Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2020 Segment
Finite Lived Intangible Assets [Line Items]
Maximum maturity period for cash equivalents	90 days
Number of investment portfolios	3
Number of securities held as trading securities	0
Useful lives of premises and equipment	three to forty years
Number of reportable segments	2
Core Deposits [Member]
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	7 years