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Investment Securities | 3 Months Ended
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Mar. 31, 2024
Investment Securities |
Investment Securities | ​ ​ NOTE 3 Investment Securities Trading securities are reported on the Company’s consolidated balance sheet at fair value. As of March 31, 2024, the fair value of the Company’s trading securities was $4.6 million. There were no trading securities as of December 31, 2023. Changes in fair value of trading securities are recorded in other noninterest income on the Company’s consolidated statements of income. These securities are held in a rabbi trust account and invested in mutual funds. The trading securities will be used for future payments associated with the Company’s deferred compensation plan for eligible employees, executives, and directors. The following tables present amortized cost, gross unrealized gains and losses, allowance for credit losses, or ACL, and fair value of the available-for-sale, or AFS, investment securities and the amortized cost, gross unrealized gains and losses and fair value of held-to-maturity, or HTM, securities as of March 31, 2024 and December 31, 2023: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 2024
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Allowance for | ​ | Fair
(dollars in thousands) |  | Cost | ​ | Gains | ​ | Losses | ​ | Credit Losses |  | Value
Available-for-sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury and agencies | ​ | $ | 839 | ​ | $ | 2 | ​ | $ | (3) | ​ | $ | — | ​ | $ | 838
Mortgage backed securities | ​ |  |  | ​ |  | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ |  | ​
Residential agency | ​ |  | 513,409 | ​ |  | — | ​ |  | (92,516) | ​ | ​ | — | ​ |  | 420,893
Commercial | ​ |  | 1,471 | ​ |  | — | ​ |  | (120) | ​ | ​ | — | ​ |  | 1,351
Asset backed securities | ​ |  | 23 | ​ |  | — | ​ |  | (1) | ​ | ​ | — | ​ |  | 22
Corporate bonds | ​ |  | 57,991 | ​ |  | — | ​ |  | (8,823) | ​ | ​ | — | ​ |  | 49,168
Total available-for-sale investment securities | ​ | ​ | 573,733 | ​ | ​ | 2 | ​ | ​ | (101,463) | ​ | ​ | — | ​ | ​ | 472,272
Held-to-maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Obligations of state and political agencies | ​ | ​ | 124,971 | ​ |  | — | ​ |  | (12,985) | ​ | ​ | 110 | ​ |  | 111,986
Mortgage backed securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential agency | ​ | ​ | 167,168 | ​ |  | — | ​ |  | (29,347) | ​ | ​ | 97 | ​ |  | 137,821
Total held-to-maturity investment securities | ​ | ​ | 292,139 | ​ | ​ | — | ​ | ​ | (42,332) | ​ | ​ | 207 | ​ | ​ | 249,807
Total investment securities | ​ | $ | 865,872 | ​ | $ | 2 | ​ | $ | (143,795) | ​ | $ | 207 | ​ | $ | 722,079
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Allowance for | ​ | Fair
(dollars in thousands) |  | Cost | ​ | Gains | ​ | Losses | ​ | Credit Losses |  | Value
Available-for-sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury and agencies | ​ | $ | 1,119 | ​ | $ | 4 | ​ | $ | (3) | ​ | ​ | — | ​ | $ | 1,120
Mortgage backed securities | ​ |  |  | ​ |  | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ |  |
Residential agency | ​ |  | 524,140 | ​ |  | 1 | ​ |  | (88,547) | ​ | ​ | — | ​ |  | 435,594
Commercial | ​ |  | 1,476 | ​ |  | — | ​ |  | (123) | ​ | ​ | — | ​ |  | 1,353
Asset backed securities | ​ |  | 26 | ​ |  | — | ​ |  | (1) | ​ | ​ | — | ​ |  | 25
Corporate bonds | ​ |  | 57,993 | ​ |  | — | ​ |  | (9,349) | ​ | ​ | — | ​ |  | 48,644
Total available-for-sale investment securities | ​ | ​ | 584,754 | ​ | ​ | 5 | ​ | ​ | (98,023) | ​ | ​ | — | ​ | ​ | 486,736
Held-to-maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Obligations of state and political agencies | ​ | ​ | 129,603 | ​ |  | — | ​ |  | (12,613) | ​ | ​ | 114 | ​ | ​ | 116,990
Mortgage backed securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential agency | ​ | ​ | 170,125 | ​ |  | — | ​ |  | (28,498) | ​ | ​ | 99 | ​ | ​ | 141,627
Total held-to-maturity investment securities | ​ | ​ | 299,728 | ​ | ​ | — | ​ | ​ | (41,111) | ​ | ​ | 213 | ​ | ​ | 258,617
Total investment securities | ​ | $ | 884,482 | ​ | $ | 5 | ​ | $ | (139,134) | ​ | $ | 213 | ​ | $ | 745,353
​ ​ The adequacy of the ACL on investment securities is assessed at the end of each quarter. The Company does not believe that the AFS debt securities that were in an unrealized loss position as of March 31, 2024, represent a credit loss impairment. As of March 31, 2024 and December 31, 2023, the gross unrealized loss positions were primarily related to mortgage-backed securities issued by U.S. government agencies or U.S. government-sponsored enterprises. These securities carry the explicit and/or implicit guarantee of the U.S. government, are widely recognized as “risk free,” and have a long history of zero credit loss. Additionally, there were corporate bonds in gross unrealized loss positions; however, all bonds had an investment grade rating as of March 31, 2024 and December 31, 2023. Total gross unrealized losses were attributable to changes in interest rates, relative to when the investment securities were purchased, and not due to the credit quality of the investment securities. The Company does not intend to sell the investment securities that were in an unrealized loss position and it is not more likely than not that the Company will be required to sell the investment securities before recovery of their amortized cost basis, which may be at maturity. ​ The ACL on HTM debt securities is estimated using relevant information, from internal and external sources, relating to past events, current conditions, and reasonable supportable forecasts. Using a probability of default and loss on given default analysis, the ACL on HTM debt securities was $207 thousand and $213 thousand as of March 31, 2024 and December 31, 2023, respectively. ​ Accrued interest receivable on AFS investment securities and HTM investment securities is recorded in accrued interest receivable and is excluded from the estimate of credit losses. As of March 31, 2024, the accrued interest receivable on AFS investment securities and HTM investment securities totaled $1.6 million and $1.0 million, respectively. As of December 31, 2023, the accrued interest receivable on available-for-sale investment securities and held-to-maturity investment securities totaled $1.5 million and $1.4 million, respectively. The Company had no sales or calls of AFS investment securities for the three months ended March 31, 2024 and 2023. The Company had no sales of HTM investment securities for the three months ended March 31, 2024 and 2023. The following table presents investment securities with gross unrealized losses, for which an ACL has not been recorded at March 31, 2024 and December 31, 2023, aggregated by investment category and length of time that individual investment securities have been in a continuous loss position: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | March 31, 2024
​ | ​ | ​ | ​ | Less than 12 Months | ​ | Over 12 Months | ​ | Total
​ | ​ | Number of | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair
(dollars in thousands) |  | Holdings | ​ | Losses |  | Value |  | Losses |  | Value |  | Losses |  | Value
Available-for-sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury and agencies | ​ | 1 | ​ | $ | (3) | ​ | $ | 454 | ​ | $ | — | ​ | $ | — | ​ | $ | (3) | ​ | $ | 454
Mortgage backed securities | ​ | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Residential agency | ​ | 111 | ​ |  | — | ​ |  | 35 | ​ |  | (92,516) | ​ |  | 420,815 | ​ |  | (92,516) | ​ |  | 420,850
Commercial | ​ | 1 | ​ |  | — | ​ |  | — | ​ |  | (120) | ​ |  | 1,351 | ​ |  | (120) | ​ |  | 1,351
Asset backed securities | ​ | 3 | ​ |  | — | ​ |  | — | ​ |  | (1) | ​ |  | 22 | ​ |  | (1) | ​ |  | 22
Corporate bonds | ​ | 12 | ​ |  | — | ​ |  | — | ​ |  | (8,823) | ​ |  | 49,168 | ​ |  | (8,823) | ​ |  | 49,168
Total available-for-sale investment securities | ​ | 128 | ​ | $ | (3) | ​ | $ | 489 | ​ | $ | (101,460) | ​ | $ | 471,356 | ​ | $ | (101,463) | ​ | $ | 471,845
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | December 31, 2023
​ | ​ | ​ | ​ | Less than 12 Months | ​ | Over 12 Months | ​ | Total
​ | ​ | Number of | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair
(dollars in thousands) |  | Holdings | ​ | Losses |  | Value |  | Losses |  | Value |  | Losses |  | Value
Available-for-sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury and agencies | ​ | 1 | ​ | $ | (3) | ​ | $ | 489 | ​ | $ | — | ​ | $ | — | ​ | $ | (3) | ​ | $ | 489
Mortgage backed securities | ​ | ​ | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Residential agency | ​ | 112 | ​ |  | — | ​ |  | 43 | ​ |  | (88,547) | ​ |  | 435,505 | ​ |  | (88,547) | ​ |  | 435,548
Commercial | ​ | 1 | ​ |  | — | ​ |  | — | ​ |  | (123) | ​ |  | 1,353 | ​ |  | (123) | ​ |  | 1,353
Asset backed securities | ​ | 3 | ​ |  | — | ​ |  | — | ​ |  | (1) | ​ |  | 25 | ​ |  | (1) | ​ |  | 25
Corporate bonds | ​ | 12 | ​ |  | — | ​ |  | — | ​ |  | (9,349) | ​ |  | 48,644 | ​ |  | (9,349) | ​ |  | 48,644
Total available-for-sale investment securities | ​ | 129 | ​ | $ | (3) | ​ | $ | 532 | ​ | $ | (98,020) | ​ | $ | 485,527 | ​ | $ | (98,023) | ​ | $ | 486,059
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ The Company determined that the expected credit loss on its HTM portfolio was $207 thousand and $213 thousand as of March 31, 2024, and December 31, 2023, respectively. The change in the ACL on HTM debt securities was due to a change in the provision for credit losses, with no charge-offs or recoveries for the three months ended March 31, 2024. As of March 31, 2024 and December 31, 2023, none of the Company’s HTM debt securities were past due or on nonaccrual status. The Company did not recognize any interest income on nonaccrual HTM debt securities during the three months ended March 31, 2024 and 2023. ​ The following table presents amortized cost and fair value of AFS investment securities and the carrying value and fair value of HTM investment securities as of March 31, 2024, by contractual maturity: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Held-to-maturity | ​ | Available-for-sale
​ | ​ | Carrying | ​ | Fair | ​ | Amortized | ​ | Fair
(dollars in thousands) |  | Value | ​ | Value | ​ | Cost |  | Value
Due within one year or less | ​ | $ | 8,161 | ​ | $ | 7,974 | ​ | $ | — | ​ | $ | —
Due after one year through five years | ​ |  | 47,376 | ​ |  | 43,614 | ​ |  | 473 | ​ |  | 470
Due after five years through ten years | ​ |  | 57,248 | ​ |  | 49,662 | ​ |  | 59,467 | ​ |  | 50,524
Due after 10 years | ​ |  | 12,186 | ​ |  | 10,736 | ​ |  | 384 | ​ |  | 385
​ | ​ | ​ | 124,971 | ​ | ​ | 111,986 | ​ | ​ | 60,324 | ​ | ​ | 51,379
Mortgage-backed securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential agency | ​ | ​ | 167,168 | ​ | ​ | 137,821 | ​ | ​ | 513,409 | ​ | ​ | 420,893
Total investment securities | ​ | $ | 292,139 | ​ | $ | 249,807 | ​ | $ | 573,733 | ​ | $ | 472,272
​ Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Investment securities with a total carrying value of $559.1 million and $250.0 million were pledged as of March 31, 2024 and December 31, 2023, respectively, to secure public deposits and for other purposes required or permitted by law. As of March 31, 2024 and December 31, 2023, the carrying value of the Company’s Federal Reserve stock and Federal Home Loan Bank of Des Moines, or FHLB, stock was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
(dollars in thousands) |  | 2024 |  | 2023
Federal Reserve | ​ | $ | 4,623 | ​ | $ | 4,623
FHLB | ​ |  | 11,491 | ​ |  | 16,566
​ ​ These securities can only be redeemed or sold at their par value and only to the respective issuing institution or to another member institution. The Company records these non-marketable equity securities as a component of other assets and periodically evaluates these securities for impairment. Management considers these non-marketable equity securities to be long-term investments. Accordingly, when evaluating these securities for impairment, management considers the ultimate recoverability of the par value rather than recognizing temporary declines in value. Visa Class B Restricted Shares In 2008, the Company received Visa Class B restricted shares as part of Visa’s initial public offering. These shares are transferable only under limited circumstances until they can be converted into the publicly traded Class A common shares. This conversion will not occur until the settlement of certain litigation which will be indemnified by Visa members, including the Company. Visa funded an escrow account from its initial public offering to settle these litigation claims. Should this escrow account be insufficient to cover these litigation claims, Visa is entitled to fund additional amounts to the escrow account by reducing each member bank’s Class B conversion ratio to unrestricted Class A shares. As of March 31, 2024, the conversion ratio was 1.5875. Based on the existing transfer restriction and the uncertainty of the outcome of the Visa litigation mentioned above, the 6,924 Class B shares (10,992 Class A equivalents) that the Company owned as of March 31, 2024 and December 31, 2023, were carried at a zero cost basis.

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