Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 18,611,000	$ 9,460,000
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	2,905,000	3,145,000
Provision (benefit) for loan losses	525,000	(500,000)
Deferred income tax expense	462,000	639,000
Net loss on sale of securities	29,000
Net gain on fixed assets		(2,000)
Loss on extinguishment of debt	437,000	122,000
Net (gain) loss on other real estate owned and foreclosed assets	(86,000)	666,000
Realized gain on sale leaseback transaction	(258,000)	(258,000)
Stock based compensation	865,000	739,000
Excess tax benefit related to equity award activity	(235,000)	(337,000)
Increase in cash surrender value of life insurance policies	(1,014,000)	(778,000)
Change in fair value on loans held for sale	(54,000)	(27,000)
Net change in:
Trading assets	(407,000)	(494,000)
Loans held for sale	(1,544,000)	(2,592,000)
Other assets	(30,455,000)	2,934,000
Increase (Decrease) in Other Operating Liabilities	11,762,000	(5,292,000)
Total adjustments	(17,068,000)	(2,035,000)
Net cash provided by operating activities	1,543,000	7,425,000
Cash flows provided by (used in) investing activities
Proceeds from sales of securities available for sale	266,000
Proceeds from maturities and principal repayments of securities available for sale	11,575,000	13,108,000
Purchases of securities available for sale	(16,469,000)	(5,846,000)
Proceeds from maturities and principal repayments of securities held to maturity	19,942,000	12,616,000
Purchases of securities held to maturity		(31,890,000)
Redemption of Federal Home Loan Bank stock	2,624,000
Investments in low income housing projects	(2,648,000)	(5,002,000)
Purchases of life insurance policies	(93,000)	(92,000)
Net (increase) decrease in loans	(40,895,000)	41,330,000
Cash used in business combinations, net of cash acquired	0	(13,448,000)
Purchases of bank premises and equipment	(2,750,000)	(1,481,000)
Proceeds from the sale of bank premises and equipment		14,000
Proceeds from the sale of other real estate owned and foreclosed assets	724,000	1,641,000
Net capital improvements to other real estate owned	(113,000)	(665,000)
Net cash provided by (used in) investing activities	(27,837,000)	10,285,000
Cash flows used in financing activities
Net decrease in time deposits	(27,633,000)	(19,023,000)
Net increase in other deposits	32,177,000	47,019,000
Net repayments of short-term Federal Home Loan Bank borrowings		(10,000,000)
Repayments of long-term Federal Home Loan Bank borrowings	(51,641,000)	(3,000,000)
Net increase (decrease) in customer repurchase agreements	610,000	(29,752,000)
Net increase in other short term borrowings		10,000,000
Repayments of subordinated debentures	0	(30,000,000)
Net proceeds from exercise of stock options	149,000	321,000
Restricted stock awards issued, net of awards surrendered	(671,000)	(635,000)
Excess tax benefit from stock based compensation	235,000	337,000
Tax benefit from deferred compensation distribution	179,000	165,000
Proceeds from shares issued under direct stock purchase plan	679,000	638,000
Common dividends paid	(6,823,000)	(5,760,000)
Net cash used in financing activities	(52,739,000)	(39,690,000)
Net decrease in cash and cash equivalents	(79,033,000)	(21,980,000)
Cash and cash equivalents at beginning of year	275,765,000	178,254,000
Cash and cash equivalents at end of period	196,732,000	156,274,000
Supplemental schedule of noncash investing and financing activities
Real Estate Owned, Transfer from Real Estate Owned	86,000	354,000
Net increase in capital commitments relating to low income housing project investments	37,000	0
Common stock issued for acquisition	$ 0	86,415,000
Fair value of assets acquired, net of cash acquired		598,376,000
Fair value of liabilities assumed		$ 498,513,000