PARENT CORPORATION ONLY FINANCIAL STATEMENTS (Details) - Condensed Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 18,565,000	$ 19,925,000	$ 17,507,000
Adjustments to reconcile net income to net cash provided by operating activities:
(Increase) decrease in other assets	2,200,000	414,000	(1,465,000)
Decrease in other liabilities	377,000	(1,792,000)	980,000
Stock based compensation	223,000	59,000	39,000
Cash flows from financing activities:
Cash dividends on common stock	(6,940,000)	(4,254,000)	(2,778,000)
Cash dividends on preferred stock	(140,000)	(141,000)	(363,000)
Proceeds from exercise of stock options	885,000	21,000	141,000
Decrease in cash and cash equivalents	44,155,000	(23,446,000)	(4,963,000)
Cash and cash equivalents at beginning of year	82,692,000	106,138,000	111,101,000
Cash and cash equivalents at the end of year	126,847,000	82,692,000	106,138,000
Parent Company [Member]
Cash flows from operating activities:
Net income	18,565,000	19,925,000	17,507,000
Adjustments to reconcile net income to net cash provided by operating activities:
Net gains on sales of available for sale securities		(22,000)	(26,000)
Equity in undistributed earnings of subsidiary	(9,890,000)	(15,916,000)	(15,709,000)
(Increase) decrease in other assets	(1,979,000)	(167,000)	563,000
Decrease in other liabilities	(1,010,000)	(276,000)	(772,000)
Stock based compensation	223,000	59,000	39,000
Net cash provided by operating activities	5,909,000	3,603,000	1,602,000
Cash flows from investing activities:
Proceeds from sales of available-for-sale securities		181,000	375,000
Purchase of available-for-sale securities			(410,000)
Net cash provided by (used in) investing activities		181,000	(35,000)
Cash flows from financing activities:
Cash dividends on common stock	(6,940,000)	(4,254,000)	(2,778,000)
Cash dividends on preferred stock	(140,000)	(141,000)	(363,000)
Issuance of restricted stock award		243,000
Issuance cost of common stock	(7,000)	(13,000)	(8,000)
Proceeds from exercise of stock options	885,000	21,000	141,000
Tax expense from stock based compensation	282,000	16,000	28,000
Net cash used in financing activities	(5,920,000)	(4,128,000)	(2,980,000)
Decrease in cash and cash equivalents	(11,000)	(344,000)	(1,413,000)
Cash and cash equivalents at beginning of year	285,000	629,000	2,042,000
Cash and cash equivalents at the end of year	$ 274,000	$ 285,000	$ 629,000