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Investment Securities | 12 Months Ended
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Dec. 31, 2022
Investment Securities |
Investment Securities | NOTE 5 Investment Securities The following tables present amortized cost, gross unrealized gains and losses, and fair value of the available-for-sale investment securities and held-to-maturity investment securities as of December 31, 2022 and 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(dollars in thousands) |  | Cost | ​ | Gains | ​ | Losses |  | Value
Available-for-sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury and agencies | ​ | $ | 3,518 | ​ | $ | 19 | ​ | $ | (17) | ​ | $ | 3,520
Mortgage backed securities | ​ |  |  | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Residential agency | ​ |  | 705,845 | ​ |  | 2 | ​ |  | (118,168) | ​ |  | 587,679
Commercial | ​ |  | 70,669 | ​ |  | — | ​ |  | (7,111) | ​ |  | 63,558
Asset backed securities | ​ |  | 34 | ​ |  | — | ​ |  | — | ​ |  | 34
Corporate bonds | ​ |  | 69,501 | ​ |  | — | ​ |  | (6,968) | ​ |  | 62,533
Total available-for-sale investment securities | ​ | ​ | 849,567 | ​ | ​ | 21 | ​ | ​ | (132,264) | ​ | ​ | 717,324
Held-to-maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Obligations of state and political agencies | ​ | ​ | 137,787 | ​ |  | — | ​ |  | (17,736) | ​ |  | 120,051
Mortgage backed securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential agency | ​ | ​ | 184,115 | ​ |  | — | ​ |  | (33,254) | ​ |  | 150,861
Total held-to-maturity investment securities | ​ | ​ | 321,902 | ​ | ​ | — | ​ | ​ | (50,990) | ​ | ​ | 270,912
Total investment securities | ​ | $ | 1,171,469 | ​ | $ | 21 | ​ | $ | (183,254) | ​ | $ | 988,236
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(dollars in thousands) |  | Cost | ​ | Gains | ​ | Losses |  | Value
Available-for-sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury and agencies | ​ | $ | 5,028 | ​ | $ | 75 | ​ | $ | — | ​ | $ | 5,103
Mortgage backed securities | ​ |  |  | ​ |  | ​ | ​ |  | ​ | ​ |  |
Residential agency | ​ |  | 717,781 | ​ |  | 1,213 | ​ |  | (11,837) | ​ |  | 707,157
Commercial | ​ |  | 88,362 | ​ |  | 2,674 | ​ |  | (123) | ​ |  | 90,913
Asset backed securities | ​ |  | 52 | ​ | ​ | 2 | ​ |  | — | ​ |  | 54
Corporate bonds | ​ |  | 49,035 | ​ |  | 1,398 | ​ |  | (11) | ​ |  | 50,422
Total available-for-sale investment securities | ​ | ​ | 860,258 | ​ | ​ | 5,362 | ​ | ​ | (11,971) | ​ | ​ | 853,649
Held-to-maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Obligations of state and political agencies | ​ | ​ | 144,543 | ​ | ​ | 1,110 | ​ | ​ | (349) | ​ | ​ | 145,304
Mortgage backed securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential agency | ​ | ​ | 207,518 | ​ | ​ | — | ​ | ​ | (3,145) | ​ | ​ | 204,373
Total held-to-maturity investment securities | ​ | ​ | 352,061 | ​ | ​ | 1,110 | ​ | ​ | (3,494) | ​ | ​ | 349,677
Total investment securities | ​ | $ | 1,212,319 | ​ | $ | 6,472 | ​ | $ | (15,465) | ​ | $ | 1,203,326
​ On April 1, 2021, the Company transferred its state and political agencies debt securities portfolio, with a fair value of $149.2 million and a net unrealized gain of $1.3 million, from available-for-sale to held-to-maturity. The amortized cost and estimated fair value of investment securities at December 31, 2022, by contractual maturity are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Held-to-maturity | ​ | Available-for-sale
​ | ​ | Carrying | ​ | Fair | ​ | Amortized | ​ | Fair
(dollars in thousands) |  | Value | ​ | Value | ​ | Cost |  | Value
Due within one year or less | ​ | $ | 6,554 | ​ | $ | 6,522 | ​ | $ | 4 | ​ | $ | 4
Due after one year through five years | ​ |  | 40,317 | ​ |  | 37,146 | ​ |  | 21,256 | ​ |  | 19,863
Due after five years through ten years | ​ |  | 69,992 | ​ |  | 59,138 | ​ |  | 87,961 | ​ |  | 79,697
Due after 10 years | ​ |  | 205,039 | ​ |  | 168,106 | ​ |  | 740,346 | ​ |  | 617,760
Total investment securities | ​ | $ | 321,902 | ​ | $ | 270,912 | ​ | $ | 849,567 | ​ | $ | 717,324
​ 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 $260.7 million and $192.8 million, were pledged at December 31, 2022 and 2021, respectively, to secure public deposits and for other purposes required or permitted by law. Proceeds from the sale of available-for-sale securities for the years ended December 31, 2022, 2021, and 2020 are displayed in the table below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended
​ | ​ | December 31,
(dollars in thousands) |  | 2022 |  | 2021 |  | 2020
Proceeds | ​ | $ | — | ​ | $ | 13,189 | ​ | $ | 75,647
Realized gains | ​ |  | — | ​ |  | 114 | ​ | ​ | 2,737
Realized losses | ​ |  | — | ​ |  | — | ​ | ​ | —
​ Proceeds from the sale or call of held-to-maturity securities for the years ended December 31, 2022, 2021 and 2020 are displayed in the table below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended
​ | ​ | December 31,
(dollars in thousands) |  | 2022 |  | 2021 |  | 2020
Proceeds | ​ | $ | 963 | ​ | $ | 1,772 | ​ | $ | —
Realized gains | ​ |  | — | ​ |  | 11 | ​ | ​ | —
Realized losses | ​ |  | — | ​ |  | — | ​ | ​ | —
​ During the year ended December 31, 2022, there were no sales of held-to-maturity securities. During the year ended December 31, 2021 the company sold one held-to-maturity security with an amortized cost of $330 thousand. Proceeds from the sale totaled $348 thousand, resulting in realized gains of $11 thousand. For this sale of a held-to-maturity security, the Company received evidence of a significant deterioration of the issuer’s creditworthiness. There were no sales of held-to-maturity securities during the year ended December 31, 2020. Information pertaining to investment securities with gross unrealized losses that are not deemed to be other-than-temporarily impaired at December 31, 2022 and 2021 aggregated by investment category and length of time that individual investment securities have been in a continuous loss position, follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ | ​ | Less than 12 Months | ​ | Over 12 Months | ​ | Total
​ | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair
(dollars in thousands) |  | Losses |  | Value |  | Losses |  | Value |  | Losses |  | Value
Available-for-sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury and agencies | ​ | $ | (17) | ​ | $ | 509 | ​ | $ | — | ​ | $ | — | ​ | $ | (17) | ​ | $ | 509
Mortgage backed securities | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Residential agency | ​ |  | (10,457) | ​ |  | 79,693 | ​ |  | (107,711) | ​ |  | 507,418 | ​ |  | (118,168) | ​ |  | 587,111
Commercial | ​ |  | (4,835) | ​ |  | 50,437 | ​ |  | (2,276) | ​ |  | 13,120 | ​ |  | (7,111) | ​ |  | 63,557
Asset backed securities | ​ |  | — | ​ |  | 32 | ​ |  | — | ​ |  | 2 | ​ |  | — | ​ |  | 34
Corporate bonds | ​ |  | (4,452) | ​ |  | 48,048 | ​ |  | (2,516) | ​ |  | 14,484 | ​ |  | (6,968) | ​ |  | 62,532
Total available-for-sale investment securities | ​ | ​ | (19,761) | ​ | ​ | 178,719 | ​ | ​ | (112,503) | ​ | ​ | 535,024 | ​ | ​ | (132,264) | ​ | ​ | 713,743
Held-to-maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Obligations of state and political agencies | ​ | ​ | (3,336) | ​ | ​ | 18,788 | ​ | ​ | (14,400) | ​ | ​ | 98,762 | ​ | ​ | (17,736) | ​ | ​ | 117,550
Mortgage backed securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential agency | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (33,254) | ​ | ​ | 150,861 | ​ | ​ | (33,254) | ​ | ​ | 150,861
Total held-to-maturity investment securities | ​ | ​ | (3,336) | ​ | ​ | 18,788 | ​ | ​ | (47,654) | ​ | ​ | 249,623 | ​ | ​ | (50,990) | ​ | ​ | 268,411
Total investment securities | ​ | $ | (23,097) | ​ | $ | 197,507 | ​ | $ | (160,157) | ​ | $ | 784,647 | ​ | $ | (183,254) | ​ | $ | 982,154
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
​ | ​ | Less than 12 Months | ​ | Over 12 Months | ​ | Total
​ | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair
(dollars in thousands) |  | Losses |  | Value |  | Losses |  | Value |  | Losses |  | Value
Available-for-sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury and agencies | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Mortgage backed securities | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Residential agency | ​ |  | (10,156) | ​ |  | 554,811 | ​ |  | (1,681) | ​ |  | 55,082 | ​ |  | (11,837) | ​ |  | 609,893
Commercial | ​ |  | (123) | ​ |  | 17,470 | ​ |  | — | ​ |  | — | ​ |  | (123) | ​ |  | 17,470
Asset backed securities | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 2 | ​ |  | — | ​ |  | 2
Corporate bonds | ​ |  | (11) | ​ |  | 5,989 | ​ |  | — | ​ |  | — | ​ |  | (11) | ​ |  | 5,989
Total available-for-sale investment securities | ​ | ​ | (10,290) | ​ | ​ | 578,270 | ​ | ​ | (1,681) | ​ | ​ | 55,084 | ​ | ​ | (11,971) | ​ | ​ | 633,354
Held-to-maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Obligations of state and political agencies | ​ | ​ | (349) | ​ | ​ | 53,210 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (349) | ​ | ​ | 53,210
Mortgage backed securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential agency | ​ | ​ | (3,145) | ​ | ​ | 204,373 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (3,145) | ​ | ​ | 204,373
Total held-to-maturity investment securities | ​ | ​ | (3,494) | ​ | ​ | 257,583 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (3,494) | ​ | ​ | 257,583
Total investment securities | ​ | $ | (13,784) | ​ | $ | 835,853 | ​ | $ | (1,681) | ​ | $ | 55,084 | ​ | $ | (15,465) | ​ | $ | 890,937
​ For all of the above investment securities, the unrealized losses were generally due to changes in interest rates and unrealized losses are considered to be temporary as the fair value is expected to recover as the securities approach maturity. The Company evaluates securities for other-than-temporary impairment, or OTTI, on a quarterly basis, at a minimum, and more frequently when economic or market concerns warrant such evaluation. In estimating OTTI losses, consideration is given to the severity and duration of the impairment; the financial condition and near-term prospects of the issuer, which for debt securities, considers external credit ratings and recent downgrades and the intent and ability of the Company to hold the security for a period of time sufficient for a recovery in value. For the years ended December 31, 2022 and 2021, the Company did not believe any OTTI existed and therefore did not recognize any OTTI losses on its investment securities. As of December 31, 2022 and 2021, the carrying value of the Company’s Federal Reserve Bank stock and FHLB stock was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
(dollars in thousands) |  | 2022 |  | 2021
Federal Reserve | ​ | $ | 4,595 | ​ | $ | 2,675
FHLB | ​ |  | 19,362 | ​ |  | 3,806
​ These securities can only be redeemed or sold at their par value and only to the respective issuing institution or to another member institution. 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 December 31, 2022, the conversion ratio was 1.5991. Based on the existing transfer restriction and the uncertainty of the outcome of the Visa litigation mentioned above, the 6,924 Class B shares (11,702 Class A equivalents) that the Company owned as of December 31, 2022 and 2021, were carried at a zero cost basis.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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