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Federal Home Loan Bank Advances - Summary of FHLB Advances (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Federal Home Loan Bank, Advances [Line Items] |  |
FHLB advances (fixed rates 0.00% to 5.61% and variable rates 5.35% to 5.36%) maturing December 2023 to September 2042 | $ 4,450,528 | $ 3,850,677
Fair value hedge basis adjustments and unamortized prepayment fees | (37,952) | (21,659)
Federal Home Loan Bank advances | $ 4,412,576 | $ 3,829,018
Minimum | FHLB Advances |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Fixed rate (in percent) | 0.00% |
Variable rate (in percent) | 5.35% |
Maximum | FHLB Advances |  |
Federal Home Loan Bank, Advances [Line Items] |  |
Fixed rate (in percent) | 5.61% |
Variable rate (in percent) | 5.36% |

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- Definition Advances From Federal Home Loan Banks, Fair Value Hedge Basis adjustments And Unamortized Prepayment Fees + References No definition available. + Details
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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480876/942-470-45-1 + Details
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- Definition Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480876/942-470-45-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480848/942-470-50-2 + Details
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