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INVESTMENTS (Tables)
 3 Months Ended
Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost and Estimated Fair Values of Investments
The amortized cost and estimated fair values of investments available-for-sale and held-to-maturity at the dates indicated are presented in the following table:
 March 31, 2022December 31, 2021
(In thousands)Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value		Amortized
Cost		Gross
Unrealized
Gains		Gross
Unrealized
Losses		Estimated
Fair
Value
Available-for-sale debt securities:
U.S. treasuries and government agencies$109,364 $26 $(3,892)$105,498 $68,487 $202 $(150)$68,539 
State and municipal347,877 274 (26,298)321,853 323,286 6,561 (3,445)326,402 
Mortgage-backed and asset-backed869,089 304 (36,799)832,594 1,074,577 8,203 (11,825)1,070,955 
Total available-for-sale debt securities$1,326,330 $604 $(66,989)$1,259,945 $1,466,350 $14,966 $(15,420)$1,465,896 
Held-to-maturity debt securities:
Mortgage-backed and asset-backed285,339 — (9,505)275,834 — — — — 
Total held-to-maturity debt securities$285,339 $— $(9,505)$275,834 $— $— $— $— 
Total debt securities$1,611,669 $604 $(76,494)$1,535,779 $1,466,350 $14,966 $(15,420)$1,465,896 
Schedule of Gross Unrealized Losses and Fair Value by Length of Time in Unrealized Loss Position
Gross unrealized losses and fair value by length of time that the individual available-for-sale debt securities have been in an unrealized loss position at the dates indicated are presented in the following tables:
 March 31, 2022
 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 agencies9 $89,548 $3,892 $— $— $89,548 $3,892 
State and municipal114 225,812 18,281 36,982 8,017 262,794 26,298 
Mortgage-backed and asset-backed244 783,283 35,867 13,669 932 796,952 36,799 
Total367 $1,098,643 $58,040 $50,651 $8,949 $1,149,294 $66,989 

 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 
Estimated fair values of debt securities by contractual maturity
The estimated fair values and amortized costs of available-for-sale and held-to-maturity debt securities by contractual maturity at the dates indicated are provided in the following tables.

March 31, 2022December 31, 2021
(In thousands)Fair ValueAmortized CostFair ValueAmortized Cost
Available-for-sale debt securities
U.S. treasuries and government agencies:
One year or less$8,991 $8,997 $12,029 $11,995 
One to five years96,507 100,367 56,510 56,492 
Five to ten years— — — — 
After ten years— — — — 
State and municipal:
One year or less12,421 12,358 12,821 12,709 
One to five years53,025 53,539 27,408 26,637 
Five to ten years39,651 41,698 42,960 42,661 
After ten years216,756 240,282 243,213 241,279 
Mortgage-backed and asset-backed:
One year or less10,263 10,283 9,272 9,239 
One to five years8,095 8,212 14,752 14,575 
Five to ten years336,206 351,404 388,918 390,569 
After ten years478,030 499,190 658,013 660,194 
Total available-for-sale debt securities$1,259,945 $1,326,330 $1,465,896 $1,466,350 
March 31, 2022December 31, 2021
(In thousands)Fair ValueAmortized CostFair ValueAmortized Cost
Held-to-maturity debt securities
Mortgage-backed and asset-backed:
One year or less$— $— $— $— 
One to five years— — — — 
Five to ten years42,043 43,004 — — 
After ten years233,791 242,335 — — 
Total held-to-maturity debt securities$275,834 $285,339 $— $— 
Summary of Other Equity Securities
Other equity securities at the dates indicated are presented in the following table:
(In thousands)March 31, 2022December 31, 2021
Federal Reserve Bank stock$34,187 $34,097 
Federal Home Loan Bank of Atlanta stock6,293 6,392 
Marketable equity securities677 677 
Total equity securities$41,157 $41,166