Significant Accounting Policies (Details)			12 Months Ended
	Oct. 10, 2018 USD ($) Branch	Oct. 09, 2018 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Acquisitions [Abstract]
Gain on remeasurement of previously held equity investment			$ 0	$ 0	$ 997,000
Assets			$ 4,550,453,000	$ 3,721,830,000
Bank of Rio Vista [Member]
Acquisitions [Abstract]
Percentage of equity interest in acquiree prior to acquisition of remaining interest		39.65%
Gain on remeasurement of previously held equity investment		$ 997,000
Assets	$ 217,500,000
Number of branches | Branch	3