Investment Securities - Amortized Cost and Fair Value - Held-to-maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Securities Held-to-Maturity
Total held to maturity securities, amortized cost	$ 85,818	$ 88,421
Gross unrealized (losses)	(13,118)	(10,846)
Securities held-to-maturity, fair value	72,700	77,575
Past Due
Securities Held-to-Maturity
Securities held-to-maturity, fair value	0	0
U.S. Treasuries
Securities Held-to-Maturity
Total held to maturity securities, amortized cost	6,003	6,002
Gross unrealized (losses)	(302)	(308)
Securities held-to-maturity, fair value	5,701	5,694
U.S. government and federal agencies
Securities Held-to-Maturity
Total held to maturity securities, amortized cost	35,288	35,314
Gross unrealized (losses)	(3,698)	(2,934)
Securities held-to-maturity, fair value	31,590	32,380
U.S. agency collateralized mortgage obligations
Securities Held-to-Maturity
Total held to maturity securities, amortized cost	15,025	16,163
Gross unrealized (losses)	(3,569)	(3,006)
Securities held-to-maturity, fair value	11,456	13,157
Taxable municipal
Securities Held-to-Maturity
Total held to maturity securities, amortized cost	6,011	6,024
Gross unrealized (losses)	(934)	(754)
Securities held-to-maturity, fair value	5,077	5,270
U.S. agency mortgage-backed
Securities Held-to-Maturity
Total held to maturity securities, amortized cost	23,491	24,918
Gross unrealized (losses)	(4,615)	(3,844)
Securities held-to-maturity, fair value	$ 18,876	$ 21,074