Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 27,555,000	$ 20,725,000
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	4,181,000	3,557,000
Provision for loan losses	500,000	600,000
Deferred income tax expense	359,000	709,000
Unrealized Gain (Loss) on Investments	485,000
Net gain on sale of securities		(1,000)
Net (gain) loss on bank premises and equipment	(7,000)	4,000
Net (gain) loss on other real estate owned and foreclosed assets	1,000	(29,000)
Realized gain on sale leaseback transaction	(258,000)	(258,000)
Stock based compensation	1,041,000	643,000
Increase in cash surrender value of life insurance policies	(947,000)	(964,000)
Net change in:
Trading assets	(277,000)	(485,000)
Loans held for sale	805,000	2,594,000
Change in Fair Value on Loans Held for Sale	26,000	147,000
Other assets	2,594,000	18,384,000
Increase (Decrease) in Other Operating Liabilities	(2,175,000)	(8,192,000)
Total adjustments	6,328,000	16,709,000
Net cash provided by operating activities	33,883,000	37,434,000
Payments to Acquire Trading Securities Held-for-investment	(78,000)
Payments to Acquire Available-for-sale Securities, Equity		0
Cash flows used in investing activities
Proceeds from sales of securities available for sale		16,000
Proceeds from maturities and principal repayments of securities available for sale	11,040,000	12,107,000
Purchases of securities available for sale	(37,201,000)	(49,617,000)
Proceeds from maturities and principal repayments of securities held to maturity	22,888,000	19,101,000
Purchases of securities held to maturity	(53,995,000)	(34,090,000)
Net purchases of Federal Home Loan Bank stock	(1,430,000)	0
Investments in low income housing projects	(1,213,000)	(3,437,000)
Purchases of life insurance policies	(93,000)	(93,000)
Net increase in loans	(6,856,000)	(64,997,000)
Purchases of bank premises and equipment	(2,803,000)	(5,457,000)
Proceeds from the sale of bank premises and equipment	52,000	27,000
Proceeds from the sale of other real estate owned and foreclosed assets	253,000	1,255,000
Net cash used in investing activities	(69,436,000)	(125,185,000)
Cash flows provided by financing activities
Net increase (decrease) in time deposits	10,486,000	(33,219,000)
Net increase in other deposits	11,804,000	91,721,000
Net decrease in customer repurchase agreements	(24,765,000)	(31,141,000)
Net proceeds from exercise of stock options	143,000	143,000
Restricted stock awards issued, net of awards surrendered	(1,318,000)	(1,336,000)
Proceeds from shares issued under direct stock purchase plan	419,000	393,000
Common dividends paid	(8,784,000)	(7,832,000)
Net cash provided by (used in) financing activities	(12,015,000)	18,729,000
Net decrease in cash and cash equivalents	(47,568,000)	(69,022,000)
Cash and cash equivalents at beginning of year	213,116,000	289,095,000
Cash and cash equivalents at end of period	165,548,000	220,073,000
Supplemental schedule of noncash investing and financing activities
Real Estate Owned, Transfer from Real Estate Owned		457,000
Net increase in capital commitments relating to low income housing project investments	$ 9,000	$ 60,000