CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash Flows From Operating Activities:
Net income	$ 20,393	$ 19,457	$ 18,392
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	3,628	4,061	3,973
Loss (gains) on loans held-for-sale	(28)	75	300
Deferred income tax provision (credit)	2,835	743	(612)
Depreciation and amortization	2,816	2,667	2,487
Premium amortization on investment securities, net	8,981	5,396	4,078
Net gains on sales of available-for-sale securities	(3,613)	(138)	(1,719)
Loss on extinguishment of debt	3,812	0	0
Gain on sale of bank premises and equipment	0	0	(154)
Stock-based compensation expense	782	756	647
Accretion of cash surrender value on bank-owned life insurance	(500)	(502)	(496)
Decrease in prepaid FDIC assessment	915	1,022	1,539
Pension plan contribution in excess of expense	(5,328)	(3,436)	(2,800)
Increase in other assets	(227)	(1,979)	(350)
Increase in accrued expenses and other liabilities	555	1,439	1,326
Net cash provided by operating activities	35,021	29,561	26,611
Cash Flows From Investing Activities:
Proceeds from sales of available-for-sale securities	102,687	4,610	78,504
Proceeds from maturities and redemptions of investment securities:
Held-to-maturity	18,427	25,073	43,103
Available-for-sale	136,518	122,620	141,973
Purchase of investment securities:
Held-to-maturity	(400)	(472)	(596)
Available-for-sale	(169,171)	(338,586)	(245,031)
Proceeds from sales of loans held-for-sale	928	1,535	0
Net increase in loans to customers	(164,000)	(85,013)	(76,898)
Net decrease (increase) in restricted stock	(820)	(4,129)	194
Purchase of bank premises and equipment, net	(5,570)	(3,634)	(5,086)
Net cash used in investing activities	(81,401)	(277,996)	(63,837)
Cash Flows From Financing Activities:
Net increase in total deposits	130,208	209,930	15,388
Net increase (decrease) in short-term borrowings	1,407	40,637	(49,817)
Proceeds from long-term debt	62,500	27,500	30,000
Repayment of long-term debt	(128,812)	(12,000)	0
Proceeds from issuance of common stock	2,006	0	32,362
Proceeds from exercise of stock options	2,603	1,279	676
Tax benefit of stock compensation plans	135	139	39
Repurchase and retirement of common stock	(369)	(185)	(91)
Cash dividends paid	(10,602)	(7,790)	(6,253)
Net cash provided by financing activities	59,076	259,510	22,304
Net increase (decrease) in cash and cash equivalents	12,696	11,075	(14,922)
Cash and cash equivalents, beginning of year	29,495	18,420	33,342
Cash and cash equivalents, end of year	42,191	29,495	18,420
Cash paid for:
Interest	15,378	16,397	15,767
Income taxes	2,874	4,116	6,178
Noncash investing and financing activities:
Cash dividends payable	0	2,022	1,916
Loans transferred from portfolio to held-for-sale	$ 900	$ 610	$ 1,300