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Loans, Allowance for Credit Losses and Credit Quality Financing Receivable, Allowance for Credit Loss (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 115,625 | $ 115,625 | $ 112,176 | $ 67,740
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  | (1,137) |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase |  | 1,157 |  |
Allowance for Loan and Lease Losses, Write-offs | (4,304) | (5,748) |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 253 | 1,113 |  |
Provision for Loan and Lease Losses | 7,500 | 52,500 |  |
Commercial And Industrial [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 28,219 | 28,219 | 25,662 | 17,594
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  | (1,984) |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase |  | 49 |  |
Allowance for Loan and Lease Losses, Write-offs | (185) | (185) |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 1 | 47 |  |
Provision for Loan and Lease Losses | 2,741 | 12,698 |  |
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 39,386 | 39,386 | 36,956 | 32,935
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  | (13,048) |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase |  | 337 |  |
Allowance for Loan and Lease Losses, Write-offs | (3,885) | (3,885) |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 9 | 9 |  |
Provision for Loan and Lease Losses | 6,306 | 23,038 |  |
Construction Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 5,210 | 5,210 | 4,501 | 6,053
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  | (3,652) |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase |  | 0 |  |
Allowance for Loan and Lease Losses, Write-offs | 0 | 0 |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 0 | 0 |  |
Provision for Loan and Lease Losses | 709 | 2,809 |  |
Small Business [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 4,593 | 4,593 | 4,561 | 1,746
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  | 495 |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase |  | 0 |  |
Allowance for Loan and Lease Losses, Write-offs | (49) | (194) |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 2 | 8 |  |
Provision for Loan and Lease Losses | 79 | 2,538 |  |
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 14,163 | 14,163 | 15,046 | 3,440
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  | 9,828 |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase |  | 423 |  |
Allowance for Loan and Lease Losses, Write-offs | 0 | 0 |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 1 | 2 |  |
Provision for Loan and Lease Losses | (884) | 470 |  |
Home Equity Line of Credit [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 23,572 | 23,572 | 24,860 | 5,576
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  | 7,012 |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase |  | 319 |  |
Allowance for Loan and Lease Losses, Write-offs | 0 | (142) |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 21 | 174 |  |
Provision for Loan and Lease Losses | (1,309) | 10,633 |  |
Consumer - Other [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 482 | 482 | $ 590 | $ 396
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  | 212 |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration, Increase |  | 29 |  |
Allowance for Loan and Lease Losses, Write-offs | (185) | (1,342) |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 219 | 873 |  |
Provision for Loan and Lease Losses | $ (142) | $ 314 |  |

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- Definition Amount of increase in allowance for credit loss on financing receivable purchased with credit deterioration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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