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Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Due in one year or less, amortized cost | $ 0 |
Due after one year through five years, amortized cost | 463,431 |
Due after five years through ten years, amortized cost | 133,079 |
Amortized Cost | 3,084,960 | $ 3,799,851
Due in one year or less, fair value | 0 |
Due after one year through five years, fair value | 421,935 |
Due after five years through ten years, fair value | 118,071 |
Fair Value | 2,918,830 | 3,791,575
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 200,171 |
Amortized Cost | 200,171 | 297,291
Debt securities, available-for-sale, without single maturity date, fair value | 193,261 |
Fair Value | 193,261 | 297,425
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 855,959 |
Amortized Cost | 855,959 | 1,067,770
Debt securities, available-for-sale, without single maturity date, fair value | 827,813 |
Fair Value | 827,813 | 1,066,802
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 138,972 |
Amortized Cost | 138,972 | 149,054
Debt securities, available-for-sale, without single maturity date, fair value | 134,843 |
Fair Value | 134,843 | 148,927
Agency-guaranteed residential collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 152,008 |
Amortized Cost | 152,008 | 199,091
Debt securities, available-for-sale, without single maturity date, fair value | 138,222 |
Fair Value | 138,222 | 196,930
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 1,141,340 |
Amortized Cost | 1,141,340 | 1,248,142
Debt securities, available-for-sale, without single maturity date, fair value | 1,084,685 |
Fair Value | $ 1,084,685 | $ 1,242,465

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27198-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27198-111563 + Details
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