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Loans and Allowance for Credit Losses on Loans (Composition of Loan Portfolio, Excluding Residential Loans Held for Sale) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 3,219,822 |  |
Loans | 3,219,822 | $ 3,095,023 | $ 3,026,222
Residential real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 1,054,798 | 1,070,374 |
Loans | 1,054,798 | 1,070,374 | 992,866
Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 1,369,470 | 1,243,397 |
Loans |  | 1,243,397 | 1,269,533
Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 381,494 | 442,701 |
Loans | 381,494 | 442,701 | 415,436
Home equity |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 258,573 | 312,779 |
Loans | 258,573 | 312,779 | 327,763
Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 20,392 | 25,772 |
Loans | 20,392 | 25,772 | $ 20,624
SBA PPP Portfolio Segment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 135,095 | 0 |
Loans | 135,095 |  |
Commercial Loan |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 1,886,059 | 1,686,098 |
Retail Loan |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 1,333,763 | $ 1,408,925 |
Commercial real estate, non owner-occupied |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 1,100,000 |  |
Commercial real estate, owner-occupied |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 271,500 |  |

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524 + Details
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