Investment Securities - Amortized cost to Estimated Fair Value (Details) - USD ($)	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 241,586,000	$ 238,969,000
Gross Unrealized Gains	626,000	74,000
Gross Unrealized Losses	(9,572,000)	(15,413,000)
Allowance for Credit Losses	0	0
Fair Value	232,640,000	223,630,000
U.S. Treasuries
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	142,562,000	136,831,000
Gross Unrealized Gains	131,000	42,000
Gross Unrealized Losses	(6,152,000)	(10,038,000)
Allowance for Credit Losses	0	0
Fair Value	136,541,000	126,835,000
Municipal
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,617,000	11,698,000
Gross Unrealized Gains	33,000	5,000
Gross Unrealized Losses	(1,871,000)	(2,420,000)
Allowance for Credit Losses	0	0
Fair Value	13,779,000	9,283,000
Corporate
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,000,000	5,000,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(208,000)	(289,000)
Allowance for Credit Losses	0	0
Fair Value	4,792,000	4,711,000
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,152,000	5,501,000
Gross Unrealized Gains	56,000	25,000
Gross Unrealized Losses	0	0
Allowance for Credit Losses	0	0
Fair Value	5,208,000	5,526,000
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	73,255,000	79,939,000
Gross Unrealized Gains	406,000	2,000
Gross Unrealized Losses	(1,341,000)	(2,666,000)
Allowance for Credit Losses	0	0
Fair Value	$ 72,320,000	$ 77,275,000

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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