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FAIR VALUE - Fair Value (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Assets:            
Investment securities available for sale $ 5,668,689   $ 6,453,761      
Held To Maturity Securities Amortized 445,862          
Less: allowance for credit losses on held to maturity securities (8,257)   (8,571)      
Debt securities held to maturity, net of allowance 437,605   169,562      
Less: ACL for loans and finance leases (257,859) $ (252,152) (269,030) $ (288,360) $ (324,958) $ (385,887)
Loans held for investment, net of ACL 11,040,759   10,791,628      
Mortgage servicing rights 29,690 $ 30,277 30,986 $ 31,685 $ 32,335 $ 33,071
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]            
Other borrowings 183,762   183,762      
Carrying Reported Amount Fair Value Disclosure [Member]            
Assets:            
Cash and due from banks and money market investments 554,990   2,543,058      
Investment securities available for sale 5,668,689   6,453,761      
Held To Maturity Securities Amortized 445,862   178,133      
Less: allowance for credit losses on held to maturity securities (8,257)   (8,571)      
Debt securities held to maturity, net of allowance 437,605   169,562      
Equity Securities 19,803   26,791      
Other investment securities 4,924   5,378      
Loans held for sale 12,169   35,155      
Total gross loans held for investment portfolio 11,298,618   11,060,658      
Less: ACL for loans and finance leases (257,859)   (269,030)      
Loans held for investment, net of ACL 11,040,759   10,791,628      
Mortgage servicing rights 29,690   30,986      
Derivative Assets 1,212   1,505      
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]            
Deposits 16,569,581   17,784,894      
Securities sold under agreements to repurchase 200,000   300,000      
Advances from FHLB     200,000      
Other borrowings 183,762   183,762      
Derivative Liabilities 452   1,178      
Federal Home Loan Bank Stock 12,300   21,500      
Estimate Of Fair Value Fair Value Disclosure [Member]            
Assets:            
Cash and due from banks and money market investments 554,990   2,543,058      
Investment securities available for sale 5,668,689   6,453,761      
Debt securities held to maturity, net of allowance 429,530   167,147      
Equity Securities 19,803   26,791      
Other investment securities 4,924   5,378      
Loans held for sale 12,169   36,147      
Loans held for investment, net of ACL 10,986,720   10,900,400      
Mortgage servicing rights 44,621   42,132      
Derivative Assets 1,212   1,505      
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]            
Deposits 16,553,140   17,800,706      
Securities sold under agreements to repurchase 202,510   322,105      
Advances from FHLB     202,044      
Other borrowings 181,761   177,689      
Derivative Liabilities 452   1,178      
Estimate Of Fair Value Fair Value Disclosure [Member] | Fair Value Inputs Level 1 [Member]            
Assets:            
Cash and due from banks and money market investments 554,990   2,543,058      
Investment securities available for sale 138,258   148,486      
Debt securities held to maturity, net of allowance 0   0      
Equity Securities 0   0      
Other investment securities 4,924   5,378      
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      
Securities sold under agreements to repurchase 0   0      
Advances from FHLB     0      
Other 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 5,521,568   6,294,191      
Debt securities held to maturity, net of allowance 268,552   0      
Equity Securities 19,803   26,791      
Other investment securities 0   0      
Loans held for sale 12,169   36,147      
Loans held for investment, net of ACL 0   0      
Mortgage servicing rights 0   0      
Derivative Assets 1,212   1,505      
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]            
Deposits 16,553,140   17,800,706      
Securities sold under agreements to repurchase 202,510   322,105      
Advances from FHLB     202,044      
Other borrowings 0   0      
Derivative Liabilities 452   1,178      
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 8,863   11,084      
Debt securities held to maturity, net of allowance 160,978   167,147      
Equity Securities 0   0      
Other investment securities 0   0      
Loans held for sale 0   0      
Loans held for investment, net of ACL 10,986,720   10,900,400      
Mortgage servicing rights 44,621   42,132      
Derivative Assets 0   0      
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]            
Deposits 0   0      
Securities sold under agreements to repurchase 0   0      
Advances from FHLB     0      
Other borrowings 181,761   177,689      
Derivative Liabilities $ 0   $ 0