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Investment Securities - Schedule of Gross Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale [Abstract] |  |
Fair Value, Less than 12 months | $ 167,776 | $ 40,403
Gross Unrealized Loss , Less than 12 months | (2,110) | (169)
Fair Value, 12 months or more | 603,903 | 1,228,463
Gross Unrealized Loss , 12 months or more | (106,062) | (187,477)
Fair Value, Total | 771,679 | 1,268,866
Gross Unrealized Loss , Total | (108,172) | (187,646)
U.S. government agency securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Fair Value, Less than 12 months | 143,783 | 25,923
Gross Unrealized Loss , Less than 12 months | (338) | (21)
Fair Value, 12 months or more | 816 | 14,040
Gross Unrealized Loss , 12 months or more | (5) | (1,156)
Fair Value, Total | 144,599 | 39,963
Gross Unrealized Loss , Total | (343) | (1,177)
Mortgage-backed securities - residential |  |
Debt Securities, Available-for-sale [Abstract] |  |
Fair Value, Less than 12 months | 0 | 0
Gross Unrealized Loss , Less than 12 months | 0 | 0
Fair Value, 12 months or more | 470,625 | 896,971
Gross Unrealized Loss , 12 months or more | (90,176) | (160,418)
Fair Value, Total | 470,625 | 896,971
Gross Unrealized Loss , Total | (90,176) | (160,418)
Mortgage-backed securities - commercial |  |
Debt Securities, Available-for-sale [Abstract] |  |
Fair Value, Less than 12 months | 0 | 0
Gross Unrealized Loss , Less than 12 months | 0 | 0
Fair Value, 12 months or more | 16,289 | 16,961
Gross Unrealized Loss , 12 months or more | (858) | (1,225)
Fair Value, Total | 16,289 | 16,961
Gross Unrealized Loss , Total | (858) | (1,225)
Municipal securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Fair Value, Less than 12 months | 23,993 | 14,480
Gross Unrealized Loss , Less than 12 months | (1,772) | (148)
Fair Value, 12 months or more | 115,191 | 188,669
Gross Unrealized Loss , 12 months or more | (15,007) | (21,271)
Fair Value, Total | 139,184 | 203,149
Gross Unrealized Loss , Total | (16,779) | (21,419)
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Fair Value, Less than 12 months |  | 0
Gross Unrealized Loss , Less than 12 months |  | 0
Fair Value, 12 months or more |  | 108,496
Gross Unrealized Loss , 12 months or more |  | (3,233)
Fair Value, Total |  | 108,496
Gross Unrealized Loss , Total |  | (3,233)
Corporate securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Fair Value, Less than 12 months | 0 | 0
Gross Unrealized Loss , Less than 12 months | 0 | 0
Fair Value, 12 months or more | 982 | 3,326
Gross Unrealized Loss , 12 months or more | (16) | (174)
Fair Value, Total | 982 | 3,326
Gross Unrealized Loss , Total | $ (16) | $ (174)

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