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Investment Securities - Summary of Held-to-Maturity Securities, Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Schedule of Held-to-maturity Securities [Line Items] |  |
Fair Value, Less than 12 months |  | $ 16,978
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (109)
Fair Value, 12 months or more | $ 426,586 | 452,822
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (68,114) | (80,843)
Total Fair Value | 426,586 | 469,800
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss | (68,114) | (80,952)
U.S. Treasury securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair Value, 12 months or more | 49,157 | 48,334
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (406) | (1,004)
Total Fair Value | 49,157 | 48,334
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss | (406) | (1,004)
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair Value, Less than 12 months |  | 14,689
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (72)
Fair Value, 12 months or more | 201,590 | 217,467
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (28,386) | (34,480)
Total Fair Value | 201,590 | 232,156
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss | (28,386) | (34,552)
Other residential MBS issued or guaranteed by U.S. government agencies or sponsored enterprises |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Fair Value, Less than 12 months |  | 2,289
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | (37)
Fair Value, 12 months or more | 175,839 | 187,021
Held-to-maturity Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | (39,322) | (45,359)
Total Fair Value | 175,839 | 189,310
Held-to-maturity Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (39,322) | $ (45,396)

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