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FAIR VALUE MEASURES (Tables)
 12 Months Ended
Dec. 31, 2022
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:
December 31,
(dollars in thousands)20222021
Mortgage loans held for sale$390,583 $1,247,997 
SBA loans held for sale1,495 6,635 
Total loans held for sale$392,078 $1,254,632 
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 December 31, 2022 and 2021.
December 31,
(dollars in thousands)20222021
Aggregate fair value of mortgage loans held for sale$390,583 $1,247,997 
Aggregate unpaid principal balance of mortgage loans held for sale389,610 1,211,646 
Past due loans of 90 days or more— 746 
Nonaccrual loans— 746 
Unpaid principal balance of nonaccrual loans— 718 

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 December 31, 2022 and 2021.
December 31,
(dollars in thousands)20222021
Aggregate fair value of SBA loans held for sale$1,495 $6,635 
Aggregate unpaid principal balance of SBA loans held for sale1,350 5,825 
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 December 31, 2022 and 2021.
Recurring Basis
Fair Value Measurements
December 31, 2022
(dollars in thousands) Fair ValueLevel 1Level 2Level 3
Financial assets:
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 $— 
                                                                                                    
Recurring Basis
Fair Value Measurements
December 31, 2021
(dollars in thousands)Fair ValueLevel 1Level 2Level 3
Financial assets:
U.S. government-sponsored agencies$7,172 $— $7,172 $— 
State, county and municipal securities47,812 — 47,812 — 
Corporate debt securities28,496 — 27,116 1,380 
SBA pool securities45,201 — 45,201 — 
Mortgage-backed securities463,940 — 463,940 — 
Loans held for sale1,254,632 — 1,254,632 — 
Mortgage banking derivative instruments11,940 — 11,940 — 
Total recurring assets at fair value$1,859,193 $— $1,857,813 $1,380 
Financial liabilities:
Mortgage banking derivative instruments$710 $— $710 $— 
Total recurring liabilities at fair value$710 $— $710 $— 
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 December 31, 2022 and 2021.
Nonrecurring Basis
Fair Value Measurements
(dollars in thousands)Fair ValueLevel 1Level 2Level 3
December 31, 2022
Collateral-dependent loans$31,972 $— $— $31,972 
Total nonrecurring assets at fair value$31,972 $— $— $31,972 
December 31, 2021
Collateral-dependent loans$44,181 $— $— $44,181 
Mortgage servicing rights206,944 — — 206,944 
Total nonrecurring assets at fair value$251,125 $— $— $251,125 
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
Inputs		Range of DiscountsWeighted Average Discount
As of 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%
As of December 31, 2021
Recurring:
Debt securities available-for-sale$1,380 Discounted par valuesDiscount rate8%8%
Nonrecurring:
Collateral-dependent loans$44,181 Third-party appraisals and discounted cash flowsCollateral
discounts and discount rates
0% - 50%
39%
Mortgage servicing rights$206,944 Discounted cash flowsDiscount rate
9% - 10%
9%
Prepayment speed
10% - 40%
13%
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
December 31, 2022
(dollars in thousands)Carrying AmountLevel 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 
Fair Value Measurements
December 31, 2021
(dollars in thousands)Carrying AmountLevel 1Level 2Level 3Total
Financial assets:
Cash and due from banks$307,813 $307,813 $— $— $307,813 
Federal funds sold and interest-bearing accounts3,756,844 3,756,844 — — 3,756,844 
Time deposits in other banks— — — — — 
Loans, net15,662,495 — — 15,509,410 15,509,410 
Accrued interest receivable56,917 — 2,373 54,544 56,917 
Financial liabilities:
Deposits19,665,553 — 19,667,612 — 19,667,612 
Securities sold under agreements to repurchase5,845 5,845 — — 5,845 
Other borrowings739,879 — 760,829 — 760,829 
Subordinated deferrable interest debentures126,328 — 117,764 — 117,764 
Accrued interest payable4,313 — 4,313 — 4,313