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SECURITIES AVAILABLE FOR SALE (Tables) | 12 Months Ended
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Dec. 31, 2021
SECURITIES AVAILABLE FOR SALE |
Summary of Securities Available for Sale | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​
(in thousands) |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
December 31, 2021 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Mortgage-backed securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
US Government-sponsored enterprises | ​ | $ | 237,283 | ​ | $ | 2,289 | ​ | $ | (3,455) | ​ | $ | 236,117
US Government agency | ​ |  | 79,143 | ​ |  | 1,016 | ​ |  | (522) | ​ |  | 79,637
Private label | ​ |  | 68,691 | ​ |  | 142 | ​ |  | (138) | ​ |  | 68,695
Obligations of states and political subdivisions thereof | ​ |  | 140,585 | ​ |  | 1,489 | ​ |  | (298) | ​ |  | 141,776
Corporate bonds | ​ |  | 89,994 | ​ |  | 2,479 | ​ |  | (422) | ​ |  | 92,051
Total securities available for sale | ​ | $ | 615,696 | ​ | $ | 7,415 | ​ | $ | (4,835) | ​ | $ | 618,276
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​
(in thousands) |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
December 31, 2020 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Mortgage-backed securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
US Government-sponsored enterprises | ​ | $ | 206,834 | ​ | $ | 6,018 | ​ | $ | (462) | ​ | $ | 212,390
US Government agency | ​ |  | 82,878 | ​ |  | 2,870 | ​ |  | (116) | ​ |  | 85,632
Private label | ​ |  | 19,810 | ​ |  | 40 | ​ |  | (141) | ​ |  | 19,709
Obligations of states and political subdivisions thereof | ​ |  | 164,766 | ​ |  | 4,244 | ​ |  | (6) | ​ |  | 169,004
Corporate bonds | ​ |  | 97,689 | ​ |  | 1,465 | ​ |  | (843) | ​ |  | 98,311
Total securities available for sale | ​ | $ | 571,977 | ​ | $ | 14,637 | ​ | $ | (1,568) | ​ | $ | 585,046
Schedule of Amortized Cost and Estimated Fair Value of Available for Sale (AFS) Securities, Segregated by Contractual Maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Available for sale
(in thousands) |  | Amortized Cost |  | Fair Value
Within 1 year |  | $ | 4,999 | ​ | $ | 5,047
Over 1 year to 5 years | ​ |  | 24,530 | ​ |  | 25,112
Over 5 years to 10 years | ​ |  | 61,955 | ​ |  | 60,534
Over 10 years | ​ |  | 139,095 | ​ |  | 143,134
Total bonds and obligations | ​ |  | 230,579 | ​ |  | 233,827
Mortgage-backed securities | ​ |  | 385,117 | ​ |  | 384,449
Total securities available for sale | ​ | $ | 615,696 | ​ | $ | 618,276
Schedule of Gains and Losses from Sale of AFS Securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Proceeds from Sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | of Securities | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | Available for Sale |  | Realized Gains |  | Realized Losses |  | Net
2021 | ​ | $ | 92,723 | ​ | $ | 2,933 | ​ | $ | (63) | ​ | $ | 2,870
2020 | ​ | ​ | 153,200 | ​ | ​ | 5,492 | ​ | ​ | (47) | ​ | ​ | 5,445
2019 | ​ |  | 92,315 | ​ | ​ | 993 | ​ | ​ | (756) | ​ | ​ | 237
Schedule of Securities with Unrealized Losses, Segregated by the Duration of Continuous Unrealized Loss Positions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than Twelve Months | ​ | Over Twelve Months | ​ | Total
​ | ​ | Gross |  | ​ | ​ |  | Gross |  | ​ | ​ |  | Gross |  | ​ | ​
​ | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair
(in thousands) |  | Losses |  | Value |  | Losses |  | Value |  | Losses |  | Value
December 31, 2021 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Mortgage-backed securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
US Government-sponsored enterprises | ​ | $ | 1,589 | ​ | $ | 127,780 | ​ | $ | 1,866 | ​ | $ | 39,717 | ​ | $ | 3,455 | ​ | $ | 167,497
US Government agency | ​ |  | 381 | ​ |  | 32,628 | ​ |  | 141 | ​ |  | 4,548 | ​ |  | 522 | ​ |  | 37,176
Private label | ​ |  | 133 | ​ |  | 44,372 | ​ |  | 5 | ​ |  | 16 | ​ |  | 138 | ​ |  | 44,388
Obligations of states and political subdivisions thereof | ​ |  | 187 | ​ |  | 36,878 | ​ |  | 111 | ​ |  | 6,129 | ​ |  | 298 | ​ |  | 43,007
Corporate bonds | ​ |  | 94 | ​ |  | 21,358 | ​ |  | 328 | ​ |  | 11,922 | ​ |  | 422 | ​ |  | 33,280
Total securities available for sale | ​ | $ | 2,384 | ​ | $ | 263,016 | ​ | $ | 2,451 | ​ | $ | 62,332 | ​ | $ | 4,835 | ​ | $ | 325,348
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less Than Twelve Months | ​ | Over Twelve Months | ​ | Total
​ |  | Gross |  | ​ | ​ |  | Gross |  | ​ | ​ |  | Gross |  | ​ | ​
​ | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair | ​ | Unrealized | ​ | Fair
(in thousands) | ​ | Losses | ​ | Value | ​ | Losses | ​ | Value | ​ | Losses | ​ | Value
December 31, 2020 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Mortgage-backed securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
US Government-sponsored enterprises | ​ | $ | 209 | ​ | $ | 40,285 | ​ | $ | 253 | ​ | $ | 4,323 | ​ | $ | 462 | ​ | $ | 44,608
US Government agency | ​ |  | 45 | ​ |  | 6,776 | ​ |  | 71 | ​ |  | 3,297 | ​ |  | 116 | ​ |  | 10,073
Private label | ​ |  | — | ​ |  | — | ​ |  | 141 | ​ |  | 19,514 | ​ |  | 141 | ​ |  | 19,514
Obligations of states and political subdivisions thereof | ​ |  | 6 | ​ |  | 5,577 | ​ |  | — | ​ |  | — | ​ |  | 6 | ​ |  | 5,577
Corporate bonds | ​ |  | 555 | ​ |  | 21,774 | ​ |  | 288 | ​ |  | 11,712 | ​ |  | 843 | ​ |  | 33,486
Total securities available for sale | ​ | $ | 815 | ​ | $ | 74,412 | ​ | $ | 753 | ​ | $ | 38,846 | ​ | $ | 1,568 | ​ | $ | 113,258
Summary of Securities Pledged as Collateral | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021 | ​ | December 31, 2020
​ |  | Carrying |  | Estimated |  | Carrying |  | Estimated
(in thousands) | ​ | Value | ​ | Fair Value | ​ | Value | ​ | Fair Value
Securities pledged for deposits | ​ | $ | 15,326 | ​ | $ | 17,214 | ​ | $ | 83,805 | ​ | $ | 92,862
Securities pledged for repurchase agreements | ​ |  | 25,693 | ​ |  | 28,431 | ​ |  | 37,444 | ​ |  | 39,119
Securities pledged for borrowings (1) | ​ |  | 45,005 | ​ |  | 47,568 | ​ |  | 48,725 | ​ |  | 51,913
Total securities pledged | ​ | $ | 86,024 | ​ | $ | 93,213 | ​ | $ | 169,974 | ​ | $ | 183,894
(1) | The Bank pledged securities as collateral for certain borrowing arrangements with the Federal Home Loan Bank of Boston and Federal Reserve Bank of Boston.

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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- Definition Tabular disclosure of financial instruments held by the entity for its own account for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions. Description may include equity, fixed income, debt or other securities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563 + Details
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