Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
OPERATING ACTIVITIES
Net income	$ 103,619	$ 104,874
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Depreciation and amortization	16,019	13,600
Provision for loan losses	16,364	18,183
(Gain) loss on sale of investments	(5,563)	1
Net accretion of investment securities and assets	(22,663)	(27,882)
Net amortization (accretion) on borrowings	182	(341)
Stock-based compensation expense	6,249	5,416
(Gain) loss on sale of foreclosed assets held for sale	(16)	212
Gain on sale of mortgage loans held for sale	(8,257)	(5,832)
Deferred income taxes	4,940	2,052
Income from bank owned life insurance	(2,136)	(2,205)
Originations of mortgage loans held for sale	(282,204)	(265,704)
Proceeds from sale of mortgage loans held for sale	282,861	255,762
Changes in assets and liabilities:
Interest receivable	(1,494)	(555)
Lease right-of-use assets	(2,469)
Other assets	14,999	(7,140)
Accrued interest and other liabilities	(4,376)	29,161
Income taxes payable	2,553	(8,947)
Net cash provided by operating activities	118,608	110,655
INVESTING ACTIVITIES
Net originations of loans	(302,151)	(519,175)
Decrease in due from banks - time	395	340
Purchases of premises and equipment, net	(21,689)	(10,360)
Proceeds from sale of foreclosed assets held for sale	9,870	8,983
Proceeds from sale of available-for-sale securities	461,470	7,726
Proceeds from maturities of available-for-sale securities	289,493	122,963
Purchases of available-for-sale securities	(384,951)	(496,664)
Proceeds from maturities of held-to-maturity securities	25,406	34,958
Purchases of bank owned life insurance	0	(4,000)
Proceeds from bank owned life insurance death benefits	1,310	616
Disposition of assets and liabilities held for sale	1,393	(66,641)
Purchase of Reliance Bancshares, Inc	(37,017)	0
Net cash provided by (used in) investing activities	43,529	(921,254)
FINANCING ACTIVITIES
Net change in deposits	(107,806)	860,573
Proceeds from issuance of subordinated notes	0	326,355
Repayments of subordinated debentures	0	(54,642)
Dividends paid on preferred stock	(326)	0
Dividends paid on common stock	(30,265)	(27,922)
Net change in other borrowed funds	(178,756)	71,787
Net change in federal funds purchased and securities sold under agreements to repurchase	20,532	(22,643)
Net shares issued under stock compensation plans	(3,030)	1,869
Shares issued under employee stock purchase plan	1,312	1,026
Retirement of preferred stock	(42,000)	0
Net cash (used in) provided by financing activities	(340,339)	1,156,403
(DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(178,202)	345,804
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	833,458	598,042
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 655,256	$ 943,846