CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 79,990	$ 17,512	$ 40,027
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for credit losses	20,469	(500)
Provision for credit losses			3,000
Depreciation and amortization, premises and equipment	9,438	10,769	12,954
Amortization of premiums, discounts: AFS securities, deposits, debt	9,013	7,655	7,914
Operating leases: excess of payments over amortization	(3,488)	(2,597)	0
Amortization of finance leases	1,277	2,029	0
Amortization of core deposit intangibles	1,372	1,636	1,626
Amortization of deferred loan fees and costs	1,195	1,643	(1,984)
Share-based compensation expense	2,693	(163)	3,361
Net (gain) loss on sale of investment securities	(341)	7	(235)
Loss on lease abandonment and exit costs	10,873	16,619	5,096
Deferred income tax expense (benefit)	(10,065)	(29,903)	12,777
Loss on debt extinguishment	1,492	0	0
Origination of LHFS	(2,453,110)	(3,757,549)	(6,075,290)
Proceeds from sale of LHFS	2,407,287	4,097,511	6,448,808
Net fair value adjustment and gain on sale of LHFS	(81,439)	(78,994)	(93,766)
Origination of mortgage servicing rights	(31,012)	(34,606)	(61,871)
Net gain on sale of LHFI	(6,895)	(9,534)	(1,956)
Change in fair value of mortgage servicing rights	37,567	35,902	(6,711)
Amortization of MSRs	5,657	5,214	4,383
Gain on sale of mortgage servicing rights	0	(6,206)	0
(Increase) decrease in other assets	(38,728)	14,932	(8,064)
Increase (decrease) in accounts payable and other liabilities	11,210	(32,547)	(4,058)
Net cash provided by (used in) operating activities	(25,545)	258,830	286,011
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of investment securities	(373,264)	(330,532)	(189,660)
Proceeds from sale of investment securities	62,378	184,871	46,081
Principal payments on investment securities	208,610	145,771	106,798
Proceeds from sale of OREO	650	1,138	836
Proceeds from sale of LHFI	576,388	769,354	548,770
Purchase of LHFI	(20,124)	0
Purchase of LHFI			(1,953)
Proceeds from sale of mortgage servicing rights	0	3,255	65,369
Net cash provided by disposal of discontinued operations	2,800	182,189	0
Net increase in LHFI	(690,302)	(822,474)	(1,132,521)
Proceeds from sale of premises and equipment	1,460	0	808
Purchases of premises and equipment	(3,298)	(2,257)	(9,724)
Net cash used for acquisitions	0	(47,389)	0
Proceeds from sale of Federal Home Loan Bank stock	145,801	161,254	179,789
Purchases of Federal Home Loan Bank stock	(143,721)	(138,156)	(178,647)
Net cash provided by (used in) investing activities	(232,622)	107,024	(564,054)
CASH FLOWS FROM FINANCING ACTIVITIES:
Increase in deposits, net	481,464	213,572	290,152
Repayment of long term borrowings	(7,082)	(56,000)	(31,500)
Changes in short term borrowings, net	(143,200)	(424,000)	4,000
Repayment of finance lease principal	(1,209)	(1,694)	0
Repurchases of common stock	(58,009)	(98,543)	0
Proceeds from stock issuance, net	237	105	68
Dividends paid on common stock	(13,865)	0	0
Net cash provided by (used in) financing activities	258,336	(366,560)	262,720
Net increase (decrease) in cash and cash equivalents	169	(706)	(15,323)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH:
Cash, cash equivalents and restricted cash, beginning of year	57,880	58,586	73,909
Cash, cash equivalents and restricted cash, end of year	58,049	57,880	58,586
Less restricted cash included in other assets	0	0	604
CASH AND CASH EQUIVALENTS AT END OF YEAR	58,049	57,880	57,982
Cash paid (received) during the period for:
Interest	44,466	93,325	67,552
Federal and state income taxes	20,992	33,625	(5,785)
Non-cash activities:
LHFI foreclosed and transferred to OREO	370	915	455
Loans transferred from HFI to HFS	595,529	916,483	634,205
Loans transferred from HFS to HFI	25,995	8,705	71,584
Ginnie Mae loans recognized with the right to repurchase, net	92,366	0	0
Loans Derecognized With Right to Repurchase	0	28,281	1,674
Repurchase of common stock - award settlement	860	0	0
Receivable from sale of mortgage servicing rights	0	2,117	3,337
Acquisition:
Assets acquired	0	116,402	0
Liabilities assumed	0	74,941	0
Goodwill	$ 0	$ 5,928	$ 0