OPERATING SEGMENTS (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 item	Jun. 30, 2013
OPERATING SEGMENTS
Number of reportable operating segments			2
Operating segments
Net interest income (expense)	$ 44,329,000	$ 41,104,000	$ 87,095,000	$ 83,041,000
Provision for loan losses	3,989,000	2,700,000	7,385,000	5,100,000
Non-interest income	14,506,000	15,606,000	18,929,000	30,404,000
Non-interest expense	39,263,000	37,935,000	84,623,000	77,418,000
Income before income taxes	15,583,000	16,075,000	14,016,000	30,927,000
Income tax expense (benefit)	4,119,000	4,038,000	3,658,000	8,425,000
Net income	11,464,000	12,037,000	10,358,000	22,502,000
Average assets	6,146,000,000	5,199,000,000	5,998,000,000	5,208,000,000
Operating segment | Banking
Operating segments
Net interest income (expense)	45,244,000	42,086,000	88,954,000	84,989,000
Provision for loan losses	3,989,000	2,700,000	7,385,000	5,100,000
Non-interest income	12,046,000	13,204,000	13,420,000	25,022,000
Non-interest expense	36,970,000	35,267,000	79,543,000	71,956,000
Income before income taxes	16,331,000	17,323,000	15,446,000	32,955,000
Income tax expense (benefit)	4,409,000	4,503,000	4,217,000	9,208,000
Net income	11,922,000	12,820,000	11,229,000	23,747,000
Average assets	6,111,000,000	5,175,000,000	5,971,000,000	5,189,000,000
Operating segment | Insurance
Operating segments
Non-interest income	2,460,000	2,402,000	5,509,000	5,382,000
Non-interest expense	1,887,000	2,038,000	4,209,000	4,171,000
Income before income taxes	573,000	364,000	1,300,000	1,211,000
Income tax expense (benefit)	223,000	158,000	509,000	468,000
Net income	350,000	206,000	791,000	743,000
Average assets	27,000,000	27,000,000	26,000,000	27,000,000
Reportable legal entity | Parent
Operating segments
Net interest income (expense)	(915,000)	7,018,000	(1,859,000)	13,052,000
Non-interest income	12,272,000	5,026,000	12,020,000	9,490,000
Non-interest expense	406,000	630,000	871,000	1,291,000
Income before income taxes	10,951,000	11,414,000	9,290,000	21,251,000
Income tax expense (benefit)	(513,000)	(623,000)	(1,068,000)	(1,251,000)
Net income	11,464,000	12,037,000	10,358,000	22,502,000
Average assets	744,000,000	746,000,000	733,000,000	751,000,000
Eliminations
Operating segments
Net interest income (expense)		(8,000,000)		(15,000,000)
Non-interest income	(12,272,000)	(5,026,000)	(12,020,000)	(9,490,000)
Income before income taxes	(12,272,000)	(13,026,000)	(12,020,000)	(24,490,000)
Net income	(12,272,000)	(13,026,000)	(12,020,000)	(24,490,000)
Average assets	$ (736,000,000)	$ (749,000,000)	$ (732,000,000)	$ (758,000,000)