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, 2025	Dec. 31, 2024
Financial assets:
Cash and cash equivalents	$ 4,409,941	$ 5,250,742
Interest-bearing deposits with banks	104,535	48,198
Resale agreements	425,000	425,000
HTM debt securities	2,892,982	2,917,413
Restricted equity securities, at cost	165,989	165,259
Loans held-for-investment, net	54,200,768	53,024,585
Financial liabilities:
FHLB advances	3,500,000	3,500,000
Carrying Amount
Financial assets:
Cash and cash equivalents	4,409,941	5,250,742
Interest-bearing deposits with banks	104,535	48,198
Resale agreements	425,000	425,000
HTM debt securities	2,892,982	2,917,413
Restricted equity securities, at cost	165,989	165,259
Loans held-for-sale	11,873
Loans held-for-investment, net	54,200,768	53,024,585
Mortgage servicing rights	4,628	5,234
Accrued interest receivable	311,264	316,392
Financial liabilities:
Demand, checking, savings and money market deposits	40,718,153	39,959,251
Time deposits	24,311,340	23,215,772
FHLB advances	3,500,000	3,500,000
Long-term debt	32,158	32,001
Accrued interest payable	61,177	61,950
Estimated Fair Value
Financial assets:
Cash and cash equivalents	4,409,941	5,250,742
Interest-bearing deposits with banks	104,535	48,198
Resale agreements	340,586	329,769
HTM debt securities	2,437,247	2,387,754
Restricted equity securities, at cost	165,989	165,259
Loans held-for-sale	11,873
Loans held-for-investment, net	52,607,452	51,328,254
Mortgage servicing rights	7,971	8,822
Accrued interest receivable	311,264	316,392
Financial liabilities:
Demand, checking, savings and money market deposits	40,718,153	39,959,251
Time deposits	24,305,849	23,225,317
FHLB advances	3,503,363	3,497,953
Long-term debt	31,293	31,246
Accrued interest payable	61,177	61,950
Estimated Fair Value | Level 1
Financial assets:
Cash and cash equivalents	4,409,941	5,250,742
Interest-bearing deposits with banks	0	0
Resale agreements	0	0
HTM debt securities	514,767	499,858
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	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	104,535	48,198
Resale agreements	340,586	329,769
HTM debt securities	1,922,480	1,887,896
Restricted equity securities, at cost	165,989	165,259
Loans held-for-sale	11,873
Loans held-for-investment, net	0	0
Mortgage servicing rights	0	0
Accrued interest receivable	311,264	316,392
Financial liabilities:
Demand, checking, savings and money market deposits	40,718,153	39,959,251
Time deposits	24,305,849	23,225,317
FHLB advances	3,503,363	3,497,953
Long-term debt	31,293	31,246
Accrued interest payable	61,177	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-sale	0
Loans held-for-investment, net	52,607,452	51,328,254
Mortgage servicing rights	7,971	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
Long-term debt	0	0
Accrued interest payable	$ 0	$ 0