v3.8.0.1

Securities (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Investments Debt And Equity Securities [Abstract] |
Summary of AFS Securities Portfolio | The following table provides a summary of the Company’s AFS securities portfolio at December 31:
|  |  | Amortized Cost |  |  |  | Gross Unrealized |  |  |  | Estimated Fair Value |
(dollars in thousands) |  |  |  |  |  | Gains |  |  |  | Losses |  |  |  |
2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
US Treasury securities |  | $ | 499 |  |  | $ | — |  |  | $ | (6 | ) |  | $ | 493 |
Agency mortgage-backed securities |  |  | 471,131 |  |  |  | 287 |  |  |  | (7,399 | ) |  |  | 464,019 |
Beneficial interest – FHLMC securitization |  |  | 35,930 |  |  |  | 1,811 |  |  |  | (1,889 | ) |  |  | 35,852 |
Corporate bonds |  |  | 19,000 |  |  |  | — |  |  |  | — |  |  |  | 19,000 |
Total |  | $ | 526,560 |  |  | $ | 2,098 |  |  | $ | (9,294 | ) |  | $ | 519,364 |
2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
US Treasury securities |  | $ | 300 |  |  | $ | — |  |  | $ | (3 | ) |  | $ | 297 |
Agency mortgage-backed securities |  |  | 476,163 |  |  |  | 160 |  |  |  | (7,414 | ) |  |  | 468,909 |
Beneficial interest – FHLMC securitization |  |  | 42,028 |  |  |  | 711 |  |  |  | (2,367 | ) |  |  | 40,372 |
Total |  | $ | 518,491 |  |  | $ | 871 |  |  | $ | (9,784 | ) |  | $ | 509,578 |
Schedule of Securities in a Continuous Unrealized Loss Position Aggregated by Investment Category and Length of Time | The table below indicates, as of December 31, 2017, the gross unrealized losses and fair values of our investments, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position.
|  | Securities with Unrealized Loss at December 31, 2017 |
(dollars in thousands) |  | Less than 12 months |  |  | 12 months or more |  |  | Total |
| Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
US Treasury securities |  | $ | 197 |  |  | $ | (2 | ) |  | $ | 296 |  |  | $ | (4 | ) |  | $ | 493 |  |  | $ | (6 | )
Agency mortgage backed securities |  |  | 158,984 |  |  |  | (1,394 | ) |  |  | 259,213 |  |  |  | (6,005 | ) |  |  | 418,197 |  |  |  | (7,399 | )
Beneficial interest – FHLMC securitization |  |  | — |  |  |  | — |  |  |  | 8,738 |  |  |  | (1,889 | ) |  |  | 8,738 |  |  |  | (1,889 | )
Total temporarily impaired securities |  | $ | 159,181 |  |  | $ | (1,396 | ) |  | $ | 268,247 |  |  | $ | (7,898 | ) |  | $ | 427,428 |  |  | $ | (9,294 | )
|  | Securities with Unrealized Loss at December 31, 2016 |
(dollars in thousands) |  | Less than 12 months |  |  | 12 months or more |  |  | Total |
| Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
US Treasury securities |  |  | 297 |  |  |  | (3 | ) |  |  | — |  |  |  | — |  |  |  | 297 |  |  |  | (3 | )
Agency mortgage backed securities |  |  | 445,591 |  |  |  | (7,414 | ) |  |  | — |  |  |  | — |  |  |  | 445,591 |  |  |  | (7,414 | )
Beneficial interest – FHLMC securitization |  |  | 18,636 |  |  |  | (2,367 | ) |  |  | — |  |  |  | — |  |  |  | 18,636 |  |  |  | (2,367 | )
Total temporarily impaired securities |  | $ | 464,524 |  |  | $ | (9,784 | ) |  | $ | — |  |  | $ | — |  |  | $ | 464,524 |  |  | $ | (9,784 | )
Scheduled Maturities of Securities AFS Other than Mortgage Backed Securities and the Related Weighted Average Yield | The scheduled maturities of securities AFS, other than agency mortgage backed securities, and the related weighted average yield is as follows as of December 31:
(dollars in thousands) |  | Less than 1 Year |  |  | 1 Through 5 years |  |  | 5 Through 10 Years |  |  | After 10 Years |  |  | Total |
2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized Cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
US Treasury securities |  | $ | — |  |  | $ | 499 |  |  | $ | — |  |  | $ | — |  |  | $ | 499 |
Corporate bonds |  |  | — |  |  |  | — |  |  |  | 19,000 |  |  |  | — |  |  |  | 19,000 |
Total |  |  | — |  |  |  | 499 |  |  |  | 19,000 |  |  |  | — |  |  |  | 19,499 |
Weighted average yield |  |  | — | % |  |  | 1.03 | % |  |  | 5.24 | % |  |  | — | % |  |  | 5.13 | %
Estimated Fair Value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
US Treasury securities |  | $ | — |  |  | $ | 493 |  |  | $ | — |  |  | $ | — |  |  | $ | 493 |
Corporate bonds |  |  | — |  |  |  | — |  |  |  | 19,000 |  |  |  | — |  |  |  | 19,000 |
Total |  | $ | — |  |  | $ | 493 |  |  | $ | 19,000 |  |  | $ | — |  |  | $ | 19,493 |
(dollars in thousands) |  | Less than 1 Year |  |  | 1 Through 5 years |  |  | 5 Through 10 Years |  |  | After 10 Years |  |  | Total |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized Cost: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
US Treasury securities |  | $ | — |  |  | $ | 300 |  |  | $ | — |  |  | $ | — |  |  | $ | 300 |
Weighted average yield |  |  | — | % |  |  | 0.90 | % |  |  | — | % |  |  | — | % |  |  | 0.90 | %
Estimated Fair Value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
US Treasury securities |  | $ | — |  |  | $ | 297 |  |  | $ | — |  |  | $ | — |  |  | $ | 297 |
Total |  | $ | — |  |  | $ | 297 |  |  | $ | — |  |  | $ | — |  |  | $ | 297 |

X
- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 7: 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
Name: | us-gaap_AvailableForSaleSecuritiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the reconciliation of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesReconciliationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of investments in an unrealized loss position 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), including: (a) the aggregate related fair value of investments with unrealized losses, (b) 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
Name: | us-gaap_ScheduleOfTemporaryImpairmentLossesInvestmentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration