v3.26.1
Fair Value Measurements - Schedule of Carrying Amounts, Estimated Fair Values, and Classifications Within the Fair Value Hierarchy (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held-to-maturity investment securities, net, Fair Value $ 6,809,865 $ 7,168,583
Carrying Amount | Fair Value, Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 2,722,427 2,449,525
Held-to-maturity investment securities, net, Carrying Amount 7,694,979 7,969,575
Loans and leases, net 57,144,832 55,877,699
Securities sold under agreements to repurchase 73,395 596,738
FHLB advances 3,661,246 2,980,718
Long-term debt 737,171 739,454
Carrying Amount | Fair Value, Nonrecurring | Deposit liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deposits 61,921,204 60,189,495
Carrying Amount | Fair Value, Nonrecurring | Time deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deposits 8,362,249 8,570,318
Level 1 | Fair Value | Fair Value, Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents 2,722,427 2,449,525
Level 2 | Fair Value | Fair Value, Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Held-to-maturity investment securities, net, Fair Value 6,809,865 7,168,583
Securities sold under agreements to repurchase 73,388 596,872
FHLB advances 3,655,761 2,978,201
Long-term debt 783,839 791,945
Level 2 | Fair Value | Fair Value, Nonrecurring | Deposit liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deposits 61,921,204 60,189,495
Level 2 | Fair Value | Fair Value, Nonrecurring | Time deposits    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deposits 8,341,022 8,553,998
Level 3 | Fair Value | Fair Value, Nonrecurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans and leases, net $ 55,947,509 $ 54,892,526