PARENT COMPANY FINANCIAL INFORMATION - CONDENSED STATEMENTS OF CASH FLOWS (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 2,884	$ 2,633	$ 3,123	$ 2,834	$ 3,217	$ 2,718	$ 2,611	$ 1,323	$ 11,474	$ 9,869	$ 8,780
Adjustments for non-cash items -
NET CASH FLOWS FROM OPERATING ACTIVITIES									13,239	15,940	10,434
Cash flows from investing activities:
Purchases of securities available-for-sale									(163,859)	(92,180)	(74,083)
Proceeds from sales of available-for-sale securities									97,981	67,296	59,284
Cash paid for business acquisition									8,993	(9,114)	9,771
NET CASH FLOWS USED IN INVESTING ACTIVITIES									(65,567)	(11,002)	(587)
Cash flows from financing activities:
Principal payments on long-term debt									(5,410)	(745)	(3,395)
Proceeds from issuance of common stock									66	58	26,950
Cash dividends paid on common stock									(5,915)	(5,636)	(4,860)
NET CASH FLOWS PROVIDED BY (USED IN) FINANCING ACTIVITIES									51,470	(3,781)	(8,634)
NET CHANGE IN CASH AND CASH EQUIVALENTS									(858)	1,157	1,213
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR				15,845				14,688	15,845	14,688	13,475
CASH AND CASH EQUIVALENTS AT END OF YEAR	14,987				15,845				14,987	15,845	14,688
Parent Company
Cash flows from operating activities:
Net income									11,474	9,869	8,780
Adjustments for non-cash items -
(Increase) decrease in undistributed income of subsidiaries									(6,528)	(1,695)	1,819
Other, net									42	(474)	7
NET CASH FLOWS FROM OPERATING ACTIVITIES									4,988	7,700	10,606
Cash flows from investing activities:
Purchases of securities available-for-sale									(215)	(107)	(563)
Proceeds from sales of available-for-sale securities									1,217	227	569
Cash paid for business acquisition									(3,757)	(24,750)	(7,815)
NET CASH FLOWS USED IN INVESTING ACTIVITIES									(2,755)	(24,630)	(7,809)
Cash flows from financing activities:
Principal payments on long-term debt									0	0	(1,792)
Proceeds from issuance of common stock									390	372	27,238
Cash dividends paid on common stock									(6,239)	(5,950)	(5,148)
Other									165	0	70
NET CASH FLOWS PROVIDED BY (USED IN) FINANCING ACTIVITIES									(5,684)	(5,578)	20,368
NET CHANGE IN CASH AND CASH EQUIVALENTS									(3,451)	(22,508)	23,165
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR				$ 3,985				$ 26,493	3,985	26,493	3,328
CASH AND CASH EQUIVALENTS AT END OF YEAR	$ 534				$ 3,985				$ 534	$ 3,985	$ 26,493