Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash Flows From Operating Activities
Net income	$ 14,628	$ 45,871
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	41,500	1,362
Stock-based compensation expense	2,172	2,285
Depreciation, amortization and accretion	13,151	8,182
Investment securities gain, net	249	1,847
Net realized (gain) loss on sale of premises and equipment and OPPO	25	(1)
Net realized loss on sale and valuation adjustments of OREO	0	(209)
Originations of loans held for sale	58,199	21,542
Proceeds from sales of loans held for sale	66,216	21,374
Net change in:
Interest receivable	2,262	(1,512)
Interest payable	2,325	1,154
Other assets	(63,141)	(5,244)
Other liabilities	44,725	2,179
Net cash provided by operating activities	65,365	52,472
Cash Flows From Investing Activities
Loans originated, net of principal collected	(197,362)	(80,407)
Purchases of debt securities available for sale	(37,472)	(3,710)
Payments to Acquire Loans Receivable	0	49,039
Purchases of premises and equipment	(1,650)	(1,788)
Payments for repayment of FLHB advances	(51,240)	(57,280)
Proceeds from sale of debt securities, available-for-sale	194,105	83,968
Proceeds from principal repayments and maturities of debt securities available for sale	134,641	100,876
Proceeds from sales of premises and equipment	31	11
Proceeds from redemption of Federal Home Loan Bank stock	61,080	57,640
Proceeds from sales of other real estate and other personal property owned	50	150
Proceeds from bank owned life insurance death benefit	1,050	0
Net cash provided by investing activities	103,233	50,421
Cash Flows From Financing Activities
Net increase (decrease) in deposits	128,059	(89,027)
Net decrease in sweep repurchase agreements	(35,185)	(38,076)
Proceeds from FHLB advances	1,281,000	1,432,000
Proceeds from FRB borrowings	182,010	0
Proceeds from other borrowings	5,000	0
Proceeds from exercise of stock options	945	878
Repayment of FHLB advances	(1,527,000)	(1,441,000)
Repayment of FRB borrowings	177,010	0
Payment of common stock dividends	(35,860)	(30,750)
Purchase of treasury stock	(20,000)	0
Purchase and retirement of common stock	2,474	2,432
Net cash used in financing activities	(200,515)	(168,407)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(31,917)	(65,514)
Cash and cash equivalents at beginning of period	247,673	277,587
Cash and cash equivalents at end of period	215,756	212,073
Supplemental Information:
Cash paid for interest	6,150	6,712
Cash paid for income tax, net of refunds	12	(146)
Non-cash investing and financing activities
Loans transferred to other real estate owned	0	386
Premises and equipment expenditures incurred but not yet paid	238	35
Change in dividends payable on unvested shares included in other liabilities	$ 157	$ 14