Basis of Presentation - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) loanPortfolioPool segment branch	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of full-service branches | branch	81
Provision for credit losses on available-for-sale securities	$ 0	$ 0
Percent of remaining principal allowed to buy back under GNMA optional repurchase programs	100.00%
Number of loan portfolio pools | loanPortfolioPool	3
Impairment of long-lived assets	$ 0	0
Goodwill impairment	0
Amounts related to uncertain tax positions	$ 0	$ 0	$ 0
Number of reporting segments | segment	2
PSUs
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Performance period	3 years
Premises
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, useful life	40 years
Furniture, fixtures and equipment | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, useful life	3 years
Furniture, fixtures and equipment | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, useful life	10 years
Leasehold improvements
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Property, plant and equipment, useful life	10 years