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Investment Securities - Securities Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 2,657,281 | $ 2,699,255
Allowance for Credit Loss | (199) | (199)
Net Carrying Amount | 2,657,082 | 2,699,056
Gross Unrealized Gains | 1,594 | 262
Gross Unrealized Losses | 371,994 | 352,454
Fair Value | 2,286,682 | 2,346,864
Agency residential MBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,364,245 | 1,388,801
Allowance for Credit Loss | 0 | 0
Net Carrying Amount | 1,364,245 | 1,388,801
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 226,776 | 201,192
Fair Value | 1,137,469 | 1,187,609
Agency commercial MBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 260,116 | 268,639
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 16,729 | 15,333
Fair Value | 243,387 | 253,306
Agency residential CMOs |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 317,605 | 320,984
Allowance for Credit Loss | 0 | 0
Net Carrying Amount | 317,605 | 320,984
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 36,036 | 36,650
Fair Value | 281,569 | 284,334
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 4,965
Allowance for Credit Loss |  | 0
Net Carrying Amount |  | 4,965
Gross Unrealized Gains |  | 3
Gross Unrealized Losses |  | 0
Fair Value |  | 4,968
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 34,645 | 29,192
Allowance for Credit Loss | 0 | 0
Net Carrying Amount | 34,645 | 29,192
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1,386 | 1,109
Fair Value | 33,259 | 28,083
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 109,167 | 109,168
Allowance for Credit Loss | 0 | 0
Net Carrying Amount | 109,167 | 109,168
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 89 | 752
Fair Value | 109,078 | 108,416
Corporate Debt Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 327,447 | 327,426
Allowance for Credit Loss | (199) | (199)
Net Carrying Amount | 327,248 | 327,227
Gross Unrealized Gains | 1,592 | 259
Gross Unrealized Losses | 51,642 | 60,254
Fair Value | 277,198 | 267,232
Private label commercial MBS |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 20,725 | 22,126
Allowance for Credit Loss | 0 | 0
Net Carrying Amount | 20,725 | 22,126
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1,234 | 1,313
Fair Value | 19,491 | 20,813
SBA securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 13,917 | 14,642
Allowance for Credit Loss | 0 | 0
Net Carrying Amount | 13,917 | 14,642
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1,006 | 903
Fair Value | 12,911 | 13,739
Private Label Collateralized Mortgage Obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 190,508 | 193,071
Allowance for Credit Loss | 0 | 0
Net Carrying Amount | 190,508 | 193,071
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 37,096 | 34,659
Fair Value | 153,412 | 158,412
Asset-backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 18,906 | 20,241
Allowance for Credit Loss | 0 | 0
Net Carrying Amount | 18,906 | 20,241
Gross Unrealized Gains | 2 | 0
Gross Unrealized Losses | 0 | 289
Fair Value | 18,908 | 19,952
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 | $ 260,116 | $ 268,639

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