Segment Reporting (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) item segment	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting
Number of operating segments | segment	4
Number of banking offices | item	14
Key metrics related to segments
Net interest income	$ 99,729	$ 87,099	$ 83,846
Provision for loan losses		(3,500)	10,900
Noninterest income	111,223	147,387	149,371
Noninterest expense	158,770	168,909	163,799
Net income before taxes	52,182	69,077	58,518
Total assets	3,779,637	3,392,691	3,013,771
Corporate Administration
Key metrics related to segments
Net interest income	(2,340)	(1,896)	(3,413)
Noninterest income	98	33	(694)
Noninterest expense	40,929	37,725	37,068
Net income before taxes	(43,171)	(39,588)	(41,175)
Total assets	27,488	13,402	10,134
Banking | Operating Segments
Key metrics related to segments
Net interest income	100,190	87,014	85,167
Provision for loan losses		(3,500)	10,900
Noninterest income	6,199	6,091	10,017
Noninterest expense	67,068	44,989	46,883
Net income before taxes	39,321	51,616	37,401
Total assets	3,696,676	3,254,979	2,827,792
Retirement and Benefit Services | Operating Segments
Key metrics related to segments
Noninterest income	67,135	71,709	60,956
Noninterest expense	26,204	40,164	35,236
Net income before taxes	40,931	31,545	25,720
Total assets	40,821	44,953	47,758
Wealth Management | Operating Segments
Key metrics related to segments
Noninterest income	20,870	21,052	17,451
Noninterest expense	5,979	8,869	8,289
Net income before taxes	14,891	12,183	9,162
Total assets	4,032	3,644	3,009
Mortgage | Operating Segments
Key metrics related to segments
Net interest income	1,879	1,981	2,092
Noninterest income	16,921	48,502	61,641
Noninterest expense	18,590	37,162	36,323
Net income before taxes	210	13,321	27,410
Total assets	$ 10,620	$ 75,713	$ 125,078