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Investment Securities - Securities Available for Sale (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | $ 2,526,644,000 | $ 2,699,255,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | (199,000)
Debt Securities, Available-for-Sale, Net Carrying Amount | 2,526,644,000 | 2,699,056,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 699,000 | 262,000
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (280,504,000) | (352,454,000)
(amortized cost of $2,526,644 and $2,699,255, respectively) | 2,246,839,000 | 2,346,864,000
Interest Receivable | 12,600,000 | 10,000,000.0
Residential Mortgage Backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 1,051,601,000 | 1,388,801,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-Sale, Net Carrying Amount | 1,051,601,000 | 1,388,801,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (189,761,000) | (201,192,000)
(amortized cost of $2,526,644 and $2,699,255, respectively) | 861,840,000 | 1,187,609,000
US Treasury Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis |  | 4,965,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss |  | 0
Debt Securities, Available-for-Sale, Net Carrying Amount |  | 4,965,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 3,000
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax |  | 0
(amortized cost of $2,526,644 and $2,699,255, respectively) |  | 4,968,000
Government agency and government-sponsored enterprise pass through securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 52,610,000 | 268,639,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-Sale, Net Carrying Amount | 52,610,000 | 268,639,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (1,046,000) | (15,333,000)
(amortized cost of $2,526,644 and $2,699,255, respectively) | 51,564,000 | 253,306,000
Government agency and government-sponsored enterprise collateralized mortgage obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 467,319,000 | 320,984,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-Sale, Net Carrying Amount | 467,319,000 | 320,984,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 223,000 | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (20,911,000) | (36,650,000)
(amortized cost of $2,526,644 and $2,699,255, respectively) | 446,631,000 | 284,334,000
US States and Political Subdivisions Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 602,000 | 29,192,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-Sale, Net Carrying Amount | 602,000 | 29,192,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (8,000) | (1,109,000)
(amortized cost of $2,526,644 and $2,699,255, respectively) | 594,000 | 28,083,000
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 289,098,000 | 327,426,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | (199,000)
Debt Securities, Available-for-Sale, Net Carrying Amount | 289,098,000 | 327,227,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 259,000
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (31,386,000) | (60,254,000)
(amortized cost of $2,526,644 and $2,699,255, respectively) | 257,712,000 | 267,232,000
Private Label Collateralized Mortgage Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 352,615,000 | 193,071,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-Sale, Net Carrying Amount | 352,615,000 | 193,071,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 7,000 | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (35,712,000) | (34,659,000)
(amortized cost of $2,526,644 and $2,699,255, respectively) | 316,910,000 | 158,412,000
Collateralized Loan Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 278,976,000 | 109,168,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-Sale, Net Carrying Amount | 278,976,000 | 109,168,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 469,000 | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (29,000) | (752,000)
(amortized cost of $2,526,644 and $2,699,255, respectively) | 279,416,000 | 108,416,000
Mortgage-backed Securities, Issued by Private Enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 13,585,000 | 22,126,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-Sale, Net Carrying Amount | 13,585,000 | 22,126,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (1,213,000) | (1,313,000)
(amortized cost of $2,526,644 and $2,699,255, respectively) | 12,372,000 | 20,813,000
Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 15,674,000 | 20,241,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-Sale, Net Carrying Amount | 15,674,000 | 20,241,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (74,000) | (289,000)
(amortized cost of $2,526,644 and $2,699,255, respectively) | 15,600,000 | 19,952,000
SBA asset-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Amortized Cost Basis | 4,564,000 | 14,642,000
Debt Securities, Available-for-Sale, Allowance for Credit Loss | 0 | 0
Debt Securities, Available-for-Sale, Net Carrying Amount | 4,564,000 | 14,642,000
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | (364,000) | (903,000)
(amortized cost of $2,526,644 and $2,699,255, respectively) | 4,200,000 | 13,739,000
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Interest Receivable | $ 13,400,000 | $ 13,400,000

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