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INVESTMENT SECURITIES (Tables) | 9 Months Ended
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Sep. 30, 2025
INVESTMENT SECURITIES |
Schedule of gross amortized cost and fair value of available-for-sale debt securities and the related gross unrealized gains and losses recognized in accumulated other comprehensive income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Gross |  | Gross |  |  | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized |  | Fair
September 30, 2025 (in thousands) | ​ | Cost | ​ | Gains | ​ | Losses |  | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities and U.S. Government agencies | ​ | $ | 265,913 | ​ | $ | 109 | ​ | $ | (2,296) | ​ | $ | 263,726
Private label mortgage-backed security | ​ |  | — | ​ |  | 1,452 | ​ |  | — | ​ |  | 1,452
Mortgage-backed securities - residential | ​ |  | 560,809 | ​ |  | 2,655 | ​ |  | (8,011) | ​ |  | 555,453
Collateralized mortgage obligations | ​ |  | 18,100 | ​ |  | 24 | ​ |  | (656) | ​ |  | 17,468
Corporate bonds | ​ |  | 1,002 | ​ |  | — | ​ |  | — | ​ |  | 1,002
Trust preferred security | ​ |  | 3,910 | ​ |  | 160 | ​ |  | — | ​ |  | 4,070
Total available-for-sale debt securities | ​ | $ | 849,734 | ​ | $ | 4,400 | ​ | $ | (10,963) | ​ | $ | 843,171
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Gross |  | Gross |  |  | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized |  | Fair
December 31, 2024 (in thousands) | ​ | Cost | ​ | Gains | ​ | Losses |  | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities and U.S. Government agencies | ​ | $ | 395,609 | ​ | $ | 4 | ​ | $ | (6,527) | ​ | $ | 389,086
Private label mortgage-backed security | ​ |  | 121 | ​ |  | 1,429 | ​ |  | — | ​ |  | 1,550
Mortgage-backed securities - residential | ​ |  | 180,765 | ​ |  | 193 | ​ |  | (12,725) | ​ |  | 168,233
Collateralized mortgage obligations | ​ |  | 20,127 | ​ |  | 27 | ​ |  | (911) | ​ |  | 19,243
Corporate bonds | ​ |  | 2,008 | ​ |  | 1 | ​ |  | — | ​ |  | 2,009
Trust preferred security | ​ |  | 3,863 | ​ |  | 171 | ​ |  | — | ​ |  | 4,034
Total available-for-sale debt securities | ​ | $ | 602,493 | ​ | $ | 1,825 | ​ | $ | (20,163) | ​ | $ | 584,155
Schedule of carrying value, gross unrecognized gains and losses, and fair value of held-to-maturity debt securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  | ​ |  | Gross |  | Gross |  |  | ​
​ | ​ | Amortized | ​ | Unrecognized | ​ | Unrecognized | ​ | Fair
September 30, 2025 (in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed securities - residential | ​ | $ | 14 | ​ | $ | — | ​ | $ | — | ​ | $ | 14
Collateralized mortgage obligations | ​ |  | 5,096 | ​ |  | 31 | ​ |  | (54) | ​ |  | 5,073
Total held-to-maturity debt securities | ​ | $ | 5,110 | ​ | $ | 31 | ​ | $ | (54) | ​ | $ | 5,087
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  | ​ |  | Gross |  | Gross |  |  | ​
​ | ​ | Amortized | ​ | Unrecognized | ​ | Unrecognized | ​ | Fair
December 31, 2024 (in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed securities - residential | ​ | $ | 23 | ​ | $ | 1 | ​ | $ | — | ​ | $ | 24
Collateralized mortgage obligations | ​ |  | 5,756 | ​ |  | 36 | ​ |  | (86) | ​ |  | 5,706
Corporate bonds | ​ |  | 4,999 | ​ |  | 6 | ​ |  | — | ​ |  | 5,005
Total held-to-maturity debt securities | ​ | $ | 10,778 | ​ | $ | 43 | ​ | $ | (86) | ​ | $ | 10,735
Schedule of amortized cost and fair value of debt securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Available-for-Sale | ​ | Held-to-Maturity
​ | ​ | Debt Securities | ​ | Debt Securities
​ |  | Amortized |  | Fair |  | Amortized |  | Fair
September 30, 2025 (in thousands) | ​ | Cost | ​ | Value | ​ | Cost | ​ | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Due in one year or less | ​ | $ | 11,002 | ​ | $ | 10,780 | ​ | $ | — | ​ | $ | —
Due from one year to five years | ​ |  | 255,913 | ​ |  | 253,948 | ​ |  | — | ​ |  | —
Due from five years to ten years | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
Due beyond ten years | ​ |  | 3,910 | ​ |  | 4,070 | ​ |  | — | ​ |  | —
Private label mortgage-backed security | ​ |  | — | ​ |  | 1,452 | ​ |  | — | ​ |  | —
Mortgage-backed securities - residential | ​ |  | 560,809 | ​ |  | 555,453 | ​ |  | 14 | ​ |  | 14
Collateralized mortgage obligations | ​ |  | 18,100 | ​ |  | 17,468 | ​ |  | 5,096 | ​ |  | 5,073
Total debt securities | ​ | $ | 849,734 | ​ | $ | 843,171 | ​ | $ | 5,110 | ​ | $ | 5,087
Schedule of debt securities with unrealized losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 months | ​ | 12 months or more | ​ | Total
​ |  | ​ | ​ |  | Unrealized |  | ​ | ​ |  | Unrealized |  | ​ | ​ |  | Unrealized
September 30, 2025 (in thousands) | ​ | Fair Value | ​ | Losses | ​ | Fair Value | ​ | Losses | ​ | Fair Value | ​ | Losses
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities and U.S. Government agencies | ​ | $ | 50,939 | ​ | $ | (30) | ​ | $ | 77,717 | ​ | $ | (2,266) | ​ | $ | 128,656 | ​ | $ | (2,296)
Mortgage-backed securities - residential | ​ | ​ | 87,466 | ​ | ​ | (362) | ​ | ​ | 89,791 | ​ | ​ | (7,649) | ​ | ​ | 177,257 | ​ | ​ | (8,011)
Collateralized mortgage obligations | ​ | ​ | 664 | ​ | ​ | (1) | ​ | ​ | 14,647 | ​ | ​ | (655) | ​ | ​ | 15,311 | ​ | ​ | (656)
Total available-for-sale debt securities | ​ | $ | 139,069 | ​ | $ | (393) | ​ | $ | 182,155 | ​ | $ | (10,570) | ​ | $ | 321,224 | ​ | $ | (10,963)
​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 months | ​ | 12 months or more | ​ | Total
​ |  | ​ | ​ |  | Unrealized |  | ​ | ​ |  | Unrealized |  | ​ | ​ |  | Unrealized
December 31, 2024 (in thousands) | ​ | Fair Value | ​ | Losses | ​ | Fair Value | ​ | Losses | ​ | Fair Value | ​ | Losses
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale debt securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities and U.S. Government agencies | ​ | $ | 145,048 | ​ | $ | (212) | ​ | $ | 209,033 | ​ | $ | (6,315) | ​ | $ | 354,081 | ​ | $ | (6,527)
Mortgage-backed securities - residential | ​ | ​ | 52,347 | ​ | ​ | (874) | ​ | ​ | 104,453 | ​ | ​ | (11,851) | ​ | ​ | 156,800 | ​ | ​ | (12,725)
Collateralized mortgage obligations | ​ | ​ | 700 | ​ | ​ | (8) | ​ | ​ | 15,951 | ​ | ​ | (903) | ​ | ​ | 16,651 | ​ | ​ | (911)
Total available-for-sale debt securities | ​ | $ | 198,095 | ​ | $ | (1,094) | ​ | $ | 329,437 | ​ | $ | (19,069) | ​ | $ | 527,532 | ​ | $ | (20,163)
​ ​
Schedule of pledged investment securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of
(in thousands) |  | September 30, 2025 |  | December 31, 2024
​ | ​ | ​ | ​ | ​ | ​ | ​
Amortized cost | ​ | $ | 137,382 | ​ | $ | 205,160
Fair value | ​ |  | 135,151 | ​ |  | 199,607
Carrying amount | ​ | ​ | 135,151 | ​ | ​ | 199,607
Schedule of carrying value, gross unrealized gains and losses, and fair value of equity securities with readily determinable fair values | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Gross |  | Gross |  |  | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
September 30, 2025 (in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Freddie Mac preferred stock | ​ | $ | — | ​ | $ | 945 | ​ | $ | — | ​ | $ | 945
Total equity securities | ​ | $ | — | ​ | $ | 945 | ​ | $ | — | ​ | $ | 945
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Gross |  | Gross |  |  | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
December 31, 2024 (in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Freddie Mac preferred stock | ​ | $ | — | ​ | $ | 693 | ​ | $ | — | ​ | $ | 693
Total equity securities | ​ | $ | — | ​ | $ | 693 | ​ | $ | — | ​ | $ | 693
Schedule of equity securities with readily determinable fair values, the gross realized and unrealized gains and losses recognized | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Gains (Losses) Recognized on Equity Securities | ​
​ | ​ | Three Months Ended September 30, 2025 |  | Three Months Ended September 30, 2024 |
(in thousands) |  | Realized |  | Unrealized |  | Total |  | Realized |  | Unrealized |  | Total | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Freddie Mac preferred stock | ​ | $ | — | ​ | $ | 189 | ​ | $ | 189 | ​ | $ | — | ​ | $ | 42 | ​ | $ | 42 | ​
Total equity securities | ​ | $ | — | ​ | $ | 189 | ​ | $ | 189 | ​ | $ | — | ​ | $ | 42 | ​ | $ | 42 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Gains (Losses) Recognized on Equity Securities | ​
​ | ​ | Nine Months Ended September 30, 2025 |  | Nine Months Ended September 30, 2024 | ​
(in thousands) | ​ | Realized | ​ | Unrealized | ​ | Total | ​ | Realized | ​ | Unrealized | ​ | Total | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Freddie Mac preferred stock | ​ | $ | — | ​ | $ | 252 | ​ | $ | 252 | ​ | $ | — | ​ | $ | 65 | ​ | $ | 65 | ​
Total equity securities | ​ | $ | — | ​ | $ | 252 | ​ | $ | 252 | ​ | $ | — | ​ | $ | 65 | ​ | $ | 65 | ​
​

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