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Loan and Lease Receivables, Impaired Loans and Leases and Allowance for Loan and Lease Losses (Narrative Disclosures) (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) loans | Sep. 30, 2020 USD ($) loans | Sep. 30, 2021 USD ($) loans | Sep. 30, 2020 USD ($) loans | Dec. 31, 2020 USD ($)
Financing Receivable, Recorded Investment |  |  |  |  |
SBA Paycheck Protection Program Loans Outstanding, Gross Amount | $ 65,900,000 |  | $ 65,900,000 |  | $ 228,900,000
Paycheck Protection Loans and Leases Receivable, Deferred Income | 1,400,000 |  | 1,400,000 |  | 3,500,000
SBA loans in the participation sold portfolio, considered impaired | 1,900,000 |  | 1,900,000 |  | 9,300,000
Guaranteed portion of SBA loans sold to third parties | 5,300,000 | $ 7,900,000 | 25,000,000 | $ 17,200,000 |
Total amount of outstanding SBA loans sold | 90,500,000 |  | 90,500,000 |  | 79,500,000
Loans and leases transferred to third parties total principal amount | 18,900,000 | $ 7,700,000 | 35,800,000 | $ 29,900,000 |
Gain (Loss) Recognized on Participation Interest in Originated Loans |  |  | 0 |  |
Total amount of outstanding loans transferred to third parties as loan participations | 172,200,000 |  | 172,200,000 |  | 153,600,000
Total amount of loan participations remaining on the Corporations balance sheet | 293,700,000 |  | 293,700,000 |  | 276,500,000
Loans in the participation sold portfolio, considered impaired, gross amount | 0 |  | 0 |  | 3,000,000
Loans in the participation sold portfolio, considered impaired, sold amount |  |  |  |  | 4,200,000
Loan participations purchased on the Corporation's balance sheet | 0 |  | 0 |  | 410,000
Non-accrual troubled debt restructurings | 857,000 |  | 857,000 |  | 6,500,000
Specific Reserves on Troubled Debt Restructurings | 201,000 |  | 201,000 |  | 760,000
Unfunded commitments, troubled debt restructurings | 0 |  | 0 |  |
Loans and leases receivable, difference between recorded investment and unpaid principal balance | 144,000 |  | 144,000 |  | 14,600,000
Performing troubled debt restructurings | $ 53,000 |  | $ 53,000 |  | $ 46,000
Commercial real estate — owner occupied |  |  |  |  |
Financing Receivable, Recorded Investment |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loans |  | 2 |  | 2 |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default |  | $ 272,000 |  | $ 272,000 |
Commercial and industrial |  |  |  |  |
Financing Receivable, Recorded Investment |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loans | 1 | 2 | 1 | 2 |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 281,000 | $ 703,000 | $ 281,000 | $ 703,000 |

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