Significant Accounting Policies - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Impaired [Line Items]
Date of discontinued recognition of interest on mortgage and commercial loans	90 days
Consumer and other retail loan due date	120 days
Interest receivable	$ 41,692,000	$ 56,459,000
Allowance for credit losses on interest deferred	$ 1,273,000	1,500,000
Minimum duration for past due residential loans to be considered as nonperforming	90 days
Impairment of company's goodwill	$ 0	$ 0	$ 0
Lock in period for interest rates	45 days
Minimum
Financing Receivable, Impaired [Line Items]
Renewal term	1 year
Minimum | Lease financing
Financing Receivable, Impaired [Line Items]
Maturity term	2 years
Minimum | Residential | Real estate – construction:
Financing Receivable, Impaired [Line Items]
Maturity term	6 months
Minimum | Commercial | Real estate – construction:
Financing Receivable, Impaired [Line Items]
Maturity term	24 months
Maximum
Financing Receivable, Impaired [Line Items]
Renewal term	20 years
Maximum | Lease financing
Financing Receivable, Impaired [Line Items]
Maturity term	5 years
Maximum | Residential | Real estate – construction:
Financing Receivable, Impaired [Line Items]
Maturity term	12 months
Maximum | Commercial | Real estate – construction:
Financing Receivable, Impaired [Line Items]
Maturity term	36 months
Premises
Financing Receivable, Impaired [Line Items]
Estimated life (in years)	40 years
Furniture and equipment | Minimum
Financing Receivable, Impaired [Line Items]
Estimated life (in years)	3 years
Furniture and equipment | Maximum
Financing Receivable, Impaired [Line Items]
Estimated life (in years)	7 years
Computer equipment | Minimum
Financing Receivable, Impaired [Line Items]
Estimated life (in years)	3 years
Computer equipment | Maximum
Financing Receivable, Impaired [Line Items]
Estimated life (in years)	5 years