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INVESTMENTS
 6 Months Ended
Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
INVESTMENTS INVESTMENTS
Investments available-for-sale
The amortized cost and estimated fair values of investments available-for-sale at the dates indicated are presented in the following table:
 June 30, 2021December 31, 2020
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value		Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
U.S. treasuries and government agencies$47,561 $352 $(8)$47,905 $42,750 $549 $(2)$43,297 
State and municipal351,238 10,102 (1,872)359,468 377,108 13,470 (211)390,367 
Mortgage-backed and asset-backed1,016,460 16,422 (6,701)1,026,181 881,201 24,078 (847)904,432 
Corporate debt7,000 472 — 7,472 9,100 825 — 9,925 
Total investments available-for-sale$1,422,259 $27,348 $(8,581)$1,441,026 $1,310,159 $38,922 $(1,060)$1,348,021 
 
Any unrealized losses in the U.S. treasuries and government agencies, state and municipal, mortgage-backed and asset-backed investment securities at June 30, 2021 are due to changes in interest rates and not credit-related events. As such, no allowance for credit losses is required at June 30, 2021. Unrealized losses on investment securities are expected to recover over time as these securities approach maturity. The Company does not intend to sell, nor is it more likely than not it will be required to sell, these securities and has sufficient liquidity to hold these securities for an adequate period of time, which may be maturity, to allow for any anticipated recovery in fair value.

The mortgage-backed securities portfolio at June 30, 2021 is composed entirely of either the most senior tranches of GNMA, FNMA or FHLMC collateralized mortgage obligations ($345.0 million), GNMA, FNMA or FHLMC mortgage-backed securities ($620.9 million) or SBA asset-backed securities ($60.3 million).
 
Gross unrealized losses and fair value by length of time that the individual available-for-sale securities have been in an unrealized loss position at the dates indicated are presented in the following tables:
 June 30, 2021
 Number
of
Securities		Less Than 12 Months12 Months or MoreTotal
(Dollars in thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. treasuries and government agencies1 $4,968 $8 $— $— $4,968 $8 
State and municipal27 74,184 1,872 — — 74,184 1,872 
Mortgage-backed and asset-backed42 349,961 6,663 7,383 38 357,344 6,701 
Total70 $429,113 $8,543 $7,383 $38 $436,496 $8,581 

 December 31, 2020
 Number
of
Securities		Less Than 12 Months12 Months or MoreTotal
(Dollars in thousands)Fair ValueUnrealized LossesFair ValueUnrealized LossesFair ValueUnrealized Losses
U.S. treasuries and government agencies2 $25,369 $2 $— $— $25,369 $2 
State and municipal8 22,753 211 — — 22,753 211 
Mortgage-backed and asset-backed24 44,746 154 76,879 693 121,625 847 
Total34 $92,868 $367 $76,879 $693 $169,747 $1,060 
 
The estimated fair values and amortized costs of debt securities available-for-sale by contractual maturity at the dates indicated are provided in the following table. The Company has allocated mortgage-backed securities into the four maturity groupings reflected in the following tables using the expected average life of the individual securities based on statistics provided by independent third party industry sources. Expected maturities will differ from contractual maturities as borrowers may have the right to prepay obligations with or without prepayment penalties.

June 30, 2021December 31, 2020
(In thousands)Fair ValueAmortized CostFair ValueAmortized Cost
U.S. treasuries and government agencies:
One year or less$39,811 $39,650 $33,963 $33,833 
One to five years8,094 7,911 9,334 8,917 
Five to ten years— — — — 
After ten years— — — — 
State and municipal:
One year or less14,374 14,205 16,581 16,458 
One to five years30,716 29,725 44,910 43,857 
Five to ten years49,123 47,307 59,059 56,130 
After ten years265,255 260,001 269,817 260,663 
Mortgage-backed and asset-backed:
One year or less5,525 5,459 1 1 
One to five years16,032 15,789 21,637 21,229 
Five to ten years85,595 83,831 74,142 72,481 
After ten years919,029 911,381 808,652 787,490 
Corporate debt:
One year or less— — — — 
One to five years— — 2,318 2,100 
Five to ten years7,472 7,000 7,607 7,000 
After ten years— — — — 
Total available-for-sale debt securities$1,441,026 $1,422,259 $1,348,021 $1,310,159 
At June 30, 2021 and December 31, 2020, investments available-for-sale with a book value of $502.4 million and $465.7 million, respectively, were pledged as collateral for certain government deposits and for other purposes as required or permitted by law. The outstanding balance of no single issuer, except for U.S. Agencies securities, exceeded ten percent of stockholders' equity at June 30, 2021 and December 31, 2020.
 
Equity securities
Other equity securities at the dates indicated are presented in the following table:
(In thousands)June 30, 2021December 31, 2020
Federal Reserve Bank stock$34,028 $38,650 
Federal Home Loan Bank of Atlanta stock6,392 26,433 
Marketable equity securities677 677 
Total equity securities$41,097 $65,760