CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash Flows from Operating Activities
Net income	$ 65,129	$ 25,789
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	2,792	3,031
Amortization of premiums and discounts on securities, net	4,012	1,746
Amortization of operating lease right-of-use assets	2,127	2,363
Other amortization and accretion, net	(7,307)	(366)
Stock based compensation	4,262	3,524
Origination of loans designated for sale	(283,001)	(203,935)
Sale of loans designated for sale	318,479	174,450
Provision for credit losses	(10,570)	37,124
Deferred income taxes	4,833	(3,328)
Losses (gains) on sale of securities	73	(1,092)
Gains on sale of loans	(9,411)	(5,303)
Gains on sale and write-downs of other real estate owned	(380)	(485)
Losses on disposition of fixed assets and write-downs upon transfer of bank premises to other real estate owned	316	220
Changes in operating assets and liabilities, net of effects from acquired companies:
Net decrease (increase) in other assets	1,086	(22,451)
Net (decrease) increase in other liabilities	(10,726)	19,139
Net cash provided by operating activities	81,714	30,426
Cash Flows from Investing Activities
Maturities and repayments of debt securities available-for-sale	288,171	134,488
Maturities and repayments of debt securities held-to-maturity	73,697	33,969
Proceeds from sale of debt securities available-for-sale	56,217	92,314
Purchases of debt securities available-for-sale	(468,430)	(239,160)
Purchases of debt securities held-to-maturity	(172,004)	0
Maturities of time deposits with other banks	0	1,246
Net new loans and principal repayments	346,173	(431,182)
Purchases of loans held for investment	(38,822)	0
Proceeds from sale of other real estate owned	4,954	4,503
Additions to other real estate owned	(1,310)	0
Proceeds from sale of FHLB and Federal Reserve Bank Stock	2,704	33,448
Purchase of FHLB and Federal Reserve Bank Stock	(59)	(26,227)
Net cash from bank acquisition	0	33,883
Purchase of bank owned life insurance	(25,000)	0
Additions to bank premises and equipment	(701)	(880)
Net cash provided by (used in) investing activities	65,590	(363,598)
Cash Flows from Financing Activities
Net increase in deposits	903,875	908,288
Net increase in repurchase agreements	364	6,004
Net decrease in FHLB borrowings with original maturities of three months or less	0	(315,000)
Proceeds from FHLB borrowings with original maturities of more than three months	0	135,000
Stock based employee benefit plans	369	(1,331)
Dividends paid	(7,155)	0
Net cash provided by financing activities	897,453	732,961
Net increase in cash and cash equivalents	1,044,757	399,789
Cash and cash equivalents at beginning of period	404,088	124,531
Cash and cash equivalents at end of period	1,448,845	524,320
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	6,462	15,756
Cash paid during the period for taxes	17,700	3,492
Recognition of operating lease right-of-use assets	35	52
Recognition of operating lease liabilities	35	52
Supplemental disclosure of non-cash investing activities:
Transfer of debt securities from available-for-sale to held-to-maturity	210,805	0
Unsettled purchases of debt securities available-for-sale	28,750	0
Transfers from loans to other real estate owned	0	6,186
Transfers from bank premises to other real estate owned	$ 3,318	$ 1,289