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)
December 31, 2023:
Assets
Derivative financial instruments	$	172,939	$	—	$	172,939	$	—
Loans held for sale		50,888		—		50,888		—
Trading securities		31,321		—		31,321		—
Securities available for sale:
U.S. Treasuries		73,890		—		73,890		—
U.S. Government agencies		224,706		—		224,706		—
Residential mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		1,558,306		—		1,558,306		—
Residential collateralized mortgage-obligations issued by U.S. government
agencies or sponsored enterprises		527,422		—		527,422		—
Commercial mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		1,024,170		—		1,024,170		—
State and municipal obligations		977,461		—		977,461		—
Small Business Administration loan-backed securities		371,686		—		371,686		—
Corporate securities		26,747		—		26,747		—
Total securities available for sale		4,784,388		—		4,784,388		—
Mortgage servicing rights		85,164		—		—		85,164
SBA servicing asset		5,952		—		—		5,952
	$	5,130,652	$	—	$	5,039,536	$	91,116
Liabilities
Derivative financial instruments	$	804,486	$	—	$	804,486	$	—

December 31, 2022:
Assets
Derivative financial instruments	$	211,016	$	—	$	211,016	$	—
Loans held for sale		28,968		—		28,968		—
Trading securities		31,263		—		31,263		—
Securities available for sale:
U.S. Treasuries		265,638		—		265,638		—
U.S. Government agencies		219,088		—		219,088		—
Residential mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		1,698,353		—		1,698,353		—
Residential collateralized mortgage-obligations issued by U.S. government
agencies or sponsored enterprises		601,045		—		601,045		—
Commercial mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		1,000,398		—		1,000,398		—
State and municipal obligations		1,064,852		—		1,064,852		—
Small Business Administration loan-backed securities		444,810		—		444,810		—
Corporate securities		32,638		—		32,638		—
Total securities available for sale		5,326,822		—		5,326,822		—
Mortgage servicing rights		86,610		—		—		86,610
SBA servicing asset		6,068		—		—		6,068
	$	5,690,747	$	—	$	5,598,069	$	92,678
Liabilities
Derivative financial instruments	$	1,034,143	$	—	$	1,034,143	$	—

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)
December 31, 2023:
OREO	$	837	$	—	$	—	$	837
Bank properties held for sale		12,401		—		—		12,401
Individually evaluated loans		73,518		—		—		73,518
December 31, 2022:
OREO	$	1,023	$	—	$	—	$	1,023
Bank properties held for sale		17,754		—		—		17,754
Individually evaluated loans		56,719		—		—		56,719

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
December 31, 2023
Financial assets:
Cash and cash equivalents	$	998,877	$	998,877	$	998,877	$	—	$	—
Trading securities		31,321		31,321		—		31,321		—
Investment securities		7,463,871		7,061,167		192,043		6,869,124		—
Loans held for sale		50,888		50,888		—		50,888		—
Loans, net of allowance for credit losses		31,931,916		30,709,513		—		—		30,709,513
Accrued interest receivable		154,400		154,400		—		26,706		127,694
Mortgage servicing rights		85,164		85,164		—		—		85,164
SBA servicing asset		5,952		5,952		—		—		5,952
Interest rate swap – non-designated hedge		169,180		169,180		—		169,180		—
Other derivative financial instruments (mortgage banking related)		3,759		3,759		—		3,759		—
Financial liabilities:
Deposits
Noninterest-bearing		10,649,274		10,649,274		—		10,649,274		—
Interest-bearing other than time deposits		22,149,682		22,149,682		—		22,149,682		—
Time deposits		4,249,953		4,208,498		—		4,208,498
Federal funds purchased and securities sold under agreements to repurchase		489,185		489,185		—		489,185		—
Corporate and subordinated debentures		391,904		388,909		—		388,909		—
Other borrowings		100,000		100,000		—		100,000		—
Accrued interest payable		56,808		56,808		—		56,808		—
Interest rate swap – non-designated hedge		803,539		803,539		—		803,539		—
Other derivative financial instruments (mortgage banking related)		947		947		—		947		—
December 31, 2022
Financial assets:
Cash and cash equivalents	$	1,312,563	$	1,312,563	$	1,312,563	$	—	$	—
Trading securities		31,263		31,263		—		31,263		—
Investment securities		8,189,780		7,756,707		179,717		7,576,990		—
Loans held for sale		28,968		28,968		—		28,968		—
Loans, net of allowance for credit losses		29,821,418		29,329,499		—		—		29,329,499
Accrued interest receivable		134,594		134,594		—		28,449		106,145
Mortgage servicing rights		86,610		86,610		—		—		86,610
SBA servicing asset		6,068		—		—		—		6,068
Interest rate swap – non-designated hedge		210,216		210,216		—		210,216		—
Other derivative financial instruments (mortgage banking related)		800		800		—		800		—
Financial liabilities:
Deposits
Noninterest-bearing		13,168,656		13,168,656		—		13,168,656		—
Interest-bearing other than time deposits		20,761,981		20,761,981		—		20,761,981		—
Time deposits		2,419,986		2,333,764		—		2,333,764
Federal funds purchased and securities sold under agreements to repurchase		556,417		556,417		—		556,417		—
Corporate and subordinated debentures		392,275		377,360		—		377,360		—
Accrued interest payable		6,218		6,218		—		6,218		—
Interest rate swap – non-designated hedge		1,033,980		1,033,980		—		1,033,980		—
Other derivative financial instruments (mortgage banking related)		163		163		—		163		—

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, 2023	$	86,610
Servicing assets that resulted from transfers of financial assets		8,444
Changes in fair value due to valuation inputs or assumptions		(1,350)
Changes in fair value due to decay		(8,540)
Fair value, December 31, 2023	$	85,164

Fair value, January 1, 2022	$	65,620
Servicing assets that resulted from transfers of financial assets		16,002
Changes in fair value due to valuation inputs or assumptions		14,886
Changes in fair value due to decay		(9,898)
Fair value, December 31, 2022	$	86,610

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, 2023	$	6,068
Servicing assets that resulted from transfers of financial assets		1,621
Changes in fair value due to decay		(2,244)
Changes in fair value due to valuation inputs or assumptions		507
Fair value, December 31, 2023	$	5,952

Beginning Balance, June 30, 2022	$	7,369
Servicing assets that resulted from transfers of financial assets		1,273
Changes in fair value due to decay		(1,845)
Changes in fair value due to valuation inputs or assumptions		(729)
Fair value, December 31, 2022	$	6,068