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, 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	$	—

December 31, 2020:
Assets
Derivative financial instruments	$	813,899	$	—	$	813,899	$	—
Loans held for sale		290,467		—		290,467		—
Trading securities		10,674		—		10,674		—
Securities available for sale:
U.S. Government agencies		29,256		—		29,256		—
Residential mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		1,367,132		—		1,367,132		—
Residential collateralized mortgage-obligations issued by U.S. government
agencies or sponsored enterprises		755,551		—		755,551		—
Commercial mortgage-backed securities issued by U.S. government
agencies or sponsored enterprises		240,108		—		240,108		—
State and municipal obligations		520,039		—		520,039		—
Small Business Administration loan-backed securities		404,884		—		404,884		—
Corporate securities		13,702		—		13,702		—
Total securities available for sale		3,330,672		—		3,330,672		—
Mortgage servicing rights		43,820		—		—		43,820
	$	4,489,532	$	—	$	4,445,712	$	43,820
Liabilities
Derivative financial instruments	$	804,832	$	—	$	804,832	$	—

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, 2021:
OREO	$	2,736	$	—	$	—	$	2,736
Bank property held for sale		9,578		—		—		9,578
Individually evaluated loans		20,802		—		—		20,802
December 31, 2020:
OREO	$	11,914	$	—	$	—	$	11,914
Bank property held for sale		36,006		—		—		36,006
Individually evaluated loans		17,609		—		—		17,609

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, 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		—
December 31, 2020
Financial assets:
Cash and cash equivalents	$	4,609,255	$	4,609,255	$	4,609,255	$	—	$	—
Trading securities		10,674		10,674		—		10,674		—
Investment securities		4,446,657		4,448,300		160,443		4,287,857		—
Loans held for sale		290,467		290,467		—		290,467		—
Loans, net of allowance for credit losses		24,206,825		24,757,859		—		—		24,757,859
Accrued interest receivable		107,601		107,601		—		12,952		94,649
Mortgage servicing rights		43,820		43,820		—		—		43,820
Interest rate swap - non-designated hedge		802,763		802,763		—		802,763		—
Other derivative financial instruments (mortgage banking related)		11,136		11,136		—		11,136		—
Financial liabilities:
Deposits		30,693,882		30,719,416		—		30,719,416		—
Federal funds purchased and securities sold under agreements to repurchase		779,666		779,666		—		779,666		—
Other borrowings		390,179		386,126		—		386,126		—
Accrued interest payable		7,103		7,103		—		7,103		—
Interest rate swap - non-designated hedge		804,832		804,832		—		804,832		—
Off balance sheet financial instruments:
Commitments to extend credit		—		136,726		—		136,726		—