Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating Activities
Net income	$ 10,031	$ 9,614
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization and accretion	682	414
Provision for loan losses	1,950	1,086
Depreciation of premises and equipment	1,086	1,136
Deferred income tax expense (benefit)	211	(676)
Accretion of gain from sale of interest rate floors		(196)
Net periodic employee benefit cost	14	96
Realized investment securities losses	31
Stock-compensation expense	442	464
Increase in value of bank-owned life insurance	(692)	(782)
Change in accrued interest receivable	364	(885)
Change in other assets	1,202	3,468
Change in other liabilities	(3,731)	2,608
Net Cash Provided by Operating Activities	11,590	16,347
Investing Activities
Proceeds from sale of money market and mutual fund securities available-for-sale		208,300
Purchases of money market and mutual fund securities available-for-sale		(237,801)
Proceeds from sales of securities available-for-sale	5,336	291
Proceeds from maturities and calls of securities available-for-sale	24,822	32,591
Purchases of securities available-for-sale	(32,492)	(33,275)
Net decrease in loans	(1,854)	(5,472)
Purchases of premises and equipment	(1,971)	(473)
Net Cash Used in Investing Activities	(6,159)	(35,839)
Financing Activities
Net increase in noninterest-bearing deposits	34,267	6,635
Net increase in interest-bearing deposits	44,643	50,520
Net (decrease) increase in short-term borrowings	(75,226)	6,592
Purchases of treasury stock	(3,072)	(9,373)
Proceeds from exercise of stock options	488	153
Dividends paid	(5,171)	(5,273)
Net Cash (Used in) Provided by Financing Activities	(4,071)	49,254
Increase in Cash and Cash Equivalents	1,360	29,762
Cash and cash equivalents at beginning of period	146,399	66,379
Cash and Cash Equivalents at End of Period	$ 147,759	$ 96,141