CONSOLIDATED STATEMENTS OF INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest incomeand divided income:
Loans	$ 532,684	$ 531,022	$ 548,571
Investment securities	51,125	50,905	54,850
Money market investments	4,614	3,365	2,148
Total interest income	588,423	585,292	605,569
Interest expense:
Deposits	66,537	67,302	69,250
Securities sold under agreements to repurchase	10,911	20,203	22,431
Advances from FHLB	11,140	5,964	4,171
Other borrowings	8,284	7,705	7,451
Total interest expense	96,872	101,174	103,303
Net interest income	491,551	484,118	502,266
Provision for loan and lease losses	144,254	86,733	172,045
Net interest income after provision for loan and lease losses	347,297	397,385	330,221
Non-interest income:
Service charges and fees on deposit accounts	22,314	22,965	20,330
Mortgage banking activities	13,491	20,435	17,217
Net gain on sale of investments	371	6,104	0
Gain from recovery of investments previously written off	0	1,547	0
Other-than-temporary impairment (OTTI) losses on available-for-sale debt securities:
Total other-than-temporary impairment losses	(12,231)	(1,845)	(35,806)
Portion of other-than-temporary impairment recognized in other comprehensive income (OCI)	0	(4,842)	19,289
Net impairment losses on available-for-sale debt securities	(12,231)	(6,687)	(16,517)
Gain on early extinguishment of debt	1,391	4,217	0
Insurance commission income	8,197	8,473	7,058
Bargain purchase gain	0	0	13,443
Gain on sale of merchant contracts	0	0	7,000
Other non-interest income	28,854	30,900	32,794
Total non-interest income	62,387	87,954	81,325
Non-interest expenses:
Employees' compensation and benefits	151,845	151,493	150,059
Occupancy and equipment	56,659	55,159	59,295
Business promotion	12,485	11,419	15,234
Professional fees	45,929	44,137	55,632
Taxes, other than income taxes	14,550	15,139	12,669
Insurance and supervisory fees	18,534	24,920	29,021
Net loss on other real estate owned (OREO) and OREO operations	10,997	11,533	15,788
Credit and debit card processing expenses	13,212	13,635	16,177
Communications	6,148	6,759	7,726
Other non-interest expenses	17,342	20,886	22,229
Total non-interest expenses	347,701	355,080	383,830
Income before income taxes	61,983	130,259	27,716
Income tax benefit (expense)	4,973	(37,030)	(6,419)
Net income	66,956	93,229	21,297
Net income attributable to common stockholders	$ 64,280	$ 93,006	$ 21,297
Net income per common share:
Basic	$ 0.3	$ 0.44	$ 0.1
Diluted	0.3	0.43	0.1
Dividends declared per common share	$ 0	$ 0	$ 0