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FAIR VALUE - Fair Value (Detail) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Assets:        
Investment securities available for sale $ 5,589,256 $ 5,599,520    
Held To Maturity Securities Amortized 431,395 437,537    
Less: allowance for credit losses on held to maturity securities (7,646) (8,286)    
Investment securities held to maturity, net of ACL 423,749 429,251    
ACL for loans and finance leases (265,567) (260,464) $ (245,447) $ (269,030)
Loans held for investment, net of ACL 11,312,418 11,292,361    
Mortgage servicing rights 28,431 29,037 $ 30,753 $ 30,986
Advances from the FHLB:        
Short-term 425,000 475,000    
Long-term 500,000 200,000    
Other long-term borrowings 183,762 183,762    
Carrying Reported Amount Fair Value Disclosure [Member]        
Assets:        
Cash and due from banks and money market investments 823,601 480,505    
Investment securities available for sale 5,589,256 5,599,520    
Held To Maturity Securities Amortized 431,395 437,537    
Less: allowance for credit losses on held to maturity securities (7,646) (8,286)    
Investment securities held to maturity, net of ACL 423,749 429,251    
Equity Securities 61,788 50,428    
Other investment securities 4,926 4,861    
Loans held for sale 15,183 12,306    
Total gross loans held for investment portfolio 11,577,985 11,552,825    
ACL for loans and finance leases (265,567) (260,464)    
Loans held for investment, net of ACL 11,312,418 11,292,361    
Mortgage servicing rights 28,431 29,037    
Derivative Assets 628 633    
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]        
Deposits 16,051,965 16,143,467    
Short-term securities sold under agreements to repurchase (amortized cost) 172,982 75,133    
Advances from the FHLB:        
Short-term 425,000 475,000    
Long-term 500,000 200,000    
Other long-term borrowings 183,762 183,762    
Derivative Liabilities 645 476    
Federal Home Loan Bank Stock 54,200 42,900    
Estimate Of Fair Value Fair Value Disclosure [Member]        
Assets:        
Cash and due from banks and money market investments 823,601 480,505    
Investment securities available for sale 5,589,256 5,599,520    
Investment securities held to maturity, net of ACL 419,752 427,115    
Equity Securities 61,788 50,428    
Other investment securities 4,926 4,861    
Loans held for sale 15,214 12,306    
Loans held for investment, net of ACL 11,030,421 11,106,809    
Mortgage servicing rights 45,270 44,710    
Derivative Assets 628 633    
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]        
Deposits 16,039,550 16,139,937    
Short-term securities sold under agreements to repurchase (amortized cost) 173,936 75,230    
Advances from the FHLB:        
Short-term 426,665 474,731    
Long-term 501,990 199,865    
Other long-term borrowings 187,183 187,246    
Derivative Liabilities 645 476    
Estimate Of Fair Value Fair Value Disclosure [Member] | Fair Value Inputs Level 1 [Member]        
Assets:        
Cash and due from banks and money market investments 823,601 480,505    
Investment securities available for sale 140,422 138,875    
Investment securities held to maturity, net of ACL 0 0    
Equity Securities 0 0    
Other investment securities 4,926 4,861    
Loans held for sale 0 0    
Loans held for investment, net of ACL 0 0    
Mortgage servicing rights 0 0    
Derivative Assets 0 0    
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]        
Deposits 0 0    
Short-term securities sold under agreements to repurchase (amortized cost) 0 0    
Advances from the FHLB:        
Short-term 0 0    
Long-term 0 0    
Other long-term borrowings 0 0    
Derivative Liabilities 0 0    
Estimate Of Fair Value Fair Value Disclosure [Member] | Fair Value Inputs Level 2 [Member]        
Assets:        
Cash and due from banks and money market investments 0 0    
Investment securities available for sale 5,441,229 5,452,150    
Investment securities held to maturity, net of ACL 255,209 260,106    
Equity Securities 61,788 50,428    
Other investment securities 0 0    
Loans held for sale 15,214 12,306    
Loans held for investment, net of ACL 0 0    
Mortgage servicing rights 0 0    
Derivative Assets 628 633    
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]        
Deposits 16,039,550 16,139,937    
Short-term securities sold under agreements to repurchase (amortized cost) 173,936 75,230    
Advances from the FHLB:        
Short-term 426,665 474,731    
Long-term 501,990 199,865    
Other long-term borrowings 0 0    
Derivative Liabilities 645 476    
Estimate Of Fair Value Fair Value Disclosure [Member] | Fair Value Inputs Level 3 [Member]        
Assets:        
Cash and due from banks and money market investments 0 0    
Investment securities available for sale 7,605 8,495    
Investment securities held to maturity, net of ACL 164,543 167,009    
Equity Securities 0 0    
Other investment securities 0 0    
Loans held for sale 0 0    
Loans held for investment, net of ACL 11,030,421 11,106,809    
Mortgage servicing rights 45,270 44,710    
Derivative Assets 0 0    
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]        
Deposits 0 0    
Short-term securities sold under agreements to repurchase (amortized cost) 0 0    
Advances from the FHLB:        
Short-term 0 0    
Long-term 0 0    
Other long-term borrowings 187,183 187,246    
Derivative Liabilities $ 0 $ 0