Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 86,526,000	$ 117,698,000
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	21,071,000	13,919,000
Change In Unamortized Net Loan Costs And Premiums	(9,406,000)	(7,262,000)
Provision for credit losses	52,500,000	2,000,000
Deferred income tax expense	2,802,000	171,000
Net unrealized (gain) loss on equity securities	107,000	(1,562,000)
Gain (Loss) on Investments		1,462,000
Net loss on bank premises and equipment	363,000	180,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, After Tax	684,000	0
Gains (Losses) on Sales of Other Real Estate	0	389,000
Realized gain on sale leaseback transaction	(433,000)	(433,000)
Stock based compensation	3,297,000	3,413,000
Increase in cash surrender value of life insurance policies	(3,902,000)	(3,572,000)
Gain Realized on Life Insurance Policies	(692,000)	(434,000)
Operating Lease, Payments	(8,899,000)	(7,798,000)
Change in Fair Value on Loans Held for Sale	(1,252,000)	(1,192,000)
Net change in:
Trading assets	(433,000)	(459,000)
Loans held for sale	(20,154,000)	37,672,000
Other assets	(200,520,000)	(57,624,000)
Increase (Decrease) in Other Operating Liabilities	89,164,000	40,668,000
Total adjustments	(75,703,000)	19,538,000
Net cash provided by operating activities	10,823,000	137,236,000
Cash flows used in investing activities
Proceeds from Sale of Debt and Equity Securities, FV-NI, Held-for-investment	0	1,461,000
Increase (Decrease) in Equity Securities, FV-NI	(331,000)	(356,000)
Proceeds from Sale of Debt Securities, Available-for-sale		45,863,000
Proceeds from maturities and principal repayments of securities available for sale	74,898,000	35,770,000
Payments to Acquire Debt Securities, Available-for-sale	(58,704,000)	(16,230,000)
Proceeds from maturities and principal repayments of securities held to maturity	176,841,000	87,313,000
Purchases of securities held to maturity	(95,017,000)	(56,937,000)
Net redemption (purchases) of Federal Home Loan Bank stock	(666,000)	18,344,000
Investments in low income housing projects	(15,586,000)	(3,549,000)
Purchases of life insurance policies	(116,000)	(115,000)
Proceeds from Life Insurance Policy	2,629,000	3,162,000
Net increase in loans	(525,626,000)	(11,668,000)
Payments to Acquire Businesses, Net of Cash Acquired	0	(105,264,000)
Purchases of bank premises and equipment	(8,283,000)	(11,753,000)
Proceeds from the sale of bank premises and equipment	283,000	17,000
Payments on early termination of hedging relationship	(684,000)	0
Net cash used in investing activities	(450,362,000)	(13,942,000)
Cash flows provided by (used in) financing activities
Net increase (decrease) in time deposits	(336,289,000)	28,113,000
Net increase (decrease) in other deposits	2,040,615,000	(56,714,000)
Increase (Decrease) in Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Net	55,000,000	(177,046,000)
Increase Decrease in Federal Home Loan Bank Advances Long Term	(25,000,000)	(25,000,000)
Proceeds from Lines of Credit	0	49,980,000
Repayments of Lines of Credit	0	(49,980,000)
Repayments of Debt	(37,500,000)
Proceeds from (repayments of) long-term debt, net of issuance costs		74,867,000
RepaymentsOfJuniorSubordinatedDebt	0	(13,329,000)
Proceeds from Issuance of Subordinated Long-term Debt	0	49,526,000
Net Purchases from Stock Options Exercised	114,000
Net proceeds from exercise of stock options		(281,000)
Restricted stock awards issued, net of awards surrendered	(1,186,000)	(1,435,000)
Proceeds from shares issued under direct stock purchase plan	1,620,000	4,412,000
Payments for shares repurchased under share repurchase program	(95,091,000)	0
Common dividends paid	(45,681,000)	(38,152,000)
Net cash provided by (used in) financing activities	1,556,602,000	(154,477,000)
Net increase (decrease) in cash and cash equivalents	1,117,063,000	(31,183,000)
Cash and cash equivalents at beginning of year	150,974,000	250,455,000
Cash and cash equivalents at end of period	1,268,037,000	219,272,000
Supplemental schedule of noncash activities
Net increase in capital commitments relating to low income housing project investments	28,027,000	15,740,000
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	7,693,000	7,593,000
Stock Issued During Period, Value, Acquisitions	0	499,693,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	0	2,711,067,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	$ 0	$ 2,106,110,000