Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating activities:
Net income	$ 31,884	$ 44,262
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and accretion	1,894	6,373
Provision for credit losses	22,191	3,300
Stock based compensation	2,492	1,985
Deferred income tax expense	1,292	658
Securities losses, net	0	267
Gains from sales of other loans	(1,674)	(1,303)
Changes in assets and liabilities:
Other assets and accrued interest receivable	(45,851)	(6,251)
Accrued expenses and other liabilities	8,456	(5,994)
Loans held for sale	(31,475)	(7,406)
Net cash (used in) provided by operating activities	(10,791)	35,891
Debt securities held-to-maturity:
Proceeds from maturities and calls	9,085	9,049
Purchases	(15,989)	0
Debt securities available-for-sale and equity securities:
Proceeds from sales	1,000	178,604
Proceeds from maturities and calls	105,247	60,779
Purchases	(70,075)	(34,729)
Net increase in loans	(110,222)	(90,380)
Proceeds from sales of premises and equipment	102	105
Purchases of premises and equipment	(2,596)	(11,686)
Proceeds from sale of other real estate	63	974
Other investing activities, net	(1,600)	0
Net cash (used in) provided by investing activities	(84,985)	112,716
Financing activities:
Net increase in deposits	137,783	117
Repayment of long-term debt	0	(10,110)
Proceeds from FHLB advances	5,000	780,000
Repayment of FHLB advances	(5,000)	(900,000)
Proceeds from issuance of common stock for dividend reinvestment and employee benefit plans	199	186
Proceeds from exercise of stock options	0	197
Cash paid for shares withheld to cover payroll taxes upon vesting of restricted stock	(1,674)	(549)
Repurchase of common stock	(20,782)	(7,342)
Cash dividends on common stock	(14,454)	(12,876)
Net cash provided by (used in) financing activities	101,072	(150,377)
Net change in cash and cash equivalents, including restricted cash	5,296	(1,770)
Cash and cash equivalents, including restricted cash, at beginning of period	515,206	327,265
Cash and cash equivalents, including restricted cash, at end of period	520,502	325,495
Significant non-cash investing and financing transactions:
Unsettled government guaranteed loan sales	485	13,934
Transfers of loans to foreclosed properties	127	751
Unsettled repurchases of common stock	$ 0	$ 498