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Investment Securities - Gross Unrealized Losses and Fair Value, Aggregated by Investment Category (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | $ 1,585,495 | $ 2,024,753
Less Than 12 Months, Unrealized Losses | (102,076) | (15,567)
12 Months or More, Fair Value | 901,562 | 6,818
12 Months or More, Unrealized Losses | (75,307) | (136)
Fair Value | 2,487,057 | 2,031,571
Unrealized Losses | (177,383) | (15,703)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 160,542 | 54,753
Less Than 12 Months, Unrealized Losses | (8,050) | (119)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Fair Value | 160,542 | 54,753
Unrealized Losses | (8,050) | (119)
Agency-guaranteed residential mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value |  | 9,554
Less Than 12 Months, Unrealized Losses |  | (312)
12 Months or More, Fair Value |  | 0
12 Months or More, Unrealized Losses |  | 0
Fair Value |  | 9,554
Unrealized Losses |  | (312)
Agency-guaranteed commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value |  | 2,152
Less Than 12 Months, Unrealized Losses |  | (10)
12 Months or More, Fair Value |  | 0
12 Months or More, Unrealized Losses |  | 0
Fair Value |  | 2,152
Unrealized Losses |  | (10)
Agency-guaranteed residential collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 133,864 | 173,492
Less Than 12 Months, Unrealized Losses | (13,617) | (2,315)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Losses | 0 | 0
Fair Value | 133,864 | 173,492
Unrealized Losses | (13,617) | (2,315)
Agency-guaranteed commercial collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value |  | 118,334
Less Than 12 Months, Unrealized Losses |  | (3,877)
12 Months or More, Fair Value |  | 0
12 Months or More, Unrealized Losses |  | 0
Fair Value |  | 118,334
Unrealized Losses |  | (3,877)
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 386,701 | 715,250
Less Than 12 Months, Unrealized Losses | (13,516) | (1,215)
12 Months or More, Fair Value | 315,270 | 0
12 Months or More, Unrealized Losses | (10,826) | 0
Fair Value | 701,971 | 715,250
Unrealized Losses | (24,342) | (1,215)
Commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 39,828 | 122,597
Less Than 12 Months, Unrealized Losses | (1,410) | (180)
12 Months or More, Fair Value | 93,005 | 0
12 Months or More, Unrealized Losses | (4,456) | 0
Fair Value | 132,833 | 122,597
Unrealized Losses | (5,866) | (180)
Corporate notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 386,464 | 188,100
Less Than 12 Months, Unrealized Losses | (36,119) | (1,561)
12 Months or More, Fair Value | 178,955 | 0
12 Months or More, Unrealized Losses | (25,759) | 0
Fair Value | 565,419 | 188,100
Unrealized Losses | (61,878) | (1,561)
Private label collateralized mortgage obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value | 478,096 | 632,091
Less Than 12 Months, Unrealized Losses | (29,364) | (5,874)
12 Months or More, Fair Value | 314,332 | 6,818
12 Months or More, Unrealized Losses | (34,266) | (136)
Fair Value | 792,428 | 638,909
Unrealized Losses | $ (63,630) | (6,010)
State and political subdivision debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 Months, Fair Value |  | 8,430
Less Than 12 Months, Unrealized Losses |  | (104)
12 Months or More, Fair Value |  | 0
12 Months or More, Unrealized Losses |  | 0
Fair Value |  | 8,430
Unrealized Losses |  | $ (104)

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