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Segment Reporting (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) item segment	Mar. 31, 2020 USD ($)
Segment Reporting
Number of operating segments | segment	4
Number of banking offices | item	14
Key metrics related to segments
Net interest income	$ 22,038	$ 18,837
Provision for loan losses		2,500
Noninterest income	40,881	27,189
Noninterest expense	43,042	36,726
Net income before taxes	19,877	6,800
Corporate Administration
Key metrics related to segments
Net interest income	(288)	(877)
Noninterest income	(14)	4
Noninterest expense	8,658	9,188
Net income before taxes	(8,960)	(10,061)
Banking | Operating Segments
Key metrics related to segments
Net interest income	21,880	19,446
Provision for loan losses		2,500
Noninterest income	1,522	1,874
Noninterest expense	11,084	12,653
Net income before taxes	12,318	6,167
Retirement and Benefit Services | Operating Segments
Key metrics related to segments
Noninterest income	17,255	16,220
Noninterest expense	10,112	7,931
Net income before taxes	7,143	8,289
Wealth Management | Operating Segments
Key metrics related to segments
Noninterest income	4,986	4,046
Noninterest expense	2,335	1,515
Net income before taxes	2,651	2,531
Mortgage | Operating Segments
Key metrics related to segments
Net interest income	446	268
Noninterest income	17,132	5,045
Noninterest expense	10,853	5,439
Net income before taxes	$ 6,725	$ (126)

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