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Investment Securities - Securities Held-to-Maturity Allowance for Credit Losses (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |
Allowance for Credit Losses, Beginning of Period | $ 1,500 |  | $ 1,500 | $ 1,500 | [1] | $ 1,500 |  |
Provision for Credit Losses | 0 |  | 0 | 0 |  | 0 |  |
Charge-offs | 0 |  | 0 | 0 |  | 0 |  |
Recoveries | 0 |  | 0 | 0 |  | 0 |  |
Allowance for Credit Losses, End of Period | 1,500 | [2] | 1,500 | 1,500 | [2] | 1,500 |  |
Securities held to maturity, fair value | 2,145,929 | [2] |  | 2,145,929 | [2] |  | $ 2,168,316 | [1]
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 46 | [2] |  | 46 | [2] |  | 1,760 | [1]
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (150,825) | [2] |  | (150,825) | [2] |  | (120,735) | [1]
U.S. Treasury securities |  |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |
Allowance for Credit Losses, Beginning of Period |  |  |  | 0 |  |  |  |
Allowance for Credit Losses, End of Period | 0 |  |  | 0 |  |  |  |
Securities held to maturity, fair value | 171,929 |  |  | 171,929 |  |  | 175,579 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  |  | 0 |  |  | 0 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (16,566) |  |  | (16,566) |  |  | (11,454) |
Municipal securities |  |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |
Allowance for Credit Losses, Beginning of Period |  |  |  | 140 |  |  |  |
Allowance for Credit Losses, End of Period | 140 |  |  | 140 |  |  |  |
Securities held to maturity, fair value | 1,198,010 |  |  | 1,198,010 |  |  | 1,220,760 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 46 |  |  | 46 |  |  | 1,760 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (51,317) |  |  | (51,317) |  |  | (28,170) |
Agency commercial MBS |  |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |
Allowance for Credit Losses, Beginning of Period |  |  |  | 0 |  |  |  |
Allowance for Credit Losses, End of Period | 0 |  |  | 0 |  |  |  |
Securities held to maturity, fair value | 400,719 |  |  | 400,719 |  |  | 403,162 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  |  | 0 |  |  | 0 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (36,391) |  |  | (36,391) |  |  | (30,665) |
Private label commercial MBS |  |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |
Allowance for Credit Losses, Beginning of Period |  |  |  | 0 |  |  |  |
Allowance for Credit Losses, End of Period | 0 |  |  | 0 |  |  |  |
Securities held to maturity, fair value | 322,827 |  |  | 322,827 |  |  | 321,204 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  |  | 0 |  |  | 0 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (30,053) |  |  | (30,053) |  |  | (29,289) |
Corporate Debt Securities |  |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |
Allowance for Credit Losses, Beginning of Period |  |  |  | 1,360 |  |  |  |
Allowance for Credit Losses, End of Period | 1,360 |  |  | 1,360 |  |  |  |
Securities held to maturity, fair value | 52,444 |  |  | 52,444 |  |  | 47,611 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 |  |  | 0 |  |  | 0 |
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (16,498) |  |  | (16,498) |  |  | $ (21,157) |
Municipal securities |  |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |
Allowance for Credit Losses, Beginning of Period | 140 |  | 140 | 140 |  | 140 |  |
Provision for Credit Losses | 0 |  | 0 | 0 |  | 0 |  |
Charge-offs | 0 |  | 0 | 0 |  | 0 |  |
Recoveries | 0 |  | 0 | 0 |  | 0 |  |
Allowance for Credit Losses, End of Period | 140 |  | 140 | 140 |  | 140 |  |
Corporate Debt Securities |  |  |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |  |  |
Allowance for Credit Losses, Beginning of Period | 1,360 |  | 1,360 | 1,360 |  | 1,360 |  |
Provision for Credit Losses | 0 |  | 0 | 0 |  | 0 |  |
Charge-offs | 0 |  | 0 | 0 |  | 0 |  |
Recoveries | 0 |  | 0 | 0 |  | 0 |  |
Allowance for Credit Losses, End of Period | $ 1,360 |  | $ 1,360 | $ 1,360 |  | $ 1,360 |  |
[1] | Excludes accrued interest receivable of $13.4 million at December 31, 2023 which is recorded in "Other assets" on the condensed consolidated balance sheets
[2] | Excludes accrued interest receivable of $13.4 million at June 30, 2024 which is recorded in "Other assets" on the condensed consolidated balance sheets

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- Definition Amount, excluding accrued interest, of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 + Details
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- Definition Amount of increase in allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity), from recovery. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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- Definition Amount of writeoff of investment in debt security, measured at amortized cost (held-to-maturity), charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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