Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities:
Net income	$ 34,838	$ 51,906
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit loss expenses	16,836	7,420
Specific reserve, other real estate owned	537	8
Depreciation of bank premises and equipment	7,109	6,981
Gain on sale of bank premises and equipment	(358)	(43)
Gain on sale of other real estate owned	(79)	(469)
Accretion of investment securities discounts	(120)	(55)
Amortization of investment securities premiums	7,373	4,024
Investment securities transactions, net	5	4
Unrealized gain on equity securities with readily determinable fair values	(30)	(138)
Stock based compensation expense	219	265
Losses (earnings) from affiliates and other investments	521	(3,444)
Deferred tax expense	(14,123)	(1,435)
Increase in accrued interest receivable	(450)	(603)
Increase in other assets	(228)	(20,685)
Increase in other liabilities	4,571	23,962
Net cash provided by operating activities	56,621	67,698
Investing activities:
Proceeds from maturities of securities	1,075
Proceeds from sales and calls of available for sale securities	18,920	41,420
Purchases of available for sale securities	(421,017)	(145,966)
Principal collected on mortgage backed securities	257,223	132,820
Net increase in loans	(120,789)	(147,124)
Purchases of other investments	(6,760)	(13,045)
Distributions from other investments	26,382	46,677
Purchases of bank premises and equipment	(2,769)	(6,130)
Proceeds from sales of bank premises and equipment	370	1,510
Proceeds from sales of other real estate owned	2,034	707
Net cash used in investing activities	(245,331)	(89,131)
Financing activities:
Net increase in non-interest bearing demand deposits	118,934	103,879
Net decrease (increase) in savings and interest-bearing demand deposits	22,127	78,512
Net increase (decrease) in time deposits	42,793	16,994
Net increase (decrease) in securities sold under repurchase agreements	29,936	48,641
Net decrease (increase) in other borrowed funds	101,954	(194,770)
Purchase of treasury stock	(29,371)	(54)
Proceeds from stock transactions	225	598
Net cash (used in) provided by financing activities	286,598	53,800
(Decrease) increase in cash and cash equivalents	97,888	32,367
Cash and cash equivalents at beginning of period	256,820	316,797
Cash and cash equivalents at end of period	354,708	349,164
Supplemental cash flow information:
Interest paid	13,353	13,982
Income taxes paid	206
Non-cash investing and financing activities:
Net transfers from loans to other real estate owned	486	704
Dividends declared, not yet paid on common stock	35,128	32,822
Establishment of lease liability and right-of-use asset		$ 6,171
Net transfers from bank premises and equipment to other assets	$ 7,546