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Investment Securities | 9 Months Ended
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Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract] |
Investment Securities | Investment Securities Available-For-Sale The following table shows investment securities available-for-sale.
(Dollars in thousands) |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
September 30, 2022 |  |  |  |  |  |  |  |
U.S. Treasury and Federal agencies securities |  | $ | 1,131,244 |  |  | $ | — |  |  | $ | (99,667) |  |  | $ | 1,031,577 |
U.S. States and political subdivisions securities |  | 126,008 |  |  | — |  |  | (10,777) |  |  | 115,231 |
Mortgage-backed securities — Federal agencies |  | 739,896 |  |  | 4 |  |  | (102,210) |  |  | 637,690 |
Corporate debt securities |  | 16,496 |  |  | — |  |  | (383) |  |  | 16,113 |
Foreign government and other securities |  | 600 |  |  | — |  |  | (17) |  |  | 583 |
Total debt securities available-for-sale |  | $ | 2,014,244 |  |  | $ | 4 |  |  | $ | (213,054) |  |  | $ | 1,801,194 |
December 31, 2021 |  |  |  |  |  |  |  |
U.S. Treasury and Federal agencies securities |  | $ | 1,093,780 |  |  | $ | 3,244 |  |  | $ | (13,018) |  |  | $ | 1,084,006 |
U.S. States and political subdivisions securities |  | 95,700 |  |  | 1,130 |  |  | (1,129) |  |  | 95,701 |
Mortgage-backed securities — Federal agencies |  | 663,441 |  |  | 4,745 |  |  | (8,459) |  |  | 659,727 |
Corporate debt securities |  | 22,510 |  |  | 499 |  |  | — |  |  | 23,009 |
Foreign government and other securities |  | 600 |  |  | — |  |  | (2) |  |  | 598 |
Total debt securities available-for-sale |  | $ | 1,876,031 |  |  | $ | 9,618 |  |  | $ | (22,608) |  |  | $ | 1,863,041 |
Amortized cost excludes accrued interest receivable which is included in Accrued Income and Other Assets on the Consolidated Statements of Financial Condition. At September 30, 2022 and December 31, 2021, accrued interest receivable on investment securities available-for-sale was $5.30 million and $4.80 million, respectively. At September 30, 2022 and December 31, 2021, the residential mortgage-backed securities held by the Company consisted primarily of GNMA, FNMA and FHLMC pass-through certificates which are guaranteed by those respective agencies of the United States government (Government Sponsored Enterprise, GSEs). The following table shows the contractual maturities of investments in debt securities available-for-sale at September 30, 2022. Expected maturities will differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
(Dollars in thousands) |  | Amortized Cost |  | Fair Value
Due in one year or less |  | $ | 85,315 |  |  | $ | 84,424 |
Due after one year through five years |  | 1,118,538 |  |  | 1,017,205 |
Due after five years through ten years |  | 39,021 |  |  | 32,807 |
Due after ten years |  | 31,474 |  |  | 29,068 |
Mortgage-backed securities |  | 739,896 |  |  | 637,690 |
Total debt securities available-for-sale |  | $ | 2,014,244 |  |  | $ | 1,801,194 |
The following table summarizes gross unrealized losses and fair value by investment category and age. At September 30, 2022, the Company’s available-for-sale securities portfolio consisted of 748 securities, 728 of which were in an unrealized loss position.
|  | Less than 12 Months |  | 12 months or Longer |  | Total
(Dollars in thousands) |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and Federal agencies securities |  | $ | 344,947 |  |  | $ | (19,238) |  |  | $ | 686,630 |  |  | $ | (80,429) |  |  | $ | 1,031,577 |  |  | $ | (99,667) |
U.S. States and political subdivisions securities |  | 80,326 |  |  | (5,194) |  |  | 33,630 |  |  | (5,583) |  |  | 113,956 |  |  | (10,777) |
Mortgage-backed securities - Federal agencies |  | 332,094 |  |  | (39,091) |  |  | 304,448 |  |  | (63,119) |  |  | 636,542 |  |  | (102,210) |
Corporate debt securities |  | 16,113 |  |  | (383) |  |  | — |  |  | — |  |  | 16,113 |  |  | (383) |
Foreign government and other securities |  | 487 |  |  | (13) |  |  | 96 |  |  | (4) |  |  | 583 |  |  | (17) |
Total debt securities available-for-sale |  | $ | 773,967 |  |  | $ | (63,919) |  |  | $ | 1,024,804 |  |  | $ | (149,135) |  |  | $ | 1,798,771 |  |  | $ | (213,054) |
December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and Federal agencies securities |  | $ | 789,536 |  |  | $ | (10,728) |  |  | $ | 84,191 |  |  | $ | (2,290) |  |  | $ | 873,727 |  |  | $ | (13,018) |
U.S. States and political subdivisions securities |  | 39,585 |  |  | (980) |  |  | 4,875 |  |  | (149) |  |  | 44,460 |  |  | (1,129) |
Mortgage-backed securities - Federal agencies |  | 454,413 |  |  | (7,312) |  |  | 35,232 |  |  | (1,147) |  |  | 489,645 |  |  | (8,459) |
Corporate debt securities |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Foreign government and other securities |  | 598 |  |  | (2) |  |  | — |  |  | — |  |  | 598 |  |  | (2) |
Total debt securities available-for-sale |  | $ | 1,284,132 |  |  | $ | (19,022) |  |  | $ | 124,298 |  |  | $ | (3,586) |  |  | $ | 1,408,430 |  |  | $ | (22,608) |
The Company does not consider available-for-sale securities with unrealized losses at September 30, 2022 to be experiencing credit losses and recognized no resulting allowance for credit losses. The Company does not intend to sell these investments and it is more likely than not that the Company will not be required to sell these investments before recovery of the amortized cost basis, which may be the maturity dates of the securities. The unrealized losses occurred as a result of changes in interest rates, market spreads and market conditions subsequent to purchase. The following table shows the gross realized gains and losses from the available-for-sale debt securities portfolio. Realized gains and losses of all securities are computed using the specific identification cost basis.
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
(Dollars in thousands) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Gross realized gains |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 221 |
Gross realized losses |  | — |  |  | — |  |  | — |  |  | (901) |
Net realized gains (losses) |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (680) |
At September 30, 2022 and December 31, 2021, investment securities available-for-sale with carrying values of $264.35 million and $351.13 million, respectively, were pledged as collateral for security repurchase agreements and for other purposes.

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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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