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Investment Securities - Securities Available for Sale (Details) - USD ($)
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 2,526,306,000 $ 2,699,255,000
Allowance for Credit Loss (199,000) (199,000)
Net Carrying Amount 2,526,107,000 2,699,056,000
Gross Unrealized Gains 4,851,000 262,000
Gross Unrealized Losses 230,674,000 352,454,000
Fair Value 2,300,284,000 2,346,864,000
Interest Receivable 12,700,000 10,000,000.0
Agency residential MBS    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 1,071,154,000 1,388,801,000
Allowance for Credit Loss 0 0
Net Carrying Amount 1,071,154,000 1,388,801,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 148,706,000 201,192,000
Fair Value 922,448,000 1,187,609,000
Agency commercial MBS (1)    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 34,193,000 268,639,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 661,000 15,333,000
Fair Value 33,532,000 253,306,000
Agency residential CMOs    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 432,183,000 320,984,000
Allowance for Credit Loss 0 0
Net Carrying Amount 432,183,000 320,984,000
Gross Unrealized Gains 1,910,000 0
Gross Unrealized Losses 15,853,000 36,650,000
Fair Value 418,240,000 284,334,000
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost   4,965,000
Allowance for Credit Loss   0
Net Carrying Amount   4,965,000
Gross Unrealized Gains   3,000
Gross Unrealized Losses   0
Fair Value   4,968,000
Municipal securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 602,000 29,192,000
Allowance for Credit Loss 0 0
Net Carrying Amount 602,000 29,192,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 5,000 1,109,000
Fair Value 597,000 28,083,000
Collateralized loan obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 284,743,000 109,168,000
Allowance for Credit Loss 0 0
Net Carrying Amount 284,743,000 109,168,000
Gross Unrealized Gains 365,000 0
Gross Unrealized Losses 135,000 752,000
Fair Value 284,973,000 108,416,000
Corporate Debt Securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 300,996,000 327,426,000
Allowance for Credit Loss (199,000) (199,000)
Net Carrying Amount 300,797,000 327,227,000
Gross Unrealized Gains 1,753,000 259,000
Gross Unrealized Losses 35,920,000 60,254,000
Fair Value 266,630,000 267,232,000
Private label commercial MBS    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 14,415,000 22,126,000
Allowance for Credit Loss 0 0
Net Carrying Amount 14,415,000 22,126,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 793,000 1,313,000
Fair Value 13,622,000 20,813,000
SBA securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 4,565,000 14,642,000
Allowance for Credit Loss 0 0
Net Carrying Amount 4,565,000 14,642,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 252,000 903,000
Fair Value 4,313,000 13,739,000
Private Label Collateralized Mortgage Obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 367,168,000 193,071,000
Allowance for Credit Loss 0 0
Net Carrying Amount 367,168,000 193,071,000
Gross Unrealized Gains 823,000 0
Gross Unrealized Losses 28,266,000 34,659,000
Fair Value 339,725,000 158,412,000
Asset-backed Securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 16,287,000 20,241,000
Allowance for Credit Loss 0 0
Net Carrying Amount 16,287,000 20,241,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 83,000 289,000
Fair Value 16,204,000 19,952,000
Government agency and government-sponsored enterprise pass through securities    
Debt Securities, Available-for-sale [Line Items]    
Allowance for Credit Loss 0 0
Net Carrying Amount $ 34,193,000 $ 268,639,000