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INVESTMENT SECURITIES (Tables)
 9 Months Ended
Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Summary of Amortized Cost, Gross Unrealized Gains and Losses, Gross Unrealized Losses and Approximate Fair Value of Investment Securities
The following table summarizes the amortized cost, gross unrealized gains and losses and approximate fair value of investment securities available for sale as of September 30, 2022 and December 31, 2021.

 Amortized
Cost		Gross Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
Available for sale at September 30, 2022    
U.S. Treasury$2,107 $— $40 $2,067 
U.S. Government-sponsored agency securities121,907 — 16,141 105,766 
State and municipal1,611,859 93 266,996 1,344,956 
U.S. Government-sponsored mortgage-backed securities627,583 1 108,795 518,789 
Corporate obligations13,036 — 642 12,394 
Total available for sale$2,376,492 $94 $392,614 $1,983,972 

 Amortized
Cost		Gross Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
Available for sale at December 31, 2021    
U.S. Treasury$1,000 $— $1 $999 
U.S. Government-sponsored agency securities96,244 437 1,545 95,136 
State and municipal1,495,696 81,734 898 1,576,532 
U.S. Government-sponsored mortgage-backed securities671,684 7,109 11,188 667,605 
Corporate obligations4,031 256 8 4,279 
Total available for sale$2,268,655 $89,536 $13,640 $2,344,551 


The following table summarizes the amortized cost, gross unrealized gains and losses, approximate fair value and allowance for credit losses on investment securities held to maturity as of September 30, 2022 and December 31, 2021.

Amortized
Cost		Allowance for Credit LossesNet Carrying AmountGross Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
Held to maturity at September 30, 2022   
U.S. Government-sponsored agency securities$399,089 $— $399,089 $— $66,514 $332,575 
State and municipal1,114,312 245 1,114,067 113 256,834 857,591 
U.S. Government-sponsored mortgage-backed securities796,140 — 796,140 — 120,709 675,431 
Foreign investment1,500 — 1,500 — 9 1,491 
Total held to maturity$2,311,041 $245 $2,310,796 $113 $444,066 $1,867,088 


Amortized
Cost		Allowance for Credit LossesNet Carrying AmountGross Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
Held to maturity at December 31, 2021    
U.S. Government-sponsored agency securities$371,457 $— $371,457 $226 $7,268 $364,415 
State and municipal1,057,301 245 1,057,056 29,593 2,170 1,084,724 
U.S. Government-sponsored mortgage-backed securities749,789 — 749,789 7,957 5,881 751,865 
Foreign investment1,500 — 1,500 — 1 1,499 
Total held to maturity$2,180,047 $245 $2,179,802 $37,776 $15,320 $2,202,503 
Summary of Amortized Cost of Investment Securities Held to Maturity Aggregated by Credit Quality Indicator
On a quarterly basis, the Corporation monitors the credit quality of investment securities held to maturity through the use of credit ratings. The following table summarizes the amortized cost of investment securities held to maturity at September 30, 2022, aggregated by credit quality indicator.
Held to Maturity
State and municipalOtherTotal
Credit Rating:
Aaa$101,372 $70,582 $171,954 
Aa1162,890 — 162,890 
Aa2185,511 — 185,511 
Aa3135,285 — 135,285 
A1131,413 — 131,413 
A210,167 — 10,167 
A310,115 — 10,115 
Non-rated377,559 1,126,147 1,503,706 
Total$1,114,312 $1,196,729 $2,311,041 
Summary of Investment Securities in a Continuous Unrealized Loss Position
The following tables summarize, as of September 30, 2022 and December 31, 2021, investment securities available for sale in an unrealized loss position for which an allowance for credit losses has not been recorded, aggregated by security type and length of time in a continuous unrealized loss position.
Less than 12 Months12 Months or LongerTotal
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
Investment securities available for sale at September 30, 2022
U.S. Treasury$2,067 $40 $— $— $2,067 $40 
U.S. Government-sponsored agency securities67,039 7,453 38,727 8,688 105,766 16,141 
State and municipal1,229,682 234,780 90,765 32,216 1,320,447 266,996 
U.S. Government-sponsored mortgage-backed securities206,559 23,141 312,109 85,654 518,668 108,795 
Corporate obligations12,363 642 — — 12,363 642 
Total investment securities available for sale$1,517,710 $266,056 $441,601 $126,558 $1,959,311 $392,614 

 
Less than 12 Months12 Months or LongerTotal
Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses		Fair
Value		Gross
Unrealized
Losses
Investment securities available for sale at December 31, 2021
U.S. Treasury$999 $1 $— $— $999 $1 
U.S. Government-sponsored agency securities68,524 1,545 — — 68,524 1,545 
State and municipal138,187 894 505 4 138,692 898 
U.S. Government-sponsored mortgage-backed securities427,687 10,791 8,324 397 436,011 11,188 
Corporate obligations992 8 — — 992 8 
Total investment securities available for sale$636,389 $13,239 $8,829 $401 $645,218 $13,640 


The following table summarizes investment securities available for sale in an unrealized loss position for which an allowance for credit losses has not been recorded, aggregated by security type and the number of securities in the portfolio for the periods indicated.

Gross
Unrealized
Losses		Number of Securities
Investment securities available for sale at September 30, 2022
U.S. Treasury$40 4
U.S. Government-sponsored agency securities16,141 17
State and municipal266,996 1074
U.S. Government-sponsored mortgage-backed securities108,795 176
Corporate obligations642 10
Total investment securities available for sale$392,614 1,281 

Gross
Unrealized
Losses		Number of Securities
Investment securities available for sale at December 31, 2021
U.S. Treasury$1 1
U.S. Government-sponsored agency securities1,545 8
State and municipal898 103
U.S. Government-sponsored mortgage-backed securities11,188 48
Corporate obligations8 1
Total investment securities available for sale$13,640 161
Summary of Investments in Debt and Equity Securities Reported in the Financial Statements at an Amount Less Than Their Historical Cost
Certain investment securities available for sale are reported in the financial statements at an amount less than their historical cost as indicated in the table below.
September 30, 2022December 31, 2021
Investments available for sale reported at less than historical cost:  
Historical cost$2,351,925 $658,858 
Fair value1,959,311 645,218 
Gross unrealized losses$392,614 $13,640 
Percent of the Corporation's investments available for sale98.8 %27.5 %
Summary of Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities by Contractual Maturity
The amortized cost and fair value of investment securities available for sale and held to maturity at September 30, 2022 and December 31, 2021, by contractual maturity are shown below. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity are shown separately.
 Available for SaleHeld to Maturity
 Amortized CostFair ValueAmortized CostFair Value
Maturity Distribution at September 30, 2022    
Due in one year or less$4,646 $4,617 $6,428 $6,439 
Due after one through five years14,329 13,776 71,303 67,777 
Due after five through ten years176,931 161,885 156,564 139,284 
Due after ten years1,553,003 1,284,905 1,280,606 978,157 
 1,748,909 1,465,183 1,514,901 1,191,657 
U.S. Government-sponsored mortgage-backed securities627,583 518,789 796,140 675,431 
Total investment securities$2,376,492 $1,983,972 $2,311,041 $1,867,088 

Available for SaleHeld to Maturity
Amortized CostFair ValueAmortized CostFair Value
Maturity Distribution at December 31, 2021    
Due in one year or less$6,954 $6,965 $6,971 $6,995 
Due after one through five years5,097 5,309 30,272 31,946 
Due after five through ten years120,460 126,816 177,203 180,129 
Due after ten years1,464,460 1,537,856 1,215,812 1,231,568 
 1,596,971 1,676,946 1,430,258 1,450,638 
U.S. Government-sponsored mortgage-backed securities671,684 667,605 749,789 751,865 
Total investment securities$2,268,655 $2,344,551 $2,180,047 $2,202,503 
Summary of Gross Gains and Losses on Sales and Redemptions of Available for Sale Securities
Gross gains and losses on the sales and redemptions of investment securities available for sale for the three and nine months ended September 30, 2022 and 2021 are shown below.
Three Months Ended
September 30,		Nine Months Ended
September 30,
2022202120222021
Sales and redemptions of investment securities available for sale:    
Gross gains$495 $1,915 $1,176 $5,814 
Gross losses14 159 39 498 
Net gains on sales and redemptions of investment securities available for sale$481 $1,756 $1,137 $5,316