PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income	$ 3,410	$ 3,360	$ 3,063	$ 2,939	$ 2,950	$ 2,773	$ 2,476	$ 2,160	$ 12,772	$ 10,359	$ 9,166
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
(Increase) decrease in other assets									(2,287)	1,593	2,041
(Decrease) increase in other liabilities									1,737	(1,582)	(1,454)
Net cash provided by operating activities									22,824	18,680	15,423
Cash flows from investing activities:
Net cash used in investing activities									(327,667)	(186,698)	(152,076)
Cash flows from financing activities:
Net proceeds from issuance of common stock									10,507	28,088	1,395
Net proceeds from exercise of stock options											17
Repurchase of surrendered stock from exercise of stock options and vesting of restricted stock awards									(175)	(128)	(37)
Excess tax (expense) benefit from share based compensation									(18)	(16)	11
Cash dividends paid									(9,898)	(6,061)	(5,787)
Net cash provided by financing activities									276,546	224,646	125,424
Net (decrease) increase in cash and cash equivalents									(28,297)	56,628	(11,229)
Cash and cash equivalents at beginning of period				79,546				22,918	79,546	22,918	34,147
Cash and cash equivalents at end of period	51,249				79,546				51,249	79,546	22,918
Parent Company
Cash flows from operating activities:
Net income									12,772	10,359	9,166
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Equity in undistributed earnings of the Bank									(13,753)	(11,349)	(8,443)
(Increase) decrease in other assets									(7)	558	(450)
(Decrease) increase in other liabilities									(227)	198	(6)
Net cash provided by operating activities									(1,215)	(234)	267
Cash flows from investing activities:
Investment in the Bank									(7,000)	(12,000)
Cash in lieu of fractional shares for business acquisition										(3)
Net cash used in investing activities									(7,000)	(12,003)
Cash flows from financing activities:
Net proceeds from issuance of common stock									10,507	28,088	1,395
Net proceeds from exercise of stock options											17
Repurchase of surrendered stock from exercise of stock options and vesting of restricted stock awards									(175)	(128)	(37)
Excess tax (expense) benefit from share based compensation									(18)	(16)	11
Cash dividends paid									(9,898)	(6,061)	(5,787)
Net cash provided by financing activities									416	21,883	(4,401)
Net (decrease) increase in cash and cash equivalents									(7,799)	9,646	(4,134)
Cash and cash equivalents at beginning of period				13,002				3,356	13,002	3,356	7,490
Cash and cash equivalents at end of period	$ 5,203				$ 13,002				$ 5,203	$ 13,002	$ 3,356