Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Other Intangible Assets
Gross Carrying amount	$ 27,693	$ 27,693
Accumulated Amortization	(9,100)	(7,278)
Total	18,593	20,415
Core deposit
Other Intangible Assets
Gross Carrying amount	25,023	25,023
Accumulated Amortization	(7,446)	(5,846)
Total	17,577	19,177
Below market-value lease
Other Intangible Assets
Gross Carrying amount	770	770
Accumulated Amortization	(578)	(451)
Total	192	319
Customer relationship and brokered relationship
Other Intangible Assets
Gross Carrying amount	1,900	1,900
Accumulated Amortization	(1,076)	(981)
Total	824	$ 919
United American Bank | Core deposit
Other Intangible Assets
Total	4,027
United American Bank | Below market-value lease
Other Intangible Assets
Total	109
Tri Valley Bank | Core deposit
Other Intangible Assets
Total	1,216
Tri Valley Bank | Below market-value lease
Other Intangible Assets
Total	168
Presidio bank | Core deposit
Other Intangible Assets
Total	9,909
Presidio bank | Below or Above market-value lease
Other Intangible Assets
Total	(83)
Focus | Core deposit
Other Intangible Assets
Total	2,423
BVF/CSNK | Customer relationship and brokered relationship
Other Intangible Assets
Total	$ 824