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INVESTMENT SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2023
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 |  | Allowance |  |  | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | for |  | Fair
December 31, 2023 (in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Credit Losses |  | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities and U.S. Government agencies | ​ | $ | 421,576 | ​ | $ | — | ​ | $ | (14,543) | ​ | $ | — | ​ | $ | 407,033
Private label mortgage-backed security | ​ |  | 443 | ​ |  | 1,330 | ​ |  | — | ​ |  | — | ​ |  | 1,773
Mortgage-backed securities - residential | ​ |  | 167,996 | ​ |  | 176 | ​ |  | (13,462) | ​ |  | — | ​ |  | 154,710
Collateralized mortgage obligations | ​ |  | 22,698 | ​ |  | 36 | ​ |  | (1,075) | ​ |  | — | ​ |  | 21,659
Corporate bonds | ​ |  | 2,012 | ​ |  | 8 | ​ |  | — | ​ |  | — | ​ |  | 2,020
Trust preferred security | ​ |  | 3,800 | ​ |  | 318 | ​ |  | — | ​ |  | — | ​ |  | 4,118
Total available-for-sale debt securities | ​ | $ | 618,525 | ​ | $ | 1,868 | ​ | $ | (29,080) | ​ | $ | — | ​ | $ | 591,313
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Gross |  | Gross |  | Allowance |  |  | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | for |  | Fair
December 31, 2022 (in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Credit Losses |  | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities and U.S. Government agencies | ​ | $ | 436,333 | ​ | $ | 1 | ​ | $ | (25,193) | ​ | $ | — | ​ | $ | 411,141
Private label mortgage-backed security | ​ |  | 843 | ​ |  | 1,284 | ​ |  | — | ​ |  | — | ​ |  | 2,127
Mortgage-backed securities - residential | ​ |  | 189,312 | ​ |  | 16 | ​ |  | (17,455) | ​ |  | — | ​ |  | 171,873
Collateralized mortgage obligations | ​ |  | 22,774 | ​ |  | 21 | ​ |  | (1,427) | ​ |  | — | ​ |  | 21,368
Corporate bonds | ​ |  | 10,000 | ​ |  | 1 | ​ |  | — | ​ |  | — | ​ |  | 10,001
Trust preferred security | ​ |  | 3,741 | ​ |  | 114 | ​ |  | — | ​ |  | — | ​ |  | 3,855
Total available-for-sale debt securities | ​ | $ | 663,003 | ​ | $ | 1,437 | ​ | $ | (44,075) | ​ | $ | — | ​ | $ | 620,365
Schedule of carrying value, gross unrecognized gains and losses, and fair value of held-to-maturity debt securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  | ​ |  | Gross |  | Gross |  |  | ​ |  | Allowance
​ | ​ | Amortized | ​ | Unrecognized | ​ | Unrecognized | ​ | Fair | ​ | for
December 31, 2023 (in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value | ​ | Credit Losses
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities and U.S. Government agencies | ​ | $ | 65,000 | ​ | $ | — | ​ | $ | (163) | ​ | $ | 64,837 | ​ | $ | —
Mortgage-backed securities - residential | ​ | ​ | 25 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 25 | ​ | ​ | —
Collateralized mortgage obligations | ​ |  | 6,386 | ​ |  | 48 | ​ |  | (121) | ​ |  | 6,313 | ​ |  | —
Corporate bonds | ​ |  | 4,986 | ​ |  | 6 | ​ |  | — | ​ |  | 4,992 | ​ |  | (10)
Obligations of state and political subdivisions | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Total held-to-maturity debt securities | ​ | $ | 76,397 | ​ | $ | 54 | ​ | $ | (284) | ​ | $ | 76,167 | ​ | $ | (10)
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  | ​ |  | Gross |  | Gross |  |  | ​ |  | Allowance
​ | ​ | Amortized | ​ | Unrecognized | ​ | Unrecognized | ​ | Fair | ​ | for
December 31, 2022 (in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value | ​ | Credit Losses
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities and U.S. Government agencies | ​ | $ | 75,000 | ​ | $ | 106 | ​ | $ | — | ​ | $ | 75,106 | ​ | $ | —
Mortgage-backed securities - residential | ​ | ​ | 27 | ​ | ​ | — | ​ | ​ | (1) | ​ | ​ | 26 | ​ | ​ | —
Collateralized mortgage obligations | ​ |  | 7,270 | ​ |  | 54 | ​ |  | (148) | ​ |  | 7,176 | ​ |  | —
Corporate bonds | ​ |  | 4,974 | ​ |  | — | ​ |  | (49) | ​ |  | 4,925 | ​ |  | (10)
Obligations of state and political subdivisions | ​ | ​ | 125 | ​ | ​ | — | ​ | ​ | (1) | ​ | ​ | 124 | ​ | ​ | —
Total held-to-maturity debt securities | ​ | $ | 87,396 | ​ | $ | 160 | ​ | $ | (199) | ​ | $ | 87,357 | ​ | $ | (10)
​ ​
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
December 31, 2023 (in thousands) | ​ | Cost | ​ | Value | ​ | Cost | ​ | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Due in one year or less | ​ | $ | 189,872 | ​ | $ | 187,479 | ​ | $ | 50,000 | ​ | $ | 49,876
Due from one year to five years | ​ |  | 233,716 | ​ |  | 221,574 | ​ |  | 19,986 | ​ |  | 19,953
Due from five years to ten years | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
Due beyond ten years | ​ |  | 3,800 | ​ |  | 4,118 | ​ |  | — | ​ |  | —
Private label mortgage-backed security | ​ |  | 443 | ​ |  | 1,773 | ​ |  | — | ​ |  | —
Mortgage-backed securities - residential | ​ |  | 167,996 | ​ |  | 154,710 | ​ |  | 25 | ​ |  | 25
Collateralized mortgage obligations | ​ |  | 22,698 | ​ |  | 21,659 | ​ |  | 6,386 | ​ |  | 6,313
Total debt securities | ​ | $ | 618,525 | ​ | $ | 591,313 | ​ | $ | 76,397 | ​ | $ | 76,167
Schedule of debt securities with unrealized losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 months | ​ | 12 months or more | ​ | Total |
​ |  | ​ | ​ |  | Unrealized |  | ​ | ​ |  | Unrealized |  | ​ | ​ |  | Unrealized |
December 31, 2023 (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 | ​ | $ | 26,707 | ​ | $ | (84) | ​ | $ | 380,326 | ​ | $ | (14,459) | ​ | $ | 407,033 | ​ | $ | (14,543) | ​
Mortgage-backed securities - residential | ​ | ​ | 1,911 | ​ | ​ | (23) | ​ | ​ | 136,180 | ​ | ​ | (13,439) | ​ | ​ | 138,091 | ​ | ​ | (13,462) | ​
Collateralized mortgage obligations | ​ | ​ | 1,668 | ​ | ​ | (52) | ​ | ​ | 17,239 | ​ | ​ | (1,023) | ​ | ​ | 18,907 | ​ | ​ | (1,075) | ​
Trust preferred security | ​ |  | — | ​ | ​ | — | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | — | ​
Total available-for-sale debt securities | ​ | $ | 30,286 | ​ | $ | (159) | ​ | $ | 533,745 | ​ | $ | (28,921) | ​ | $ | 564,031 | ​ | $ | (29,080) | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 months | ​ | 12 months or more | ​ | Total |
​ |  | ​ | ​ |  | Unrealized |  | ​ | ​ |  | Unrealized |  | ​ | ​ |  | Unrealized |
December 31, 2022 (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 | ​ | $ | 229,372 | ​ | $ | (7,139) | ​ | $ | 171,676 | ​ | $ | (18,054) | ​ | $ | 401,048 | ​ | $ | (25,193) | ​
Mortgage-backed securities - residential | ​ | ​ | 105,274 | ​ | ​ | (7,434) | ​ | ​ | 65,520 | ​ | ​ | (10,021) | ​ | ​ | 170,794 | ​ | ​ | (17,455) | ​
Collateralized mortgage obligations | ​ | ​ | 20,418 | ​ | ​ | (1,426) | ​ | ​ | 6 | ​ | ​ | (1) | ​ | ​ | 20,424 | ​ | ​ | (1,427) | ​
Total available-for-sale debt securities | ​ | $ | 355,064 | ​ | $ | (15,999) | ​ | $ | 237,202 | ​ | $ | (28,076) | ​ | $ | 592,266 | ​ | $ | (44,075) | ​
Rollforward of the private label mortgage backed security credit losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Years Ended December 31, (in thousands) |  | 2023 |  | 2022 |  | 2021
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance, beginning of period | ​ | $ | 1,462 | ​ | $ | 1,462 | ​ | $ | 1,462
Recovery of losses previously recorded | ​ |  | — | ​ |  | — | ​ |  | —
Balance, end of period | ​ | $ | 1,462 | ​ | $ | 1,462 | ​ | $ | 1,462
Schedule of allowance for credit losses on investment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ACLS Roll-forward
​ | ​ | ​ | Years Ended December 31,
​ | ​ | ​ | 2023 | ​ | 2022
​ | ​ | ​ | Beginning | ​ | ​ | ​ | Charge- | ​ | ​ | ​ | Ending | ​ | Beginning | ​ | ​ | ​ | Charge- | ​ | ​ | ​ | Ending
(in thousands) | ​ | ​ | Balance | ​ | Provision | ​ | offs | ​ | Recoveries | ​ | Balance | ​ | Balance | ​ | Provision | ​ | offs | ​ | Recoveries | ​ | Balance
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-Sale Securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate Bonds | ​ | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Held-to-Maturity Securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate Bonds | ​ | ​ | ​ | 10 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 10 | ​ | ​ | 47 | ​ | ​ | (37) | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 10
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total | ​ | ​ | $ | 10 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 10 | ​ | $ | 47 | ​ | $ | (37) | ​ | $ | — | ​ | $ | — | ​ | $ | 10
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of pledged investment securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Years Ended December 31, (in thousands) |  |  | 2023 |  | 2022 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortized cost | ​ | ​ | $ | 106,169 | ​ | $ | 236,047 | ​
Fair value | ​ | ​ |  | 99,530 | ​ |  | 217,562 | ​
Carrying amount | ​ | ​ | ​ | 99,530 | ​ | ​ | 217,562 | ​
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 |
December 31, 2023 (in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Freddie Mac preferred stock | ​ | $ | — | ​ | $ | 174 | ​ | $ | — | ​ | $ | 174 | ​
Total equity securities with readily determinable fair values | ​ | $ | — | ​ | $ | 174 | ​ | $ | — | ​ | $ | 174 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Gross |  | Gross |  |  | ​ |
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair |
December 31, 2022 (in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Freddie Mac preferred stock | ​ | $ | — | ​ | $ | 111 | ​ | $ | — | ​ | $ | 111 | ​
Total equity securities with readily determinable fair values | ​ | $ | — | ​ | $ | 111 | ​ | $ | — | ​ | $ | 111 | ​
Schedule of equity securities with readily determinable fair values, the gross realized and unrealized gains and losses recognized in the Company's consolidated statements of income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Gains (Losses) Recognized on Equity Securities | ​
​ | ​ | Year Ended December 31, 2023 |  | Year Ended December 31, 2022 | ​
Years Ended December 31, (in thousands) | ​ | Realized | ​ | Unrealized | ​ | Total | ​ | Realized | ​ | Unrealized | ​ | Total | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Freddie Mac preferred stock | ​ | $ | — | ​ | $ | 63 | ​ | $ | 63 | ​ | $ | — | ​ | $ | (59) | ​ | $ | (59) | ​
Community Reinvestment Act mutual fund | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (204) | ​ |  | — | ​ |  | (204) | ​
Total equity securities with readily determinable fair value | ​ | $ | — | ​ | $ | 63 | ​ | $ | 63 | ​ | $ | (204) | ​ | $ | (59) | ​ | $ | (263) | ​
​

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