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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Schedule of investment securities available-for-sale | The following table shows investment securities available-for-sale.
(Dollars in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
March 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and Federal agencies securities |  | $ | 510,739 |  |  | $ | 7 |  |  | $ | (7,749 | ) |  | $ | 502,997 |
U.S. States and political subdivisions securities |  | 98,740 |  |  | 321 |  |  | (1,076 | ) |  | 97,985 |
Mortgage-backed securities — Federal agencies |  | 301,717 |  |  | 997 |  |  | (6,384 | ) |  | 296,330 |
Corporate debt securities |  | 44,584 |  |  | — |  |  | (528 | ) |  | 44,056 |
Foreign government and other securities |  | 700 |  |  | 8 |  |  | — |  |  | 708 |
Total debt securities available-for-sale |  | $ | 956,480 |  |  | $ | 1,333 |  |  | $ | (15,737 | ) |  | $ | 942,076 |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and Federal agencies securities |  | $ | 471,508 |  |  | $ | 57 |  |  | $ | (3,446 | ) |  | $ | 468,119 |
U.S. States and political subdivisions securities |  | 116,260 |  |  | 648 |  |  | (908 | ) |  | 116,000 |
Mortgage-backed securities — Federal agencies |  | 289,327 |  |  | 1,456 |  |  | (2,873 | ) |  | 287,910 |
Corporate debt securities |  | 31,573 |  |  | 5 |  |  | (284 | ) |  | 31,294 |
Foreign government and other securities |  | 700 |  |  | 10 |  |  | — |  |  | 710 |
Total debt securities available-for-sale |  | $ | 909,368 |  |  | $ | 2,176 |  |  | $ | (7,511 | ) |  | $ | 904,033 |
Schedule of contractual maturities of investments in debt securities available-for-sale | The following table shows the contractual maturities of investments in debt securities available-for-sale at March 31, 2018. 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.
(Dollars in thousands) |  | Amortized Cost |  | Fair Value
Due in one year or less |  | $ | 73,984 |  |  | $ | 73,935 |
Due after one year through five years |  | 560,259 |  |  | 551,743 |
Due after five years through ten years |  | 20,520 |  |  | 20,068 |
Due after ten years |  | — |  |  | — |
Mortgage-backed securities |  | 301,717 |  |  | 296,330 |
Total debt securities available-for-sale |  | $ | 956,480 |  |  | $ | 942,076 |
Schedule of gross unrealized losses and fair value by investment category and age | The following table summarizes gross unrealized losses and fair value by investment category and age.
|  | Less than 12 Months |  | 12 months or Longer |  | Total
(Dollars in thousands) |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
March 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and Federal agencies securities |  | $ | 399,359 |  |  | $ | (4,388 | ) |  | $ | 88,465 |  |  | $ | (3,361 | ) |  | $ | 487,824 |  |  | $ | (7,749 | )
U.S. States and political subdivisions securities |  | 46,927 |  |  | (484 | ) |  | 18,067 |  |  | (592 | ) |  | 64,994 |  |  | (1,076 | )
Mortgage-backed securities - Federal agencies |  | 175,903 |  |  | (3,672 | ) |  | 67,169 |  |  | (2,712 | ) |  | 243,072 |  |  | (6,384 | )
Corporate debt securities |  | 34,146 |  |  | (184 | ) |  | 9,910 |  |  | (344 | ) |  | 44,056 |  |  | (528 | )
Foreign government and other securities |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total debt securities available-for-sale |  | $ | 656,335 |  |  | $ | (8,728 | ) |  | $ | 183,611 |  |  | $ | (7,009 | ) |  | $ | 839,946 |  |  | $ | (15,737 | )
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and Federal agencies securities |  | $ | 311,865 |  |  | $ | (1,161 | ) |  | $ | 89,617 |  |  | $ | (2,285 | ) |  | $ | 401,482 |  |  | $ | (3,446 | )
U.S. States and political subdivisions securities |  | 34,971 |  |  | (287 | ) |  | 24,909 |  |  | (621 | ) |  | 59,880 |  |  | (908 | )
Mortgage-backed securities - Federal agencies |  | 137,169 |  |  | (1,336 | ) |  | 60,162 |  |  | (1,537 | ) |  | 197,331 |  |  | (2,873 | )
Corporate debt securities |  | 13,747 |  |  | (57 | ) |  | 10,048 |  |  | (227 | ) |  | 23,795 |  |  | (284 | )
Foreign government and other securities |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total debt securities available-for-sale |  | $ | 497,752 |  |  | $ | (2,841 | ) |  | $ | 184,736 |  |  | $ | (4,670 | ) |  | $ | 682,488 |  |  | $ | (7,511 | )
Schedule of gross realized gains and losses from securities available-for-sale portfolio | The following table shows the gross realized gains and losses from the securities available-for-sale portfolio, including marketable equity securities. Realized gains and losses of all securities are computed using the specific identification cost basis.
|  | Three Months Ended March 31,
(Dollars in thousands) |  | 2018 |  | 2017
Gross realized gains |  | $ | 2 |  |  | $ | 1,285 |
Gross realized losses |  | (347 | ) |  | — |
OTTI losses |  | — |  |  | — |
Net realized gains (losses) |  | $ | (345 | ) |  | $ | 1,285 |

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: 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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