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INCOME TAXES - Effective Income Tax Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Amount                      
Statutory tax rate                 $ 5,633 $ 8,505 $ 14,918
Increase (decrease) resulting from:                      
State taxes, net of federal benefit                 547 908 986
Tax exempt interest                 (1,375) (1,315) (2,074)
Federal tax credits                 (282) (125) (130)
Officers' life insurance                 (431) (382) (538)
Acquisition costs                 0 0 89
Stock-based compensation plans                 (20) (120) (241)
Impact of federal tax reform enactment                 0 0 3,988
Other                 137 91 (368)
Income Tax Expense (Benefit) $ 362 $ 780 $ 1,364 $ 1,703 $ 1,426 $ 2,076 $ 2,123 $ 1,937 $ 4,209 $ 7,562 $ 16,630
Rate                      
Statutory tax rate                 21.00% 21.00% 35.00%
Increase (decrease) resulting from:                      
State taxes, net of federal benefit                 2.04% 2.24% 2.31%
Tax exempt interest                 (5.13%) (3.25%) (4.87%)
Federal tax credits                 (1.05%) (0.31%) (0.30%)
Officers' life insurance                 (1.61%) (0.94%) (1.26%)
Acquisition costs                 0.00% 0.00% 0.21%
Stock-based compensation plans                 (0.07%) (0.30%) (0.57%)
Impact of federal tax reform enactment                 0.00% 0.00% 9.36%
Other                 0.51% 0.23% (0.86%)
Effective tax rate                 15.69% 18.67% 39.02%