v3.26.1
Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value $ 9,379,786 $ 9,348,807
Total liabilities at fair value (77,917) (79,816)
Derivative liabilities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total liabilities at fair value (77,917) (79,816)
U.S. Treasury securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 307,677 268,653
U.S. Government agency and sponsored enterprise residential MBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 2,229,375 2,563,027
U.S. Government agency and sponsored enterprise commercial MBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 750,700 534,363
Private label residential MBS and CMOs    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 2,526,164 2,490,828
Private label commercial MBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 2,364,360 2,168,110
Single family real estate-backed securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 182,795 225,892
Collateralized loan obligations    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 772,056 780,944
Non-mortgage asset-backed securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 56,498 58,765
State and municipal obligations    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 69,703 109,520
SBA securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 52,534 57,815
Marketable equity securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 5,752 5,734
Derivative assets    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 62,172 85,156
Fair Value, Inputs, Level 1    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 313,429 274,387
Total liabilities at fair value 0 0
Fair Value, Inputs, Level 1 | Derivative liabilities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total liabilities at fair value 0 0
Fair Value, Inputs, Level 1 | U.S. Treasury securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 307,677 268,653
Fair Value, Inputs, Level 1 | U.S. Government agency and sponsored enterprise residential MBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 0 0
Fair Value, Inputs, Level 1 | U.S. Government agency and sponsored enterprise commercial MBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 0 0
Fair Value, Inputs, Level 1 | Private label residential MBS and CMOs    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 0 0
Fair Value, Inputs, Level 1 | Private label commercial MBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 0 0
Fair Value, Inputs, Level 1 | Single family real estate-backed securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 0 0
Fair Value, Inputs, Level 1 | Collateralized loan obligations    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 0 0
Fair Value, Inputs, Level 1 | Non-mortgage asset-backed securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 0 0
Fair Value, Inputs, Level 1 | State and municipal obligations    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 0 0
Fair Value, Inputs, Level 1 | SBA securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 0 0
Fair Value, Inputs, Level 1 | Marketable equity securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 5,752 5,734
Fair Value, Inputs, Level 1 | Derivative assets    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 0 0
Fair Value, Inputs, Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 9,066,357 9,074,420
Total liabilities at fair value (77,917) (79,816)
Fair Value, Inputs, Level 2 | Derivative liabilities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total liabilities at fair value (77,917) (79,816)
Fair Value, Inputs, Level 2 | U.S. Treasury securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 0 0
Fair Value, Inputs, Level 2 | U.S. Government agency and sponsored enterprise residential MBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 2,229,375 2,563,027
Fair Value, Inputs, Level 2 | U.S. Government agency and sponsored enterprise commercial MBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 750,700 534,363
Fair Value, Inputs, Level 2 | Private label residential MBS and CMOs    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 2,526,164 2,490,828
Fair Value, Inputs, Level 2 | Private label commercial MBS    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 2,364,360 2,168,110
Fair Value, Inputs, Level 2 | Single family real estate-backed securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 182,795 225,892
Fair Value, Inputs, Level 2 | Collateralized loan obligations    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 772,056 780,944
Fair Value, Inputs, Level 2 | Non-mortgage asset-backed securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 56,498 58,765
Fair Value, Inputs, Level 2 | State and municipal obligations    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 69,703 109,520
Fair Value, Inputs, Level 2 | SBA securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 52,534 57,815
Fair Value, Inputs, Level 2 | Marketable equity securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 0 0
Fair Value, Inputs, Level 2 | Derivative assets    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value $ 62,172 $ 85,156