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FAIR VALUE - Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Assets:
Investment securities available for sale	$ 6,424,660	$ 6,453,761
Less: allowance for credit losses on held to maturity securities	(12,324)	(8,571)
Investment securities held to maturity, net of ACL	165,735	169,562
Total gross loans held for investment portfolio	11,100
Less: ACL for loans and finance leases	(245,447)	(269,030)	$ (358,936)	$ (385,887)
Loans held for investment, net of ACL	10,852,258	10,791,628
Mortgage servicing rights	30,753	30,986	$ 32,710	$ 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	1,696,249	2,543,058
Investment securities available for sale	6,424,660	6,453,761
Held To Maturity Securities Amortized	178,059	178,133
Less: allowance for credit losses on held to maturity securities	(12,324)	(8,571)
Investment securities held to maturity, net of ACL	165,735	169,562
Equity Securities	32,014	32,169
Loans held for sale	27,905	35,155
Total gross loans held for investment portfolio	11,097,705	11,060,658
Less: ACL for loans and finance leases	(245,447)	(269,030)
Loans held for investment, net of ACL	10,852,258	10,791,628
Mortgage servicing rights	30,753	30,986
Derivative Assets	1,170	1,505
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]
Deposits	17,335,403	17,784,894
Securities sold under agreements to repurchase	200,000	300,000
Advances from FHLB	200,000	200,000
Other borrowings	183,762	183,762
Derivative Liabilities	822	1,178
Estimate Of Fair Value Fair Value Disclosure [Member]
Assets:
Cash and due from banks and money market investments	1,696,249	2,543,058
Investment securities available for sale	6,424,660	6,453,761
Investment securities held to maturity, net of ACL	168,814	167,147
Equity Securities	32,014	32,169
Loans held for sale	27,600	36,147
Loans held for investment, net of ACL	10,954,163	10,900,400
Mortgage servicing rights	43,037	42,132
Derivative Assets	1,170	1,505
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]
Deposits	17,351,115	17,800,706
Securities sold under agreements to repurchase	212,544	322,105
Advances from FHLB	200,766	202,044
Other borrowings	180,698	177,689
Derivative Liabilities	822	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	1,696,249	2,543,058
Investment securities available for sale	142,749	148,486
Investment securities held to maturity, net of ACL	0	0
Equity Securities	5,202	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	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	6,271,264	6,294,191
Investment securities held to maturity, net of ACL	0	0
Equity Securities	26,812	26,791
Loans held for sale	27,600	36,147
Loans held for investment, net of ACL	0	0
Mortgage servicing rights	0	0
Derivative Assets	1,170	1,505
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]
Deposits	17,351,115	17,800,706
Securities sold under agreements to repurchase	212,544	322,105
Advances from FHLB	200,766	202,044
Other borrowings		0
Derivative Liabilities	822	1,178
Federal Home Loan Bank Stock	21,500	21,500
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	10,647	11,084
Investment securities held to maturity, net of ACL	168,814	167,147
Equity Securities	0	0
Loans held for sale	0	0
Loans held for investment, net of ACL	10,954,163	10,900,400
Mortgage servicing rights	43,037	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	0
Other borrowings	180,698	177,689
Derivative Liabilities	$ 0	$ 0

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