Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Commitments to Extend Credit
Letters of credit	$ 3,100,000	$ 2,900,000
Allowance for unfunded credit commitments	48,000	39,000
Loans Sold or Securitized With Recourse | Single Family and Multi-family Residential Loans | Loans Sold or Securitized with Recourse
Commitments to Extend Credit
Allowance for unfunded credit commitments	28	34
Standby Letters of Credit
Commitments to Extend Credit
Letters of credit	3,100,000	2,900,000
Commercial Letters of Credit
Commitments to Extend Credit
Letters of credit	$ 23,000	$ 29,000