CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Operating activities:
Net income	$ 9,987	$ 30,317
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,427	3,326
Provision (credit)	24,469	(128)	$ 4,684
Stock based compensation expense	754	690
Tax benefits associated with share based compensation	28	41
Deferred income tax expense/ (benefit)	(5,205)	1,069
Origination of loans held for sale	(217,560)	(97,286)
Proceeds from sales of loans held for sale	208,409	97,456
Gains on sales of loans held for sale	(4,262)	(2,395)
Losses on sales of other real estate owned	9	0
Investment securities gains	(169)	0
Increase (Decrease) in Operating Capital [Abstract]
Net increase in accrued interest receivable	(588)	(1,573)
Net (increase)/ decrease in other assets	(19,317)	5,191
Net increase/(decrease) in accrued expenses and other liabilities	7,976	(10,381)
Other - net	5,055	992
Net cash provided by operating activities	13,013	27,319
Investing activities:
(Purchases) of other equity securities	(10,582)
Proceeds from other equity securities		12,620
Purchases of investments available-for-sale	(241,682)	(15,919)
Proceeds from sales of investment available-for-sale	13,104	0
Proceeds from maturities, calls and principal payments of investments available-for-sale	127,111	34,829
Net (increase) in loans	(17,760)
Net decrease in loans		1,644
Proceeds from the sales of other real estate owned	27	0
Acquisition of business activity, net of cash paid	(26,925)	0
Expenditures for premises and equipment	(696)	(1,066)
Net cash provided by/ (used in) investing activities	(157,403)	32,108
Financing activities:
Net increase in deposits	153,555	309,643
Net decrease in retail repurchase agreements and federal funds purchased	(88,300)	(204,803)
Proceeds from advances from FHLB	250,000	1,079,000
Repayment of advances from FHLB	(9,716)	(1,201,333)
Retirement of subordinated debt	(10,310)	0
Proceeds from issuance of common stock	412	343
Stock tendered for payment of withholding taxes	0	(101)
Repurchase of common stock	(25,702)	0
Dividends paid	(10,544)	(10,008)
Net cash provided by/ (used in) financing activities	259,395	(27,259)
Net increase in cash and cash equivalents	115,005	32,168
Cash and cash equivalents at beginning of period	146,103	101,481	101,481
Cash and cash equivalents at end of period	261,108	133,649	$ 146,103
Supplemental Disclosures:
Interest payments	17,055	21,455
Income tax payments	0	0
Transfer of investments held-to-maturity to available-for-sale	0	0
Transfer from loans to residential mortgage loans held for sale	0	0
Transfers from loans to other real estate owned	$ 0	$ 0