Schedule of recorded amount of assets and liabilities measured at fair value on a recurring basis


			Quoted Prices
			In Active		Significant
			Markets		Other		Significant
			for Identical		Observable		Unobservable
			Assets		Inputs		Inputs
(Dollars in thousands)	Fair Value		(Level 1)		(Level 2)		(Level 3)
September 30, 2025:
Assets
Derivative financial instruments	$	226,359	$	—	$	226,359	$	—
Mortgage loans held for sale		68,365		—		68,365		—
Trading securities		107,519		—		107,519		—
Securities available for sale:
Residential mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		1,550,365		—		1,550,365		—
Residential collateralized mortgage-obligations issued by U.S. government
agencies or sponsored enterprises		2,237,174		—		2,237,174		—
Commercial mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		675,612		—		675,612		—
State and municipal obligations		961,112		—		961,112		—
Small Business Administration loan-backed securities		591,560		—		591,560		—
Corporate securities		26,977		—		26,977		—
Total securities available for sale		6,042,800		—		6,042,800		—
Mortgage servicing rights		84,491		—		—		84,491
SBA servicing asset		5,659		—		—		5,659
	$	6,535,193	$	—	$	6,445,043	$	90,150
Liabilities
Derivative financial instruments	$	561,708	$	—	$	561,708	$	—

December 31, 2024:
Assets
Derivative financial instruments	$	161,490	$	—	$	161,490	$	—
Mortgage loans held for sale		98,115		—		98,115		—
Trading securities		102,932		—		102,932		—
Securities available for sale:
U.S. Treasuries		10,656		—		10,656		—
U.S. Government agencies		150,418		—		150,418		—
Residential mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		1,377,525		—		1,377,525		—
Residential collateralized mortgage-obligations issued by U.S. government
agencies or sponsored enterprises		459,095		—		459,095		—
Commercial mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		1,040,555		—		1,040,555		—
State and municipal obligations		945,723		—		945,723		—
Small Business Administration loan-backed securities		310,112		—		310,112		—
Corporate securities		26,509		—		26,509		—
Total securities available for sale		4,320,593		—		4,320,593		—
Mortgage servicing rights		89,795		—		—		89,795
SBA servicing asset		6,028		—		—		6,028
	$	4,778,953	$	—	$	4,683,130	$	95,823
Liabilities
Derivative financial instruments	$	879,855	$	—	$	879,855	$	—

Schedule of amounts of assets and liabilities measured at fair value on a nonrecurring basis


			Quoted Prices
			In Active		Significant
			Markets		Other		Significant
			for Identical		Observable		Unobservable
			Assets		Inputs		Inputs
(Dollars in thousands)	Fair Value		(Level 1)		(Level 2)		(Level 3)
September 30, 2025:
OREO	$	18,419	$	—	$	—	$	18,419
Bank properties held for sale		8,649		—		—		8,649
Individually evaluated loans		394,861		—		—		394,861
December 31, 2024:
OREO	$	2,154	$	—	$	—	$	2,154
Bank properties held for sale		3,268		—		—		3,268
Individually evaluated loans		71,112		—		—		71,112

Schedule of estimated fair value, and related carrying amount, of the Company's financial instruments


	Carrying		Fair
(Dollars in thousands)	Amount		Value		Level 1		Level 2		Level 3
September 30, 2025
Financial assets:
Cash and cash equivalents	$	3,144,455	$	3,144,455	$	3,144,455	$	—	$	—
Trading securities		107,519		107,519		—		107,519		—
Investment securities		8,505,745		8,174,505		274,883		7,808,287		91,335
Loans held for sale		346,673		349,462		—		349,462		—
Loans, net of allowance for credit losses		47,077,778		46,708,056		—		—		46,708,056
Accrued interest receivable		235,522		235,522		—		35,312		200,210
Mortgage servicing rights		84,491		84,491		—		—		84,491
SBA servicing asset		5,659		5,659		—		—		5,659
Interest rate swap – non-designated hedge		225,142		225,142		—		225,142		—
Other derivative financial instruments (mortgage banking related)		1,217		1,217		—		1,217		—
Financial liabilities:
Deposits
Noninterest-bearing		13,430,459		13,430,459		—		13,430,459		—
Interest-bearing other than time deposits		33,011,287		33,011,287		—		33,011,287		—
Time deposits		7,631,523		7,614,181		—		7,614,181		—
Federal funds purchased and securities sold under agreements to repurchase		594,092		594,092		—		594,092		—
Corporate and subordinated debentures		696,429		693,140		—		693,140		—
Other borrowings		—		—		—		—		—
Accrued interest payable		47,788		47,788		—		47,788		—
Interest rate swap – non-designated hedge		560,360		560,360		—		560,360		—
Other derivative financial instruments (mortgage banking related)		1,348		1,348		—		1,348		—
December 31, 2024
Financial assets:
Cash and cash equivalents	$	1,392,067	$	1,392,067	$	1,392,067	$	—	$	—
Trading securities		102,932		102,932		—		102,932		—
Investment securities		6,798,876		6,378,734		187,266		6,155,120		36,348
Loans held for sale		279,426		281,662		—		281,662		—
Loans, net of allowance for credit losses		33,437,647		32,448,618		—		—		32,448,618
Accrued interest receivable		163,402		163,402		—		25,035		138,367
Mortgage servicing rights		89,795		89,795		—		—		89,795
SBA servicing asset		6,028		6,028		—		—		6,028
Interest rate swap – non-designated hedge		160,407		160,407		—		160,407		—
Other derivative financial instruments (mortgage banking related)		1,083		1,083		—		1,083		—
Financial liabilities:
Deposits
Noninterest-bearing		10,192,117		10,192,117		—		10,192,117		—
Interest-bearing other than time deposits		23,703,027		23,703,027		—		23,703,027		—
Time deposits		4,165,722		4,145,687		—		4,145,687		—
Federal funds purchased and securities sold under agreements to repurchase		514,912		514,912		—		514,912		—
Corporate and subordinated debentures		391,534		377,616		—		377,616		—
Accrued interest payable		40,739		40,739		—		40,739		—
Interest rate swap – non-designated hedge		878,046		878,046		—		878,046		—
Other derivative financial instruments (mortgage banking related)		1,809		1,809		—		1,809		—

Schedule of reconciliation of the beginning and ending balances of Level 3 assets, comprised of Mortgage Servicing Rights, SBA servicing asset and liabilities recorded at fair value on a recurring basis


(Dollars in thousands)	MSRs
Fair value, January 1, 2025	$	89,795
Servicing assets that resulted from transfers of financial assets		5,912
Changes in fair value due to valuation inputs or assumptions		(5,182)
Changes in fair value due to decay		(6,034)
Fair value, September 30, 2025	$	84,491

Schedule of reconciliation of the beginning and ending balances of Level 3 assets, comprised of Mortgage Servicing Rights, SBA servicing asset and liabilities recorded at fair value on a recurring basis


(Dollars in thousands)	SBA Servicing Asset
Fair value, January 1, 2025	$	6,028
Servicing assets that resulted from transfers of financial assets		1,088
Changes in fair value due to decay		(1,546)
Changes in fair value due to valuation inputs or assumptions		89
Fair value, September 30, 2025	$	5,659