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Investments in Securities - Fair value and unrealized losses on investments (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | $ 21,180 | $ 355,027
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (358) | (38,996)
Available-for-sale securities, 12 Months or More, Fair Value | 435,747 | 116,980
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (53,861) | (23,745)
Available-for-sale securities, Fair Value | 456,927 | 472,007
Available-for-sale securities, Unrealized Loss | (54,219) | (62,741)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, Less than 12 Month, Fair Value |  | 121,173
Held-to-maturity securities, Less than 12 Months, Unrealized Losses |  | (14,278)
Held-to-maturity securities, 12 Months or Longer, Fair Value | 171,193 | 56,592
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (23,830) | (10,452)
Held-to-maturity securities, Fair Value | 171,193 | 177,765
Held-to-maturity securities, Unrealized Losses | (23,830) | (24,730)
Agency mortgage-backed securities. |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 4,318 | 221,562
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (9) | (27,597)
Available-for-sale securities, 12 Months or More, Fair Value | 274,801 | 64,918
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (35,881) | (13,187)
Available-for-sale securities, Fair Value | 279,119 | 286,480
Available-for-sale securities, Unrealized Loss | (35,890) | (40,784)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, Less than 12 Month, Fair Value |  | 59,218
Held-to-maturity securities, Less than 12 Months, Unrealized Losses |  | (7,766)
Held-to-maturity securities, 12 Months or Longer, Fair Value | 66,245 | 7,868
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (8,686) | (2,054)
Held-to-maturity securities, Fair Value | 66,245 | 67,086
Held-to-maturity securities, Unrealized Losses | (8,686) | (9,820)
Agency collateralized mortgage obligations |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 9,080 | 28,537
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (216) | (3,262)
Available-for-sale securities, 12 Months or More, Fair Value | 66,866 | 40,642
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (9,827) | (8,469)
Available-for-sale securities, Fair Value | 75,946 | 69,179
Available-for-sale securities, Unrealized Loss | (10,043) | (11,731)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, Less than 12 Month, Fair Value |  | 61,055
Held-to-maturity securities, Less than 12 Months, Unrealized Losses |  | (6,411)
Held-to-maturity securities, 12 Months or Longer, Fair Value | 99,241 | 44,178
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (14,662) | (7,718)
Held-to-maturity securities, Fair Value | 99,241 | 105,233
Held-to-maturity securities, Unrealized Losses | (14,662) | (14,129)
States and political subdivisions securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value |  | 44,455
Available-for-sale Securities, Less than 12 Months, Unrealized Loss |  | (2,913)
Available-for-sale securities, 12 Months or More, Fair Value | 37,969 | 3,753
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (1,531) | (378)
Available-for-sale securities, Fair Value | 37,969 | 48,208
Available-for-sale securities, Unrealized Loss | (1,531) | (3,291)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, Less than 12 Month, Fair Value |  | 900
Held-to-maturity securities, Less than 12 Months, Unrealized Losses |  | (101)
Held-to-maturity securities, 12 Months or Longer, Fair Value | 5,707 | 4,546
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (482) | (680)
Held-to-maturity securities, Fair Value | 5,707 | 5,446
Held-to-maturity securities, Unrealized Losses | (482) | (781)
Small Business Administration securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 7,782 | 60,473
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (133) | (5,224)
Available-for-sale securities, 12 Months or More, Fair Value | 56,111 | 7,667
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (6,622) | (1,711)
Available-for-sale securities, Fair Value | 63,893 | 68,140
Available-for-sale securities, Unrealized Loss | $ (6,755) | $ (6,935)

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