CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows From Operating Activities
Net Income	$ 124,403	$ 77,764	$ 98,739
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	5,482	6,020	6,421
Amortization of premiums and discounts on securities, net	6,220	5,019	2,548
Amortization of operating lease right-of-use assets	4,576	4,362	4,117
Other amortization and accretion, net	(13,908)	(8,667)	(2,005)
Stock based compensation	8,685	7,304	7,243
Origination of loans designated for sale	(490,426)	(511,706)	(329,177)
Sale of loans designated for sale	543,410	477,178	333,591
Provision for credit losses	(9,421)	38,179	10,999
Deferred income taxes	3,836	(4,926)	6,791
Losses (gains) on sale of securities	363	(1,096)	(1,031)
Gains on sale of loans	(15,276)	(13,930)	(9,794)
(Gains) losses on sale and write-downs of other real estate owned	(635)	1,139	(432)
Losses on disposition of fixed assets	817	791	511
Bank owned life insurance death benefits	0	0	(956)
Changes in operating assets and liabilities, net of effects from acquired companies:
Net increase in other assets	(42,437)	(35,555)	(5,614)
Net increase (decrease) in other liabilities	28,883	18,776	(4,206)
Net Cash Provided by Operating Activities	154,572	60,652	117,745
Cash Flows From Investing Activities
Maturities and repayments of available-for-sale debt securities	546,339	304,064	101,674
Maturities and repayments of held-to-maturity debt securities	132,916	75,861	42,495
Proceeds from sale of available-for-sale debt securities	84,972	96,732	202,724
Purchases of available-for-sale debt securities	(1,145,193)	(830,300)	(309,461)
Purchases of held-to-maturity debt securities	(377,159)	0	0
Maturities of time deposits with other banks	750	2,992	4,501
Net new loans and principal repayments	566,348	(79,100)	(109,614)
Purchases of loans held for investment	(259,267)	0	(270,791)
Proceeds from the sale of other real estate owned	5,598	8,521	6,509
Additions to other real estate owned	(2,513)	(2,557)	0
Proceeds from sale of FHLB and Federal Reserve Bank Stock	3,945	39,185	74,120
Purchase of FHLB and Federal Reserve Bank Stock	(3,020)	(28,278)	(75,193)
Redemption of bank owned life insurance	0	0	14,218
Net cash from bank acquisitions	98,100	71,965	0
Purchase of bank owned life insurance	(60,000)	0	0
Additions to bank premises and equipment	(4,327)	(1,587)	(2,523)
Net Cash Used in Investing Activities	(412,511)	(342,502)	(321,341)
Cash Flows From Financing Activities
Net increase in deposits	640,108	844,405	407,513
Net increase (decrease) in repurchase agreements	1,956	33,488	(128,202)
Net decrease in FHLB borrowings with original maturities of three months or less	0	(235,000)	(67,000)
Repayments of FHLB borrowings with original maturities of more than three months	(33,000)	(115,000)	(63,000)
Proceeds from FHLB borrowings with original maturities of more than three months	0	35,000	65,000
Stock based employee benefit plans	5,022
Stock based employee benefit plans		(1,486)	(2,135)
Dividends paid	(22,506)	0	0
Net Cash Provided by Financing Activities	591,580	561,407	212,176
Net increase in cash and cash equivalents	333,641	279,557	8,580
Cash and Cash Equivalents at Beginning of Year	404,088	124,531	115,951
Cash and Cash Equivalents at End of Year	737,729	404,088	124,531
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	9,977	23,548	46,130
Cash paid during the period for taxes	30,887	27,712	16,000
Recognition of operating lease right-of-use assets, other than through bank acquisition	12,459	2,095	30,301
Recognition of operating lease liabilities, other than through bank acquisition	12,459	2,095	34,627
Supplemental disclosure of non-cash investing activities:
Transfer of debt securities from available-for-sale to held-to-maturity	210,805	0	0
Transfer of debt securities from held-to-maturity to available-for-sale	0	0	52,796
Unsettled sales of debt securities available-for-sale	17,147	0	0
Transfer from loans to other real estate owned	0	5,624	5,665
Transfer from bank premises to other real estate owned	3,318	1,289	0
Transfer from loans held for investment to loans held for sale	$ 0	$ 0	$ 801