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INCOME TAXES - Effective 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 [Abstract] |  |  |  |  |  |  |  |  |  |  |
Statutory tax rate |  |  |  |  |  |  |  |  | $ 27,108 | $ 19,104 | $ 15,928
State taxes, net of federal tax benefit |  |  |  |  |  |  |  |  | 1,675 | (974) | 1,810
Tax exempt income - investments, net |  |  |  |  |  |  |  |  | (3,849) | (3,463) | (2,796)
Bank-owned life insurance |  |  |  |  |  |  |  |  | (1,364) | (1,284) | (1,070)
Disallowed merger costs |  |  |  |  |  |  |  |  | 542 | 422 | 206
Non-deductible goodwill on disposal operations sale |  |  |  |  |  |  |  |  | 0 | 313 | 0
Tax credits, net of basis reduction |  |  |  |  |  |  |  |  | (6,225) | (8,308) | (1,658)
Change in valuation allowance |  |  |  |  |  |  |  |  | 125 | 0 | 0
Other, net |  |  |  |  |  |  |  |  | 772 | (746) | (657)
Income tax expense | $ 362 | $ 6,953 | $ 5,249 | $ 6,220 | $ 2,273 | $ 1,350 | $ 1,144 | $ 297 | $ 18,784 | $ 5,064 | $ 11,763
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |  |  |  |  |  |  |  |  |
Statutory tax rate (percent) |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
State taxes, net of federal tax benefit (percent) |  |  |  |  |  |  |  |  | 2.20% | (1.80%) | 4.00%
Tax exempt income - investments, net (percent) |  |  |  |  |  |  |  |  | (5.00%) | (6.30%) | (6.10%)
Bank-owned life insurance (percent) |  |  |  |  |  |  |  |  | (1.80%) | (2.40%) | (2.40%)
Disallowed merger costs (percent) |  |  |  |  |  |  |  |  | 0.70% | 0.80% | 0.50%
Non-deductible goodwill on disposal operations sale (percent) |  |  |  |  |  |  |  |  | 0.00% | 0.60% | 0.00%
Tax credits, net of basis reduction (percent) |  |  |  |  |  |  |  |  | (8.00%) | (15.20%) | (3.60%)
Change in valuation allowance (percent) |  |  |  |  |  |  |  |  | 0.20% | 0.00% | 0.00%
Other, net (percent) |  |  |  |  |  |  |  |  | 1.00% | (1.40%) | (1.50%)
Effective tax rate (percent) |  |  |  |  |  |  |  |  | 24.30% | 9.30% | 25.90%

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