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FAIR VALUES OF FINANCIAL INSTRUMENTS (Tables)
 6 Months Ended
Jun. 30, 2024
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 fair value hierarchy in which the fair value measurements fall at June 30, 2024, and December 31, 2023.

  Fair Value Measurements Using:
June 30, 2024Fair 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. Government-sponsored agency securities$91,277 $— $91,277 $— 
State and municipal1,024,907 — 1,021,718 3,189 
U.S. Government-sponsored mortgage-backed securities490,654 — 490,650 4 
Corporate obligations12,055 — 12,024 31 
Derivative assets87,777 — 87,777 — 
Derivative liabilities87,236 — 87,236 — 


  Fair Value Measurements Using:
December 31, 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. Government-sponsored agency securities$95,307 $— $95,307 $— 
State and municipal1,065,171 — 1,061,896 3,275 
U.S. Government-sponsored mortgage-backed securities454,815 — 454,811 4 
Corporate obligations11,819 — 11,788 31 
Derivative assets79,379 — 79,379 — 
Derivative liabilities79,008 — 79,008 — 
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 six months ended June 30, 2024 and 2023.
 Available for Sale Securities
Three Months EndedSix Months Ended
 June 30, 2024June 30, 2023June 30, 2024June 30, 2023
Balance at beginning of the period$3,247 $3,462 $3,310 $3,439 
Included in other comprehensive income(21)(111)11 3 
Principal payments(2)(3)(97)(94)
Ending balance $3,224 $3,348 $3,224 $3,348 
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 June 30, 2024, and December 31, 2023.
  Fair Value Measurements Using
June 30, 2024Fair ValueQuoted Prices in
Active Markets for
Identical Assets
(Level 1)		Significant Other
Observable
Inputs
(Level 2)		Significant Unobservable
Inputs
(Level 3)
Collateral dependent loans$30,988 $— $— $30,988 


  Fair Value Measurements Using
December 31, 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$55,020 $— $— $55,020 
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 June 30, 2024 and December 31, 2023.

June 30, 2024Fair ValueValuation TechniqueUnobservable InputsRange (Weighted-Average)
State and municipal securities$3,189 Discounted cash flowMaturity/Call date
1 month to 6 years
   US Muni BQ curve
BBB
   Discount rate
3.7% - 4.6%
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$30,988 Collateral based measurementsDiscount to reflect current market conditions and ultimate collectability
0% - 25%
  Weighted-average discount by loan balance
21.8%

December 31, 2023Fair ValueValuation TechniqueUnobservable InputsRange (Weighted-Average)
State and municipal securities$3,275 Discounted cash flowMaturity/Call date
1 month to 15 years
   US Muni BQ curve
A- to BBB
   Discount rate
3.6% - 4.7%
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$55,020 Collateral based measurementsDiscount to reflect current market conditions and ultimate collectability
0% - 10%
Weighted-average discount by loan balance
4.1%
Summary of Estimated Fair Values of Financial Instruments
The following tables present 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 June 30, 2024 and December 31, 2023.

June 30, 2024
 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$105,372 $105,372 $— $— $105,372 
Interest-bearing deposits168,528 168,528 — — 168,528 
Investment securities available for sale1,618,893 — 1,615,669 3,224 1,618,893 
Investment securities held to maturity, net2,134,195 — 1,771,567 7,649 1,779,216 
Loans held for sale32,292 — 32,292 — 32,292 
Loans, net12,450,113 — — 12,121,987 12,121,987 
Federal Home Loan Bank stock41,738 — 41,738 — 41,738 
Derivative assets87,777 — 87,777 — 87,777 
Interest receivable97,546 — 97,546 — 97,546 
Liabilities:    
Deposits$14,569,070 $12,096,840 $2,460,291 $— 14,557,131 
Borrowings:  
Federal funds purchased147,229 — 147,229 — 147,229 
Securities sold under repurchase agreements100,451 — 100,451 — 100,451 
Federal Home Loan Bank advances832,703 — 822,958 — 822,958 
Subordinated debentures and other borrowings93,589 — 84,091 — 84,091 
Derivative liabilities87,236 — 87,236 — 87,236 
Interest payable18,554 — 18,554 — 18,554 

December 31, 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$112,649 $112,649 $— $— $112,649 
Interest-bearing deposits436,080 436,080 — — 436,080 
Investment securities available for sale1,627,112 — 1,623,802 3,310 1,627,112 
Investment securities held to maturity, net2,184,252 — 1,859,974 10,400 1,870,374 
Loans held for sale18,934 — 18,934 — 18,934 
Loans, net12,281,093 — — 11,958,301 11,958,301 
Federal Home Loan Bank stock41,769 — 41,769 — 41,769 
Derivative assets79,379 — 79,379 — 79,379 
Interest receivable97,664 — 97,664 — 97,664 
Liabilities:
Deposits$14,821,453 $12,482,295 $2,329,662 $— 14,811,957 
Borrowings:
Securities sold under repurchase agreements157,280 — 157,265 — 157,265 
Federal Home Loan Bank advances712,852 — 707,377 — 707,377 
Subordinated debentures and other borrowings158,644 — 149,995 — 149,995 
Derivative liabilities79,008 — 79,008 — 79,008 
Interest payable18,912 — 18,912 — 18,912