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)
June 30, 2022:
Assets
Derivative financial instruments	$	668,324	$	—	$	668,324	$	—
Loans held for sale		73,880		—		73,880		—
Trading securities		88,088		—		88,088		—
Securities available for sale:
U.S. Treasuries		316,458		—		316,458		—
U.S. Government agencies		203,087		—		203,087		—
Residential mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		1,860,009		—		1,860,009		—
Residential collateralized mortgage-obligations issued by U.S. government
agencies or sponsored enterprises		667,514		—		667,514		—
Commercial mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		1,065,822		—		1,065,822		—
State and municipal obligations		1,068,558		—		1,068,558		—
Small Business Administration loan-backed securities		454,952		—		454,952		—
Corporate securities		29,608		—		29,608		—
Total securities available for sale		5,666,008		—		5,666,008		—
Mortgage servicing rights		87,463		—		—		87,463
SBA servicing assets		6,449		—		—		6,449
	$	6,590,212	$	—	$	6,496,300	$	93,912
Liabilities
Derivative financial instruments	$	666,802	$	—	$	666,802	$	—

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)
June 30, 2022:
OREO	$	1,431	$	—	$	—	$	1,431
Bank property held for sale		5,692		—		—		5,692
Individually evaluated loans		33,095		—		—		33,095
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
June 30, 2022
Financial assets:
Cash and cash equivalents	$	4,722,099	$	4,722,099	$	4,722,099	$	—	$	—
Trading securities		88,088		88,088		—		88,088		—
Investment securities		8,652,288		8,338,509		179,815		8,158,694		—
Loans held for sale		73,880		73,880		—		73,880		—
Loans, net of allowance for credit losses		27,615,558		27,644,893		—		—		27,644,893
Accrued interest receivable		109,995		109,995		—		27,601		82,394
Mortgage servicing rights		87,463		87,463		—		—		87,463
SBA servicing assets		6,449		—		—		—		6,449
Interest rate swap - non-designated hedge		666,470		666,470		—		666,470		—
Other derivative financial instruments (mortgage banking related)		1,854		1,854		—		1,854		—
Financial liabilities:
Deposits		38,875,851		38,813,989		—		38,813,989		—
Federal funds purchased and securities sold under agreements to repurchase		669,999		669,999		—		669,999		—
Other borrowings		392,460		375,593		—		375,593		—
Accrued interest payable		4,192		4,192		—		4,192		—
Interest rate swap - non-designated hedge		666,503		666,503		—		666,503		—
Other derivative financial instruments (mortgage banking related)		299		299		—		299		—
Off balance sheet financial instruments:
Commitments to extend credit		—		10,888		—		10,888		—
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		—