CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash Flows from Operating Activities
Net income	$ 20,588	$ 33,719
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	1,420	1,440
Amortization of premiums and discounts on securities, net	361	2,362
Amortization of operating lease right-of-use assets	990	1,102
Other amortization and accretion, net	(1,173)	(4,437)
Stock based compensation	1,419	1,759
Origination of loans designated for sale	(57,625)	(163,863)
Sale of loans designated for sale	71,210	177,516
Provision for credit losses	6,556	(5,715)
Deferred income taxes	866	2,320
Gains on sale of loans	(2,324)	(5,570)
Gains on sale and write-downs of other real estate owned	(255)	(167)
Losses on disposition of fixed assets and write-downs upon transfer of bank premises to other real estate owned	31	315
Changes in operating assets and liabilities, net of effects from acquired companies:
Net decrease in other assets	15,471	4,658
Net (decrease) increase in other liabilities	(3,001)	1,659
Net cash provided by operating activities	54,534	47,098
Cash Flows from Investing Activities
Maturities and repayments of debt securities available-for-sale	95,398	155,860
Maturities and repayments of debt securities held-to-maturity	26,430	43,291
Proceeds from sale of debt securities available-for-sale	26,011	0
Purchases of debt securities available-for-sale	(244,551)	(36,512)
Purchases of debt securities held-to-maturity	(134,941)	(160,031)
Maturities of time deposits with other banks	498	0
Net new loans and principal repayments	(44,256)	79,353
Purchases of loans held for investment	(111,292)	0
Proceeds from sale of other real estate owned	3,742	1,340
Additions to other real estate owned	(319)	(654)
Proceeds from sale of FHLB and Federal Reserve Bank Stock	0	2,704
Purchase of FHLB and Federal Reserve Bank Stock	(3,347)	(55)
Net cash from bank acquisitions	208,933	0
Additions to bank premises and equipment	(825)	(341)
Net cash used in investing activities	(178,519)	84,955
Cash Flows from Financing Activities
Net increase in deposits	613,899	453,188
Net decrease in repurchase agreements	(643)	(10,438)
Stock based employee benefit plans	3,509	434
Dividends paid	(7,994)	0
Net cash provided by financing activities	608,771	443,184
Net increase in cash and cash equivalents	484,786	575,237
Cash and cash equivalents at beginning of period	737,729	404,088
Cash and cash equivalents at end of period	1,222,515	979,325
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	1,673	3,695
Recognition of operating lease right-of-use assets, other than through bank acquisitions	3,370	0
Recognition of operating lease liabilities, other than through bank acquisitions	3,370	0
Supplemental disclosure of non-cash investing activities:
Transfer of debt securities from available-for-sale to held-to-maturity	0	210,805
Transfers from bank premises to other real estate owned	$ 1,008	$ 3,318