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INCOME TAXES - Income Tax Expense 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 expense                 $ 18,433 $ 17,703 $ 24,652
Increase (decrease) in taxes from:                      
Tax rate changes                 0 (767) 2,416
Tax exempt interest                 (4,875) (6,257) (10,195)
Bank owned life insurance                 (484) (613) (885)
Share-based compensation                 (167) (191) (482)
Acquisition costs                 0 0 467
State business tax                 217 297 68
Other, net                 97 (9) 80
Income tax expense $ 2,854 $ 3,661 $ 3,569 $ 3,137 $ 2,521 $ 2,192 $ 3,360 $ 2,090 $ 13,221 $ 10,163 $ 16,121
Percent of Pre-Tax Income                      
Statutory tax expense                 21.00% 21.00% 35.00%
Increase (Decrease) in Taxes From:                      
Percent of Pre-tax income, Tax rate changes                 0.00% (0.90%) 3.40%
Percent of Pre-tax income, Tax exempt interest                 (5.50%) (7.40%) (14.50%)
Percent of Pre-tax income, Bank owned life insurance                 (0.50%) (0.70%) (1.20%)
Percent of Pre-tax income, Share-based compensation                 (0.20%) (0.20%) (0.70%)
Percent of Pre-tax income, Acquisition costs                 0.00% 0.00% 0.70%
Percent of Pre-tax income, State business tax                 0.20% 0.30% 0.10%
Percent of Pre-tax income, Other net                 0.10% 0.00% 0.10%
Percent of Pre-tax income, Income tax expense                 15.10% 12.10% 22.90%