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INVESTMENTS (Tables)
 12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost and Estimated Fair Values of Investments Available-for-sale
The amortized cost and estimated fair values of investments available-for-sale at December 31 are presented in the following table:

20212020


(In thousands)		Amortized CostGross Unrealized
Gains		Gross Unrealized
Losses		Estimated Fair
Value		Amortized CostGross Unrealized
Gains		Gross Unrealized
Losses		Estimated Fair
Value
U.S. treasuries and government agencies$68,487 $202 $(150)$68,539 $42,750 $549 $(2)$43,297 
State and municipal323,286 6,561 (3,445)326,402 377,108 13,470 (211)390,367 
Mortgage-backed and asset-backed1,074,577 8,203 (11,825)1,070,955 881,201 24,078 (847)904,432 
Corporate debt— — — — 9,100 825 — 9,925 
Total investments available-for-sale$1,466,350 $14,966 $(15,420)$1,465,896 $1,310,159 $38,922 $(1,060)$1,348,021 
Gross Unrealized Losses and Fair Value by Length of Time
Gross unrealized losses and fair values by length of time that individual available-for-sale securities have been in an unrealized loss position at December 31 are presented in the following tables:

 December 31, 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 agencies5 $49,695 $150 $— $— $49,695 $150 
State and municipal32 63,206 2,288 21,740 1,157 84,946 3,445 
Mortgage-backed and asset-backed104 665,813 10,145 37,857 1,680 703,670 11,825 
Total141 $778,714 $12,583 $59,597 $2,837 $838,311 $15,420 

 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 
Estimated Fair Values of Debt Securities Available-for-sale by Contractual Maturity
The estimated fair values and amortized costs of debt securities available-for-sale by contractual maturity at December 31 are provided in the following table:

December 31, 2021December 31, 2020
(In thousands)Fair ValueAmortized CostFair ValueAmortized Cost
U.S. treasuries and government agencies:
One year or less$12,029 $11,995 $33,963 $33,833 
One to five years56,510 56,492 9,334 8,917 
Five to ten years— — — — 
After ten years— — — — 
State and municipal:
One year or less12,821 12,709 16,581 16,458 
One to five years27,408 26,637 44,910 43,857 
Five to ten years42,960 42,661 59,059 56,130 
After ten years243,213 241,279 269,817 260,663 
Mortgage-backed and asset-backed:
One year or less9,272 9,239 1 1 
One to five years14,752 14,575 21,637 21,229 
Five to ten years388,918 390,569 74,142 72,481 
After ten years658,013 660,194 808,652 787,490 
Corporate debt:
One year or less— — — — 
One to five years— — 2,318 2,100 
Five to ten years— — 7,607 7,000 
After ten years— — — — 
Total available-for-sale debt securities$1,465,896 $1,466,350 $1,348,021 $1,310,159 
Other Equity Securities
Other equity securities at the dates indicated are presented in the following table:
(In thousands)20212020
Federal Reserve Bank stock$34,097 $38,650 
Federal Home Loan Bank of Atlanta stock6,392 26,433 
Other equity securities677 677 
Total equity securities$41,166 $65,760 
Gross Realized Gains and Losses on All Investments
Gross realized gains and losses on all investments for the years ended December 31 are presented in the following table:

(In thousands)202120202019
Gross realized gains from sales of investments available-for-sale$3,588 $1,297 $14 
Gross realized losses from sales of investments available-for-sale(3,478)(1,068)(2)
Net gains from calls of investments available-for-sale102 238 65 
Net investment securities gains$212 $467 $77