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	$ 79,283	$ 51,653
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation and amortization	16,354	14,112
Change In Unamortized Net Loan Costs And Premiums	(18,558)	(4,064)
Provision for credit losses	(7,500)	45,000
Deferred income tax expense	469	3,045
Net unrealized (gain) loss on equity securities	(864)	415
Gain (Loss) on Disposition of Property Plant Equipment	60	368
Realized gain on sale leaseback transaction	(289)	(289)
Stock based compensation	2,760	2,429
Increase in cash surrender value of life insurance policies	(2,912)	(2,588)
Gain Realized on Life Insurance Policies	(258)	(692)
Operating Lease, Payments	(6,088)	(5,887)
Operating lease termination payments	(4,750)	0
Change in Fair Value on Loans Held for Sale	1,459	(839)
Net change in:
Trading assets	(601)	(362)
Loans held for sale	31,084	(11,249)
Other assets	79,393	(191,261)
Increase (Decrease) in Other Operating Liabilities	(51,289)	86,847
Total adjustments	38,470	(65,015)
Net cash provided by (used in) operating activities	117,753	(13,362)
Proceeds from Sale of Debt and Equity Securities, FV-NI, Held-for-investment	1,164	0
Cash flows used in investing activities
Increase (Decrease) in Equity Securities, FV-NI	(1,415)	(212)
Proceeds from maturities and principal repayments of securities available for sale	51,536	50,262
Payments to Acquire Debt Securities, Available-for-sale	(438,903)	(30,095)
Proceeds from maturities and principal repayments of securities held to maturity	137,258	105,272
Purchases of securities held to maturity	(274,781)	(95,017)
Net redemption (purchases) of Federal Home Loan Bank stock	1,171	(666)
Investments in low income housing projects	(9,556)	(14,008)
Purchases of life insurance policies	(40,102)	(101)
Proceeds from Life Insurance Policy	576	2,629
Net (increase) decrease in loans	468,901	(481,372)
Purchases of bank premises and equipment	(6,970)	(5,186)
Proceeds from the sale of bank premises and equipment	4	23
Net cash used in investing activities	(111,117)	(468,471)
Cash flows provided by financing activities
Net decrease in time deposits	(133,295)	(302,738)
Net increase in other deposits	1,127,111	1,872,552
Increase (Decrease) in Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Net	0	55,000
Increase Decrease in Federal Home Loan Bank Advances Long Term	0	(25,000)
Repayments of Debt	(9,375)	(37,500)
Net Purchases from Stock Options Exercised	(57)	(26)
Restricted stock awards issued, net of awards surrendered	(1,243)	(1,183)
Proceeds from shares issued under direct stock purchase plan	1,033	1,092
Payments for shares repurchased under share repurchase program	0	(95,091)
Common dividends paid	(31,016)	(30,527)
Net cash provided by financing activities	953,158	1,436,579
Net increase in cash and cash equivalents	959,794	954,746
Cash and cash equivalents at beginning of year	1,296,636	150,974
Cash and cash equivalents at end of period	2,256,430	1,105,720
Supplemental schedule of noncash activities
Net increase in capital commitments relating to low income housing project investments	34,232	27,937
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 5,873	$ 5,356