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Investment Securities | 3 Months Ended
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Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract] |
Investment Securities | Investment Securities Our available-for-sale investment securities were as follows:
| Amortized cost |  | Gross unrealized gains |  | Gross unrealized losses |  | Fair value
| (In thousands)
March 31, 2023 |
Corporate bonds | $ | 10,000 |  |  | $ | — |  |  | $ | (657) |  |  | $ | 9,343 |
Agency bond securities | 240,315 |  |  | — |  |  | (43,626) |  |  | 196,689 |
Agency mortgage-backed securities | 2,475,406 |  |  | 6 |  |  | (335,973) |  |  | 2,139,439 |
Municipal bonds | 29,552 |  |  | — |  |  | (5,691) |  |  | 23,861 |
Total investment securities | $ | 2,755,273 |  |  | $ | 6 |  |  | $ | (385,947) |  |  | $ | 2,369,332 |
December 31, 2022 |  |  |  |  |  |  |
Corporate bonds | $ | 10,000 |  |  | $ | — |  |  | $ | (654) |  |  | $ | 9,346 |
Agency bond securities | 240,272 |  |  | — |  |  | (47,166) |  |  | 193,106 |
Agency mortgage-backed securities | 2,511,958 |  |  | 8 |  |  | (373,704) |  |  | 2,138,262 |
Municipal bonds | 29,613 |  |  | — |  |  | (6,640) |  |  | 22,973 |
Total investment securities | $ | 2,791,843 |  |  | $ | 8 |  |  | $ | (428,164) |  |  | $ | 2,363,687 |
Note 4—Investment Securities (continued) As of March 31, 2023 and December 31, 2022, the gross unrealized losses and fair values of available-for-sale investment securities that were in unrealized loss positions were as follows:
| Less than 12 months |  | 12 months or more |  | Total fair value |  | Total unrealized loss
| Fair value |  | Unrealized loss |  | Fair value |  | Unrealized loss |  |
| (In thousands)
March 31, 2023 |
Corporate bonds | $ | — |  |  | $ | — |  |  | $ | 9,343 |  |  | $ | (657) |  |  | $ | 9,343 |  |  | $ | (657) |
Agency bond securities | 9,129 |  |  | (343) |  |  | 187,559 |  |  | (43,283) |  |  | 196,688 |  |  | (43,626) |
Agency mortgage-backed securities | 599,305 |  |  | (25,615) |  |  | 1,537,565 |  |  | (310,358) |  |  | 2,136,870 |  |  | (335,973) |
Municipal bonds | 4,747 |  |  | (288) |  |  | 19,114 |  |  | (5,403) |  |  | 23,861 |  |  | (5,691) |
Total investment securities | $ | 613,181 |  |  | $ | (26,246) |  |  | $ | 1,753,581 |  |  | $ | (359,701) |  |  | $ | 2,366,762 |  |  | $ | (385,947) |
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |
Corporate bonds | $ | — |  |  | $ | — |  |  | $ | 9,346 |  |  | $ | (654) |  |  | $ | 9,346 |  |  | $ | (654) |
Agency bond securities | 8,972 |  |  | (457) |  |  | 184,133 |  |  | (46,709) |  |  | 193,105 |  |  | (47,166) |
Agency mortgage-backed securities | 892,068 |  |  | (67,569) |  |  | 1,243,588 |  |  | (306,135) |  |  | 2,135,656 |  |  | (373,704) |
Municipal bonds | 16,333 |  |  | (3,370) |  |  | 6,641 |  |  | (3,270) |  |  | 22,974 |  |  | (6,640) |
Total investment securities | $ | 917,373 |  |  | $ | (71,396) |  |  | $ | 1,443,708 |  |  | $ | (356,768) |  |  | $ | 2,361,081 |  |  | $ | (428,164) |
Our investments generally consist of highly rated securities, substantially all of which are directly or indirectly backed by the U.S. federal government, as our investment policy restricts our investments to highly liquid, low credit risk assets. As such, we have not recorded any significant credit-related impairment losses during the three months ended March 31, 2023 or 2022 on our available-for-sale investment securities. Unrealized losses as of March 31, 2023 and December 31, 2022 are the result of increases in interest rates as our investment portfolio is comprised predominantly of fixed rate securities. Substantially all of the underlying securities within our investment portfolio were in an unrealized loss position as of March 31, 2023 and December 31, 2022 due to the timing of our investment purchases, as a significant portion of our investments were purchased prior to recent increases in interest rates by the Federal Reserve, and general volatility in market conditions. We do not intend to sell our investments, and we have determined that it is more likely than not that we will not be required to sell our investments before recovery of their amortized cost bases, which may be at maturity. As of March 31, 2023, the contractual maturities of our available-for-sale investment securities were as follows:
| Amortized cost |  | Fair value
| (In thousands)
Due in one year or less | $ | 15,837 |  |  | $ | 15,660 |
Due after one year through five years | 51,093 |  |  | 46,045 |
Due after five years through ten years | 174,222 |  |  | 142,045 |
Due after ten years | 54,552 |  |  | 41,804 |
Mortgage and asset-backed securities | 2,459,569 |  |  | 2,123,778 |
Total investment securities | $ | 2,755,273 |  |  | $ | 2,369,332 |
The expected payments on mortgage-backed and asset-backed securities may not coincide with their contractual maturities because the issuers have the right to call or prepay certain obligations.

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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 https://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 https://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 https://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 https://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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