Investment Securities - Amortized cost and estimated fair value (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Carrying Value
Due within one year or less	$ 7,992
Due after one year through five years	51,078
Due after five years through ten years	52,362
Due after 10 years	11,841
Held-to-maturity securities carrying value	123,273
Amortized Cost	286,683	$ 299,728
Estimated Fair Value
Due within one year or less	7,823
Due after one year through five years	46,779
Due after five years through ten years	45,159
Due after 10 years	10,192
Total investment securities	109,953
Debt Securities, Held-to-maturity, Fair Value, Total	243,689	258,617
Amortized Cost
Due after one year through five years	1,868
Due after five years through ten years	57,995
Due after 10 years	379
Total investment securities available-for-sale	60,242
Total investment securities, Amortized Cost	561,960	584,754
Fair Value
Due after one year through five years	1,754
Due after five years through ten years	49,421
Due after 10 years	382
Total investment securities available-for-sale	51,557
Debt Securities, Available-for-sale, Total	459,345	486,736
Mortgage backed securities - Residential agency
Carrying Value
Mortgage-backed securities, Carrying value	163,410
Amortized Cost	163,410	170,125
Estimated Fair Value
Mortgage-backed securities, Fair value	133,736
Debt Securities, Held-to-maturity, Fair Value, Total	133,736	141,627
Amortized Cost
Mortgage-backed securities, Amortized Cost	501,718
Fair Value
Mortgage-backed securities, Fair value	407,788
Debt Securities, Available-for-sale, Total	$ 407,788	$ 435,594