Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 12,252	$ 12,183
Adjustments to reconcile net income to cash provided by operating activities
Depreciation and amortization	2,064	2,589
Provision for loan losses	1,300	1,600
Deferred income tax expense (benefit)	2	(9)
Loss (gain) on sale of fixed assets	28	(9)
Loss on sale of other real estate owned and foreclosed assets	198	95
Gain realized from early termination of hedging relationship		(22)
Realized gain on sale leaseback transaction	(258)	(258)
Stock based compensation	760	853
Increase in cash surrender value of life insurance policies	(746)	(713)
Change in fair value on loans held for sale	140	269
Net change in:
Trading assets		(265)
Loans held for sale	11,257	(2,615)
Other assets	10,924	3,835
Other liabilities	(11,862)	(8,369)
Total adjustments	13,807	(3,019)
Net cash provided by operating activities	26,059	9,164
Cash flows used in investing activities
Proceeds from maturities and principal repayments of securities available for sale	26,708	23,079
Purchase of securities available for sale	(34,725)	(71,765)
Proceeds from maturities and principal repayments of securities held to maturity	13,950	13,728
Purchase of securities held to maturity	(44,902)	(9,975)
Redemption of Federal Home Loan Bank stock	3,093	2,290
Purchase of life insurance policies	(93)	(95)
Net decrease (increase) in loans	29,167	(78,900)
Purchase of bank premises and equipment	(1,478)	(2,762)
Proceeds from the sale of bank premises and equipment		11
Proceeds resulting from early termination of hedging relationship		22
Proceeds from the sale of other real estate owned and foreclosed assets	1,206	1,492
Net cash used in investing activities	(7,074)	(122,875)
Cash flows provided by financing activities
Net increase (decrease) in time deposits	15,141	(5,250)
Net (decrease) increase in other deposits	(10,408)	74,134
Net decrease in wholesale and customer repurchase agreements	(23,741)	(18,450)
Net decrease in short term Federal Home Loan Bank advances	(15,829)	(35,000)
Proceeds from exercise of stock options	451	439
Tax benefit from stock option exercises	166	69
Restricted shares surrendered	(507)	(229)
Tax benefit from deferred compensation distribution	100	86
Shares issued under direct stock purchase plan	8	285
Common dividends paid		(4,085)
Net cash (used in) provided by financing activities	(34,619)	11,999
Net decrease in cash and cash equivalents	(15,634)	(101,712)
Cash and cash equivalents at beginning of year		215,474
Supplemental schedule of noncash investing and financing activities
Transfer of loans to foreclosed assets	771	1,503
Transfer of securities from trading to available for sale		$ 8,505