Long-Term Debt and FHLB Stock (Narrative) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2024 USD ($) subsidiary $ / shares	Dec. 31, 2023 USD ($) $ / shares	Dec. 31, 2005 USD ($) $ / shares shares
Long-Term Debt And Federal Home Loan Bank [Line Items]
Number Of Wholly Owned Subsidiaries | subsidiary	1
Common stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01
Advances from the Federal Home Loan Bank	$ 108,064,000	$ 128,064,000
Zions Bank
Long-Term Debt And Federal Home Loan Bank [Line Items]
Line of credit, maximum borrowing capacity	10,000,000	10,000,000
Line of credit facility, maximum amount outstanding during period	0	0
Pacific Community Bankers Bank
Long-Term Debt And Federal Home Loan Bank [Line Items]
Line of credit, maximum borrowing capacity	50,000,000	50,000,000
Line of credit facility, maximum amount outstanding during period	$ 0	$ 0
Subordinated Debt.
Long-Term Debt And Federal Home Loan Bank [Line Items]
Interest rate, variable rate basis	three month term Secured Overnight Financing Rate (“SOFR”)	three month term Secured Overnight Financing Rate (“SOFR”)
Effective interest during period	7.58%	7.64%
Subordinated debt securities	$ 5,155,000
Stated maturity date	May 23, 2035
Subordinated Debt. | SOFR
Long-Term Debt And Federal Home Loan Bank [Line Items]
Interest variable rate	2.00%	2.00%
Relative spread adjustment	0.26%	0.26%
Subordinated Debt. | RSB Capital Trust I
Long-Term Debt And Federal Home Loan Bank [Line Items]
Trust term	30 years
Subordinated Debt. | Private placement | RSB Capital Trust I
Long-Term Debt And Federal Home Loan Bank [Line Items]
Number of preferred securities issued			$ 5,000
Common stock issued | shares			155
Common stock, par value (in dollars per share) | $ / shares			$ 1
Federal Home Loan Bank of New York ("FHLBNY")
Long-Term Debt And Federal Home Loan Bank [Line Items]
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available	$ 649,283,000	$ 656,516,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	227,899,000	228,172,000
Impairment Related To Federal Home Loan Stock	0	0
Federal Home Loan Bank of New York ("FHLBNY") | Maturity Overnight [Member]
Long-Term Debt And Federal Home Loan Bank [Line Items]
Advances from the Federal Home Loan Bank	$ 0	$ 0