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Investment Securities - Summary of Available-for-Sale Debt Securities by Stated Maturity (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Due in one year or less, amortized cost | $ 7,500 |
Due after one year through five years, amortized cost | 532,269 |
Due after five years through ten years, amortized cost | 98,461 |
Amortized Cost | 2,911,234 | $ 3,138,534
Due in one year or less, fair value | 7,444 |
Due after one year through five years, fair value | 488,929 |
Due after five years through ten years, fair value | 82,524 |
Fair Value | 2,746,728 | 2,961,015
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 111,915 |
Amortized Cost | 111,915 | 169,170
Debt securities, available-for-sale, without single maturity date, fair value | 104,716 |
Fair Value | 104,716 | 160,542
Agency-guaranteed residential collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 133,425 |
Amortized Cost | 133,425 | 147,481
Debt securities, available-for-sale, without single maturity date, fair value | 118,469 |
Fair Value | 118,469 | 133,864
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 826,764 |
Amortized Cost | 826,764 | 896,992
Debt securities, available-for-sale, without single maturity date, fair value | 815,856 |
Fair Value | 815,856 | 872,738
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 136,111 |
Amortized Cost | 136,111 | 142,222
Debt securities, available-for-sale, without single maturity date, fair value | 131,188 |
Fair Value | 131,188 | 136,357
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt securities, available-for-sale, without single maturity date, amortized cost | 1,064,789 |
Amortized Cost | 1,064,789 | 1,125,583
Debt securities, available-for-sale, without single maturity date, fair value | 997,602 |
Fair Value | $ 997,602 | $ 1,062,261

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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://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 + 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://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 + Details
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