Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Other Intangible Assets
Gross Carrying amount	$ 27,693	$ 27,693
Accumulated Amortization	(10,065)	(7,278)
Total	17,628	20,415
Core deposit
Other Intangible Assets
Gross Carrying amount	25,023	25,023
Accumulated Amortization	(8,300)	(5,846)
Total	16,723	19,177
Below market-value lease
Other Intangible Assets
Gross Carrying amount	770	770
Accumulated Amortization	(641)	(451)
Total	129	319
Customer relationship and brokered relationship
Other Intangible Assets
Gross Carrying amount	1,900	1,900
Accumulated Amortization	(1,124)	(981)
Total	776	$ 919
United American Bank | Core deposit
Other Intangible Assets
Total	3,861
United American Bank | Below market-value lease
Other Intangible Assets
Total	43
Tri Valley Bank | Core deposit
Other Intangible Assets
Total	1,164
Tri Valley Bank | Below market-value lease
Other Intangible Assets
Total	164
Presidio bank | Core deposit
Other Intangible Assets
Total	9,453
Presidio bank | Below or Above market-value lease
Other Intangible Assets
Total	(78)
Focus | Core deposit
Other Intangible Assets
Total	2,245
BVF/CSNK | Customer relationship and brokered relationship
Other Intangible Assets
Total	$ 776