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Note 2 - INVESTMENT SECURITIES (Tables) | 9 Months Ended
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Sep. 30, 2024
INVESTMENT SECURITIES |
Schedule of amortized cost and fair value of HTM and AFS investment securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Allowance |  | Gross | ​ | Gross | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | for Credit |  | Unrealized | ​ | Unrealized | ​ | Fair | ​
​ |  | Cost |  | (Losses) |  | Gains |  | (Losses) |  | Value |
​ | ​ | (dollars in thousands) | ​
September 30, 2024: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |
Securities HTM: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |
Municipal securities | ​ | $ | 794,649 | ​ | $ | (202) | ​ | $ | 34,994 | ​ | $ | (38,831) | ​ | $ | 790,610 | ​
Other securities | ​ |  | 1,050 | ​ |  | (1) | ​ |  | — | ​ |  | — | ​ |  | 1,049 | ​
​ | ​ | $ | 795,699 | ​ | $ | (203) | ​ | $ | 34,994 | ​ | $ | (38,831) | ​ | $ | 791,659 | ​
​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Securities AFS: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
U.S. govt. sponsored agency securities | ​ | $ | 20,622 | ​ | $ | — | ​ | $ | 13 | ​ | $ | (2,014) | ​ | $ | 18,621 | ​
Residential mortgage-backed and related securities | ​ |  | 57,924 | ​ |  | — | ​ |  | 5 | ​ |  | (4,442) | ​ |  | 53,487 | ​
Municipal securities | ​ |  | 204,879 | ​ |  | — | ​ |  | 5 | ​ |  | (33,722) | ​ |  | 171,162 | ​
Asset-backed securities | ​ | ​ | 10,326 | ​ | ​ | — | ​ | ​ | 129 | ​ | ​ | — | ​ | ​ | 10,455 | ​
Other securities | ​ |  | 40,715 | ​ |  | — | ​ |  | 5 | ​ |  | (2,580) | ​ |  | 38,140 | ​
​ | ​ | $ | 334,466 | ​ | $ | — | ​ | $ | 157 | ​ | $ | (42,758) | ​ | $ | 291,865 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Allowance | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | for Credit | ​ | Unrealized | ​ | Unrealized | ​ | Fair | ​
​ |  | Cost | ​ | (Losses) | ​ | Gains |  | (Losses) | ​ | Value | ​
​ | ​ | (dollars in thousands) | ​
December 31, 2023: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  | ​ | ​ | ​ |
Securities HTM: |  | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  | ​ | ​ | ​ |
Municipal securities | ​ | $ | 682,657 | ​ | $ | (202) | ​ | $ | 33,385 | ​ | $ | (36,639) | ​ | $ | 679,201 | ​
Other securities | ​ |  | 1,050 | ​ |  | (1) | ​ |  | 44 | ​ |  | (15) | ​ |  | 1,078 | ​
​ | ​ | $ | 683,707 | ​ | $ | (203) | ​ | $ | 33,429 | ​ | $ | (36,654) | ​ | $ | 680,279 | ​
​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Securities AFS: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
U.S. govt. sponsored agency securities | ​ | $ | 17,399 | ​ | $ | — | ​ | $ | 12 | ​ | $ | (2,438) | ​ | $ | 14,973 | ​
Residential mortgage-backed and related securities | ​ |  | 65,168 | ​ |  | — | ​ |  | — | ​ |  | (5,972) | ​ |  | 59,196 | ​
Municipal securities | ​ |  | 206,566 | ​ |  | — | ​ |  | 11 | ​ |  | (35,590) | ​ |  | 170,987 | ​
Asset-backed securities | ​ | ​ | 15,261 | ​ | ​ | — | ​ | ​ | 167 | ​ | ​ | (5) | ​ | ​ | 15,423 | ​
Other securities | ​ |  | 44,239 | ​ |  | (989) | ​ |  | — | ​ |  | (4,174) | ​ |  | 39,076 | ​
​ | ​ | $ | 348,633 | ​ | $ | (989) | ​ | $ | 190 | ​ | $ | (48,179) | ​ | $ | 299,655 | ​
Securities have been in a continuous unrealized loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 Months | ​ | 12 Months or More | ​ | Total
​ | ​ | ​ | ​ | Gross | ​ | ​ | ​ | Gross | ​ | ​ | ​ | Gross
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
​ |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
​ | ​ | (dollars in thousands)
September 30, 2024: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Securities HTM: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 59,350 | ​ | $ | (2,530) | ​ | $ | 274,330 | ​ | $ | (36,301) | ​ | $ | 333,680 | ​ | $ | (38,831)
​ | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. govt. sponsored agency securities | ​ | $ | — | ​ | $ | — | ​ | $ | 13,943 | ​ | $ | (2,014) | ​ | $ | 13,943 | ​ | $ | (2,014)
Residential mortgage-backed and related securities | ​ |  | 74 | ​ |  | (1) | ​ |  | 51,840 | ​ |  | (4,441) | ​ |  | 51,914 | ​ |  | (4,442)
Municipal securities | ​ |  | — | ​ |  | — | ​ |  | 170,349 | ​ |  | (33,722) | ​ |  | 170,349 | ​ |  | (33,722)
Asset-backed securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Other securities | ​ |  | — | ​ |  | — | ​ |  | 37,175 | ​ |  | (2,580) | ​ |  | 37,175 | ​ |  | (2,580)
​ | ​ | $ | 74 | ​ | $ | (1) | ​ | $ | 273,307 | ​ | $ | (42,757) | ​ | $ | 273,381 | ​ | $ | (42,758)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 12 Months | ​ | 12 Months or More | ​ | Total
​ | ​ | ​ | ​ | Gross | ​ | ​ | ​ | Gross | ​ | ​ | ​ | Gross
​ | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized
​ |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses
​ | ​ | (dollars in thousands)
December 31, 2023: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Securities HTM: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 1,320 | ​ | $ | (11) | ​ | $ | 289,891 | ​ | $ | (36,628) | ​ | $ | 291,211 | ​ | $ | (36,639)
Other securities | ​ |  | 535 | ​ |  | (15) | ​ |  | — | ​ |  | — | ​ |  | 535 | ​ |  | (15)
​ | ​ | $ | 1,855 | ​ | $ | (26) | ​ | $ | 289,891 | ​ | $ | (36,628) | ​ | $ | 291,746 | ​ | $ | (36,654)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Securities AFS: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
U.S. govt. sponsored agency securities | ​ | $ | — | ​ | $ | — | ​ | $ | 14,018 | ​ | $ | (2,438) | ​ | $ | 14,018 | ​ | $ | (2,438)
Residential mortgage-backed and related securities | ​ |  | — | ​ |  | — | ​ |  | 59,118 | ​ |  | (5,972) | ​ |  | 59,118 | ​ |  | (5,972)
Municipal securities | ​ |  | 283 | ​ |  | (2) | ​ |  | 169,876 | ​ |  | (35,588) | ​ |  | 170,159 | ​ |  | (35,590)
Asset-backed securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 3,804 | ​ | ​ | (5) | ​ | ​ | 3,804 | ​ | ​ | (5)
Other securities | ​ | ​ | 3,805 | ​ | ​ | (393) | ​ | ​ | 35,271 | ​ | ​ | (3,781) | ​ | ​ | 39,076 | ​ | ​ | (4,174)
​ | ​ | $ | 4,088 | ​ | $ | (395) | ​ | $ | 282,087 | ​ | $ | (47,784) | ​ | $ | 286,175 | ​ | $ | (48,179)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Schedule of activity in allowance for credit losses for HTM and AFS securities by major security | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Nine Months Ended | ​ | ​
​ | ​ | September 30, 2024 | ​ | September 30, 2023 | ​ | September 30, 2024 | ​ | September 30, 2023 | ​ | ​
​ | ​ | Securities HTM | ​ | Securities AFS | ​ | Securities HTM | ​ | Securities AFS | ​ | Securities HTM | ​ | ​ | Securities AFS | ​ | Securities HTM | ​ | Securities AFS | ​ | ​
​ | ​ | Municipal | ​ | Other | ​ | ​ | ​ | Corporate | ​ | Municipal | ​ | Corporate | ​ | Municipal | ​ | Other | ​ | ​ | ​ | ​ | Corporate | ​ | Municipal | ​ | Other | ​ | ​
​ |  | securities |  | securities |  | Total | ​ | securities | ​ | securities | ​ | securities | ​ | securities | ​ | Securities | ​ | Total | ​ | ​ | securities | ​ | securities |  | securities |  | ​
​ |  | (dollars in thousands) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Allowance for credit losses: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Beginning balance | ​ | $ | 202 | ​ | $ | 1 | ​ | $ | 203 | ​ | $ | — | ​ | $ | 180 | ​ | $ | 989 | ​ | $ | 202 | ​ | $ | 1 | ​ | $ | 203 | ​ | $ | 989 | ​ | $ | 180 | ​ | $ | — | ​ | ​
Reduction due to sales | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (544) | ​ | ​ | — | ​ | ​ | — | ​ | ​
Provision for credit loss expense | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (445) | ​ | ​ | — | ​ | ​ | 989 | ​ | ​
Balance, ending | ​ | $ | 202 | ​ | $ | 1 | ​ | $ | 203 | ​ | $ | — | ​ | $ | 180 | ​ | $ | 989 | ​ | $ | 202 | ​ | $ | 1 | ​ | $ | 203 | ​ | $ | — | ​ | $ | 180 | ​ | $ | 989 | ​ | ​
Schedule of realized gain (loss) on investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Three Months Ended |  | Nine Months Ended |
​ | ​ | ​ | ​ | ​ | September 30, 2024 | ​ | September 30, 2023 | ​ | September 30, 2024 | ​ | September 30, 2023 | ​
​ | ​ | ​ | ​ | ​ | ​ | (dollars in thousands) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Proceeds from sales of securities | ​ | ​ | ​ | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 30,568 | ​
Gross gains from sales of securities | ​ | ​ | ​ | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 56 | ​
Gross losses from sales of securities | ​ | ​ | ​ | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | (507) | ​
Schedule of investments classified by maturity date | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
​ | ​ | (dollars in thousands)
Securities HTM: |  | ​ |  |  | ​ |
Due in one year or less | ​ | $ | 1,857 | ​ | $ | 1,850
Due after one year through five years | ​ |  | 34,099 | ​ |  | 35,817
Due after five years | ​ |  | 759,743 | ​ |  | 753,992
​ | ​ | $ | 795,699 | ​ | $ | 791,659
Securities AFS: | ​ |  |  | ​ |  |
Due in one year or less | ​ | $ | 4,148 | ​ | $ | 4,150
Due after one year through five years | ​ |  | 19,034 | ​ |  | 18,099
Due after five years | ​ |  | 243,034 | ​ |  | 205,674
​ | ​ | ​ | 266,216 | ​ | ​ | 227,923
Residential mortgage-backed and related securities | ​ | ​ | 57,924 | ​ | ​ | 53,487
Asset-backed securities | ​ |  | 10,326 | ​ |  | 10,455
​ | ​ | $ | 334,466 | ​ | $ | 291,865
Schedule of investment in callable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
​ | ​ | (dollars in thousands)
Securities HTM: |  | ​ |  |  | ​ |
Municipal securities | ​ | $ | 298,861 | ​ | $ | 301,521
​ | ​ |  |  | ​ |  |
Securities AFS: | ​ |  |  | ​ |  |
Municipal securities | ​ | ​ | 204,450 | ​ | ​ | 170,745
Other securities | ​ |  | 39,755 | ​ |  | 37,175
​ | ​ | $ | 244,205 | ​ | $ | 207,920

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