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FAIR VALUES OF FINANCIAL INSTRUMENTS (Tables)
 9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Summary of Fair Value Measurements of Assets and Liabilities Recognized in the Balance Sheets Measured at Fair Value on Recurring Basis
The following table presents the fair value measurements of assets and liabilities recognized in the accompanying balance sheets measured at fair value on a recurring basis and the level within the ASC 820-10 fair value hierarchy in which the fair value measurements fall at September 30, 2023, and December 31, 2022.

  Fair Value Measurements Using:
September 30, 2023Fair ValueQuoted Prices in Active Markets for Identical Assets
(Level 1)		Significant Other
Observable Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Available for sale securities:    
U.S. Treasury$1,713 $1,713 $— $— 
U.S. Government-sponsored agency securities93,585 — 93,585 — 
State and municipal973,056 — 969,863 3,193 
U.S. Government-sponsored mortgage-backed securities419,963 — 419,959 4 
Corporate obligations11,819 — 11,788 31 
Derivative assets114,541 — 114,541 — 
Derivative liabilities114,014 — 114,014 — 

  Fair Value Measurements Using:
December 31, 2022Fair ValueQuoted Prices in
Active Markets for
Identical Assets
(Level 1)		Significant Other Observable Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Available for sale securities:    
U.S. Treasury$2,459 $2,459 $— $— 
U.S. Government-sponsored agency securities101,962 — 101,962 — 
State and municipal1,351,760 — 1,348,356 3,404 
U.S. Government-sponsored mortgage-backed securities508,273 — 508,269 4 
Corporate obligations12,207 — 12,176 31 
Derivative assets93,036 — 93,036 — 
Derivative liabilities92,770 — 92,770 — 
Summary of Reconciliation of Beginning and Ending Balances of Recurring Fair Value Measurements Recognized in the Balance Sheets using Significant Unobservable Level 3 Inputs
The following is a reconciliation of the beginning and ending balances of recurring fair value measurements recognized in the accompanying
balance sheets using significant unobservable Level 3 inputs for the three and nine months ended September 30, 2023 and 2022.
 Available for Sale Securities
Three Months EndedNine Months Ended
 September 30, 2023September 30, 2022September 30, 2023September 30, 2022
Balance at beginning of the period$3,348 $8,630 $3,439 $5,491 
Included in other comprehensive income(30)29 (28)(597)
Purchases, issuances and settlements— — — 5,111 
Principal payments(90)(3,152)(183)(4,498)
Ending balance $3,228 $5,507 $3,228 $5,507 
Summary of Description of Valuation Methodologies Used for Instruments Measured at Fair Value on a Non-Recurring Basis and Recognized in the Balance Sheets
Following is a description of valuation methodologies used for instruments measured at fair value on a nonrecurring basis and recognized in the accompanying balance sheets, as well as the general classification of such instruments pursuant to the valuation hierarchy at September 30, 2023, and December 31, 2022.
  Fair Value Measurements Using
September 30, 2023Fair ValueQuoted Prices in
Active Markets for
Identical Assets
(Level 1)		Significant Other
Observable
Inputs
(Level 2)		Significant Unobservable
Inputs
(Level 3)
Collateral dependent loans$50,607 $— $— $50,607 
Other real estate owned362 — — 362 
  Fair Value Measurements Using
December 31, 2022Fair ValueQuoted Prices in
Active Markets for
Identical Assets
(Level 1)		Significant Other
Observable
 Inputs
(Level 2)		Significant Unobservable
Inputs
(Level 3)
Collateral dependent loans$55,290 $— $— $55,290 
Summary of Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements Other than Goodwill
The following tables present quantitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements, other than goodwill, at September 30, 2023 and December 31, 2022.

September 30, 2023Fair ValueValuation TechniqueUnobservable InputsRange (Weighted-Average)
State and municipal securities$3,193 Discounted cash flowMaturity/Call date
1 month to 15 years
   US Muni BQ curve
BBB
   Discount rate
4.2% - 5.1%
Weighted-average coupon
3.3%
Corporate obligations and U.S. Government-sponsored mortgage-backed securities$35 Discounted cash flowRisk free rate
3 month CME Term SOFR plus 26bps
   plus premium for illiquidity (basis points)
plus 200bps
Weighted-average coupon
0%
Collateral dependent loans$50,607 Collateral based measurementsDiscount to reflect current market conditions and ultimate collectability
0% - 10%
  Weighted-average discount by loan balance
4.8%
Other real estate owned$362 AppraisalsDiscount to reflect current market conditions
0% - 10%
Weighted-average discount of other real estate owned balance
7.2%
December 31, 2022Fair ValueValuation TechniqueUnobservable InputsRange (Weighted-Average)
State and municipal securities$3,404 Discounted cash flowMaturity/Call date
1 month to 15 years
   US Muni BQ curve
A- to BBB
   Discount rate
0.4% - 4%
Weighted-average coupon
3.4%
Corporate obligations and U.S. Government-sponsored mortgage-backed securities$35 Discounted cash flowRisk free rate
3 month LIBOR
   plus premium for illiquidity (basis points)
plus 200bps
Weighted-average coupon
0%
Collateral dependent loans$55,290 Collateral based measurementsDiscount to reflect current market conditions and ultimate collectability
0% - 10%
Weighted-average discount by loan balance
1.1%
Summary of Estimated Fair Values of Financial Instruments
The following table presents estimated fair values of the Corporation’s financial instruments and the level within the fair value hierarchy in which the fair value measurements fall at September 30, 2023 and December 31, 2022.
September 30, 2023
 Quoted Prices in Active Markets
for Identical
Assets		Significant
Other
Observable
Inputs		Significant Unobservable
Inputs
 Carrying Amount(Level 1)(Level 2)(Level 3)Total Fair Value
Assets:    
Cash and due from banks$125,173 $125,173 $— $— $125,173 
Interest-bearing deposits348,639 348,639 — — 348,639 
Investment securities available for sale1,500,136 1,713 1,495,195 3,228 1,500,136 
Investment securities held to maturity, net2,213,588 — 1,730,830 10,395 1,741,225 
Loans held for sale30,972 — 30,972 — 30,972 
Loans, net12,065,640 — — 11,801,546 11,801,546 
Federal Home Loan Bank stock41,797 — 41,797 — 41,797 
Derivative assets114,541 — 114,541 — 114,541 
Interest receivable90,011 — 90,011 — 90,011 
Liabilities:    
Deposits$14,646,576 $12,524,202 $2,104,703 $— 14,628,905 
Borrowings:  
Securities sold under repurchase agreements152,537 — 152,523 — 152,523 
Federal Home Loan Bank advances713,384 — 695,425 — 695,425 
Subordinated debentures and other borrowings158,665 — 135,847 — 135,847 
Derivative liabilities114,014 — 114,014 — 114,014 
Interest payable16,473 — 16,473 — 16,473 
December 31, 2022
 Quoted Prices in Active Markets
for Identical
Assets		Significant
Other
Observable
Inputs		Significant Unobservable
Inputs
 Carrying Amount(Level 1)(Level 2)(Level 3)Total Fair Value
Assets:    
Cash and due from banks$122,594 $122,594 $— $— $122,594 
Interest-bearing deposits126,061 126,061 — — 126,061 
Investment securities available for sale1,976,661 2,459 1,970,763 3,439 1,976,661 
Investment securities held to maturity, net2,287,127 — 1,893,271 14,594 1,907,865 
Loans held for sale9,094 — 9,094 — 9,094 
Loans, net11,780,617 — — 11,156,217 11,156,217 
Federal Home Loan Bank stock38,525 — 38,525 — 38,525 
Derivative assets93,036 — 93,036 — 93,036 
Interest receivable85,070 — 85,070 — 85,070 
Liabilities:
Deposits$14,382,745 $13,105,936 $1,251,017 $— 14,356,953 
Borrowings:
Federal funds purchased171,560 — 171,560 — 171,560 
Securities sold under repurchase agreements167,413 — 167,396 — 167,396 
Federal Home Loan Bank advances823,674 — 615,211 — 615,211 
Subordinated debentures and other borrowings151,298 — 122,102 — 122,102 
Derivative liabilities92,770 — 92,770 — 92,770 
Interest payable7,530 — 7,530 — 7,530