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SECURITIES AVAILABLE FOR SALE (Tables) | 12 Months Ended
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Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Summary of Securities Available for Sale | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | 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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​
(in thousands) |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
December 31, 2019 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Mortgage-backed securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
US Government-sponsored enterprises | ​ | $ | 319,064 | ​ | $ | 4,985 | ​ | $ | (2,080) | ​ | $ | 321,969
US Government agency | ​ |  | 98,568 | ​ |  | 1,640 | ​ |  | (547) | ​ |  | 99,661
Private label | ​ |  | 20,212 | ​ |  | 68 | ​ |  | (747) | ​ |  | 19,533
Obligations of states and political subdivisions thereof | ​ |  | 139,332 | ​ |  | 2,942 | ​ |  | (268) | ​ |  | 142,006
Corporate bonds | ​ |  | 78,804 | ​ |  | 1,478 | ​ |  | (221) | ​ |  | 80,061
Total securities available for sale | ​ | $ | 655,980 | ​ | $ | 11,113 | ​ | $ | (3,863) | ​ | $ | 663,230
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 |  | $ | — | ​ | $ | —
Over 1 year to 5 years | ​ |  | 20,566 | ​ |  | 20,963
Over 5 years to 10 years | ​ |  | 76,456 | ​ |  | 76,598
Over 10 years | ​ |  | 165,433 | ​ |  | 169,752
Total bonds and obligations | ​ |  | 262,455 | ​ |  | 267,313
Mortgage-backed securities | ​ |  | 309,522 | ​ |  | 317,733
Total securities available for sale | ​ | $ | 571,977 | ​ | $ | 585,046
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
2020 | ​ | $ | 153,200 | ​ | $ | 5,492 | ​ | $ | (47) | ​ | $ | 5,445
2019 | ​ | ​ | 92,315 | ​ | ​ | 993 | ​ | ​ | (756) | ​ | ​ | 237
2018 | ​ |  | 29,107 | ​ | ​ | — | ​ | ​ | (924) |  | ​ | (924)
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, 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
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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, 2019 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Mortgage-backed securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
US Government-sponsored enterprises | ​ | $ | 1,074 | ​ | $ | 43,429 | ​ | $ | 1,006 | ​ | $ | 49,712 | ​ | $ | 2,080 | ​ | $ | 93,141
US Government agency | ​ |  | 432 | ​ |  | 19,717 | ​ |  | 115 | ​ |  | 9,120 | ​ |  | 547 | ​ |  | 28,837
Private label | ​ |  | 380 | ​ |  | 9,843 | ​ |  | 367 | ​ |  | 9,411 | ​ |  | 747 | ​ |  | 19,254
Obligations of states and political subdivisions thereof | ​ |  | 137 | ​ |  | 29,355 | ​ |  | 131 | ​ |  | 1,682 | ​ |  | 268 | ​ |  | 31,037
Corporate bonds | ​ |  | 142 | ​ |  | 9,888 | ​ |  | 79 | ​ |  | 12,276 | ​ |  | 221 | ​ |  | 22,164
Total securities available for sale | ​ | $ | 2,165 | ​ | $ | 112,232 | ​ | $ | 1,698 | ​ | $ | 82,201 | ​ | $ | 3,863 | ​ | $ | 194,433
Summary of Securities Pledged as Collateral | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020 | ​ | December 31, 2019
​ |  | Carrying |  | Estimated |  | Carrying |  | Estimated
(in thousands) | ​ | Value | ​ | Fair Value | ​ | Value | ​ | Fair Value
Securities pledged for deposits | ​ | $ | 83,805 | ​ | $ | 92,862 | ​ | $ | 217,009 | ​ | $ | 220,054
Securities pledged for repurchase agreements | ​ |  | 37,444 | ​ |  | 39,119 | ​ |  | 96,007 | ​ |  | 96,477
Securities pledged for borrowings (1) | ​ |  | 48,725 | ​ |  | 51,913 | ​ |  | 157,172 | ​ |  | 157,458
Total securities pledged | ​ | $ | 169,974 | ​ | $ | 183,894 | ​ | $ | 470,188 | ​ | $ | 473,989
(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.
Schedule of Other Than Temporary Impairment Losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Twelve Months Ended December 31,
(in thousands) |  | 2020 |  | 2019 |  | 2018
Estimated credit losses as of prior year-end | ​ | $ | 1,697 | ​ | $ | 1,697 | ​ | $ | 1,697
Reductions for securities paid off during the period | ​ |  | — | ​ |  | — | ​ |  | —
Estimated credit losses at end of the period | ​ | $ | 1,697 | ​ | $ | 1,697 | ​ | $ | 1,697

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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 the amount of other than temporary impairment (OTTI) related to credit losses recognized in earnings including: (a) the beginning balance of the amount related to credit losses on debt securities held by the investor at the beginning of the period for which a portion of an OTTI was recognized in other comprehensive income; (b) additions for the amount related to the credit loss for which an OTTI was not previously recognized; (c) reductions for securities sold during the period (realized); (d) reductions for securities for which the amount previously recognized in other comprehensive income was recognized in earnings because the investor intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis; (e) additional increases to the amount related to the credit loss for which an OTTI was previously recognized when the investor does not intend to sell the security and it is not more likely than not that the investor will be required to sell the security before recovery of its amortized cost basis; (f) reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security; and (g) the ending balance of the amount related to credit losses on debt securities held by the entity at the end of the period for which a portion of an OTTI was recognized in other comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27340-111563 + 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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