Annual report pursuant to Section 13 and 15(d)

OTHER COMPREHENSIVE INCOME (LOSS) - Accumulated other comprehensive loss (Details)

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OTHER COMPREHENSIVE INCOME (LOSS) - Accumulated other comprehensive loss (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Activity in accumulated other comprehensive loss, net of tax      
Balance, Begining $ (28,815) $ (32,044) $ (26,225)
Other comprehensive loss during the period 634 3,229 (238)
Balance, Ending (28,181) (28,815) (32,044)
Securities Available for Sale [Member]      
Activity in accumulated other comprehensive loss, net of tax      
Balance, Begining (2,008) (1,743) (583)
Other comprehensive loss during the period 2,872 (265) (851)
Adoption of Accounting Standards Update 2018-02     (309)
Balance, Ending 864 (2,008) (1,743)
Retirement plan [member]      
Activity in accumulated other comprehensive loss, net of tax      
Balance, Begining (26,807) (30,301) (25,642)
Other comprehensive loss during the period (2,238) 3,494 613
Adoption of Accounting Standards Update 2018-02     (5,272)
Balance, Ending (29,045) (26,807) (30,301)
Accumulated Other Comprehensive Loss      
Activity in accumulated other comprehensive loss, net of tax      
Balance, Begining (28,815) (32,044) (26,225)
Other comprehensive loss during the period 634 3,229 (238)
Adoption of Accounting Standards Update 2018-02     (5,581)
Balance, Ending $ (28,181) $ (28,815) $ (32,044)