CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flow From Operating Activities:
Net income	$ 205,531	$ 148,600	$ 164,460
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	0	58,673	2,800
Depreciation and amortization	10,701	11,009	9,383
Change in deferred taxes	6,983	(9,735)	4,965
Share-based compensation	4,762	4,600	4,115
Loans originated for sale	(548,742)	(591,057)	(511,407)
Proceeds from sales of loans held for sale	557,744	611,945	513,357
Gains on sales of loans held for sale	(16,223)	(15,817)	(6,209)
Gains on sales of securities available for sale	(5,674)	(11,895)	(4,415)
Increase in cash surrender of life insurance	(4,873)	(5,040)	(4,518)
Gains on life insurance benefits	(2,187)	(100)	(19)
Change in interest receivable	(3,239)	(5,047)	(4,659)
Change in interest payable	(525)	(3,467)	1,090
Other adjustments	3,124	11,162	7,784
Net cash provided by operating activities	207,382	203,831	176,727
Cash Flows from Investing Activities:
Net change in interest-bearing deposits	(81,849)	(274,042)	199,928
Purchases of:
Securities available for sale	(931,368)	(613,117)	(676,791)
Securities held to maturity	(1,156,621)	(699,095)	(423,385)
Proceeds from sales of securities available for sale	181,333	231,391	132,837
Proceeds from maturities of:
Securities available for sale	279,367	322,617	138,356
Securities held to maturity	227,255	273,229	130,502
Net change in loans	(60,581)	(792,986)	(512,364)
Net cash and cash equivalents received (paid) in acquisition	(2,933)	0	10,207
Proceeds from the sale of other real estate owned	706	8,655	2,060
Proceeds from life insurance benefits	8,764	601	815
Proceeds from mortgage portfolio loan sale	78,159	0	0
Other investing activities	(11,678)	(9,278)	(8,564)
Net cash used in investing activities	(1,469,446)	(1,552,025)	(1,006,399)
Net change in :
Demand and savings deposits	1,556,127	2,336,120	883,524
Certificates of deposit and other time deposits	(185,160)	(814,466)	95,913
Borrowings	45,542	573,757	599,298
Repayment of borrowings	(96,204)	(621,548)	(643,169)
Cash dividends on common stock	(61,230)	(56,542)	(51,276)
Stock issued under employee benefit plans	605	639	702
Stock issued under dividend reinvestment and stock purchase plans	1,880	1,726	1,531
Stock options exercised	198	115	144
Repurchase of common stock	(25,444)	(55,912)	(19,041)
Net cash provided by financing activities	1,236,314	1,363,889	867,626
Net Change in Cash and Cash Equivalents	(25,750)	15,695	37,954
Cash and Cash Equivalents, January 1	192,896	177,201	139,247
Cash and Cash Equivalents, December 31	167,146	192,896	177,201
Additional cash flow information:
Interest paid	36,477	69,848	107,598
Income tax paid	31,168	33,201	23,588
Loans transferred to other real estate owned	292	813	7,031
Fixed assets transferred to other assets	6,384	262	1,210
Non-cash investing activities using trade date accounting	39,923	6,183	0
ROU assets obtained in exchange for new operating lease liabilities	2,700	1,601	23,529
Liabilities assumed in conjunction with acquisitions
Fair value of assets acquired	4,041	0	1,451,287
Cash received (paid) in acquisition	(3,225)	0	(15)
Less: Common stock issued	0	0	229,926
Liabilities assumed	$ 816	$ 0	$ 1,221,346