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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 |  |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | $ 144,518 | [1] |  |  | $ 146,922 | $ 113,392
Allowance for Loan and Lease Losses, Write-offs |  | (706) |  |  |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts |  | 302 |  |  |  |  |
Provision for Loan and Lease Losses |  | (2,000) |  |  |  |  |
Loans and Leases Receivable, Allowance |  | 144,518 |  | $ 107,549 | [1] | 146,922 |
(Release of) provision for credit losses |  | (2,000) |  | (2,500) |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts |  |  |  | 343 |  |  |
Allowance for Loan and Lease Losses, Write-offs |  |  |  | (3,686) |  |  |
Commercial And Industrial [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | 14,169 | [1] |  |  | 14,402 | 21,086
Allowance for Loan and Lease Losses, Write-offs |  | 0 |  |  |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts |  | 13 |  |  |  |  |
Provision for Loan and Lease Losses |  | (246) |  |  |  |  |
Loans and Leases Receivable, Allowance | [1] |  |  | 20,207 |  |  |
(Release of) provision for credit losses |  |  |  | 2,388 |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts |  |  |  | 64 |  |  |
Allowance for Loan and Lease Losses, Write-offs |  |  |  | (3,331) |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | 84,436 | [1] |  |  | 83,486 | 45,009
Allowance for Loan and Lease Losses, Write-offs |  | 0 |  |  |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts |  | 3 |  |  |  |  |
Provision for Loan and Lease Losses |  | 947 |  |  |  |  |
Loans and Leases Receivable, Allowance | [1] |  |  | 44,348 |  |  |
(Release of) provision for credit losses |  |  |  | (718) |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts |  |  |  | 57 |  |  |
Allowance for Loan and Lease Losses, Write-offs |  |  |  | 0 |  |  |
Construction Loans [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | 11,867 | [1] |  |  | 12,316 | 5,397
Allowance for Loan and Lease Losses, Write-offs |  | 0 |  |  |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts |  | 0 |  |  |  |  |
Provision for Loan and Lease Losses |  | (449) |  |  |  |  |
Loans and Leases Receivable, Allowance | [1] |  |  | 5,268 |  |  |
(Release of) provision for credit losses |  |  |  | (129) |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts |  |  |  | 0 |  |  |
Allowance for Loan and Lease Losses, Write-offs |  |  |  | 0 |  |  |
Small Business [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | 3,159 | [1] |  |  | 3,508 | 5,095
Allowance for Loan and Lease Losses, Write-offs |  | (48) |  |  |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts |  | 26 |  |  |  |  |
Provision for Loan and Lease Losses |  | (327) |  |  |  |  |
Loans and Leases Receivable, Allowance | [1] |  |  | 3,621 |  |  |
(Release of) provision for credit losses |  |  |  | (1,419) |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts |  |  |  | 11 |  |  |
Allowance for Loan and Lease Losses, Write-offs |  |  |  | (66) |  |  |
Residential Real Estate [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | 18,388 | [1] |  |  | 14,484 | 14,275
Allowance for Loan and Lease Losses, Write-offs |  | 0 |  |  |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts |  | 0 |  |  |  |  |
Provision for Loan and Lease Losses |  | 3,904 |  |  |  |  |
Loans and Leases Receivable, Allowance | [1] |  |  | 12,956 |  |  |
(Release of) provision for credit losses |  |  |  | (1,320) |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts |  |  |  | 1 |  |  |
Allowance for Loan and Lease Losses, Write-offs |  |  |  | 0 |  |  |
Home Equity Line of Credit [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | 11,750 | [1] |  |  | 17,986 | 22,060
Allowance for Loan and Lease Losses, Write-offs |  | (24) |  |  |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts |  | 26 |  |  |  |  |
Provision for Loan and Lease Losses |  | (6,238) |  |  |  |  |
Loans and Leases Receivable, Allowance | [1] |  |  | 20,716 |  |  |
(Release of) provision for credit losses |  |  |  | (1,357) |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts |  |  |  | 13 |  |  |
Allowance for Loan and Lease Losses, Write-offs |  |  |  | 0 |  |  |
Consumer - Other [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  | 749 | [1] |  |  | $ 740 | $ 470
Allowance for Loan and Lease Losses, Write-offs |  | (634) |  |  |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts |  | 234 |  |  |  |  |
Provision for Loan and Lease Losses |  | $ 409 |  |  |  |  |
Loans and Leases Receivable, Allowance | [1] |  |  | 433 |  |  |
(Release of) provision for credit losses |  |  |  | 55 |  |  |
Allowance for Loan and Lease Loss, Recovery of Bad Debts |  |  |  | 197 |  |  |
Allowance for Loan and Lease Losses, Write-offs |  |  |  | $ (289) |  |  |
[1] | Balances of accrued interest receivable excluded from amortized cost and the calculation of allowance for credit losses amounted to $39.4 million and $33.4 million as of March 31, 2022 and March 31, 2021, respectively.

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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + 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)(4) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + 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)(3) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + 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=123577603&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=124255206&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=124255953&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=124255953&loc=SL82919249-210447 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (3) Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (c) Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph (a) -Subparagraph (1) + Details
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