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INVESTMENT SECURITIES (Tables) | 6 Months Ended
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Jun. 30, 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
June 30, 2023 (in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Credit Losses |  | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities and U.S. Government agencies | ​ | $ | 431,450 | ​ | $ | — | ​ | $ | (24,093) | ​ | $ | — | ​ | $ | 407,357
Private label mortgage-backed security | ​ |  | 671 | ​ |  | 1,317 | ​ |  | — | ​ |  | — | ​ |  | 1,988
Mortgage-backed securities - residential | ​ |  | 183,843 | ​ |  | 13 | ​ |  | (17,569) | ​ |  | — | ​ |  | 166,287
Collateralized mortgage obligations | ​ |  | 24,222 | ​ |  | 30 | ​ |  | (1,505) | ​ |  | — | ​ |  | 22,747
Corporate bonds | ​ |  | 2,012 | ​ |  | 13 | ​ |  | — | ​ |  | — | ​ |  | 2,025
Trust preferred security | ​ |  | 3,770 | ​ |  | — | ​ |  | (24) | ​ |  | — | ​ |  | 3,746
Total available-for-sale debt securities | ​ | $ | 645,968 | ​ | $ | 1,373 | ​ | $ | (43,191) | ​ | $ | — | ​ | $ | 604,150
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | 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
June 30, 2023 (in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value | ​ | Credit Losses
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury securities and U.S. Government agencies | ​ | $ | 90,000 | ​ | $ | — | ​ | $ | (725) | ​ | $ | 89,275 | ​ | $ | —
Mortgage-backed securities - residential | ​ | ​ | 26 | ​ | ​ | — | ​ | ​ | (1) | ​ | ​ | 25 | ​ | ​ | —
Collateralized mortgage obligations | ​ |  | 6,845 | ​ |  | 50 | ​ |  | (134) | ​ |  | 6,761 | ​ |  | —
Corporate bonds | ​ |  | 4,980 | ​ |  | 25 | ​ |  | — | ​ |  | 5,005 | ​ |  | (10)
Obligations of state and political subdivisions | ​ | ​ | 125 | ​ | ​ | — | ​ | ​ | (1) | ​ | ​ | 124 | ​ | ​ | —
Total held-to-maturity debt securities | ​ | $ | 101,976 | ​ | $ | 75 | ​ | $ | (861) | ​ | $ | 101,190 | ​ | $ | (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
June 30, 2023 (in thousands) | ​ | Cost | ​ | Value | ​ | Cost | ​ | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Due in one year or less | ​ | $ | 139,768 | ​ | $ | 136,180 | ​ | $ | 125 | ​ | $ | 125
Due from one year to five years | ​ |  | 293,694 | ​ |  | 273,202 | ​ |  | 94,980 | ​ |  | 94,279
Due from five years to ten years | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
Due beyond ten years | ​ |  | 3,770 | ​ |  | 3,746 | ​ |  | — | ​ |  | —
Private label mortgage-backed security | ​ |  | 671 | ​ |  | 1,988 | ​ |  | — | ​ |  | —
Mortgage-backed securities - residential | ​ |  | 183,843 | ​ |  | 166,287 | ​ |  | 26 | ​ |  | 25
Collateralized mortgage obligations | ​ |  | 24,222 | ​ |  | 22,747 | ​ |  | 6,845 | ​ |  | 6,761
Total debt securities | ​ | $ | 645,968 | ​ | $ | 604,150 | ​ | $ | 101,976 | ​ | $ | 101,190
Schedule of debt securities with unrealized losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 months | ​ | 12 months or more | ​ | Total |
​ |  | ​ | ​ |  | Unrealized |  | ​ | ​ |  | Unrealized |  | ​ | ​ |  | Unrealized |
June 30, 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 | ​ | $ | 218,670 | ​ | $ | (7,852) | ​ | $ | 188,687 | ​ | $ | (16,241) | ​ | $ | 407,357 | ​ | $ | (24,093) | ​
Mortgage-backed securities - residential | ​ | ​ | 63,616 | ​ | ​ | (6,546) | ​ | ​ | 101,546 | ​ | ​ | (11,023) | ​ | ​ | 165,162 | ​ | ​ | (17,569) | ​
Collateralized mortgage obligations | ​ | ​ | 8,551 | ​ | ​ | (525) | ​ | ​ | 12,550 | ​ | ​ | (980) | ​ | ​ | 21,101 | ​ | ​ | (1,505) | ​
Trust preferred security | ​ |  | 3,746 | ​ |  | (24) | ​ |  | — | ​ |  | — | ​ |  | 3,746 | ​ |  | (24) | ​
Total available-for-sale debt securities | ​ | $ | 294,583 | ​ | $ | (14,947) | ​ | $ | 302,783 | ​ | $ | (28,244) | ​ | $ | 597,366 | ​ | $ | (43,191) | ​
​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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) | ​
​ ​
Schedule of allowance for credit losses on investment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ACLS Roll-forward
​ | ​ | ​ | Three Months Ended June 30,
​ | ​ | ​ | 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 | ​ | ​ | $ | 3 | ​ | $ | (3) | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 30 | ​ | $ | — | ​ | $ | — | ​ | $ | 30
Held-to-Maturity Securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate Bonds | ​ | ​ | ​ | 10 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 10 | ​ | ​ | 40 | ​ | ​ | 10 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 50
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total | ​ | ​ | $ | 13 | ​ | $ | (3) | ​ | $ | — | ​ | $ | — | ​ | $ | 10 | ​ | $ | 40 | ​ | $ | 40 | ​ | $ | — | ​ | $ | — | ​ | $ | 80
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ACLS Roll-forward
​ | ​ | ​ | Six Months Ended June 30,
​ | ​ | ​ | 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 | ​ | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 30 | ​ | $ | — | ​ | $ | — | ​ | $ | 30
Held-to-Maturity Securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate Bonds | ​ | ​ | ​ | 10 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 10 | ​ | ​ | 47 | ​ | ​ | 3 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 50
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total | ​ | ​ | $ | 10 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 10 | ​ | $ | 47 | ​ | $ | 33 | ​ | $ | — | ​ | $ | — | ​ | $ | 80
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of pledged investment securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | June 30, 2023 |  | December 31, 2022 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amortized cost | ​ | $ | 97,400 | ​ | $ | 236,047 | ​
Fair value | ​ |  | 92,450 | ​ |  | 217,562 | ​
Carrying amount | ​ | ​ | 92,450 | ​ | ​ | 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 |
June 30, 2023 (in thousands) | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Freddie Mac preferred stock | ​ | $ | — | ​ | $ | 122 | ​ | $ | — | ​ | $ | 122 | ​
Total equity securities with readily determinable fair values | ​ | $ | — | ​ | $ | 122 | ​ | $ | — | ​ | $ | 122 | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | 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 | ​
​ | ​ | Three Months Ended June 30, 2023 |  | Three Months Ended June 30, 2022 |
(in thousands) |  | Realized |  | Unrealized |  | Total |  | Realized |  | Unrealized |  | Total | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Freddie Mac preferred stock | ​ | $ | — | ​ | $ | 15 | ​ | $ | 15 | ​ | $ | — | ​ | $ | 25 | ​ | $ | 25 | ​
Community Reinvestment Act mutual fund | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (97) | ​ |  | — | ​ |  | (97) | ​
Total equity securities with readily determinable fair value | ​ | $ | — | ​ | $ | 15 | ​ | $ | 15 | ​ | $ | (97) | ​ | $ | 25 | ​ | $ | (72) | ​
​ ​ ​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Gains (Losses) Recognized on Equity Securities | ​
​ | ​ | Six Months Ended June 30, 2023 |  | Six Months Ended June 30, 2022 | ​
(in thousands) | ​ | Realized | ​ | Unrealized | ​ | Total | ​ | Realized | ​ | Unrealized | ​ | Total | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Freddie Mac preferred stock | ​ | $ | — | ​ | $ | 10 | ​ | $ | 10 | ​ | $ | — | ​ | $ | 19 | ​ | $ | 19 | ​
Community Reinvestment Act mutual fund | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (209) | ​ |  | — | ​ |  | (209) | ​
Total equity securities with readily determinable fair value | ​ | $ | — | ​ | $ | 10 | ​ | $ | 10 | ​ | $ | (209) | ​ | $ | 19 | ​ | $ | (190) | ​

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