FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Dec. 31, 2025

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table presents the balances of financial assets and liabilities measured at fair value on a recurring basis as of December 31, (dollars in thousands):

	Fair Value Measurements at 2025 using
			Significant
	Quoted Prices in		Other		Significant
	Active Markets for		Observable		Unobservable
	Identical Assets		Inputs		Inputs
	Level 1		Level 2		Level 3		Balance
ASSETS
AFS securities:
U.S. government and agency securities	$	88,946	$	15,056	$	—	$	104,002
Obligations of states and political subdivisions		—		487,885		—		487,885
Corporate and other bonds (1)		—		217,934		—		217,934
MBS		—		3,382,524		—		3,382,524
Other securities		—		1,956		—		1,956
LHFS		—		18,486		—		18,486
Financial Derivatives (2)		—		112,686		—		112,686
LIABILITIES
Financial Derivatives (2)	$	—	$	166,690	$	—	$	166,690

⁽¹⁾ Other bonds include asset-backed securities.

⁽²⁾ Includes hedged and non-hedged derivatives.

	Fair Value Measurements at 2024 using
			Significant
	Quoted Prices in		Other		Significant
	Active Markets for		Observable		Unobservable
	Identical Assets		Inputs		Inputs
	Level 1		Level 2		Level 3		Balance
ASSETS
AFS securities:
U.S. government and agency securities	$	62,199	$	3,814	$	—	$	66,013
Obligations of states and political subdivisions		—		468,337		—		468,337
Corporate and other bonds (1)		—		244,712		—		244,712
MBS		—		1,661,244		—		1,661,244
Other securities		—		1,860		—		1,860
LHFS		—		9,420		—		9,420
Financial Derivatives (2)		—		97,445		—		97,445
LIABILITIES
Financial Derivatives (2)	$	—	$	199,548	$	—	$	199,548

⁽¹⁾ Other bonds include asset-backed securities.

⁽²⁾ Includes hedged and non-hedged derivatives.

Schedule of Financial Assets Measured at Fair Value on Nonrecurring Basis

The following tables summarize the Company’s financial assets that were measured on a nonrecurring basis as of the periods ended (dollars in thousands):

	Fair Value Measurements at 2025 using
			Significant
	Quoted Prices in		Other		Significant
	Active Markets for		Observable		Unobservable
	Identical Assets		Inputs		Inputs
	Level 1		Level 2		Level 3		Balance
ASSETS
Individually assessed loans (1)	$	—	$	—	$	1,330	$	1,330

⁽¹⁾ Net of reserves of $203,000 related to collateral dependent loans as of December 31, 2025.

	Fair Value Measurements at 2024 using
			Significant
	Quoted Prices in		Other		Significant
	Active Markets for		Observable		Unobservable
	Identical Assets		Inputs		Inputs
	Level 1		Level 2		Level 3		Balance
ASSETS
Individually assessed loans (1)	$	—	$	—	$	14,636	$	14,636

⁽¹⁾ Net of reserves of $13.1 million related to collateral dependent loans as of December 31, 2024.

Carrying Values and Estimated Fair Values of the Company's Financial Instruments

The carrying values and estimated fair values of the Company’s financial instruments as of December 31, are as follows (dollars in thousands):

	Fair Value Measurements at 2025 using
			Quoted Prices		Significant
			in Active		Other		Significant
			Markets for		Observable		Unobservable		Total Fair
			Identical Assets		Inputs		Inputs		Value
	Carrying
	Value		Level 1		Level 2		Level 3		Balance
ASSETS
Cash and cash equivalents	$	966,462	$	966,462	$	—	$	—	$	966,462
AFS securities		4,194,301		88,946		4,105,355		—		4,194,301
HTM securities		884,216		—		855,906		906		856,812
Restricted stock		190,200		—		190,200		—		190,200
LHFS		18,486		—		18,486		—		18,486
LHFI, net of unearned income		27,796,167		—		—		27,517,137		27,517,137
Financial Derivatives (1)		112,686		—		112,686		—		112,686
Accrued interest receivable		131,741		—		131,741		—		131,741
BOLI		672,890		—		672,890		—		672,890
LIABILITIES
Deposits	$	30,471,636	$	—	$	30,467,372	$	—	$	30,467,372
Borrowings		1,497,292		—		1,435,699		—		1,435,699
Accrued interest payable		19,412		—		19,412		—		19,412
Financial Derivatives (1)		166,690		—		166,690		—		166,690

⁽¹⁾ Includes hedged and non-hedged derivatives.

	Fair Value Measurements at 2024 using
			Quoted Prices		Significant
			in Active		Other		Significant
			Markets for		Observable		Unobservable		Total Fair
			Identical Assets		Inputs		Inputs		Value
	Carrying
	Value		Level 1		Level 2		Level 3		Balance
ASSETS
Cash and cash equivalents	$	354,074	$	354,074	$	—	$	—	$	354,074
AFS securities		2,442,166		62,199		2,379,967		—		2,442,166
HTM securities		803,851		—		758,400		935		759,335
Restricted stock		102,954		—		102,954		—		102,954
LHFS		9,420		—		9,420		—		9,420
LHFI, net of unearned income		18,470,621		—		—		17,896,688		17,896,688
Financial Derivatives (1)		97,445		—		97,445		—		97,445
Accrued interest receivable		92,541		—		92,541		—		92,541
BOLI		493,396		—		493,396		—		493,396
LIABILITIES
Deposits	$	20,397,619	$	—	$	20,393,673	$	—	$	20,393,673
Borrowings		534,578		—		471,671		—		471,671
Accrued interest payable		26,214		—		26,214		—		26,214
Financial Derivatives (1)		199,548		—		199,548		—		199,548

⁽¹⁾ Includes hedged and non-hedged derivatives.