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COVID-19 Pandemic Implications (Narrative) (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Mar. 31, 2021
Unusual Risk Or Uncertainty [Line Items] |  |  |  |  |  |
Loans and leases receivable, gross, carrying amount | $ 2,646,236,000 | $ 2,384,041,000 | $ 2,646,236,000 | $ 1,798,149,000 | $ 2,384,041,000 | $ 2,646,236,000
CARES Act [Member] |  |  |  |  |  |
Unusual Risk Or Uncertainty [Line Items] |  |  |  |  |  |
Loans and leases receivable, gross, carrying amount | $ 5,131,000 | $ 11,681,000 | $ 5,131,000 |  | $ 11,681,000 | $ 5,131,000
Maximum [Member] | CARES Act [Member] |  |  |  |  |  |
Unusual Risk Or Uncertainty [Line Items] |  |  |  |  |  |
Qualifying deferment status percentage of loan portfolio | 1.00% | 1.00% | 1.00% |  | 1.00% | 1.00%
PPP Loans [Member] | Small Business Administration [Member] |  |  |  |  |  |
Unusual Risk Or Uncertainty [Line Items] |  |  |  |  |  |
Loan guarantee description |  |  | The PPP loans, which are 100 percent guaranteed by the 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 | $ 15,882,000 |  | $ 15,882,000 |  | $ 20,883,000 | $ 36,765,000
Loan processing fees |  |  | 5,047,000 | 0 |  |
Deferred loan processing fees not yet realized | $ 18,581,000 | $ 7,746,000 | $ 14,988,000 |  | $ 3,593,000 |
Amortization of loan processing fees description |  |  | will be amortized to interest and fees on loans and leases on the Consolidated Statements of Income over the life of each respective loan. |  |  |
PPP Loans [Member] | Small Business Administration [Member] | Interest and Fees on Loans and Leases [Member] |  |  |  |  |  |
Unusual Risk Or Uncertainty [Line Items] |  |  |  |  |  |
Loan processing fees |  |  | $ 5,047,000 | $ 0 |  |
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] | Maximum [Member] |  |  |  |  |  |
Unusual Risk Or Uncertainty [Line Items] |  |  |  |  |  |
Percentage of processing fee per loan |  |  | 5.00% |  |  |

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