INCOME TAX- Differences between effective tax rates and the federal tax rate (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Differences between effective tax rates and the federal statutory rate applied to income before income taxes | |||
| Federal statutory income tax rate (as a percent) | 35.00% | 35.00% | 35.00% |
| Federal statutory income tax | $ 17,661 | $ 16,021 | $ 12,871 |
| Tax exempt interest | (4,799) | (4,676) | (4,425) |
| Effect of state income taxes | 75 | 169 | 3,199 |
| Non-deductible expenses | 436 | 193 | 338 |
| Tax exempt income on life insurance | (530) | (537) | (454) |
| Tax credits | (397) | (501) | (369) |
| Change in valuation allowance | (453) | (190) | (2,749) |
| Captive insurance premiums | (335) | (361) | (371) |
| Low income housing proportional amortization | 419 | 363 | |
| Other | 60 | (248) | (261) |
| Total income tax expense | $ 12,137 | $ 10,233 | $ 7,779 |