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Investment Securities Available-for-Sale (Tables) | 9 Months Ended
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Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Schedule of amortized cost and estimated fair value of securities available-for-sale | Amortized cost and estimated fair value of securities available-for-sale are summarized as follows:
September 30, 2018 (dollars in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
U. S. agency securities |  | $ | 236,853 |  |  | $ | — |  |  | $ | 6,528 |  |  | $ | 230,325 |
Residential mortgage backed securities |  |  | 448,335 |  |  |  | 140 |  |  |  | 12,126 |  |  |  | 436,349 |
Municipal bonds |  |  | 48,203 |  |  |  | 391 |  |  |  | 858 |  |  |  | 47,736 |
Corporate bonds |  |  | 8,004 |  |  |  | 61 |  |  |  | 19 |  |  |  | 8,046 |
Other equity investments |  |  | 218 |  |  |  | — |  |  |  | — |  |  |  | 218 |
|  | $ | 741,613 |  |  | $ | 592 |  |  | $ | 19,531 |  |  | $ | 722,674 |
December 31, 2017 (dollars in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
U. S. agency securities |  | $ | 198,115 |  |  | $ | 283 |  |  | $ | 2,414 |  |  | $ | 195,984 |
Residential mortgage backed securities |  |  | 322,067 |  |  |  | 187 |  |  |  | 4,418 |  |  |  | 317,836 |
Municipal bonds |  |  | 60,976 |  |  |  | 1,295 |  |  |  | 214 |  |  |  | 62,057 |
Corporate bonds |  |  | 13,010 |  |  |  | 163 |  |  |  | — |  |  |  | 13,173 |
Other equity investments |  |  | 218 |  |  |  | — |  |  |  | — |  |  |  | 218 |
|  | $ | 594,386 |  |  | $ | 1,928 |  |  | $ | 7,046 |  |  | $ | 589,268 |
Schedule of gross unrealized losses and fair value by length of time that the individual available-for-sale securities have been in a continuous unrealized loss position | Gross unrealized losses and fair value by length of time that the individual available-for-sale securities have been in a continuous unrealized loss position are as follows:
|  |  |  |  | Less than 12 Months |  |  | 12 Months or Greater |  |  | Total |
September 30, 2018 (dollars in thousands) |  | Number of Securities |  |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |
U. S. agency securities |  |  | 61 |  |  | $ | 111,702 |  |  | $ | 1,909 |  |  | $ | 115,678 |  |  | $ | 4,619 |  |  | $ | 227,380 |  |  | $ | 6,528 |
Residential mortgage backed securities |  |  | 184 |  |  |  | 237,720 |  |  |  | 3,938 |  |  |  | 190,668 |  |  |  | 8,188 |  |  |  | 428,388 |  |  |  | 12,126 |
Municipal bonds |  |  | 16 |  |  |  | 16,388 |  |  |  | 352 |  |  |  | 10,440 |  |  |  | 506 |  |  |  | 26,828 |  |  |  | 858 |
Corporate bonds |  |  | 2 |  |  |  | 2,981 |  |  |  | 19 |  |  |  | — |  |  |  | — |  |  |  | 2,981 |  |  |  | 19 |
|  |  | 263 |  |  | $ | 368,791 |  |  | $ | 6,218 |  |  | $ | 316,786 |  |  | $ | 13,313 |  |  | $ | 685,577 |  |  | $ | 19,531 |
|  |  |  |  | Less than 12 Months |  |  | 12 Months or Greater |  |  | Total |
December 31, 2017 (dollars in thousands) |  | Number of Securities |  |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |
U. S. agency securities |  |  | 38 |  |  | $ | 102,264 |  |  | $ | 1,073 |  |  | $ | 55,093 |  |  | $ | 1,341 |  |  | $ | 157,357 |  |  | $ | 2,414 |
Residential mortgage backed securities |  |  | 137 |  |  |  | 152,350 |  |  |  | 1,306 |  |  |  | 147,953 |  |  |  | 3,112 |  |  |  | 300,303 |  |  |  | 4,418 |
Municipal bonds |  |  | 8 |  |  |  | 17,446 |  |  |  | 214 |  |  |  | — |  |  |  | — |  |  |  | 17,446 |  |  |  | 214 |
|  |  | 183 |  |  | $ | 272,060 |  |  | $ | 2,593 |  |  | $ | 203,046 |  |  | $ | 4,453 |  |  | $ | 475,106 |  |  | $ | 7,046 |
Schedule of available-for-sale securities by contractual maturity | The amortized cost and estimated fair value of investments available-for-sale at September 30, 2018 and December 31, 2017 by contractual maturity are shown in the table below.
|  | September 30, 2018 |  |  | December 31, 2017 |
(dollars in thousands) |  | Amortized Cost |  |  | Estimated Fair Value |  |  | Amortized Cost |  |  | Estimated Fair Value |
U. S. agency securities maturing: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
One year or less |  | $ | 119,017 |  |  | $ | 114,692 |  |  | $ | 109,893 |  |  | $ | 108,198 |
After one year through five years |  |  | 104,464 |  |  |  | 102,953 |  |  |  | 74,106 |  |  |  | 73,916 |
Five years through ten years |  |  | 13,372 |  |  |  | 12,680 |  |  |  | 14,116 |  |  |  | 13,870 |
Residential mortgage backed securities |  |  | 448,335 |  |  |  | 436,349 |  |  |  | 322,067 |  |  |  | 317,836 |
Municipal bonds maturing: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
One year or less |  |  | 9,882 |  |  |  | 9,969 |  |  |  | 5,068 |  |  |  | 5,171 |
After one year through five years |  |  | 15,579 |  |  |  | 15,541 |  |  |  | 19,405 |  |  |  | 19,879 |
Five years through ten years |  |  | 21,675 |  |  |  | 21,094 |  |  |  | 35,432 |  |  |  | 35,846 |
After ten years |  |  | 1,067 |  |  |  | 1,132 |  |  |  | 1,071 |  |  |  | 1,161 |
Corporate bonds maturing: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
After one year through five years |  |  | 6,504 |  |  |  | 6,546 |  |  |  | 11,510 |  |  |  | 11,673 |
After ten years |  |  | 1,500 |  |  |  | 1,500 |  |  |  | 1,500 |  |  |  | 1,500 |
Other equity investments |  |  | 218 |  |  |  | 218 |  |  |  | 218 |  |  |  | 218 |
|  | $ | 741,613 |  |  | $ | 722,674 |  |  | $ | 594,386 |  |  | $ | 589,268 |

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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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