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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of Amortized Cost, Gross Unrealized Gains, 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 March 31, 2022 and December 31, 2021.

 Amortized
Cost		Gross Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
Available for sale at March 31, 2022    
U.S. Treasury$1,964 $— $5 $1,959 
U.S. Government-sponsored agency securities85,494 7 6,403 79,098 
State and municipal1,543,969 17,890 65,326 1,496,533 
U.S. Government-sponsored mortgage-backed securities629,999 305 47,780 582,524 
Corporate obligations4,031 76 24 4,083 
Total available for sale$2,265,457 $18,278 $119,538 $2,164,197 

 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 March 31, 2022 and December 31, 2021.

Amortized
Cost		Allowance for Credit LossesNet Carrying AmountGross Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
Held to maturity at March 31, 2022    
U.S. Government-sponsored agency securities$400,126 $— $400,126 $— $29,998 $370,128 
State and municipal1,082,257 245 1,082,012 5,718 105,731 982,244 
U.S. Government-sponsored mortgage-backed securities841,428 — 841,428 979 50,285 792,122 
Foreign investment1,500 — 1,500 — — 1,500 
Total held to maturity$2,325,311 $245 $2,325,066 $6,697 $186,014 $2,145,994 


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 
Schedule 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 March 31, 2022, aggregated by credit quality indicator.
Held to Maturity
State and municipalOtherTotal
Credit Rating:
Aaa$96,155 $60,580 $156,735 
Aa1152,330 — 152,330 
Aa2174,021 — 174,021 
Aa3130,579 — 130,579 
A1105,264 — 105,264 
A230,114 — 30,114 
A310,110 — 10,110 
Non-rated383,684 1,182,474 1,566,158 
Total$1,082,257 $1,243,054 $2,325,311 
Schedule of Investment Securities in a Continuous Unrealized Loss Position
The following tables summarize, as of March 31, 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 March 31, 2022
U.S. Treasury$1,959 $5 $— $— $1,959 $5 
U.S. Government-sponsored agency securities54,473 3,775 23,869 2,628 78,342 6,403 
State and municipal887,898 62,732 16,888 2,594 904,786 65,326 
U.S. Government-sponsored mortgage-backed securities284,223 16,380 265,203 31,400 549,426 47,780 
Corporate obligations976 24 — — 976 24 
Total investment securities available for sale$1,229,529 $82,916 $305,960 $36,622 $1,535,489 $119,538 

 
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 March 31, 2022
U.S. Treasury$5 2
U.S. Government-sponsored agency securities6,403 13
State and municipal65,326 585
U.S. Government-sponsored mortgage-backed securities47,780 120
Corporate obligations24 1
Total investment securities available for sale$119,538 721
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
Schedule 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.
March 31, 2022December 31, 2021
Investments available for sale reported at less than historical cost:  
Historical cost$1,655,027 $658,858 
Fair value1,535,489 645,218 
Gross unrealized losses$119,538 $13,640 
Percent of the Corporation's investments available for sale71.0 %27.5 %
Amortized Cost and Fair Value of Available for Sale Securities and Held to Maturity Securities by Contractual Maturity
 Available for SaleHeld to Maturity
 Amortized CostFair ValueAmortized CostFair Value
Maturity Distribution at March 31, 2022    
Due in one year or less$6,240 $6,189 $7,718 $7,737 
Due after one through five years6,106 6,128 30,156 30,777 
Due after five through ten years135,605 135,384 179,256 173,697 
Due after ten years1,487,507 1,433,972 1,266,753 1,141,661 
 1,635,458 1,581,673 1,483,883 1,353,872 
U.S. Government-sponsored mortgage-backed securities629,999 582,524 841,428 792,122 
Total investment securities$2,265,457 $2,164,197 $2,325,311 $2,145,994 
 
 
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 
Schedule of Gross Gains 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 months ended March 31, 2022 and 2021 are shown below.
Three Months Ended
March 31,
20222021
Sales and redemptions of investment securities available for sale:  
Gross gains$578 $2,076 
Gross losses12 277 
Net gains on sales and redemptions of investment securities available for sale$566 $1,799