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Securities | 3 Months Ended
--- | ---
Mar. 31, 2019
Investments Debt And Equity Securities [Abstract] |
Securities |
(3) | SECURITIES
The following table summarizes the amortized cost and estimated fair values of debt securities held for investment:
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
March 31, 2019 |  | (Dollars in thousands) |
Mortgage backed securities (1) |  | $ | 122 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 128 |
States and political subdivisions |  |  | 595 |  |  |  | — |  |  |  | — |  |  |  | 595 |
Other securities |  |  | 500 |  |  |  | — |  |  |  | — |  |  |  | 500 |
Total |  | $ | 1,217 |  |  | $ | 6 |  |  | $ | — |  |  | $ | 1,223 |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage backed securities (1) |  | $ | 133 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 138 |
States and political subdivisions |  |  | 795 |  |  |  | — |  |  |  | — |  |  |  | 795 |
Other securities |  |  | 500 |  |  |  | — |  |  |  | — |  |  |  | 500 |
Total |  | $ | 1,428 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 1,433 |
The following table summarizes the amortized cost and estimated fair values of debt securities available for sale:
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
March 31, 2019 |  | (Dollars in thousands) |
U.S. treasuries |  | $ | 651,860 |  |  | $ | 2,847 |  |  | $ | (1,957 | ) |  | $ | 652,750 |
U.S. federal agencies |  |  | 28,106 |  |  |  | — |  |  |  | (152 | ) |  |  | 27,954 |
Mortgage backed securities (1) |  |  | 16,162 |  |  |  | 126 |  |  |  | (576 | ) |  |  | 15,712 |
States and political subdivisions |  |  | 26,989 |  |  |  | 317 |  |  |  | (67 | ) |  |  | 27,239 |
Total |  | $ | 723,117 |  |  | $ | 3,290 |  |  | $ | (2,752 | ) |  | $ | 723,655 |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  | $ | 699,882 |  |  | $ | 1,108 |  |  | $ | (3,524 | ) |  | $ | 697,466 |
U.S. federal agencies |  |  | 30,079 |  |  |  | — |  |  |  | (160 | ) |  |  | 29,919 |
Mortgage backed securities (1) |  |  | 16,367 |  |  |  | 114 |  |  |  | (573 | ) |  |  | 15,908 |
States and political subdivisions |  |  | 27,246 |  |  |  | 277 |  |  |  | (112 | ) |  |  | 27,411 |
Total |  | $ | 773,574 |  |  | $ | 1,499 |  |  | $ | (4,369 | ) |  | $ | 770,704 |
| (1) | Primarily consists of FHLMC, FNMA, GNMA and mortgage backed securities through U.S. agencies.
The maturities of debt securities held for investment and available for sale are summarized in the following table using contractual maturities. Actual maturities may differ from contractual maturities due to obligations that are called or prepaid. For purposes of the maturity table, mortgage-backed securities, which are not due at a single maturity date, have been presented at their contractual maturity.
|  | March 31, 2019 |  |  | December 31, 2018 |
|  | Amortized Cost |  |  | Estimated Fair Value |  |  | Amortized Cost |  |  | Estimated Fair Value |
|  | (Dollars in thousands) |
Held for Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual maturity of debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Within one year |  | $ | 295 |  |  | $ | 295 |  |  | $ | 495 |  |  | $ | 495 |
After one year but within five years |  |  | 368 |  |  |  | 370 |  |  |  | 369 |  |  |  | 370 |
After five years but within ten years |  |  | 552 |  |  |  | 556 |  |  |  | 562 |  |  |  | 565 |
After ten years |  |  | 2 |  |  |  | 2 |  |  |  | 2 |  |  |  | 3 |
Total |  | $ | 1,217 |  |  | $ | 1,223 |  |  | $ | 1,428 |  |  | $ | 1,433 |
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual maturity of debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Within one year |  | $ | 403,084 |  |  | $ | 402,210 |  |  | $ | 411,256 |  |  | $ | 410,327 |
After one year but within five years |  |  | 273,033 |  |  |  | 274,838 |  |  |  | 313,416 |  |  |  | 311,924 |
After five years but within ten years |  |  | 7,265 |  |  |  | 7,487 |  |  |  | 7,524 |  |  |  | 7,685 |
After ten years |  |  | 39,735 |  |  |  | 39,120 |  |  |  | 41,378 |  |  |  | 40,768 |
Total debt securities |  | $ | 723,117 |  |  | $ | 723,655 |  |  | $ | 773,574 |  |  | $ | 770,704 |
The following table is a summary of the Company’s book value of securities that were pledged as collateral for public funds on deposit, repurchase agreements and for other purposes as required or permitted by law:
|  | March 31, 2019 |  |  | December 31, 2018 |
|  | (Dollars in thousands) |
Book value of pledged securities |  | $ | 418,807 |  |  | $ | 472,053 |
Non-Cash investing activities On March 31, 2019, the Company had a $50.0 million security that matured, was removed from the securities portfolio and moved into accrued interest receivable and other assets on the balance sheet. The cash for this matured security was received the following day on April 1, 2019.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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