INCOME TAXES - Schedule of Effective Income Tax Rate (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Effective Income Tax Rate Reconciliation, Amount: | |||||||||||
| Provision at expected rate | $ 5,804 | $ 5,996 | $ 6,260 | ||||||||
| (Decrease) increase in tax resulting from | |||||||||||
| Tax-exempt income | (1,092) | (1,492) | (1,673) | ||||||||
| Tax credits | (312) | (737) | (737) | ||||||||
| Other, net | 197 | (31) | (46) | ||||||||
| Total provision | $ 1,290 | $ 1,273 | $ 1,152 | $ 882 | $ 1,106 | $ 957 | $ 825 | $ 848 | $ 4,597 | $ 3,736 | $ 3,804 |
| Effective Income Tax Rate Reconciliation, Percent: | |||||||||||
| Provision at expected rate (as a percent) | 34.00% | 34.00% | 34.00% | ||||||||
| (Decrease) increase in tax resulting from: | |||||||||||
| Tax-exempt income (as a percent) | (6.40%) | (8.46%) | (9.09%) | ||||||||
| Tax credits (as a percent) | (1.83%) | (4.17%) | (4.00%) | ||||||||
| Other, net (as a percent) | 1.16% | (0.18%) | (0.25%) | ||||||||
| Effective income tax provision (benefit) and rate (as a percent) | 26.93% | 21.19% | 20.66% | ||||||||