Segment Reporting (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) item segment	Sep. 30, 2022 USD ($)
Segment Reporting
Number of operating segments | segment			4
Number of banking offices | item			14
Key metrics related to segments
Net interest income (loss)	$ 20,395	$ 28,316	$ 66,287	$ 72,765
Provision for credit losses			550
Noninterest income (loss)	28,407	27,010	79,439	85,706
Noninterest expense	37,260	42,767	111,503	120,822
Net income (loss) before taxes	11,542	12,559	33,673	37,649
Corporate Administration
Key metrics related to segments
Net interest income (loss)	(678)	(589)	(1,998)	(1,711)
Noninterest income (loss)	(129)	56	107	91
Intercompany revenue (expense)		1,478	3,221	3,783
Noninterest expense	11,211	12,066	34,071	35,368
Net income (loss) before taxes	(12,018)	(11,121)	(32,741)	(33,205)
Banking | Operating Segments
Key metrics related to segments
Net interest income (loss)	20,818	28,512	67,650	72,816
Provision for credit losses			550
Noninterest income (loss)	2,150	1,723	6,308	4,602
Intercompany revenue (expense)	(9,371)	(4,562)	(15,351)	(8,664)
Noninterest expense	10,728	15,428	36,231	39,639
Net income (loss) before taxes	2,869	10,245	21,826	29,115
Retirement and Benefit Services | Operating Segments
Key metrics related to segments
Noninterest income (loss)	18,605	16,597	49,977	50,536
Intercompany revenue (expense)	4,264	1,868	6,936	2,695
Noninterest expense	9,354	7,998	24,954	23,855
Net income (loss) before taxes	13,515	10,467	31,959	29,376
Wealth Management | Operating Segments
Key metrics related to segments
Noninterest income (loss)	5,271	4,852	15,915	15,726
Intercompany revenue (expense)	4,624	(170)	4,200	(1,028)
Noninterest expense	2,722	1,406	6,335	4,034
Net income (loss) before taxes	7,173	3,276	13,780	10,664
Mortgage | Operating Segments
Key metrics related to segments
Net interest income (loss)	255	393	635	1,660
Noninterest income (loss)	2,510	3,782	7,132	14,751
Intercompany revenue (expense)	483	1,386	994	3,214
Noninterest expense	3,245	5,869	9,912	17,926
Net income (loss) before taxes	$ 3	$ (308)	$ (1,151)	$ 1,699