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FAIR VALUE MEASURES (Tables)
 9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Schedule of Loans Held For Sale Fair Value
The Company's loans held for sale under the fair value option are comprised of the following:

(dollars in thousands)September 30, 2023December 31, 2022
Mortgage loans held for sale$381,466 $390,583 
SBA loans held for sale— 1,495 
Total loans held for sale$381,466 $392,078 
Schedule of Difference Between Fair Value and Principal Balance for Mortgage Loans Held for Sale Measured at Fair Value
The following table summarizes the difference between the fair value and the principal balance for mortgage loans held for sale measured at fair value as of September 30, 2023 and December 31, 2022:

(dollars in thousands) 
September 30, 2023December 31, 2022
Aggregate fair value of mortgage loans held for sale$381,466 $390,583 
Aggregate unpaid principal balance of mortgage loans held for sale381,350 389,610 
Past-due loans of 90 days or more475 — 
Nonaccrual loans475 — 
Unpaid principal balance of nonaccrual loans470 — 
The following table summarizes the difference between the fair value and the principal balance for SBA loans held for sale measured at fair value as of September 30, 2023 and December 31, 2022:

(dollars in thousands) 
September 30, 2023December 31, 2022
Aggregate fair value of SBA loans held for sale$— $1,495 
Aggregate unpaid principal balance of SBA loans held for sale— 1,350 
Past-due loans of 90 days or more— — 
Nonaccrual loans— — 
Schedule of Fair Value Measurements of Assets and Liabilities Measured on Recurring Basis
The following table presents the fair value measurements of assets and liabilities measured at fair value on a recurring basis and the level within the fair value hierarchy in which the fair value measurements fall as of September 30, 2023 and December 31, 2022:

Recurring Basis
Fair Value Measurements
 September 30, 2023
(dollars in thousands) 
Fair ValueLevel 1Level 2Level 3
Financial assets:    
Investment securities available-for-sale:
U.S. Treasuries$760,596 $760,596 $— $— 
U.S. government sponsored agencies969 — 969 — 
State, county and municipal securities27,703 — 27,703 — 
Corporate debt securities15,036 — 14,061 975 
SBA pool securities21,751 — 21,751 — 
Mortgage-backed securities598,026 — 598,026 — 
Loans held for sale381,466 — 381,466 — 
Derivative financial instruments13,199 — 13,199 — 
Mortgage banking derivative instruments8,809 — 8,809 — 
Total recurring assets at fair value$1,827,555 $760,596 $1,065,984 $975 
Financial liabilities:    
Derivative financial instruments$12,988 $— $12,988 $— 
Total recurring liabilities at fair value$12,988 $— $12,988 $— 

Recurring Basis
Fair Value Measurements
 December 31, 2022
(dollars in thousands)Fair ValueLevel 1Level 2Level 3
Financial assets:    
Investment securities available-for-sale:
U.S. Treasuries$759,534 $759,534 $— $— 
U.S. government sponsored agencies979 — 979 — 
State, county and municipal securities34,195 — 34,195 — 
Corporate debt securities15,926 — 14,771 1,155 
SBA pool securities27,398 — 27,398 — 
Mortgage-backed securities662,028 — 662,028 — 
Loans held for sale392,078 — 392,078 — 
Derivative financial instruments4,580 — 4,580 — 
Mortgage banking derivative instruments3,933 — 3,933 — 
Total recurring assets at fair value$1,900,651 $759,534 $1,139,962 $1,155 
Financial liabilities:    
Derivative financial instruments$4,574 $— $4,574 $— 
Total recurring liabilities at fair value$4,574 $— $4,574 $— 
Schedule of Fair Value Measurements of Assets Measured at Fair Value on Non-Recurring Basis
The following table presents the fair value measurements of assets measured at fair value on a non-recurring basis, as well as the general classification of such instruments pursuant to the valuation hierarchy as of September 30, 2023 and December 31, 2022:

 Nonrecurring Basis
Fair Value Measurements
(dollars in thousands)Fair ValueLevel 1Level 2Level 3
September 30, 2023    
Collateral-dependent loans$26,656 $— $— $26,656 
Other real estate owned1,606 — — 1,606 
Total nonrecurring assets at fair value$28,262 $— $— $28,262 
December 31, 2022    
Collateral-dependent loans$31,972 $— $— $31,972 
Total nonrecurring assets at fair value$31,972 $— $— $31,972 
Schedule of Significant Unobservable Inputs Used in Fair Value Measurement of Level 3 Assets and Liabilities
The following table shows significant unobservable inputs used in the fair value measurement of Level 3 assets:

(dollars in thousands)Fair ValueValuation
Technique		Unobservable InputsRange of
Discounts		Weighted
Average
Discount
September 30, 2023     
Recurring:     
Debt securities available-for-sale$975 Discounted cash flowsProbability of Default12.2%12.2%
Loss Given Default44%44%
Nonrecurring:     
Collateral-dependent loans$26,656 Third-party appraisals and discounted cash flowsCollateral discounts and
discount rates
5% - 50%
30%
Other real estate owned$1,606 Third-party appraisals and sales contractsCollateral discounts and estimated
costs to sell
15% - 46%
26%
December 31, 2022     
Recurring:     
Debt securities available-for-sale$1,155 Discounted cash flowsProbability of Default12.1%12.1%
Loss Given Default41%41%
Nonrecurring:   
Collateral-dependent loans$31,972 Third-party appraisals and discounted cash flowsCollateral discounts and
discount rates
0% - 48%
27%
Schedule of Carrying Amount and Estimated Fair Value of Financial Instruments
The carrying amount and estimated fair value of the Company’s financial instruments, not shown elsewhere in these financial statements, were as follows:

Fair Value Measurements
  September 30, 2023
(dollars in thousands)Carrying
Amount		Level 1Level 2Level 3Total
Financial assets:     
Cash and due from banks$241,137 $241,137 $— $— $241,137 
Federal funds sold and interest-bearing accounts1,304,636 1,304,636 — — 1,304,636 
Debt securities held-to-maturity141,859 — 115,689 — 115,689 
Loans, net19,884,319 — — 19,247,521 19,247,521 
Accrued interest receivable83,574 — 9,264 74,311 83,575 
Financial liabilities:     
Deposits20,590,345 — 20,579,194 — 20,579,194 
Other borrowings1,209,553 — 1,189,399 — 1,189,399 
Subordinated deferrable interest debentures129,817 — 141,206 — 141,206 
Accrued interest payable38,836 — 38,836 — 38,836 

Fair Value Measurements
  December 31, 2022
(dollars in thousands)Carrying
Amount		Level 1Level 2Level 3Total
Financial assets:     
Cash and due from banks$284,567 $284,567 $— $— $284,567 
Federal funds sold and interest-bearing accounts833,565 833,565 — — 833,565 
Debt securities held-to-maturity134,864 — 114,538 114,538 
Loans, net19,617,604 — — 19,067,612 19,067,612 
Accrued interest receivable77,042 — 7,694 69,348 77,042 
Financial liabilities:     
Deposits19,462,738 — 19,455,187 — 19,455,187 
Other borrowings1,875,736 — 1,861,850 — 1,861,850 
Subordinated deferrable interest debentures128,322 — 125,988 — 125,988 
Accrued interest payable10,530 — 10,530 — 10,530