Acquisition of First Priority Financial Corp. (Allocation of Purchase Price) (Details) - USD ($)	Jul. 31, 2018	Sep. 30, 2019	Dec. 31, 2018
Assets acquired:
Goodwill		$ 62,840,000	$ 62,840,000
First Priority Financial Corp. [Member]
Assets acquired:
Cash and cash equivalents	$ 11,398,000
Investment securities	62,977,000
Restricted stock	2,237,000
Loans	511,623,000
Goodwill	39,744,000
Core deposit intangible	2,832,000
Trade name intangible	205,000
Premises and equipment	1,147,000
Foreclosed assets	125,000
Deferred income taxes	3,140,000
Accrued interest receivable	2,293,000
Other assets	4,197,000
Total assets acquired	641,918,000
Liabilities assumed:
Deposits	504,946,000
Borrowings	49,939,000
Accrued interest payable	1,073,000
Other liabilities	2,627,000
Total liabilities assumed	558,585,000
Equity acquired:
Preferred stock	3,404,000
Total equity acquired and liabilities assumed	561,989,000
Consideration paid	79,929,000
Cash paid	3,807,000
Fair value of common stock issued	$ 76,122,000