Investment Securities - Amortized Cost and Fair Value - Held-to-maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Securities Held-to-Maturity
Amortized cost, held to maturity	$ 90,264	$ 92,009
Gross unrealized (losses)	(12,816)	(15,739)
Securities held-to-maturity, fair value	77,448	76,270
Past Due
Securities Held-to-Maturity
Securities held-to-maturity, fair value	0	0
U.S. Treasuries
Securities Held-to-Maturity
Amortized cost, held to maturity	6,002	6,001
Gross unrealized (losses)	(410)	(583)
Securities held-to-maturity, fair value	5,592	5,418
U.S. government and federal agencies
Securities Held-to-Maturity
Amortized cost, held to maturity	35,332	35,349
Gross unrealized (losses)	(3,594)	(4,743)
Securities held-to-maturity, fair value	31,738	30,606
U.S. agency collateralized mortgage obligations
Securities Held-to-Maturity
Amortized cost, held to maturity	17,013	17,805
Gross unrealized (losses)	(3,420)	(3,948)
Securities held-to-maturity, fair value	13,593	13,857
Taxable municipal
Securities Held-to-Maturity
Amortized cost, held to maturity	6,032	6,041
Gross unrealized (losses)	(872)	(1,089)
Securities held-to-maturity, fair value	5,160	4,952
U.S. agency mortgage-backed
Securities Held-to-Maturity
Amortized cost, held to maturity	25,885	26,813
Gross unrealized (losses)	(4,520)	(5,376)
Securities held-to-maturity, fair value	$ 21,365	$ 21,437