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Securities (Tables) | 3 Months Ended
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Mar. 31, 2024
Securities [Abstract] |
Schedule of Available-for-sale Securities Reconciliation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2024
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
Available-for-sale: | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
U.S. Treasury | ​ | $ | 84,065 | ​ | $ | — | ​ | $ | (8,790) | ​ | $ | 75,275
U.S. Government-sponsored enterprises (GSEs) | ​ | ​ | 48,393 | ​ | ​ | 725 | ​ | ​ | (169) | ​ | ​ | 48,949
Municipal securities | ​ |  | 18,407 | ​ |  | 98 | ​ |  | (487) | ​ |  | 18,018
Other debt securities | ​ |  | 39,321 | ​ |  | 164 | ​ |  | (3,546) | ​ |  | 35,939
Mortgage-backed securities (GSEs) | ​ |  | 319,389 | ​ |  | 699 | ​ |  | (23,922) | ​ |  | 296,166
Total | ​ | $ | 509,575 | ​ | $ | 1,686 | ​ | $ | (36,914) | ​ | $ | 474,347
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
Available-for-sale: | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
U.S. Treasury | ​ | $ | 84,307 | ​ | $ | — | ​ | $ | (8,274) | ​ | $ | 76,033
U.S. Government-sponsored enterprises (GSEs) | ​ | ​ | 46,983 | ​ | ​ | 1,256 | ​ | ​ | (146) | ​ | ​ | 48,093
Municipal securities | ​ |  | 18,616 | ​ |  | 135 | ​ |  | (475) | ​ |  | 18,276
Other debt securities | ​ |  | 36,863 | ​ |  | 93 | ​ |  | (3,887) | ​ |  | 33,069
Mortgage-backed securities (GSEs) | ​ |  | 254,288 | ​ |  | 588 | ​ |  | (21,937) | ​ |  | 232,939
Total | ​ | $ | 441,057 | ​ | $ | 2,072 | ​ | $ | (34,719) | ​ | $ | 408,410
Schedule of Held-to-maturity Securities Reconciliation | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2024
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
Held-to-maturity: | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
U.S. Treasury | ​ | $ | 50,030 | ​ | $ | — | ​ | $ | (227) | ​ | $ | 49,803
U.S. Government-sponsored enterprises (GSEs) | ​ |  | 49,032 | ​ |  | — | ​ |  | (7,897) | ​ |  | 41,135
Municipal securities | ​ |  | 52,423 | ​ |  | — | ​ |  | (6,582) | ​ |  | 45,841
Mortgage-backed securities (GSEs) | ​ |  | 28,684 | ​ |  | — | ​ |  | (4,250) | ​ |  | 24,434
Total | ​ | $ | 180,169 | ​ | $ | — | ​ | $ | (18,956) | ​ | $ | 161,213
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
Held-to-maturity: | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value
U.S. Treasury | ​ | $ | 150,066 | ​ | $ | — | ​ | $ | (1,482) | ​ | $ | 148,584
U.S. Government-sponsored enterprises (GSEs) | ​ | ​ | 49,336 | ​ | ​ | — | ​ | ​ | (7,143) | ​ | ​ | 42,193
Municipal securities | ​ |  | 52,680 | ​ |  | — | ​ |  | (6,178) | ​ |  | 46,502
Mortgage-backed securities (GSEs) | ​ |  | 29,154 | ​ |  | — | ​ |  | (3,895) | ​ |  | 25,259
Total | ​ | $ | 281,236 | ​ | $ | — | ​ | $ | (18,698) | ​ | $ | 262,538
Investments Classified by Contractual Maturity Date | The amortized cost and estimated fair value of securities at March 31, 2024, by contractual maturity for non-mortgage backed securities are shown below (in thousands). Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2024
​ |  | Amortized |  | Fair
Available-for-sale: | ​ | Cost | ​ | Value
Due in one year or less | ​ | $ | 1,280 | ​ | $ | 1,274
Due from one year to five years | ​ |  | 88,430 | ​ |  | 79,446
Due from five years to ten years | ​ |  | 87,487 | ​ |  | 84,734
Due after ten years | ​ |  | 12,989 | ​ |  | 12,727
​ | ​ |  | 190,186 | ​ |  | 178,181
Mortgage-backed securities | ​ |  | 319,389 | ​ |  | 296,166
Total | ​ | $ | 509,575 | ​ | $ | 474,347
​ | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​
Due in one year or less | ​ | $ | 50,030 | ​ | $ | 49,802
Due from one year to five years | ​ |  | 745 | ​ |  | 701
Due from five years to ten years | ​ |  | 47,201 | ​ |  | 40,121
Due after ten years | ​ |  | 53,509 | ​ |  | 46,155
​ | ​ |  | 151,485 | ​ |  | 136,779
Mortgage-backed securities | ​ |  | 28,684 | ​ |  | 24,434
Total | ​ | $ | 180,169 | ​ | $ | 161,213
​
Schedule of Unrealized Loss on Investments | The following tables present the gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities AFS and HTM have been in a continuous unrealized loss position (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2024
​ | ​ | Less than 12 Months | ​ | 12 Months or Greater | ​ | Total
​ |  | ​ | ​ |  | Gross | ​ | Number |  | ​ | ​ |  | Gross | ​ | Number |  | ​ | ​ |  | Gross | ​ | Number
​ | ​ | Fair | ​ | Unrealized | ​ | of | ​ | Fair | ​ | Unrealized | ​ | of | ​ | Fair | ​ | Unrealized | ​ | of
Available-for-sale: | ​ | Value | ​ | Losses | ​ | Securities | ​ | Value | ​ | Losses | ​ | Securities | ​ | Value | ​ | Losses | ​ | Securities
U.S. Treasury | ​ | $ | — | ​ | $ | — | ​ | — | ​ | $ | 75,276 | ​ | $ | (8,790) | ​ | 9 | ​ | $ | 75,276 | ​ | $ | (8,790) | ​ | 9
U.S. Government-sponsored enterprises (GSEs) | ​ | ​ | 9,906 | ​ | ​ | (141) | ​ | 3 | ​ | ​ | 6,532 | ​ | ​ | (28) | ​ | 5 | ​ | ​ | 16,438 | ​ | ​ | (169) | ​ | 8
Municipal securities | ​ |  | 2,156 | ​ |  | (11) | ​ | 5 | ​ |  | 12,565 | ​ |  | (476) | ​ | 19 | ​ |  | 14,721 | ​ |  | (487) | ​ | 24
Other debt securities | ​ |  | 2,408 | ​ |  | (41) | ​ | 2 | ​ |  | 29,415 | ​ |  | (3,505) | ​ | 26 | ​ |  | 31,823 | ​ |  | (3,546) | ​ | 28
Mortgage-backed securities (GSEs) | ​ |  | 63,256 | ​ |  | (831) | ​ | 21 | ​ |  | 177,765 | ​ |  | (23,091) | ​ | 87 | ​ |  | 241,021 | ​ |  | (23,922) | ​ | 108
Total | ​ | $ | 77,726 | ​ | $ | (1,024) | ​ | 31 | ​ | $ | 301,553 | ​ | $ | (35,890) | ​ | 146 | ​ | $ | 379,279 | ​ | $ | (36,914) | ​ | 177
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2024
​ | ​ | Less than 12 Months | ​ | 12 Months or Greater | ​ | Total
​ |  | ​ | ​ |  | Gross | ​ | Number |  | ​ | ​ |  | Gross | ​ | Number |  | ​ | ​ |  | Gross | ​ | Number
​ | ​ | Fair | ​ | Unrealized | ​ | of | ​ | Fair | ​ | Unrealized | ​ | of | ​ | Fair | ​ | Unrealized | ​ | of
Held-to-maturity: | ​ | Value | ​ | Losses | ​ | Securities | ​ | Value | ​ | Losses | ​ | Securities | ​ | Value | ​ | Losses | ​ | Securities
U.S. Treasury | ​ | $ | — | ​ | $ | — | ​ | — | ​ | $ | 49,802 | ​ | $ | (227) | ​ | 2 | ​ | $ | 49,802 | ​ | $ | (227) | ​ | 2
U.S. Government-sponsored enterprises (GSEs) | ​ |  | — | ​ |  | — | ​ | — | ​ |  | 41,135 | ​ |  | (7,897) | ​ | 13 | ​ |  | 41,135 | ​ |  | (7,897) | ​ | 13
Municipal securities | ​ |  | — | ​ |  | — | ​ | — | ​ |  | 45,840 | ​ |  | (6,582) | ​ | 35 | ​ |  | 45,840 | ​ |  | (6,582) | ​ | 35
Mortgage-backed securities (GSEs) | ​ |  | — | ​ |  | — | ​ | — | ​ |  | 24,434 | ​ |  | (4,250) | ​ | 5 | ​ |  | 24,434 | ​ |  | (4,250) | ​ | 5
Total | ​ | $ | — | ​ | $ | — | ​ | — | ​ | $ | 161,211 | ​ | $ | (18,956) | ​ | 55 | ​ | $ | 161,211 | ​ | $ | (18,956) | ​ | 55
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | Less than 12 Months | ​ | 12 Months or Greater | ​ | Total
​ |  | ​ | ​ |  | Gross | ​ | Number |  | ​ | ​ |  | Gross | ​ | Number |  | ​ | ​ |  | Gross | ​ | Number
​ | ​ | Fair | ​ | Unrealized | ​ | of | ​ | Fair | ​ | Unrealized | ​ | of | ​ | Fair | ​ | Unrealized | ​ | of
Available-for-sale: | ​ | Value | ​ | Losses | ​ | Securities | ​ | Value | ​ | Losses | ​ | Securities | ​ | Value | ​ | Losses | ​ | Securities
U.S. Treasury | ​ | $ | — | ​ | $ | — | ​ | — | ​ | $ | 76,033 | ​ | $ | (8,274) | ​ | 9 | ​ | $ | 76,033 | ​ | $ | (8,274) | ​ | 9
U.S. Government-sponsored enterprises (GSEs) | ​ | ​ | 9,743 | ​ | ​ | (137) | ​ | 3 | ​ | ​ | 1,482 | ​ | ​ | (9) | ​ | 3 | ​ | ​ | 11,225 | ​ | ​ | (146) | ​ | 6
Municipal securities | ​ |  | 2,786 | ​ |  | (2) | ​ | 2 | ​ |  | 9,849 | ​ |  | (473) | ​ | 17 | ​ |  | 12,635 | ​ |  | (475) | ​ | 19
Other debt securities | ​ |  | 2,986 | ​ |  | (17) | ​ | 2 | ​ |  | 29,057 | ​ |  | (3,870) | ​ | 26 | ​ |  | 32,043 | ​ |  | (3,887) | ​ | 28
Mortgage-backed securities (GSEs) | ​ |  | 16,401 | ​ |  | (229) | ​ | 8 | ​ |  | 176,351 | ​ |  | (21,708) | ​ | 88 | ​ |  | 192,752 | ​ |  | (21,937) | ​ | 96
Total | ​ | $ | 31,916 | ​ | $ | (385) | ​ | 15 | ​ | $ | 292,772 | ​ | $ | (34,334) | ​ | 143 | ​ | $ | 324,688 | ​ | $ | (34,719) | ​ | 158
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | Less than 12 Months | ​ | 12 Months or Greater | ​ | Total
​ |  | ​ | ​ |  | Gross | ​ | Number |  | ​ | ​ |  | Gross | ​ | Number |  | ​ | ​ |  | Gross | ​ | Number
​ | ​ | Fair | ​ | Unrealized | ​ | of | ​ | Fair | ​ | Unrealized | ​ | of | ​ | Fair | ​ | Unrealized | ​ | of
Held-to-maturity: | ​ | Value | ​ | Losses | ​ | Securities | ​ | Value | ​ | Losses | ​ | Securities | ​ | Value | ​ | Losses | ​ | Securities
U.S. Treasury | ​ | $ | — | ​ | $ | — | ​ | — | ​ | $ | 148,584 | ​ | $ | (1,482) | ​ | 4 | ​ | $ | 148,584 | ​ | $ | (1,482) | ​ | 4
U.S. Government-sponsored enterprises (GSEs) | ​ | ​ | — | ​ | ​ | — | ​ | — | ​ | ​ | 42,194 | ​ | ​ | (7,143) | ​ | 13 | ​ | ​ | 42,194 | ​ | ​ | (7,143) | ​ | 13
Municipal securities | ​ |  | — | ​ |  | — | ​ | — | ​ |  | 46,500 | ​ |  | (6,178) | ​ | 35 | ​ |  | 46,500 | ​ |  | (6,178) | ​ | 35
Mortgage-backed securities (GSEs) | ​ |  | — | ​ |  | — | ​ | — | ​ |  | 25,258 | ​ |  | (3,895) | ​ | 5 | ​ |  | 25,258 | ​ |  | (3,895) | ​ | 5
Total | ​ | $ | — | ​ | $ | — | ​ | — | ​ | $ | 262,536 | ​ | $ | (18,698) | ​ | 57 | ​ | $ | 262,536 | ​ | $ | (18,698) | ​ | 57
​
Schedule of Other Investments | The following is the amortized cost and carrying value of other investments (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ |  | 2024 |  | 2023
Federal Reserve Bank stock | ​ | $ | 9,532 |  | $ | 9,526
Federal Home Loan Bank stock | ​ |  | 3,836 |  | ​ | 3,786
First National Bankers Bank stock | ​ |  | 350 |  | ​ | 350
Total | ​ | $ | 13,718 | ​ | $ | 13,662
​

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