CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities
Net income	$ 124,015	$ 216,556
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	101,718	9,550
Depreciation, amortization and accretion, net	49,598	49,976
Deferred income tax (benefits) provision	(11,022)	19,124
Stock-based compensation	8,175	4,707
Other (gains) losses	(29)	18
Originations of loans held for sale	(232,682)	(12,960)
Proceeds from sales of loans held for sale	220,217	11,856
Net (gains) losses on sales of loans originated for investment and held for sale	(7,883)	1,156
Net losses on investment securities	102	2,592
Change in assets and liabilities:
Net increase in other assets	(25,094)	(46,083)
Net decrease in other liabilities	(126,178)	(85,425)
Net cash provided by operating activities	100,937	171,067
Available-for-sale securities:
Proceeds from maturities and principal repayments	1,022,539	536,058
Proceeds from calls and sales	644,703	943,630
Purchases	(3,187,042)	(999,490)
Other investments:
Proceeds from sales	26,348	9,238
Purchases	(48,603)	(19,429)
Loans:
Net (increase) decrease in loans and leases resulting from originations and principal repayments	(445,652)	55,138
Proceeds from sales of loans originated for investment	132,011	407,698
Purchases of loans	(40,611)	(247,711)
Proceeds from bank-owned life insurance	3,046	5,612
Purchases of premises, equipment and software	(27,717)	(22,370)
Proceeds from sales of other real estate owned	787	759
Other	(3,126)	(2,023)
Net cash (used in) provided by investing activities	(1,923,317)	667,110
Cash flows from financing activities
Net increase (decrease) in deposits	2,452,768	(292,822)
Repayment of short-term borrowings	(400,000)
Repayment of long-term borrowings	(9)	(10)
Dividends paid	(101,322)	(104,392)
Stock tendered for payment of withholding taxes	(1,745)	(1,764)
Common stock repurchased	(5,000)	(98,809)
Net cash provided by (used in) financing activities	1,944,692	(497,797)
Net increase in cash and cash equivalents	122,312	340,380
Cash and cash equivalents at beginning of period	694,017	1,003,637
Cash and cash equivalents at end of period	816,329	1,344,017
Supplemental disclosures
Interest paid	45,432	80,886
Income taxes paid, net of income tax refunds	48,271	69,173
Noncash investing and financing activities:
Transfers from loans and leases to other real estate owned	437	75
Operating lease right-of-use assets obtained in exchange for new lease obligations	1,965	1,401
Transfers from loans and leases to loans held for sale	145,428	408,912
Obligation to fund low-income housing partnerships	$ 17,906	$ 36,010