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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 |  |  |  |  |  |

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