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Investments | 6 Months Ended
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Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Investments | INVESTMENTS The following tables present the amortized cost, gross unrealized gains and losses, allowance for credit losses and fair value of securities available for sale and held to maturity:
| June 30, 2021
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  |  |  | Fair Value
Available-for-sale securities: |  |  |  |  |  |  |  |  |
Obligations of U.S. Government-sponsored enterprises | $ | 99,490 |  |  | $ | 93 |  |  | $ | (329) |  |  |  |  | $ | 99,254 |
Obligations of states and political subdivisions | 475,710 |  |  | 6,328 |  |  | (1,193) |  |  |  |  | 480,845 |
Agency mortgage-backed securities | 464,288 |  |  | 14,393 |  |  | (1,302) |  |  |  |  | 477,379 |
U.S. Treasury bills | 10,985 |  |  | 361 |  |  | — |  |  |  |  | 11,346 |
Corporate debt securities | 14,750 |  |  | 649 |  |  | — |  |  |  |  | 15,399 |
Total securities available for sale | $ | 1,065,223 |  |  | $ | 21,824 |  |  | $ | (2,824) |  |  |  |  | $ | 1,084,223 |
Held-to-maturity securities: |  |  |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 240,163 |  |  | $ | 1,845 |  |  | $ | (763) |  |  |  |  | $ | 241,245 |
Agency mortgage-backed securities | 84,544 |  |  | 1,403 |  |  | (268) |  |  |  |  | 85,679 |
Corporate debt securities | 126,407 |  |  | 5,694 |  |  | — |  |  |  |  | 132,101 |
Total securities held-to-maturity | $ | 451,114 |  |  | $ | 8,942 |  |  | $ | (1,031) |  |  |  |  | $ | 459,025 |
Allowance for credit losses | (449) |  |  |  |  |  |  |  |  |
Total securities held-to-maturity, net | $ | 450,665 |  |  |  |  |  |  |  |  |
| December 31, 2020
(in thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale securities: |  |  |  |  |  |  |
Obligations of U.S. Government-sponsored enterprises | $ | 14,978 |  |  | $ | 186 |  |  | $ | (3) |  |  | $ | 15,161 |
Obligations of states and political subdivisions | 335,271 |  |  | 8,994 |  |  | (33) |  |  | 344,232 |
Agency mortgage-backed securities | 506,703 |  |  | 20,190 |  |  | (321) |  |  | 526,572 |
U.S. Treasury Bills | 10,980 |  |  | 486 |  |  | — |  |  | 11,466 |
Corporate debt securities | 14,750 |  |  | 248 |  |  | — |  |  | 14,998 |
Total securities available for sale | $ | 882,682 |  |  | $ | 30,104 |  |  | $ | (357) |  |  | $ | 912,429 |
Held-to-maturity securities: |  |  |  |  |  |  |
Obligations of states and political subdivisions | $ | 248,324 |  |  | $ | 2,814 |  |  | $ | — |  |  | $ | 251,138 |
Agency mortgage-backed securities | 112,742 |  |  | 2,295 |  |  | (496) |  |  | 114,541 |
Corporate debt securities | 126,993 |  |  | 8,851 |  |  | — |  |  | 135,844 |
Total securities held to maturity | $ | 488,059 |  |  | $ | 13,960 |  |  | $ | (496) |  |  | $ | 501,523 |
Less: Allowance for credit losses | 449 |  |  |  |  |  |  |
Total securities held-to-maturity, net | $ | 487,610 |  |  |  |  |  |  |
At June 30, 2021 and December 31, 2020, there were no holdings of securities of any one issuer in an amount greater than 10% of shareholders’ equity, other than U.S. Government agencies and sponsored enterprises. The agency mortgage-backed securities are all issued by U.S. Government agencies and sponsored enterprises. Securities having a fair value of $489.4 million and $525.8 million at June 30, 2021 and December 31, 2020, respectively, were pledged as collateral to secure deposits of public institutions and for other purposes as required by law or contract provisions. The amortized cost and estimated fair value of debt securities at June 30, 2021, by contractual maturity, are shown below. Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. The weighted average life of the mortgage-backed securities is approximately 4 years.
| Available for sale |  | Held to maturity
(in thousands) | Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
Due in one year or less | $ | 11,345 |  |  | $ | 11,435 |  |  | $ | — |  |  | $ | — |
Due after one year through five years | 70,321 |  |  | 70,640 |  |  | 12,469 |  |  | 12,839 |
Due after five years through ten years | 65,658 |  |  | 66,316 |  |  | 137,489 |  |  | 143,056 |
Due after ten years | 453,611 |  |  | 458,453 |  |  | 216,612 |  |  | 217,451 |
Agency mortgage-backed securities | 464,288 |  |  | 477,379 |  |  | 84,544 |  |  | 85,679 |
| $ | 1,065,223 |  |  | $ | 1,084,223 |  |  | $ | 451,114 |  |  | $ | 459,025 |
The following tables presents a summary of available-for-sale investment securities in an unrealized loss position:
| June 30, 2021
Less than 12 months |  | 12 months or more |  | Total
(in thousands) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Obligations of U.S. Government-sponsored enterprises | $ | 76,671 |  |  | $ | 329 |  |  | $ | — |  |  | $ | — |  |  | $ | 76,671 |  |  | $ | 329 |
Obligations of states and political subdivisions | $ | 142,099 |  |  | $ | 1,193 |  |  | $ | — |  |  | $ | — |  |  | $ | 142,099 |  |  | $ | 1,193 |
Agency mortgage-backed securities | 116,819 |  |  | 1,301 |  |  | 74 |  |  | 1 |  |  | 116,893 |  |  | 1,302 |
| $ | 335,589 |  |  | $ | 2,823 |  |  | $ | 74 |  |  | $ | 1 |  |  | $ | 335,663 |  |  | $ | 2,824 |
| December 31, 2020
Less than 12 months |  | 12 months or more |  | Total
(in thousands) | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
Obligations of U.S. Government-sponsored enterprises | $ | 4,997 |  |  | $ | 3 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,997 |  |  | $ | 3 |
Obligations of states and political subdivisions | $ | 4,079 |  |  | $ | 33 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,079 |  |  | $ | 33 |
Agency mortgage-backed securities | 65,986 |  |  | 321 |  |  | — |  |  | — |  |  | 65,986 |  |  | 321 |
| $ | 75,062 |  |  | $ | 357 |  |  | $ | — |  |  | $ | — |  |  | $ | 75,062 |  |  | $ | 357 |
The unrealized losses at both June 30, 2021 and December 31, 2020 were primarily attributable to changes in market interest rates after the securities were purchased. At June 30, 2021 and December 31, 2020, the Company had not recorded an ACL on available-for-sale securities. Accrued interest receivable on held-to-maturity debt securities totaled $3.5 million at June 30, 2021 and is excluded from the estimate of expected credit losses. The estimate of expected credit losses considers historical credit loss information adjusted for current conditions and reasonable and supportable forecasts. At June 30, 2021, the ACL on held-to-maturity securities was $0.4 million. During the three and six months ended June 30, 2021, there were no sales of available-for-sale investment securities. Proceeds from sales of available-for-sale investment securities during the six months ended June 30, 2020 were immaterial. Other Investments At June 30, 2021 and December 31, 2020, other investments totaled $51.0 million and $48.8 million, respectively. As a member of the FHLB system administered by the Federal Housing Finance Agency, the Bank is required to maintain a minimum investment in capital stock with the FHLB consisting of membership stock and activity-based stock. The FHLB capital stock of $12.0 million and $10.8 million at June 30, 2021 and December 31, 2020, respectively, is recorded at cost, which represents redemption value, and is included in other investments in the consolidated balance sheets. The remaining amounts in other investments primarily include various investments in SBICs, CDFIs, private equity investments, and the Company’s investment in unconsolidated trusts used to issue preferred securities to third parties.

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