Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 117,698,000	$ 91,688,000
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	13,919,000	11,696,000
Change In Unamortized Net Loan Costs And Premiums	(7,262,000)	392,000
Provision for loan losses	2,000,000	3,575,000
Deferred income tax expense	171,000	176,000
Net unrealized (gain) loss on equity securities	(1,562,000)	107,000
Gain (Loss) on Investments	1,462,000
Net loss on bank premises and equipment	180,000	8,000
Net loss on other real estate owned and foreclosed assets	389,000	1,000
Realized gain on sale leaseback transaction	(433,000)	(585,000)
Stock based compensation	3,413,000	3,161,000
Increase in cash surrender value of life insurance policies	(3,572,000)	(2,929,000)
Gain Realized on Life Insurance Policies	(434,000)	(1,463,000)
Operating Lease, Payments	(7,798,000)	0
Change in Fair Value on Loans Held for Sale	(1,192,000)	(147,000)
Net change in:
Trading assets	(459,000)	(257,000)
Loans held for sale	37,672,000	(5,516,000)
Other assets	(57,624,000)	(12,179,000)
Increase (Decrease) in Other Operating Liabilities	40,668,000	16,066,000
Total adjustments	19,538,000	12,106,000
Net cash provided by operating activities	137,236,000	103,794,000
Cash flows used in investing activities
Proceeds from Sale of Debt and Equity Securities, FV-NI, Held-for-investment	1,461,000	30,000
Increase (Decrease) in Equity Securities, FV-NI	(356,000)	(305,000)
Proceeds from Sale of Debt Securities, Available-for-sale	45,863,000
Proceeds from maturities and principal repayments of securities available for sale	35,770,000	41,964,000
Payments to Acquire Debt Securities, Available-for-sale	(16,230,000)	(63,844,000)
Proceeds from maturities and principal repayments of securities held to maturity	87,313,000	62,650,000
Purchases of securities held to maturity	(56,937,000)	(118,256,000)
Net redemption (purchases) of Federal Home Loan Bank stock	18,344,000	(1,510,000)
Investments in low income housing projects	(3,549,000)	(2,598,000)
Purchases of life insurance policies	(115,000)	(116,000)
Proceeds from Life Insurance Policy	3,162,000	2,850,000
Net increase in loans	(11,668,000)	(173,224,000)
Payments to Acquire Businesses, Net of Cash Acquired	(105,264,000)	0
Purchases of bank premises and equipment	(11,753,000)	(8,123,000)
Proceeds from the sale of bank premises and equipment	17,000	96,000
Proceeds from the sale of other real estate owned and foreclosed assets		308,000
Net cash used in investing activities	(13,942,000)	(260,078,000)
Cash flows provided by (used in) financing activities
Net increase in time deposits	28,113,000	19,226,000
Net increase (decrease) in other deposits	(56,714,000)	227,836,000
Increase (Decrease) in Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Net	(177,046,000)
Increase Decrease in Federal Home Loan Bank Advances Long Term	(25,000,000)	(2,475,000)
Net decrease in customer repurchase agreements		(21,503,000)
Proceeds from Lines of Credit	49,980,000	0
Repayments of Lines of Credit	(49,980,000)	0
Proceeds from Debt, Net of Issuance Costs	74,867,000	0
Repayments of Subordinated Debt	(13,329,000)	0
Proceeds from Issuance of Subordinated Long-term Debt	49,526,000	0
Net proceeds from exercise of stock options	(281,000)	(184,000)
Restricted stock awards issued, net of awards surrendered	(1,435,000)	(1,344,000)
Proceeds from shares issued under direct stock purchase plan	4,412,000	1,792,000
Common dividends paid	(38,152,000)	(29,701,000)
Net cash provided by (used in) financing activities	(154,477,000)	194,015,000
Net increase (decrease) in cash and cash equivalents	(31,183,000)	37,731,000
Cash and cash equivalents at beginning of year	250,455,000	213,116,000
Cash and cash equivalents at end of period	219,272,000	250,847,000
Supplemental schedule of noncash activities
Net increase in capital commitments relating to low income housing project investments	15,740,000	65,000
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	7,593,000	0
Operating Lease, Right-of-Use Asset	51,800,000
Operating Lease, Liability	53,441,000
Stock Issued During Period, Value, Acquisitions	$ 499,693,000	0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		$ 0