Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 119,290,000	$ 86,526,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities
Depreciation and amortization	24,586,000	21,071,000
Change In Unamortized Net Loan Costs And Premiums	(22,566,000)	(9,406,000)
Provision for credit losses	(17,500,000)	52,500,000
Deferred income tax expense	271,000	2,802,000
Net unrealized (gain) loss on equity securities	(695,000)	107,000
Gain (Loss) on Disposition of Property Plant Equipment	32,000	363,000
Loss on Termination of Derivatives	0	684,000
Sale and Leaseback Transaction, Gain (Loss), Net	433,000	433,000
Stock based compensation	3,467,000	3,297,000
Increase in cash surrender value of life insurance policies	(4,508,000)	(3,902,000)
Gain Realized on Life Insurance Policies	(258,000)	(692,000)
Operating Lease, Payments	(8,993,000)	(8,899,000)
Operating lease termination payments	(4,750,000)	0
Change in Fair Value on Loans Held for Sale	1,534,000	(1,252,000)
Net change in:
Trading assets	(666,000)	(433,000)
Loans held for sale	23,017,000	(20,154,000)
Other assets	16,700,000	(200,520,000)
Increase (Decrease) in Other Operating Liabilities	28,267,000	89,164,000
Total adjustments	37,505,000	(75,703,000)
Net cash provided by operating activities	156,795,000	10,823,000
Proceeds from Sale of Debt and Equity Securities, FV-NI, Held-for-investment	1,164,000	0
Cash flows used in investing activities
Increase (Decrease) in Equity Securities, FV-NI	(1,522,000)	(331,000)
Proceeds from maturities and principal repayments of securities available for sale	75,442,000	74,898,000
Payments to Acquire Debt Securities, Available-for-sale	(1,106,079,000)	(58,704,000)
Proceeds from maturities and principal repayments of securities held to maturity	199,304,000	176,841,000
Purchases of securities held to maturity	(340,713,000)	(95,017,000)
Net redemption (purchases) of Federal Home Loan Bank stock	1,584,000	(666,000)
Investments in low income housing projects	(19,236,000)	(15,586,000)
Purchases of life insurance policies	(40,116,000)	(116,000)
Proceeds from Life Insurance Policy	576,000	2,629,000
Net decrease (increase) in loans	603,773,000	(525,626,000)
Purchases of bank premises and equipment	(16,114,000)	(8,283,000)
Proceeds from the sale of bank premises and equipment	78,000	283,000
Payments on early termination of hedging relationship	0	(684,000)
Net cash used in investing activities	(641,859,000)	(450,362,000)
Cash flows provided by financing activities
Net decrease in time deposits	(165,052,000)	(336,289,000)
Net increase in other deposits	1,432,037,000	2,040,615,000
Increase (Decrease) in Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Net	0	55,000,000
Increase Decrease in Federal Home Loan Bank Advances Long Term	(10,000,000)	(25,000,000)
Repayments of Debt	(14,063,000)	(37,500,000)
Net Purchases from Stock Options Exercised	(57,000)	114,000
Restricted stock awards issued, net of awards surrendered	(1,246,000)	(1,186,000)
Proceeds from shares issued under direct stock purchase plan	1,515,000	1,620,000
Payments for shares repurchased under share repurchase program	0	(95,091,000)
Common dividends paid	(46,875,000)	(45,681,000)
Net cash provided by financing activities	1,196,259,000	1,556,602,000
Net increase in cash and cash equivalents	711,195,000	1,117,063,000
Cash and cash equivalents at beginning of year	1,296,636,000	150,974,000
Cash and cash equivalents at end of period	2,007,831,000	1,268,037,000
Supplemental schedule of noncash activities
Net increase in capital commitments relating to low income housing project investments	34,127,000	28,027,000
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 5,888,000	$ 7,693,000