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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 | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 112,176 | $ 112,176 | $ 92,376 | $ 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 | (710) | (1,444) |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 510 | 860 |  |
Provision for Loan and Lease Losses | 20,000 | 45,000 |  |
Commercial And Industrial [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 25,662 | 25,662 | 21,649 | 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 | 0 | 0 |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 4 | 46 |  |
Provision for Loan and Lease Losses | 4,009 | 9,957 |  |
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 36,956 | 36,956 | 29,498 | 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 | 0 | 0 |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 0 | 0 |  |
Provision for Loan and Lease Losses | 7,458 | 16,732 |  |
Construction Loans [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 4,501 | 4,501 | 3,747 | 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 | 754 | 2,100 |  |
Small Business [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 4,561 | 4,561 | 3,829 | 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 | (36) | (145) |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 3 | 6 |  |
Provision for Loan and Lease Losses | 765 | 2,459 |  |
Residential Real Estate [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 15,046 | 15,046 | 14,847 | 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 | 0 | 1 |  |
Provision for Loan and Lease Losses | 199 | 1,354 |  |
Home Equity Line of Credit [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 24,860 | 24,860 | 17,910 | 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 | (4) | (142) |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 95 | 153 |  |
Provision for Loan and Lease Losses | 6,859 | 11,942 |  |
Consumer - Other [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 590 | 590 | $ 896 | $ 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 | (670) | (1,157) |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts | 408 | 654 |  |
Provision for Loan and Lease Losses | $ (44) | $ 456 |  |

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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=119407570&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=118936363&loc=SL6953423-111524 Reference 2: 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=118955202&loc=SL82895884-210446 Reference 3: 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=119407570&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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=119407570&loc=SL82919249-210447 + Details
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- Definition The effect of a change in method or methods for calculating the allowance for credit losses on the current period provision. + 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 (d) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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