CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Operating activities:
Net income/ (loss)	$ (14,338)	$ 28,276	$ (4,351)	$ 58,593
Adjustments to reconcile net income/ (loss) to net cash provided by operating activities:
Depreciation and amortization			9,309	6,724
Provision for credit losses	58,686	1,633	83,155	1,505	$ 4,684
Share based compensation expense			1,792	1,473
Tax benefits associated with share based compensation			140	57
Deferred income tax expense/ (benefit)			(21,282)	1,795
Origination of loans held for sale			(546,596)	(299,401)
Proceeds from sales of loans held for sale			539,159	278,290
Gains on sales of loans held for sale			(7,627)	(6,627)
Losses on sales of other real estate owned			32	173
Investment securities gains	(212)	(5)	(381)	(5)
Increase (Decrease) in Operating Capital [Abstract]
Net increase in accrued interest receivable			(17,176)	(1,540)
Net increase in other assets			(4,456)	(4,880)
Net increase/(decrease) in accrued expenses and other liabilities			8,389	(6,126)
Other - net			1,019	1,162
Net cash provided by operating activities			41,126	31,193
Investing activities:
(Purchases) of other equity securities			(6,646)
Proceeds from other equity securities				18,699
Purchases of investments available-for-sale			(393,286)	(15,919)
Proceeds from sales of investment available-for-sale			112,301	0
Proceeds from maturities, calls and principal payments of investments available-for-sale			201,671	66,887
Net (increase) in loans			(1,116,931)
Net decrease in loans				19,979
Proceeds from the sales of other real estate owned			60	324
Cash paid for the acquisition of business activity of RPJ, net of cash acquired			(26,925)	0
Cash acquired in the acquisition of business activity of Revere Bank , net of cash paid			80,466	0
Expenditures for premises and equipment			(1,695)	(2,456)
Net cash provided by/ (used in) investing activities			(1,150,985)	87,514
Financing activities:
Net increase in deposits			1,314,093	474,869
Net increase/ (decrease) in retail repurchase agreements and federal funds purchased			774,999	(176,825)
Proceeds from advances from FHLB			400,000	2,123,000
Repayment of advances from FHLB			(630,348)	(2,388,843)
Retirement of subordinated debt			(10,310)	0
Proceeds from issuance of common stock			932	746
Stock tendered for payment of withholding taxes			(437)	(702)
Repurchase of common stock			(25,702)	0
Dividends paid			(24,748)	(20,757)
Net cash provided by financing activities			1,798,479	11,488
Net increase in cash and cash equivalents			688,620	130,195
Cash and cash equivalents at beginning of period			146,103	101,481	101,481
Cash and cash equivalents at end of period	$ 834,723	$ 231,676	834,723	231,676	$ 146,103
Supplemental Disclosures:
Interest payments			32,472	43,348
Income tax payments			17,532	18,629
Transfers from loans to other real estate owned			$ 0	$ 414