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BASIS OF PRESENTATION, NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING AND REPORTING POLICIES (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 USD ($) location segment item $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares
Number of locations | location |  | 33 |  |
Number of reportable segment | segment |  | 1 |  |
Reserve required at federal reserve bank |  | $ 15,800,000 | $ 16,100,000 |
Cash deposits in excess of the amount insured by the FDIC |  | 91,800,000 | 79,200,000 |
FHLB stock |  | $ 1,200,000 | 1,200,000 |
FRB stock, par value | $ / shares |  | $ 100 |  |
FRB stock, par value - Member's Bank | $ / shares |  | $ 50 |  |
Federal Reserve Bank stock |  | $ 9,300,000 | 9,300,000 |
The Independent Bankers Financial Corporation stock |  | $ 141,000 | 141,000 |
Number of private investment funds under the Small Business Investment Company (SBIC) program | item |  | 2 |  |
Private investment funds |  | $ 1,600,000 | 1,500,000 |
Unfunded commitments |  | $ 3,800,000 | $ 4,000,000 |
Treasury stock repurchased (in shares) | shares |  | 0 | 635,100 | 246,708
Treasury stock repurchased (in dollars per share) | $ / shares |  |  | $ 17.56 | $ 17.60
Statutory rate (as a percent) |  | 35.00% | 35.00% | 35.00%
Contractual maturities |  | 10 years |  |
Cash flow information: |  |  |  |
Cash paid for taxes |  | $ 13,752,000 | $ 11,390,000 | $ 11,050,000
Dividends accrued for restricted stock |  | 11,000 |  |
Real estate acquired through foreclosure |  | $ 881,000 | 2,671,000 | 823,000
Forecast |  |  |  |
Statutory rate (as a percent) | 21.00% |  |  |
Customer relationships |  |  |  |
Amortization period |  | 15 years |  |
Minimum |  |  |  |
Amortization period |  | 7 years |  |
Minimum | Core deposits |  |  |  |
Amortization period |  | 7 years |  |
Maximum |  |  |  |
Amortization period |  | 20 years |  |
Maximum | Core deposits |  |  |  |
Amortization period |  | 10 years |  |
Buildings |  |  |  |
Useful life (in years) |  | 32 years |  |
Furniture and equipment | Minimum |  |  |  |
Useful life (in years) |  | 3 years |  |
Furniture and equipment | Maximum |  |  |  |
Useful life (in years) |  | 10 years |  |
Vehicles |  |  |  |
Useful life (in years) |  | 3 years |  |
Notes payable |  |  |  |
Cash flow information: |  |  |  |
Cash paid for interest |  | $ 1,078,000 | 1,063,000 | 758,000
Junior subordinated debt |  |  |  |
Cash flow information: |  |  |  |
Cash paid for interest |  | 315,000 | 258,000 | 220,000
Deposits and repurchase agreements |  |  |  |
Cash flow information: |  |  |  |
Cash paid for interest |  | $ 7,701,000 | $ 7,051,000 | $ 6,452,000

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