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Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets [Abstract]
Cash and due from banks	$ 741,749	$ 602,510
Interest-bearing cash and cash equivalents	401,675	1,714,544
Trading securities	1,956,923	462,676
Investment securities	355,187	461,793
Available for sale securities	8,857,120	8,321,578
Fair value option securities	283,235	755,054
Restricted equity securities	344,447	320,189
Residential mortgage loans held for sale	149,221	221,378
Loans	21,656,730	17,153,424
Allowance for loan losses	(207,457)	(230,682)
Loans, net of allowance	21,449,273	16,922,742
Premises and equipment, net	330,033	317,335
Receivables	204,960	178,800
Goodwill	1,049,263	447,430
Intangible assets, net	134,849	28,658
Mortgage servicing rights	259,254	252,867
Real estate and other repossessed assets, net of allowance	17,487	28,437
Derivative contracts	320,929	220,502
Cash surrender value of bank-owned life insurance	381,608	316,498
Receivable on unsettled securities sales	336,400	340,077
Other assets	446,891	359,092
Total assets	38,020,504	32,272,160
Deposits [Abstract]
Noninterest-bearing demand deposits	10,414,592	9,243,338
Interest-bearing Deposit Liabilities [Abstract]
Transaction	12,206,576	10,250,393
Savings	529,215	469,158
Time	2,113,380	2,098,416
Total deposits	25,263,763	22,061,305
Funds purchased and repurchase agreements	1,018,411	574,963
Other borrowings	6,124,390	5,134,897
Subordinated debentures	275,913	144,677
Accrued interest, taxes and expense	192,826	164,895
Derivative contracts	362,306	171,963
Due on unsettled securities purchases	156,370	338,745
Other liabilities	183,480	162,381
Total liabilities	33,577,459	28,753,826
Shareholders' equity: [Abstract]
Common stock	5	4
Capital surplus	1,334,030	1,035,895
Retained earnings	3,369,654	3,048,487
Treasury stock	(198,995)	(552,845)
Accumulated other comprehensive loss	(72,585)	(36,174)
Total shareholders’ equity	4,432,109	3,495,367
Non-controlling interests	10,936	22,967
Total equity	4,443,045	3,518,334
Total liabilities and equity	$ 38,020,504	$ 32,272,160

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Fair value option securities represent securities the Company has elected to carry at fair value and separately identified on the balance sheet with changes in fair value recognized in earnings as they occur. Certain residential mortgage-backed securities issued by US government agencies are held as an economic hedge of changes in the fair value of mortgage servicing rights and related derivative contracts. In addition, other securities may be held to manage interest rate risk or for deferred compensation purposes. Securities held for interest rate risk management may be economically hedged by derivative contracts not designated as hedging instruments effectively modify these fixed rate securities into variable rate securities.

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