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	$ 24,033us-gaap_NetIncomeLoss	$ 23,497us-gaap_NetIncomeLoss	$ 23,303us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8,181	7,346	6,916
Net gains on sales of securities	(23)us-gaap_GainLossOnSaleOfSecuritiesNet	(4,024)us-gaap_GainLossOnSaleOfSecuritiesNet	(2,635)us-gaap_GainLossOnSaleOfSecuritiesNet
Stock-based compensation expense	2,041us-gaap_ShareBasedCompensation	1,975us-gaap_ShareBasedCompensation	1,399us-gaap_ShareBasedCompensation
Provisions for loan losses		500us-gaap_ProvisionForLoanLossesExpensed	2,400us-gaap_ProvisionForLoanLossesExpensed
Deferred income tax (benefit) expense	(679)us-gaap_DeferredIncomeTaxExpenseBenefit	57us-gaap_DeferredIncomeTaxExpenseBenefit	974us-gaap_DeferredIncomeTaxExpenseBenefit
Increase (decrease) in income tax liability	34	(964)	1,073
Increase (decrease) in pension liability	2,282	2,822	(2,158)
Other operating activities, net	(1,026)	(2,323)	4,056
Net cash provided by operating activities	34,843	28,886	35,328
Cash Flows From Investing Activities:
Proceeds from sales of securities available-for-sale	587	95,742	69,747
Proceeds from maturities of securities available-for-sale	18,340	18,117	11,898
Purchase of securities available-for-sale	(54,054)	(104,351)	(114,646)
Net (increase) decrease in loans	(16,954)	34,378	(19,165)
Increase in payments in excess of funding	(42,577)	(14,128)	(2,144)
Purchases of premises and equipment, net	(6,291)	(4,857)	(3,099)
Environmental management acquisition			(7,798)
Net cash (used in) provided by investing activities	(100,949)	24,901	(65,207)
Cash Flows From Financing Activities:
Net increase (decrease) in noninterest-bearing demand deposits	15,158	(302)	12,187
Net increase in interest-bearing demand and savings deposits	39,766	32,645	21,683
Net decrease in time deposits	(19,221)us-gaap_IncreaseDecreaseInTimeDeposits	(13,555)us-gaap_IncreaseDecreaseInTimeDeposits	(18,530)us-gaap_IncreaseDecreaseInTimeDeposits
Net increase (decrease) in accounts and drafts payable	111,475	21,192	(72,440)
Cash dividends paid	(9,337)us-gaap_PaymentsOfDividendsCommonStock	(8,510)us-gaap_PaymentsOfDividendsCommonStock	(7,361)us-gaap_PaymentsOfDividendsCommonStock
Purchase of common shares for treasury	(1,848)
Other financing activities, net	(814)	(1,083)	(534)
Net cash (used in) provided by financing activities	135,179	30,387	(64,995)
Net increase (decrease) in cash and cash equivalents	69,073	84,174	(94,874)
Cash and cash equivalents at beginning of year	225,262	141,088	235,962
Cash and cash equivalents at end of year	294,335	225,262	141,088
Supplemental information:
Cash paid for interest	2,491us-gaap_InterestPaidNet	2,855us-gaap_InterestPaidNet	3,196us-gaap_InterestPaidNet
Cash paid for income taxes	$ 8,476us-gaap_IncomeTaxesPaidNet	$ 8,265us-gaap_IncomeTaxesPaidNet	$ 6,407us-gaap_IncomeTaxesPaidNet

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- Definition

The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

+ Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration

- Definition

The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

- Definition

Amount of expense related to loss from loan transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 11

-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.11)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

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Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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