Securities (Narrative) (Details)	Dec. 31, 2022 USD ($) investment	Dec. 31, 2021 USD ($) investment	Dec. 31, 2009 USD ($)
Debt Securities, Available-for-sale [Line Items]
Carrying amount of securities pledged	$ 354,123,000	$ 222,896,000
Allowance for credit losses for available-for-sale securities	$ 0	$ 0
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Securities Available-for-Sale, at Fair Value (Amortized Cost $2,094,826 for December 31, 2022; Amortized Cost $1,869,198 for December 31, 2021; No Allowance for Credit Losses)	Securities Available-for-Sale, at Fair Value (Amortized Cost $2,094,826 for December 31, 2022; Amortized Cost $1,869,198 for December 31, 2021; No Allowance for Credit Losses)
Accrued interest receivable on available-for-sale securities	$ 10,637,000	$ 8,990,000
Original investment of equity security	353,000	353,000
Other than temporary impairment recognized through earnings	$ 0	$ 0
Equity Securities
Debt Securities, Available-for-sale [Line Items]
Number of equity securities held in non-controlling investment banking (in investments) | investment	1	1
Original investment of equity security			$ 1,350,000
Other than temporary impairment recognized through earnings			$ 997,000