| (dollars in thousands) | 2017 | | 2016 | | 2015 |
| Current federal | $27,064 | | $23,749 | | $19,992 |
| Deferred federal | (199) | | 268 | | 1,378 |
| Revalue deferred taxes due to tax reform | 4,137 | | 0 | | 0 |
| Current state | 1,559 | | 1,086 | | 1,257 |
| Deferred state | (257) | | 30 | | 206 |
| Total income tax expense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | $32,304 | | $25,133 | | $22,833 |
| (dollars in thousands) | 2017 | | 2016 | | 2015 |
| Income taxes at statutory federal rate of 35% | $31,372 | | $27,026 | | $24,220 |
| Increase (decrease) in taxes resulting from: | | | | | |
| Tax exempt income | (2,015) | | (1,498) | | (1,323) |
| Nondeductible expense | 193 | | 190 | | 206 |
| State income tax, net of federal tax effect | 846 | | 726 | | 951 |
| Captive insurance premium income | (378) | | (361) | | (363) |
| Tax credits | (326) | | (311) | | (241) |
| Bank owned life insurance | (619) | | (554) | | (605) |
| Long - term incentive plan | (854) | | 0 | | 0 |
| Revaluation deferred tax asset at 21% rate | 4,137 | | 0 | | 0 |
| Other | (52) | | (85) | | (12) |
| Total income tax expense . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | $32,304 | | $25,133 | | $22,833 |
| (dollars in thousands) | 2017 | | 2016 |
| Deferred tax assets: | | | |
| Bad debts | $12,043 | | $17,187 |
| Pension and deferred compensation liability | 1,028 | | 1,310 |
| Non-qualified stock options | 4 | | 38 |
| Nonaccrual loan interest | 970 | | 2,061 |
| Long-term incentive plan | 2,043 | | 2,348 |
| Other | 399 | | 450 |
| | 16,487 | | 23,394 |
| Deferred tax liabilities: | | | |
| Accretion | 28 | | 121 |
| Depreciation | 3,614 | | 4,952 |
| Loan servicing rights | 793 | | 1,174 |
| State taxes | 426 | | 620 |
| Deferred loan fees | 0 | | 78 |
| Intangible assets | 1,261 | | 1,925 |
| REIT spillover dividend | 1,242 | | 1,479 |
| Prepaid expenses | 752 | | 959 |
| Other | 384 | | 418 |
| | 8,500 | | 11,726 |
| Valuation allowance | 0 | | 0 |
| Net deferred tax asset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . | $7,987 | | $11,668 |