v3.26.3
Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value $ 9,051,205 $ 9,348,807
Total liabilities at fair value (179,334) (79,816)
Derivative liabilities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total liabilities at fair value (179,334) (79,816)
U.S. Treasury securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 300,665 268,653
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 1,940,715 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 790,361 534,363
Private label residential MBS and CMOs    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 2,701,955 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 2,234,196 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 54,783 225,892
Collateralized loan obligations    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 709,066 780,944
Non-mortgage asset-backed securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 55,333 58,765
State and municipal obligations    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 63,716 109,520
SBA securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 48,869 57,815
Marketable equity securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 5,698 5,734
Derivative assets    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total assets at fair value 145,848 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 306,363 274,387
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 300,665 268,653
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 5,698 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 8,744,842 9,074,420
Total liabilities at fair value (179,334) (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 (179,334) (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 1,940,715 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 790,361 534,363
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 2,701,955 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 2,234,196 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 54,783 225,892
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 709,066 780,944
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 55,333 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 63,716 109,520
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 48,869 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 $ 145,848 $ 85,156