Investment Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Amortized Cost
Due in 1 year or less	$ 12,496
Due after 1 year but within 5 years	34,425
Due after 5 years but within 10 years	27,475
Due after 10 years	2,331
Available-for-sale securities, amortized cost basis, Total	76,727
Amortized Cost	242,129	$ 245,886
Fair Value
Due in 1 year or less	12,380
Due after 1 year but within 5 years	32,819
Due after 5 years but within 10 years	23,743
Due after 10 years	1,925
Available-for-sale securities, fair value, Total	70,867
Available-for-sale securities, fair value	217,632	223,555
Amortized Cost
Due in 1 year or less	13,047
Due after 1 year but within 5 years	125,456
Due after 5 years but within 10 years	195,525
Due after 10 years	20,594
Held-to-maturity securities, amortized cost	354,622
Amortized Cost	396,998	399,128
Fair Value
Due in 1 year or less	12,906
Due after 1 year but within 5 years	116,182
Due after 5 years but within 10 years	168,141
Due after 10 years	17,468
Held-to-maturity securities, fair value	314,697
Held-to-maturity, Fair Value	351,204	$ 357,521
Mortgage-backed securities
Amortized Cost
Mortgage-backed securities	165,402
Fair Value
Mortgage-backed securities	146,765
Amortized Cost
Mortgage-backed securities	42,376
Fair Value
Mortgage-backed securities	$ 36,507