PARENT COMPANY - Statement of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements
Net income	$ 14,883	$ 12,618	$ 12,125
Net change in other assets	3,294	146	790
Net change in other liabilities	(6,192)	1,792	(860)
Net cash provided by operating activities	22,200	20,566	16,495
Proceeds from exercise of stock options	144	328	225
Tax benefit from exercise of stock options	50	115	14
Cash dividends paid	(7,695)	(7,096)	(7,085)
Net cash provided by (used in) provided by financing activities	32,872	119,045	(13,665)
(Decrease) increase in cash and cash equivalents	(67,230)	(4,276)	38,988
Cash and cash equivalents beginning of period	150,183	154,459	115,471
Cash and cash equivalents end of period	82,953	150,183	154,459
Parent Company
Condensed Financial Statements
Net income	14,883	12,618	12,125
Net change in other assets	(902)	(686)	138
Net change in other liabilities	68	444	(67)
Equity in undistributed earnings of subsidiaries	(9,602)	(7,242)	(5,857)
Net cash provided by operating activities	4,447	5,134	6,339
Tax benefit from exercise of stock options		115	14
Cash dividends paid	(7,695)	(7,096)	(7,167)
Other, net	4,118	1,204	214
Net cash provided by (used in) provided by financing activities	(3,577)	(5,777)	(6,939)
(Decrease) increase in cash and cash equivalents	870	(643)	(600)
Cash and cash equivalents beginning of period	1,554	2,197	2,797
Cash and cash equivalents end of period	$ 2,424	$ 1,554	$ 2,197