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Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-sale Securities | The amortized cost and fair value of securities available-for-sale and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income were as follows:
|  | As of December 31, 2017
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
|  | (In Thousands)
Available-for-sale: |  |  |  |  |  |  |  |
U.S. government agency obligations - government-sponsored enterprises |  | $ | 999 |  |  | $ | 1 |  |  | $ | — |  |  | $ | 1,000 |
Municipal obligations |  | 9,494 |  |  | 2 |  |  | (82 | ) |  | 9,414 |
Collateralized mortgage obligations - government issued |  | 22,313 |  |  | 149 |  |  | (213 | ) |  | 22,249 |
Collateralized mortgage obligations - government-sponsored enterprises |  | 91,480 |  |  | 24 |  |  | (1,199 | ) |  | 90,305 |
Other securities |  | 3,040 |  |  | 3 |  |  | (6 | ) |  | 3,037 |
|  | $ | 127,326 |  |  | $ | 179 |  |  | $ | (1,500 | ) |  | $ | 126,005 |
|  | As of December 31, 2016
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
|  | (In Thousands)
Available-for-sale: |  |  |  |  |  |  |  |
U.S. government agency obligations - government-sponsored enterprises |  | $ | 6,298 |  |  | $ | 7 |  |  | $ | (10 | ) |  | $ | 6,295 |
Municipal obligations |  | 8,246 |  |  | 2 |  |  | (92 | ) |  | 8,156 |
Asset-backed securities |  | 1,116 |  |  | — |  |  | (35 | ) |  | 1,081 |
Collateralized mortgage obligations - government issued |  | 30,936 |  |  | 423 |  |  | (146 | ) |  | 31,213 |
Collateralized mortgage obligations - government-sponsored enterprises |  | 99,865 |  |  | 252 |  |  | (969 | ) |  | 99,148 |
|  | $ | 146,461 |  |  | $ | 684 |  |  | $ | (1,252 | ) |  | $ | 145,893 |
Schedule of Held-to-maturity Securities | The amortized cost and fair value of securities held-to-maturity and the corresponding amounts of gross unrealized gains and losses were as follows:
|  | As of December 31, 2017
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
|  | (In Thousands)
Held-to-maturity: |  |  |  |  |  |  |  |
U.S. government agency obligations - government-sponsored enterprises |  | $ | 1,499 |  |  | $ | — |  |  | $ | (9 | ) |  | $ | 1,490 |
Municipal obligations |  | 21,680 |  |  | 176 |  |  | (34 | ) |  | 21,822 |
Collateralized mortgage obligations - government issued |  | 9,072 |  |  | 1 |  |  | (130 | ) |  | 8,943 |
Collateralized mortgage obligations - government-sponsored enterprises |  | 5,527 |  |  | — |  |  | (86 | ) |  | 5,441 |
|  | $ | 37,778 |  |  | $ | 177 |  |  | $ | (259 | ) |  | $ | 37,696 |
|  | As of December 31, 2016
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
|  | (In Thousands)
Held-to-maturity: |  |  |  |  |  |  |  |
U.S. government agency obligations - government-sponsored enterprises |  | $ | 1,497 |  |  | $ | 2 |  |  | $ | (5 | ) |  | $ | 1,494 |
Municipal obligations |  | 21,173 |  |  | 62 |  |  | (78 | ) |  | 21,157 |
Collateralized mortgage obligations - government issued |  | 9,148 |  |  | 17 |  |  | (38 | ) |  | 9,127 |
Collateralized mortgage obligations - government-sponsored enterprises |  | 6,794 |  |  | 6 |  |  | (58 | ) |  | 6,742 |
|  | $ | 38,612 |  |  | $ | 87 |  |  | $ | (179 | ) |  | $ | 38,520 |
Realized gains and losses on sale of securities | Total proceeds and gross realized gains and losses from sales of securities available-for-sale were as follows:
|  | For the Year Ended December 31,
|  | 2017 |  | 2016 |  | 2015
|  | (In Thousands)
Gross gains |  | $ | 92 |  |  | $ | 10 |  |  | $ | — |
Gross losses |  | (495 | ) |  | — |  |  | — |
Net (losses) gains on sale of available-for-sale securities |  | $ | (403 | ) |  | $ | 10 |  |  | $ | — |
Proceeds from sale of available-for-sale securities |  | $ | 40,144 |  |  | $ | 5,227 |  |  | $ | — |
Investments Classified by Contractual Maturity | The amortized cost and fair value of securities by contractual maturity at December 31, 2017 are shown below. Actual maturities may differ from contractual maturities because issuers have the right to call or prepay certain obligations with or without call or prepayment penalties.
|  | Available-for-Sale |  | Held-to-Maturity
|  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
|  | (In Thousands)
Due in one year or less |  | $ | 5,090 |  |  | $ | 5,080 |  |  | $ | 1,499 |  |  | $ | 1,490 |
Due in one year through five years |  | 13,506 |  |  | 13,416 |  |  | 10,673 |  |  | 10,704 |
Due in five through ten years |  | 35,941 |  |  | 35,642 |  |  | 15,713 |  |  | 15,734 |
Due in over ten years |  | 72,789 |  |  | 71,867 |  |  | 9,893 |  |  | 9,768 |
|  | $ | 127,326 |  |  | $ | 126,005 |  |  | $ | 37,778 |  |  | $ | 37,696 |
Schedule of Unrealized Loss on Investments | A summary of unrealized loss information for securities held-to-maturity, categorized by security type and length of time for which the security has been in a continuous unrealized loss position, follows:
|  | December 31, 2017
|  | Less than 12 Months |  | 12 Months or Longer |  | Total
|  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
|  | (In Thousands)
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency obligations - government-sponsored enterprises |  | $ | — |  |  | $ | — |  |  | $ | 1,499 |  |  | $ | 9 |  |  | $ | 1,499 |  |  | $ | 9 |
Municipal obligations |  | 3,723 |  |  | 27 |  |  | 259 |  |  | 7 |  |  | 3,982 |  |  | 34 |
Collateralized mortgage obligations - government issued |  | 3,868 |  |  | 51 |  |  | 4,677 |  |  | 79 |  |  | 8,545 |  |  | 130 |
Collateralized mortgage obligations - government-sponsored enterprises |  | — |  |  | — |  |  | 5,527 |  |  | 86 |  |  | 5,527 |  |  | 86 |
|  | $ | 7,591 |  |  | $ | 78 |  |  | $ | 11,962 |  |  | $ | 181 |  |  | $ | 19,553 |  |  | $ | 259 |
|  | December 31, 2016
|  | Less than 12 Months |  | 12 Months or Longer |  | Total
|  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
|  | (In Thousands)
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency obligations - government-sponsored enterprises |  | $ | 1,000 |  |  | $ | 5 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,000 |  |  | $ | 5 |
Municipal obligations |  | 9,472 |  |  | 78 |  |  | — |  |  | — |  |  | 9,472 |  |  | 78 |
Collateralized mortgage obligations - government issued |  | 6,980 |  |  | 38 |  |  | — |  |  | — |  |  | 6,980 |  |  | 38 |
Collateralized mortgage obligations - government-sponsored enterprises |  | 4,682 |  |  | 58 |  |  | — |  |  | — |  |  | 4,682 |  |  | 58 |
|  | $ | 22,134 |  |  | $ | 179 |  |  | $ | — |  |  | $ | — |  |  | $ | 22,134 |  |  | $ | 179 |
A summary of unrealized loss information for securities available-for-sale, categorized by security type and length of time for which the security has been in a continuous unrealized loss position, follows:
|  | December 31, 2017
|  | Less than 12 Months |  | 12 Months or Longer |  | Total
|  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
|  | (In Thousands)
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
Municipal obligations |  | $ | 6,132 |  |  | $ | 43 |  |  | $ | 2,755 |  |  | $ | 39 |  |  | $ | 8,887 |  |  | $ | 82 |
Collateralized mortgage obligations - government issued |  | 7,104 |  |  | 40 |  |  | 6,715 |  |  | 173 |  |  | 13,819 |  |  | 213 |
Collateralized mortgage obligations - government-sponsored enterprises |  | 59,256 |  |  | 476 |  |  | 28,004 |  |  | 723 |  |  | 87,260 |  |  | 1,199 |
Other securities |  | 1,954 |  |  | 6 |  |  | — |  |  | — |  |  | 1,954 |  |  | 6 |
|  | $ | 74,446 |  |  | $ | 565 |  |  | $ | 37,474 |  |  | $ | 935 |  |  | $ | 111,920 |  |  | $ | 1,500 |
|  | December 31, 2016
|  | Less than 12 Months |  | 12 Months or Longer |  | Total
|  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
|  | (In Thousands)
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency obligations - government-sponsored enterprises |  | $ | 1,991 |  |  | $ | 10 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,991 |  |  | $ | 10 |
Municipal obligations |  | 7,207 |  |  | 89 |  |  | 406 |  |  | 3 |  |  | 7,613 |  |  | 92 |
Asset-backed securities |  | — |  |  | — |  |  | 1,081 |  |  | 35 |  |  | 1,081 |  |  | 35 |
Collateralized mortgage obligations - government issued |  | 10,552 |  |  | 130 |  |  | 493 |  |  | 16 |  |  | 11,045 |  |  | 146 |
Collateralized mortgage obligations - government-sponsored enterprises |  | 54,843 |  |  | 931 |  |  | 1,819 |  |  | 38 |  |  | 56,662 |  |  | 969 |
|  | $ | 74,593 |  |  | $ | 1,160 |  |  | $ | 3,799 |  |  | $ | 92 |  |  | $ | 78,392 |  |  | $ | 1,252 |

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- Definition Tabular disclosure of the realized and unrealized gains and losses reported in the statement of income which have resulted from the sale and holding of marketable securities, respectively, as well as the sale or disposal of cost method investments. Such amounts would include realized gains and losses on the sale or disposal of trading, available-for-sale, and held-to-maturity securities, unrealized gains and losses on trading securities, unrealized gains and losses on available-for-sale and held-to-maturity securities transferred to the trading securities category, realized gains and losses on the sale or disposal of cost method investments, and losses recognized for other than temporary impairments (OTTI) of such investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27405-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.M) -URI http://asc.fasb.org/extlink&oid=65877573&loc=d3e87990-122713 + Details
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