COVID-19 Pandemic Implications (Narrative) (Details)	2 Months Ended	12 Months Ended
	Feb. 18, 2021 USD ($) Customer Individual	Dec. 31, 2020 USD ($) Borrower	Feb. 22, 2021 USD ($)	Jan. 26, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Unusual Risk Or Uncertainty [Line Items]
Loans and leases receivable, net, carrying amount		$ 2,370,659,000				$ 1,753,241,000
Loans and leases receivable, gross, carrying amount		$ 2,384,041,000				$ 1,762,756,000	$ 1,624,067,000
Loan modifications to number of borrowers affected by Covid | Borrower		1,000
CARES Act [Member]
Unusual Risk Or Uncertainty [Line Items]
Loans and leases receivable, gross, carrying amount		$ 11,681,000			$ 32,851,000
Qualifying deferment status percentage of loan portfolio		1.00%
Subsequent Event [Member]
Unusual Risk Or Uncertainty [Line Items]
Loans and leases receivable, gross, carrying amount			$ 290,000,000
Subsequent Event [Member] | CARES Act [Member]
Unusual Risk Or Uncertainty [Line Items]
Loans and leases receivable, gross, carrying amount				$ 8,126,000
Maximum [Member] | CARES Act [Member]
Unusual Risk Or Uncertainty [Line Items]
Qualifying deferment status percentage of loan portfolio		1.00%			1.00%
PPP Loans [Member] | Small Business Administration [Member]
Unusual Risk Or Uncertainty [Line Items]
Loans and leases receivable, net, carrying amount		$ 388,313,000
Loan guarantee description		The PPP loans, which are 100 percent guaranteed by the Small Business Administration (“SBA”), have up to a five-year term to maturity and carry a low interest rate of 1 percent throughout the loan term.
Nonrefundable loan processing fees received		$ 20,883,000
Loan processing fees		13,137,000
Deferred loan processing fees		$ 7,746,000
Amortization of loan processing fees description		The PPP loan processing fees will be amortized over the life of the respective loans.
Loans and leases receivable, gross, carrying amount		$ 396,059,000
PPP Loans [Member] | Small Business Administration [Member] | Subsequent Event [Member]
Unusual Risk Or Uncertainty [Line Items]
Loan processing fees	$ 12,800,000
Number of business customers received loan disbursement | Customer	2,047
PPP Loans [Member] | Small Business Administration [Member] | Loans and Leases, Net of Unearned Interest [Member]
Unusual Risk Or Uncertainty [Line Items]
Loans and leases receivable, gross, carrying amount		396,059,000
PPP Loans [Member] | Small Business Administration [Member] | Interest and Fees on Loans and Leases [Member]
Unusual Risk Or Uncertainty [Line Items]
Loan processing fees		13,137,000
PPP Loans [Member] | Small Business Administration [Member] | Loan Origination Cost [Member]
Unusual Risk Or Uncertainty [Line Items]
Deferred loan processing fees		$ 7,746,000
PPP Loans [Member] | Small Business Administration [Member] | Maximum [Member]
Unusual Risk Or Uncertainty [Line Items]
Loans maturity term		2 years
Percentage of processing fee per loan		5.00%
PPP Loans [Member] | Small Business Administration [Member] | Minimum [Member]
Unusual Risk Or Uncertainty [Line Items]
Percentage of processing fee per loan		1.00%
PPP Loans [Member] | Small Business Administration [Member] | Minimum [Member] | Subsequent Event [Member]
Unusual Risk Or Uncertainty [Line Items]
Loans and leases receivable, gross, carrying amount	$ 290,000,000
Number of individuals employed in business | Individual	26,000