Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 20,725,000	$ 18,611,000
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	3,557,000	2,905,000
Provision for loan losses	600,000	525,000
Deferred income tax expense	709,000	462,000
Net (gain) loss on sale of securities	(1,000)	29,000
Net loss on bank premises and equipment	4,000
Loss on extinguishment of debt	0	437,000
Net gain on other real estate owned and foreclosed assets	(29,000)	(86,000)
Realized gain on sale leaseback transaction	(258,000)	(258,000)
Stock based compensation	643,000	865,000
Excess tax benefit related to equity award activity	0	(235,000)
Increase in cash surrender value of life insurance policies	(964,000)	(1,014,000)
Change in fair value on loans held for sale	147,000	(54,000)	$ (87,000)
Net change in:
Trading assets	(485,000)	(407,000)
Loans held for sale	2,594,000	(1,544,000)
Other assets	18,384,000	(30,455,000)
Increase (Decrease) in Other Operating Liabilities	(8,192,000)	11,762,000
Total adjustments	16,709,000	(17,068,000)
Net cash provided by operating activities	37,434,000	1,543,000
Cash flows used in investing activities
Proceeds from sales of securities available for sale	16,000	266,000
Proceeds from maturities and principal repayments of securities available for sale	12,107,000	11,575,000
Purchases of securities available for sale	(49,617,000)	(16,469,000)
Proceeds from maturities and principal repayments of securities held to maturity	19,101,000	19,942,000
Purchases of securities held to maturity	(34,090,000)
Redemption of Federal Home Loan Bank stock		2,624,000
Investments in low income housing projects	(3,437,000)	(2,648,000)
Purchases of life insurance policies	(93,000)	(93,000)
Net increase in loans	(64,997,000)	(40,895,000)
Purchases of bank premises and equipment	(5,457,000)	(2,750,000)
Proceeds from the sale of bank premises and equipment	27,000
Proceeds from the sale of other real estate owned and foreclosed assets	1,255,000	724,000
Net payments relating to other real estate owned and foreclosed assets	0	(113,000)
Net cash used in investing activities	(125,185,000)	(27,837,000)
Cash flows provided by (used in) financing activities
Net decrease in time deposits	(33,219,000)	(27,633,000)
Net increase in other deposits	91,721,000	32,177,000
Repayments of long-term Federal Home Loan Bank borrowings	0	(51,641,000)
Net increase (decrease) in customer repurchase agreements	(31,141,000)	610,000
Net proceeds from exercise of stock options	143,000	149,000
Restricted stock awards issued, net of awards surrendered	(1,336,000)	(671,000)
Excess tax benefit from stock based compensation		235,000
Tax benefit from deferred compensation distribution		179,000
Proceeds from shares issued under direct stock purchase plan	393,000	679,000
Common dividends paid	(7,832,000)	(6,823,000)
Net cash provided by (used in) financing activities	18,729,000	(52,739,000)
Net decrease in cash and cash equivalents	(69,022,000)	(79,033,000)
Cash and cash equivalents at beginning of year	289,095,000	275,765,000	275,765,000
Cash and cash equivalents at end of period	220,073,000	196,732,000	$ 289,095,000
Supplemental schedule of noncash investing and financing activities
Real Estate Owned, Transfer from Real Estate Owned	457,000	86,000
Net increase in capital commitments relating to low income housing project investments	$ 60,000	$ 37,000