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	Mar. 31, 2025	Dec. 31, 2024
Financial assets:
Cash and cash equivalents	$ 3,448,284	$ 5,250,742
Interest-bearing deposits with banks	32,788	48,198
Resale agreements	425,000	425,000
HTM debt securities	2,905,341	2,917,413
Restricted equity securities, at cost	165,594	165,259
Loans held-for-investment, net	53,517,878	53,024,585
Financial liabilities:
FHLB advances	3,500,000	3,500,000
Repurchase agreements	270,111	0
Carrying Amount
Financial assets:
Cash and cash equivalents	3,448,284	5,250,742
Interest-bearing deposits with banks	32,788	48,198
Resale agreements	425,000	425,000
HTM debt securities	2,905,341	2,917,413
Restricted equity securities, at cost	165,594	165,259
Loans held-for-investment, net	53,517,878	53,024,585
Mortgage servicing rights	4,940	5,234
Accrued interest receivable	308,264	316,392
Financial liabilities:
Demand, checking, savings and money market deposits	39,387,398	39,959,251
Time deposits	23,664,707	23,215,772
FHLB advances	3,500,000	3,500,000
Repurchase agreements	270,111
Long-term debt	32,079	32,001
Accrued interest payable	58,867	61,950
Estimated Fair Value
Financial assets:
Cash and cash equivalents	3,448,284	5,250,742
Interest-bearing deposits with banks	32,788	48,198
Resale agreements	340,197	329,769
HTM debt securities	2,435,292	2,387,754
Restricted equity securities, at cost	165,594	165,259
Loans held-for-investment, net	52,216,008	51,328,254
Mortgage servicing rights	8,385	8,822
Accrued interest receivable	308,264	316,392
Financial liabilities:
Demand, checking, savings and money market deposits	39,387,398	39,959,251
Time deposits	23,662,328	23,225,317
FHLB advances	3,502,656	3,497,953
Repurchase agreements	270,109
Long-term debt	31,207	31,246
Accrued interest payable	58,867	61,950
Estimated Fair Value | Level 1
Financial assets:
Cash and cash equivalents	3,448,284	5,250,742
Interest-bearing deposits with banks	0	0
Resale agreements	0	0
HTM debt securities	508,613	499,858
Restricted equity securities, at cost	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
FHLB advances	0	0
Repurchase agreements	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	32,788	48,198
Resale agreements	340,197	329,769
HTM debt securities	1,926,679	1,887,896
Restricted equity securities, at cost	165,594	165,259
Loans held-for-investment, net	0	0
Mortgage servicing rights	0	0
Accrued interest receivable	308,264	316,392
Financial liabilities:
Demand, checking, savings and money market deposits	39,387,398	39,959,251
Time deposits	23,662,328	23,225,317
FHLB advances	3,502,656	3,497,953
Repurchase agreements	270,109
Long-term debt	31,207	31,246
Accrued interest payable	58,867	61,950
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-investment, net	52,216,008	51,328,254
Mortgage servicing rights	8,385	8,822
Accrued interest receivable	0	0
Financial liabilities:
Demand, checking, savings and money market deposits	0	0
Time deposits	0	0
FHLB advances	0	0
Repurchase agreements	0
Long-term debt	0	0
Accrued interest payable	$ 0	$ 0