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	Dec. 31, 2024	Dec. 31, 2023
Financial assets:
Cash and cash equivalents	$ 5,250,742	$ 4,614,984
Interest-bearing deposits with banks	48,198	10,498
Resale agreements	425,000	785,000
HTM debt securities	2,917,413	2,956,040
Restricted equity securities, at cost	165,259	79,811
Loans held-for-investment, net	53,024,585	51,542,039
Financial liabilities:
Time deposits	23,215,772
FHLB advances	3,500,000	0
Carrying Amount
Financial assets:
Cash and cash equivalents	5,250,742	4,614,984
Interest-bearing deposits with banks	48,198	10,498
Resale agreements	425,000	785,000
HTM debt securities	2,917,413	2,956,040
Restricted equity securities, at cost	165,259	79,811
Loans held-for-sale		116
Loans held-for-investment, net	53,024,585	51,542,039
Mortgage servicing rights	5,234	6,602
Accrued interest receivable	316,392	331,490
Financial liabilities:
Demand, checking, savings and money market deposits	39,959,251	38,048,974
Time deposits	23,215,772	18,043,464
FHLB advances	3,500,000
BTFP borrowings		4,500,000
Long-term debt	32,001	148,249
Accrued interest payable	61,950	205,430
Estimated Fair Value
Financial assets:
Cash and cash equivalents	5,250,742	4,614,984
Interest-bearing deposits with banks	48,198	10,498
Resale agreements	329,769	699,056
HTM debt securities	2,387,754	2,453,971
Restricted equity securities, at cost	165,259	79,811
Loans held-for-sale		116
Loans held-for-investment, net	51,328,254	50,256,565
Mortgage servicing rights	8,822	9,470
Accrued interest receivable	316,392	331,490
Financial liabilities:
Demand, checking, savings and money market deposits	39,959,251	38,048,974
Time deposits	23,225,317	18,004,951
FHLB advances	3,497,953
BTFP borrowings		4,500,000
Long-term debt	31,246	150,896
Accrued interest payable	61,950	205,430
Estimated Fair Value | Level 1
Financial assets:
Cash and cash equivalents	5,250,742	4,614,984
Interest-bearing deposits with banks	0	0
Resale agreements	0	0
HTM debt securities	499,858	488,551
Restricted equity securities, at cost	0	0
Loans held-for-sale		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
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	48,198	10,498
Resale agreements	329,769	699,056
HTM debt securities	1,887,896	1,965,420
Restricted equity securities, at cost	165,259	79,811
Loans held-for-sale		116
Loans held-for-investment, net	0	0
Mortgage servicing rights	0	0
Accrued interest receivable	316,392	331,490
Financial liabilities:
Demand, checking, savings and money market deposits	39,959,251	38,048,974
Time deposits	23,225,317	18,004,951
FHLB advances	3,497,953
BTFP borrowings		4,500,000
Long-term debt	31,246	150,896
Accrued interest payable	61,950	205,430
Estimated Fair Value | Level 3
Financial assets:
Cash and cash equivalents	0	0
Interest-bearing deposits with banks	0	0
Resale agreements	0	0
HTM debt securities	0	0
Restricted equity securities, at cost	0	0
Loans held-for-sale		0
Loans held-for-investment, net	51,328,254	50,256,565
Mortgage servicing rights	8,822	9,470
Accrued interest receivable	0	0
Financial liabilities:
Demand, checking, savings and money market deposits	0	0
Time deposits	0	0
FHLB advances	0
BTFP borrowings		0
Long-term debt	0	0
Accrued interest payable	$ 0	$ 0