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SECURITIES AVAILABLE FOR SALE (Tables) | 3 Months Ended
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Mar. 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
March 31, 2020 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Debt securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Mortgage-backed securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
US Government-sponsored enterprises | ​ | $ | 284,925 | ​ | $ | 11,349 | ​ | $ | (617) | ​ | $ | 295,657
US Government agency | ​ |  | 98,059 | ​ |  | 3,801 | ​ |  | (191) | ​ |  | 101,669
Private label | ​ |  | 20,209 | ​ |  | 62 | ​ |  | (1,772) | ​ |  | 18,499
Obligations of states and political subdivisions thereof | ​ |  | 134,258 | ​ |  | 3,636 | ​ |  | (315) | ​ |  | 137,579
Corporate bonds | ​ |  | 76,191 | ​ |  | 1,497 | ​ |  | (4,751) | ​ |  | 72,937
Total securities available for sale | ​ | $ | 613,642 | ​ | $ | 20,345 | ​ | $ | (7,646) | ​ | $ | 626,341
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​
(in thousands) |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
December 31, 2019 | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Debt securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
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 | ​ |  | 139,240 | ​ |  | 3,034 | ​ |  | (268) | ​ |  | 142,006
Corporate bonds | ​ |  | 78,804 | ​ |  | 1,478 | ​ |  | (221) | ​ |  | 80,061
Total securities available for sale | ​ | $ | 655,888 | ​ | $ | 11,205 | ​ | $ | (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 | ​ |  | 30,554 | ​ |  | 31,547
Over 5 years to 10 years | ​ |  | 56,401 | ​ |  | 52,656
Over 10 years | ​ |  | 123,494 | ​ |  | 126,313
Total bonds and obligations | ​ |  | 210,449 | ​ |  | 210,516
Mortgage-backed securities | ​ |  | 403,193 | ​ |  | 415,825
Total securities available for sale | ​ | $ | 613,642 | ​ | $ | 626,341
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
March 31, 2020 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Debt securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Mortgage-backed securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
US Government-sponsored enterprises | ​ | $ | 165 | ​ | $ | 9,548 | ​ | $ | 452 | ​ | $ | 6,608 | ​ | $ | 617 | ​ | $ | 16,156
US Government agency | ​ |  | 180 | ​ |  | 11,899 | ​ |  | 11 | ​ |  | 4,122 | ​ |  | 191 | ​ |  | 16,021
Private label | ​ |  | 10 | ​ |  | 124 | ​ |  | 1,762 | ​ |  | 18,234 | ​ |  | 1,772 | ​ |  | 18,358
Obligations of states and political subdivisions thereof | ​ |  | 315 | ​ |  | 17,862 | ​ |  | — | ​ |  | — | ​ |  | 315 | ​ |  | 17,862
Corporate bonds | ​ |  | 3,831 | ​ |  | 29,977 | ​ |  | 920 | ​ |  | 5,330 | ​ |  | 4,751 | ​ |  | 35,307
Total securities available for sale | ​ | $ | 4,501 | ​ | $ | 69,410 | ​ | $ | 3,145 | ​ | $ | 34,294 | ​ | $ | 7,646 | ​ | $ | 103,704
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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 |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Debt securities: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
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
Schedule of Other Than Temporary Impairment Losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​
​ | ​ | March 31, | ​
​ |  | 2020 |  | 2019 |
Estimated credit losses as of prior year-end | ​ | $ | 1,697 | ​ | $ | 1,697 | ​
Reductions for securities paid off during the period | ​ |  | — | ​ |  | — | ​
Estimated credit losses at end of the period | ​ | $ | 1,697 | ​ | $ | 1,697 | ​

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