Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill
Goodwill	$ 167,631,000	$ 167,420,000	$ 83,753,000
Goodwill acquired		83,878,000	38,039,000
BVF/CSNK
Goodwill
Goodwill acquired	13,044,000
Focus
Goodwill
Goodwill acquired	32,619,000
Tri Valley Bank
Goodwill
Goodwill	13,819,000
Goodwill acquired	13,819,000
United American Bank
Goodwill
Goodwill	24,271,000
Goodwill acquired	24,271,000
Presidio bank
Goodwill
Goodwill	83,878,000
Goodwill acquired	83,878,000
Banking
Goodwill
Goodwill	154,587,000	154,376,000	70,709,000
Factoring
Goodwill
Goodwill	$ 13,044,000	$ 13,044,000	$ 13,044,000