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INCOME TAXES - Effective Tax Rate (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
Effective Income Tax Rate Reconciliation, Amount [Abstract]                      
Statutory tax rate                 $ 26,037 $ 29,018 $ 31,921
State taxes, net of federal tax benefit                 3,641 7,081 1,699
Tax exempt income - investments, net                 (3,527) (3,620) (5,395)
Bank-owned life insurance                 (1,305) (1,337) (1,556)
Non-deductible merger costs                 122 181 368
Tax credits, net of basis reduction                 (3,531) (3,574) (4,656)
Change in valuation allowance                 0 0 75
Impact of federal tax reform enactment                 0 0 18,721
Other, net                 1,026 1,212 911
Effective tax rate $ 6,421 $ 4,007 $ 5,118 $ 6,917 $ 4,384 $ 9,095 $ 8,145 $ 7,337 $ 22,463 $ 28,961 $ 42,088
Effective Income Tax Rate Reconciliation, Percent [Abstract]                      
Statutory tax rate                 21.00% 21.00% 35.00%
State taxes, net of federal tax benefit                 2.90% 5.10% 1.90%
Tax exempt income - investments, net                 (2.80%) (2.60%) (5.90%)
Bank-owned life insurance                 (1.10%) (1.00%) (1.70%)
Non-deductible merger costs                 0.10% 0.10% 0.40%
Tax credits, net of basis reduction                 (2.80%) (2.60%) (5.10%)
Change in valuation allowance                 0.00% 0.00% 0.10%
Impact of federal tax reform enactment                 0 0 0.205
Other, net                 0.80% 0.90% 1.00%
Effective tax rate                 18.10% 20.90% 46.20%