Commitments, Contingencies and Credit Risk - Financial Instruments Whose Contractual Amounts Represent Credit Risk (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value Concentration Of Risk Financial Statement Captions [Line Items]
Contractual amounts represent credit risk	$ 605,630	$ 591,507
Commitments to Grant Mortgage Loans
Fair Value Concentration Of Risk Financial Statement Captions [Line Items]
Contractual amounts represent credit risk	540,823	529,768
Unfunded Commitments Under Lines of Credit
Fair Value Concentration Of Risk Financial Statement Captions [Line Items]
Contractual amounts represent credit risk	$ 64,807	$ 61,739

This item represents disclosure of all significant concentrations of credit risk or market risk arising from the subject financial instrument (as defined), whether from an individual counterparty or groups of counterparties.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(17))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(25))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Name:	us-gaap_FairValueConcentrationOfRiskCommitments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant