BUSINESS SEGMENTS (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			12 Months Ended
	Mar. 31, 2014 item	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
Business segments
Number of reportable segments	3
Loans and leases, net of unearned income	$ 4,161,067	$ 4,312,352	$ 3,469,263	$ 4,312,352
Total allowance for loans and lease losses	(81,180)	(82,034)	(94,519)	(82,034)		(91,968)
Total loans and leases, net	4,079,887	4,230,318	3,374,744	4,230,318
Goodwill	208,743	208,743	79,673	208,743	215,862	79,866
Core deposit and customer relationship intangibles, net	15,884	17,248	13,547	17,248
Total assets	6,517,853	6,533,363	5,299,905	6,533,363
Total deposits	5,369,408	5,280,987	4,553,230	5,280,987
Interest income	88,360	83,856	69,269
Other interest expense	(2,345)	(2,598)	(3,576)
Net interest income	86,015	81,258	65,693
Negative provision (provision) for credit losses	644	1,338	(3,137)
FDIC loss sharing income (expense), net	(11,430)	(10,593)	(3,137)
Gain (Loss) on sale of securities	4,752	(272)	409
Other noninterest income	11,369	6,939	5,568
Total noninterest income	4,691	(3,926)	2,840
Accelerated vesting of restricted stock		(12,420)
OREO income, net	1,861	569	500
Intangible asset amortization	(1,364)	(1,430)	(1,176)	(1,430)
Acquisition and integration costs	(2,200)	(4,253)	(692)
Other noninterest expense	(49,166)	(48,554)	(42,815)
Total noninterest expense	(50,869)	(66,088)	(44,183)
Earnings from continuing operations before income taxes	40,481	12,582	21,213
Income tax (expense) benefit	(14,576)	(9,135)	(7,719)
Net earnings from continuing operations	25,905	3,447	13,494
Loss from discontinued operations before income taxes	(1,413)	(578)
Income tax (expense) benefit	588	240
Net loss from discontinued operations	(825)	(338)
Net earnings	25,080	3,109	13,494
Banking
Business segments
Loans and leases, net of unearned income	3,707,308		3,004,525
Total allowance for loans and lease losses	(74,833)		(89,382)
Total loans and leases, net	3,632,475		2,915,143
Goodwill	183,065		53,995
Core deposit and customer relationship intangibles, net	14,139		11,159
Total assets	5,990,162		4,773,916
Total deposits	5,415,691		4,580,514
Other interest expense	(1,227)	(1,451)	(2,650)
Net interest income	76,590	71,181	54,728
Negative provision (provision) for credit losses	826	2,026	(2,336)
FDIC loss sharing income (expense), net	(11,430)	(10,593)	(3,137)
Gain (Loss) on sale of securities	4,752	(272)	409
Other noninterest income	6,897	5,933	5,001
Total noninterest income	219	(4,932)	2,273
Accelerated vesting of restricted stock		(12,420)
OREO income, net	1,861	569	500
Intangible asset amortization	(1,191)	(1,274)	(993)
Acquisition and integration costs	(2,200)	(4,253)	(692)
Other noninterest expense	(40,990)	(41,248)	(35,346)
Total noninterest expense	(42,520)	(58,626)	(36,531)
Earnings from continuing operations before income taxes	35,115	9,649	18,134
Income tax (expense) benefit	(12,334)	(7,902)	(6,430)
Net earnings from continuing operations	22,781	1,747
Loss from discontinued operations before income taxes	(1,413)	(578)
Income tax (expense) benefit	588	240
Net loss from discontinued operations	(825)	(338)
Net earnings	21,956	1,409	11,704
Asset Financing
Business segments
Loans and leases, net of unearned income	453,759		464,738
Total allowance for loans and lease losses	(6,347)		(5,137)
Total loans and leases, net	447,412		459,601
Goodwill	25,678		25,678
Core deposit and customer relationship intangibles, net	1,745		2,388
Total assets	517,126		504,554
Other interest expense	(77)	(85)	(143)
Net interest income	10,466	11,139	11,748
Negative provision (provision) for credit losses	(182)	(688)	(801)
Other noninterest income	4,445	979	544
Total noninterest income	4,445	979	544
Intangible asset amortization	(173)	(156)	(183)
Other noninterest expense	(6,573)	(5,720)	(6,053)
Total noninterest expense	(6,746)	(5,876)	(6,236)
Earnings from continuing operations before income taxes	7,983	5,554	5,255
Income tax (expense) benefit	(3,331)	(2,287)	(2,199)
Net earnings from continuing operations	4,652	3,267
Net earnings	4,652	3,267	3,056
Other
Business segments
Total assets	10,565		21,435
Total deposits	(46,283)		(27,284)
Other interest expense	(1,041)	(1,062)	(783)
Net interest income	(1,041)	(1,062)	(783)
Other noninterest income	27	27	23
Total noninterest income	27	27	23
Other noninterest expense	(1,603)	(1,586)	(1,416)
Total noninterest expense	(1,603)	(1,586)	(1,416)
Earnings from continuing operations before income taxes	(2,617)	(2,621)	(2,176)
Income tax (expense) benefit	1,089	1,054	910
Net earnings from continuing operations	(1,528)	(1,567)
Net earnings	(1,528)	(1,567)	(1,266)
Operating segment
Business segments
Interest income	88,360	83,856	69,269
Operating segment | Banking
Business segments
Interest income	77,595	72,391	56,907
Operating segment | Asset Financing
Business segments
Interest income	10,765	11,465	12,362
Intersegment | Banking
Business segments
Net interest income	222	241	471
Intersegment | Asset Financing
Business segments
Net interest income	$ (222)	$ (241)	$ (471)