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Allowance for Credit Losses (Held-to-Maturity Debt Securities by Credit Quality Indication) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
Amortized Cost | $ 3,641,055 | $ 2,942,363
Less: Allowance for credit losses | (488) | (78)
Held-to-maturity securities, net of allowance for credit losses | 3,640,567 | 2,942,285
U.S. government agencies |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
2022 | 160,000 |
2021 | 147,802 |
2020 | 25,000 |
2019 | 4,000 |
2018 | 0 |
Prior | 2,812 |
Amortized Cost | 339,614 | 180,192
U.S. government agencies | 1-4 internal grade |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
2022 | 160,000 |
2021 | 147,802 |
2020 | 25,000 |
2019 | 4,000 |
2018 | 0 |
Prior | 2,812 |
Amortized Cost | 339,614 |
U.S. government agencies | 5-7 internal grade |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
2022 | 0 |
2021 | 0 |
2020 | 0 |
2019 | 0 |
2018 | 0 |
Prior | 0 |
Amortized Cost | 0 |
U.S. government agencies | 8-10 internal grade |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
2022 | 0 |
2021 | 0 |
2020 | 0 |
2019 | 0 |
2018 | 0 |
Prior | 0 |
Amortized Cost | 0 |
Municipal |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
2022 | 1,045 |
2021 | 7,001 |
2020 | 269 |
2019 | 159 |
2018 | 7,401 |
Prior | 163,153 |
Amortized Cost | 179,027 | $ 187,486
Municipal | 1-4 internal grade |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
2022 | 1,045 |
2021 | 7,001 |
2020 | 269 |
2019 | 159 |
2018 | 7,401 |
Prior | 163,153 |
Amortized Cost | 179,027 |
Municipal | 5-7 internal grade |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
2022 | 0 |
2021 | 0 |
2020 | 0 |
2019 | 0 |
2018 | 0 |
Prior | 0 |
Amortized Cost | 0 |
Municipal | 8-10 internal grade |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
2022 | 0 |
2021 | 0 |
2020 | 0 |
2019 | 0 |
2018 | 0 |
Prior | 0 |
Amortized Cost | 0 |
Mortgage-backed securities |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
2022 | 616,478 |
2021 | 2,447,704 |
2020 | 0 |
2019 | 0 |
2018 | 0 |
Prior | 0 |
Amortized Cost | 3,064,182 |
Mortgage-backed securities | 1-4 internal grade |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
2022 | 616,478 |
2021 | 2,447,704 |
2020 | 0 |
2019 | 0 |
2018 | 0 |
Prior | 0 |
Amortized Cost | 3,064,182 |
Mortgage-backed securities | 5-7 internal grade |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
2022 | 0 |
2021 | 0 |
2020 | 0 |
2019 | 0 |
2018 | 0 |
Prior | 0 |
Amortized Cost | 0 |
Mortgage-backed securities | 8-10 internal grade |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
2022 | 0 |
2021 | 0 |
2020 | 0 |
2019 | 0 |
2018 | 0 |
Prior | 0 |
Amortized Cost | 0 |
Corporate notes |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
2022 | 14,963 |
2021 | 0 |
2020 | 6,010 |
2019 | 7,312 |
2018 | 3,182 |
Prior | 26,765 |
Amortized Cost | 58,232 |
Corporate notes | 1-4 internal grade |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
2022 | 14,963 |
2021 | 0 |
2020 | 6,010 |
2019 | 7,312 |
2018 | 3,182 |
Prior | 26,765 |
Amortized Cost | 58,232 |
Corporate notes | 5-7 internal grade |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
2022 | 0 |
2021 | 0 |
2020 | 0 |
2019 | 0 |
2018 | 0 |
Prior | 0 |
Amortized Cost | 0 |
Corporate notes | 8-10 internal grade |  |
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items] |  |
2022 | 0 |
2021 | 0 |
2020 | 0 |
2019 | 0 |
2018 | 0 |
Prior | 0 |
Amortized Cost | $ 0 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 + Details
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