CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest incomeand divided income:
Loans	$ 531,022	$ 548,571	$ 571,685
Investment securities	50,905	54,850	60,372
Money market investments	3,365	2,148	1,892
Total interest income	585,292	605,569	633,949
Interest expense:
Deposits	67,302	69,250	78,127
Securities sold under agreements to repurchase	20,203	22,431	26,989
Advances from FHLB	5,964	4,171	3,561
Other borrowings	7,705	7,451	7,199
Total interest expense	101,174	103,303	115,876
Net interest income	484,118	502,266	518,073
Provision for loan and lease losses	86,733	172,045	109,530
Net interest income after provision for loan and lease losses	397,385	330,221	408,543
Non-interest income:
Service charges and fees on deposit accounts	22,965	20,330	16,709
Mortgage banking activities	20,435	17,217	14,685
Net gain on sale of investments	6,104	0	262
Gain from recovery of investments previously written off	1,547	0	0
Other-than-temporary impairment (OTTI) losses on available-for-sale debt securities:
Total other-than-temporary impairment losses	(1,845)	(35,806)	0
Portion of loss previously recognized in other comprehensive income	(4,842)	19,289	(388)
Net impairment losses on available-for-sale debt securities	(6,687)	(16,517)	(388)
Gain on early extinguishment of debt	4,217	0	0
Equity in loss of unconsolidated entity	0	0	(7,279)
Insurance commission income	8,473	7,058	6,868
Bargain purchase gain	0	13,443	0
Gain on sale of merchant contracts	0	7,000	0
Other non-interest income	30,900	32,794	30,491
Total non-interest income	87,954	81,325	61,348
Non-interest expenses:
Employees' compensation and benefits	151,493	150,059	135,422
Occupancy and equipment	55,159	59,295	58,290
Business promotion	11,419	15,234	16,531
Professional fees	44,137	55,632	47,940
Taxes, other than income taxes	15,139	12,669	18,089
Insurance and supervisory fees	24,920	29,021	39,131
Net loss on other real estate owned (OREO) and OREO operations	11,533	15,788	20,596
Credit and debit card processing expenses	13,635	16,177	15,449
Communications	6,759	7,726	7,766
Other non-interest expenses	20,886	22,229	19,039
Total non-interest expenses	355,080	383,830	378,253
Income before income taxes	130,259	27,716	91,638
Income tax (expense) benefit	(37,030)	(6,419)	300,649
Net income	93,229	21,297	392,287
Net income attributable to common stockholders	$ 93,006	$ 21,297	$ 393,946
Net income per common share:
Basic	$ 0.44	$ 0.1	$ 1.89
Diluted	0.43	0.1	1.87
Dividends declared per common share	$ 0	$ 0	$ 0