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INVESTMENTS (Tables)
 9 Months Ended
Sep. 30, 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:
 September 30, 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$100,740 $— $(7,935)$92,805 $68,487 $202 $(150)$68,539 
State and municipal342,492 5 (65,558)276,939 323,286 6,561 (3,445)326,402 
Mortgage-backed and asset-backed968,111 94 (93,614)874,591 1,074,577 8,203 (11,825)1,070,955 
Total available-for-sale debt securities$1,411,343 $99 $(167,107)$1,244,335 $1,466,350 $14,966 $(15,420)$1,465,896 
Held-to-maturity debt securities:
Mortgage-backed and asset-backed265,648 — (39,618)226,030 — — — — 
Total held-to-maturity debt securities$265,648 $— $(39,618)$226,030 $— $— $— $— 
Total debt securities$1,676,991 $99 $(206,725)$1,470,365 $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:
 September 30, 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 agencies10 $88,079 $7,672 $4,724 $263 $92,803 $7,935 
State and municipal160 222,651 42,761 52,441 22,797 275,092 65,558 
Mortgage-backed and asset-backed328 635,793 61,543 214,757 32,071 850,550 93,614 
Total498 $946,523 $111,976 $271,922 $55,131 $1,218,445 $167,107 

 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 are provided in the following tables.

September 30, 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$— $— $12,029 $11,995 
One to five years92,805 100,740 56,510 56,492 
Five to ten years— — — — 
After ten years— — — — 
State and municipal:
One year or less4,297 4,306 12,821 12,709 
One to five years68,727 71,754 27,408 26,637 
Five to ten years31,787 37,090 42,960 42,661 
After ten years172,128 229,342 243,213 241,279 
Mortgage-backed and asset-backed:
One year or less5,602 5,639 9,272 9,239 
One to five years48,806 50,257 14,752 14,575 
Five to ten years318,785 353,118 388,918 390,569 
After ten years501,398 559,097 658,013 660,194 
Total available-for-sale debt securities$1,244,335 $1,411,343 $1,465,896 $1,466,350 
September 30, 2022December 31, 2021
(In thousands)Fair ValueAmortized CostFair ValueAmortized Cost
Held-to-maturity debt securities
Mortgage-backed and asset-backed:
One year or less$— $— $— $— 
One to five years— — — — 
Five to ten years36,205 40,229 — — 
After ten years189,825 225,419 — — 
Total held-to-maturity debt securities$226,030 $265,648 $— $— 
Summary of Other Equity Securities
Other investments are presented in the following table:
(In thousands)September 30, 2022December 31, 2021
Federal Reserve Bank stock, at cost$38,826 $34,097 
Federal Home Loan Bank of Atlanta stock, at cost37,793 6,392 
Other677 677 
Other investments$77,296 $41,166