Investment Securities - Amortized Cost and Fair Value - Held-to-maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Securities Held-to-Maturity
Total held to maturity securities, amortized cost	$ 87,598	$ 88,421
Gross unrealized (losses)	(10,929)	(10,846)
Securities held-to-maturity, fair value	76,669	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)	(310)	(308)
Securities held-to-maturity, fair value	5,693	5,694
U.S. government and federal agencies
Securities Held-to-Maturity
Total held to maturity securities, amortized cost	35,305	35,314
Gross unrealized (losses)	(3,026)	(2,934)
Securities held-to-maturity, fair value	32,279	32,380
U.S. agency collateralized mortgage obligations
Securities Held-to-Maturity
Total held to maturity securities, amortized cost	15,807	16,163
Gross unrealized (losses)	(3,089)	(3,006)
Securities held-to-maturity, fair value	12,718	13,157
Taxable municipal
Securities Held-to-Maturity
Total held to maturity securities, amortized cost	6,020	6,024
Gross unrealized (losses)	(720)	(754)
Securities held-to-maturity, fair value	5,300	5,270
U.S. agency mortgage-backed
Securities Held-to-Maturity
Total held to maturity securities, amortized cost	24,463	24,918
Gross unrealized (losses)	(3,784)	(3,844)
Securities held-to-maturity, fair value	$ 20,679	$ 21,074