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Investments in Securities - Fair value and unrealized losses on investments (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | $ 118,449 | $ 21,180
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (2,511) | (358)
Available-for-sale securities, 12 Months or More, Fair Value | 405,484 | 435,747
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (58,818) | (53,861)
Available-for-sale securities, Fair Value | 523,933 | 456,927
Available-for-sale securities, Unrealized Loss | (61,329) | (54,219)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 162,765 | 171,193
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (24,668) | (23,830)
Held-to-maturity securities, Fair Value | 162,765 | 171,193
Held-to-maturity securities, Unrealized Losses | (24,668) | (23,830)
Agency mortgage-backed securities. |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 45,977 | 4,318
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (1,008) | (9)
Available-for-sale securities, 12 Months or More, Fair Value | 253,971 | 274,801
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (39,866) | (35,881)
Available-for-sale securities, Fair Value | 299,948 | 279,119
Available-for-sale securities, Unrealized Loss | (40,874) | (35,890)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 64,406 | 66,245
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (8,523) | (8,686)
Held-to-maturity securities, Fair Value | 64,406 | 66,245
Held-to-maturity securities, Unrealized Losses | (8,523) | (8,686)
Agency collateralized mortgage obligations |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 50,720 | 9,080
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (890) | (216)
Available-for-sale securities, 12 Months or More, Fair Value | 62,903 | 66,866
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (8,881) | (9,827)
Available-for-sale securities, Fair Value | 113,623 | 75,946
Available-for-sale securities, Unrealized Loss | (9,771) | (10,043)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 92,858 | 99,241
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (15,495) | (14,662)
Held-to-maturity securities, Fair Value | 92,858 | 99,241
Held-to-maturity securities, Unrealized Losses | (15,495) | (14,662)
States and political subdivisions securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 14,523 |
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (343) |
Available-for-sale securities, 12 Months or More, Fair Value | 37,945 | 37,969
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (2,386) | (1,531)
Available-for-sale securities, Fair Value | 52,468 | 37,969
Available-for-sale securities, Unrealized Loss | (2,729) | (1,531)
HELD-TO-MATURITY SECURITIES: |  |
Held-to-maturity securities, 12 Months or Longer, Fair Value | 5,501 | 5,707
Held-to-maturity securities, 12 Months or Longer, Unrealized Losses | (650) | (482)
Held-to-maturity securities, Fair Value | 5,501 | 5,707
Held-to-maturity securities, Unrealized Losses | (650) | (482)
Small Business Administration securities |  |
AVAILABLE-FOR-SALE SECURITIES: |  |
Available-for-sale securities, Less than 12 Months, Fair Value | 7,229 | 7,782
Available-for-sale Securities, Less than 12 Months, Unrealized Loss | (270) | (133)
Available-for-sale securities, 12 Months or More, Fair Value | 50,665 | 56,111
Available-for-sale Securities,12 Months or Longer, Unrealized Loss | (7,685) | (6,622)
Available-for-sale securities, Fair Value | 57,894 | 63,893
Available-for-sale securities, Unrealized Loss | $ (7,955) | $ (6,755)

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