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Borrowings - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 02, 2025
Dec. 31, 2025
Dec. 31, 2024
Debt Instrument [Line Items]      
FHLB and FRB borrowings   $ 284,922 $ 239,000
Debt instrument, term   12 months 12 months
Percent of assets   25.00%  
Percent outstanding advances   100.00%  
Total available borrowing capacity   $ 5,997,854 $ 5,961,266
Line of Credit Facility, Current Borrowing Capacity   6,282,854 6,200,266
Short-Term Debt   $ 285,000 $ 239,000
Debt, Weighted Average Interest Rate   3.32% 4.66%
Debt Instrument, Unamortized Discount, Current   $ (78)  
Debt Instrument, Discounts, Weighted Average Effective Rate   3.32%  
Territorial Bancorp Inc.      
Debt Instrument [Line Items]      
Debt, Weighted Average Interest Rate   1.97%  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, FHLB Advances $ (160,000)    
Repayment of FHLB Advances 125,000    
FHLB, advance, matured in 2025   $ 25,000  
FHLB, advance, due in 2026   10,000  
Federal Home Loan Bank, Advances, Discount $ (211)    
Unsecured Credit Facility with FHLB      
Debt Instrument [Line Items]      
FHLB and FRB borrowings   0 $ 0
Federal Home Loan Bank Certificates and Obligations (FHLB)      
Debt Instrument [Line Items]      
Total available borrowing capacity   4,013,514  
Line of Credit Facility, Current Borrowing Capacity   4,298,514  
Short-Term Debt   $ 285,000  
Debt, Weighted Average Interest Rate   3.32%  
Federal Reserve Bank, Discount Window1      
Debt Instrument [Line Items]      
Total available borrowing capacity   $ 1,653,160 1,592,467
Line of Credit Facility, Current Borrowing Capacity   1,653,160 1,731,467
Short-Term Debt   $ 0 $ 139,000
Debt, Weighted Average Interest Rate   0.00% 4.50%
Unsecured Credit Facility with FHLB      
Debt Instrument [Line Items]      
Total available borrowing capacity   $ 331,180 $ 317,391
Line of Credit Facility, Current Borrowing Capacity   331,180 317,391
Short-Term Debt   $ 0 $ 0
Debt, Weighted Average Interest Rate   0.00% 0.00%
Federal Reserve Bank Advances      
Debt Instrument [Line Items]      
Total available borrowing capacity     $ 4,051,408
Line of Credit Facility, Current Borrowing Capacity     4,151,408
Short-Term Debt     $ 100,000
Debt, Weighted Average Interest Rate     4.88%
Qualifying Loans      
Debt Instrument [Line Items]      
Asset balance used to determine maximum borrowing capacity from federal reserve bank   $ 1,900,000  
FRB Discount Window      
Debt Instrument [Line Items]      
Percent of qualifying assets (up to)   99.00%  
Securities pledged as collateral   $ 0  
Put Option      
Debt Instrument [Line Items]      
FHLB and FRB borrowings   $ 275,000  
Debt instrument, term   2 years  
Mortgage Loans on Real Estate      
Debt Instrument [Line Items]      
Pledged as collateral, FHLB   $ 8,700,000 $ 7,580,000
Pledged as collateral, excluding FHLB   $ 11,100