OPERATING SEGMENTS (Details) (USD $)	3 Months Ended
	Mar. 31, 2013 item	Mar. 31, 2012
OPERATING SEGMENTS
Number of reportable operating segments	2
Operating segments
Net interest income (expense)	$ 41,937,000	$ 31,145,000
Provision for loan losses	2,400,000	2,000,000
Non-interest income	14,798,000	9,802,000
Non-interest expense	39,483,000	30,194,000
Income from continuing operations before income taxes	14,852,000	8,753,000
Income tax expense (benefit)	4,387,000	2,272,000
Net income from continuing operations	10,465,000	6,481,000
Income from discontinued operations before income taxes (including gain on disposal of $63)		(261,000)
Income tax expense		376,000
Net loss from discontinued operations		(637,000)
Net income	10,465,000	5,844,000
Average assets	5,240,000,000	3,997,000,000
Banking
Operating segments
Net interest income (expense)	42,901,000	31,352,000
Provision for loan losses	2,400,000	2,000,000
Non-interest income	11,818,000	7,056,000
Non-interest expense	36,687,000	27,617,000
Income from continuing operations before income taxes	15,632,000	8,791,000
Income tax expense (benefit)	4,705,000	2,188,000
Net income from continuing operations		6,603,000
Income from discontinued operations before income taxes (including gain on disposal of $63)		(261,000)
Income tax expense		376,000
Net loss from discontinued operations		(637,000)
Net income	10,927,000	5,966,000
Average assets	5,203,000,000	3,954,000,000
Insurance
Operating segments
Non-interest income	2,980,000	2,746,000
Non-interest expense	2,134,000	2,214,000
Income from continuing operations before income taxes	846,000	532,000
Income tax expense (benefit)	310,000	214,000
Net income from continuing operations		318,000
Net income	536,000	318,000
Average assets	27,000,000	30,000,000
Parent
Operating segments
Net interest income (expense)	6,036,000	(207,000)
Non-interest income	4,463,000	6,284,000
Non-interest expense	662,000	363,000
Income from continuing operations before income taxes	9,837,000	5,714,000
Income tax expense (benefit)	(628,000)	(130,000)
Net income from continuing operations		5,844,000
Net income	10,465,000	5,844,000
Average assets	755,000,000	494,000,000
Eliminations
Operating segments
Net interest income (expense)	(7,000,000)
Non-interest income	(4,463,000)	(6,284,000)
Income from continuing operations before income taxes	(11,463,000)	(6,284,000)
Net income from continuing operations		(6,284,000)
Net income	(11,463,000)	(6,284,000)
Average assets	$ (745,000,000)	$ (481,000,000)