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COVID-19 Pandemic Implications (Narrative) (Details) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) Borrower | Oct. 26, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($)
Unusual Risk Or Uncertainty [Line Items] |  |  |  |  |  |
Loans and leases receivable, net, carrying amount | $ 2,509,657,000 | $ 2,509,657,000 |  |  | $ 1,753,241,000 |
Loans and leases receivable, gross, carrying amount | 2,521,827,000 | $ 2,521,827,000 |  |  | $ 1,762,756,000 | $ 1,710,434,000
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 | $ 32,851,000 | $ 32,851,000 |  | $ 444,486,000 |  |
Qualifying deferment status percentage of loan portfolio | 1.00% | 1.00% |  | 18.00% |  |
CARES Act [Member] | Subsequent Event [Member] |  |  |  |  |  |
Unusual Risk Or Uncertainty [Line Items] |  |  |  |  |  |
Loans and leases receivable, gross, carrying amount |  |  | $ 11,804,000 |  |  |
Qualifying deferment status percentage of loan portfolio |  |  | 1.00% |  |  |
PPP Loans [Member] | Small Business Administration [Member] |  |  |  |  |  |
Unusual Risk Or Uncertainty [Line Items] |  |  |  |  |  |
Loans and leases receivable, net, carrying amount | $ 613,924,000 | $ 613,924,000 |  |  |  |
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 | 2,583,000 | 4,954,000 |  |  |  |
Deferred loan processing fees | 15,929,000 | $ 15,929,000 |  |  |  |
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 | 629,853,000 | $ 629,853,000 |  |  |  |
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 | 629,853,000 | 629,853,000 |  |  |  |
PPP Loans [Member] | Small Business Administration [Member] | Interest and Fees on Loans and Leases [Member] |  |  |  |  |  |
Unusual Risk Or Uncertainty [Line Items] |  |  |  |  |  |
Loan processing fees | 2,583,000 | 4,954,000 |  |  |  |
PPP Loans [Member] | Small Business Administration [Member] | Loan Origination Cost [Member] |  |  |  |  |  |
Unusual Risk Or Uncertainty [Line Items] |  |  |  |  |  |
Deferred loan processing fees | $ 15,929,000 | $ 15,929,000 |  |  |  |
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% |  |  |  |

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