Fair Value Measurement and Fair Value of Financial Instruments - Schedule Of The Carrying And Fair Value Estimates Per The Fair Value Hierarchy Of Financial Instruments Measured On a Nonrecurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Financial assets:
Cash and cash equivalents	$ 4,365,691	$ 4,614,984
Interest-bearing deposits with banks	24,530	10,498
Securities purchased under resale agreements (“resale agreements”)	485,000	785,000
HTM debt securities	2,938,250	2,956,040
Restricted equity securities, at cost	165,164	79,811
Financial liabilities:
Federal Home Loan Bank (“FHLB”) advances	3,500,000	0
Carrying Amount
Financial assets:
Cash and cash equivalents	4,365,691	4,614,984
Interest-bearing deposits with banks	24,530	10,498
Securities purchased under resale agreements (“resale agreements”)	485,000	785,000
HTM debt securities	2,938,250	2,956,040
Restricted equity securities, at cost	165,164	79,811
Loans held-for-sale	18,909	116
Loans held-for-investment, net	52,084,115	51,542,039
Mortgage servicing rights	5,903	6,602
Accrued interest receivable	329,442	331,490
Financial liabilities:
Demand, checking, savings and money market deposits	38,229,098	38,048,974
Time deposits	21,770,687	18,043,464
Federal Home Loan Bank (“FHLB”) advances	3,500,000
BTFP borrowings		4,500,000
Long-term debt	31,844	148,249
Accrued interest payable	63,078	205,430
Estimated Fair Value
Financial assets:
Cash and cash equivalents	4,365,691	4,614,984
Interest-bearing deposits with banks	24,530	10,498
Securities purchased under resale agreements (“resale agreements”)	390,522	699,056
HTM debt securities	2,405,227	2,453,971
Restricted equity securities, at cost	165,164	79,811
Loans held-for-sale	18,909	116
Loans held-for-investment, net	50,340,499	50,256,565
Mortgage servicing rights	10,385	9,470
Accrued interest receivable	329,442	331,490
Financial liabilities:
Demand, checking, savings and money market deposits	38,229,098	38,048,974
Time deposits	21,726,174	18,004,951
Federal Home Loan Bank (“FHLB”) advances	3,504,276
BTFP borrowings		4,500,000
Long-term debt	30,316	150,896
Accrued interest payable	63,078	205,430
Estimated Fair Value | Level 1
Financial assets:
Cash and cash equivalents	4,365,691	4,614,984
Interest-bearing deposits with banks	0	0
Securities purchased under resale agreements (“resale agreements”)	0	0
HTM debt securities	487,707	488,551
Restricted equity securities, at cost	0	0
Loans held-for-sale	0	0
Loans held-for-investment, net	0	0
Mortgage servicing rights	0	0
Accrued interest receivable	0	0
Financial liabilities:
Demand, checking, savings and money market deposits	0	0
Time deposits	0	0
Federal Home Loan Bank (“FHLB”) advances	0
BTFP borrowings		0
Long-term debt	0	0
Accrued interest payable	0	0
Estimated Fair Value | Level 2
Financial assets:
Cash and cash equivalents	0	0
Interest-bearing deposits with banks	24,530	10,498
Securities purchased under resale agreements (“resale agreements”)	390,522	699,056
HTM debt securities	1,917,520	1,965,420
Restricted equity securities, at cost	165,164	79,811
Loans held-for-sale	18,909	116
Loans held-for-investment, net	0	0
Mortgage servicing rights	0	0
Accrued interest receivable	329,442	331,490
Financial liabilities:
Demand, checking, savings and money market deposits	38,229,098	38,048,974
Time deposits	21,726,174	18,004,951
Federal Home Loan Bank (“FHLB”) advances	3,504,276
BTFP borrowings		4,500,000
Long-term debt	30,316	150,896
Accrued interest payable	63,078	205,430
Estimated Fair Value | Level 3
Financial assets:
Cash and cash equivalents	0	0
Interest-bearing deposits with banks	0	0
Securities purchased under resale agreements (“resale agreements”)	0	0
HTM debt securities	0	0
Restricted equity securities, at cost	0	0
Loans held-for-sale	0	0
Loans held-for-investment, net	50,340,499	50,256,565
Mortgage servicing rights	10,385	9,470
Accrued interest receivable	0	0
Financial liabilities:
Demand, checking, savings and money market deposits	0	0
Time deposits	0	0
Federal Home Loan Bank (“FHLB”) advances	0
BTFP borrowings		0
Long-term debt	0	0
Accrued interest payable	$ 0	$ 0