CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash Flows From Operating Activities:
Net income	$ 19,457	$ 18,392	$ 13,463
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	4,061	3,973	4,285
Loss on loans held for sale	75	300	0
Deferred income tax provision (credit)	743	(612)	(72)
Depreciation and amortization	2,667	2,487	2,154
Premium amortization on investment securities, net	5,396	4,078	2,353
Net gains on sales of available-for-sale securities	(138)	(1,719)	(1,428)
Gain on sale of bank premises and equipment	0	(154)	0
Stock-based compensation expense	756	647	681
Accretion of cash surrender value on bank-owned life insurance	(502)	(496)	(517)
Decrease (increase) in prepaid FDIC assessment	1,022	1,539	(5,331)
Pension plan contribution in excess of expense	(3,436)	(2,800)	(1,169)
Increase in other assets	(1,979)	(350)	(1,782)
Increase (decrease) in accrued expenses and other liabilities	1,439	1,326	(1,764)
Net cash provided by operating activities	29,561	26,611	10,873
Cash Flows From Investing Activities:
Proceeds from sales of available-for-sale securities	4,610	78,504	50,697
Proceeds from maturities and redemptions of investment securities:
Held-to-maturity	25,073	43,103	42,608
Available-for-sale	122,620	141,973	147,347
Purchase of investment securities:
Held-to-maturity	(472)	(596)	(2,068)
Available-for-sale	(338,586)	(245,031)	(452,851)
Proceeds from sales of loans held for sale	1,535	0	0
Net increase in loans to customers	(85,013)	(76,898)	(169,547)
Net decrease (increase) in restricted stock	(4,129)	194	(1,683)
Purchase of bank premises and equipment, net	(3,634)	(5,086)	(7,651)
Net cash used in investing activities	(277,996)	(63,837)	(393,148)
Cash Flows From Financing Activities:
Net increase in total deposits	209,930	15,388	377,213
Net increase (decrease) in short-term borrowings	40,637	(49,817)	(12,715)
Proceeds from long-term debt	27,500	30,000	35,000
Repayment of long-term debt	(12,000)	0	0
Proceeds from issuance of common stock	0	32,362	0
Proceeds from exercise of stock options	1,279	676	901
Tax benefit of stock compensation plans	139	39	66
Repurchase and retirement of common stock	(185)	(91)	(957)
Cash dividends paid	(7,790)	(6,253)	(5,329)
Net cash provided by financing activities	259,510	22,304	394,179
Net increase (decrease) in cash and cash equivalents	11,075	(14,922)	11,904
Cash and cash equivalents, beginning of year	18,420	33,342	21,438
Cash and cash equivalents, end of year	29,495	18,420	33,342
Cash paid for:
Interest	16,397	15,767	17,365
Income taxes	4,116	6,178	3,377
Noncash investing and financing activities:
Cash dividends payable	2,022	1,916	1,443
Loans transferred from portfolio to held for sale	$ 610	$ 1,300	$ 0