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Investment Securities (Tables)
 12 Months Ended
Dec. 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 December 31, 2022 and December 31, 2021.
Amortized
Cost		Gross Unrealized
Gains		Gross Unrealized
Losses		Fair
Value
Available for sale at December 31, 2022
U.S. Treasury$2,501 $— $42 $2,459 
U.S. Government-sponsored agency securities119,154 — 17,192 101,962 
State and municipal1,530,048 438 178,726 1,351,760 
U.S. Government-sponsored mortgage-backed securities608,630 1 100,358 508,273 
Corporate obligations13,014 — 807 12,207 
Total available for sale$2,273,347 $439 $297,125 $1,976,661 
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 December 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 December 31, 2022
U.S. Government-sponsored agency securities$392,246 $— $392,246 $— $69,147 $323,099 
State and municipal1,117,552 245 1,117,307 647 197,064 921,135 
U.S. Government-sponsored mortgage-backed securities776,074 — 776,074 — 113,915 662,159 
Foreign investment1,500 — 1,500 — 28 1,472 
Total held to maturity$2,287,372 $245 $2,287,127 $647 $380,154 $1,907,865 


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 December 31, 2022, aggregated by credit quality indicator.
Held to Maturity
State and municipalOtherTotal
Credit Rating:
Aaa$101,076 $70,583 $171,659 
Aa1162,728 — 162,728 
Aa2185,394 — 185,394 
Aa3135,227 — 135,227 
A1131,417 — 131,417 
A210,168 — 10,168 
A310,117 — 10,117 
Non-rated381,425 1,099,237 1,480,662 
Total$1,117,552 $1,169,820 $2,287,372 
Schedule of Investment Securities in a Continuous Unrealized Loss Position
The following tables summarize, as of December 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 December 31, 2022
U.S. Treasury$2,459 $42 $— $— $2,459 $42 
U.S. Government-sponsored agency securities48,940 4,973 53,022 12,219 101,962 17,192 
State and municipal1,177,104 150,096 108,652 28,630 1,285,756 178,726 
U.S. Government-sponsored mortgage-backed securities182,700 16,910 325,455 83,448 508,155 100,358 
Corporate obligations12,176 807 — — 12,176 807 
Total investment securities available for sale$1,423,379 $172,828 $487,129 $124,297 $1,910,508 $297,125 

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 December 31, 2022
U.S. Treasury$42 5
U.S. Government-sponsored agency securities17,192 16
State and municipal178,726 946
U.S. Government-sponsored mortgage-backed securities100,358 177
Corporate obligations807 10
Total investment securities available for sale$297,125 1,154 

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.

December 31, 2022December 31, 2021
Investments available for sale reported at less than historical cost:
Historical cost$2,207,633 $658,858 
Fair value1,910,508 645,218 
Gross unrealized losses$297,125 $13,640 
Percent of the Corporation's investments available for sale96.7 %27.5 %
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 December 31, 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 December 31, 2022    
Due in one year or less$2,822 $2,809 $13,697 $13,749 
Due after one through five years11,694 11,265 80,697 76,453 
Due after five through ten years169,729 161,211 147,078 135,027 
Due after ten years1,480,472 1,293,103 1,269,826 1,020,477 
 1,664,717 1,468,388 1,511,298 1,245,706 
U.S. Government-sponsored mortgage-backed securities608,630 508,273 776,074 662,159 
Total Investment Securities$2,273,347 $1,976,661 $2,287,372 $1,907,865 

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.
202220212020
Sales and redemptions of investment securities available for sale:  
Gross gains$1,264 $6,502 $12,097 
Gross losses70 828 202 
Net gains of sales and redemptions of investment securities available for sale$1,194 $5,674 $11,895