CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash Flows from Operating Activities
Net income	$ 82,580	$ 88,073
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	4,267	4,139
Amortization of premiums and discounts on securities, net	630	5,353
Amortization of operating lease right-of-use assets	4,434	3,263
Other amortization and accretion, net	557	(11,715)
Stock based compensation	6,620	7,492
Origination of loans designated for sale	(148,444)	(406,392)
Sale of loans designated for sale	184,045	438,422
Provision for credit losses	12,054	(5,479)
Deferred income taxes	1,309	3,325
Losses on sale of securities	0	73
Gains on sale of loans	(5,082)	(12,450)
Gains on sale and write-downs of other real estate owned	(1,302)	(380)
Losses on disposition of fixed assets and write-downs upon transfer of bank premises to other real estate owned	1,127	684
Changes in operating assets and liabilities, net of effects from acquired companies:
Net (increase) decrease in other assets	(6,273)	4,899
Net increase (decrease) in other liabilities	10,841	(14,543)
Net cash provided by operating activities	147,363	104,764
Cash Flows from Investing Activities
Maturities and repayments of debt securities available-for-sale	219,868	417,189
Maturities and repayments of debt securities held-to-maturity	69,665	103,254
Proceeds from sale of debt securities available-for-sale	26,011	57,209
Purchases of debt securities available-for-sale	(673,656)	(848,122)
Purchases of debt securities held-to-maturity	(206,065)	(235,077)
Maturities of time deposits with other banks	1,992	0
Net new loans and principal repayments	(282,514)	559,920
Purchases of loans held for investment	(111,292)	(236,699)
Proceeds from sale of other real estate owned	14,208	4,954
Additions to other real estate owned	(590)	(2,134)
Proceeds from sale of FHLB and Federal Reserve Bank Stock	0	3,945
Purchase of FHLB and Federal Reserve Bank Stock	(3,428)	(59)
Net cash from bank acquisitions	208,933	98,100
Purchase of bank owned life insurance	0	(50,000)
Additions to bank premises and equipment	(11,799)	(1,697)
Net cash used in investing activities	(748,667)	(129,217)
Cash Flows from Financing Activities
Net increase in deposits	135,545	906,690
Net decrease in repurchase agreements	(27,374)	(14,061)
Repayments of FHLB borrowings with original maturities of more than three months	0	(33,000)
Stock based employee benefit plans	3,031	3,287
Dividends paid	(29,012)	(14,856)
Net cash provided by financing activities	82,190	848,060
Net (decrease) increase in cash and cash equivalents	(519,114)	823,607
Cash and cash equivalents at beginning of period	737,729	404,088
Cash and cash equivalents at end of period	218,615	1,227,695
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	6,906	8,334
Cash paid during the period for taxes	19,591	28,200
Recognition of operating lease right-of-use assets, other than through bank acquisitions, net of terminations	1,968	35
Recognition of operating lease liabilities, other than through bank acquisitions, net of terminations	1,968	35
Supplemental disclosure of non-cash investing activities:
Transfer of debt securities from available-for-sale to held-to-maturity	0	210,805
Unsettled purchases of debt securities available-for-sale	0	8,064
Transfers from bank premises to other real estate owned	$ 1,008	$ 3,318