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Derivative Financial Instruments - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Derivative [Line Items]                
Notional amount $ 1,674,369   $ 1,674,369     $ 1,772,298    
Accumulated other comprehensive income (loss) 1,124,138 $ 1,258,091 1,124,138 $ 1,258,091 $ 1,137,680 1,083,985 $ 1,445,266 $ 1,386,087
Interest Rate Agreements Accounted for as Cash Flow Hedges                
Derivative [Line Items]                
Accumulated other comprehensive income (loss) (70,256) (74,383) (70,256) (74,383) $ (71,285) (72,303) $ (75,412) $ (76,430)
Cash Flow Hedging | Interest Rate Agreements Accounted for as Cash Flow Hedges                
Derivative [Line Items]                
Accumulated other comprehensive income (loss) (70,000)   (70,000)     (72,000)    
Interest Expense | Cash Flow Hedging                
Derivative [Line Items]                
Expected amortization of realized losses related to terminated cash flow hedges     4,000          
Mortgage Banking Activities, Net                
Derivative [Line Items]                
Market valuations gains (losses), net 9,849 (46,590) 21,956 (45,297)        
Loan purchase commitments and forward sales commitments | Mortgage Banking Activities, Net                
Derivative [Line Items]                
Market valuations gains (losses), net 2,000 (9,000) 2,000 (51,000)        
Interest Rate Swap And Swaptions                
Derivative [Line Items]                
Notional amount 190,000   190,000          
TBAs                
Derivative [Line Items]                
Notional amount 940,000   940,000     1,070,000    
Interest rate futures                
Derivative [Line Items]                
Notional amount 193,000   193,000     411,000    
Interest rate contract                
Derivative [Line Items]                
Notional amount           $ 285,000    
Interest rate contract | Cash Flow Hedging                
Derivative [Line Items]                
Realized net losses from accumulated comprehensive loss into Interest expense (1,000) (2,000) (1,000) (2,000)        
Unsecuritized Residential and Commercial Loans                
Derivative [Line Items]                
Derivative gain (loss) $ 13,000 $ 30,000 $ (4,000) $ 122,000