Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
ASSETS:
Cash and due from banks	$ 235,061	$ 233,215
Interest-earning deposits in financial institutions	312,735	165,222
Total cash, cash equivalents, and restricted cash	547,796	398,437
Securities available-for-sale, at fair value	3,801,986	3,774,431
Federal Home Loan Bank stock, at cost	17,250	20,790
Total investment securities	3,819,236	3,795,221
Trade and Loans Receivables Held-for-sale, Net, Not Part of Disposal Group	0	481,100
Gross loans and leases held for investment	16,516,627	17,032,221
Deferred fees, net	(61,342)	(59,478)
Allowance for loan and lease losses	(134,275)	(139,456)
Total loans and leases held for investment, net	16,321,010	16,833,287
Equipment leased to others under operating leases	280,648	284,631
Premises and equipment, net	33,686	31,852
Foreclosed assets, net	1,236	1,329
Deferred tax asset, net	12,584	0
Goodwill	2,548,670	2,548,670
Core deposit and customer relationship intangibles, net	73,280	79,626
Other assets	511,184	540,723
Total assets	24,149,330	24,994,876
LIABILITIES AND STOCKHOLDERS' EQUITY
Noninterest-bearing deposits	8,232,140	8,508,044
Interest-bearing deposits	9,846,648	10,357,492
Total deposits	18,078,788	18,865,536
Borrowings	575,284	467,342
Subordinated debentures	452,223	462,437
Accrued interest payable and other liabilities	175,545	221,963
Total liabilities	19,281,840	20,017,278
Commitments and contingencies
Preferred stock ($0.01 par value; 5,000,000 shares authorized; none issued and outstanding)	0	0
Common stock ($0.01 par value, 200,000,000 shares authorized at March 31, 2018 and December 31, 2017; 126,537,871 and 130,491,108 shares issued, respectively, including 1,383,914 and 1,436,120 shares of unvested restricted stock, respectively)	1,283	1,305
Additional paid-in capital	4,111,226	4,287,487
Retained earnings	835,611	723,471
Treasury stock, at cost (1,763,416 and 1,708,230 shares at March 31, 2018 and December 31, 2017)	(68,694)	(65,836)
Accumulated other comprehensive income, net	(11,936)	31,171
Total stockholders' equity	4,867,490	4,977,598
Total liabilities and stockholders' equity	$ 24,149,330	$ 24,994,876