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Investment Securities Available-for-Sale (Tables) | 6 Months Ended
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Jun. 30, 2019
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:
|  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
June 30, 2019 |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
(dollars in thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U. S. agency securities |  | $ | 225,389 |  |  | $ | 940 |  |  | $ | 659 |  |  | $ | 225,670 |
Residential mortgage backed securities |  |  | 440,243 |  |  |  | 5,186 |  |  |  | 1,884 |  |  |  | 443,545 |
Municipal bonds |  |  | 67,835 |  |  |  | 1,503 |  |  |  | — |  |  |  | 69,338 |
Corporate bonds |  |  | 6,502 |  |  |  | 70 |  |  |  | — |  |  |  | 6,572 |
Other equity investments |  |  | 218 |  |  |  | — |  |  |  | — |  |  |  | 218 |
|  | $ | 740,187 |  |  | $ | 7,699 |  |  | $ | 2,543 |  |  | $ | 745,343 |
|  |  |  |  | Gross |  |  | Gross |  |  | Estimated |
December 31, 2018 |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
(dollars in thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U. S. agency securities |  | $ | 260,150 |  |  | $ | 228 |  |  | $ | 4,033 |  |  | $ | 256,345 |
Residential mortgage backed securities |  |  | 477,949 |  |  |  | 1,575 |  |  |  | 7,293 |  |  |  | 472,231 |
Municipal bonds |  |  | 45,814 |  |  |  | 439 |  |  |  | 484 |  |  |  | 45,769 |
Corporate bonds |  |  | 9,503 |  |  |  | 79 |  |  |  | 6 |  |  |  | 9,576 |
Other equity investments |  |  | 218 |  |  |  | — |  |  |  | — |  |  |  | 218 |
|  | $ | 793,634 |  |  | $ | 2,321 |  |  | $ | 11,816 |  |  | $ | 784,139 |
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 |  |  | 12Months |  |  |  |
|  |  |  |  | 12Months |  |  | or Greater |  |  | Total |
|  |  |  |  | Estimated |  |  |  |  |  | Estimated |  |  |  |  |  | Estimated |  |  |  |
June 30, 2019 |  | Number of |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
(dollars in thousands) |  | Securities |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
U. S. agency securities |  |  | 39 |  |  | $ | 26,149 |  |  | $ | 50 |  |  | $ | 99,252 |  |  | $ | 609 |  |  | $ | 125,401 |  |  | $ | 659 |
Residential mortgage backed securities |  |  | 103 |  |  |  | 4,234 |  |  |  | 13 |  |  |  | 174,316 |  |  |  | 1,871 |  |  |  | 178,550 |  |  |  | 1,884 |
Municipal bonds |  |  | 2 |  |  |  | 1,500 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,500 |  |  |  | — |
|  |  | 144 |  |  | $ | 31,883 |  |  | $ | 63 |  |  | $ | 273,568 |  |  | $ | 2,480 |  |  | $ | 305,451 |  |  | $ | 2,543 |
|  |  |  |  | Less than |  |  | 12Months |  |  |  |  |  |  |
|  |  |  |  | 12Months |  |  | or Greater |  |  | Total |
|  |  |  |  | Estimated |  |  |  |  |  | Estimated |  |  |  |  |  | Estimated |  |  |  |
December 31, 2018 |  | Number of |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
(dollars in thousands) |  | Securities |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
U. S. agency securities |  |  | 58 |  |  | $ | 72,679 |  |  | $ | 533 |  |  | $ | 144,636 |  |  | $ | 3,500 |  |  | $ | 217,315 |  |  | $ | 4,033 |
Residential mortgage backed securities |  |  | 151 |  |  |  | 61,199 |  |  |  | 527 |  |  |  | 225,995 |  |  |  | 6,766 |  |  |  | 287,194 |  |  |  | 7,293 |
Municipal bonds |  |  | 11 |  |  |  | 4,299 |  |  |  | 50 |  |  |  | 17,041 |  |  |  | 434 |  |  |  | 21,340 |  |  |  | 484 |
Corporate bonds |  |  | 1 |  |  |  | 1,494 |  |  |  | 6 |  |  |  | — |  |  |  | — |  |  |  | 1,494 |  |  |  | 6 |
|  |  | 221 |  |  | $ | 139,671 |  |  | $ | 1,116 |  |  | $ | 387,672 |  |  | $ | 10,700 |  |  | $ | 527,343 |  |  | $ | 11,816 |
Schedule of amortized cost and estimated fair value of investments available-for-sale by contractual maturity |
|  | June 30, 2019 |  |  | December 31, 2018 |
|  | Amortized |  |  | Estimated |  |  | Amortized |  |  | Estimated |
(dollars in thousands) |  | Cost |  |  | Fair Value |  |  | Cost |  |  | Fair Value |
U. S. agency securities maturing: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oneyear or less |  | $ | 114,260 |  |  | $ | 114,564 |  |  | $ | 128,148 |  |  | $ | 125,545 |
Afteroneyear throughfiveyears |  |  | 103,105 |  |  |  | 103,042 |  |  |  | 119,856 |  |  |  | 118,883 |
Fiveyears throughtenyears |  |  | 8,024 |  |  |  | 8,064 |  |  |  | 12,146 |  |  |  | 11,917 |
Residential mortgage backed securities |  |  | 440,243 |  |  |  | 443,545 |  |  |  | 477,949 |  |  |  | 472,231 |
Municipal bonds maturing: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Oneyear or less |  |  | 6,947 |  |  |  | 6,977 |  |  |  | 8,097 |  |  |  | 8,167 |
Afteroneyear throughfiveyears |  |  | 13,426 |  |  |  | 13,694 |  |  |  | 15,025 |  |  |  | 15,081 |
Fiveyears throughtenyears |  |  | 46,399 |  |  |  | 47,468 |  |  |  | 21,626 |  |  |  | 21,385 |
Aftertenyears |  |  | 1,063 |  |  |  | 1,199 |  |  |  | 1,066 |  |  |  | 1,136 |
Corporate bonds maturing: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Afteroneyear throughfiveyears |  |  | 5,002 |  |  |  | 5,072 |  |  |  | 8,003 |  |  |  | 8,076 |
Aftertenyears |  |  | 1,500 |  |  |  | 1,500 |  |  |  | 1,500 |  |  |  | 1,500 |
Other equity investments |  |  | 218 |  |  |  | 218 |  |  |  | 218 |  |  |  | 218 |
|  | $ | 740,187 |  |  | $ | 745,343 |  |  | $ | 793,634 |  |  | $ | 784,139 |

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- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 + Details
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