Segment Reporting (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) item segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting
Number of operating segments | segment	4
Number of banking offices | item	15
Key metrics related to segments
Net interest income (loss)	$ 87,839	$ 99,729	$ 87,099
Provision for credit losses	2,057		(3,500)
Noninterest income (loss)	80,229	111,223	147,387
Noninterest expense	150,157	158,770	168,909
Net income (loss) before taxes	15,854	52,182	69,077
Total assets	3,907,713	3,779,637	3,392,691
Corporate Administration
Key metrics related to segments
Net interest income (loss)	(2,681)	(2,340)	(1,896)
Noninterest income (loss)	97	98	33
Noninterest expense	7,744	7,655	8,897
Net income (loss) before taxes	(10,328)	(9,897)	(10,760)
Total assets	34,879	26,556	13,402
Banking | Operating Segments
Key metrics related to segments
Net interest income (loss)	89,693	100,190	87,014
Provision for credit losses	2,057		(3,500)
Noninterest income (loss)	(15,428)	6,199	6,091
Noninterest expense	61,023	62,789	53,121
Net income (loss) before taxes	11,185	43,600	43,484
Total assets	3,821,989	3,697,608	3,254,979
Retirement and Benefit Services | Operating Segments
Key metrics related to segments
Noninterest income (loss)	65,294	67,135	71,709
Noninterest expense	53,307	55,178	55,802
Net income (loss) before taxes	11,987	11,957	15,907
Total assets	34,352	40,821	44,953
Wealth Management | Operating Segments
Key metrics related to segments
Noninterest income (loss)	21,855	20,870	21,052
Noninterest expense	13,477	11,876	11,571
Net income (loss) before taxes	8,378	8,994	9,481
Total assets	4,757	4,032	3,644
Mortgage | Operating Segments
Key metrics related to segments
Net interest income (loss)	827	1,879	1,981
Noninterest income (loss)	8,411	16,921	48,502
Noninterest expense	14,606	21,272	39,518
Net income (loss) before taxes	(5,368)	(2,472)	10,965
Total assets	$ 11,736	$ 10,620	$ 75,713