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Fair Value - Level 3 Inputs (Details) - Level 3 $ in Thousands	Sep. 30, 2023 USD ($)
Multifamily
Fair Value
Impaired loans, fair value	$ 70,246
Multifamily | Capitalization rate
Fair Value
Impaired loans, measurement input	6.53
Land
Fair Value
Impaired loans, fair value	$ 50,000
Land | Discount rate
Fair Value
Impaired loans, measurement input	21.50
Land | Revenue growth rate
Fair Value
Impaired loans, measurement input	3.00
Office
Fair Value
Impaired loans, fair value	$ 37,074
Office | Discount rate
Fair Value
Impaired loans, measurement input	7.50
Office | Capitalization rate
Fair Value
Impaired loans, measurement input	5.25
Office | Revenue growth rate
Fair Value
Impaired loans, measurement input	3.00
Retail
Fair Value
Impaired loans, fair value	$ 11,851
Retail | Discount rate
Fair Value
Impaired loans, measurement input	11.25
Retail | Capitalization rate
Fair Value
Impaired loans, measurement input	9.25
Retail | Revenue growth rate
Fair Value
Impaired loans, measurement input	3.00
Rate lock commitments
Fair Value
Derivative financial instruments	$ 962
Derivative Asset, Valuation Technique [Extensible List]	Valuation Technique, Discounted Cash Flow [Member]
Derivative Asset, Measurement Input [Extensible List]	Discount rate
Rate lock commitments | Discount rate
Fair Value
Impaired loans, measurement input	12.27

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