v3.26.1
Borrowings - Schedule of Available Borrowing Capacity and Related Pledged Collateral (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Debt Instrument [Line Items]    
Available Borrowing Capacity $ 4,119,263 $ 3,974,188
Assets Pledged As Collateral    
Debt Instrument [Line Items]    
Pledged Collateral 5,332,677 5,107,758
FRB Discount Window | Assets Pledged As Collateral    
Debt Instrument [Line Items]    
Pledged Collateral 4,489,394 4,245,845
FRB Discount Window | Assets Pledged As Collateral | Loans    
Debt Instrument [Line Items]    
Pledged Collateral   4,200,000
FHLB of Des Moines | Assets Pledged As Collateral    
Debt Instrument [Line Items]    
Pledged Collateral 843,283 861,913
FHLB of Des Moines | Assets Pledged As Collateral | Loans    
Debt Instrument [Line Items]    
Pledged Collateral   486,200
FHLB of Des Moines | Assets Pledged As Collateral | Securities    
Debt Instrument [Line Items]    
Pledged Collateral   375,700
FRB Discount Window    
Debt Instrument [Line Items]    
Available Borrowing Capacity 3,446,444 3,294,827
FRB Discount Window | FRB Discount Window | Assets Pledged As Collateral | Loans    
Debt Instrument [Line Items]    
Pledged Collateral 4,500,000  
FHLB of Des Moines    
Debt Instrument [Line Items]    
Available Borrowing Capacity 672,819 $ 679,361
FHLB of Des Moines | FHLB of Des Moines | Assets Pledged As Collateral | Loans    
Debt Instrument [Line Items]    
Pledged Collateral 467,700  
FHLB of Des Moines | FHLB of Des Moines | Assets Pledged As Collateral | Securities    
Debt Instrument [Line Items]    
Pledged Collateral $ 375,600