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COVID-19 Pandemic Implications (Narrative) (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended | 18 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Jun. 30, 2021
Unusual Risk Or Uncertainty [Line Items] |  |  |  |  |  |  |  |
Loans and leases receivable, gross, carrying amount | $ 2,495,192,000 | $ 2,384,041,000 | $ 2,495,192,000 | $ 2,445,765,000 | $ 2,495,192,000 | $ 2,445,765,000 | $ 2,384,041,000 | $ 2,495,192,000
CARES Act [Member] |  |  |  |  |  |  |  |
Unusual Risk Or Uncertainty [Line Items] |  |  |  |  |  |  |  |
Loans and leases receivable, gross, carrying amount | $ 314,000 | $ 11,681,000 | $ 314,000 |  | $ 314,000 |  | $ 11,681,000 | $ 314,000
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% | 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 | $ 17,997,000 |  |  |  | $ 17,997,000 |  | $ 20,883,000 | $ 38,880,000
Loan processing fees |  |  | $ 6,244,000 | $ 2,731,000 | 11,291,000 | 2,371,000 |  |
Deferred loan processing fees not yet realized | $ 14,472,000 | $ 7,746,000 |  |  | $ 13,600,000 |  | $ 872,000 |
Amortization of loan processing fees description |  |  |  |  | being 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 |  |  |  |  | $ 11,291,000 | $ 2,371,000 |  |
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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