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Investment Securities - Gross Unrealized Losses on Available-for-sale Securities and the Related Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | $ 52,701 | $ 318,639
Less than 12 months, unrealized losses | (784) | (9,576)
More than 12 months, fair value | 592,403 | 342,354
More than 12 months, unrealized losses | (36,330) | (32,550)
Fair Value | 645,104 | 660,993
Unrealized Losses | (37,114) | (42,126)
U.S. Treasury and government sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | 42,827 | 282,319
Less than 12 months, unrealized losses | (658) | (8,876)
More than 12 months, fair value | 535,809 | 302,840
More than 12 months, unrealized losses | (34,922) | (30,546)
Fair Value | 578,636 | 585,159
Unrealized Losses | (35,580) | (39,422)
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | 0 | 13,216
Less than 12 months, unrealized losses | 0 | (43)
More than 12 months, fair value | 6,431 | 4,394
More than 12 months, unrealized losses | (587) | (631)
Fair Value | 6,431 | 17,610
Unrealized Losses | (587) | (674)
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | 9,874 | 22,309
Less than 12 months, unrealized losses | (126) | (632)
More than 12 months, fair value | 49,354 | 35,120
More than 12 months, unrealized losses | (810) | (1,373)
Fair Value | 59,228 | 57,429
Unrealized Losses | (936) | (2,005)
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months, fair value | 0 | 795
Less than 12 months, unrealized losses | 0 | (25)
More than 12 months, fair value | 809 | 0
More than 12 months, unrealized losses | (11) | 0
Fair Value | 809 | 795
Unrealized Losses | $ (11) | $ (25)

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