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Securities | 6 Months Ended
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Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Securities | Securities The book values and approximate fair values of investment securities at June 30, 2021 and December 31, 2020 are summarized as follows:
($ in thousands) | June 30, 2021 |  | December 31, 2020
Amortized Cost |  | Fair Value |  | Unrealized |  | Amortized Cost |  | Fair Value |  | Unrealized
|  | Gains |  | (Losses) |  |  |  | Gains |  | (Losses)
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government-sponsored enterprise securities | $ | 70,015 |  |  | 67,872 |  |  | — |  |  | (2,143) |  |  | 70,016 |  |  | 70,206 |  |  | 371 |  |  | (181) |
Mortgage-backed securities | 2,000,949 |  |  | 2,002,319 |  |  | 18,541 |  |  | (17,171) |  |  | 1,318,998 |  |  | 1,337,706 |  |  | 20,832 |  |  | (2,124) |
Corporate bonds | 43,650 |  |  | 44,962 |  |  | 1,458 |  |  | (146) |  |  | 43,670 |  |  | 45,220 |  |  | 1,760 |  |  | (210) |
Total available for sale | $ | 2,114,614 |  |  | 2,115,153 |  |  | 19,999 |  |  | (19,460) |  |  | 1,432,684 |  |  | 1,453,132 |  |  | 22,963 |  |  | (2,515) |
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities | $ | 24,267 |  |  | 25,236 |  |  | 969 |  |  | — |  |  | 29,959 |  |  | 30,900 |  |  | 941 |  |  | — |
State and local governments | 267,461 |  |  | 267,538 |  |  | 2,278 |  |  | (2,201) |  |  | 137,592 |  |  | 139,834 |  |  | 2,407 |  |  | (165) |
Total held to maturity | $ | 291,728 |  |  | 292,774 |  |  | 3,247 |  |  | (2,201) |  |  | 167,551 |  |  | 170,734 |  |  | 3,348 |  |  | (165) |
All of the Company’s mortgage-backed securities were issued by government-sponsored corporations, except for private mortgage-backed securities with a fair value of $0.9 million and $1.0 million as of June 30, 2021 and December 31, 2020, respectively. The following table presents information regarding securities with unrealized losses at June 30, 2021:
($ in thousands) | Securities in an Unrealized Loss Position for Less than 12 Months |  | Securities in an Unrealized Loss Position for More than 12 Months |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Government-sponsored enterprise securities | $ | 67,872 |  |  | 2,143 |  |  | — |  |  | — |  |  | 67,872 |  |  | 2,143 |
Mortgage-backed securities | 1,189,049 |  |  | 16,975 |  |  | 12,596 |  |  | 196 |  |  | 1,201,645 |  |  | 17,171 |
Corporate bonds | — |  |  | — |  |  | 4,853 |  |  | 146 |  |  | 4,853 |  |  | 146 |
State and local governments | 90,880 |  |  | 2,201 |  |  | — |  |  | — |  |  | 90,880 |  |  | 2,201 |
Total unrealized loss position | $ | 1,347,801 |  |  | 21,319 |  |  | 17,449 |  |  | 342 |  |  | 1,365,250 |  |  | 21,661 |
The following table presents information regarding securities with unrealized losses at December 31, 2020:
($ in thousands) | Securities in an Unrealized Loss Position for Less than 12 Months |  | Securities in an Unrealized Loss Position for More than 12 Months |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Government-sponsored enterprise securities | $ | 29,812 |  |  | 181 |  |  | — |  |  | — |  |  | 29,812 |  |  | 181 |
Mortgage-backed securities | 497,992 |  |  | 1,957 |  |  | 6,168 |  |  | 167 |  |  | 504,160 |  |  | 2,124 |
Corporate bonds | 3,956 |  |  | 45 |  |  | 835 |  |  | 165 |  |  | 4,791 |  |  | 210 |
State and local governments | 23,310 |  |  | 165 |  |  | — |  |  | — |  |  | 23,310 |  |  | 165 |
Total unrealized loss position | $ | 555,070 |  |  | 2,348 |  |  | 7,003 |  |  | 332 |  |  | 562,073 |  |  | 2,680 |
As of June 30, 2021 and December 31, 2020, the Company's security portfolio held 155 securities and 69 securities that were in an unrealized loss position, respectively. In the above tables, all of the securities that were in an unrealized loss position at June 30, 2021 and December 31, 2020 are bonds that the Company has determined are in a loss position due primarily to interest rate factors and not credit quality concerns. In arriving at this conclusion, the Company reviewed third-party credit ratings and considered the severity of the impairment. The Company does not intend to sell these securities, and it is more likely than not that the Company will not be required to sell these securities before recovery of the amortized cost. No impairment charges were recognized for any securities during the six months ended June 30, 2020. At adoption of CECL on January 1, 2021 and at June 30, 2021, the Company determined that expected credit losses associated with held to maturity debt securities were insignificant. See Note 2 for additional details on the adoption of CECL as it relates to the securities portfolio. The book values and approximate fair values of investment securities at June 30, 2021, by contractual maturity, are summarized in the table below. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
| Securities Available for Sale |  | Securities Held to Maturity
($ in thousands) | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Securities |  |  |  |  |  |  |
Due within one year | $ | — |  |  | — |  |  | 1,262 |  |  | 1,283 |
Due after one year but within five years | 28,650 |  |  | 29,931 |  |  | 537 |  |  | 553 |
Due after five years but within ten years | 74,015 |  |  | 72,409 |  |  | 8,766 |  |  | 8,825 |
Due after ten years | 11,000 |  |  | 10,494 |  |  | 256,896 |  |  | 256,877 |
Mortgage-backed securities | 2,000,949 |  |  | 2,002,319 |  |  | 24,267 |  |  | 25,236 |
Total securities | $ | 2,114,614 |  |  | 2,115,153 |  |  | 291,728 |  |  | 292,774 |
At June 30, 2021 and December 31, 2020 investment securities with carrying values of $812,763,000 and $630,303,000, respectively, were pledged as collateral for public deposits. Included in “other assets” in the Consolidated Balance Sheets are investments in Federal Home Loan Bank (“FHLB”) and Federal Reserve Bank of Richmond (“FRB”) stock totaling $21,690,000 and $23,526,000 at June 30, 2021 and December 31, 2020, respectively. These investments do not have readily determinable fair values. The FHLB stock had a cost and fair value of $3,970,000 and $5,855,000 at June 30, 2021 and December 31, 2020, respectively, and serves as part of the collateral for the Company’s line of credit with the FHLB and is also a requirement for membership in the FHLB system. The FRB stock had a cost and fair value of $17,720,000 and $17,671,000 at June 30, 2021 and December 31, 2020, respectively, and is a requirement for FRB member bank qualification. Periodically, both the FHLB and FRB recalculate the Company’s required level of holdings, and the Company either buys more stock or redeems a portion of the stock at cost. The Company determined that neither stock was impaired at either period end. The Company owns 12,356 Class B shares of Visa, Inc. (“Visa”) stock that were received upon Visa’s initial public offering. These shares are expected to convert into Class A Visa shares subsequent to the settlement of certain litigation against Visa, to which the Company is not a party. The Class B shares have transfer restrictions, and the conversion rate into Class A shares is periodically adjusted as Visa settles litigation. The conversion rate at June 30, 2021 was approximately 1.62, which means the Company would receive approximately 20,051 Class A shares if the stock had converted on that date. This Class B stock does not have a readily determinable fair value and is carried at zero. If a readily determinable fair value becomes available for the Class B shares, or upon the conversion to Class A shares, the Company will adjust the carrying value of the stock to its market value with a credit to earnings.

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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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