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Investment Securities - Summary of Amortized Cost and Approximate Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | $ 3,242,361 |  | $ 3,799,851
Allowance for Credit Losses | (411) |  |
Gross Unrealized Gains | 376 |  | 7,427
Gross Unrealized Losses | (122,215) |  | (15,703)
Fair Value | 3,120,111 |  | 3,791,575
Equity securities | 24,771 |  | 25,575
Investment securities, at fair value | 3,144,882 |  | 3,817,150
Available-for-sale debt securities, accrued interest | 13,000 |  | 11,000
Asset-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 223,661 |  | 297,291
Allowance for Credit Losses | (411) | $ (728) | 0
Gross Unrealized Gains | 0 |  | 253
Gross Unrealized Losses | (3,529) |  | (119)
Fair Value | 219,721 |  | 297,425
Agency-guaranteed residential mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  |  | 9,865
Gross Unrealized Gains |  |  | 0
Gross Unrealized Losses |  |  | (312)
Fair Value |  |  | 9,553
Agency-guaranteed commercial mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  |  | 2,162
Gross Unrealized Gains |  |  | 0
Gross Unrealized Losses |  |  | (10)
Fair Value |  |  | 2,152
Agency-guaranteed residential collateralized mortgage obligations |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 156,339 |  | 199,091
Allowance for Credit Losses | 0 |  |
Gross Unrealized Gains | 0 |  | 154
Gross Unrealized Losses | (9,219) |  | (2,315)
Fair Value | 147,120 |  | 196,930
Agency-guaranteed commercial collateralized mortgage obligations |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost |  |  | 242,668
Gross Unrealized Gains |  |  | 53
Gross Unrealized Losses |  |  | (3,877)
Fair Value |  |  | 238,844
Collateralized loan obligations |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 974,213 |  | 1,067,770
Allowance for Credit Losses | 0 |  |
Gross Unrealized Gains | 0 |  | 247
Gross Unrealized Losses | (23,645) |  | (1,215)
Fair Value | 950,568 |  | 1,066,802
Commercial mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 138,972 |  | 149,054
Allowance for Credit Losses | 0 |  |
Gross Unrealized Gains | 0 |  | 53
Gross Unrealized Losses | (3,188) |  | (180)
Fair Value | 135,784 |  | 148,927
Corporate notes |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 579,324 |  | 575,273
Allowance for Credit Losses | 0 |  |
Gross Unrealized Gains | 376 |  | 6,334
Gross Unrealized Losses | (33,856) |  | (1,561)
Fair Value | 545,844 |  | 580,046
Private label collateralized mortgage obligations |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 1,161,325 |  | 1,248,142
Allowance for Credit Losses | 0 |  |
Gross Unrealized Gains | 0 |  | 333
Gross Unrealized Losses | (47,988) |  | (6,010)
Fair Value | 1,113,337 |  | 1,242,465
State and political subdivision debt securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Amortized Cost | 8,527 |  | 8,535
Allowance for Credit Losses | 0 |  |
Gross Unrealized Gains | 0 |  | 0
Gross Unrealized Losses | (790) |  | (104)
Fair Value | $ 7,737 |  | $ 8,431

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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