Premises and Equipment - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property Plant And Equipment [Line Items]
Depreciation and amortization	$ 2,473,000	$ 2,519,000	$ 2,222,000
Property, plant and equipment, gross	31,382,000	56,304,000
Leasehold Improvements
Property Plant And Equipment [Line Items]
Increase (decrease) in property, plant and equipment	(9,600,000)
Property, plant and equipment, gross	16,462,000	26,104,000
Building Improvements
Property Plant And Equipment [Line Items]
Increase (decrease) in property, plant and equipment	(12,800,000)
Property, plant and equipment, gross	4,327,000	17,119,000
Furniture, Fixtures and Equipment
Property Plant And Equipment [Line Items]
Increase (decrease) in property, plant and equipment	477,000
Property, plant and equipment, gross	9,661,000	9,184,000
Land
Property Plant And Equipment [Line Items]
Increase (decrease) in property, plant and equipment	(3,000,000.0)
Property, plant and equipment, gross	932,000	$ 3,897,000
Offset Improvement
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 2,300,000