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Investment Securities | 6 Months Ended
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Jun. 30, 2022
Investment Securities |
Investment Securities | NOTE 3 Investment Securities The following tables present amortized cost, gross unrealized gain and losses, and fair value of the available-for-sale investment securities and the amortized cost, net unrealized gains, carrying value, gross unrealized gains and losses and fair value of for held-to-maturity as of June 30, 2022 and December 31, 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2022
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(dollars in thousands) |  | Cost | ​ | Gains | ​ | Losses |  | Value
Available-for-sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. Treasury and agencies | ​ | $ | 3,643 | ​ | $ | 66 | ​ | $ | — | ​ | $ | 3,709
Mortgage backed securities | ​ |  |  | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Residential agency | ​ |  | 740,734 | ​ |  | 27 | ​ |  | (88,254) | ​ |  | 652,507
Commercial | ​ |  | 80,077 | ​ |  | — | ​ |  | (3,947) | ​ |  | 76,130
Asset backed securities | ​ |  | 40 | ​ |  | — | ​ |  | — | ​ |  | 40
Corporate bonds | ​ |  | 69,031 | ​ |  | 130 | ​ |  | (2,750) | ​ |  | 66,411
Total available-for-sale investment securities | ​ | ​ | 893,525 | ​ | ​ | 223 | ​ | ​ | (94,951) | ​ | ​ | 798,797
Held-to-maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Obligations of state and political agencies | ​ | ​ | 139,102 | ​ |  | 2 | ​ |  | (12,927) | ​ |  | 126,177
Mortgage backed securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential agency | ​ | ​ | 192,639 | ​ |  | — | ​ |  | (24,867) | ​ |  | 167,772
Total held-to-maturity investment securities | ​ | ​ | 331,741 | ​ | ​ | 2 | ​ | ​ | (37,794) | ​ | ​ | 293,949
Total investment securities | ​ | $ | 1,225,266 | ​ | $ | 225 | ​ | $ | (132,745) | ​ | $ | 1,092,746
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​ Gross unrealized losses on investment securities and the fair value of the related securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of June 30, 2022 and December 31, 2021, were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 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 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Mortgage backed securities | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Residential agency | ​ |  | (51,859) | ​ |  | 436,234 | ​ |  | (36,395) | ​ |  | 214,079 | ​ |  | (88,254) | ​ |  | 650,313
Commercial | ​ |  | (3,947) | ​ |  | 76,130 | ​ |  | — | ​ |  | — | ​ |  | (3,947) | ​ |  | 76,130
Asset backed securities | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 2 | ​ |  | — | ​ |  | 2
Corporate bonds | ​ |  | (2,750) | ​ |  | 56,780 | ​ |  | — | ​ |  | — | ​ |  | (2,750) | ​ |  | 56,780
Total available-for-sale investment securities | ​ | ​ | (58,556) | ​ | ​ | 569,144 | ​ | ​ | (36,395) | ​ | ​ | 214,081 | ​ | ​ | (94,951) | ​ | ​ | 783,225
Held-to-maturity | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Obligations of state and political agencies | ​ | ​ | (12,927) | ​ | ​ | 122,734 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (12,927) | ​ | ​ | 122,734
Mortgage backed securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential agency | ​ | ​ | (24,867) | ​ | ​ | 167,772 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (24,867) | ​ | ​ | 167,772
Total held-to-maturity investment securities | ​ | ​ | (37,794) | ​ | ​ | 290,506 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (37,794) | ​ | ​ | 290,506
Total investment securities | ​ | $ | (96,350) | ​ | $ | 859,650 | ​ | $ | (36,395) | ​ | $ | 214,081 | ​ | $ | (132,745) | ​ | $ | 1,073,731
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 were considered to be temporary as the fair value is expected to recover as the securities approach their maturity dates. The Company expects that it could see a continued increase in unrealized losses if the Federal Reserve continues to raise interest rates. 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 three and six months ended June 30, 2022 and 2021, the Company did not recognize OTTI losses on its investment securities. The following table presents amortized cost and fair value of available-for-sale and carrying value and fair value of held-to-maturity investment securities as of June 30, 2022, 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 | ​ | $ | 6,831 | ​ | $ | 6,794 | ​ | $ | 20 | ​ | $ | 21
Due after one year through five years | ​ |  | 36,025 | ​ |  | 33,922 | ​ |  | 21,599 | ​ |  | 21,017
Due after five years through ten years | ​ |  | 72,720 | ​ |  | 65,003 | ​ |  | 94,957 | ​ |  | 91,522
Due after 10 years | ​ |  | 216,165 | ​ |  | 188,230 | ​ |  | 776,949 | ​ |  | 686,237
Total investment securities | ​ | $ | 331,741 | ​ | $ | 293,949 | ​ | $ | 893,525 | ​ | $ | 798,797
​ 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 $267.3 million and $192.8 million were pledged as of June 30, 2022 and December 31, 2021, respectively, to secure public deposits and for other purposes required or permitted by law. Proceeds from the sale or call of available-for-sale investment securities, for the three and six months ended June 30, 2022 and 2021, are displayed in the table below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
(dollars in thousands) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Proceeds | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 13,189
Realized gains | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | 114
Realized losses | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
​ Proceeds from the call of held-to-maturity investment securities, for the three and six months ended June 30, 2022 and 2021, are displayed in the table below: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
(dollars in thousands) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Proceeds | ​ | $ | 211 | ​ | $ | — | ​ | $ | 726 | ​ | $ | 1,415
Realized gains | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
Realized losses | ​ |  | — | ​ |  | — | ​ |  | — | ​ |  | —
​ As of June 30, 2022 and December 31, 2021, the carrying value of the Company’s Federal Reserve stock and Federal Home Loan Bank of Des Moines, or FHLB, stock was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
(dollars in thousands) |  | 2022 |  | 2021
Federal Reserve | ​ | $ | 2,675 | ​ | $ | 2,675
FHLB | ​ |  | 13,938 | ​ |  | 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. 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 June 30, 2022, the conversion ratio was 1.6059. Based on the existing transfer restriction and the uncertainty of the outcome of the Visa litigation mentioned above, the 6,924 Class B shares (11,119 Class A equivalents) that the Company owned as of June 30, 2022 and December 31, 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 http://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 http://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 http://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 http://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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