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Finance Receivable, Allowance for Credit Loss (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 12, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  | $ 146,922 |  | $ 113,392 | $ 67,740 | $ 64,293
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  |  |  |  | (1,137) |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration |  |  |  |  | 1,157 |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  | (4,944) |  | (8,446) | (5,205) |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  | 3,729 |  | 1,578 | 2,652 |
Financing Receivable, Credit Loss, Expense (Reversal) |  |  | 18,205 |  | 52,500 | 6,000 |
Financing Receivable, Nonaccrual, No Allowance |  |  | 621 | [1] | 35,528 |  |
Finance Receivable, Nonaccrual, with allowance |  |  | 27,199 | [1] | 31,332 |  |
Financing Receivable, Nonaccrual | [1] |  | 27,820 |  | 66,860 |  |
Blue Hills Bancorp, Inc. [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  | 67,200 |  |  |  |
Financing Receivable, Credit Loss, Expense (Reversal) |  | $ 50,700 |  |  |  |  |
Commercial And Industrial [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  | 14,402 |  | 21,086 | 17,594 | 15,760
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  |  |  |  | (1,984) |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration |  |  |  |  | 49 |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  | (3,474) |  | (2,309) | (244) |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  | 2,686 |  | 289 | 1,131 |
Financing Receivable, Credit Loss, Expense (Reversal) |  |  | (6,062) |  | 7,447 | 947 |
Financing Receivable, Nonaccrual, No Allowance |  |  | 19 |  | 30,925 |  |
Finance Receivable, Nonaccrual, with allowance |  |  | 3,420 |  | 3,804 |  |
Financing Receivable, Nonaccrual | [1] |  | 3,439 |  | 34,729 |  |
Commercial Real Estate [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  | 83,486 |  | 45,009 | 32,935 | 32,370
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  |  |  |  | (13,048) |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration |  |  |  |  | 337 |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  | 0 |  | (3,885) | (2,614) |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  | 57 |  | 9 | 152 |
Financing Receivable, Credit Loss, Expense (Reversal) |  |  | 24,023 |  | 28,661 | 3,027 |
Financing Receivable, Nonaccrual, No Allowance |  |  | 0 |  | 0 |  |
Finance Receivable, Nonaccrual, with allowance |  |  | 10,870 |  | 10,195 |  |
Financing Receivable, Nonaccrual | [1] |  | 10,870 |  | 10,195 |  |
Construction Loans [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  | 12,316 |  | 5,397 | 6,053 | 5,158
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  |  |  |  | (3,652) |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration |  |  |  |  | 0 |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  | 0 |  | 0 | 0 |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  | 0 |  | 0 | 0 |
Financing Receivable, Credit Loss, Expense (Reversal) |  |  | 5,900 |  | 2,996 | 895 |
Small Business [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  | 3,508 |  | 5,095 | 1,746 | 1,756
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  |  |  |  | 495 |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration |  |  |  |  | 0 |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  | (219) |  | (380) | (509) |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  | 98 |  | 33 | 122 |
Financing Receivable, Credit Loss, Expense (Reversal) |  |  | (1,466) |  | 3,201 | 377 |
Financing Receivable, Nonaccrual, No Allowance |  |  |  |  | 10 |  |
Finance Receivable, Nonaccrual, with allowance |  |  | 44 |  | 815 |  |
Financing Receivable, Nonaccrual | [1] |  | 44 |  | 825 |  |
Residential Real Estate [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  | 14,484 |  | 14,275 | 3,440 | 3,219
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  |  |  |  | 9,828 |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration |  |  |  |  | 423 |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  | 0 |  | (105) | 0 |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  | 1 |  | 2 | 142 |
Financing Receivable, Credit Loss, Expense (Reversal) |  |  | (221) |  | 687 | 79 |
Financing Receivable, Nonaccrual, No Allowance |  |  | 602 |  | 4,593 |  |
Finance Receivable, Nonaccrual, with allowance |  |  | 8,580 |  | 10,935 |  |
Financing Receivable, Nonaccrual | [1] |  | 9,182 |  | 15,528 |  |
Home Equity Line of Credit [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  | 17,986 |  | 22,060 | 5,576 | 5,608
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  |  |  |  | 7,012 |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration |  |  |  |  | 319 |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  | (69) |  | (142) | (240) |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  | 249 |  | 210 | 318 |
Financing Receivable, Credit Loss, Expense (Reversal) |  |  | (4,417) |  | 9,085 | (110) |
Financing Receivable, Nonaccrual, No Allowance |  |  | 0 |  | 0 |  |
Finance Receivable, Nonaccrual, with allowance |  |  | 3,781 |  | 5,427 |  |
Financing Receivable, Nonaccrual | [1] |  | 3,781 |  | 5,427 |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  | 740 |  | 470 | 396 | $ 422
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method |  |  |  |  | 212 |  |
Financing Receivable, Allowance for Credit Loss, Purchased with Credit Deterioration |  |  |  |  | 29 |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  | (1,182) |  | (1,625) | (1,598) |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  | 638 |  | 1,035 | 787 |
Financing Receivable, Credit Loss, Expense (Reversal) |  |  | 448 |  | 423 | $ 785 |
Financing Receivable, Nonaccrual, No Allowance |  |  | 0 |  | 0 |  |
Finance Receivable, Nonaccrual, with allowance |  |  | 504 |  | 156 |  |
Financing Receivable, Nonaccrual | [1] |  | $ 504 |  | $ 156 |  |
[1] | Included in these amounts are $2.0 million and $22.2 million of nonaccruing TDRs at December 31, 2021 and December 31, 2020, respectively.

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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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- 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=123577603&loc=SL6953423-111524 + Details
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- Definition Amount of increase in allowance for credit loss on financing receivable from recovery. + 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=124267575&loc=SL82922352-210448 Reference 2: 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=124255953&loc=SL82919249-210447 Reference 3: 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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