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, 2022:
Assets
Derivative financial instruments	$	1,083,803	$	—	$	1,083,803	$	—
Loans held for sale		34,477		—		34,477		—
Trading securities		51,940		—		51,940		—
Securities available for sale:
U.S. Treasuries		264,425		—		264,425		—
U.S. Government agencies		218,623		—		218,623		—
Residential mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		1,730,067		—		1,730,067		—
Residential collateralized mortgage-obligations issued by U.S. government
agencies or sponsored enterprises		627,812		—		627,812		—
Commercial mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		1,027,776		—		1,027,776		—
State and municipal obligations		1,003,318		—		1,003,318		—
Small Business Administration loan-backed securities		464,236		—		464,236		—
Corporate securities		33,353		—		33,353		—
Total securities available for sale		5,369,610		—		5,369,610		—
Mortgage servicing rights		90,459		—		—		90,459
SBA servicing assets		6,981		—		—		6,981
	$	6,637,270	$	—	$	6,539,830	$	97,440
Liabilities
Derivative financial instruments	$	1,082,948	$	—	$	1,082,948	$	—

December 31, 2021:
Assets
Derivative financial instruments	$	414,742	$	—	$	414,742	$	—
Loans held for sale		191,723		—		191,723		—
Trading securities		77,689		—		77,689		—
Securities available for sale:
U.S. Government agencies		97,117		—		97,117		—
Residential mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		1,831,039		—		1,831,039		—
Residential collateralized mortgage-obligations issued by U.S. government
agencies or sponsored enterprises		725,995		—		725,995		—
Commercial mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		1,207,241		—		1,207,241		—
State and municipal obligations		812,689		—		812,689		—
Small Business Administration loan-backed securities		500,663		—		500,663		—
Corporate securities		18,734		—		18,734		—
Total securities available for sale		5,193,478		—		5,193,478		—
Mortgage servicing rights		65,620		—		—		65,620
	$	5,943,252	$	—	$	5,877,632	$	65,620
Liabilities
Derivative financial instruments	$	410,137	$	—	$	410,137	$	—

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, 2022:
OREO	$	2,160	$	—	$	—	$	2,160
Bank property held for sale		25,043		—		—		25,043
Individually evaluated loans		52,368		—		—		52,368
December 31, 2021:
OREO	$	2,736	$	—	$	—	$	2,736
Bank property held for sale		9,578		—		—		9,578
Individually evaluated loans		20,802		—		—		20,802

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, 2022
Financial assets:
Cash and cash equivalents	$	2,809,695	$	2,809,695	$	2,809,695	$	—	$	—
Trading securities		51,940		51,940		—		51,940		—
Investment securities		8,287,543		7,848,527		179,755		7,668,772		—
Loans held for sale		34,477		34,477		—		34,477		—
Loans, net of allowance for credit losses		28,511,905		28,271,062		—		—		28,271,062
Accrued interest receivable		124,553		124,553		—		28,508		96,045
Mortgage servicing rights		90,459		90,459		—		—		90,459
SBA servicing assets		6,981		—		—		—		6,981
Interest rate swap - non-designated hedge		1,081,768		1,081,768		—		1,081,768		—
Other derivative financial instruments (mortgage banking related)		2,035		2,035		—		2,035		—
Financial liabilities:
Deposits		37,666,021		37,578,773		—		37,578,773		—
Federal funds purchased and securities sold under agreements to repurchase		557,802		557,802		—		557,802		—
Other borrowings		392,368		379,992		—		379,992		—
Accrued interest payable		6,354		6,354		—		6,354		—
Interest rate swap - non-designated hedge		1,081,267		1,081,267		—		1,081,267		—
Other derivative financial instruments (mortgage banking related)		1,681		1,681		—		1,681		—
Off balance sheet financial instruments:
Commitments to extend credit		—		(92,429)		—		(92,429)		—
December 31, 2021
Financial assets:
Cash and cash equivalents	$	6,843,147	$	6,843,147	$	6,843,147	$	—	$	—
Trading securities		77,689		77,689		—		77,689		—
Investment securities		7,173,947		7,132,110		160,568		6,971,542		—
Loans held for sale		191,723		191,723		—		191,723		—
Loans, net of allowance for credit losses		23,626,359		23,921,372		—		—		23,921,372
Accrued interest receivable		90,069		90,069		—		19,241		70,828
Mortgage servicing rights		65,620		65,620		—		—		65,620
Interest rate swap - non-designated hedge		408,776		408,776		—		408,776		—
Other derivative financial instruments (mortgage banking related)		5,966		5,966		—		5,966		—
Financial liabilities:
Deposits		35,054,829		35,050,516		—		35,050,516		—
Federal funds purchased and securities sold under agreements to repurchase		781,239		781,239		—		781,239		—
Other borrowings		327,066		334,640		—		334,640		—
Accrued interest payable		3,345		3,345		—		3,345		—
Interest rate swap - non-designated hedge		410,137		410,137		—		410,137		—
Off balance sheet financial instruments:
Commitments to extend credit		—		93,501		—		93,501		—