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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 |
--- | --- | ---
Mar. 31, 2021 USD ($) loans | Mar. 31, 2020 USD ($) loans | Dec. 31, 2020 USD ($)
Financing Receivable, Recorded Investment |  |  |
SBA Paycheck Protection Program Loans Outstanding, Gross Amount | $ 272,700,000 |  | $ 228,900,000
Paycheck Protection Loans and Leases Receivable, Deferred Income | 5,100,000 |  | 3,500,000
SBA loans in the participation sold portfolio, considered impaired | 8,600,000 |  | 9,300,000
Guaranteed portion of SBA loans sold to third parties | 10,600,000 | $ 2,700,000 |
Total amount of outstanding SBA loans sold | 82,700,000 |  | 79,500,000
Loans and leases transferred to third parties total principal amount | 5,200,000 | $ 11,900,000 |
Gain (Loss) Recognized on Participation Interest in Originated Loans | 0 |  |
Total amount of outstanding loans transferred to third parties as loan participations | 151,300,000 |  | 153,600,000
Total amount of loan participations remaining on the Corporations balance sheet | 259,900,000 |  | 276,500,000
Loans in the participation sold portfolio, considered impaired, gross amount | 3,000,000.0 |  |
Loans in the participation sold portfolio, considered impaired, sold amount | 4,200,000 |  |
Loan participations purchased on the Corporation's balance sheet | 0 |  | 410,000
Non-accrual troubled debt restructurings | 4,800,000 |  | 6,500,000
Specific Reserves on Troubled Debt Restructurings | 765,000 |  | 760,000
Unfunded commitments, troubled debt restructurings | 0 |  |
Loans modified to a troubled debt restructuring | loans |  | 6 |
Loans and leases receivable, difference between recorded investment and unpaid principal balance | 5,500,000 |  | 14,600,000
Performing troubled debt restructurings | $ 59,000 |  | $ 46,000
Commercial real estate — owner occupied |  |  |
Financing Receivable, Recorded Investment |  |  |
Loans modified to a troubled debt restructuring | loans |  | 2 |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loans |  | 2 |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default |  | $ 3,600,000 |
Commercial and industrial |  |  |
Financing Receivable, Recorded Investment |  |  |
Loans modified to a troubled debt restructuring | loans | 0 | 4 |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts | loans | 0 | 1 |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default |  | $ 2,100,000 |

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