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Loans and Allowance for Credit Losses on Loans (Tables) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Receivables [Abstract] |  |
Composition of Loan Portfolio, Excluding Residential Loans Held for Sale | The composition of the Company’s loan portfolio, excluding residential loans held for sale, was as follows for the dates indicated:
|  | December 31,
(In thousands) |  | 2020 |  | 2019
Commercial Loans: |  |  |  |
Commercial real estate(1) |  | $ | 1,369,470 |  |  | $ | 1,243,397 |
Commercial |  | 381,494 |  |  | 442,701 |
SBA PPP |  | 135,095 |  |  | — |
Total commercial loans |  | 1,886,059 |  |  | 1,686,098 |
Retail Loans: |  |  |  |
Residential real estate |  | 1,054,798 |  |  | 1,070,374 |
Home equity |  | 258,573 |  |  | 312,779 |
Consumer |  | 20,392 |  |  | 25,772 |
Total retail loans |  | 1,333,763 |  |  | 1,408,925 |
Total loans |  | $ | 3,219,822 |  |  | $ | 3,095,023 |
(1) Commercial real estate was segmented into non owner-occupied properties and owner-occupied properties upon adoption of CECL, effective January 1, 2020. At December 31, 2020, total commercial real estate - non owner-occupied loans and owner-occupied loans were $1.1 billion and $271.5 million, respectively. |
Schedule of Loan Balances for Each Portfolio Segment | The loan balances for each portfolio segment presented above are net of their respective net unamortized fair value mark discount on acquired loans and net unamortized loan origination costs for the dates indicated:
|  | December 31,
(In thousands) |  | 2020 |  | 2019
Net unamortized fair value mark discount on acquired loans |  | $ | (1,291) |  |  | $ | (2,593) |
Net unamortized loan origination costs(1) |  | 856 |  |  | 3,111 |
Total |  | $ | (435) |  |  | $ | 518 |
(1) The decrease in net unamortized loan origination costs from December 31, 2019 to December 31, 2020, was primarily driven by origination fees capitalized for SBA PPP loans during 2020. As of December 31, 2020, unamortized loan fees on originated SBA PPP loans were $2.2 million. |
Activity in Allowance for Loan Losses by Portfolio Segment | The following table presents the activity in the ACL on loans at and for the year ended December 31, 2020:
|  | Commercial Real Estate |  |  |  |  |  |  |  |  |  |  |  |
(In thousands) |  | Non Owner-Occupied |  | Owner- Occupied |  | Commercial |  | SBA PPP |  | Residential Real Estate |  | Home Equity |  | Consumer |  | Total
Beginning balance, December 31, 2019 |  | $ | 10,924 |  |  | $ | 1,490 |  |  | $ | 3,985 |  |  | $ | — |  |  | $ | 5,842 |  |  | $ | 2,423 |  |  | $ | 507 |  |  | $ | 25,171 |
Impact of adopting CECL(1) |  | (668) |  |  | (90) |  |  | 1,548 |  |  | — |  |  | (1,129) |  |  | 792 |  |  | (220) |  |  | 233 |
Loans charged off |  | (82) |  |  | (21) |  |  | (1,130) |  |  | — |  |  | (121) |  |  | (317) |  |  | (167) |  |  | (1,838) |
Recoveries |  | 107 |  |  | 13 |  |  | 572 |  |  | — |  |  | 292 |  |  | 33 |  |  | 67 |  |  | 1,084 |
Provision (credit) for loan losses |  | 11,497 |  |  | 1,440 |  |  | 1,728 |  |  | 69 |  |  | (1,410) |  |  | (315) |  |  | 206 |  |  | 13,215 |
Ending balance, December 31, 2020 |  | $ | 21,778 |  |  | $ | 2,832 |  |  | $ | 6,703 |  |  | $ | 69 |  |  | $ | 3,474 |  |  | $ | 2,616 |  |  | $ | 393 |  |  | $ | 37,865 |
(1) Effective January 1, 2020, the Company adopted ASU 2016-13, commonly referred to as "CECL." Refer to Note 1 for further details. | The following table presents activity in the allowance for loan losses and select loan information by portfolio segment, under the incurred loss methodology, for the periods indicated:
(In thousands) |  | Commercial Real Estate |  | Commercial |  |  |  | Residential Real Estate |  | Home Equity |  | Consumer |  | Total
At or For the Year Ended December 31, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 11,654 |  |  | $ | 3,957 |  |  |  |  | $ | 6,071 |  |  | $ | 2,796 |  |  | $ | 234 |  |  | $ | 24,712 |
Loans charged off |  | (300) |  |  | (1,238) |  |  |  |  | (462) |  |  | (412) |  |  | (301) |  |  | (2,713) |
Recoveries |  | 49 |  |  | 225 |  |  |  |  | 16 |  |  | 1 |  |  | 19 |  |  | 310 |
Provision (credit) for loan losses |  | 1,011 |  |  | 1,041 |  |  |  |  | 217 |  |  | 38 |  |  | 555 |  |  | 2,862 |
Ending balance |  | $ | 12,414 |  |  | $ | 3,985 |  |  |  |  | $ | 5,842 |  |  | $ | 2,423 |  |  | $ | 507 |  |  | $ | 25,171 |
Allowance balance attributable loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  | $ | 30 |  |  | $ | — |  |  |  |  | $ | 364 |  |  | $ | 69 |  |  | $ | — |  |  | $ | 463 |
Collectively evaluated for impairment |  | 12,384 |  |  | 3,985 |  |  |  |  | 5,478 |  |  | 2,354 |  |  | 507 |  |  | 24,708 |
Total ending allowance |  | $ | 12,414 |  |  | $ | 3,985 |  |  |  |  | $ | 5,842 |  |  | $ | 2,423 |  |  | $ | 507 |  |  | $ | 25,171 |
Loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  | $ | 402 |  |  | $ | 319 |  |  |  |  | $ | 3,384 |  |  | $ | 373 |  |  | $ | — |  |  | $ | 4,478 |
Collectively evaluated for impairment |  | 1,242,995 |  |  | 442,382 |  |  |  |  | 1,066,990 |  |  | 312,406 |  |  | 25,772 |  |  | 3,090,545 |
Total loan balances |  | $ | 1,243,397 |  |  | $ | 442,701 |  |  |  |  | $ | 1,070,374 |  |  | $ | 312,779 |  |  | $ | 25,772 |  |  | $ | 3,095,023 |
At or For the Year Ended December 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 11,863 |  |  | $ | 4,622 |  |  |  |  | $ | 5,086 |  |  | $ | 2,367 |  |  | $ | 233 |  |  | $ | 24,171 |
Loans charged off |  | (512) |  |  | (991) |  |  |  |  | (173) |  |  | (476) |  |  | (96) |  |  | (2,248) |
Recoveries |  | 28 |  |  | 1,771 |  |  |  |  | 90 |  |  | 44 |  |  | 11 |  |  | 1,944 |
Provision (credit) for loan losses |  | 275 |  |  | (1,445) |  |  |  |  | 1,068 |  |  | 861 |  |  | 86 |  |  | 845 |
Ending balance |  | $ | 11,654 |  |  | $ | 3,957 |  |  |  |  | $ | 6,071 |  |  | $ | 2,796 |  |  | $ | 234 |  |  | $ | 24,712 |
Allowance balance attributable loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  | $ | 23 |  |  | $ | 53 |  |  |  |  | $ | 586 |  |  | $ | 162 |  |  | $ | — |  |  | $ | 824 |
Collectively evaluated for impairment |  | 11,631 |  |  | 3,904 |  |  |  |  | 5,485 |  |  | 2,634 |  |  | 234 |  |  | 23,888 |
Total ending allowance |  | $ | 11,654 |  |  | $ | 3,957 |  |  |  |  | $ | 6,071 |  |  | $ | 2,796 |  |  | $ | 234 |  |  | $ | 24,712 |
Loans: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Individually evaluated for impairment |  | $ | 930 |  |  | $ | 786 |  |  |  |  | $ | 4,762 |  |  | $ | 442 |  |  | $ | 6 |  |  | $ | 6,926 |
Collectively evaluated for impairment |  | 1,268,603 |  |  | 414,650 |  |  |  |  | 988,104 |  |  | 327,321 |  |  | 20,618 |  |  | 3,019,296 |
Total loan balances |  | $ | 1,269,533 |  |  | $ | 415,436 |  |  |  |  | $ | 992,866 |  |  | $ | 327,763 |  |  | $ | 20,624 |  |  | $ | 3,026,222 |
Credit Risk Exposure Indicators by Portfolio Segment | Based on the most recent analysis performed, the risk category of loans by portfolio segment by vintage, reported under the CECL methodology, was as follows as of the period indicated:
(In thousands) |  | 2020 |  | 2019 |  | 2018 |  | 2017 |  | 2016 |  | Prior |  | Revolving Loans Amortized Cost Basis |  | Revolving Loans Converted to Term |  | Total
As of December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial real estate - non owner-occupied |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk rating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass (Grades 1-6) |  | $ | 138,010 |  |  | $ | 224,148 |  |  | $ | 144,552 |  |  | $ | 119,409 |  |  | $ | 157,588 |  |  | $ | 264,253 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,047,960 |
Special mention (Grade 7) |  | 5,739 |  |  | — |  |  | — |  |  | 4,256 |  |  | 3,497 |  |  | 847 |  |  | — |  |  | — |  |  | 14,339 |
Substandard (Grade 8) |  | 24 |  |  | 125 |  |  | 2,070 |  |  | 405 |  |  | 1,522 |  |  | 31,530 |  |  | — |  |  | — |  |  | 35,676 |
Doubtful (Grade 9) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total commercial real estate - non owner-occupied |  | 143,773 |  |  | 224,273 |  |  | 146,622 |  |  | 124,070 |  |  | 162,607 |  |  | 296,630 |  |  | — |  |  | — |  |  | 1,097,975 |
Commercial real estate - owner-occupied |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk rating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass (Grades 1-6) |  | 35,948 |  |  | 29,217 |  |  | 48,312 |  |  | 47,065 |  |  | 25,507 |  |  | 76,098 |  |  | — |  |  | — |  |  | 262,147 |
Special mention (Grade 7) |  | — |  |  | — |  |  | 4,584 |  |  | — |  |  | — |  |  | 1,513 |  |  | — |  |  | — |  |  | 6,097 |
Substandard (Grade 8) |  | — |  |  | — |  |  | 891 |  |  | 462 |  |  | — |  |  | 1,898 |  |  | — |  |  | — |  |  | 3,251 |
Doubtful (Grade 9) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total commercial real estate - owner occupied |  | 35,948 |  |  | 29,217 |  |  | 53,787 |  |  | 47,527 |  |  | 25,507 |  |  | 79,509 |  |  | — |  |  | — |  |  | 271,495 |
Commercial |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk rating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass (Grades 1-6) |  | 53,966 |  |  | 72,863 |  |  | 40,688 |  |  | 25,478 |  |  | 15,788 |  |  | 51,869 |  |  | 72,425 |  |  | 37,026 |  |  | 370,103 |
Special mention (Grade 7) |  | — |  |  | 22 |  |  | 313 |  |  | 4,924 |  |  | 117 |  |  | 400 |  |  | — |  |  | 867 |  |  | 6,643 |
Substandard (Grade 8) |  | 187 |  |  | 1,012 |  |  | 211 |  |  | 51 |  |  | 42 |  |  | 2,081 |  |  | 65 |  |  | 1,099 |  |  | 4,748 |
Doubtful (Grade 9) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total commercial |  | 54,153 |  |  | 73,897 |  |  | 41,212 |  |  | 30,453 |  |  | 15,947 |  |  | 54,350 |  |  | 72,490 |  |  | 38,992 |  |  | 381,494 |
SBA PPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk rating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass (Grades 1-6) |  | 135,095 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 135,095 |
Special mention (Grade 7) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Substandard (Grade 8) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Doubtful (Grade 9) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total SBA PPP |  | 135,095 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 135,095 |
Residential Real Estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk rating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass (Grades 1-6) |  | 339,834 |  |  | 183,877 |  |  | 119,426 |  |  | 79,159 |  |  | 57,269 |  |  | 266,324 |  |  | 3,028 |  |  | — |  |  | 1,048,917 |
Special mention (Grade 7) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 398 |  |  | — |  |  | — |  |  | 398 |
Substandard (Grade 8) |  | — |  |  | — |  |  | 176 |  |  | 487 |  |  | — |  |  | 4,820 |  |  | — |  |  | — |  |  | 5,483 |
Doubtful (Grade 9) |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Total residential real estate |  | 339,834 |  |  | 183,877 |  |  | 119,602 |  |  | 79,646 |  |  | 57,269 |  |  | 271,542 |  |  | 3,028 |  |  | — |  |  | 1,054,798 |
Home equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk rating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performing |  | 855 |  |  | 9,415 |  |  | 17,281 |  |  | 3,478 |  |  | 1,339 |  |  | 17,664 |  |  | 194,065 |  |  | 12,480 |  |  | 256,577 |
Non-performing |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 207 |  |  | 1,241 |  |  | 548 |  |  | 1,996 |
Total home equity |  | 855 |  |  | 9,415 |  |  | 17,281 |  |  | 3,478 |  |  | 1,339 |  |  | 17,871 |  |  | 195,306 |  |  | 13,028 |  |  | 258,573 |
Consumer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Risk rating |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performing |  | 6,572 |  |  | 6,525 |  |  | 3,096 |  |  | 1,359 |  |  | 378 |  |  | 1,780 |  |  | 678 |  |  | — |  |  | 20,388 |
Non-performing |  | — |  |  | — |  |  | — |  |  | — |  |  | 4 |  |  | — |  |  | — |  |  | — |  |  | 4 |
Total consumer |  | 6,572 |  |  | 6,525 |  |  | 3,096 |  |  | 1,359 |  |  | 382 |  |  | 1,780 |  |  | 678 |  |  | — |  |  | 20,392 |
Total Loans |  | $ | 716,230 |  |  | $ | 527,204 |  |  | $ | 381,600 |  |  | $ | 286,533 |  |  | $ | 263,051 |  |  | $ | 721,682 |  |  | $ | 271,502 |  |  | $ | 52,020 |  |  | $ | 3,219,822 |
| The following table summarizes credit risk exposure indicators by portfolio segment, under the incurred loss methodology, as of the date indicated:
(In thousands) |  | Commercial Real Estate |  | Commercial |  |  |  | Residential Real Estate |  | Home Equity |  | Consumer |  | Total
December 31, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pass (Grades 1 – 6) |  | $ | 1,196,683 |  |  | $ | 436,537 |  |  |  |  | $ | 1,062,825 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,696,045 |
Performing |  | — |  |  | — |  |  |  |  | — |  |  | 310,653 |  |  | 25,748 |  |  | 336,401 |
Special Mention (Grade 7) |  | 31,753 |  |  | 2,633 |  |  |  |  | 473 |  |  | — |  |  | — |  |  | 34,859 |
Substandard (Grade 8) |  | 14,961 |  |  | 3,531 |  |  |  |  | 7,076 |  |  | — |  |  | — |  |  | 25,568 |
Non-performing |  | — |  |  | — |  |  |  |  | — |  |  | 2,126 |  |  | 24 |  |  | 2,150 |
Total |  | $ | 1,243,397 |  |  | $ | 442,701 |  |  |  |  | $ | 1,070,374 |  |  | $ | 312,779 |  |  | $ | 25,772 |  |  | $ | 3,095,023 |
Loan Aging Analysis by Portfolio Segment (Including Loans Past Due Over Ninety Days and Non Accrual Loans) and Summary of Non Accrual Loans, Which Include Troubled Debt Restructured Loans, and Loans Past Due Over Ninety Days and Accruing | The following is a loan aging analysis by portfolio segment (including loans past due over 90 days and non-accrual loans) and loans past due over 90 days and accruing as of the following dates:
(In thousands) |  | 30 – 59 Days Past Due |  | 60 – 89 Days Past Due |  | 90 Days or Greater Past Due |  | Total Past Due |  | Current |  | Total Loans Outstanding |  | Loans > 90 Days Past Due and Accruing |  |
December 31, 2020: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial real estate - non owner-occupied |  | $ | — |  |  | $ | 50 |  |  | $ | 173 |  |  | $ | 223 |  |  | $ | 1,097,752 |  |  | $ | 1,097,975 |  |  | $ | — |  |  |
Commercial real estate - owner-occupied |  | 99 |  |  | — |  |  | 47 |  |  | 146 |  |  | 271,349 |  |  | 271,495 |  |  | — |  |  |
Commercial |  | 430 |  |  | — |  |  | 857 |  |  | 1,287 |  |  | 380,207 |  |  | 381,494 |  |  | — |  |  |
SBA PPP |  | — |  |  | — |  |  | — |  |  | — |  |  | 135,095 |  |  | 135,095 |  |  | — |  |  |
Residential real estate |  | 1,406 |  |  | 1,103 |  |  | 2,535 |  |  | 5,044 |  |  | 1,049,754 |  |  | 1,054,798 |  |  | — |  |  |
Home equity |  | 335 |  |  | 173 |  |  | 1,416 |  |  | 1,924 |  |  | 256,649 |  |  | 258,573 |  |  | — |  |  |
Consumer |  | 92 |  |  | 67 |  |  | 4 |  |  | 163 |  |  | 20,229 |  |  | 20,392 |  |  | — |  |  |
Total |  | $ | 2,362 |  |  | $ | 1,393 |  |  | $ | 5,032 |  |  | $ | 8,787 |  |  | $ | 3,211,035 |  |  | $ | 3,219,822 |  |  | $ | — |  |  |
December 31, 2019: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial real estate |  | $ | 267 |  |  | $ | 1,720 |  |  | $ | 544 |  |  | $ | 2,531 |  |  | $ | 1,240,866 |  |  | $ | 1,243,397 |  |  | $ | — |  |  |
Commercial |  | 548 |  |  | 243 |  |  | 705 |  |  | 1,496 |  |  | 441,205 |  |  | 442,701 |  |  | — |  |  |
Residential real estate |  | 2,297 |  |  | 627 |  |  | 2,598 |  |  | 5,522 |  |  | 1,064,852 |  |  | 1,070,374 |  |  | — |  |  |
Home equity |  | 681 |  |  | 238 |  |  | 1,459 |  |  | 2,378 |  |  | 310,401 |  |  | 312,779 |  |  | — |  |  |
Consumer |  | 108 |  |  | 31 |  |  | 23 |  |  | 162 |  |  | 25,610 |  |  | 25,772 |  |  | — |  |  |
Total |  | $ | 3,901 |  |  | $ | 2,859 |  |  | $ | 5,329 |  |  | $ | 12,089 |  |  | $ | 3,082,934 |  |  | $ | 3,095,023 |  |  | $ | — |  |  |
Financing Receivable, Nonaccrual [Table Text Block] | The following table presents the amortized cost basis of loans on non-accrual status (including non-accruing TDRs) by portfolio segment as of the dates indicated:
|  | December 31,
|  | 2020 |  | 2019
(In thousands) |  | Non-Accrual Loans With an Allowance |  | Non-Accrual Loans Without an Allowance |  | Total Non-Accrual Loans |  | Total Non-Accrual Loans
Commercial real estate(1) |  | $ | 450 |  |  | $ | 62 |  |  | $ | 512 |  |  | $ | — |
Commercial |  | 1,549 |  |  | 58 |  |  | 1,607 |  |  | 784 |
Residential real estate |  | 3,136 |  |  | 341 |  |  | 3,477 |  |  | 4,096 |
Home equity |  | 1,961 |  |  | 35 |  |  | 1,996 |  |  | 2,130 |
Consumer |  | 4 |  |  | — |  |  | 4 |  |  | 24 |
Total |  | $ | 7,100 |  |  | $ | 496 |  |  | $ | 7,596 |  |  | $ | 7,034 |
(1) Commercial real estate was segmented into non owner-occupied and owner-occupied upon adoption of CECL, effective January 1, 2020. At December 31, 2020, commercial real estate - non owner-occupied and owner-occupied non-accrual balances with an allowance were $351,000 and $99,000, respectively, and commercial real estate - non owner-occupied and owner-occupied non-accrual balances without an allowance were $15,000 and $47,000, respectively. The following table presents the amortized cost basis of collateral-dependent non-accrual loans (including non-accruing TDRs) by portfolio segment and collateral type, as of the date indicated:
|  | December 31, 2020
|  | Collateral Type |  | Total Collateral -Dependent Non-Accrual Loans
(In thousands) |  | Real Estate |  | General Business Assets |
Commercial |  | $ | — |  |  | $ | 689 |  |  | $ | 689 |
Residential real estate |  | 248 |  |  | — |  |  | 248 |
Total |  | $ | 248 |  |  | $ | 689 |  |  | $ | 937 |
Troubled Debt Restructuring and Specific Reserve Related to TDRs | The following is a summary of TDRs, by portfolio segment, and the associated specific reserve included within the ACL for the dates indicated:
|  | Number of Contracts |  | Recorded Investment |  | Specific Reserve
(In thousands, except number of contracts) |  | December 31, |  | December 31, |  | December 31,
| 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
Commercial real estate(1) |  | 2 |  |  | 2 |  |  | $ | 328 |  |  | $ | 338 |  |  | $ | 37 |  |  | $ | 30 |
Commercial |  | 2 |  |  | 2 |  |  | 100 |  |  | 123 |  |  | — |  |  | — |
Residential real estate |  | 21 |  |  | 22 |  |  | 2,638 |  |  | 2,869 |  |  | 364 |  |  | 364 |
Consumer and home equity |  | — |  |  | 1 |  |  | — |  |  | 299 |  |  | — |  |  | 69 |
Total |  | 25 |  |  | 27 |  |  | $ | 3,066 |  |  | $ | 3,629 |  |  | $ | 401 |  |  | $ | 463 |
(1) Commercial real estate was segmented into non owner-occupied and owner-occupied upon adoption of CECL, effective January 1, 2020. At December 31, 2020, all commercial real estate TDRs were classified as owner-occupied. |
Summary of All Troubled Debt Restructuring Loans (Accruing and Non Accruing) by Portfolio Segment | The following represents loan modifications that qualify as TDRs that occurred during the periods indicated:
|  | Number of Contracts |  | Pre-Modification Outstanding Recorded Investment |  | Post-Modification Outstanding Recorded Investment |  | Specific Reserve
(In thousands, except number of contracts) |  | For the Year Ended December 31, |  | For the Year Ended December 31, |  | For the Year Ended December 31, |  | For the Year Ended December 31,
| 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018 |  | 2020 |  | 2019 |  | 2018
Residential real estate: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate and maturity concession |  | — |  |  | 2 |  |  | 2 |  |  | $ | — |  |  | $ | 64 |  |  | $ | 231 |  |  | $ | — |  |  | $ | 69 |  |  | $ | 254 |  |  | $ | — |  |  | $ | 15 |  |  | $ | 50 |
Payment deferral |  | — |  |  | — |  |  | 1 |  |  | — |  |  | — |  |  | 166 |  |  | — |  |  | — |  |  | 166 |  |  | — |  |  | — |  |  | 45 |
Total |  | — |  |  | 2 |  |  | 3 |  |  | $ | — |  |  | $ | 64 |  |  | $ | 397 |  |  | $ | — |  |  | $ | 69 |  |  | $ | 420 |  |  | $ | — |  |  | $ | 15 |  |  | $ | 95 |
Summary of Impaired Loan Balances and Associated Allowance by Portfolio Segment | The following is a summary of impaired loan balances and the associated allowance by portfolio segment as of and for the periods indicated:
|  |  |  |  |  |  |  | For the Year Ended
(In thousands) |  | Recorded Investment |  | Unpaid Principal Balance |  | Related Allowance |  | Average Recorded Investment |  | Interest Income Recognized
December 31, 2019: |  |  |  |  |  |  |  |  |  |
With related allowance recorded: |  |  |  |  |  |  |  |  |  |
Commercial real estate |  | $ | 128 |  |  | $ | 128 |  |  | $ | 30 |  |  | $ | 130 |  |  | $ | 11 |
Commercial |  | — |  |  | — |  |  | — |  |  | 292 |  |  | — |
Residential real estate |  | 2,395 |  |  | 2,395 |  |  | 364 |  |  | 2,989 |  |  | 110 |
Home equity |  | 318 |  |  | 318 |  |  | 69 |  |  | 522 |  |  | — |
Consumer |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Ending balance |  | 2,841 |  |  | 2,841 |  |  | 463 |  |  | 3,933 |  |  | 121 |
Without related allowance recorded: |  |  |  |  |  |  |  |  |  |
Commercial real estate |  | 274 |  |  | 433 |  |  | — |  |  | 381 |  |  | 13 |
Commercial |  | 319 |  |  | 685 |  |  | — |  |  | 238 |  |  | 7 |
Residential real estate |  | 989 |  |  | 1,116 |  |  | — |  |  | 1,258 |  |  | 21 |
Home equity |  | 55 |  |  | 192 |  |  | — |  |  | 115 |  |  | — |
Consumer |  | — |  |  | — |  |  | — |  |  | 1 |  |  | — |
Ending balance |  | 1,637 |  |  | 2,426 |  |  | — |  |  | 1,993 |  |  | 41 |
Total impaired loans |  | $ | 4,478 |  |  | $ | 5,267 |  |  | $ | 463 |  |  | $ | 5,926 |  |  | $ | 162 |
December 31, 2018: |  |  |  |  |  |  |  |  |  |
With related allowance recorded: |  |  |  |  |  |  |  |  |  |
Commercial real estate |  | $ | 131 |  |  | $ | 131 |  |  | $ | 23 |  |  | $ | 1,969 |  |  | $ | 11 |
Commercial |  | 556 |  |  | 556 |  |  | 53 |  |  | 111 |  |  | — |
Residential real estate |  | 3,471 |  |  | 3,471 |  |  | 586 |  |  | 3,591 |  |  | 127 |
Home equity |  | 318 |  |  | 318 |  |  | 162 |  |  | 250 |  |  | — |
Consumer |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Ending balance |  | 4,476 |  |  | 4,476 |  |  | 824 |  |  | 5,921 |  |  | 138 |
Without related allowance recorded: |  |  |  |  |  |  |  |  |  |
Commercial real estate |  | 799 |  |  | 975 |  |  | — |  |  | 2,269 |  |  | 13 |
Commercial |  | 230 |  |  | 293 |  |  | — |  |  | 1,379 |  |  | 8 |
Residential real estate |  | 1,291 |  |  | 1,415 |  |  | — |  |  | 1,524 |  |  | 34 |
Home equity |  | 124 |  |  | 305 |  |  | — |  |  | 195 |  |  | — |
Consumer |  | 6 |  |  | 13 |  |  | — |  |  | 1 |  |  | — |
Ending balance |  | 2,450 |  |  | 3,001 |  |  | — |  |  | 5,368 |  |  | 55 |
Total impaired loans |  | $ | 6,926 |  |  | $ | 7,477 |  |  | $ | 824 |  |  | $ | 11,289 |  |  | $ | 193 |
Temporary Loan Modifications | The Company's loans impacted by the COVID-19 pandemic and operating under temporary short-term payment deferral arrangements for a period of 180 days or less were as follows for the date indicated:
|  | December 31, 2020
(In thousands, except number of units) |  | Units |  | Amortized Cost |  | % of Total Loans
Commercial |  | 25 |  |  | $ | 19,866 |  |  | 0.6 | %
Retail |  | 28 |  |  | 6,669 |  |  | 0.2 | %
Total |  | 53 |  |  | $ | 26,535 |  |  | 0.8 | %

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