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NOTE PAYABLE AND LINES OF CREDIT (Details) $ in Thousands		12 Months Ended
	Dec. 13, 2017 USD ($)	Dec. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($) item	Dec. 31, 2015 USD ($)	Feb. 01, 2015 USD ($)
NOTE PAYABLE AND LINES OF CREDIT
Capital to Risk Weighted Assets		15.40%	12.90%
Frost Bank | Line of Credit
NOTE PAYABLE AND LINES OF CREDIT
Revolving line of credit available	$ 30,000
Revolving line of credit draw period	12 months
Debt term	60 months
Line of credit payment terms	payable quarterly in the first 12 months and thereafter quarterly principal and interest payments are required over a term of 60 months
Outstanding borrowings		$ 0
Federal Home Loan Bank | Line of Credit
NOTE PAYABLE AND LINES OF CREDIT
Total borrowing capacity available		793,300	$ 767,800
Outstanding borrowings		0	0
Federal Home Loan Bank | Federal funds line of credit
NOTE PAYABLE AND LINES OF CREDIT
Revolving line of credit available		75,000	$ 75,000
Outstanding borrowings		$ 0
Number of federal funds line of credit | item		4	4
Minimum | Frost Bank | Line of Credit
NOTE PAYABLE AND LINES OF CREDIT
Tangible Capital	$ 240,000
Free cash flow coverage ratio	125.00%
Maximum | Frost Bank | Line of Credit
NOTE PAYABLE AND LINES OF CREDIT
Capital to Risk Weighted Assets	12.00%
Maximum | Frost Bank | Line of Credit | TEXAS
NOTE PAYABLE AND LINES OF CREDIT
Capital to Risk Weighted Assets	15.00%
Notes payable
NOTE PAYABLE AND LINES OF CREDIT
Loan amount					$ 31,000
Interest paid		$ 1,078	$ 1,063	$ 758

X

- Definition

Represents the period, from the beginning date of the loan agreement, an entity may draw from the credit facility's borrowing capacity.

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Represents the number of federal funds line of credit.

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Total Capital divided by risk weighted assets as defined in the regulations.

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Face (par) amount of debt instrument at time of issuance.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of excess Total Capital divided by risk weighted assets which are assets that are weighted for credit risk according to a formula used by the Reserve Bank.

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Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

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Description of the frequency of the required periodic payments of interest, principal, or both, and the amount, if set, or a description of a formula upon which payment is based.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Tangible capital as defined in the regulations (generally includes outstanding stock plus retained earnings) for banking institutions subject to Office of Thrift Supervision (OTS) capital requirements.

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