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	$ 20,872	$ 18,882	$ 15,756
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan and lease losses	10,035	17,479	21,565
Depreciation of premises and equipment	2,925	2,591	2,517
Other-than-temporary impairment on equity securities	13	16	62
Net gain on sales of investment securities	(305)	(1,417)	(432)
Net gain on mortgage banking activities	(6,088)	(1,868)	(2,960)
Net loss on interest rate swap			1,072
Net (gain) loss on dispositions and sale of fixed assets	(1,257)	12	11
Net loss on sales and write-downs of other real estate owned	1,904	798	377
Bank owned life insurance income	(2,670)	(1,668)	(1,270)
Net amortization (accretion) on investment securities	2,470	641	(18)
Amortization, fair market value adjustments and capitalization of other intangibles	(597)	607	100
Stock-based compensation	1,267	888	1,045
Deferred tax expense (benefit)	2,540	1,613	(2,247)
Other adjustments to reconcile net income to cash provided by operating activities			(190)
Originations of loans held for sale	(325,569)	(176,503)	(170,266)
Proceeds from the sale of loans held for sale	329,569	179,414	170,098
Contributions to pension and other postretirement benefit plans	(8,215)	(2,325)	(2,139)
Decrease in accrued interest receivable and other assets	8,065	692	3,734
Increase (decrease) in accrued interest payable and other liabilities	2,180	2,846	(1,969)
Net cash provided by operating activities	37,139	42,698	34,846
Cash flows from investing activities:
Net cash paid due to acquisitions, net of cash acquired	(3,225)	(1,849)	(927)
Net capital expenditures	(578)	(2,301)	(2,932)
Proceeds from maturities and calls of securities held-to-maturity		32	72
Proceeds from maturities and calls of securities available-for-sale	164,943	212,964	287,035
Proceeds from sales of securities available-for-sale	57,186	40,481	13,466
Purchases of investment securities held-to-maturity	(24,697)	(45,952)
Purchases of investment securities available-for-sale	(226,429)	(201,025)	(352,989)
Purchases of lease financings			(4,816)
Net increase in loans and leases	(50,615)	(1,153)	(55,800)
Net decrease (increase) in interest-earning deposits	19,807	(49,957)	30,499
Proceeds from sales of other real estate owned	3,012	2,681	1,843
Purchases of bank owned life insurance		(12,500)
Proceeds from bank owned life insurance	2,415	791
Net cash used in investing activities	(58,181)	(57,788)	(84,549)
Cash flows from financing activities:
Net increase in deposits	116,101	62,962	122,013
Net decrease in short-term borrowings	(18,458)	(5,131)	(68,508)
Repayment of subordinated debt	(1,500)	(1,500)	(1,500)
Purchases of treasury stock	(2,319)	(1,928)	(153)
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs	2,515	2,287	2,189
Cash dividends paid	(16,755)	(13,367)	(13,249)
Net cash provided by financing activities	79,584	43,323	40,792
Net increase (decrease) in cash and due from banks	58,542	28,233	(8,911)
Cash and due from banks at beginning of year	39,857	11,624	20,535
Cash and due from banks at end of year	98,399	39,857	11,624
Cash paid during the year for:
Interest	8,701	11,202	21,202
Income taxes, net of refunds received	1,819	4,626	2,730
Noncash transactions:
Noncash transfer of loans to other real estate owned		7,426	1,205
Noncash transfer of loans held for investment to loans held for sale	2,599
Contingency consideration recorded as goodwill	$ 842