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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2021
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 December 31, 2021 and December 31, 2020.
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 


Amortized
Cost		Gross Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
Available for sale at December 31, 2020
U.S. Government-sponsored agency securities$43,437 $1,571 $— $45,008 
State and municipal1,168,711 89,420 246 1,257,885 
U.S. Government-sponsored mortgage-backed securities591,210 20,984 103 612,091 
Corporate obligations4,031 104 — 4,135 
Total available for sale$1,807,389 $112,079 $349 $1,919,119 


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 December 31, 2021 and December 31, 2020.

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 


Amortized
Cost		Allowance for Credit LossesNet Carrying AmountGross Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
Held to maturity at December 31, 2020
U.S. Government-sponsored agency securities$145,398 $— $145,398 $347 $220 $145,525 
State and municipal619,927 — 619,927 34,978 32 654,873 
U.S. Government-sponsored mortgage-backed securities460,843 — 460,843 17,552 — 478,395 
Foreign investment1,500 — 1,500 — — 1,500 
Total held to maturity$1,227,668 $— $1,227,668 $52,877 $252 $1,280,293 
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 December 31, 2021, aggregated by credit quality.
Held to Maturity
State and municipalOtherTotal
Credit Rating:
Aaa$90,290 $60,579 $150,869 
Aa1152,666 — 152,666 
Aa2175,755 — 175,755 
Aa3130,640 — 130,640 
A188,281 — 88,281 
A227,364 — 27,364 
A310,108 — 10,108 
Baa2265 — 265 
Non-rated381,932 1,062,167 1,444,099 
Total$1,057,301 $1,122,746 $2,180,047 
Schedule of Allowance for Credit Losses on Investment Securities Held to Maturity
The following table details activity in the allowance for credit losses on investment securities held to maturity during the twelve months ended December 31, 2021.

State and municipal
Allowance for Credit Losses:
Balance, December 31, 2020$— 
Impact of adopting ASC 326245 
Provision for credit loss— 
Securities charged off— 
Recoveries on securities— 
Balance, December 31, 2021$245 
Schedule of Investment Securities in a Continuous Unrealized Loss Position
The following tables summarize, as of December 31, 2021 and December 31, 2020, 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 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 

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, 2020
State and municipal$5,368 $246 $— $— $5,368 $246 
U.S. Government-sponsored mortgage-backed securities9,651 103 — — 9,651 103 
Total investment securities available for sale$15,019 $349 $— $— $15,019 $349 

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 in an unrealized loss position for the periods indicated.
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 sale13,640 161


Gross
Unrealized
Losses		Number of Securities
Investment securities available for sale at December 31, 2020
State and municipal$246 4
U.S. Government-sponsored mortgage-backed securities$103 5
Total investment securities available for sale$349 9
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.

December 31, 2021December 31, 2020
Investments available for sale reported at less than historical cost:
Historical cost$658,858 $15,368 
Fair value645,218 15,019 
Gross unrealized losses$13,640 $349 
Percent of the Corporation's investments available for sale27.5 %0.8 %
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 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 available for sale securities for the years indicated are shown below.
202120202019
Sales and Redemptions of Available for Sale Securities:  
Gross gains$6,502 $12,097 $4,415 
Gross losses828 202 —