Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 22,231	$ 21,189	$ 20,872
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan and lease losses	3,607	11,228	10,035
Depreciation of premises and equipment	3,243	2,927	2,903
Other-than-temporary impairment of equity securities	0	0	13
Net gain on sales of investment securities	(635)	(3,389)	(305)
Net gain on mortgage banking activities	(2,182)	(4,523)	(6,088)
Net (gain) loss on sales and dispositions of fixed assets	(40)	6	(1,257)
Net (gain) loss on sales and write-down of other real estate owned	(195)	(626)	1,904
Loss on termination of interest rate swap	0	1,866	0
Bank owned life insurance income	(1,628)	(2,968)	(2,670)
Net amortization on investment securities	1,690	2,729	2,470
Amortization, fair market value adjustments and capitalization of mortgage servicing rights	10	(1,367)	(1,413)
Stock-based compensation	1,141	978	1,267
Intangible expenses	2,167	157	899
Other adjustments to reconcile net income to cash provided by operating activities	(587)	(252)	0
Deferred tax expense	4,162	933	2,540
Originations of loans held for sale	(131,461)	(265,732)	(325,569)
Proceeds from the sale of loans held for sale	132,278	273,665	329,569
Contributions to pension and other postretirement benefit plans	(254)	(2,243)	(8,215)
(Increase) decrease in accrued interest receivable and other assets	(1,093)	(2,873)	8,065
(Decrease) increase in accrued interest payable and other liabilities	(587)	1,101	2,119
Net cash provided by operating activities	31,867	32,806	37,139
Cash flows from investing activities:
Net cash paid due to acquisitions	(9,260)	(2,170)	(3,225)
Net capital expenditures	(5,595)	(3,840)	(578)
Proceeds from maturities and calls of securities held-to-maturity	11,000	3,000	0
Proceeds from maturities and calls of securities available-for-sale	58,744	85,205	164,943
Proceeds from sales of securities available-for-sale	32,967	76,361	57,186
Purchases of investment securities held-to-maturity	0	0	(24,697)
Purchases of investment securities available-for-sale	(65,215)	(81,712)	(226,429)
Proceeds from sale of credit card portfolio	8,940	0	0
Net increase in loans and leases	(100,981)	(74,338)	(50,615)
Net decrease in interest-earning deposits	30,070	11,190	19,807
Proceeds from sales of other real estate owned	891	4,359	3,012
Proceeds from bank owned life insurance	0	3,540	2,415
Net cash (used in) provided by investing activities	(38,439)	21,595	(58,181)
Cash flows from financing activities:
Net increase (decrease) in deposits	16,843	(20,515)	116,101
Net increase (decrease) in short-term borrowings	4,217	(59,026)	(18,458)
Repayment of subordinated debt	0	(375)	(1,500)
Payment for repurchase of trust preferred securities	0	(20,619)	0
Payment of contingent consideration on acquisitions	(310)	0	0
Purchases of treasury stock	(4,605)	(12,012)	(2,319)
Stock issued under dividend reinvestment and employee stock purchase plans and other employee benefit programs	2,462	2,422	2,515
Proceeds from exercise of stock options	310	0	0
Cash dividends paid	(12,996)	(10,029)	(16,755)
Net cash provided by (used in) financing activities	5,921	(120,154)	79,584
Net (decrease) increase in cash and due from banks	(651)	(65,753)	58,542
Cash and due from banks at beginning of year	32,646	98,399	39,857
Cash and due from banks at end of period	31,995	32,646	98,399
Supplemental disclosures of cash flow information:
Cash paid for interest	4,118	5,997	8,701
Cash paid for income taxes, net of refunds received	5,899	5,352	1,819
Non cash transactions:
Transfer of loans to other real estate owned	0	3,485	0
Transfer of loans to loans held for sale	8,926	0	2,599
Contingent consideration recorded as goodwill	$ 6,105	$ 454	$ 842