016, aggregated by investment category and length of time that individual securities have been in a continuous loss position follows:
|  | 2017 |
|  | (In Thousands) Less Than Twelve Months |  |  | (In Thousands) Twelve Months & Over |
|  | Gross Unrealized Losses |  |  | Fair Value |  |  |  |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. Treasury |  | $ | (36 | ) |  | $ | 6,924 |  |  |  |  |  |  | $ | (205 | ) |  | $ | 14,054 |
U.S. Government agencies |  |  | (314 | ) |  |  | 27,328 |  |  |  |  |  |  |  | (1,418 | ) |  |  | 53,139 |
Mortgage-backed securities |  |  | (70 | ) |  |  | 7,149 |  |  |  |  |  |  |  | (720 | ) |  |  | 28,080 |
State and local governments |  |  | (205 | ) |  |  | 24,999 |  |  |  |  |  |  |  | (300 | ) |  |  | 11,567 |
Total available-for-sales securities |  | $ | (625 | ) |  | $ | 66,400 |  |  |  |  |  |  | $ | (2,643 | ) |  | $ | 106,840 |
|  | 2016 |
|  | (In Thousands) Less Than Twelve Months |  |  | (In Thousands) Twelve Months & Over |
|  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. Treasury |  | $ | (146 | ) |  | $ | 15,745 |  |  | $ | — |  |  | $ | — |
U.S. Government agencies |  |  | (1,795 | ) |  |  | 77,471 |  |  |  | — |  |  |  | — |
Mortgage-backed securities |  |  | (879 | ) |  |  | 36,474 |  |  |  | — |  |  |  | — |
State and local governments |  |  | (983 | ) |  |  | 37,540 |  |  |  | (7 | ) |  |  | 526 |
Total available-for-sales securities |  | $ | (3,803 | ) |  | $ | 167,230 |  |  | $ | (7 | ) |  | $ | 526 |
Gross Realized Gains and Losses | gross realized gains and losses for the years ended December 31, as presented below:
|  | (In Thousands) |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Gross realized gains |  | $ | 58 |  |  | $ | 598 |  |  | $ | 451 |
Gross realized losses |  |  | (11 | ) |  |  | (10 | ) |  |  | — |
Net realized gains |  | $ | 47 |  |  | $ | 588 |  |  | $ | 451 |
Tax expense related to net realized gains |  | $ | 16 |  |  | $ | 200 |  |  | $ | 153 |
Amortized Cost and Fair Value of Debt Securities, by Contractual Maturity | The amortized cost and fair value of debt securities at December 31, 2017, by contractual maturity, are shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
|  | (In Thousands) |
|  | Amortized Cost |  |  | Fair Value |
One year or less |  | $ | 21,644 |  |  | $ | 21,618 |
After one year through five years |  |  | 84,514 |  |  |  | 83,685 |
After five years through ten years |  |  | 49,908 |  |  |  | 48,810 |
After ten years |  |  | 2,863 |  |  |  | 2,775 |
Total |  | $ | 158,929 |  |  | $ | 156,888 |
Mortgage-backed securities |  |  | 40,236 |  |  |  | 39,510 |
Total |  | $ | 199,165 |  |  | $ | 196,398 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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