CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 173,573	$ 161,817
Interest-bearing deposits in other banks	9,032,807	4,233,766
Federal funds sold and securities purchased under resale agreements	0	30,000
Investment securities	3,196,970	239,871
Loans held for sale ($239.1 million and $2,571.3 million at December 2020 and 2019, respectively, at fair value)	283,165	2,577,134
Loans held for investment, mortgage finance	9,079,409	8,169,849
Loans held for investment (net of unearned income)	15,351,451	16,476,413
Less: Allowance for credit losses on loans	(254,615)	(195,047)
Loans held for investment, net	24,176,245	24,451,215
Mortgage servicing rights, net	105,424	64,904
Premises and equipment, net	24,546	31,212
Accrued interest receivable and other assets	715,699	740,051
Goodwill and intangible assets, net	17,667	18,099
Total assets	37,726,096	32,548,069
Deposits:
Non-interest-bearing	12,740,947	9,438,459
Interest-bearing	18,255,642	17,040,134
Total deposits	30,996,589	26,478,593
Accrued interest payable	$ 11,150	$ 12,760
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilities	us-gaap:OtherLiabilities
Other liabilities	$ 339,486	$ 318,094
Federal funds purchased and repurchase agreements	111,751	141,766
Other borrowings	3,000,000	2,400,000
Subordinated notes, net	282,490	282,129
Trust preferred subordinated debentures	113,406	113,406
Total liabilities	34,854,872	29,746,748
Comprehensive income:
Preferred stock, $.01 par value, $1,000 liquidation value: Authorized shares - 10,000,000; Issued shares - 6,000,000 shares issued at December 31, 2018 and 2017	150,000	150,000
Common stock, $.01 par value: Authorized shares - 100,000,000; Issued shares - 45,735,424 and 41,036,787 at December 31, 2018 and 2017, respectively	504	503
Additional paid-in capital	991,898	978,205
Retained earnings	1,713,056	1,663,671
Treasury stock (shares at cost: 417 at December 31, 2020 and 2019)	(8)	(8)
Accumulated other comprehensive income, net of taxes	15,774	8,950
Total stockholders’ equity	2,871,224	2,801,321
Total liabilities and stockholders’ equity	$ 37,726,096	$ 32,548,069