CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash Flows from Operating Activities
Net income	$ 33,719	$ 709
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	1,440	1,511
Amortization of premiums and discounts on securities, net	2,362	989
Amortization of operating lease right-of-use assets	1,102	1,274
Other amortization and accretion, net	(4,437)	(1,531)
Stock based compensation	1,759	2,000
Origination of loans designated for sale	(163,863)	(73,223)
Sale of loans designated for sale	177,516	66,126
Provision for credit losses	(5,715)	29,513
Deferred income taxes	2,320	2,207
Losses on sale of securities	0	95
Gains on sale of loans	(5,570)	(2,138)
Gains on sale and write-downs of other real estate owned	(167)	(415)
Losses on disposition of fixed assets and write-downs upon transfer of bank premises to other real estate owned	315	219
Changes in operating assets and liabilities, net of effects from acquired companies:
Net decrease (increase) in other assets	4,658	(6,245)
Net increase in other liabilities	1,659	3,595
Net cash provided by operating activities	47,098	24,686
Cash Flows from Investing Activities
Maturities and repayments of debt securities available-for-sale	155,860	82,715
Maturities and repayments of debt securities held-to-maturity	43,291	8,894
Proceeds from sale of debt securities available-for-sale	0	27,765
Purchases of debt securities available-for-sale	(36,512)	(74,213)
Purchases of debt securities held-to-maturity	(160,031)	0
Net new loans and principal repayments	79,353	25,154
Proceeds from sale of other real estate owned	1,340	3,736
Additions to other real estate owned	(654)	0
Proceeds from sale of FHLB and Federal Reserve Bank Stock	2,704	27,923
Purchase of FHLB and Federal Reserve Bank Stock	(55)	(26,227)
Net cash from bank acquisition	0	33,883
Additions to bank premises and equipment	(341)	(570)
Net cash provided by investing activities	84,955	109,060
Cash Flows from Financing Activities
Net increase in deposits	453,188	129,005
Net decrease in repurchase agreements	(10,438)	(21,398)
Net decrease in FHLB borrowings with original maturities of three months or less	0	(170,000)
Proceeds from FHLB borrowings with original maturities of more than three months	0	120,000
Stock based employee benefit plans	434	(1,010)
Dividends paid	0	0
Net cash provided by financing activities	443,184	56,597
Net increase in cash and cash equivalents	575,237	190,343
Cash and cash equivalents at beginning of period	404,088	124,531
Cash and cash equivalents at end of period	979,325	314,874
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	3,695	10,259
Cash paid during the period for taxes	0	0
Recognition of operating lease right-of-use assets	0	33
Recognition of operating lease liabilities	0	33
Supplemental disclosure of non-cash investing activities:
Transfer of debt securities from available-for-sale to held-to-maturity	210,805	0
Transfers from loans to other real estate owned	0	5,571
Transfers from bank premises to other real estate owned	$ 3,318	$ 0