S&T Bancorp (STBA) 10-Q 7 Aug 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Jul. 31, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Jun-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Entity Registrant Name	'S&T BANCORP INC	'
Entity Central Index Key	'0000719220	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	29,796,397

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS	'	'
Cash and due from banks, including interest-bearing deposits of $54,575 and $53,594 at June 30, 2014 and December 31, 2013, respectively	$130,235	$108,356
Securities available-for-sale, at fair value	588,488	509,425
Loans held for sale	3,102	2,136
Portfolio loans, net of unearned income	3,725,079	3,566,199
Allowance for loan losses	-46,580	-46,255
Portfolio loans, net	3,678,499	3,519,944
Bank owned life insurance	61,348	60,480
Premises and equipment, net	36,665	36,615
Federal Home Loan Bank and other restricted stock, at cost	15,818	13,629
Goodwill	175,820	175,820
Other intangible assets, net	3,146	3,759
Other assets	94,909	103,026
Total Assets	4,788,030	4,533,190
LIABILITIES	'	'
Noninterest-bearing demand	1,089,999	992,779
Interest-bearing demand	307,897	312,790
Money market	301,719	281,403
Savings	1,024,050	994,805
Certificates of deposit	1,141,581	1,090,531
Total Deposits	3,865,246	3,672,308
Securities sold under repurchase agreements	25,269	33,847
Short-term borrowings	185,000	140,000
Long-term borrowings	20,636	21,810
Junior subordinated debt securities	45,619	45,619
Other liabilities	49,073	48,300
Total Liabilities	4,190,843	3,961,884
SHAREHOLDERS' EQUITY	'	'
Common stock ($2.50 par value) Authorized—50,000,000 shares Issued—31,197,365 shares at June 30, 2014 and December 31, 2013 Outstanding—29,797,204 shares at June 30, 2014 and 29,737,725 shares at December 31, 2013	77,993	77,993
Additional paid-in capital	78,570	78,140
Retained earnings	485,277	468,158
Accumulated other comprehensive income (loss)	-6,026	-12,694
Treasury stock 1,400,161 shares at June 30, 2014 and 1,459,640 shares at December 31, 2013, (at cost)	-38,627	-40,291
Total Shareholders’ Equity	597,187	571,306
Total Liabilities and Shareholders’ Equity	$4,788,030	$4,533,190

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Cash and due from banks, interest-bearing amounts	$54,575	$53,594
Common stock, par value (in dollars per share)	$2.50	$2.50
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	31,197,365	31,197,365
Common stock, shares outstanding	29,797,204	29,737,725
Treasury stock, shares	1,400,161	1,459,640

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
INTEREST INCOME	'	'	'	'
Loans, including fees	$36,614	$35,765	$72,263	$70,810
Investment securities:	'	'	'	'
Taxable	2,184	1,879	4,167	3,742
Tax-exempt	979	815	1,908	1,648
Dividends	95	94	199	196
Total Interest Income	39,872	38,553	78,537	76,396
INTEREST EXPENSE	'	'	'	'
Deposits	2,476	2,951	4,986	6,153
Borrowings and junior subordinated debt securities	541	1,006	1,105	1,978
Total Interest Expense	3,017	3,957	6,091	8,131
NET INTEREST INCOME	36,855	34,596	72,446	68,265
Provision for loan losses	-1,134	1,023	-845	3,330
Net Interest Income After Provision for Loan Losses	37,989	33,573	73,291	64,935
NONINTEREST INCOME	'	'	'	'
Securities gains, net	40	0	41	2
Wealth management fees	2,837	2,820	5,792	5,396
Debit and credit card fees	2,724	3,150	5,226	5,601
Service charges on deposit accounts	2,574	2,495	5,083	4,943
Insurance fees	1,425	1,643	3,102	3,418
Mortgage banking	264	911	396	1,393
Gain on sale of merchant card servicing business	0	0	0	3,093
Other	1,907	1,848	3,547	3,827
Total Noninterest Income	11,771	12,867	23,187	27,673
NONINTEREST EXPENSE	'	'	'	'
Salaries and employee benefits	15,772	14,725	31,148	30,792
Data processing	2,219	2,137	4,314	4,801
Net occupancy	1,984	1,958	4,214	4,127
Furniture and equipment	1,277	1,230	2,548	2,538
Marketing	960	793	1,578	1,482
Other taxes	893	915	1,524	1,914
Professional services and legal	875	1,171	1,538	2,145
FDIC insurance	579	707	1,210	1,483
Other	5,606	4,750	11,005	10,720
Total Noninterest Expense	30,165	28,386	59,079	60,002
Income Before Taxes	19,595	18,054	37,399	32,606
Provision for income taxes	4,875	3,951	8,646	6,173
Net Income	14,720	14,103	28,753	26,433
Earnings per share—basic (in dollars per share)	$0.49	$0.47	$0.97	$0.89
Earnings per share—diluted (in dollars per share)	$0.49	$0.47	$0.97	$0.89
Dividends declared per share (in dollars per share)	$0.17	$0.15	$0.33	$0.30
Comprehensive Income	$18,343	$6,651	$35,421	$18,220

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Shareholders' Equity (USD $)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
In Thousands, unless otherwise specified
Balance at Dec. 31, 2012	$537,422	$77,993	$77,458	$436,039	($13,582)	($40,486)
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'
Net income	26,433	'	'	26,433	'	'
Other comprehensive income (loss), net of tax	-8,213	'	'	'	-8,213	'
Cash dividends declared	-8,918	'	'	-8,918	'	'
Treasury stock issued for restricted awards	-86	'	'	-296	'	210
Recognition of restricted stock compensation expense	261	'	261	'	'	'
Tax expense from stock-based compensation	-47	'	-47	'	'	'
Balance at Jun. 30, 2013	546,852	77,993	77,672	453,258	-21,795	-40,276
Balance at Dec. 31, 2013	571,306	77,993	78,140	468,158	-12,694	-40,291
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'
Net income	28,753	'	'	28,753	'	'
Other comprehensive income (loss), net of tax	6,668	'	'	'	6,668	'
Cash dividends declared	-9,810	'	'	-9,810	'	'
Treasury stock issued for restricted awards	-160	'	'	-1,824	'	1,664
Recognition of restricted stock compensation expense	430	'	430	'	'	'
Tax expense from stock-based compensation	0	'	0	'	'	'
Balance at Jun. 30, 2014	$597,187	$77,993	$78,570	$485,277	($6,026)	($38,627)

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Dividends declared per share (in dollars per share)	$0.33	$0.30
Treasury stock issued for restricted awards, net of forfeitures	80,455	22,189
Forfeitures of restricted stock, shares	20,976	16,093
Retained Earnings [Member]	'	'
Dividends declared per share (in dollars per share)	$0.33	$0.30
Treasury stock issued for restricted awards, net of forfeitures	80,455	22,189
Forfeitures of restricted stock, shares	20,976	16,093
Treasury Stock [Member]	'	'
Treasury stock issued for restricted awards, net of forfeitures	80,455	22,189
Forfeitures of restricted stock, shares	20,976	16,093

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
OPERATING ACTIVITIES	'	'
Net income	$28,753	$26,433
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Provision for loan losses	-845	3,330
Provision for unfunded loan commitments	182	302
Depreciation and amortization	2,309	3,061
Net amortization of discounts and premiums	1,898	1,776
Stock-based compensation expense	395	254
Securities gains, net	-41	-2
Net gain on sale of merchant card servicing business	0	-3,093
Tax expense from stock-based compensation	0	47
Mortgage loans originated for sale	-13,057	-37,706
Proceeds from the sale of loans	13,475	57,667
Gain on the sale of loans, net	-85	-647
Net increase in interest receivable	-243	-1,222
Net decrease in interest payable	-186	-1,241
Net decrease in other assets	10,016	17,243
Net increase (decrease) in other liabilities	1,199	-20,981
Net Cash Provided by Operating Activities	43,770	45,221
INVESTING ACTIVITIES	'	'
Purchases of securities available-for-sale	-108,845	-66,495
Proceeds from maturities, prepayments and calls of securities available-for-sale	36,343	23,240
Proceeds from sales of securities available-for-sale	1,418	94
Net (payments for) proceeds from Federal Home Loan Bank stock	-2,189	1,356
Net increase in loans	-169,209	-103,846
Proceeds from sale of loans not originated for resale	4,108	0
Purchases of premises and equipment	-1,719	-1,400
Proceeds from the sale of premises and equipment	64	576
Proceeds from the sale of merchant card servicing business	0	4,750
Net Cash Used in Investing Activities	-240,029	-141,725
FINANCING ACTIVITIES	'	'
Net increase (decrease) in core deposits	141,888	-26,999
Net increase in certificates of deposit	50,972	36,842
Net (decrease) increase in securities sold under repurchase agreements	-8,578	11,569
Net increase in short-term borrowings	45,000	50,000
Repayments of long-term borrowings	-1,174	-11,136
Repayment of junior subordinated debt	0	-45,000
Treasury shares purchased-net	-160	-86
Cash dividends paid to common shareholders	-9,810	-8,918
Tax expense from stock-based compensation	0	-47
Net Cash Provided by Financing Activities	218,138	6,225
Net increase (decrease) in cash and cash equivalents	21,879	-90,279
Cash and cash equivalents at beginning of period	108,356	337,711
Cash and Cash Equivalents at End of Period	130,235	247,432
Supplemental Disclosures	'	'
Loans transferred to held for sale	1,300	0
Interest paid	6,278	9,372
Income taxes paid, net of refunds	8,400	5,155
Transfers of loans to other real estate owned	$274	$180

Basis_of_Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Basis of Presentation	'
	BASIS OF PRESENTATION
	Principles of Consolidation
	The interim Consolidated Financial Statements include the accounts of S&T Bancorp, Inc., or S&T, and its wholly owned subsidiaries. All significant intercompany transactions have been eliminated in consolidation. Investments of 20 percent to 50 percent of the outstanding common stock of investees are accounted for using the equity method of accounting.
	Basis of Presentation
	The accompanying unaudited interim Consolidated Financial Statements of S&T have been prepared in accordance with generally accepted accounting principles, or GAAP, in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our annual report on Form 10-K for the year ended December 31, 2013, filed with the Securities and Exchange Commission, or SEC, on February 21, 2014. In the opinion of management, the accompanying interim financial information reflects all adjustments, including normal recurring adjustments, necessary to present fairly our financial position and the results of operations for each of the interim periods presented. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year or any future period.
	Reclassification
	Certain amounts in the prior periods’ financial statements and footnotes have been reclassified to conform to the current period’s presentation. The reclassifications had no significant effect on our results of operations or financial condition.
	Use of Estimates
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates.
	Recently Adopted Accounting Standards Updates, or ASU
	Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Tax Credit Carry forward Exists
	In July 2013, the Financial Accounting Standards Board (FASB) issued ASU No. 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Tax Credit Carry forward Exists. The ASU requires that entities should present an unrecognized tax benefit as a reduction of the deferred tax asset for a net operating loss, or NOL, or similar tax loss or tax credit carry forward rather than as a liability when the uncertain tax position would reduce the NOL or other carry forward under the tax law. The new standard is effective for fiscal years, and interim periods within those years, beginning after December 15, 2013, and should be applied prospectively to all unrecognized tax benefits that exist at the effective date. Retrospective application is permitted. The adoption of this ASU had no impact on our results of operations or financial position.
	Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation is Fixed at the Reporting Date
	In February 2013, the FASB issued ASU No. 2013-04, Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation is Fixed at the Reporting Date. The ASU requires the measurement of obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date as the sum of the amount the reporting entity agreed to pay on the basis of its arrangement with its co-obligors as well as any additional amount that the entity expects to pay on behalf of its co-obligors. The new standard is effective retrospectively for fiscal years and interim periods within those years, beginning after December 15, 2013, and early adoption is permitted. The adoption of this ASU had no impact on our results of operations or financial position.
	Recently Issued Accounting Standards Updates not yet Adopted
	Share-Based Payment Awards with Performance Targets
	In June 2014, the FASB issued ASU No. 2014-12, Share-Based Payment Awards with Performance Targets. The main provisions of ASU 2014-12 require that a performance target included in a share-based payment award that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. Therefore, under the existing stock compensation guidance in Topic 718, the performance target should not be reflected in estimating the grant-date fair value of the award. The standard is effective for annual periods and interim periods beginning after December 15, 2015. We do not expect that this ASU will have a material impact on our results of operations or financial position.
	Repurchase-To-Maturity Transactions, Repurchase Financings and New Disclosures
	In June 2014, the FASB issued ASU No. 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and New Disclosures to change the accounting for repurchase-to-maturity transactions and certain linked repurchase financings. This will result in accounting for both types of arrangements as secured borrowings on the balance sheet and require new disclosures to (i) increase transparency about the types of collateral pledged in secured borrowing transactions and (ii) enable users to better understand transactions in which the transferor retains substantially all of the exposure to the economic return on the transferred financial asset throughout the term of the transaction. The disclosure for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014, and for interim periods beginning after March 15, 2015. All other accounting and disclosure amendments in the ASU are effective for the first interim or annual period beginning after December 15, 2014. Earlier application for a public business entity is prohibited. We do not expect that this ASU will have a material impact on our results of operations or financial position.
	Revenues from Contracts with Customers
	In May 2014, the FASB issued ASU No. 2014-09, Revenues from Contracts with Customers. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. The standard is required to be adopted by public business entities in annual periods beginning on or after December 15, 2016. The provisions do not apply to lease contracts, insurance contracts, financial instruments and other contractual rights or obligations (e.g. receivables, debt and equity securities, liabilities, debt, derivatives transfers, and servicing, etc.), guarantees, or non-monetary exchanges between entities. We are currently evaluating the impact of the adoption of this pronouncement on our consolidated financial statements.
	Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity
	In April 2014, the FASB issued ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, which changes the criteria for determining which disposals can be presented as discontinued operations and modifies related disclosure requirements. The guidance applies to all entities that dispose of components. It will significantly change current practices for assessing discontinued operations and affect an entity’s income and earnings per share from continuing operations. An entity is required to reclassify assets and liabilities of a discontinued operation that are classified as held for sale or disposed of in the current period for all comparative periods presented. The ASU requires that an entity present in the statement of cash flows or disclose in a note either total operating and investing cash flows for discontinued operations, or depreciation, amortization, capital expenditures and significant operating and investing noncash items related to discontinued operations. Additional disclosures are required when an entity retains significant continuing involvement with a discontinued operation after its disposal, including the amount of cash flows to and from a discontinued operation. The new standard applies prospectively after the effective date of December 15, 2014, and early adoption is permitted. We do not expect that this ASU will have a material impact on our results of operations or financial position.
	Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure
	In January 2014, the FASB issued ASU No. 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. The ASU clarifies that an in substance repossession or foreclosure has occurred and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure. Interim and annual disclosure is required of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure. The new standard is effective using either the modified retrospective transition method or a prospective transition method for fiscal years and interim periods within those years, beginning after December 15, 2014, and early adoption is permitted. We do not expect that this ASU will have a material impact on our results of operations or financial position.
	Accounting for Investments in Qualified Affordable Housing Projects
	In January 2014, the FASB issued ASU No. 2014-01, Accounting for Investments in Qualified Affordable Housing Projects. The ASU permits reporting entities to make an accounting policy election to account for investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. The proportional amortization method permits the amortization of the initial cost of the investment in proportion to the tax credits and other tax benefits received, and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). The new standard is effective retrospectively for fiscal years and interim periods within those years, beginning after December 15, 2014, and early adoption is permitted. We do not expect that this ASU will have a material impact on our results of operations or financial position.

Earnings_Per_Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	EARNINGS PER SHARE
	The following table reconciles the numerators and denominators of basic earnings per share with that of diluted earnings per share for the periods presented:
		Three Months Ended June 30,				Six Months Ended June 30,
	(dollars in thousands, except shares and per share data)	2014		2013		2014		2013
	Numerator for Earnings per Share—Basic:
	Net income	$	14,720	$	14,103	$	28,753	$	26,433
	Less: Income allocated to participating shares	29		36		64		81
	Net Income Allocated to Shareholders	$	14,691	$	14,067	$	28,689	$	26,352
	Numerator for Earnings per Share—Diluted:
	Net income	14,720		14,103		$	28,753	$	26,433
	Net Income Available to Shareholders	$	14,720	$	14,103	$	28,753	$	26,433
	Denominators for Earnings per Share:
	Weighted Average Shares Outstanding—Basic	29,684,300		29,654,018		29,672,611		29,637,825
	Add: Dilutive potential shares	16,894		23,858		27,559		41,319
	Denominator for Treasury Stock Method—Diluted	29,701,194		29,677,876		29,700,170		29,679,144
	Weighted Average Shares Outstanding—Basic	29,684,300		29,654,018		29,672,611		29,637,825
	Add: Average participating shares outstanding	58,973		74,994		66,563		91,530
	Denominator for Two-Class Method—Diluted	29,743,273		29,729,012		29,739,174		29,729,355
	Earnings per share—basic	$	0.49	$	0.47	$	0.97	$	0.89
	Earnings per share—diluted	$	0.49	$	0.47	$	0.97	$	0.89
	Warrants considered anti-dilutive excluded from dilutive potential shares	517,012		517,012		517,012		517,012
	Stock options considered anti-dilutive excluded from dilutive potential shares	428,493		629,570		428,676		642,499
	Restricted stock considered anti-dilutive excluded from dilutive potential shares	42,079		51,136		39,005		50,211

Fair_Value_Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	FAIR VALUE MEASUREMENT
	We use fair value measurements when recording and disclosing certain financial assets and liabilities. Securities available-for-sale, trading assets and derivatives are recorded at fair value on a recurring basis. Additionally, from time to time, we may be required to record other assets at fair value on a nonrecurring basis, such as loans held for sale, impaired loans, other real estate owned, or OREO, mortgage servicing rights, or MSRs, and certain other assets.
	Fair value is the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market in an orderly transaction between market participants at the measurement date. An orderly transaction is a transaction that assumes exposure to the market for a period prior to the measurement date to allow for marketing activities that are usual and customary for transactions involving such assets or liabilities; it is not a forced transaction. In determining fair value, we use various valuation approaches, including market, income and cost approaches. The fair value standard establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing an asset or liability, which is developed, based on market data we have obtained from independent sources. Unobservable inputs reflect our estimate of assumptions that market participants would use in pricing an asset or liability, which are developed based on the best information available in the circumstances.
	The fair value hierarchy gives the highest priority to unadjusted quoted market prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The fair value hierarchy is broken down into three levels based on the reliability of inputs as follows:
	Level 1: valuation is based upon unadjusted quoted market prices for identical instruments traded in active markets.
	Level 2: valuation is based upon quoted market prices for similar instruments traded in active markets, quoted market prices for identical or similar instruments traded in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by market data.
	Level 3: valuation is derived from other valuation methodologies, including discounted cash flow models and similar techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in determining fair value.
	A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Our policy is to recognize transfers between any of the fair value hierarchy levels at the end of the reporting period in which the transfer occurred.
	The following are descriptions of the valuation methodologies that we use for financial instruments recorded at fair value on either a recurring or nonrecurring basis.
	Recurring Basis
	Securities Available-for-Sale
	Securities available-for-sale include both debt and equity securities. We obtain fair values for debt securities from a third-party pricing service which utilizes several sources for valuing fixed-income securities. We validate prices received from our pricing service through comparison to a secondary pricing service and broker quotes. We review the methodologies of the pricing service which provides us with a sufficient understanding of the valuation models, assumptions, inputs and pricing to reasonably measure the fair value of our debt securities. The market valuation sources for debt securities include observable inputs rather than significant unobservable inputs and are classified as Level 2. The service provider utilizes pricing models that vary by asset class and include available trade, bid and other market information. Generally, the methodologies include broker quotes, proprietary models and vast descriptive terms and conditions databases, as well as extensive quality control programs.
	Marketable equity securities that have an active, quotable market are classified as Level 1. Marketable equity securities that are quotable, but are thinly traded or inactive, are classified as Level 2. Marketable equity securities that are not readily traded and do not have a quotable market are classified as Level 3.
	Trading Assets
	We use quoted market prices to determine the fair value of our trading assets. Our trading assets are held in a Rabbi Trust under a deferred compensation plan and are invested in readily quoted mutual funds. Accordingly, these assets are classified as Level 1.
	Derivative Financial Instruments
	We use derivative instruments including interest rate swaps for commercial loans with our customers and we sell mortgage loans in the secondary market and enter into interest rate lock commitments. We calculate the fair value for derivatives using widely accepted valuation techniques, including discounted cash flow analysis on the expected cash flows of each derivative. Each valuation considers the contractual terms of the derivative, including the period to maturity, and uses observable market based inputs, such as interest rate curves and implied volatilities. Accordingly, derivatives are classified as Level 2.
	We incorporate credit valuation adjustments into the valuation models to appropriately reflect both our own nonperformance risk and the respective counterparty’s nonperformance risk in calculating fair value measurements. In adjusting the fair value of our derivative contracts for the effect of nonperformance risk, we have considered the impact of netting and any applicable credit enhancements and collateral postings.
	Nonrecurring Basis
	Loans Held for Sale
	Loans held for sale consist of 1-4 family residential loans originated for sale in the secondary market and, from time to time, certain loans transferred from the loan portfolio to loans held for sale, all of which are carried at the lower of cost or fair value. The fair value of 1-4 family residential loans is based on the principal or most advantageous market currently offered for similar loans using observable market data. The fair value of the loans transferred from the loan portfolio is based on the amounts offered for these loans in currently pending sales transactions. Loans held for sale carried at fair value are classified as Level 3.
	Impaired Loans
	Impaired loans are carried at the lower of carrying value or fair value. Fair value is determined as the recorded investment balance less any specific reserve. We establish a specific reserve based on the following three impairment methods: 1) the present value of expected future cash flows discounted at the loan’s original effective interest rate, 2) the loan’s observable market price or 3) the fair value of the collateral less estimated selling costs when the loan is collateral dependent and we expect to liquidate the collateral. However, if repayment is expected to come from the operation of the collateral, rather than liquidation, then we do not consider estimated selling costs in determining the fair value of the collateral. Collateral values are generally based upon appraisals by approved, independent state certified appraisers.
	Appraisals may be discounted based on our historical knowledge, changes in market conditions from the time of appraisal or our knowledge of the borrower and the borrower’s business. Impaired loans carried at fair value are classified as Level 3.
	OREO and Other Repossessed Assets
	OREO and other repossessed assets obtained in partial or total satisfaction of a loan are recorded at the lower of recorded investment in the loan or fair value less cost to sell. Subsequent to foreclosure, these assets are carried at the lower of the amount recorded at acquisition date or fair value less cost to sell. Accordingly, it may be necessary to record nonrecurring fair value adjustments. Fair value, when recorded, is generally based upon appraisals by approved, independent state certified appraisers. Like impaired loans, appraisals on OREO may be discounted based on our historical knowledge, changes in market conditions from the time of appraisal or other information available to us. OREO and other repossessed assets are classified as Level 3.
	Mortgage Servicing Rights
	The fair value of MSRs is determined by calculating the present value of estimated future net servicing cash flows, considering expected mortgage loan prepayment rates, discount rates, servicing costs and other economic factors, which are determined based on current market conditions. The expected rate of mortgage loan prepayments is the most significant factor affecting the value of MSRs. MSRs are considered impaired if the carrying value exceeds fair value. The valuation model includes significant unobservable inputs; therefore, MSRs are classified as Level 3.
	Other Assets
	We measure certain other assets at fair value on a nonrecurring basis. Fair value is based on the application of lower of cost or fair value accounting, or write-downs of individual assets. Valuation methodologies used to measure fair value are consistent with overall principles of fair value accounting and consistent with those described above.
	Financial Instruments
	In addition to financial instruments recorded at fair value in our financial statements, fair value accounting guidance requires disclosure of the fair value of all of an entity’s assets and liabilities that are considered financial instruments. The majority of our assets and liabilities are considered financial instruments. Many of these instruments lack an available trading market as characterized by a willing buyer and willing seller engaged in an exchange transaction. Also, it is our general practice and intent to hold our financial instruments to maturity and to not engage in trading or sales activities with respect to such financial instruments. For fair value disclosure purposes, we substantially utilize the fair value measurement criteria as required and explained above. In cases where quoted fair values are not available, we use present value methods to determine the fair value of our financial instruments.
	Cash and Cash Equivalents and Other Short-Term Assets
	The carrying amounts reported in the Consolidated Balance Sheets for cash and due from banks, including interest-bearing deposits, approximate fair value.
	Loans
	The fair value of variable rate performing loans that may reprice frequently at short-term market rates is based on carrying values adjusted for credit risk. The fair value of variable rate performing loans that reprice at intervals of one year or longer, such as adjustable rate mortgage products, is estimated using discounted cash flow analyses that utilize interest rates currently being offered for similar loans and adjusted for credit risk. The fair value of fixed rate performing loans is estimated using discounted cash flow analyses that utilize interest rates currently being offered for similar loans and adjusted for credit risk. The fair value of nonperforming loans is based on their carrying values less any specific reserve. The carrying amount of accrued interest approximates fair value.
	Bank Owned Life Insurance
	Fair value approximates net cash surrender value.
	Deposits
	The fair values disclosed for deposits without defined maturities (e.g., noninterest and interest-bearing demand, money market and savings accounts) are by definition equal to the amounts payable on demand. The carrying amounts for variable rate, fixed-term time deposits approximate their fair values. Estimated fair values for fixed rate and other time deposits are based on discounted cash flow analysis using interest rates currently offered for time deposits with similar terms. The carrying amount of accrued interest approximates fair value.
	Short-Term Borrowings
	The carrying amounts of securities sold under repurchase agreements, federal funds purchased and other short-term borrowings approximate their fair values.
	Long-Term Borrowings
	The fair values disclosed for fixed rate long-term borrowings are determined by discounting their contractual cash flows using current interest rates for long-term borrowings of similar remaining maturities. The carrying amounts of variable rate long-term borrowings approximate their fair values.
	Junior Subordinated Debt Securities
	The variable rate junior subordinated debt securities reprice quarterly; therefore, the fair values are based on the carrying values.
	Loan Commitments and Standby Letters of Credit
	Off-balance sheet financial instruments consist of commitments to extend credit and letters of credit. Except for interest rate lock commitments, estimates of the fair value of these off-balance sheet items are not made because of the short-term nature of these arrangements and the credit standing of the counterparties.
	Other
	Estimates of fair value are not made for items that are not defined as financial instruments, including such items as our core deposit intangibles and the value of our trust operations.
	The following tables present our assets and liabilities that are measured at fair value on a recurring basis by fair value hierarchy level at June 30, 2014 and December 31, 2013. There were no transfers between Level 1 and Level 2 for items measured at fair value on a recurring basis during the periods presented.
		30-Jun-14
	(dollars in thousands)	Level 1		Level 2			Level 3			Total
	ASSETS
	Securities available-for-sale:
	Obligations of U.S. government corporations and agencies	$	—	$	270,248		$	—		$	270,248
	Collateralized mortgage obligations of U.S. government corporations and agencies	—		94,604			—			94,604
	Residential mortgage-backed securities of U.S. government corporations and agencies	—		46,389			—			46,389
	Commercial mortgage-backed securities of U.S. government corporations and agencies	—		39,920			—			39,920
	Obligations of states and political subdivisions	—		128,313			—			128,313
	Marketable equity securities	179		8,835			—			9,014
	Total securities available-for-sale	179		588,309			—			588,488
	Trading securities held in a Rabbi Trust	3,117		—			—			3,117
Total securities	3,296		588,309			—			591,605
Derivative financial assets:
Interest rate swaps	—		14,082			—			14,082
Interest rate lock commitments	—		292			—			292
Forward sale contracts	—		—			—			—
Total Assets	$	3,296	$	602,683		$	—		$	605,979
LIABILITIES
Derivative financial liabilities:
Interest rate swaps	$	—	$	14,050		$	—		$	14,050
Forward sale contracts	—		59			—			$	59
Total Liabilities	$	—	$	14,109		$	—		$	14,109
	December 31, 2013
(dollars in thousands)	Level 1		Level 2			Level 3			Total
ASSETS
Securities available-for-sale:
Obligations of U.S. government corporations and agencies	$	—	$	234,751		$	—		$	234,751
Collateralized mortgage obligations of U.S. government corporations and agencies	—		63,774			—			63,774
Residential mortgage-backed securities of U.S. government corporations and agencies	—		48,669			—			48,669
Commercial mortgage-backed securities of U.S. government corporations and agencies	—		39,052			—			39,052
Obligations of states and political subdivisions	—		114,264			—			114,264
Marketable equity securities	202		8,713			—			8,915
Total securities available-for-sale	202		509,223			—			509,425
Trading securities held in a Rabbi Trust	2,864		—			—			2,864
Total securities	3,066		509,223			—			512,289
Derivative financial assets:
Interest rate swaps	—		13,698			—			13,698
Interest rate lock commitments	—		85			—			85
Forward sale contracts	—		34			—			34
Total Assets	$	3,066	$	523,040		$	—		$	526,106
LIABILITIES
Derivative financial liabilities:
Interest rate swaps	$	—	$	13,647		$	—		$	13,647
Total Liabilities	$	—	$	13,647		$	—		$	13,647
We classify financial instruments as Level 3 when valuation models are used because significant inputs are not observable in the market. The following table presents the changes in assets measured at fair value on a recurring basis for which we have utilized Level 3 inputs to determine the fair value:
	Three Months Ended June 30,						Six Months Ended June 30,
(dollars in thousands)	2014		2013				2014			2013
Balance at beginning of period	$	—	$	312			$	—		$	300
Total gains included in other comprehensive income(1)	—		32				—			44
Net purchases, sales, issuances and settlements	—		—				—			—
Transfers out of Level 3	—		(344		)		—			(344		)
Balance at end of period	$	—	$	—			$	—		$	—
(1) Changes in estimated fair value of available-for-sale investments are recorded in accumulated other comprehensive income (loss), while realized gains and losses from sales are recorded in security gains (losses), net in the Consolidated Statements of Comprehensive Income.
We may be required to measure certain assets and liabilities on a nonrecurring basis. The following table presents our assets that were measured at fair value on a nonrecurring basis by the fair value hierarchy level at June 30, 2014 and December 31, 2013. There were no liabilities measured at fair value on a nonrecurring basis during these periods.
	June 30, 2014												December 31, 2013
(dollars in thousands)	Level 1		Level 2			Level 3			Total				Level 1		Level 2		Level 3		Total
ASSETS
Loans held for sale	$	—	$	—		$	1,300		$	1,300			$	—	$	—	$	1,516	$	1,516
Impaired loans	—		—			14,483			14,483				—		—		19,197		19,197
Other real estate owned	—		—			317			317				—		—		317		317
Mortgage servicing rights	—		—			1,211			1,211				—		—		1,025		1,025
Total Assets	$	—	$	—		$	17,311		$	17,311			$	—	$	—	$	22,055	$	22,055
The carrying values and fair values of our financial instruments at June 30, 2014 and December 31, 2013 are presented in the following tables:
	Carrying		Fair Value Measurements at June 30, 2014
(dollars in thousands)	Value(1)		Total			Level 1			Level 2			Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits	$	130,235	$	130,235		$	130,235		$	—		$	—
Securities available-for-sale	588,488		588,488			179			588,309			—
Loans held for sale	3,102		3,121			—			—			3,121
Portfolio loans, net of unearned income	3,725,079		3,691,807			—			—			3,691,807
Bank owned life insurance	61,348		61,348			—			61,348			—
FHLB and other restricted stock	15,818		15,818			—			—			15,818
Trading securities held in a Rabbi Trust	3,117		3,117			3,117			—			—
Mortgage servicing rights	2,743		2,890			—			—			2,890
Interest rate swaps	14,082		14,082			—			14,082			—
Interest rate lock commitments	292		292			—			292			—
LIABILITIES
Deposits	$	3,865,246	$	3,867,540		$	—		$	—		$	3,867,540
Securities sold under repurchase agreements	25,269		25,269			—			—			25,269
Short-term borrowings	185,000		185,000			—			—			185,000
Long-term borrowings	20,636		21,779			—			—			21,779
Junior subordinated debt securities	45,619		45,619			—			—			45,619
Interest rate swaps	14,050		14,050			—			14,050			—
Forward sale contracts	59		59			—			59			—
(1) As reported in the Consolidated Balance Sheets
	Carrying		Fair Value Measurements at December 31, 2013
(dollars in thousands)	Value(1)		Total			Level 1			Level 2			Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits	$	108,356	$	108,356		$	108,356		$	—		$	—
Securities available-for-sale	509,425		509,425			202			509,223			—
Loans held for sale	2,136		2,139			—			—			2,139
Portfolio loans, net of unearned income	3,566,199		3,538,072			—			—			3,538,072
Bank owned life insurance	60,480		60,480			—			60,480			—
FHLB and other restricted stock	13,629		13,629			—			—			13,629
Trading securities held in a Rabbi Trust	2,864		2,864			2,864			—			—
Mortgage servicing rights	2,919		3,143			—			—			3,143
Interest rate swaps	13,698		13,698			—			13,698			—
Interest rate lock commitments	85		85			—			85			—
Forward sale contracts	34		34			—			34			—
LIABILITIES
Deposits	$	3,672,308	$	3,673,624		$	—		$	—		$	3,673,624
Securities sold under repurchase agreements	33,847		33,847			—			—			33,847
Short-term borrowings	140,000		140,000			—			—			140,000
Long-term borrowings	21,810		22,924			—			—			22,924
Junior subordinated debt securities	45,619		45,619			—			—			45,619
Interest rate swaps	13,647		13,647			—			13,647			—
(1) As reported in the Consolidated Balance Sheets

Securities_AvailableforSale

Securities Available-for-Sale	6 Months Ended
	Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Securities Available-for-Sale	'
	SECURITIES AVAILABLE-FOR-SALE
	The following table indicates the composition of the securities available-for-sale portfolio as of the dates presented:
		June 30, 2014													December 31, 2013
	(dollars in thousands)	Amortized			Gross			Gross			Fair				Amortized			Gross			Gross			Fair
		Cost			Unrealized			Unrealized			Value				Cost			Unrealized			Unrealized			Value
					Gains			Losses										Gains			Losses
	Obligations of U.S. government corporations and agencies	$	268,614		$	2,733		$	(1,099	)	$	270,248			$	235,181		$	2,151		$	(2,581	)	$	234,751
	Collateralized mortgage obligations of U.S. government corporations and agencies	93,787			1,035			(218		)	94,604				63,776			601			(603		)	63,774
	Residential mortgage-backed securities of U.S. government corporations and agencies	44,900			1,720			(231		)	46,389				47,934			1,420			(685		)	48,669
	Commercial mortgage-backed securities of U.S. government corporations and agencies	40,098			224			(402		)	39,920				40,357			—			(1,305		)	39,052
	Obligations of states and political subdivisions	124,648			4,017			(352		)	128,313				115,572			1,294			(2,602		)	114,264
	Debt Securities	572,047			9,729			(2,302		)	579,474				502,820			5,466			(7,776		)	500,510
	Marketable equity securities	7,579			1,435			—			9,014				7,579			1,336			—			8,915
	Total	$	579,626		$	11,164		$	(2,302	)	$	588,488			$	510,399		$	6,802		$	(7,776	)	$	509,425
	Realized gains and losses on the sale of securities are determined using the specific-identification method. The following table shows the composition of gross and net realized gains and losses for the periods presented:
		Three Months Ended June 30,								Six Months Ended June 30,
	(dollars in thousands)	2014				2013				2014				2013
	Gross realized gains	$	40			$	—			$	41			$	2
	Gross realized losses	—				—				—				—
	Net Realized Gains	$	40			$	—			$	41			$	2
	The following tables indicate the fair value and the age of gross unrealized losses by investment category as of the dates presented:
		June 30, 2014
		Less Than 12 Months								12 Months or More								Total
	(dollars in thousands)	Number of Securities	Fair Value			Unrealized				Number of Securities	Fair Value			Unrealized				Fair Value			Number of Securities	Unrealized
						Losses								Losses								Losses
	Obligations of U.S. government corporations and agencies	2	$	19,741		$	(78	)		8	$	63,265		$	(1,021	)		$	83,006		10	$	(1,099	)
	Collateralized mortgage obligations of U.S. government corporations and agencies	1	11,420			(218		)		—	—			—				11,420			1	(218		)
	Residential mortgage-backed securities of U.S. government corporations and agencies	—	—			—				1	9,414			(231		)		9,414			1	(231		)
	Commercial mortgage-backed securities of U.S. government corporations and agencies	1	10,009			(16		)		2	20,837			(386		)		30,846			3	(402		)
	Obligations of states and political subdivisions	1	264			(1		)		3	15,975			(351		)		16,239			4	(352		)
	Debt Securities	5	41,434			(313		)		14	109,491			(1,989		)		150,925			19	(2,302		)
	Marketable equity securities	—	—			—				—	—			—				—			—	—
	Total Temporarily Impaired Securities	5	$	41,434		$	(313	)		14	$	109,491		$	(1,989	)		$	150,925		19	$	(2,302	)
		December 31, 2013
		Less Than 12 Months								12 Months or More								Total
	(dollars in thousands)	Number of Securities	Fair Value			Unrealized				Number of Securities	Fair Value			Unrealized				Fair Value			Number of Securities	Unrealized
						Losses								Losses								Losses
	Obligations of U.S. government corporations and agencies	16	$	126,017		$	(2,581	)		—	$	—		$	—			$	126,017		16	$	(2,581	)
	Collateralized mortgage obligations of U.S. government corporations and agencies	3	39,522			(603		)		—	—			—				39,522			3	(603		)
	Residential mortgage-backed securities of U.S. government corporations and agencies	2	22,822			(685		)		—	—			—				22,822			2	(685		)
	Commercial mortgage-backed securities of U.S. government corporations and agencies	4	39,052			(1,305		)		—	—			—				39,052			4	(1,305		)
	Obligations of states and political subdivisions	16	47,529			(1,739		)		2	10,088			(863		)		57,617			18	(2,602		)
	Debt Securities	41	274,942			(6,913		)		2	10,088			(863		)		285,030			43	(7,776		)
	Marketable equity securities	—	—			—				—	—			—				—			—	—
	Total Temporarily Impaired Securities	41	$	274,942		$	(6,913	)		2	$	10,088		$	(863	)		$	285,030		43	$	(7,776	)
	We do not believe any individual unrealized loss as of June 30, 2014 represents an other than temporary impairment, or OTTI. As of June 30, 2014, the unrealized losses on 19 debt securities were attributable to changes in interest rates and not related to the credit quality of these securities. All debt securities are determined to be investment grade and are paying principal and interest according to the contractual terms of the security. There were no unrealized losses on marketable equity securities as of June 30, 2014. We do not intend to sell and it is not more likely than not that we will be required to sell any of the securities, referenced in the table above, in an unrealized loss position before recovery of their amortized cost.
	The following table displays net unrealized gains and losses, net of tax on securities available for sale included in accumulated other comprehensive income/(loss) for the periods presented.
		30-Jun-14										31-Dec-13
	(dollars in thousands)	Gross Unrealized Gains			Gross Unrealized Losses			Net Unrealized Gains/ (Losses)				Gross Unrealized Gains			Gross Unrealized Losses			Net Unrealized Gains/ (Losses)
	Total unrealized gains/(losses) on securities available-for-sale	$	11,164		$	(2,302	)	$	8,862			$	6,802		$	(7,776	)	$	(974	)
	Income tax expense/(benefit)	3,907			(806		)	3,101				2,381			(2,722		)	(341		)
	Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss)	$	7,257		$	(1,496	)	$	5,761			$	4,421		$	(5,054	)	$	(633	)
	The amortized cost and fair value of securities available-for-sale at June 30, 2014, by contractual maturity, are included in the table below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
		30-Jun-14
	(dollars in thousands)	Amortized				Fair Value
		Cost
	Obligations of U.S. government corporations and agencies, and obligations of states and political subdivisions
	Due in one year or less	$	24,049			$	24,289
	Due after one year through five years	182,816				184,074
	Due after five years through ten years	98,068				99,420
	Due after ten years	88,329				90,778
		393,262				398,561
	Collateralized mortgage obligations of U.S. government corporations and agencies	93,787				94,604
Residential mortgage-backed securities of U.S. government corporations and agencies	44,900				46,389
Commercial mortgage-backed securities of U.S. government corporations and agencies	40,098				39,920
Debt Securities	572,047				579,474
Marketable equity securities	7,579				9,014
Total	$	579,626			$	588,488
At June 30, 2014 and December 31, 2013, securities with carrying values of $273.5 million and $243.2 million were pledged for various regulatory and legal requirements.

Loans_and_Loans_Held_for_Sale

Loans and Loans Held for Sale	6 Months Ended
	Jun. 30, 2014
Receivables [Abstract]	'
Loans and Loans Held for Sale	'
	LOANS AND LOANS HELD FOR SALE
	Loans are presented net of unearned income of $1.8 million and $1.3 million at June 30, 2014 and December 31, 2013. The following table indicates the composition of the loans as of the dates presented:
	(dollars in thousands)	June 30, 2014				December 31, 2013
	Commercial
	Commercial real estate	$	1,636,383			$	1,607,756
	Commercial and industrial	922,191				842,449
	Commercial construction	188,311				143,675
	Total Commercial Loans	2,746,885				2,593,880
	Consumer
	Residential mortgage	492,589				487,092
	Home equity	416,226				414,195
	Installment and other consumer	65,838				67,883
	Consumer construction	3,541				3,149
	Total Consumer Loans	978,194				972,319
	Total Portfolio Loans	3,725,079				3,566,199
	Loans held for sale	3,102				2,136
	Total Loans	$	3,728,181			$	3,568,335
	We attempt to limit our exposure to credit risk by diversifying our loan portfolio and actively managing concentrations. When concentrations exist in certain segments, we mitigate this risk by monitoring the relevant economic indicators and internal risk rating trends and through stress testing of the loans in these segments. Total commercial loans represented 74 percent of total portfolio loans at June 30, 2014 and 73 percent of total portfolio loans at December 31, 2013. Within our commercial portfolio, the commercial real estate, or CRE, and commercial construction portfolios combined comprised 66 percent of total commercial loans and 49 percent of total portfolio loans at June 30, 2014 and 68 percent of total commercial loans and 49 percent of total portfolio loans at December 31, 2013. Further segmentation of the CRE and commercial construction portfolios by industry and collateral type revealed no concentration in excess of nine percent of total loans at either June 30, 2014 or December 31, 2013. The majority of both commercial and consumer loans are made to businesses and individuals in Western Pennsylvania resulting in a geographic concentration. The conditions of the local and regional economies are monitored closely through publicly available data as well as information supplied by our customers. Management believes underwriting guidelines, active monitoring of economic conditions and ongoing review by credit administration mitigates the concentration risk present in the loan portfolio. Only the CRE and commercial construction portfolios combined have any significant out-of-state exposure, with 26 percent of the combined portfolio and 13 percent of total loans being out-of-state loans at June 30, 2014 and 23 percent of the combined portfolio and 11 percent of total loans being out-of-state loans at December 31, 2013. Our CRE and commercial construction portfolios combined out-of-state exposure, excluding the contiguous states of Ohio, West Virginia, New York and Maryland, was 7.2 percent of the combined portfolio and 3.6 percent of total loans at June 30, 2014 and 7.9 percent of the combined portfolio and 3.9 percent of total loans at December 31, 2013.
	Troubled debt restructurings, or TDRs, are loans where we, for economic or legal reasons related to a borrower’s financial difficulties, grant a concession to the borrower that we would not otherwise grant. We strive to identify borrowers in financial difficulty early and work with them to modify the terms before their loan reaches nonaccrual status. These modified terms generally include extensions of maturity dates at a stated interest rate lower than the current market rate for a new loan with similar risk characteristics, reductions in contractual interest rates or principal deferment. While unusual, there may be instances of principal forgiveness. These modifications are generally for longer term periods that would not be considered insignificant. Additionally, we classify loans where the debt obligation has been discharged through a Chapter 7 Bankruptcy and not reaffirmed as TDRs.
	We individually evaluate all substandard commercial loans that have experienced a forbearance or change in terms agreement, as well as all substandard consumer and residential mortgage loans that entered into an agreement to modify their existing loan to determine if they should be designated as TDRs. All TDRs are considered to be impaired loans and will be reported as impaired loans for the remaining life of the loan, unless the restructuring agreement specifies an interest rate equal to or greater than the rate that would be accepted at the time of the restructuring for a new loan with comparable risk and it is fully expected that the remaining principal and interest will be collected according to the restructured agreement. Further, all impaired loans are reported as nonaccrual loans unless the loan is a TDR that has met the requirements to be returned to accruing status. TDRs can be returned to accruing status if the ultimate collectability of all contractual amounts due, according to the restructured agreement, is not in doubt and there is a period of a minimum of six months of satisfactory payment performance by the borrower either immediately before or after the restructuring.
	The following table summarizes the restructured loans as of the dates presented:
		June 30, 2014										December 31, 2013
	(dollars in thousands)	Accruing			Nonaccruing			Total				Accruing			Nonaccruing			Total
		TDRs			TDRs			TDRs				TDRs			TDRs			TDRs
	Commercial real estate	$	16,934		$	1,431		$	18,365			$	19,711		$	3,898		$	23,609
	Commercial and industrial	7,390			1,170			8,560				7,521			1,884			9,405
	Commercial construction	6,310			1,869			8,179				5,338			2,708			8,046
	Residential mortgage	2,647			645			3,292				2,581			1,356			3,937
	Home equity	3,712			125			3,837				3,924			218			4,142
	Installment and other consumer	127			1			128				154			3			157
	Total	$	37,120		$	5,241		$	42,361			$	39,229		$	10,067		$	49,296
	We returned four TDRs for $1.4 million to accruing status during the three months ended June 30, 2014 and five TDRs for $1.5 million to accruing status during the six months ended June 30, 2014. There were no TDRs returned to accruing status during the three months ended June 30, 2013 and one TDR for $0.2 million was returned to accruing status during the six months ended June 30, 2013.
	The following tables present the restructured loans for the three and six month periods ended June 30, 2014 and June 30, 2013:
		Three Months Ended June 30, 2014												Three Months Ended June 30, 2013
	(dollars in thousands)	Number of		Pre-Modification			Post-Modification			Total  Difference				Number of		Pre-Modification			Post-Modification		Total  Difference
		Loans		Outstanding			Outstanding			in Recorded				Loans		Outstanding			Outstanding		in Recorded
				Recorded			Recorded			Investment						Recorded			Recorded		Investment
				Investment(1)			Investment(1)									Investment(1)			Investment(1)
	Commercial real estate
	Principal forgiveness (3)	—		$	—		$	—		$	—			1		$	4,339		$	4,339	$	—
	Principal deferral	1		129			127			(2		)		—		—			—		—
	Chapter 7 bankruptcy(2)	—		—			—			—				4		53			51		(2		)
	Commercial and industrial
	Maturity date extension	—		—			—			—				1		751			751		—
	Residential mortgage
	Chapter 7 bankruptcy(2)	1		52			52			—				2		84			75		(9		)
	Home equity
	Chapter 7 bankruptcy(2)	4		43			41			(2		)		17		486			478		(8		)
	Installment and other consumer
	Chapter 7 bankruptcy(2)	1		9			9			—				—		—			—		—
	Total by Concession Type
	Principal forgiveness  (3)	—		—			—			—				1		4,339			4,339		—
	Principal deferral	1		129			127			(2		)		—		—			—		—
	Chapter 7 bankruptcy(2)	6		104			102			(2		)		23		623			604		(19		)
	Maturity date extension	—		—			—			—				1		751			751		—
	Total	7		$	233		$	229		$	4			25		5,713			5,694		(19		)
	(1) Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.
	(2) Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.
	(3) This loan had debt forgiveness of $0.l million to the customer; however, the loan was previously charged off to a balance below the actual contractual balance.
		Six Months Ended June 30, 2014												Six Months Ended June 30, 2013
	(dollars in thousands)	Number of		Pre-Modification			Post-Modification			Total  Difference				Number of		Pre-Modification			Post-Modification		Total  Difference
		Loans		Outstanding			Outstanding			in Recorded				Loans		Outstanding			Outstanding		in Recorded
				Recorded			Recorded			Investment						Recorded			Recorded		Investment
		Investment(1)			Investment(1)									Investment(1)			Investment(1)
Commercial real estate
Principal deferral	1		$	129		$	127		$	(2	)		3		$	1,541		$	1,288	$	(253	)
Principal forgiveness(3)	—		—			—			—				1		4,339			4,339		—
Chapter 7 bankruptcy(2)	—		—			—			—				7		258			255		(3		)
Commercial and industrial
Principal deferral	—		—			—			—				1		392			387		(5		)
Maturity date extension	—		—			—			—				1		751			751		—
Chapter 7 bankruptcy(2)	1		287			286			(1		)		1		3			3		—
Commercial Construction
Maturity date extension	1		1,019			1,019			—				—		—			—		—
Residential mortgage
Principal deferral	—		—			—			—				2		153			153		—
Chapter 7 bankruptcy(2)	5		329			327			(2		)		8		353			344		(9		)
Home equity
Principal deferral	—		—			—			—				1		174			45		(129		)
Chapter 7 bankruptcy(2)	10		269			251			(18		)		23		648			640		(8		)
Installment and other consumer
Chapter 7 bankruptcy(2)	1		9			9			—				6		73			73		—
Total by Concession Type
Principal deferral	1		129			127			(2		)		7		2,260			1,873		(387		)
Principal forgiveness(3)	—		—			—			—				1		4,339			4,339		—
Maturity date extension	1		1,019			1,019			—				1		751			751		—
Chapter 7 bankruptcy(2)	17		894			873			(21		)		45		1,335			1,315		(20		)
Total	19		$	2,042		$	2,019		$	(23	)		54		$	8,685		8,278		(407		)
(1) Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.
(2) Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.
(3) This loan had debt forgiveness of $0.l million to the customer; however, the loan was previously charged off to a balance below the actual contractual balance.
For the three months ended June 30, 2014, we modified two CRE loans totaling $1.2 million that were not considered to be TDRs. For the six months ended June 30, 2014, we modified three loans that were not considered to be TDRs, including a $0.4 million commercial and industrial, or C&I, loan and two CRE loans for $1.2 million. The modifications primarily represented instances where we were adequately compensated through additional collateral and a higher interest rate or there was an insignificant delay in payment. As of June 30, 2014 we have no commitments to lend additional funds on any TDRs.
Defaulted TDRs are defined as loans having a payment default of 90 days or more after the restructuring takes place. The following tables present a summary of TDRs which defaulted during the periods presented that had been restructured within the last twelve months prior to defaulting:
	Defaulted TDRs
	For the Three Months ended June 30, 2014						For the Three Months ended June 30, 2013
(dollars in thousands)	Number of		Recorded				Number of			Recorded
	Defaults		Investment				Defaults			Investment
Commercial real estate	—		$	—			$	—		$	—
Commercial and Industrial	—		—				—			—
Commercial construction	—		—				—			—
Residential real estate	—		—				2			46
Home equity	—		—				2			33
Total	—		$	—			$	4		$	79
	Defaulted TDRs
	For the Six Months Ended						For the Six Months Ended
	30-Jun-14						30-Jun-13
(dollars in thousands)	Number of		Recorded				Number of			Recorded
	Defaults		Investment				Defaults			Investment
Commercial real estate	—		$	—			$	—		$	—
Commercial and Industrial	—		—				—			—
Commercial construction	—		—				—			—
Residential real estate	1		72				3			64
Home equity	—		—				4			151
Total	1		$	72			$	7		$	215
The following table is a summary of nonperforming assets as of the dates presented:
	Nonperforming Assets
(dollars in thousands)	June 30, 2014				December 31, 2013
Nonperforming Assets
Nonaccrual loans	$	9,698			$	12,387
Nonaccrual TDRs	5,241				10,067
Total nonaccrual loans	14,939				22,454
OREO	431				410
Total Nonperforming Assets	$	15,370			$	22,864
OREO consists of eight properties and is included in other assets in the Consolidated Balance Sheets. It is our policy to obtain OREO appraisals on an annual basis.

Allowance_for_Loan_Losses

Allowance for Loan Losses	6 Months Ended
	Jun. 30, 2014
Receivables [Abstract]	'
Allowance for Loan Losses	'
	We maintain an allowance for loan losses, or ALL, at a level determined to be adequate to absorb estimated probable credit losses inherent in the loan portfolio as of the balance sheet date. We develop and document a systematic ALL methodology based on the following portfolio segments: 1) CRE, 2) C&I, 3) Commercial Construction, 4) Consumer Real Estate and 5) Other Consumer.
	The following are key risks within each portfolio segment:
	CRE—Loans secured by commercial purpose real estate, including both owner occupied properties and investment properties, for various purposes such as hotels, strip malls and apartments. Operations of the individual projects as well as global cash flows of the debtors are the primary sources of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the collateral type as well as the business prospects of the lessee, if the project is not owner occupied.
	C&I—Loans made to operating companies or manufacturers for the purpose of production, operating capacity, accounts receivable, inventory or equipment financing. Cash flow from the operations of the company is the primary source of repayment for these loans. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the industry of the company. Collateral for these types of loans often do not have sufficient value in a distressed or liquidation scenario to satisfy the outstanding debt.
	Commercial Construction—Loans made to finance construction of buildings or other structures, as well as to finance the acquisition and development of raw land for various purposes. While the risk of these loans is generally confined to the construction period, if there are problems, the project may not be complete, and as such, may not provide sufficient cash flow on its own to service the debt or have sufficient value in a liquidation to cover the outstanding principal. The condition of the local economy is an important indicator of risk, but there are also more specific risks depending on the type of project and the experience and resources of the developer.
	Consumer Real Estate—Loans secured by first and second liens such as home equity loans, home equity lines of credit and 1-4 family residences, including purchase money mortgages. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The state of the local housing market can also have a significant impact on this segment because low demand and/or declining home values can limit the ability of borrowers to sell a property and satisfy the debt.
	Other Consumer—Loans made to individuals that may be secured by assets other than 1-4 family residences, as well as unsecured loans. This segment includes auto loans, unsecured loans and lines and credit cards. The primary source of repayment for these loans is the income and assets of the borrower. The condition of the local economy, in particular the unemployment rate, is an important indicator of risk for this segment. The value of the collateral, if there is any, is less likely to be a source of repayment due to less certain collateral values.
	We further assess risk within each portfolio segment by pooling loans with similar risk characteristics. For the commercial loan classes, the most important indicator of risk is the internally assigned risk rating, including pass, special mention and substandard. Consumer loans are pooled by type of collateral, lien position and loan to value ratio for consumer real estate loans. Historical loss rates are applied to these loan pools to determine the reserve for loans collectively evaluated for impairment.
	We continually monitor our ALL methodology to ensure that it is responsive to the current economic environment. No changes were made to our ALL methodology for the six months ended June 30, 2014.
	Management monitors various credit quality indicators for both the commercial and consumer loan portfolios, including delinquency, nonperforming status and changes in risk ratings on a monthly basis.
	The following tables present the age analysis of past due loans segregated by class of loans as of June 30, 2014 and December 31, 2013:
		June 30, 2014
	(dollars in thousands)	Current			30-59 Days			60-89 Days			Nonaccrual			Total Past			Total Loans
					Past Due			Past Due						Due
	Commercial real estate	$	1,629,928		$	753		$	44		$	5,658		$	6,455		$	1,636,383
	Commercial and industrial	918,846			559			249			2,537			3,345			922,191
	Commercial construction	185,428			—			1,014			1,869			2,883			188,311
	Residential mortgage	488,551			1,022			898			2,118			4,038			492,589
	Home equity	412,851			1,466			478			1,431			3,375			416,226
	Installment and other consumer	65,380			364			68			26			458			65,838
	Consumer construction	3,541			—			—			—			—			3,541
	Loans held for sale	1,802			—			—			1,300			1,300			3,102
	Totals	$	3,706,327		$	4,164		$	2,751		$	14,939		$	21,854		$	3,728,181
		December 31, 2013
	(dollars in thousands)	Current			30-59 Days			60-89 Days			Nonaccrual			Total Past			Total Loans
					Past Due			Past Due						Due
	Commercial real estate	$	1,595,590		$	1,209		$	207		$	10,750		$	12,166		$	1,607,756
	Commercial and industrial	836,276			2,599			278			3,296			6,173			842,449
	Commercial construction	139,133			1,049			751			2,742			4,542			143,675
	Residential mortgage	481,260			828			1,666			3,338			5,832			487,092
	Home equity	408,777			2,468			659			2,291			5,418			414,195
	Installment and other consumer	67,420			382			44			37			463			67,883
	Consumer construction	3,149			—			—			—			—			3,149
	Loans held for sale	2,136			—			—			—			—			2,136
	Totals	$	3,533,741		$	8,535		$	3,605		$	22,454		$	34,594		$	3,568,335
	We continually monitor the commercial loan portfolio through an internal risk rating system. Loan risk ratings are assigned based upon the creditworthiness of the borrower and are reviewed on an ongoing basis according to our internal policies. Loans within the pass rating generally have a lower risk of loss than loans risk rated as special mention or substandard.
	Our risk ratings are consistent with regulatory guidance and are as follows:
	Pass—The loan is currently performing and is of high quality.
	Special Mention—A special mention loan has potential weaknesses that warrant management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects or in the strength of our credit position at some future date. Economic and market conditions, beyond the borrower’s control, may in the future necessitate this classification.
	Substandard—A substandard loan is not adequately protected by the net worth and/or paying capacity of the borrower or by the collateral pledged, if any. Substandard loans have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. These loans are characterized by the distinct possibility that we will sustain some loss if the deficiencies are not corrected.
	The following tables summarize the recorded investment in commercial loan classes by internally assigned risk ratings as of the dates presented:
		June 30, 2014
	(dollars in thousands)	Commercial			% of			Commercial			% of			Commercial			% of			Total			% of
		Real Estate			Total			and Industrial			Total			Construction			Total						Total
	Pass	$	1,563,882		95.6	%		$	872,686		94.6	%		$	167,267		88.8	%		$	2,603,835		94.8	%
	Special mention	45,275			2.8	%		33,966			3.7	%		12,882			6.8	%		92,123			3.4	%
	Substandard	27,226			1.6	%		15,539			1.7	%		8,162			4.4	%		50,927			1.8	%
	Total	$	1,636,383		100	%		$	922,191		100	%		$	188,311		100	%		$	2,746,885		100	%
		December 31, 2013
	(dollars in thousands)	Commercial			% of			Commercial			% of			Commercial			% of			Total			% of
		Real Estate			Total			and Industrial			Total			Construction			Total						Total
	Pass	$	1,519,720		94.5	%		$	792,029		94	%		$	119,177		82.9	%		$	2,430,926		93.7	%
	Special mention	57,073			3.6	%		34,085			4.1	%		15,621			10.9	%		106,779			4.1	%
	Substandard	30,963			1.9	%		16,335			1.9	%		8,877			6.2	%		56,175			2.2	%
	Total	$	1,607,756		100	%		$	842,449		100	%		$	143,675		100	%		$	2,593,880		100	%
	We monitor the delinquent status of the consumer portfolio on a monthly basis. Loans are considered nonperforming when interest and principal are 90 days or more past due or management has determined that a material deterioration in the borrower’s financial condition exists. The risk of loss is generally highest for nonperforming loans.
	The following tables indicate the recorded investment in consumer loan classes by performing and nonperforming status as of the dates presented:
		June 30, 2014
	(dollars in thousands)	Residential			% of		Home			% of		Installment			% of		Consumer			% of		Total			% of
		Mortgage			Total		Equity			Total		and other			Total		Construction			Total					Total
												consumer
	Performing	$	490,471		99.6	%	$	414,795		99.7	%	$	65,812		99.9	%	$	3,541		100	%	$	974,619		99.6	%
	Nonperforming	2,118			0.4	%	1,431			0.3	%	26			0.1	%	—			—	%	3,575			0.4	%
Total	$	492,589		100	%	$	416,226		100	%	$	65,838		100	%	$	3,541		100	%	$	978,194		100	%
	December 31, 2013
(dollars in thousands)	Residential			% of		Home			% of		Installment			% of		Consumer			% of		Total			% of
	Mortgage			Total		Equity			Total		and other			Total		Construction			Total					Total
											consumer
Performing	$	483,754		99.3	%	$	411,904		99.4	%	$	67,846		99.9	%	$	3,149		100	%	$	966,653		99.4	%
Nonperforming	3,338			0.7	%	2,291			0.6	%	37			0.1	%	—			—	%	5,666			0.6	%
Total	$	487,092		100	%	$	414,195		100	%	$	67,883		100	%	$	3,149		100	%	$	972,319		100	%
We individually evaluate all substandard and nonaccrual commercial loans greater than $0.5 million for impairment. Loans are considered to be impaired when based upon current information and events it is probable that we will be unable to collect all principal and interest payments due according to the original contractual terms of the loan agreement. All TDRs are considered to be impaired loans and will be reported as an impaired loan for the remaining life of the loan, unless the restructuring agreement specifies an interest rate equal to or greater than the rate that would be accepted at the time of the restructuring for a new loan with comparable risk and it is expected that the remaining principal and interest will be fully collected according to the restructured agreement. For all TDRs, regardless of size, as well as all other impaired loans, we conduct further analysis to determine the probable loss and assign a specific reserve to the loan if deemed appropriate.
The following table presents investments in loans considered to be impaired and related information on those impaired loans for the periods presented:
	June 30, 2014									December 31, 2013
(dollars in thousands)	Recorded			Unpaid			Related			Recorded			Unpaid			Related
	Investment			Principal			Allowance			Investment			Principal			Allowance
				Balance									Balance
Without a related allowance recorded:
Commercial real estate	$	21,228		$	28,296		$	—		$	26,968		$	35,474		$	—
Commercial and industrial	9,545			9,660			—			9,580			9,703			—
Commercial construction	8,179			11,866			—			7,391			12,353			—
Consumer real estate	7,082			7,629			—			8,026			9,464			—
Other consumer	107			109			—			124			128			—
Total without a Related Allowance Recorded	46,141			57,560			—			52,089			67,122			—
With a related allowance recorded:
Commercial real estate	—			—			—			—			—			—
Commercial and industrial	—			—			—			—			—			—
Commercial construction	—			—			—			681			1,383			25
Consumer real estate	47			47			47			53			53			53
Other consumer	21			21			11			33			33			19
Total with a Related Allowance Recorded	68			68			58			767			1,469			97
Total:
Commercial real estate	21,228			28,296			—			26,968			35,474			—
Commercial and industrial	9,545			9,660			—			9,580			9,703			—
Commercial construction	8,179			11,866			—			8,072			13,736			25
Consumer real estate	7,129			7,676			47			8,079			9,517			53
Other consumer	128			130			11			157			161			19
Total	$	46,209		$	57,628		$	58		$	52,856		$	68,591		$	97
As of June 30, 2014, CRE loans of $21.2 million comprised 46 percent of the total impaired loans of $46.2 million. These impaired loans are collateralized primarily by commercial real estate properties such as retail or strip malls, office buildings and various other types of commercial purpose properties. These loans are generally considered collateral dependent and charge-offs are recorded when a confirmed loss exists. Approximately $7.9 million of charge-offs have been recorded relating to these CRE loans over the life of these loans. It is our policy to order appraisals on an annual basis on impaired loans or sooner if facts and circumstances warrant. As of June 30, 2014, an estimated fair value less cost to sell of approximately $34.7 million existed for CRE impaired loans. We have current appraisals on all but $0.6 million of the $21.2 million of impaired CRE loans. We have not ordered an appraisal on this loan due to an outstanding settlement agreement with the borrower which would result in the collection of the remaining recorded investment in the loan.
The following tables summarize investments in loans considered to be impaired and related information on those impaired loans for the periods presented:
	For the Three Months Ended
	June 30, 2014						June 30, 2013
(dollars in thousands)	Average			Interest			Average			Interest
	Recorded			Income			Recorded			Income
	Investment			Recognized			Investment			Recognized
Without a related allowance recorded:
Commercial real estate	$	21,382		$	159		$	30,956		$	174
Commercial and industrial	9,317			57			12,452			66
Commercial construction	8,279			57			16,376			87
Consumer real estate	7,166			100			8,708			156
Other consumer	109			1			114			2
Total without a Related Allowance Recorded	46,253			374			68,606			485
With a related allowance recorded:
Commercial real estate	—			—			2,084			—
Commercial and industrial	—			—			—			—
Commercial construction	—			—			—			—
Consumer real estate	48			1			86			4
Other consumer	22			—			28			1
Total with a Related Allowance Recorded	70			1			2,198			5
Total:
Commercial real estate	21,382			159			33,040			174
Commercial and industrial	9,317			57			12,452			66
Commercial construction	8,279			57			16,376			87
Consumer real estate	7,214			101			8,794			160
Other consumer	131			1			142			3
Total	$	46,323		$	375		$	70,804		$	490
	For the Six Months Ended
	June 30, 2014						June 30, 2013
(dollars in thousands)	Average			Interest			Average			Interest
	Recorded			Income			Recorded			Income
	Investment			Recognized			Investment			Recognized
Without a related allowance recorded:
Commercial real estate	$	21,980		$	329		$	31,181		$	415
Commercial and industrial	9,066			114			12,449			135
Commercial construction	8,301			114			16,854			221
Consumer real estate	7,260			203			9,194			215
Other consumer	112			2			106			2
Total without a Related Allowance Recorded	46,719			762			69,784			988
With a related allowance recorded:
Commercial real estate	$	—		$	—		3,282			$	—
Commercial and industrial	—			—			—			—
Commercial construction	—			—			—			—
Consumer real estate	50			2			43			4
Other consumer	23			1			14			1
Total with a Related Allowance Recorded	73			3			3,339			5
Total:
Commercial real estate	21,980			329			34,463			415
Commercial and industrial	9,066			114			12,449			135
Commercial construction	8,301			114			16,854			221
Consumer real estate	7,310			205			9,237			219
Other consumer	135			3			120			3
Total	$	46,792		$	765		$	73,123		$	993
The following tables detail activity in the ALL for the periods presented:
	Three Months Ended June 30, 2014
(dollars in thousands)	Commercial				Commercial and				Commercial				Consumer				Other				Total
	Real Estate				Industrial				Construction				Real Estate				Consumer				Loans
Balance at beginning of period	$	19,880			$	13,979			$	5,183			$	6,408			$	1,166			$	46,616
Charge-offs	(1,737		)		(743		)		(664		)		(425		)		(177		)		(3,746		)
Recoveries	1,294				2,936				324				164				126				4,844
Net Recoveries/ (Charge-offs)	(443		)		2,193				(340		)		(261		)		(51		)		1,098
Provision for loan losses	1,296				(3,168		)		(84		)		558				264				(1,134		)
Balance at End of Period	$	20,733			$	13,004			$	4,759			$	6,705			$	1,379			$	46,580
	Three Months Ended June 30, 2013
(dollars in thousands)	Commercial				Commercial and				Commercial				Consumer				Other				Total
	Real Estate				Industrial				Construction				Real Estate				Consumer				Loans
Balance at beginning of period	$	24,442			$	8,676			$	6,603			$	5,259			$	956			$	45,936
Charge-offs	(1,170		)		(563		)		(54		)		(743		)		(399		)		(2,929		)
Recoveries	1,572				190				2				225				86				2,075
Net (Charge-offs)/ Recoveries	402				(373		)		(52		)		(518		)		(313		)		(854		)
Provision for loan losses	(1,360		)		820				(739		)		1,914				388				1,023
Balance at End of Period	$	23,484			$	9,123			$	5,812			$	6,655			$	1,031			$	46,105
	Six Months Ended June 30, 2014
(dollars in thousands)	Commercial				Commercial and				Commercial				Consumer				Other				Total
	Real Estate				Industrial				Construction				Real Estate				Consumer				Loans
Balance at beginning of period	$	18,921			$	14,433			$	5,374			$	6,362			$	1,165			$	46,255
Charge-offs	(2,004		)		(1,033		)		(692		)		(547		)		(445		)		(4,721		)
Recoveries	1,834				3,249				375				223				210				5,891
Net Recoveries/ (Charge-offs)	(170		)		2,216				(317		)		(324		)		(235		)		1,170
Provision for loan losses	1,982				(3,645		)		(298		)		667				449				(845		)
Balance at End of Period	$	20,733			$	13,004			$	4,759			$	6,705			$	1,379			$	46,580
	Six Months Ended June 30, 2013
(dollars in thousands)	Commercial				Commercial and				Commercial				Consumer				Other				Total
	Real Estate				Industrial				Construction				Real Estate				Consumer				Loans
Balance at beginning of period	$	25,246			$	7,759			$	7,500			$	5,058			$	921			$	46,484
Charge-offs	(2,809		)		(1,923		)		(443		)		(1,237		)		(651		)		(7,063		)
Recoveries	2,322				290				55				508				179				3,354
Net (Charge-offs)/ Recoveries	(487		)		(1,633		)		(388		)		(729		)		(472		)		(3,709		)
Provision for loan losses	(1,275		)		2,997				(1,300		)		2,326				582				3,330
Balance at End of Period	$	23,484			$	9,123			$	5,812			$	6,655			$	1,031			$	46,105
The following tables present the ALL and recorded investments in loans by category as of June 30, 2014 and December 31, 2013:
	June 30, 2014
	Allowance for Loan Losses										Portfolio Loans
(dollars in thousands)	Individually			Collectively			Total				Individually			Collectively			Total
	Evaluated for			Evaluated for							Evaluated for			Evaluated for
	Impairment			Impairment							Impairment			Impairment
Commercial real estate	$	—		$	20,733		$	20,733			$	21,228		$	1,615,155		$	1,636,383
Commercial and industrial	—			13,004			13,004				9,545			912,646			922,191
Commercial construction	—			4,759			4,759				8,179			180,132			188,311
Consumer real estate	47			6,658			6,705				7,129			905,227			912,356
Other consumer	11			1,368			1,379				128			65,710			65,838
Total	$	58		$	46,522		$	46,580			$	46,209		$	3,678,870		$	3,725,079
	December 31, 2013
	Allowance for Loan Losses										Portfolio Loans
(dollars in thousands)	Individually			Collectively			Total				Individually			Collectively			Total
	Evaluated for			Evaluated for							Evaluated for			Evaluated for
	Impairment			Impairment							Impairment			Impairment
Commercial real estate	$	—		$	18,921		$	18,921			$	26,968		$	1,580,788		$	1,607,756
Commercial and industrial	—			14,433			14,433				9,580			832,869			842,449
Commercial construction	25			5,349			5,374				8,072			135,603			143,675
Consumer real estate	53			6,309			6,362				8,079			896,357			904,436
Other consumer	19			1,146			1,165				157			67,726			67,883
Total	$	97		$	46,158		$	46,255			$	52,856		$	3,513,343		$	3,566,199

Derivative_Instruments_and_Hed

Derivative Instruments and Hedging Activities	6 Months Ended
	Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative Instruments and Hedging Activities	'
	DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES
	Interest Rate Swaps
	Interest rate swaps are contracts in which a series of interest rate flows (fixed and variable) are exchanged over a prescribed period. The notional amounts on which the interest payments are based are not exchanged. These derivative positions relate to transactions in which we enter into an interest rate swap with a commercial customer while at the same time entering into an offsetting interest rate swap with another financial institution. In connection with each transaction, we agree to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on the same notional amount at a fixed rate. At the same time, we agree to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. The transaction allows our customer to effectively convert a variable rate loan to a fixed rate loan with us receiving a variable rate. These agreements could have floors or caps on the contracted interest rates.
	Pursuant to our agreements with various financial institutions, we may receive collateral or may be required to post collateral based upon mark-to-market positions. Beyond unsecured threshold levels, collateral in the form of cash or securities may be made available to counterparties of interest rate swap transactions. Based upon our current positions and related future collateral requirements relating to them, we believe any effect on our cash flow or liquidity position to be immaterial.
	Derivatives contain an element of credit risk, such as the possibility that we will incur a loss because a counterparty, which may be a financial institution or a customer, fails to meet its contractual obligations. All derivative contracts with financial institutions may be executed only with counterparties approved by our Asset and Liability Committee, or ALCO, and derivatives with customers may only be executed with customers within credit exposure limits approved by our Senior Loan Committee. Interest rate swaps are considered derivatives, but are not accounted for using hedge accounting. As such, changes in the fair value of the derivatives are recorded in current earnings and included in other noninterest income in the Consolidated Statements of Comprehensive Income.
	Interest Rate Lock Commitments and Forward Sale Contracts
	In the normal course of business, we sell originated mortgage loans into the secondary mortgage loan market. We also offer interest rate lock commitments to potential borrowers. The commitments are generally for 60 days and guarantee a specified interest rate for a loan if underwriting standards are met, but the commitment does not obligate the potential borrower to close on the loan. Accordingly, some commitments expire prior to becoming loans. We can encounter pricing risk if interest rates increase significantly before the loan can be closed and sold. We may utilize forward sale contracts in order to mitigate this pricing risk. Whenever a customer desires these products, a mortgage originator quotes a secondary market rate guaranteed for that day by the investor. The rate lock is executed between the mortgagee and us and in turn a forward sale contract may be executed between us and the investor. Both the interest rate lock commitment and the corresponding forward sale contract for each customer are considered derivatives, but are not accounted for using hedge accounting. As such, changes in the fair value of the derivatives during the commitment period are recorded in current earnings and included in mortgage banking in the Consolidated Statements of Comprehensive Income.
	The following table indicates the amounts representing the value of derivative assets and derivative liabilities as of the dates presented:
		Derivatives						Derivatives
		(included in Other Assets)						(included in Other Liabilities)
	(dollars in thousands)	June 30, 2014			December 31, 2013			June 30, 2014			December 31, 2013
	Derivatives not Designated as Hedging Instruments
	Interest Rate Swap Contracts—Commercial Loans
	Fair value	$	14,082		$	13,698		$	14,050		$	13,647
	Notional amount	245,865			261,754			245,865			261,754
	Collateral posted	—			—			11,559			12,611
	Interest Rate Lock Commitments—Mortgage Loans
	Fair value	292			85			—			—
	Notional amount	9,594			3,989			—			—
	Forward Sale Contracts—Mortgage Loans
	Fair value	—			34			59			—
	Notional amount	$	—		$	5,250		$	7,210		$	—
	Presenting offsetting derivatives that are subject to legally enforceable netting arrangements with the same party is permitted. For example, we may have a derivative asset as well as a derivative liability with the same counterparty to a swap transaction and are permitted to offset the asset position and the liability position resulting in a net presentation.
	The following table indicates the gross amounts of commercial loan swap derivative assets and derivative liabilities, the amounts offset and the carrying values in the Consolidated Balance Sheets as of the dates presented:
		Derivatives						Derivatives
		(included in Other Assets)						(included in Other Liabilities)
	(dollars in thousands)	June 30, 2014			December 31, 2013			June 30, 2014			December 31, 2013
	Derivatives not Designated as Hedging Instruments
	Gross amounts recognized	$	14,349		$	14,012		$	14,317		$	13,961
	Gross amounts offset	(267		)	(314		)	(267		)	(314		)
	Net amounts presented in the Consolidated Balance Sheets	14,082			13,698			14,050			13,647
	Gross amounts not offset(1)	—			—			(11,559		)	(12,611		)
	Net Amount	$	14,082		$	13,698		$	2,491		$	1,036
	(1) Amounts represent posted collateral.
	The following table indicates the gain or loss recognized in income on derivatives for the periods presented:
		Three Months Ended June 30,						Six Months Ended June 30,
	(dollars in thousands)	2014			2013			2014			2013
	Derivatives not Designated as Hedging Instruments
	Interest rate swap contracts—commercial loans	$	(11	)	$	(27	)	$	(19	)	$	(156	)
	Interest rate lock commitments—mortgage loans	199			(266		)	207			(492		)
	Forward sale contracts—mortgage loans	(64		)	381			(93		)	405
	Total Derivatives Gain (Loss)	$	124		$	88		$	95		$	(243	)

Borrowings

Borrowings	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Borrowings	'
	BORROWINGS
	Short-term borrowings are for terms under one year and were comprised of securities sold under repurchase agreements, or REPOs, and Federal Home Loan Bank, or FHLB, advances. Our REPOs were with our local retail customers. Securities pledged as collateral under these REPO financing arrangements cannot be sold or repledged by the secured party and are therefore accounted for as a secured borrowing. FHLB advances are for various terms secured by a blanket lien on our residential mortgages and other real estate secured loans.
	Long-term borrowings are for original terms greater than one year and were comprised of FHLB advances, a capital lease and junior subordinated debt securities. Long-term FHLB advances have the same collateral requirements as their short-term equivalents. We had total long-term borrowings outstanding of $17.3 million at a fixed rate and $48.7 million at a variable rate at June 30, 2014, excluding our capital lease of $0.2 million.
	Information pertaining to borrowings is summarized in the table below as of the dates presented:
		June 30, 2014				December 31, 2013
	(dollars in thousands)	Balance		Weighted		Balance		Weighted
				Average Rate				Average Rate
	Short-term borrowings
	Securities sold under repurchase agreements	$	25,269	0.01	%	$	33,847	0.01	%
	Short-term borrowings	185,000		0.28	%	140,000		0.3	%
	Total short-term borrowings	210,269		0.25	%	173,847		0.24	%
	Long-term borrowings
	Other long-term borrowings	20,636		2.98	%	21,810		3.01	%
	Junior subordinated debt securities	45,619		2.69	%	45,619		2.7	%
	Total long-term borrowings	66,255		2.78	%	67,429		2.8	%
	Total Borrowings	$	276,524	0.85	%	$	241,276	0.96	%
	We had total borrowings at June 30, 2014 and December 31, 2013 at the FHLB of Pittsburgh of $205.4 million and $161.6 million. This consisted of $185.0 million in short-term borrowings and $20.4 million in long-term borrowings at June 30, 2014. Our maximum borrowing capacity with the FHLB of Pittsburgh was $1.6 billion at June 30, 2014, with a remaining borrowing availability of $1.4 billion.

Commitments_and_Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	COMMITMENTS AND CONTINGENCIES
	Commitments
	In the normal course of business, we offer off-balance sheet credit arrangements to enable our customers to meet their financing objectives. These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the financial statements. Our exposure to credit loss, in the event a customer does not satisfy the terms of their agreement, equals the contractual amount of the obligation less the value of any collateral. We apply the same credit policies in making commitments and standby letters of credit that are used for the underwriting of loans to customers. Commitments generally have fixed expiration dates, annual renewals or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon; the total commitment amounts do not necessarily represent future cash requirements. Our allowance for unfunded commitments totaled $3.1 million at June 30, 2014 and $2.9 million at December 31, 2013. The allowance for unfunded commitments is included in other liabilities in the Consolidated Balance Sheets.
	Estimates of the fair value of these off-balance sheet items were not made because of the short-term nature of these arrangements and the credit standing of the counterparties.
	The following table sets forth the commitments and letters of credit as of the dates presented:
	(dollars in thousands)	June 30, 2014		December 31, 2013
	Commitments to extend credit	$	1,117,511	$	1,038,529
	Standby letters of credit	78,427		78,639
	Total	$	1,195,938	$	1,117,168
	Litigation
	In the normal course of business, we are subject to various legal and administrative proceedings and claims. While any type of litigation contains a level of uncertainty, we believe that the outcome of such proceedings or claims will not have a material adverse effect on our consolidated financial position.

Other_Comprehensive_Income

Other Comprehensive Income	6 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Other Comprehensive Income	'
	OTHER COMPREHENSIVE INCOME
	The following table presents the tax effects of the components of other comprehensive income (loss) for the periods presented:
		Three Months Ended June 30, 2014									Three Months Ended June 30, 2013
	(dollars in thousands)	Pre-Tax			Tax			Net of Tax			Pre-Tax			Tax			Net of Tax
		Amount			(Expense)			Amount			Amount			(Expense)			Amount
					Benefit									Benefit
	Change in unrealized gains/losses on securities available-for-sale	$	5,401		$	(1,891	)	$	3,510		$	(12,061	)	$	4,221		$	(7,840	)
	Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income (1)	(40		)	15			(25		)	—			—			—
	Adjustment to funded status of employee benefit plans	211			(74		)	137			598			(210		)	388
	Other Comprehensive Income (Loss)	$	5,572		$	(1,950	)	$	3,622		$	(11,463	)	$	4,011		$	(7,452	)
	(1) Reclassification adjustments are comprised of realized security gains. The gains have been reclassified out of accumulated other comprehensive income (loss) and have affected certain lines in the Consolidated Statements of Comprehensive Income as follows; the pre-tax amount is included in securities gains-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.
		Six Months Ended June 30, 2014									Six Months Ended June 30, 2013
	(dollars in thousands)	Pre-Tax			Tax			Net of Tax			Pre-Tax			Tax			Net of Tax
		Amount			(Expense)			Amount			Amount			(Expense)			Amount
					Benefit									Benefit
	Change in unrealized gains/losses on securities available-for-sale	$	9,876		$	(3,457	)	$	6,419		$	(13,829	)	$	4,840		$	(8,989	)
	Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income (1)	(41		)	15			(26		)	(2		)	1			(1		)
	Adjustment to funded status of employee benefit plans	423			(148		)	275			1,196			(419		)	777
	Other Comprehensive Income (Loss)	$	10,258		$	(3,590	)	$	6,668		$	(12,635	)	$	4,422		$	(8,213	)
	(1) Reclassification adjustments are comprised of realized security gains. The gains have been reclassified out of accumulated other comprehensive income and have affected certain lines in the consolidated statement of comprehensive income as follows; the pre-tax amount is included in securities gains-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.

Employee_Benefits

Employee Benefits	6 Months Ended
	Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]	'
Employee Benefits	'
	We maintain a defined benefit pension plan, or Plan, covering substantially all employees hired prior to January 1, 2008. The benefits are based on years of service and the employee’s compensation for the highest five consecutive years in the last ten years. Contributions are intended to provide for benefits attributed to employee service to date and for those benefits expected to be earned in the future. At this time, we are not required to make a cash contribution to the Plan in 2014. The expected long-term rate of return on plan assets is 8.00 percent. Through June 30, 2014, there have been no changes to the Plan.
	The following table summarizes the components of net periodic pension cost for the periods presented:
		Three Months Ended June 30,						Six Months Ended June 30,
	(dollars in thousands)	2014			2013			2014			2013
	Components of Net Periodic Pension Cost
	Service cost—benefits earned during the period	$	631		$	708		$	1,262		$	1,416
	Interest cost on projected benefit obligation	1,106			996			2,212			1,992
	Expected return on plan assets	(1,735		)	(1,565		)	(3,470		)	(3,130		)
	Amortization of prior service cost (credit)	(35		)	(34		)	(70		)	(68		)
	Recognized net actuarial loss	209			588			418			1,176
	Net Periodic Pension Expense	$	176		$	693		$	352		$	1,386

Segments

Segments	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Segments	'
	SEGMENTS
	We manage three reportable operating segments including Community Banking, Insurance and Wealth Management.
	•	Our Community Banking segment offers services which include accepting time and demand deposit accounts, originating commercial and consumer loans and providing letters of credit and credit card services.
	•	Our Insurance segment includes a full-service insurance agency offering commercial property and casualty insurance, group life and health coverage, employee benefit solutions and personal insurance lines.
	•	Our Wealth Management segment offers discount brokerage services, services as executor and trustee under wills and deeds, guardian and custodian of employee benefits and other trust and brokerage services, as well as a registered investment advisor that manages private investment accounts for individuals and institutions.
	The following table represents total assets by reportable operating segment as of the dates presented:
	(dollars in thousands)	June 30, 2014				December 31, 2013
	Community Banking	$	4,778,233			$	4,524,939
	Insurance	7,715				6,926
	Wealth Management	2,082				1,325
	Total Assets	$	4,788,030			$	4,533,190
	The following tables provide financial information for our three segments for the three and six month periods ended June 30, 2014 and 2013. The financial results of the business segments include allocations for shared services based on an internal analysis that supports line of business performance measurement. Shared services include expenses such as employee benefits, occupancy expense, computer support and corporate overhead. Even with these allocations, the financial results are not necessarily indicative of the business segments’ financial condition and results of operations if they existed as independent entities. The information provided under the caption “Eliminations” represents operations not considered to be reportable segments and/or general operating expenses and eliminations and adjustments, which are necessary for purposes of reconciling to the Consolidated Financial Statements.
		Three Months Ended June 30, 2014
	(dollars in thousands)	Community			Insurance			Wealth Management		Eliminations			Consolidated
		Banking
	Interest income	$	39,845		$	—		$	136	$	(109	)	$	39,872
	Interest expense	3,415			—			—		(398		)	3,017
	Net interest income	36,430			—			136		289			36,855
	Provision for loan losses	(1,134		)	—			—		—			(1,134		)
	Noninterest income	7,522			1,245			2,828		176			11,771
	Noninterest expense	25,092			1,044			2,442		465			29,043
	Depreciation expense	805			13			7		—			825
	Amortization of intangible assets	274			13			10		—			297
	Provision for income taxes	4,637			61			177		—			4,875
	Net Income	$	14,278		$	114		$	328	$	—		$	14,720
		Three Months Ended June 30, 2013
	(dollars in thousands)	Community			Insurance			Wealth Management		Eliminations			Consolidated
		Banking
	Interest income	$	38,505		$	—		$	135	$	(87	)	$	38,553
	Interest expense	4,663			—			—		(706		)	3,957
	Net interest income	33,842			—			135		619			34,596
	Provision for loan losses	1,023			—			—		—			1,023
	Noninterest income	8,467			1,349			2,812		239			12,867
	Noninterest expense	21,786			1,105			2,389		1,797			27,077
	Depreciation expense	876			12			8		—			896
	Amortization of intangible assets	387			13			13		—			413
	Provision (benefit) for income taxes	4,592			77			221		(939		)	3,951
	Net Income	$	13,645		$	142		$	316	$	—		$	14,103
		Six Months Ended June 30, 2014
	(dollars in thousands)	Community			Insurance			Wealth		Eliminations			Consolidated
		Banking						Management
	Interest income	$	78,475		$	—		$	310	$	(248	)	$	78,537
	Interest expense	6,897			—			—		(806		)	6,091
	Net interest income	71,578			—			310		558			72,446
	Provision for loan losses	(845		)	—			—		—			(845		)
	Noninterest income	14,375			2,766			5,764		282			23,187
	Noninterest expense	49,066			2,199			4,716		840			56,821
	Depreciation expense	1,607			25			13		—			1,645
	Amortization of intangible assets	566			25			22		—			613
	Provision for income taxes	8,002			181			463		—			8,646
	Net Income	$	27,557		$	336		$	860	$	—		$	28,753
		Six Months Ended June 30, 2013
	(dollars in thousands)	Community			Insurance			Wealth		Eliminations			Consolidated
		Banking						Management
	Interest income	$	76,194		$	1		$	273	$	(72	)	$	76,396
	Interest expense	9,454			—			—		(1,323		)	8,131
	Net interest income	66,740			1			273		1,251			68,265
	Provision for loan losses	3,330			—			—		—			3,330
	Noninterest income	18,823			2,947			5,386		517			27,673
	Noninterest expense	46,427			2,552			4,878		3,468			57,325
	Depreciation expense	1,795			22			16		—			1,833
	Amortization of intangible assets	792			26			26		—			844
	Provision (benefit) for income taxes	7,438			122			313		(1,700		)	6,173
Net Income	$	25,781		$	226		$	426	$	—		$	26,433

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Principles of Consolidation	'
	Principles of Consolidation
	The interim Consolidated Financial Statements include the accounts of S&T Bancorp, Inc., or S&T, and its wholly owned subsidiaries. All significant intercompany transactions have been eliminated in consolidation. Investments of 20 percent to 50 percent of the outstanding common stock of investees are accounted for using the equity method of accounting.
Basis of Presentation	'
	Basis of Presentation
	The accompanying unaudited interim Consolidated Financial Statements of S&T have been prepared in accordance with generally accepted accounting principles, or GAAP, in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our annual report on Form 10-K for the year ended December 31, 2013, filed with the Securities and Exchange Commission, or SEC, on February 21, 2014. In the opinion of management, the accompanying interim financial information reflects all adjustments, including normal recurring adjustments, necessary to present fairly our financial position and the results of operations for each of the interim periods presented. Results of operations for interim periods are not necessarily indicative of the results of operations that may be expected for a full year or any future period.
Reclassification	'
	Reclassification
	Certain amounts in the prior periods’ financial statements and footnotes have been reclassified to conform to the current period’s presentation. The reclassifications had no significant effect on our results of operations or financial condition.
Use of Estimates	'
	Use of Estimates
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates.
Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Tax Credit Carry Forward Exists	'
	Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Tax Credit Carry forward Exists
	In July 2013, the Financial Accounting Standards Board (FASB) issued ASU No. 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Tax Credit Carry forward Exists. The ASU requires that entities should present an unrecognized tax benefit as a reduction of the deferred tax asset for a net operating loss, or NOL, or similar tax loss or tax credit carry forward rather than as a liability when the uncertain tax position would reduce the NOL or other carry forward under the tax law. The new standard is effective for fiscal years, and interim periods within those years, beginning after December 15, 2013, and should be applied prospectively to all unrecognized tax benefits that exist at the effective date. Retrospective application is permitted. The adoption of this ASU had no impact on our results of operations or financial position.
Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation is Fixed at the Reporting Date	'
	Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation is Fixed at the Reporting Date
	In February 2013, the FASB issued ASU No. 2013-04, Obligations Resulting from Joint and Several Liability Arrangements for Which the Total Amount of the Obligation is Fixed at the Reporting Date. The ASU requires the measurement of obligations resulting from joint and several liability arrangements for which the total amount of the obligation is fixed at the reporting date as the sum of the amount the reporting entity agreed to pay on the basis of its arrangement with its co-obligors as well as any additional amount that the entity expects to pay on behalf of its co-obligors. The new standard is effective retrospectively for fiscal years and interim periods within those years, beginning after December 15, 2013, and early adoption is permitted. The adoption of this ASU had no impact on our results of operations or financial position.
New Accounting Pronouncements	'
	Recently Issued Accounting Standards Updates not yet Adopted
	Share-Based Payment Awards with Performance Targets
	In June 2014, the FASB issued ASU No. 2014-12, Share-Based Payment Awards with Performance Targets. The main provisions of ASU 2014-12 require that a performance target included in a share-based payment award that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. Therefore, under the existing stock compensation guidance in Topic 718, the performance target should not be reflected in estimating the grant-date fair value of the award. The standard is effective for annual periods and interim periods beginning after December 15, 2015. We do not expect that this ASU will have a material impact on our results of operations or financial position.
	Repurchase-To-Maturity Transactions, Repurchase Financings and New Disclosures
	In June 2014, the FASB issued ASU No. 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and New Disclosures to change the accounting for repurchase-to-maturity transactions and certain linked repurchase financings. This will result in accounting for both types of arrangements as secured borrowings on the balance sheet and require new disclosures to (i) increase transparency about the types of collateral pledged in secured borrowing transactions and (ii) enable users to better understand transactions in which the transferor retains substantially all of the exposure to the economic return on the transferred financial asset throughout the term of the transaction. The disclosure for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions accounted for as secured borrowings is required to be presented for annual periods beginning after December 15, 2014, and for interim periods beginning after March 15, 2015. All other accounting and disclosure amendments in the ASU are effective for the first interim or annual period beginning after December 15, 2014. Earlier application for a public business entity is prohibited. We do not expect that this ASU will have a material impact on our results of operations or financial position.
	Revenues from Contracts with Customers
	In May 2014, the FASB issued ASU No. 2014-09, Revenues from Contracts with Customers. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. The standard is required to be adopted by public business entities in annual periods beginning on or after December 15, 2016. The provisions do not apply to lease contracts, insurance contracts, financial instruments and other contractual rights or obligations (e.g. receivables, debt and equity securities, liabilities, debt, derivatives transfers, and servicing, etc.), guarantees, or non-monetary exchanges between entities. We are currently evaluating the impact of the adoption of this pronouncement on our consolidated financial statements.
	Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity
	In April 2014, the FASB issued ASU No. 2014-08, Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity, which changes the criteria for determining which disposals can be presented as discontinued operations and modifies related disclosure requirements. The guidance applies to all entities that dispose of components. It will significantly change current practices for assessing discontinued operations and affect an entity’s income and earnings per share from continuing operations. An entity is required to reclassify assets and liabilities of a discontinued operation that are classified as held for sale or disposed of in the current period for all comparative periods presented. The ASU requires that an entity present in the statement of cash flows or disclose in a note either total operating and investing cash flows for discontinued operations, or depreciation, amortization, capital expenditures and significant operating and investing noncash items related to discontinued operations. Additional disclosures are required when an entity retains significant continuing involvement with a discontinued operation after its disposal, including the amount of cash flows to and from a discontinued operation. The new standard applies prospectively after the effective date of December 15, 2014, and early adoption is permitted. We do not expect that this ASU will have a material impact on our results of operations or financial position.
	Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure
	In January 2014, the FASB issued ASU No. 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure. The ASU clarifies that an in substance repossession or foreclosure has occurred and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure. Interim and annual disclosure is required of both the amount of foreclosed residential real estate property held by the creditor and the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure. The new standard is effective using either the modified retrospective transition method or a prospective transition method for fiscal years and interim periods within those years, beginning after December 15, 2014, and early adoption is permitted. We do not expect that this ASU will have a material impact on our results of operations or financial position.
	Accounting for Investments in Qualified Affordable Housing Projects
	In January 2014, the FASB issued ASU No. 2014-01, Accounting for Investments in Qualified Affordable Housing Projects. The ASU permits reporting entities to make an accounting policy election to account for investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. The proportional amortization method permits the amortization of the initial cost of the investment in proportion to the tax credits and other tax benefits received, and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). The new standard is effective retrospectively for fiscal years and interim periods within those years, beginning after December 15, 2014, and early adoption is permitted. We do not expect that this ASU will have a material impact on our results of operations or financial position.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Reconciles Numerators and Denominators of Basic Earnings Per Share with Diluted Earnings Per Share	'
	The following table reconciles the numerators and denominators of basic earnings per share with that of diluted earnings per share for the periods presented:
		Three Months Ended June 30,				Six Months Ended June 30,
	(dollars in thousands, except shares and per share data)	2014		2013		2014		2013
	Numerator for Earnings per Share—Basic:
	Net income	$	14,720	$	14,103	$	28,753	$	26,433
	Less: Income allocated to participating shares	29		36		64		81
	Net Income Allocated to Shareholders	$	14,691	$	14,067	$	28,689	$	26,352
	Numerator for Earnings per Share—Diluted:
	Net income	14,720		14,103		$	28,753	$	26,433
	Net Income Available to Shareholders	$	14,720	$	14,103	$	28,753	$	26,433
	Denominators for Earnings per Share:
	Weighted Average Shares Outstanding—Basic	29,684,300		29,654,018		29,672,611		29,637,825
	Add: Dilutive potential shares	16,894		23,858		27,559		41,319
	Denominator for Treasury Stock Method—Diluted	29,701,194		29,677,876		29,700,170		29,679,144
	Weighted Average Shares Outstanding—Basic	29,684,300		29,654,018		29,672,611		29,637,825
	Add: Average participating shares outstanding	58,973		74,994		66,563		91,530
	Denominator for Two-Class Method—Diluted	29,743,273		29,729,012		29,739,174		29,729,355
	Earnings per share—basic	$	0.49	$	0.47	$	0.97	$	0.89
	Earnings per share—diluted	$	0.49	$	0.47	$	0.97	$	0.89
	Warrants considered anti-dilutive excluded from dilutive potential shares	517,012		517,012		517,012		517,012
	Stock options considered anti-dilutive excluded from dilutive potential shares	428,493		629,570		428,676		642,499
	Restricted stock considered anti-dilutive excluded from dilutive potential shares	42,079		51,136		39,005		50,211

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Assets and Liabilities Measured at Fair Value on Recurring Basis	'
	The following tables present our assets and liabilities that are measured at fair value on a recurring basis by fair value hierarchy level at June 30, 2014 and December 31, 2013. There were no transfers between Level 1 and Level 2 for items measured at fair value on a recurring basis during the periods presented.
		30-Jun-14
	(dollars in thousands)	Level 1		Level 2			Level 3			Total
	ASSETS
	Securities available-for-sale:
	Obligations of U.S. government corporations and agencies	$	—	$	270,248		$	—		$	270,248
	Collateralized mortgage obligations of U.S. government corporations and agencies	—		94,604			—			94,604
	Residential mortgage-backed securities of U.S. government corporations and agencies	—		46,389			—			46,389
	Commercial mortgage-backed securities of U.S. government corporations and agencies	—		39,920			—			39,920
	Obligations of states and political subdivisions	—		128,313			—			128,313
	Marketable equity securities	179		8,835			—			9,014
	Total securities available-for-sale	179		588,309			—			588,488
	Trading securities held in a Rabbi Trust	3,117		—			—			3,117
	Total securities	3,296		588,309			—			591,605
	Derivative financial assets:
	Interest rate swaps	—		14,082			—			14,082
	Interest rate lock commitments	—		292			—			292
	Forward sale contracts	—		—			—			—
	Total Assets	$	3,296	$	602,683		$	—		$	605,979
	LIABILITIES
	Derivative financial liabilities:
	Interest rate swaps	$	—	$	14,050		$	—		$	14,050
	Forward sale contracts	—		59			—			$	59
	Total Liabilities	$	—	$	14,109		$	—		$	14,109
		December 31, 2013
	(dollars in thousands)	Level 1		Level 2			Level 3			Total
	ASSETS
	Securities available-for-sale:
	Obligations of U.S. government corporations and agencies	$	—	$	234,751		$	—		$	234,751
	Collateralized mortgage obligations of U.S. government corporations and agencies	—		63,774			—			63,774
	Residential mortgage-backed securities of U.S. government corporations and agencies	—		48,669			—			48,669
	Commercial mortgage-backed securities of U.S. government corporations and agencies	—		39,052			—			39,052
	Obligations of states and political subdivisions	—		114,264			—			114,264
	Marketable equity securities	202		8,713			—			8,915
	Total securities available-for-sale	202		509,223			—			509,425
	Trading securities held in a Rabbi Trust	2,864		—			—			2,864
	Total securities	3,066		509,223			—			512,289
	Derivative financial assets:
	Interest rate swaps	—		13,698			—			13,698
	Interest rate lock commitments	—		85			—			85
	Forward sale contracts	—		34			—			34
	Total Assets	$	3,066	$	523,040		$	—		$	526,106
	LIABILITIES
	Derivative financial liabilities:
	Interest rate swaps	$	—	$	13,647		$	—		$	13,647
	Total Liabilities	$	—	$	13,647		$	—		$	13,647
Changes in Assets Classified as Level 3 in Fair Value Hierarchy	'
	The following table presents the changes in assets measured at fair value on a recurring basis for which we have utilized Level 3 inputs to determine the fair value:
		Three Months Ended June 30,						Six Months Ended June 30,
	(dollars in thousands)	2014		2013				2014			2013
	Balance at beginning of period	$	—	$	312			$	—		$	300
	Total gains included in other comprehensive income(1)	—		32				—			44
	Net purchases, sales, issuances and settlements	—		—				—			—
	Transfers out of Level 3	—		(344		)		—			(344		)
	Balance at end of period	$	—	$	—			$	—		$	—
	(1) Changes in estimated fair value of available-for-sale investments are recorded in accumulated other comprehensive income (loss), while realized gains and losses from sales are recorded in security gains (losses), net in the Consolidated Statements of Comprehensive Income.
Assets Measured at Estimated Fair Value on Nonrecurring Basis by Fair Value Hierarchy	'
		June 30, 2014												December 31, 2013
	(dollars in thousands)	Level 1		Level 2			Level 3			Total				Level 1		Level 2		Level 3		Total
	ASSETS
	Loans held for sale	$	—	$	—		$	1,300		$	1,300			$	—	$	—	$	1,516	$	1,516
	Impaired loans	—		—			14,483			14,483				—		—		19,197		19,197
	Other real estate owned	—		—			317			317				—		—		317		317
	Mortgage servicing rights	—		—			1,211			1,211				—		—		1,025		1,025
	Total Assets	$	—	$	—		$	17,311		$	17,311			$	—	$	—	$	22,055	$	22,055
Carrying Values and Fair Values of Financial Instruments	'
	The carrying values and fair values of our financial instruments at June 30, 2014 and December 31, 2013 are presented in the following tables:
		Carrying		Fair Value Measurements at June 30, 2014
	(dollars in thousands)	Value(1)		Total			Level 1			Level 2			Level 3
	ASSETS
	Cash and due from banks, including interest-bearing deposits	$	130,235	$	130,235		$	130,235		$	—		$	—
	Securities available-for-sale	588,488		588,488			179			588,309			—
	Loans held for sale	3,102		3,121			—			—			3,121
	Portfolio loans, net of unearned income	3,725,079		3,691,807			—			—			3,691,807
	Bank owned life insurance	61,348		61,348			—			61,348			—
	FHLB and other restricted stock	15,818		15,818			—			—			15,818
	Trading securities held in a Rabbi Trust	3,117		3,117			3,117			—			—
	Mortgage servicing rights	2,743		2,890			—			—			2,890
	Interest rate swaps	14,082		14,082			—			14,082			—
	Interest rate lock commitments	292		292			—			292			—
	LIABILITIES
	Deposits	$	3,865,246	$	3,867,540		$	—		$	—		$	3,867,540
	Securities sold under repurchase agreements	25,269		25,269			—			—			25,269
	Short-term borrowings	185,000		185,000			—			—			185,000
	Long-term borrowings	20,636		21,779			—			—			21,779
	Junior subordinated debt securities	45,619		45,619			—			—			45,619
	Interest rate swaps	14,050		14,050			—			14,050			—
	Forward sale contracts	59		59			—			59			—
	(1) As reported in the Consolidated Balance Sheets
		Carrying		Fair Value Measurements at December 31, 2013
	(dollars in thousands)	Value(1)		Total			Level 1			Level 2			Level 3
	ASSETS
	Cash and due from banks, including interest-bearing deposits	$	108,356	$	108,356		$	108,356		$	—		$	—
	Securities available-for-sale	509,425		509,425			202			509,223			—
	Loans held for sale	2,136		2,139			—			—			2,139
	Portfolio loans, net of unearned income	3,566,199		3,538,072			—			—			3,538,072
	Bank owned life insurance	60,480		60,480			—			60,480			—
	FHLB and other restricted stock	13,629		13,629			—			—			13,629
	Trading securities held in a Rabbi Trust	2,864		2,864			2,864			—			—
	Mortgage servicing rights	2,919		3,143			—			—			3,143
	Interest rate swaps	13,698		13,698			—			13,698			—
	Interest rate lock commitments	85		85			—			85			—
	Forward sale contracts	34		34			—			34			—
	LIABILITIES
	Deposits	$	3,672,308	$	3,673,624		$	—		$	—		$	3,673,624
	Securities sold under repurchase agreements	33,847		33,847			—			—			33,847
	Short-term borrowings	140,000		140,000			—			—			140,000
	Long-term borrowings	21,810		22,924			—			—			22,924
	Junior subordinated debt securities	45,619		45,619			—			—			45,619
	Interest rate swaps	13,647		13,647			—			13,647			—
	(1) As reported in the Consolidated Balance Sheets

Securities_AvailableforSale_Ta

Securities Available-for-Sale (Tables)	6 Months Ended
	Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Composition of Securities Available-for-Sale	'
	The following table indicates the composition of the securities available-for-sale portfolio as of the dates presented:
		June 30, 2014													December 31, 2013
	(dollars in thousands)	Amortized			Gross			Gross			Fair				Amortized			Gross			Gross			Fair
		Cost			Unrealized			Unrealized			Value				Cost			Unrealized			Unrealized			Value
					Gains			Losses										Gains			Losses
	Obligations of U.S. government corporations and agencies	$	268,614		$	2,733		$	(1,099	)	$	270,248			$	235,181		$	2,151		$	(2,581	)	$	234,751
	Collateralized mortgage obligations of U.S. government corporations and agencies	93,787			1,035			(218		)	94,604				63,776			601			(603		)	63,774
	Residential mortgage-backed securities of U.S. government corporations and agencies	44,900			1,720			(231		)	46,389				47,934			1,420			(685		)	48,669
	Commercial mortgage-backed securities of U.S. government corporations and agencies	40,098			224			(402		)	39,920				40,357			—			(1,305		)	39,052
	Obligations of states and political subdivisions	124,648			4,017			(352		)	128,313				115,572			1,294			(2,602		)	114,264
	Debt Securities	572,047			9,729			(2,302		)	579,474				502,820			5,466			(7,776		)	500,510
	Marketable equity securities	7,579			1,435			—			9,014				7,579			1,336			—			8,915
	Total	$	579,626		$	11,164		$	(2,302	)	$	588,488			$	510,399		$	6,802		$	(7,776	)	$	509,425
Schedule of Realized Gain (Loss)	'
	Realized gains and losses on the sale of securities are determined using the specific-identification method. The following table shows the composition of gross and net realized gains and losses for the periods presented:
		Three Months Ended June 30,								Six Months Ended June 30,
	(dollars in thousands)	2014				2013				2014				2013
	Gross realized gains	$	40			$	—			$	41			$	2
	Gross realized losses	—				—				—				—
	Net Realized Gains	$	40			$	—			$	41			$	2
Fair Value and Age of Gross Unrealized Losses by Investment Category	'
	The following tables indicate the fair value and the age of gross unrealized losses by investment category as of the dates presented:
		June 30, 2014
		Less Than 12 Months								12 Months or More								Total
	(dollars in thousands)	Number of Securities	Fair Value			Unrealized				Number of Securities	Fair Value			Unrealized				Fair Value			Number of Securities	Unrealized
						Losses								Losses								Losses
	Obligations of U.S. government corporations and agencies	2	$	19,741		$	(78	)		8	$	63,265		$	(1,021	)		$	83,006		10	$	(1,099	)
	Collateralized mortgage obligations of U.S. government corporations and agencies	1	11,420			(218		)		—	—			—				11,420			1	(218		)
	Residential mortgage-backed securities of U.S. government corporations and agencies	—	—			—				1	9,414			(231		)		9,414			1	(231		)
	Commercial mortgage-backed securities of U.S. government corporations and agencies	1	10,009			(16		)		2	20,837			(386		)		30,846			3	(402		)
	Obligations of states and political subdivisions	1	264			(1		)		3	15,975			(351		)		16,239			4	(352		)
	Debt Securities	5	41,434			(313		)		14	109,491			(1,989		)		150,925			19	(2,302		)
	Marketable equity securities	—	—			—				—	—			—				—			—	—
	Total Temporarily Impaired Securities	5	$	41,434		$	(313	)		14	$	109,491		$	(1,989	)		$	150,925		19	$	(2,302	)
		December 31, 2013
		Less Than 12 Months								12 Months or More								Total
	(dollars in thousands)	Number of Securities	Fair Value			Unrealized				Number of Securities	Fair Value			Unrealized				Fair Value			Number of Securities	Unrealized
						Losses								Losses								Losses
	Obligations of U.S. government corporations and agencies	16	$	126,017		$	(2,581	)		—	$	—		$	—			$	126,017		16	$	(2,581	)
	Collateralized mortgage obligations of U.S. government corporations and agencies	3	39,522			(603		)		—	—			—				39,522			3	(603		)
	Residential mortgage-backed securities of U.S. government corporations and agencies	2	22,822			(685		)		—	—			—				22,822			2	(685		)
	Commercial mortgage-backed securities of U.S. government corporations and agencies	4	39,052			(1,305		)		—	—			—				39,052			4	(1,305		)
	Obligations of states and political subdivisions	16	47,529			(1,739		)		2	10,088			(863		)		57,617			18	(2,602		)
	Debt Securities	41	274,942			(6,913		)		2	10,088			(863		)		285,030			43	(7,776		)
	Marketable equity securities	—	—			—				—	—			—				—			—	—
	Total Temporarily Impaired Securities	41	$	274,942		$	(6,913	)		2	$	10,088		$	(863	)		$	285,030		43	$	(7,776	)
Unrealized Gains and Losses, Net of Tax on Securities Available for Sale	'
	The following table displays net unrealized gains and losses, net of tax on securities available for sale included in accumulated other comprehensive income/(loss) for the periods presented.
		30-Jun-14										31-Dec-13
	(dollars in thousands)	Gross Unrealized Gains			Gross Unrealized Losses			Net Unrealized Gains/ (Losses)				Gross Unrealized Gains			Gross Unrealized Losses			Net Unrealized Gains/ (Losses)
	Total unrealized gains/(losses) on securities available-for-sale	$	11,164		$	(2,302	)	$	8,862			$	6,802		$	(7,776	)	$	(974	)
	Income tax expense/(benefit)	3,907			(806		)	3,101				2,381			(2,722		)	(341		)
	Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss)	$	7,257		$	(1,496	)	$	5,761			$	4,421		$	(5,054	)	$	(633	)
Amortized Cost and Fair Value of Available-for-Sale Securities	'
	The amortized cost and fair value of securities available-for-sale at June 30, 2014, by contractual maturity, are included in the table below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
		30-Jun-14
	(dollars in thousands)	Amortized				Fair Value
		Cost
	Obligations of U.S. government corporations and agencies, and obligations of states and political subdivisions
	Due in one year or less	$	24,049			$	24,289
	Due after one year through five years	182,816				184,074
	Due after five years through ten years	98,068				99,420
	Due after ten years	88,329				90,778
		393,262				398,561
	Collateralized mortgage obligations of U.S. government corporations and agencies	93,787				94,604
	Residential mortgage-backed securities of U.S. government corporations and agencies	44,900				46,389
	Commercial mortgage-backed securities of U.S. government corporations and agencies	40,098				39,920
	Debt Securities	572,047				579,474
	Marketable equity securities	7,579				9,014
	Total	$	579,626			$	588,488

Loans_and_Loans_Held_for_Sale_

Loans and Loans Held for Sale (Tables)	6 Months Ended
	Jun. 30, 2014
Receivables [Abstract]	'
Composition of Loans	'
	The following table indicates the composition of the loans as of the dates presented:
	(dollars in thousands)	June 30, 2014				December 31, 2013
	Commercial
	Commercial real estate	$	1,636,383			$	1,607,756
	Commercial and industrial	922,191				842,449
	Commercial construction	188,311				143,675
	Total Commercial Loans	2,746,885				2,593,880
	Consumer
	Residential mortgage	492,589				487,092
	Home equity	416,226				414,195
	Installment and other consumer	65,838				67,883
	Consumer construction	3,541				3,149
	Total Consumer Loans	978,194				972,319
	Total Portfolio Loans	3,725,079				3,566,199
	Loans held for sale	3,102				2,136
	Total Loans	$	3,728,181			$	3,568,335
Restructured Loans for Periods Presented	'
	The following table summarizes the restructured loans as of the dates presented:
		June 30, 2014										December 31, 2013
	(dollars in thousands)	Accruing			Nonaccruing			Total				Accruing			Nonaccruing			Total
		TDRs			TDRs			TDRs				TDRs			TDRs			TDRs
	Commercial real estate	$	16,934		$	1,431		$	18,365			$	19,711		$	3,898		$	23,609
	Commercial and industrial	7,390			1,170			8,560				7,521			1,884			9,405
	Commercial construction	6,310			1,869			8,179				5,338			2,708			8,046
	Residential mortgage	2,647			645			3,292				2,581			1,356			3,937
	Home equity	3,712			125			3,837				3,924			218			4,142
	Installment and other consumer	127			1			128				154			3			157
	Total	$	37,120		$	5,241		$	42,361			$	39,229		$	10,067		$	49,296
Restructured Loans for Periods Stated	'
	The following tables present the restructured loans for the three and six month periods ended June 30, 2014 and June 30, 2013:
		Three Months Ended June 30, 2014												Three Months Ended June 30, 2013
	(dollars in thousands)	Number of		Pre-Modification			Post-Modification			Total  Difference				Number of		Pre-Modification			Post-Modification		Total  Difference
		Loans		Outstanding			Outstanding			in Recorded				Loans		Outstanding			Outstanding		in Recorded
				Recorded			Recorded			Investment						Recorded			Recorded		Investment
				Investment(1)			Investment(1)									Investment(1)			Investment(1)
	Commercial real estate
	Principal forgiveness (3)	—		$	—		$	—		$	—			1		$	4,339		$	4,339	$	—
	Principal deferral	1		129			127			(2		)		—		—			—		—
	Chapter 7 bankruptcy(2)	—		—			—			—				4		53			51		(2		)
	Commercial and industrial
	Maturity date extension	—		—			—			—				1		751			751		—
	Residential mortgage
	Chapter 7 bankruptcy(2)	1		52			52			—				2		84			75		(9		)
	Home equity
	Chapter 7 bankruptcy(2)	4		43			41			(2		)		17		486			478		(8		)
	Installment and other consumer
	Chapter 7 bankruptcy(2)	1		9			9			—				—		—			—		—
	Total by Concession Type
	Principal forgiveness  (3)	—		—			—			—				1		4,339			4,339		—
	Principal deferral	1		129			127			(2		)		—		—			—		—
	Chapter 7 bankruptcy(2)	6		104			102			(2		)		23		623			604		(19		)
	Maturity date extension	—		—			—			—				1		751			751		—
	Total	7		$	233		$	229		$	4			25		5,713			5,694		(19		)
	(1) Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.
	(2) Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.
	(3) This loan had debt forgiveness of $0.l million to the customer; however, the loan was previously charged off to a balance below the actual contractual balance.
		Six Months Ended June 30, 2014												Six Months Ended June 30, 2013
	(dollars in thousands)	Number of		Pre-Modification			Post-Modification			Total  Difference				Number of		Pre-Modification			Post-Modification		Total  Difference
		Loans		Outstanding			Outstanding			in Recorded				Loans		Outstanding			Outstanding		in Recorded
				Recorded			Recorded			Investment						Recorded			Recorded		Investment
				Investment(1)			Investment(1)									Investment(1)			Investment(1)
	Commercial real estate
	Principal deferral	1		$	129		$	127		$	(2	)		3		$	1,541		$	1,288	$	(253	)
	Principal forgiveness(3)	—		—			—			—				1		4,339			4,339		—
	Chapter 7 bankruptcy(2)	—		—			—			—				7		258			255		(3		)
	Commercial and industrial
	Principal deferral	—		—			—			—				1		392			387		(5		)
	Maturity date extension	—		—			—			—				1		751			751		—
	Chapter 7 bankruptcy(2)	1		287			286			(1		)		1		3			3		—
	Commercial Construction
	Maturity date extension	1		1,019			1,019			—				—		—			—		—
	Residential mortgage
	Principal deferral	—		—			—			—				2		153			153		—
	Chapter 7 bankruptcy(2)	5		329			327			(2		)		8		353			344		(9		)
	Home equity
	Principal deferral	—		—			—			—				1		174			45		(129		)
	Chapter 7 bankruptcy(2)	10		269			251			(18		)		23		648			640		(8		)
	Installment and other consumer
	Chapter 7 bankruptcy(2)	1		9			9			—				6		73			73		—
	Total by Concession Type
	Principal deferral	1		129			127			(2		)		7		2,260			1,873		(387		)
	Principal forgiveness(3)	—		—			—			—				1		4,339			4,339		—
	Maturity date extension	1		1,019			1,019			—				1		751			751		—
	Chapter 7 bankruptcy(2)	17		894			873			(21		)		45		1,335			1,315		(20		)
	Total	19		$	2,042		$	2,019		$	(23	)		54		$	8,685		8,278		(407		)
	(1) Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.
	(2) Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.
	(3) This loan had debt forgiveness of $0.l million to the customer; however, the loan was previously charged off to a balance below the actual contractual balance.
Summary of Nonperforming Assets of Defaulted TDRs	'
	The following tables present a summary of TDRs which defaulted during the periods presented that had been restructured within the last twelve months prior to defaulting:
		Defaulted TDRs
		For the Three Months ended June 30, 2014						For the Three Months ended June 30, 2013
	(dollars in thousands)	Number of		Recorded				Number of			Recorded
		Defaults		Investment				Defaults			Investment
	Commercial real estate	—		$	—			$	—		$	—
	Commercial and Industrial	—		—				—			—
	Commercial construction	—		—				—			—
	Residential real estate	—		—				2			46
	Home equity	—		—				2			33
	Total	—		$	—			$	4		$	79
		Defaulted TDRs
		For the Six Months Ended						For the Six Months Ended
		30-Jun-14						30-Jun-13
	(dollars in thousands)	Number of		Recorded				Number of			Recorded
		Defaults		Investment				Defaults			Investment
	Commercial real estate	—		$	—			$	—		$	—
	Commercial and Industrial	—		—				—			—
	Commercial construction	—		—				—			—
	Residential real estate	1		72				3			64
	Home equity	—		—				4			151
	Total	1		$	72			$	7		$	215
Summary of Nonperforming Assets	'
	The following table is a summary of nonperforming assets as of the dates presented:
		Nonperforming Assets
	(dollars in thousands)	June 30, 2014				December 31, 2013
	Nonperforming Assets
	Nonaccrual loans	$	9,698			$	12,387
	Nonaccrual TDRs	5,241				10,067
	Total nonaccrual loans	14,939				22,454
	OREO	431				410
	Total Nonperforming Assets	$	15,370			$	22,864

Allowance_for_Loan_Losses_Tabl

Allowance for Loan Losses (Tables)	6 Months Ended
	Jun. 30, 2014
Receivables [Abstract]	'
Age Analysis of Past Due Loans Segregated by Class of Loans	'
	The following tables present the age analysis of past due loans segregated by class of loans as of June 30, 2014 and December 31, 2013:
		June 30, 2014
	(dollars in thousands)	Current			30-59 Days			60-89 Days			Nonaccrual			Total Past			Total Loans
					Past Due			Past Due						Due
	Commercial real estate	$	1,629,928		$	753		$	44		$	5,658		$	6,455		$	1,636,383
	Commercial and industrial	918,846			559			249			2,537			3,345			922,191
	Commercial construction	185,428			—			1,014			1,869			2,883			188,311
	Residential mortgage	488,551			1,022			898			2,118			4,038			492,589
	Home equity	412,851			1,466			478			1,431			3,375			416,226
	Installment and other consumer	65,380			364			68			26			458			65,838
	Consumer construction	3,541			—			—			—			—			3,541
	Loans held for sale	1,802			—			—			1,300			1,300			3,102
	Totals	$	3,706,327		$	4,164		$	2,751		$	14,939		$	21,854		$	3,728,181
		December 31, 2013
	(dollars in thousands)	Current			30-59 Days			60-89 Days			Nonaccrual			Total Past			Total Loans
					Past Due			Past Due						Due
	Commercial real estate	$	1,595,590		$	1,209		$	207		$	10,750		$	12,166		$	1,607,756
	Commercial and industrial	836,276			2,599			278			3,296			6,173			842,449
	Commercial construction	139,133			1,049			751			2,742			4,542			143,675
	Residential mortgage	481,260			828			1,666			3,338			5,832			487,092
	Home equity	408,777			2,468			659			2,291			5,418			414,195
	Installment and other consumer	67,420			382			44			37			463			67,883
	Consumer construction	3,149			—			—			—			—			3,149
	Loans held for sale	2,136			—			—			—			—			2,136
	Totals	$	3,533,741		$	8,535		$	3,605		$	22,454		$	34,594		$	3,568,335
Recorded Investment in Commercial Loan Classes by Internally Assigned Risk Ratings	'
	The following tables summarize the recorded investment in commercial loan classes by internally assigned risk ratings as of the dates presented:
		June 30, 2014
	(dollars in thousands)	Commercial			% of			Commercial			% of			Commercial			% of			Total			% of
		Real Estate			Total			and Industrial			Total			Construction			Total						Total
	Pass	$	1,563,882		95.6	%		$	872,686		94.6	%		$	167,267		88.8	%		$	2,603,835		94.8	%
	Special mention	45,275			2.8	%		33,966			3.7	%		12,882			6.8	%		92,123			3.4	%
	Substandard	27,226			1.6	%		15,539			1.7	%		8,162			4.4	%		50,927			1.8	%
	Total	$	1,636,383		100	%		$	922,191		100	%		$	188,311		100	%		$	2,746,885		100	%
		December 31, 2013
	(dollars in thousands)	Commercial			% of			Commercial			% of			Commercial			% of			Total			% of
		Real Estate			Total			and Industrial			Total			Construction			Total						Total
	Pass	$	1,519,720		94.5	%		$	792,029		94	%		$	119,177		82.9	%		$	2,430,926		93.7	%
	Special mention	57,073			3.6	%		34,085			4.1	%		15,621			10.9	%		106,779			4.1	%
	Substandard	30,963			1.9	%		16,335			1.9	%		8,877			6.2	%		56,175			2.2	%
	Total	$	1,607,756		100	%		$	842,449		100	%		$	143,675		100	%		$	2,593,880		100	%
Recorded Investment in Consumer Loan Classes by Performing and Nonperforming Status	'
	The following tables indicate the recorded investment in consumer loan classes by performing and nonperforming status as of the dates presented:
		June 30, 2014
	(dollars in thousands)	Residential			% of		Home			% of		Installment			% of		Consumer			% of		Total			% of
		Mortgage			Total		Equity			Total		and other			Total		Construction			Total					Total
												consumer
	Performing	$	490,471		99.6	%	$	414,795		99.7	%	$	65,812		99.9	%	$	3,541		100	%	$	974,619		99.6	%
	Nonperforming	2,118			0.4	%	1,431			0.3	%	26			0.1	%	—			—	%	3,575			0.4	%
	Total	$	492,589		100	%	$	416,226		100	%	$	65,838		100	%	$	3,541		100	%	$	978,194		100	%
		December 31, 2013
	(dollars in thousands)	Residential			% of		Home			% of		Installment			% of		Consumer			% of		Total			% of
		Mortgage			Total		Equity			Total		and other			Total		Construction			Total					Total
												consumer
	Performing	$	483,754		99.3	%	$	411,904		99.4	%	$	67,846		99.9	%	$	3,149		100	%	$	966,653		99.4	%
	Nonperforming	3,338			0.7	%	2,291			0.6	%	37			0.1	%	—			—	%	5,666			0.6	%
	Total	$	487,092		100	%	$	414,195		100	%	$	67,883		100	%	$	3,149		100	%	$	972,319		100	%
Investments in Loans Considered to be Impaired and Related Information on Impaired Loans	'
	The following tables summarize investments in loans considered to be impaired and related information on those impaired loans for the periods presented:
		For the Three Months Ended
		June 30, 2014						June 30, 2013
	(dollars in thousands)	Average			Interest			Average			Interest
		Recorded			Income			Recorded			Income
		Investment			Recognized			Investment			Recognized
	Without a related allowance recorded:
	Commercial real estate	$	21,382		$	159		$	30,956		$	174
	Commercial and industrial	9,317			57			12,452			66
	Commercial construction	8,279			57			16,376			87
	Consumer real estate	7,166			100			8,708			156
	Other consumer	109			1			114			2
	Total without a Related Allowance Recorded	46,253			374			68,606			485
	With a related allowance recorded:
	Commercial real estate	—			—			2,084			—
	Commercial and industrial	—			—			—			—
	Commercial construction	—			—			—			—
	Consumer real estate	48			1			86			4
	Other consumer	22			—			28			1
	Total with a Related Allowance Recorded	70			1			2,198			5
	Total:
	Commercial real estate	21,382			159			33,040			174
	Commercial and industrial	9,317			57			12,452			66
	Commercial construction	8,279			57			16,376			87
	Consumer real estate	7,214			101			8,794			160
	Other consumer	131			1			142			3
	Total	$	46,323		$	375		$	70,804		$	490
		For the Six Months Ended
		June 30, 2014						June 30, 2013
	(dollars in thousands)	Average			Interest			Average			Interest
		Recorded			Income			Recorded			Income
		Investment			Recognized			Investment			Recognized
	Without a related allowance recorded:
	Commercial real estate	$	21,980		$	329		$	31,181		$	415
	Commercial and industrial	9,066			114			12,449			135
	Commercial construction	8,301			114			16,854			221
	Consumer real estate	7,260			203			9,194			215
	Other consumer	112			2			106			2
	Total without a Related Allowance Recorded	46,719			762			69,784			988
	With a related allowance recorded:
	Commercial real estate	$	—		$	—		3,282			$	—
	Commercial and industrial	—			—			—			—
	Commercial construction	—			—			—			—
	Consumer real estate	50			2			43			4
	Other consumer	23			1			14			1
	Total with a Related Allowance Recorded	73			3			3,339			5
	Total:
	Commercial real estate	21,980			329			34,463			415
	Commercial and industrial	9,066			114			12,449			135
	Commercial construction	8,301			114			16,854			221
	Consumer real estate	7,310			205			9,237			219
	Other consumer	135			3			120			3
	Total	$	46,792		$	765		$	73,123		$	993
	The following table presents investments in loans considered to be impaired and related information on those impaired loans for the periods presented:
		June 30, 2014									December 31, 2013
	(dollars in thousands)	Recorded			Unpaid			Related			Recorded			Unpaid			Related
		Investment			Principal			Allowance			Investment			Principal			Allowance
					Balance									Balance
	Without a related allowance recorded:
	Commercial real estate	$	21,228		$	28,296		$	—		$	26,968		$	35,474		$	—
	Commercial and industrial	9,545			9,660			—			9,580			9,703			—
	Commercial construction	8,179			11,866			—			7,391			12,353			—
	Consumer real estate	7,082			7,629			—			8,026			9,464			—
Other consumer	107			109			—			124			128			—
Total without a Related Allowance Recorded	46,141			57,560			—			52,089			67,122			—
With a related allowance recorded:
Commercial real estate	—			—			—			—			—			—
Commercial and industrial	—			—			—			—			—			—
Commercial construction	—			—			—			681			1,383			25
Consumer real estate	47			47			47			53			53			53
Other consumer	21			21			11			33			33			19
Total with a Related Allowance Recorded	68			68			58			767			1,469			97
Total:
Commercial real estate	21,228			28,296			—			26,968			35,474			—
Commercial and industrial	9,545			9,660			—			9,580			9,703			—
Commercial construction	8,179			11,866			—			8,072			13,736			25
Consumer real estate	7,129			7,676			47			8,079			9,517			53
Other consumer	128			130			11			157			161			19
Total	$	46,209		$	57,628		$	58		$	52,856		$	68,591		$	97
Summary of Allowance for Loan Losses	'
	The following tables detail activity in the ALL for the periods presented:
		Three Months Ended June 30, 2014
	(dollars in thousands)	Commercial				Commercial and				Commercial				Consumer				Other				Total
		Real Estate				Industrial				Construction				Real Estate				Consumer				Loans
	Balance at beginning of period	$	19,880			$	13,979			$	5,183			$	6,408			$	1,166			$	46,616
	Charge-offs	(1,737		)		(743		)		(664		)		(425		)		(177		)		(3,746		)
	Recoveries	1,294				2,936				324				164				126				4,844
	Net Recoveries/ (Charge-offs)	(443		)		2,193				(340		)		(261		)		(51		)		1,098
	Provision for loan losses	1,296				(3,168		)		(84		)		558				264				(1,134		)
	Balance at End of Period	$	20,733			$	13,004			$	4,759			$	6,705			$	1,379			$	46,580
		Three Months Ended June 30, 2013
	(dollars in thousands)	Commercial				Commercial and				Commercial				Consumer				Other				Total
		Real Estate				Industrial				Construction				Real Estate				Consumer				Loans
	Balance at beginning of period	$	24,442			$	8,676			$	6,603			$	5,259			$	956			$	45,936
	Charge-offs	(1,170		)		(563		)		(54		)		(743		)		(399		)		(2,929		)
	Recoveries	1,572				190				2				225				86				2,075
	Net (Charge-offs)/ Recoveries	402				(373		)		(52		)		(518		)		(313		)		(854		)
	Provision for loan losses	(1,360		)		820				(739		)		1,914				388				1,023
	Balance at End of Period	$	23,484			$	9,123			$	5,812			$	6,655			$	1,031			$	46,105
		Six Months Ended June 30, 2014
	(dollars in thousands)	Commercial				Commercial and				Commercial				Consumer				Other				Total
		Real Estate				Industrial				Construction				Real Estate				Consumer				Loans
	Balance at beginning of period	$	18,921			$	14,433			$	5,374			$	6,362			$	1,165			$	46,255
	Charge-offs	(2,004		)		(1,033		)		(692		)		(547		)		(445		)		(4,721		)
	Recoveries	1,834				3,249				375				223				210				5,891
	Net Recoveries/ (Charge-offs)	(170		)		2,216				(317		)		(324		)		(235		)		1,170
	Provision for loan losses	1,982				(3,645		)		(298		)		667				449				(845		)
	Balance at End of Period	$	20,733			$	13,004			$	4,759			$	6,705			$	1,379			$	46,580
		Six Months Ended June 30, 2013
	(dollars in thousands)	Commercial				Commercial and				Commercial				Consumer				Other				Total
		Real Estate				Industrial				Construction				Real Estate				Consumer				Loans
	Balance at beginning of period	$	25,246			$	7,759			$	7,500			$	5,058			$	921			$	46,484
	Charge-offs	(2,809		)		(1,923		)		(443		)		(1,237		)		(651		)		(7,063		)
	Recoveries	2,322				290				55				508				179				3,354
	Net (Charge-offs)/ Recoveries	(487		)		(1,633		)		(388		)		(729		)		(472		)		(3,709		)
	Provision for loan losses	(1,275		)		2,997				(1,300		)		2,326				582				3,330
	Balance at End of Period	$	23,484			$	9,123			$	5,812			$	6,655			$	1,031			$	46,105
Summary of Allowance for Loan Losses and Recorded Investments	'
	The following tables present the ALL and recorded investments in loans by category as of June 30, 2014 and December 31, 2013:
		June 30, 2014
		Allowance for Loan Losses										Portfolio Loans
	(dollars in thousands)	Individually			Collectively			Total				Individually			Collectively			Total
		Evaluated for			Evaluated for							Evaluated for			Evaluated for
		Impairment			Impairment							Impairment			Impairment
	Commercial real estate	$	—		$	20,733		$	20,733			$	21,228		$	1,615,155		$	1,636,383
	Commercial and industrial	—			13,004			13,004				9,545			912,646			922,191
	Commercial construction	—			4,759			4,759				8,179			180,132			188,311
	Consumer real estate	47			6,658			6,705				7,129			905,227			912,356
	Other consumer	11			1,368			1,379				128			65,710			65,838
	Total	$	58		$	46,522		$	46,580			$	46,209		$	3,678,870		$	3,725,079
		December 31, 2013
		Allowance for Loan Losses										Portfolio Loans
	(dollars in thousands)	Individually			Collectively			Total				Individually			Collectively			Total
		Evaluated for			Evaluated for							Evaluated for			Evaluated for
		Impairment			Impairment							Impairment			Impairment
	Commercial real estate	$	—		$	18,921		$	18,921			$	26,968		$	1,580,788		$	1,607,756
	Commercial and industrial	—			14,433			14,433				9,580			832,869			842,449
	Commercial construction	25			5,349			5,374				8,072			135,603			143,675
	Consumer real estate	53			6,309			6,362				8,079			896,357			904,436
	Other consumer	19			1,146			1,165				157			67,726			67,883
	Total	$	97		$	46,158		$	46,255			$	52,856		$	3,513,343		$	3,566,199

Derivative_Instruments_and_Hed1

Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Value of Derivative Assets and Derivative Liabilities	'
	The following table indicates the amounts representing the value of derivative assets and derivative liabilities as of the dates presented:
		Derivatives						Derivatives
		(included in Other Assets)						(included in Other Liabilities)
	(dollars in thousands)	June 30, 2014			December 31, 2013			June 30, 2014			December 31, 2013
	Derivatives not Designated as Hedging Instruments
	Interest Rate Swap Contracts—Commercial Loans
	Fair value	$	14,082		$	13,698		$	14,050		$	13,647
	Notional amount	245,865			261,754			245,865			261,754
	Collateral posted	—			—			11,559			12,611
	Interest Rate Lock Commitments—Mortgage Loans
	Fair value	292			85			—			—
	Notional amount	9,594			3,989			—			—
	Forward Sale Contracts—Mortgage Loans
	Fair value	—			34			59			—
	Notional amount	$	—		$	5,250		$	7,210		$	—
Schedule of Gross Amounts of Derivative Assets and Derivative Liabilities	'
	The following table indicates the gross amounts of commercial loan swap derivative assets and derivative liabilities, the amounts offset and the carrying values in the Consolidated Balance Sheets as of the dates presented:
		Derivatives						Derivatives
		(included in Other Assets)						(included in Other Liabilities)
	(dollars in thousands)	June 30, 2014			December 31, 2013			June 30, 2014			December 31, 2013
	Derivatives not Designated as Hedging Instruments
	Gross amounts recognized	$	14,349		$	14,012		$	14,317		$	13,961
	Gross amounts offset	(267		)	(314		)	(267		)	(314		)
	Net amounts presented in the Consolidated Balance Sheets	14,082			13,698			14,050			13,647
	Gross amounts not offset(1)	—			—			(11,559		)	(12,611		)
	Net Amount	$	14,082		$	13,698		$	2,491		$	1,036
	(1) Amounts represent posted collateral.
Amount of Gain or Loss Recognized in Income on Derivatives	'
	The following table indicates the gain or loss recognized in income on derivatives for the periods presented:
		Three Months Ended June 30,						Six Months Ended June 30,
	(dollars in thousands)	2014			2013			2014			2013
	Derivatives not Designated as Hedging Instruments
	Interest rate swap contracts—commercial loans	$	(11	)	$	(27	)	$	(19	)	$	(156	)
	Interest rate lock commitments—mortgage loans	199			(266		)	207			(492		)
	Forward sale contracts—mortgage loans	(64		)	381			(93		)	405
	Total Derivatives Gain (Loss)	$	124		$	88		$	95		$	(243	)

Borrowings_Tables

Borrowings (Tables)	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Summary of Information Pertaining to Borrowings	'
	Information pertaining to borrowings is summarized in the table below as of the dates presented:
		June 30, 2014				December 31, 2013
	(dollars in thousands)	Balance		Weighted		Balance		Weighted
				Average Rate				Average Rate
	Short-term borrowings
	Securities sold under repurchase agreements	$	25,269	0.01	%	$	33,847	0.01	%
	Short-term borrowings	185,000		0.28	%	140,000		0.3	%
	Total short-term borrowings	210,269		0.25	%	173,847		0.24	%
	Long-term borrowings
	Other long-term borrowings	20,636		2.98	%	21,810		3.01	%
	Junior subordinated debt securities	45,619		2.69	%	45,619		2.7	%
	Total long-term borrowings	66,255		2.78	%	67,429		2.8	%
	Total Borrowings	$	276,524	0.85	%	$	241,276	0.96	%

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Letters of Credit	'
	The following table sets forth the commitments and letters of credit as of the dates presented:
	(dollars in thousands)	June 30, 2014		December 31, 2013
	Commitments to extend credit	$	1,117,511	$	1,038,529
	Standby letters of credit	78,427		78,639
	Total	$	1,195,938	$	1,117,168

Other_Comprehensive_Income_Tab

Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Other Comprehensive Income	'
	The following table presents the tax effects of the components of other comprehensive income (loss) for the periods presented:
		Three Months Ended June 30, 2014									Three Months Ended June 30, 2013
	(dollars in thousands)	Pre-Tax			Tax			Net of Tax			Pre-Tax			Tax			Net of Tax
		Amount			(Expense)			Amount			Amount			(Expense)			Amount
					Benefit									Benefit
	Change in unrealized gains/losses on securities available-for-sale	$	5,401		$	(1,891	)	$	3,510		$	(12,061	)	$	4,221		$	(7,840	)
	Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income (1)	(40		)	15			(25		)	—			—			—
	Adjustment to funded status of employee benefit plans	211			(74		)	137			598			(210		)	388
	Other Comprehensive Income (Loss)	$	5,572		$	(1,950	)	$	3,622		$	(11,463	)	$	4,011		$	(7,452	)
	(1) Reclassification adjustments are comprised of realized security gains. The gains have been reclassified out of accumulated other comprehensive income (loss) and have affected certain lines in the Consolidated Statements of Comprehensive Income as follows; the pre-tax amount is included in securities gains-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.
		Six Months Ended June 30, 2014									Six Months Ended June 30, 2013
	(dollars in thousands)	Pre-Tax			Tax			Net of Tax			Pre-Tax			Tax			Net of Tax
		Amount			(Expense)			Amount			Amount			(Expense)			Amount
					Benefit									Benefit
	Change in unrealized gains/losses on securities available-for-sale	$	9,876		$	(3,457	)	$	6,419		$	(13,829	)	$	4,840		$	(8,989	)
	Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income (1)	(41		)	15			(26		)	(2		)	1			(1		)
	Adjustment to funded status of employee benefit plans	423			(148		)	275			1,196			(419		)	777
	Other Comprehensive Income (Loss)	$	10,258		$	(3,590	)	$	6,668		$	(12,635	)	$	4,422		$	(8,213	)
	(1) Reclassification adjustments are comprised of realized security gains. The gains have been reclassified out of accumulated other comprehensive income and have affected certain lines in the consolidated statement of comprehensive income as follows; the pre-tax amount is included in securities gains-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.

Employee_Benefits_Tables

Employee Benefits (Tables)	6 Months Ended
	Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]	'
Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit	'
	The following table summarizes the components of net periodic pension cost for the periods presented:
		Three Months Ended June 30,						Six Months Ended June 30,
	(dollars in thousands)	2014			2013			2014			2013
	Components of Net Periodic Pension Cost
	Service cost—benefits earned during the period	$	631		$	708		$	1,262		$	1,416
	Interest cost on projected benefit obligation	1,106			996			2,212			1,992
	Expected return on plan assets	(1,735		)	(1,565		)	(3,470		)	(3,130		)
	Amortization of prior service cost (credit)	(35		)	(34		)	(70		)	(68		)
	Recognized net actuarial loss	209			588			418			1,176
	Net Periodic Pension Expense	$	176		$	693		$	352		$	1,386

Segments_Tables

Segments (Tables)	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Total Assets by Reportable Operating Segment	'
	The following table represents total assets by reportable operating segment as of the dates presented:
	(dollars in thousands)	June 30, 2014				December 31, 2013
	Community Banking	$	4,778,233			$	4,524,939
	Insurance	7,715				6,926
	Wealth Management	2,082				1,325
	Total Assets	$	4,788,030			$	4,533,190
Financial Information of Segments	'
	The information provided under the caption “Eliminations” represents operations not considered to be reportable segments and/or general operating expenses and eliminations and adjustments, which are necessary for purposes of reconciling to the Consolidated Financial Statements.
		Three Months Ended June 30, 2014
	(dollars in thousands)	Community			Insurance			Wealth Management		Eliminations			Consolidated
		Banking
	Interest income	$	39,845		$	—		$	136	$	(109	)	$	39,872
	Interest expense	3,415			—			—		(398		)	3,017
	Net interest income	36,430			—			136		289			36,855
	Provision for loan losses	(1,134		)	—			—		—			(1,134		)
	Noninterest income	7,522			1,245			2,828		176			11,771
	Noninterest expense	25,092			1,044			2,442		465			29,043
	Depreciation expense	805			13			7		—			825
	Amortization of intangible assets	274			13			10		—			297
	Provision for income taxes	4,637			61			177		—			4,875
	Net Income	$	14,278		$	114		$	328	$	—		$	14,720
		Three Months Ended June 30, 2013
	(dollars in thousands)	Community			Insurance			Wealth Management		Eliminations			Consolidated
		Banking
	Interest income	$	38,505		$	—		$	135	$	(87	)	$	38,553
	Interest expense	4,663			—			—		(706		)	3,957
	Net interest income	33,842			—			135		619			34,596
	Provision for loan losses	1,023			—			—		—			1,023
	Noninterest income	8,467			1,349			2,812		239			12,867
	Noninterest expense	21,786			1,105			2,389		1,797			27,077
	Depreciation expense	876			12			8		—			896
	Amortization of intangible assets	387			13			13		—			413
	Provision (benefit) for income taxes	4,592			77			221		(939		)	3,951
	Net Income	$	13,645		$	142		$	316	$	—		$	14,103
		Six Months Ended June 30, 2014
	(dollars in thousands)	Community			Insurance			Wealth		Eliminations			Consolidated
		Banking						Management
	Interest income	$	78,475		$	—		$	310	$	(248	)	$	78,537
	Interest expense	6,897			—			—		(806		)	6,091
	Net interest income	71,578			—			310		558			72,446
	Provision for loan losses	(845		)	—			—		—			(845		)
	Noninterest income	14,375			2,766			5,764		282			23,187
	Noninterest expense	49,066			2,199			4,716		840			56,821
	Depreciation expense	1,607			25			13		—			1,645
	Amortization of intangible assets	566			25			22		—			613
	Provision for income taxes	8,002			181			463		—			8,646
	Net Income	$	27,557		$	336		$	860	$	—		$	28,753
		Six Months Ended June 30, 2013
	(dollars in thousands)	Community			Insurance			Wealth		Eliminations			Consolidated
		Banking						Management
	Interest income	$	76,194		$	1		$	273	$	(72	)	$	76,396
	Interest expense	9,454			—			—		(1,323		)	8,131
	Net interest income	66,740			1			273		1,251			68,265
	Provision for loan losses	3,330			—			—		—			3,330
	Noninterest income	18,823			2,947			5,386		517			27,673
	Noninterest expense	46,427			2,552			4,878		3,468			57,325
	Depreciation expense	1,795			22			16		—			1,833
	Amortization of intangible assets	792			26			26		—			844
	Provision (benefit) for income taxes	7,438			122			313		(1,700		)	6,173
	Net Income	$	25,781		$	226		$	426	$	—		$	26,433

Basis_of_Presentation_Addition

Basis of Presentation - Additional Information (Detail)	Jun. 30, 2014
Minimum [Member]	'
Summary Of Significant Accounting Policies [Line Items]	'
Percentage of outstanding common stock of investees accounted for using equity method of accounting	20.00%
Maximum [Member]	'
Summary Of Significant Accounting Policies [Line Items]	'
Percentage of outstanding common stock of investees accounted for using equity method of accounting	50.00%

Earnings_Per_Share_Reconciles_

Earnings Per Share - Reconciles Numerators and Denominators of Basic Earnings Per Share with Diluted Earnings Per Share (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Numerator for Earnings per Share-Basic:	'	'	'	'
Net income	$14,720	$14,103	$28,753	$26,433
Less: Income allocated to participating shares	29	36	64	81
Net Income Allocated to Shareholders	14,691	14,067	28,689	26,352
Numerator for Earnings per Share-Diluted:	'	'	'	'
Net income	14,720	14,103	28,753	26,433
Net Income Available to Shareholders	$14,720	$14,103	$28,753	$26,433
Denominators:	'	'	'	'
Weighted Average Shares Outstanding-Basic	29,684,300	29,654,018	29,672,611	29,637,825
Add: Dilutive potential shares	16,894	23,858	27,559	41,319
Denominator for Treasury Stock Method-Diluted	29,701,194	29,677,876	29,700,170	29,679,144
Weighted Average Shares Outstanding-Basic	29,684,300	29,654,018	29,672,611	29,637,825
Add: Average participating shares outstanding	58,973	74,994	66,563	91,530
Denominator for Two-Class Method-Diluted	29,743,273	29,729,012	29,739,174	29,729,355
Earnings per share—basic (in dollars per share)	$0.49	$0.47	$0.97	$0.89
Earnings per share—diluted (in dollars per share)	$0.49	$0.47	$0.97	$0.89
Warrants [Member]	'	'	'	'
Denominators:	'	'	'	'
Anti-dilutive excluded from dilutive potential shares	517,012	517,012	517,012	517,012
Stock Options [Member]	'	'	'	'
Denominators:	'	'	'	'
Anti-dilutive excluded from dilutive potential shares	428,493	629,570	428,676	642,499
Restricted Stock [Member]	'	'	'	'
Denominators:	'	'	'	'
Anti-dilutive excluded from dilutive potential shares	42,079	51,136	39,005	50,211

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'	'
Fair value of asset transfer from Level 1 to Level 2 on recurring basis	$0	$0
Fair value of asset transfer from Level 2 to Level 1 on recurring basis	0	0
Fair value of liabilities transfer from Level 1 to Level 2 on recurring basis	0	0
Fair value of liabilities transfer from Level 2 to Level 1 recurring basis	0	0
Liabilities measured at estimated fair value on nonrecurring basis	$0	$0

Fair_Value_Measurements_Assets

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS	'	'
Total securities available-for-sale	$588,488	$509,425
Obligations of U.S. Government Corporations and Agencies [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	270,248	234,751
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	94,604	63,774
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	46,389	48,669
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	39,920	39,052
Obligations of States and Political Subdivisions [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	128,313	114,264
Marketable Equity Securities [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	9,014	8,915
Fair Value Measurements, Recurring [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	588,488	509,425
Trading securities held in a Rabbi Trust	3,117	2,864
Total securities	591,605	512,289
Total Assets	605,979	526,106
LIABILITIES	'	'
Total Liabilities	14,109	13,647
Fair Value Measurements, Recurring [Member] | Obligations of U.S. Government Corporations and Agencies [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	270,248	234,751
Fair Value Measurements, Recurring [Member] | Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	94,604	63,774
Fair Value Measurements, Recurring [Member] | Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	46,389	48,669
Fair Value Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	39,920	39,052
Fair Value Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	128,313	114,264
Fair Value Measurements, Recurring [Member] | Marketable Equity Securities [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	9,014	8,915
Fair Value Measurements, Recurring [Member] | Interest Rate Swaps [Member]	'	'
ASSETS	'	'
Derivative financial assets	14,082	13,698
LIABILITIES	'	'
Derivative financial liabilities	14,050	13,647
Fair Value Measurements, Recurring [Member] | Interest Rate Lock Commitments [Member]	'	'
ASSETS	'	'
Derivative financial assets	292	85
Fair Value Measurements, Recurring [Member] | Forward Sale Contracts [Member]	'	'
ASSETS	'	'
Derivative financial assets	0	34
LIABILITIES	'	'
Derivative financial liabilities	59	'
Level 1 [Member] | Fair Value Measurements, Recurring [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	179	202
Trading securities held in a Rabbi Trust	3,117	2,864
Total securities	3,296	3,066
Total Assets	3,296	3,066
LIABILITIES	'	'
Total Liabilities	0	'
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Obligations of U.S. Government Corporations and Agencies [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	'	'
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	'	'
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	'	'
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	'	'
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	'	'
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Marketable Equity Securities [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	179	202
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Interest Rate Swaps [Member]	'	'
ASSETS	'	'
Derivative financial assets	'	'
LIABILITIES	'	'
Derivative financial liabilities	'	'
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Interest Rate Lock Commitments [Member]	'	'
ASSETS	'	'
Derivative financial assets	'	'
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Forward Sale Contracts [Member]	'	'
ASSETS	'	'
Derivative financial assets	0	'
LIABILITIES	'	'
Derivative financial liabilities	'	'
Level 2 [Member] | Fair Value Measurements, Recurring [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	588,309	509,223
Trading securities held in a Rabbi Trust	'	'
Total securities	588,309	509,223
Total Assets	602,683	523,040
LIABILITIES	'	'
Total Liabilities	14,109	13,647
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Obligations of U.S. Government Corporations and Agencies [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	270,248	234,751
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	94,604	63,774
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	46,389	48,669
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	39,920	39,052
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	128,313	114,264
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Marketable Equity Securities [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	8,835	8,713
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Interest Rate Swaps [Member]	'	'
ASSETS	'	'
Derivative financial assets	14,082	13,698
LIABILITIES	'	'
Derivative financial liabilities	14,050	13,647
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Interest Rate Lock Commitments [Member]	'	'
ASSETS	'	'
Derivative financial assets	292	85
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Forward Sale Contracts [Member]	'	'
ASSETS	'	'
Derivative financial assets	0	34
LIABILITIES	'	'
Derivative financial liabilities	59	'
Level 3 [Member] | Fair Value Measurements, Recurring [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	'	'
Trading securities held in a Rabbi Trust	'	'
Total securities	'	'
Total Assets	'	'
LIABILITIES	'	'
Total Liabilities	0	'
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Obligations of U.S. Government Corporations and Agencies [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	'	'
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	'	'
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	'	'
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	'	'
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	'	'
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Marketable Equity Securities [Member]	'	'
ASSETS	'	'
Total securities available-for-sale	'	'
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Interest Rate Swaps [Member]	'	'
ASSETS	'	'
Derivative financial assets	'	'
LIABILITIES	'	'
Derivative financial liabilities	'	'
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Interest Rate Lock Commitments [Member]	'	'
ASSETS	'	'
Derivative financial assets	'	'
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Forward Sale Contracts [Member]	'	'
ASSETS	'	'
Derivative financial assets	0	'
LIABILITIES	'	'
Derivative financial liabilities	'	'

Fair_Value_Measurements_Change

Fair Value Measurements - Changes in Assets Classified as Level 3 in Fair Value Hierarchy (Detail) (USD $)	3 Months Ended				6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Balance at beginning of period	'		$312		'		$300
Total gains included in other comprehensive income	'	[1]	32	[1]	'	[1]	44	[1]
Net purchases, sales, issuances and settlements	'		0		'		'
Transfers out of Level 3	'		-344		'		-344
Balance at end of period	'		$0		'		$0
[1]	Changes in estimated fair value of available-for-sale investments are recorded in accumulated other comprehensive income (loss), while realized gains and losses from sales are recorded in security gains (losses), net in the Consolidated Statements of Comprehensive Income.

Fair_Value_Measurements_Assets1

Fair Value Measurements - Assets Measured at Estimated Fair Value on Nonrecurring Basis by Fair Value Hierarchy (Detail) (Fair Value, Measurements, Nonrecurring [Member], USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS	'	'
Loans held for sale	$1,300	$1,516
Impaired loans	14,483	19,197
Other real estate owned	317	317
Mortgage servicing rights	1,211	1,025
Total Assets	17,311	22,055
Level 1 [Member]	'	'
ASSETS	'	'
Loans held for sale	'	'
Impaired loans	'	'
Other real estate owned	'	'
Mortgage servicing rights	'	'
Total Assets	'	'
Level 2 [Member]	'	'
ASSETS	'	'
Loans held for sale	'	'
Impaired loans	'	'
Other real estate owned	'	'
Mortgage servicing rights	'	'
Total Assets	'	'
Level 3 [Member]	'	'
ASSETS	'	'
Loans held for sale	1,300	1,516
Impaired loans	14,483	19,197
Other real estate owned	317	317
Mortgage servicing rights	1,211	1,025
Total Assets	$17,311	$22,055

Fair_Value_Measurements_Carryi

Fair Value Measurements - Carrying Values and Fair Values of Financial Instruments (Detail) (USD $)	Jun. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS	'		'
Securities available-for-sale	$588,488		$509,425
FHLB and other restricted stock	15,818		13,629
LIABILITIES	'		'
Junior subordinated debt securities	45,619		45,619
Carrying Value [Member]	'		'
ASSETS	'		'
Cash and due from banks, including interest-bearing deposits	130,235	[1]	108,356	[1]
Securities available-for-sale	588,488	[1]	509,425	[1]
Loans held for sale	3,102	[1]	2,136	[1]
Portfolio loans, net of unearned income	3,725,079	[1]	3,566,199	[1]
Bank owned life insurance	61,348	[1]	60,480	[1]
FHLB and other restricted stock	15,818	[1]	13,629	[1]
Trading securities held in a Rabbi Trust	3,117	[1]	2,864	[1]
Mortgage servicing rights	2,743	[1]	2,919	[1]
LIABILITIES	'		'
Deposits	3,865,246	[1]	3,672,308	[1]
Securities sold under repurchase agreements	25,269	[1]	33,847	[1]
Short-term borrowings	185,000	[1]	140,000	[1]
Long-term borrowings	20,636	[1]	21,810	[1]
Junior subordinated debt securities	45,619	[1]	45,619	[1]
Carrying Value [Member] | Interest Rate Swaps [Member]	'		'
ASSETS	'		'
Derivative financial assets	14,082	[1]	13,698	[1]
LIABILITIES	'		'
Derivative financial liabilities	14,050	[1]	13,647	[1]
Carrying Value [Member] | Interest Rate Lock Commitments [Member]	'		'
ASSETS	'		'
Derivative financial assets	292	[1]	85	[1]
Carrying Value [Member] | Forward Sale Contracts [Member]	'		'
ASSETS	'		'
Derivative financial assets	'		34	[1]
LIABILITIES	'		'
Derivative financial liabilities	59	[1]	'
Fair Value Measurements [Member]	'		'
ASSETS	'		'
Cash and due from banks, including interest-bearing deposits	130,235		108,356
Securities available-for-sale	588,488		509,425
Loans held for sale	3,121		2,139
Portfolio loans, net of unearned income	3,691,807		3,538,072
Bank owned life insurance	61,348		60,480
FHLB and other restricted stock	15,818		13,629
Trading securities held in a Rabbi Trust	3,117		2,864
Mortgage servicing rights	2,890		3,143
LIABILITIES	'		'
Deposits	3,867,540		3,673,624
Securities sold under repurchase agreements	25,269		33,847
Short-term borrowings	185,000		140,000
Long-term borrowings	21,779		22,924
Junior subordinated debt securities	45,619		45,619
Fair Value Measurements [Member] | Level 1 [Member]	'		'
ASSETS	'		'
Cash and due from banks, including interest-bearing deposits	130,235		108,356
Securities available-for-sale	179		202
Trading securities held in a Rabbi Trust	3,117		2,864
Fair Value Measurements [Member] | Level 2 [Member]	'		'
ASSETS	'		'
Securities available-for-sale	588,309		509,223
Bank owned life insurance	61,348		60,480
Fair Value Measurements [Member] | Level 3 [Member]	'		'
ASSETS	'		'
Loans held for sale	3,121		2,139
Portfolio loans, net of unearned income	3,691,807		3,538,072
FHLB and other restricted stock	15,818		13,629
Mortgage servicing rights	2,890		3,143
LIABILITIES	'		'
Deposits	3,867,540		3,673,624
Securities sold under repurchase agreements	25,269		33,847
Short-term borrowings	185,000		140,000
Long-term borrowings	21,779		22,924
Junior subordinated debt securities	45,619		45,619
Fair Value Measurements [Member] | Interest Rate Swaps [Member]	'		'
ASSETS	'		'
Derivative financial assets	14,082		13,698
LIABILITIES	'		'
Derivative financial liabilities	14,050		13,647
Fair Value Measurements [Member] | Interest Rate Swaps [Member] | Level 2 [Member]	'		'
ASSETS	'		'
Derivative financial assets	14,082		13,698
LIABILITIES	'		'
Derivative financial liabilities	14,050		13,647
Fair Value Measurements [Member] | Interest Rate Lock Commitments [Member]	'		'
ASSETS	'		'
Derivative financial assets	292		85
Fair Value Measurements [Member] | Interest Rate Lock Commitments [Member] | Level 2 [Member]	'		'
ASSETS	'		'
Derivative financial assets	292		85
Fair Value Measurements [Member] | Forward Sale Contracts [Member]	'		'
ASSETS	'		'
Derivative financial assets	'		34
LIABILITIES	'		'
Derivative financial liabilities	59		'
Fair Value Measurements [Member] | Forward Sale Contracts [Member] | Level 2 [Member]	'		'
ASSETS	'		'
Derivative financial assets	'		34
LIABILITIES	'		'
Derivative financial liabilities	$59		'
[1]	As reported in the Consolidated Balance Sheets

Securities_AvailableforSale_Co

Securities Available-for-Sale - Composition of Securities Available-for-Sale (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$579,626	$510,399
Gross Unrealized Gains	11,164	6,802
Gross Unrealized Losses	-2,302	-7,776
Fair Value	588,488	509,425
Obligations of U.S. Government Corporations and Agencies [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	268,614	235,181
Gross Unrealized Gains	2,733	2,151
Gross Unrealized Losses	-1,099	-2,581
Fair Value	270,248	234,751
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	93,787	63,776
Gross Unrealized Gains	1,035	601
Gross Unrealized Losses	-218	-603
Fair Value	94,604	63,774
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	44,900	47,934
Gross Unrealized Gains	1,720	1,420
Gross Unrealized Losses	-231	-685
Fair Value	46,389	48,669
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	40,098	40,357
Gross Unrealized Gains	224	0
Gross Unrealized Losses	-402	-1,305
Fair Value	39,920	39,052
Obligations of States and Political Subdivisions [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	124,648	115,572
Gross Unrealized Gains	4,017	1,294
Gross Unrealized Losses	-352	-2,602
Fair Value	128,313	114,264
Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	572,047	502,820
Gross Unrealized Gains	9,729	5,466
Gross Unrealized Losses	-2,302	-7,776
Fair Value	579,474	500,510
Marketable Equity Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	7,579	7,579
Gross Unrealized Gains	1,435	1,336
Gross Unrealized Losses	0	0
Fair Value	$9,014	$8,915

Securities_AvailableforSale_Sc

Securities Available-for-Sale - Schedule of Gross and Net Realized Gains and Losses on Sale of Securities (Details) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Investments, Debt and Equity Securities [Abstract]	'	'	'	'
Gross realized gains	$40	$0	$41	$2
Gross realized losses	0	0	0	0
Net Realized Gains	$40	$0	$41	$2

Securities_AvailableforSale_Fa

Securities Available-for-Sale - Fair Value and Age of Gross Unrealized Losses by Investment Category (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	security	security
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale, Securities, Less Than 12 Months, Number of Positions	5	41
Available-for-sale Securities, Less Than 12 Months, Fair Value	$41,434	$274,942
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	-313	-6,913
Available-for-sale, Securities, 12 Months or More, Number of Positions	14	2
Available-for-sale Securities, 12 Months or More, Fair Value	109,491	10,088
Available-for-sale Securities, 12 Months or More, Unrealized Losses	-1,989	-863
Available-for-sale Securities, Fair Value, Total	150,925	285,030
Number of debt securities on which unrealized losses were primarily attributable to changes in interest	19	'
Available-for-sale, Securities, Number of Positions	'	43
Available-for-sale Securities, Unrealized Losses, Total	-2,302	-7,776
Obligations of U.S. Government Corporations and Agencies [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale, Securities, Less Than 12 Months, Number of Positions	2	16
Available-for-sale Securities, Less Than 12 Months, Fair Value	19,741	126,017
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	-78	-2,581
Available-for-sale, Securities, 12 Months or More, Number of Positions	8	0
Available-for-sale Securities, 12 Months or More, Fair Value	63,265	0
Available-for-sale Securities, 12 Months or More, Unrealized Losses	-1,021	0
Available-for-sale Securities, Fair Value, Total	83,006	126,017
Available-for-sale, Securities, Number of Positions	10	16
Available-for-sale Securities, Unrealized Losses, Total	-1,099	-2,581
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale, Securities, Less Than 12 Months, Number of Positions	1	3
Available-for-sale Securities, Less Than 12 Months, Fair Value	11,420	39,522
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	-218	-603
Available-for-sale, Securities, 12 Months or More, Number of Positions	0	0
Available-for-sale Securities, 12 Months or More, Fair Value	0	0
Available-for-sale Securities, 12 Months or More, Unrealized Losses	0	0
Available-for-sale Securities, Fair Value, Total	11,420	39,522
Available-for-sale, Securities, Number of Positions	1	3
Available-for-sale Securities, Unrealized Losses, Total	-218	-603
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale, Securities, Less Than 12 Months, Number of Positions	0	2
Available-for-sale Securities, Less Than 12 Months, Fair Value	0	22,822
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	0	-685
Available-for-sale, Securities, 12 Months or More, Number of Positions	1	0
Available-for-sale Securities, 12 Months or More, Fair Value	9,414	0
Available-for-sale Securities, 12 Months or More, Unrealized Losses	-231	0
Available-for-sale Securities, Fair Value, Total	9,414	22,822
Available-for-sale, Securities, Number of Positions	1	2
Available-for-sale Securities, Unrealized Losses, Total	-231	-685
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale, Securities, Less Than 12 Months, Number of Positions	1	4
Available-for-sale Securities, Less Than 12 Months, Fair Value	10,009	39,052
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	-16	-1,305
Available-for-sale, Securities, 12 Months or More, Number of Positions	2	0
Available-for-sale Securities, 12 Months or More, Fair Value	20,837	0
Available-for-sale Securities, 12 Months or More, Unrealized Losses	-386	0
Available-for-sale Securities, Fair Value, Total	30,846	39,052
Available-for-sale, Securities, Number of Positions	3	4
Available-for-sale Securities, Unrealized Losses, Total	-402	-1,305
Obligations of States and Political Subdivisions [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale, Securities, Less Than 12 Months, Number of Positions	1	16
Available-for-sale Securities, Less Than 12 Months, Fair Value	264	47,529
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	-1	-1,739
Available-for-sale, Securities, 12 Months or More, Number of Positions	3	2
Available-for-sale Securities, 12 Months or More, Fair Value	15,975	10,088
Available-for-sale Securities, 12 Months or More, Unrealized Losses	-351	-863
Available-for-sale Securities, Fair Value, Total	16,239	57,617
Available-for-sale, Securities, Number of Positions	4	18
Available-for-sale Securities, Unrealized Losses, Total	-352	-2,602
Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale, Securities, Less Than 12 Months, Number of Positions	5	41
Available-for-sale Securities, Less Than 12 Months, Fair Value	41,434	274,942
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	-313	-6,913
Available-for-sale, Securities, 12 Months or More, Number of Positions	14	2
Available-for-sale Securities, 12 Months or More, Fair Value	109,491	10,088
Available-for-sale Securities, 12 Months or More, Unrealized Losses	-1,989	-863
Available-for-sale Securities, Fair Value, Total	150,925	285,030
Available-for-sale, Securities, Number of Positions	19	43
Available-for-sale Securities, Unrealized Losses, Total	-2,302	-7,776
Marketable Equity Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Available-for-sale, Securities, Less Than 12 Months, Number of Positions	0	0
Available-for-sale Securities, Less Than 12 Months, Fair Value	0	0
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	0	0
Available-for-sale, Securities, 12 Months or More, Number of Positions	0	0
Available-for-sale Securities, 12 Months or More, Fair Value	0	0
Available-for-sale Securities, 12 Months or More, Unrealized Losses	0	0
Available-for-sale Securities, Fair Value, Total	0	0
Available-for-sale, Securities, Number of Positions	0	0
Available-for-sale Securities, Unrealized Losses, Total	$0	$0

Securities_AvailableforSale_Ad

Securities Available-for-Sale - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
	security
Investments, Debt and Equity Securities [Abstract]	'	'
Number of debt securities on which unrealized losses were primarily attributable to changes in interest	19	'
Unrealized losses reclassified out of accumulated other comprehensive income into earnings	$0	'
Carrying values of securities	$273,500,000	$243,200,000

Securities_Availableforsale_Un

Securities Available-for-sale - Unrealized Gains (Losses) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Investments, Debt and Equity Securities [Abstract]	'	'
Total unrealized gains/(losses) on securities available for sale, Gross Unrealized Gains	$11,164	$6,802
Total unrealized gains/(losses) on securities available for sale, Gross Unrealized Losses	-2,302	-7,776
Total unrealized gains/(losses) on securities available for sale, Net Unrealized Gains/(Losses)	8,862	-974
Income Tax expense/(benefit), Gross Unrealized Gains	3,907	2,381
Income Tax expense/(benefit), Gross Unrealized Losses	-806	-2,722
Income Tax expense/(benefit), Net Unrealized Gains/ (Losses)	3,101	-341
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Gross Unrealized Gains	7,257	4,421
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Gross Unrealized Losses	-1,496	-5,054
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Net Unrealized Gains/ (Losses)	$5,761	($633)

Securities_AvailableforSale_Am

Securities Available-for-Sale - Amortized Cost and Fair Value of Available-for-Sale Securities (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$579,626	$510,399
Fair Value	588,488	509,425
Obligations of U.S. Government Corporations and Agencies, and Obligations of States and Political Subdivisions [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Due in one year or less, Amortized Cost	24,049	'
Due after one year through five years, Amortized Cost	182,816	'
Due after five years through ten years, Amortized Cost	98,068	'
Due after ten years, Amortized Cost	88,329	'
Available-for-sale Securities, Debt Maturities, Amortized Cost	393,262	'
Due in one year or less, Fair Value	24,289	'
Due after one year through five years, Fair Value	184,074	'
Due after five years through ten years, Fair Value	99,420	'
Due after ten years, Fair Value	90,778	'
Fair Value, Debt securities	398,561	'
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	93,787	63,776
Fair Value	94,604	63,774
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	44,900	47,934
Fair Value	46,389	48,669
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	40,098	40,357
Fair Value	39,920	39,052
Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	572,047	502,820
Fair Value	579,474	500,510
Marketable Equity Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	7,579	7,579
Fair Value	$9,014	$8,915

Loans_and_Loans_Held_for_Sale_1

Loans and Loans Held for Sale - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
	TDRs	TDRs	TDRs	TDRs
			Property
			SecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Unearned income on loans	$1,800,000	'	$1,800,000	'	$1,300,000
Percentage of commercial loans in total portfolio loans	74.00%	'	74.00%	'	73.00%
Maximum concentration of commercial real estate and commercial construction portfolio in loans (in excess of)	9.00%	'	9.00%	'	9.00%
Number of TDRs returned back to accruing status	4	0	5	1	'
Financial receivable trouble debt restructuring reclassified to accruing trouble debt restructuring status	1,400,000	'	1,500,000	200,000	'
Number of loans modified not considered to be troubled debt restructuring	'	'	3	'	'
Commitment to lend additional funds on TDRs	0	'	0	'	'
Minimum period of loan payment defaults following restructure for TDRs to be in default	'	'	'90 days	'	'
Other real estate owned properties	'	'	8	'	'
Commercial Real Estate and Commercial Construction [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Combined percentage of commercial real estate and commercial construction in total commercial loans	66.00%	'	66.00%	'	68.00%
Combined percentage of commercial real estate and commercial construction in total portfolio loans	49.00%	'	49.00%	'	49.00%
Out-of-state exposure of combined portfolio	26.00%	'	26.00%	'	23.00%
Percentage of total loans out-of-state	13.00%	'	13.00%	'	11.00%
Out-of-state exposure of combined portfolio excluding contiguous states	7.20%	'	7.20%	'	7.90%
Percentage of total loans out-of-state excluding contiguous states	3.60%	'	3.60%	'	3.90%
Commercial and Industrial [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Loans modified not considered to be troubled debt restructuring	'	'	400,000	'	'
Commercial Real Estate [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Number of loans modified not considered to be troubled debt restructuring	2	'	2	'	'
Loans modified not considered to be troubled debt restructuring	$1,200,000	'	$1,200,000	'	'

Loans_and_Loans_Held_for_Sale_2

Loans and Loans Held for Sale - Composition of Loans (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Composition of the loans	'	'
Commercial Loans	$2,746,885	$2,593,880
Consumer Loans	978,194	972,319
Total Portfolio Loans	3,725,079	3,566,199
Loans held for sale	3,102	2,136
Total Loans	3,728,181	3,568,335
Commercial Real Estate [Member]	'	'
Composition of the loans	'	'
Commercial Loans	1,636,383	1,607,756
Total Portfolio Loans	1,636,383	1,607,756
Total Loans	1,636,383	1,607,756
Commercial and Industrial [Member]	'	'
Composition of the loans	'	'
Commercial Loans	922,191	842,449
Total Portfolio Loans	922,191	842,449
Total Loans	922,191	842,449
Commercial Construction [Member]	'	'
Composition of the loans	'	'
Commercial Loans	188,311	143,675
Total Portfolio Loans	188,311	143,675
Total Loans	188,311	143,675
Residential Mortgage [Member]	'	'
Composition of the loans	'	'
Consumer Loans	492,589	487,092
Total Loans	492,589	487,092
Home Equity [Member]	'	'
Composition of the loans	'	'
Consumer Loans	416,226	414,195
Total Loans	416,226	414,195
Installment and Other Consumer [Member]	'	'
Composition of the loans	'	'
Consumer Loans	65,838	67,883
Total Loans	65,838	67,883
Consumer Construction [Member]	'	'
Composition of the loans	'	'
Consumer Loans	3,541	3,149
Total Loans	$3,541	$3,149

Loans_and_Loans_Held_for_Sale_3

Loans and Loans Held for Sale - Restructured Loans for Periods Presented (Detail) (USD $)

3 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

6 Months Ended

12 Months Ended

In Thousands, unless otherwise specified

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Accruing TDRs [Member]

Accruing TDRs [Member]

Accruing TDRs [Member]

Accruing TDRs [Member]

Accruing TDRs [Member]

Accruing TDRs [Member]

Accruing TDRs [Member]

Accruing TDRs [Member]

Accruing TDRs [Member]

Accruing TDRs [Member]

Accruing TDRs [Member]

Accruing TDRs [Member]

Accruing TDRs [Member]

Accruing TDRs [Member]

Nonaccruing TDRs [Member]

Nonaccruing TDRs [Member]

Nonaccruing TDRs [Member]

Nonaccruing TDRs [Member]

Nonaccruing TDRs [Member]

Nonaccruing TDRs [Member]

Nonaccruing TDRs [Member]

Nonaccruing TDRs [Member]

Nonaccruing TDRs [Member]

Nonaccruing TDRs [Member]

Nonaccruing TDRs [Member]

Nonaccruing TDRs [Member]

Nonaccruing TDRs [Member]

Nonaccruing TDRs [Member]

Total TDRs [Member]

Total TDRs [Member]

Total TDRs [Member]

Total TDRs [Member]

Total TDRs [Member]

Total TDRs [Member]

Total TDRs [Member]

Total TDRs [Member]

Total TDRs [Member]

Total TDRs [Member]

Total TDRs [Member]

Total TDRs [Member]

Total TDRs [Member]

Total TDRs [Member]

Commercial Real Estate [Member]

Commercial Real Estate [Member]

Commercial and Industrial [Member]

Commercial and Industrial [Member]

Commercial Construction [Member]

Commercial Construction [Member]

Residential Mortgage [Member]

Residential Mortgage [Member]

Home Equity [Member]

Home Equity [Member]

Installment and Other Consumer [Member]

Installment and Other Consumer [Member]

Commercial Real Estate [Member]

Commercial Real Estate [Member]

Commercial and Industrial [Member]

Commercial and Industrial [Member]

Commercial Construction [Member]

Commercial Construction [Member]

Residential Mortgage [Member]

Residential Mortgage [Member]

Home Equity [Member]

Home Equity [Member]

Installment and Other Consumer [Member]

Installment and Other Consumer [Member]

Commercial Real Estate [Member]

Commercial Real Estate [Member]

Commercial and Industrial [Member]

Commercial and Industrial [Member]

Commercial Construction [Member]

Commercial Construction [Member]

Residential Mortgage [Member]

Residential Mortgage [Member]

Home Equity [Member]

Home Equity [Member]

Installment and Other Consumer [Member]

Installment and Other Consumer [Member]

Financing Receivable, Modifications [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restructured loans

$229

[1]

$5,694

[1]

$2,019

[1]

$8,278

[1]

$37,120

$39,229

$16,934

$19,711

$7,390

$7,521

$6,310

$5,338

$2,647

$2,581

$3,712

$3,924

$127

$154

$5,241

$10,067

$1,431

$3,898

$1,170

$1,884

$1,869

$2,708

$645

$1,356

$125

$218

$1

$3

$42,361

$49,296

$18,365

$23,609

$8,560

$9,405

$8,179

$8,046

$3,292

$3,937

$3,837

$4,142

$128

$157

[1]

Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.

Loans_and_Loans_Held_for_Sale_4

Loans and Loans Held for Sale - Restructured Loans for Periods Stated (Detail) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
	SecurityLoan		SecurityLoan		SecurityLoan		SecurityLoan
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Loans	7		25		19		54
Pre-Modification Outstanding Recorded Investment	$233,000	[1]	$5,713,000	[1]	$2,042,000	[1]	$8,685,000	[1]
Post-Modification Outstanding Recorded Investment	229,000	[1]	5,694,000	[1]	2,019,000	[1]	8,278,000	[1]
Total Difference in Recorded Investment	4,000		-19,000		-23,000		-407,000
Debt forgiveness to customers	'		100,000		'		'
Principal Deferral [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Loans	1		0		1		7
Pre-Modification Outstanding Recorded Investment	129,000	[1]	0	[1]	129,000	[1]	2,260,000	[1]
Post-Modification Outstanding Recorded Investment	127,000	[1]	0	[1]	127,000	[1]	1,873,000	[1]
Total Difference in Recorded Investment	-2,000		0		-2,000		-387,000
Chapter 7 Bankruptcy [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Loans	6	[2]	23	[2]	17	[2]	45	[2]
Pre-Modification Outstanding Recorded Investment	104,000	[1],[2]	623,000	[1],[2]	894,000	[1],[2]	1,335,000	[1],[2]
Post-Modification Outstanding Recorded Investment	102,000	[1],[2]	604,000	[1],[2]	873,000	[1],[2]	1,315,000	[1],[2]
Total Difference in Recorded Investment	-2,000	[2]	-19,000	[2]	-21,000	[2]	-20,000	[2]
Principal Forgiveness [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Loans	0	[3]	1	[3]	0	[3]	1	[3]
Pre-Modification Outstanding Recorded Investment	0	[1],[3]	4,339,000	[1],[3]	0	[1],[3]	4,339,000	[1],[3]
Post-Modification Outstanding Recorded Investment	0	[1],[3]	4,339,000	[1],[3]	0	[1],[3]	4,339,000	[1],[3]
Total Difference in Recorded Investment	0	[3]	0	[3]	0	[3]	0	[3]
Maturity Date Extension [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Loans	0		1		1		1
Pre-Modification Outstanding Recorded Investment	0	[1]	751,000	[1]	1,019,000	[1]	751,000	[1]
Post-Modification Outstanding Recorded Investment	0	[1]	751,000	[1]	1,019,000	[1]	751,000	[1]
Total Difference in Recorded Investment	0		0		0		0
Commercial Real Estate [Member] | Principal Deferral [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Loans	1		0		1		3
Pre-Modification Outstanding Recorded Investment	129,000	[1]	0	[1]	129,000	[1]	1,541,000	[1]
Post-Modification Outstanding Recorded Investment	127,000	[1]	0	[1]	127,000	[1]	1,288,000	[1]
Total Difference in Recorded Investment	-2,000		0		-2,000		-253,000
Commercial Real Estate [Member] | Chapter 7 Bankruptcy [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Loans	0	[2]	4	[2]	0	[2]	7	[2]
Pre-Modification Outstanding Recorded Investment	0	[1],[2]	53,000	[1],[2]	0	[1],[2]	258,000	[1],[2]
Post-Modification Outstanding Recorded Investment	0	[1],[2]	51,000	[1],[2]	0	[1],[2]	255,000	[1],[2]
Total Difference in Recorded Investment	0	[2]	-2,000	[2]	0	[2]	-3,000	[2]
Commercial Real Estate [Member] | Principal Forgiveness [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Loans	0	[3]	1	[3]	0	[2]	1	[2]
Pre-Modification Outstanding Recorded Investment	0	[1],[3]	4,339,000	[1],[3]	0	[1],[3]	4,339,000	[1],[3]
Post-Modification Outstanding Recorded Investment	0	[1],[3]	4,339,000	[1],[3]	0	[1],[3]	4,339,000	[1],[3]
Total Difference in Recorded Investment	0	[3]	0	[3]	0	[2]	0	[2]
Commercial and Industrial [Member] | Principal Deferral [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Loans	'		'		0		1
Pre-Modification Outstanding Recorded Investment	'		'		0	[1]	392,000	[1]
Post-Modification Outstanding Recorded Investment	'		'		0	[1]	387,000	[1]
Total Difference in Recorded Investment	'		'		0		-5,000
Commercial and Industrial [Member] | Chapter 7 Bankruptcy [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Loans	'		'		1	[2]	1	[2]
Pre-Modification Outstanding Recorded Investment	'		'		287,000	[1],[2]	3,000	[1],[2]
Post-Modification Outstanding Recorded Investment	'		'		286,000	[1],[2]	3,000	[1],[2]
Total Difference in Recorded Investment	'		'		-1,000	[2]	0	[2]
Commercial and Industrial [Member] | Maturity Date Extension [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Loans	0		1		0		1
Pre-Modification Outstanding Recorded Investment	0	[1]	751,000	[1]	0	[1]	751,000	[1]
Post-Modification Outstanding Recorded Investment	0	[1]	751,000	[1]	0	[1]	751,000	[1]
Total Difference in Recorded Investment	0		0		0		0
Commercial Construction [Member] | Maturity Date Extension [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Loans	'		'		1		0
Pre-Modification Outstanding Recorded Investment	'		'		1,019,000	[1]	0	[1]
Post-Modification Outstanding Recorded Investment	'		'		1,019,000	[1]	0	[1]
Total Difference in Recorded Investment	'		'		0		0
Residential Mortgage [Member] | Principal Deferral [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Loans	'		'		0		2
Pre-Modification Outstanding Recorded Investment	'		'		0	[1]	153,000	[1]
Post-Modification Outstanding Recorded Investment	'		'		0	[1]	153,000	[1]
Total Difference in Recorded Investment	'		'		0		0
Residential Mortgage [Member] | Chapter 7 Bankruptcy [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Loans	1	[2]	2	[2]	5	[2]	8	[2]
Pre-Modification Outstanding Recorded Investment	52,000	[1],[2]	84,000	[1],[2]	329,000	[1],[2]	353,000	[1],[2]
Post-Modification Outstanding Recorded Investment	52,000	[1],[2]	75,000	[1],[2]	327,000	[1],[2]	344,000	[1],[2]
Total Difference in Recorded Investment	0	[2]	-9,000	[2]	-2,000	[2]	-9,000	[2]
Home Equity [Member] | Principal Deferral [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Loans	'		'		0		1
Pre-Modification Outstanding Recorded Investment	'		'		0	[1]	174,000	[1]
Post-Modification Outstanding Recorded Investment	'		'		0	[1]	45,000	[1]
Total Difference in Recorded Investment	'		'		0		-129,000
Home Equity [Member] | Chapter 7 Bankruptcy [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Loans	4	[2]	17	[2]	10	[2]	23	[2]
Pre-Modification Outstanding Recorded Investment	43,000	[1],[2]	486,000	[1],[2]	269,000	[1],[2]	648,000	[1],[2]
Post-Modification Outstanding Recorded Investment	41,000	[1],[2]	478,000	[1],[2]	251,000	[1],[2]	640,000	[1],[2]
Total Difference in Recorded Investment	-2,000	[2]	-8,000	[2]	-18,000	[2]	-8,000	[2]
Installment and Other Consumer [Member] | Chapter 7 Bankruptcy [Member]	'		'		'		'
Financing Receivable, Modifications [Line Items]	'		'		'		'
Number of Loans	1	[2]	0	[2]	1	[2]	6	[2]
Pre-Modification Outstanding Recorded Investment	9,000	[1],[2]	0	[1],[2]	9,000	[1],[2]	73,000	[1],[2]
Post-Modification Outstanding Recorded Investment	9,000	[1],[2]	0	[1],[2]	9,000	[1],[2]	73,000	[1],[2]
Total Difference in Recorded Investment	$0	[2]	$0	[2]	$0	[2]	$0	[2]
[1]	Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.
[2]	Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.
[3]	This loan had debt forgiveness of $0.1 million to the customer; however, the loan was previously charged off to a balance below the actual contractual balance.

Loans_and_Loans_Held_for_Sale_5

Loans and Loans Held for Sale - Summary of Nonperforming Assets of Defaulted TDRs (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
	Contract	Contract	Contract	Contract
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Defaults	0	4	1	7
Recorded Investment	$0	$79	$72	$215
Commercial Real Estate [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Defaults	0	0	0	0
Recorded Investment	0	0	0	0
Commercial and Industrial [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Defaults	0	0	0	0
Recorded Investment	0	0	0	0
Commercial Construction [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Defaults	0	0	0	0
Recorded Investment	0	0	0	0
Residential Real Estate [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Defaults	0	2	1	3
Recorded Investment	0	46	72	64
Home Equity [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Defaults	0	2	0	4
Recorded Investment	$0	$33	$0	$151

Loans_and_Loans_Held_for_Sale_6

Loans and Loans Held for Sale - Summary of Nonperforming Assets (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Nonperforming Assets	'	'
Nonaccrual loans	$9,698	$12,387
Nonaccrual TDRs	5,241	10,067
Total nonaccrual loans	14,939	22,454
OREO	431	410
Total Nonperforming Assets	$15,370	$22,864

Allowance_for_Loan_Losses_Age_

Allowance for Loan Losses - Age Analysis of Past Due Loans Segregated by Class of Loans (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Loans, Current	$3,706,327	$3,533,741
Loans, 30 to 59 Days Past Due	4,164	8,535
Loans, 60 to 89 Days Past Due	2,751	3,605
Total nonaccrual loans	14,939	22,454
Loans, Past Due, Total	21,854	34,594
Total Loans	3,728,181	3,568,335
Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Loans, Current	1,629,928	1,595,590
Loans, 30 to 59 Days Past Due	753	1,209
Loans, 60 to 89 Days Past Due	44	207
Total nonaccrual loans	5,658	10,750
Loans, Past Due, Total	6,455	12,166
Total Loans	1,636,383	1,607,756
Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Loans, Current	918,846	836,276
Loans, 30 to 59 Days Past Due	559	2,599
Loans, 60 to 89 Days Past Due	249	278
Total nonaccrual loans	2,537	3,296
Loans, Past Due, Total	3,345	6,173
Total Loans	922,191	842,449
Commercial Construction [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Loans, Current	185,428	139,133
Loans, 30 to 59 Days Past Due	0	1,049
Loans, 60 to 89 Days Past Due	1,014	751
Total nonaccrual loans	1,869	2,742
Loans, Past Due, Total	2,883	4,542
Total Loans	188,311	143,675
Residential Mortgage [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Loans, Current	488,551	481,260
Loans, 30 to 59 Days Past Due	1,022	828
Loans, 60 to 89 Days Past Due	898	1,666
Total nonaccrual loans	2,118	3,338
Loans, Past Due, Total	4,038	5,832
Total Loans	492,589	487,092
Home Equity [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Loans, Current	412,851	408,777
Loans, 30 to 59 Days Past Due	1,466	2,468
Loans, 60 to 89 Days Past Due	478	659
Total nonaccrual loans	1,431	2,291
Loans, Past Due, Total	3,375	5,418
Total Loans	416,226	414,195
Installment and Other Consumer [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Loans, Current	65,380	67,420
Loans, 30 to 59 Days Past Due	364	382
Loans, 60 to 89 Days Past Due	68	44
Total nonaccrual loans	26	37
Loans, Past Due, Total	458	463
Total Loans	65,838	67,883
Consumer Construction [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Loans, Current	3,541	3,149
Loans, 30 to 59 Days Past Due	0	0
Loans, 60 to 89 Days Past Due	0	0
Total nonaccrual loans	0	0
Loans, Past Due, Total	0	0
Total Loans	3,541	3,149
Loans Held for Sale [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Loans, Current	1,802	2,136
Loans, 30 to 59 Days Past Due	0	0
Loans, 60 to 89 Days Past Due	0	0
Total nonaccrual loans	1,300	0
Loans, Past Due, Total	1,300	0
Total Loans	$3,102	$2,136

Allowance_for_Loan_Losses_Reco

Allowance for Loan Losses - Recorded Investment in Commercial Loan Classes by Internally Assigned Risk Ratings (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'
Total recorded investment in commercial loan	$2,746,885	$2,593,880
Total percentage of recorded investment in commercial loan	100.00%	100.00%
Pass [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total recorded investment in commercial loan	2,603,835	2,430,926
Total percentage of recorded investment in commercial loan	94.80%	93.70%
Special Mention [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total recorded investment in commercial loan	92,123	106,779
Total percentage of recorded investment in commercial loan	3.40%	4.10%
Substandard [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total recorded investment in commercial loan	50,927	56,175
Total percentage of recorded investment in commercial loan	1.80%	2.20%
Commercial Real Estate [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total recorded investment in commercial loan	1,636,383	1,607,756
Total percentage of recorded investment in commercial loan	100.00%	100.00%
Commercial Real Estate [Member] | Pass [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total recorded investment in commercial loan	1,563,882	1,519,720
Total percentage of recorded investment in commercial loan	95.60%	94.50%
Commercial Real Estate [Member] | Special Mention [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total recorded investment in commercial loan	45,275	57,073
Total percentage of recorded investment in commercial loan	2.80%	3.60%
Commercial Real Estate [Member] | Substandard [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total recorded investment in commercial loan	27,226	30,963
Total percentage of recorded investment in commercial loan	1.60%	1.90%
Commercial and Industrial [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total recorded investment in commercial loan	922,191	842,449
Total percentage of recorded investment in commercial loan	100.00%	100.00%
Commercial and Industrial [Member] | Pass [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total recorded investment in commercial loan	872,686	792,029
Total percentage of recorded investment in commercial loan	94.60%	94.00%
Commercial and Industrial [Member] | Special Mention [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total recorded investment in commercial loan	33,966	34,085
Total percentage of recorded investment in commercial loan	3.70%	4.10%
Commercial and Industrial [Member] | Substandard [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total recorded investment in commercial loan	15,539	16,335
Total percentage of recorded investment in commercial loan	1.70%	1.90%
Commercial Construction [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total recorded investment in commercial loan	188,311	143,675
Total percentage of recorded investment in commercial loan	100.00%	100.00%
Commercial Construction [Member] | Pass [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total recorded investment in commercial loan	167,267	119,177
Total percentage of recorded investment in commercial loan	88.80%	82.90%
Commercial Construction [Member] | Special Mention [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total recorded investment in commercial loan	12,882	15,621
Total percentage of recorded investment in commercial loan	6.80%	10.90%
Commercial Construction [Member] | Substandard [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Total recorded investment in commercial loan	$8,162	$8,877
Total percentage of recorded investment in commercial loan	4.40%	6.20%

Allowance_for_Loan_Losses_Addi

Allowance for Loan Losses - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]	'	'
Evaluation for impairment of substandard and nonaccrual commercial loans	$500,000	'
Commercial real estate impaired loans fair value	34,700,000	'
Total amount of all impaired loans	46,209,000	52,856,000
Commercial real estate impaired loans needing current appraisals	600,000	'
Minimum [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Loans considered nonperforming (in days)	'90 days	'
Commercial Real Estate [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Commercial real estate impaired loans fair value	21,200,000	'
Percentage of total impaired loans comprised	46.00%	'
Total amount of all impaired loans	21,228,000	26,968,000
Charge offs on loans	$7,900,000	'

Allowance_for_Loan_Losses_Reco1

Allowance for Loan Losses - Recorded Investment in Consumer Loan Classes by Performing and Nonperforming Status (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded investment in consumer loan	$978,194	$972,319
% of Total	100.00%	100.00%
Accruing/Performing Financing Receivable [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded investment in consumer loan	974,619	966,653
% of Total	99.60%	99.40%
Nonaccruing/Nonperforming Financing Receivable [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded investment in consumer loan	3,575	5,666
% of Total	0.40%	0.60%
Residential Mortgage [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded investment in consumer loan	492,589	487,092
% of Total	100.00%	100.00%
Residential Mortgage [Member] | Accruing/Performing Financing Receivable [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded investment in consumer loan	490,471	483,754
% of Total	99.60%	99.30%
Residential Mortgage [Member] | Nonaccruing/Nonperforming Financing Receivable [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded investment in consumer loan	2,118	3,338
% of Total	0.40%	0.70%
Home Equity [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded investment in consumer loan	416,226	414,195
% of Total	100.00%	100.00%
Home Equity [Member] | Accruing/Performing Financing Receivable [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded investment in consumer loan	414,795	411,904
% of Total	99.70%	99.40%
Home Equity [Member] | Nonaccruing/Nonperforming Financing Receivable [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded investment in consumer loan	1,431	2,291
% of Total	0.30%	0.60%
Installment and Other Consumer [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded investment in consumer loan	65,838	67,883
% of Total	100.00%	100.00%
Installment and Other Consumer [Member] | Accruing/Performing Financing Receivable [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded investment in consumer loan	65,812	67,846
% of Total	99.90%	99.90%
Installment and Other Consumer [Member] | Nonaccruing/Nonperforming Financing Receivable [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded investment in consumer loan	26	37
% of Total	0.10%	0.10%
Consumer Construction [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded investment in consumer loan	3,541	3,149
% of Total	100.00%	100.00%
Consumer Construction [Member] | Accruing/Performing Financing Receivable [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded investment in consumer loan	3,541	3,149
% of Total	100.00%	100.00%
Consumer Construction [Member] | Nonaccruing/Nonperforming Financing Receivable [Member]	'	'
Financing Receivable, Recorded Investment [Line Items]	'	'
Recorded investment in consumer loan	$0	$0
% of Total	0.00%	0.00%

Allowance_for_Loan_Losses_Inve

Allowance for Loan Losses - Investments in Loans Considered to be Impaired and Related Information on Impaired Loans (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Without a related allowance recorded, Recorded Investment	$46,141	'	$46,141	'	$52,089
Without a related allowance, Unpaid Principal Balance	57,560	'	57,560	'	67,122
Without a related allowance recorded, Related Allowance	0	'	0	'	0
With a related allowance recorded, Recorded Investment	68	'	68	'	767
With a related allowance recorded, Unpaid Principal Balance	68	'	68	'	1,469
With a related allowance recorded, Related Allowance	58	'	58	'	97
Impaired Financing Receivable, Recorded Investment, Total	46,209	'	46,209	'	52,856
Impaired Financing Receivable, Unpaid Principal Balance, Total	57,628	'	57,628	'	68,591
Impaired Financing Receivable, Related Allowance	58	'	58	'	97
With a related allowance recorded, Average Recorded Investment	70	2,198	73	3,339	'
With a related allowance recorded, Interest Income Recognized	1	5	3	5	'
Without a related allowance recorded, Average Recorded Investment	46,253	68,606	46,719	69,784	'
Without a related allowance recorded, Interest Income Recognized	374	485	762	988	'
Impaired Financing Receivable, Average Recorded Investment, Total	46,323	70,804	46,792	73,123	'
Impaired Financing Receivable, Interest Income Recognized, Total	375	490	765	993	'
Commercial Real Estate [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Without a related allowance recorded, Recorded Investment	21,228	'	21,228	'	26,968
Without a related allowance, Unpaid Principal Balance	28,296	'	28,296	'	35,474
Without a related allowance recorded, Related Allowance	0	'	0	'	0
With a related allowance recorded, Recorded Investment	0	'	0	'	0
With a related allowance recorded, Unpaid Principal Balance	0	'	0	'	0
With a related allowance recorded, Related Allowance	0	'	0	'	0
Impaired Financing Receivable, Recorded Investment, Total	21,228	'	21,228	'	26,968
Impaired Financing Receivable, Unpaid Principal Balance, Total	28,296	'	28,296	'	35,474
Impaired Financing Receivable, Related Allowance	0	'	0	'	0
With a related allowance recorded, Average Recorded Investment	0	2,084	0	3,282	'
With a related allowance recorded, Interest Income Recognized	0	0	0	0	'
Without a related allowance recorded, Average Recorded Investment	21,382	30,956	21,980	31,181	'
Without a related allowance recorded, Interest Income Recognized	159	174	329	415	'
Impaired Financing Receivable, Average Recorded Investment, Total	21,382	33,040	21,980	34,463	'
Impaired Financing Receivable, Interest Income Recognized, Total	159	174	329	415	'
Commercial and Industrial [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Without a related allowance recorded, Recorded Investment	9,545	'	9,545	'	9,580
Without a related allowance, Unpaid Principal Balance	9,660	'	9,660	'	9,703
Without a related allowance recorded, Related Allowance	0	'	0	'	0
With a related allowance recorded, Recorded Investment	0	'	0	'	0
With a related allowance recorded, Unpaid Principal Balance	0	'	0	'	0
With a related allowance recorded, Related Allowance	0	'	0	'	0
Impaired Financing Receivable, Recorded Investment, Total	9,545	'	9,545	'	9,580
Impaired Financing Receivable, Unpaid Principal Balance, Total	9,660	'	9,660	'	9,703
Impaired Financing Receivable, Related Allowance	0	'	0	'	0
With a related allowance recorded, Average Recorded Investment	0	0	0	0	'
With a related allowance recorded, Interest Income Recognized	0	0	0	0	'
Without a related allowance recorded, Average Recorded Investment	9,317	12,452	9,066	12,449	'
Without a related allowance recorded, Interest Income Recognized	57	66	114	135	'
Impaired Financing Receivable, Average Recorded Investment, Total	9,317	12,452	9,066	12,449	'
Impaired Financing Receivable, Interest Income Recognized, Total	57	66	114	135	'
Commercial Construction [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Without a related allowance recorded, Recorded Investment	8,179	'	8,179	'	7,391
Without a related allowance, Unpaid Principal Balance	11,866	'	11,866	'	12,353
Without a related allowance recorded, Related Allowance	0	'	0	'	0
With a related allowance recorded, Recorded Investment	0	'	0	'	681
With a related allowance recorded, Unpaid Principal Balance	0	'	0	'	1,383
With a related allowance recorded, Related Allowance	0	'	0	'	25
Impaired Financing Receivable, Recorded Investment, Total	8,179	'	8,179	'	8,072
Impaired Financing Receivable, Unpaid Principal Balance, Total	11,866	'	11,866	'	13,736
Impaired Financing Receivable, Related Allowance	0	'	0	'	25
With a related allowance recorded, Average Recorded Investment	0	0	0	0	'
With a related allowance recorded, Interest Income Recognized	0	0	0	0	'
Without a related allowance recorded, Average Recorded Investment	8,279	16,376	8,301	16,854	'
Without a related allowance recorded, Interest Income Recognized	57	87	114	221	'
Impaired Financing Receivable, Average Recorded Investment, Total	8,279	16,376	8,301	16,854	'
Impaired Financing Receivable, Interest Income Recognized, Total	57	87	114	221	'
Consumer Real Estate [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Without a related allowance recorded, Recorded Investment	7,082	'	7,082	'	8,026
Without a related allowance, Unpaid Principal Balance	7,629	'	7,629	'	9,464
Without a related allowance recorded, Related Allowance	0	'	0	'	0
With a related allowance recorded, Recorded Investment	47	'	47	'	53
With a related allowance recorded, Unpaid Principal Balance	47	'	47	'	53
With a related allowance recorded, Related Allowance	47	'	47	'	53
Impaired Financing Receivable, Recorded Investment, Total	7,129	'	7,129	'	8,079
Impaired Financing Receivable, Unpaid Principal Balance, Total	7,676	'	7,676	'	9,517
Impaired Financing Receivable, Related Allowance	47	'	47	'	53
With a related allowance recorded, Average Recorded Investment	48	86	50	43	'
With a related allowance recorded, Interest Income Recognized	1	4	2	4	'
Without a related allowance recorded, Average Recorded Investment	7,166	8,708	7,260	9,194	'
Without a related allowance recorded, Interest Income Recognized	100	156	203	215	'
Impaired Financing Receivable, Average Recorded Investment, Total	7,214	8,794	7,310	9,237	'
Impaired Financing Receivable, Interest Income Recognized, Total	101	160	205	219	'
Other Consumer [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Without a related allowance recorded, Recorded Investment	107	'	107	'	124
Without a related allowance, Unpaid Principal Balance	109	'	109	'	128
Without a related allowance recorded, Related Allowance	0	'	0	'	0
With a related allowance recorded, Recorded Investment	21	'	21	'	33
With a related allowance recorded, Unpaid Principal Balance	21	'	21	'	33
With a related allowance recorded, Related Allowance	11	'	11	'	19
Impaired Financing Receivable, Recorded Investment, Total	128	'	128	'	157
Impaired Financing Receivable, Unpaid Principal Balance, Total	130	'	130	'	161
Impaired Financing Receivable, Related Allowance	11	'	11	'	19
With a related allowance recorded, Average Recorded Investment	22	28	23	14	'
With a related allowance recorded, Interest Income Recognized	0	1	1	1	'
Without a related allowance recorded, Average Recorded Investment	109	114	112	106	'
Without a related allowance recorded, Interest Income Recognized	1	2	2	2	'
Impaired Financing Receivable, Average Recorded Investment, Total	131	142	135	120	'
Impaired Financing Receivable, Interest Income Recognized, Total	$1	$3	$3	$3	'

Allowance_for_Loan_Losses_Summ

Allowance for Loan Losses - Summary of Allowance for Loan Losses (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'
Balance at beginning of period	$46,616	$45,936	$46,255	$46,484
Charge-offs	-3,746	-2,929	-4,721	-7,063
Recoveries	4,844	2,075	5,891	3,354
Net (Charge-offs)/ Recoveries	1,098	-854	1,170	-3,709
Provision for loan losses	-1,134	1,023	-845	3,330
Balance at End of Period	46,580	46,105	46,580	46,105
Commercial Real Estate [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'
Balance at beginning of period	19,880	24,442	18,921	25,246
Charge-offs	-1,737	-1,170	-2,004	-2,809
Recoveries	1,294	1,572	1,834	2,322
Net (Charge-offs)/ Recoveries	-443	402	-170	-487
Provision for loan losses	1,296	-1,360	1,982	-1,275
Balance at End of Period	20,733	23,484	20,733	23,484
Commercial and Industrial [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'
Balance at beginning of period	13,979	8,676	14,433	7,759
Charge-offs	-743	-563	-1,033	-1,923
Recoveries	2,936	190	3,249	290
Net (Charge-offs)/ Recoveries	2,193	-373	2,216	-1,633
Provision for loan losses	-3,168	820	-3,645	2,997
Balance at End of Period	13,004	9,123	13,004	9,123
Commercial Construction [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'
Balance at beginning of period	5,183	6,603	5,374	7,500
Charge-offs	-664	-54	-692	-443
Recoveries	324	2	375	55
Net (Charge-offs)/ Recoveries	-340	-52	-317	-388
Provision for loan losses	-84	-739	-298	-1,300
Balance at End of Period	4,759	5,812	4,759	5,812
Consumer Real Estate [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'
Balance at beginning of period	6,408	5,259	6,362	5,058
Charge-offs	-425	-743	-547	-1,237
Recoveries	164	225	223	508
Net (Charge-offs)/ Recoveries	-261	-518	-324	-729
Provision for loan losses	558	1,914	667	2,326
Balance at End of Period	6,705	6,655	6,705	6,655
Other Consumer [Member]	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'
Balance at beginning of period	1,166	956	1,165	921
Charge-offs	-177	-399	-445	-651
Recoveries	126	86	210	179
Net (Charge-offs)/ Recoveries	-51	-313	-235	-472
Provision for loan losses	264	388	449	582
Balance at End of Period	$1,379	$1,031	$1,379	$1,031

Allowance_for_Loan_Losses_Summ1

Allowance for Loan Losses - Summary of Allowance for Loan Losses and Recorded Investments (Detail) (USD $)	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Allowance for Loan Losses, Individually Evaluated for Impairment	$58	'	$97	'	'	'
Allowance for Loan Losses, Collectively Evaluated for Impairment	46,522	'	46,158	'	'	'
Total Allowance for Loan Losses	46,580	46,616	46,255	46,105	45,936	46,484
Portfolio Loans, Individually Evaluated for Impairment	46,209	'	52,856	'	'	'
Portfolio Loans, Collectively Evaluated for Impairment	3,678,870	'	3,513,343	'	'	'
Total Portfolio Loans	3,725,079	'	3,566,199	'	'	'
Commercial Real Estate [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Allowance for Loan Losses, Individually Evaluated for Impairment	0	'	0	'	'	'
Allowance for Loan Losses, Collectively Evaluated for Impairment	20,733	'	18,921	'	'	'
Total Allowance for Loan Losses	20,733	19,880	18,921	23,484	24,442	25,246
Portfolio Loans, Individually Evaluated for Impairment	21,228	'	26,968	'	'	'
Portfolio Loans, Collectively Evaluated for Impairment	1,615,155	'	1,580,788	'	'	'
Total Portfolio Loans	1,636,383	'	1,607,756	'	'	'
Commercial and Industrial [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Allowance for Loan Losses, Individually Evaluated for Impairment	0	'	0	'	'	'
Allowance for Loan Losses, Collectively Evaluated for Impairment	13,004	'	14,433	'	'	'
Total Allowance for Loan Losses	13,004	13,979	14,433	9,123	8,676	7,759
Portfolio Loans, Individually Evaluated for Impairment	9,545	'	9,580	'	'	'
Portfolio Loans, Collectively Evaluated for Impairment	912,646	'	832,869	'	'	'
Total Portfolio Loans	922,191	'	842,449	'	'	'
Commercial Construction [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Allowance for Loan Losses, Individually Evaluated for Impairment	0	'	25	'	'	'
Allowance for Loan Losses, Collectively Evaluated for Impairment	4,759	'	5,349	'	'	'
Total Allowance for Loan Losses	4,759	5,183	5,374	5,812	6,603	7,500
Portfolio Loans, Individually Evaluated for Impairment	8,179	'	8,072	'	'	'
Portfolio Loans, Collectively Evaluated for Impairment	180,132	'	135,603	'	'	'
Total Portfolio Loans	188,311	'	143,675	'	'	'
Consumer Real Estate [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Allowance for Loan Losses, Individually Evaluated for Impairment	47	'	53	'	'	'
Allowance for Loan Losses, Collectively Evaluated for Impairment	6,658	'	6,309	'	'	'
Total Allowance for Loan Losses	6,705	6,408	6,362	6,655	5,259	5,058
Portfolio Loans, Individually Evaluated for Impairment	7,129	'	8,079	'	'	'
Portfolio Loans, Collectively Evaluated for Impairment	905,227	'	896,357	'	'	'
Total Portfolio Loans	912,356	'	904,436	'	'	'
Other Consumer [Member]	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Line Items]	'	'	'	'	'	'
Allowance for Loan Losses, Individually Evaluated for Impairment	11	'	19	'	'	'
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,368	'	1,146	'	'	'
Total Allowance for Loan Losses	1,379	1,166	1,165	1,031	956	921
Portfolio Loans, Individually Evaluated for Impairment	128	'	157	'	'	'
Portfolio Loans, Collectively Evaluated for Impairment	65,710	'	67,726	'	'	'
Total Portfolio Loans	$65,838	'	$67,883	'	'	'

Derivative_Instruments_and_Hed2

Derivative Instruments and Hedging Activities - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Period for commitments	'60 days

Derivative_Instruments_and_Hed3

Derivative Instruments and Hedging Activities - Value of Derivative Assets and Derivative Liabilities (Detail) (Not Designated as Hedging Instruments [Member], USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Derivatives not Designated as Hedging Instruments	'	'
Fair value, Derivatives (included in Other Assets)	$14,082	$13,698
Fair value, Derivatives (included in Other Liabilities)	14,050	13,647
Other Assets [Member] | Interest Rate Swap Contracts-Commercial Loans [Member]	'	'
Derivatives not Designated as Hedging Instruments	'	'
Fair value, Derivatives (included in Other Assets)	14,082	13,698
Notional amount, Derivatives (included in Other Assets)	245,865	261,754
Collateral posted, Derivatives (included in Other Assets)	0	0
Other Assets [Member] | Interest Rate Lock Commitments - Mortgage Loans [Member]	'	'
Derivatives not Designated as Hedging Instruments	'	'
Fair value, Derivatives (included in Other Assets)	292	85
Notional amount, Derivatives (included in Other Assets)	9,594	3,989
Other Assets [Member] | Forward Sale Contracts-Mortgage Loans [Member]	'	'
Derivatives not Designated as Hedging Instruments	'	'
Fair value, Derivatives (included in Other Assets)	0	34
Notional amount, Derivatives (included in Other Assets)	0	5,250
Other Liabilities [Member] | Interest Rate Swap Contracts-Commercial Loans [Member]	'	'
Derivatives not Designated as Hedging Instruments	'	'
Collateral posted, Derivatives (included in Other Assets)	11,559	12,611
Fair value, Derivatives (included in Other Liabilities)	14,050	13,647
Notional amount, Derivatives (included in Other Liabilities)	245,865	261,754
Other Liabilities [Member] | Interest Rate Lock Commitments - Mortgage Loans [Member]	'	'
Derivatives not Designated as Hedging Instruments	'	'
Fair value, Derivatives (included in Other Liabilities)	0	0
Notional amount, Derivatives (included in Other Liabilities)	0	0
Other Liabilities [Member] | Forward Sale Contracts-Mortgage Loans [Member]	'	'
Derivatives not Designated as Hedging Instruments	'	'
Fair value, Derivatives (included in Other Liabilities)	59	0
Notional amount, Derivatives (included in Other Liabilities)	$7,210	$0

Derivative_Instruments_and_Hed4

Derivative Instruments and Hedging Activities - Schedule of Gross Amounts of Derivative Assets and Derivative Liabilities (Detail) (Not Designated as Hedging Instruments [Member], USD $)	Jun. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Not Designated as Hedging Instruments [Member]	'		'
Derivative Asset [Abstract]	'		'
Gross amounts recognized	$14,349		$14,012
Gross amounts offset	-267		-314
Net amounts presented in the Consolidated Balance Sheets	14,082		13,698
Gross amounts not offset	0	[1]	0	[1]
Net Amount	14,082		13,698
Derivative Liability [Abstract]	'		'
Gross amounts recognized	14,317		13,961
Gross amounts offset	-267		-314
Net amounts presented in the Consolidated Balance Sheets	14,050		13,647
Gross amounts not offset	-11,559	[1]	-12,611	[1]
Net Amount	$2,491		$1,036
[1]	Amounts represent posted collateral.

Derivative_Instruments_and_Hed5

Derivative Instruments and Hedging Activities - Amount of Gain or Loss Recognized in Income on Derivatives (Detail) (Not Designated as Hedging Instruments [Member], USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Total Derivatives Gain (Loss)	$124	$88	$95	($243)
Interest Rate Swap Contracts-Commercial Loans [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Total Derivatives Gain (Loss)	-11	-27	-19	-156
Interest Rate Lock Commitments - Mortgage Loans [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Total Derivatives Gain (Loss)	199	-266	207	-492
Forward Sale Contracts-Mortgage Loans [Member]	'	'	'	'
Derivative Instruments, Gain (Loss) [Line Items]	'	'	'	'
Total Derivatives Gain (Loss)	($64)	$381	($93)	$405

Borrowings_Additional_Informat

Borrowings - Additional Information (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Long Term And Short Term Debt [Line Items]	'	'
Total long-term debt outstanding at a fixed rate	$17,300,000	'
Total long-term debt outstanding at a variable rate	48,700,000	'
Capital lease	200,000	'
Total borrowings	205,400,000	161,600,000
Long-term borrowings	20,400,000	'
Short-term borrowings	185,000,000	'
Federal Home Loan Bank Advances [Member]	'	'
Long Term And Short Term Debt [Line Items]	'	'
Maximum borrowing capacity	1,600,000,000	'
Remaining borrowing capacity	$1,400,000,000	'

Borrowings_Summary_of_Informat

Borrowings - Summary of Information Pertaining to Borrowings (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Long Term And Short Term Debt [Line Items]	'	'
Short-term borrowings	$210,269	$173,847
Long-term borrowings	66,255	67,429
Total Borrowings	276,524	241,276
Short-term borrowings, Weighted Average Rate	0.25%	0.24%
Long-term borrowings, Weighted Average Rate	2.78%	2.80%
Total Borrowings, Weighted Average Rate	0.85%	0.96%
Securities Sold under Repurchase Agreements [Member]	'	'
Long Term And Short Term Debt [Line Items]	'	'
Short-term borrowings	25,269	33,847
Short-term borrowings, Weighted Average Rate	0.01%	0.01%
Short-Term Borrowings [Member]	'	'
Long Term And Short Term Debt [Line Items]	'	'
Short-term borrowings	185,000	140,000
Short-term borrowings, Weighted Average Rate	0.28%	0.30%
Other Long-Term Borrowings [Member]	'	'
Long Term And Short Term Debt [Line Items]	'	'
Long-term borrowings	20,636	21,810
Long-term borrowings, Weighted Average Rate	2.98%	3.01%
Junior Subordinated Debt Securities [Member]	'	'
Long Term And Short Term Debt [Line Items]	'	'
Long-term borrowings	$45,619	$45,619
Long-term borrowings, Weighted Average Rate	2.69%	2.70%

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Commitments and Contingencies Disclosure [Abstract]	'	'
Allowance for unfunded commitments	$3.10	$2.90

Commitments_and_Contingencies_2

Commitments and Contingencies - Commitments and Letters of Credit (Detail) (USD $)	6 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Commitment And Contingencies [Line Items]	'	'
Commitments and letters of credit	$1,195,938	$1,117,168
Commitments to Extend Credit [Member]	'	'
Commitment And Contingencies [Line Items]	'	'
Commitments and letters of credit	1,117,511	1,038,529
Standby Letters of Credit [Member]	'	'
Commitment And Contingencies [Line Items]	'	'
Commitments and letters of credit	$78,427	$78,639

Other_Comprehensive_Income_Oth

Other Comprehensive Income - Other Comprehensive Income (Detail) (USD $)	3 Months Ended				6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Pre-Tax Amount	'		'		'		'
Change in unrealized gains/losses on securities available-for-sale	$5,401		($12,061)		$9,876		($13,829)
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income	-40	[1]	0	[1]	-41	[1]	-2	[1]
Adjustment to funded status of employee benefit plans	211		598		423		1,196
Other Comprehensive Income (Loss)	5,572		-11,463		10,258		-12,635
Tax (Expense) Benefit	'		'		'		'
Change in unrealized gains/losses on securities available-for-sale	-1,891		4,221		-3,457		4,840
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income	15	[1]	0	[1]	15	[1]	1	[1]
Adjustment to funded status of employee benefit plans	-74		-210		-148		-419
Other Comprehensive Income (Loss)	-1,950		4,011		-3,590		4,422
Net of Tax Amount	'		'		'		'
Change in unrealized gains/losses on securities available-for-sale	3,510		-7,840		6,419		-8,989
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income	-25	[1]	0	[1]	-26	[1]	-1	[1]
Adjustment to funded status of employee benefit plans	137		388		275		777
Other Comprehensive Income (Loss)	$3,622		($7,452)		$6,668		($8,213)
[1]	Reclassification adjustments are comprised of realized security gains. The gains have been reclassified out of accumulated other comprehensive income (loss) and have affected certain lines in the Consolidated Statements of Comprehensive Income as follows; the pre-tax amount is included in securities gains-net, the tax expense amount is included in the provision for income taxes and the net of tax amount is included in net income.

Employee_Benefits_Additional_I

Employee Benefits - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2014
Compensation and Retirement Disclosure [Abstract]	'
Number of consecutive years of employee's compensation	'5 years
Number of total years of employee's compensation	'10 years
Expected long-term rate of return on plan assets	8.00%

Employee_Benefits_Components_o

Employee Benefits - Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Components of Net Periodic Pension Cost	'	'	'	'
Service cost—benefits earned during the period	$631	$708	$1,262	$1,416
Interest cost on projected benefit obligation	1,106	996	2,212	1,992
Expected return on plan assets	-1,735	-1,565	-3,470	-3,130
Amortization of prior service cost (credit)	-35	-34	-70	-68
Recognized net actuarial loss	209	588	418	1,176
Net Periodic Pension Expense	$176	$693	$352	$1,386

Segments_Additional_Informatio

Segments - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2014
	Segment
Segment Reporting [Abstract]	'
Number of reportable segment	3

Segments_Total_Assets_by_Repor

Segments - Total Assets by Reportable Operating Segment (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Segment Reporting, Asset Reconciling Item [Line Items]	'	'
Total Assets	$4,788,030	$4,533,190
Community Banking [Member]	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'
Total Assets	4,778,233	4,524,939
Insurance [Member]	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'
Total Assets	7,715	6,926
Wealth Management [Member]	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'
Total Assets	$2,082	$1,325

Segments_Financial_Information

Segments - Financial Information of Segments (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'	'
Interest income	$39,872	$38,553	$78,537	$76,396
Interest expense	3,017	3,957	6,091	8,131
NET INTEREST INCOME	36,855	34,596	72,446	68,265
Provision for loan losses	-1,134	1,023	-845	3,330
Noninterest income	11,771	12,867	23,187	27,673
Noninterest expense	29,043	27,077	56,821	57,325
Depreciation expense	825	896	1,645	1,833
Amortization of intangible assets	297	413	613	844
Provision (benefit) for income taxes	4,875	3,951	8,646	6,173
Net Income	14,720	14,103	28,753	26,433
Operating Segments [Member] | Community Banking [Member]	'	'	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'	'
Interest income	39,845	38,505	78,475	76,194
Interest expense	3,415	4,663	6,897	9,454
NET INTEREST INCOME	36,430	33,842	71,578	66,740
Provision for loan losses	-1,134	1,023	-845	3,330
Noninterest income	7,522	8,467	14,375	18,823
Noninterest expense	25,092	21,786	49,066	46,427
Depreciation expense	805	876	1,607	1,795
Amortization of intangible assets	274	387	566	792
Provision (benefit) for income taxes	4,637	4,592	8,002	7,438
Net Income	14,278	13,645	27,557	25,781
Operating Segments [Member] | Insurance [Member]	'	'	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'	'
Interest income	0	0	0	1
Interest expense	0	0	0	0
NET INTEREST INCOME	0	0	0	1
Provision for loan losses	0	0	0	0
Noninterest income	1,245	1,349	2,766	2,947
Noninterest expense	1,044	1,105	2,199	2,552
Depreciation expense	13	12	25	22
Amortization of intangible assets	13	13	25	26
Provision (benefit) for income taxes	61	77	181	122
Net Income	114	142	336	226
Operating Segments [Member] | Wealth Management [Member]	'	'	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'	'
Interest income	136	135	310	273
Interest expense	0	0	0	0
NET INTEREST INCOME	136	135	310	273
Provision for loan losses	0	0	0	0
Noninterest income	2,828	2,812	5,764	5,386
Noninterest expense	2,442	2,389	4,716	4,878
Depreciation expense	7	8	13	16
Amortization of intangible assets	10	13	22	26
Provision (benefit) for income taxes	177	221	463	313
Net Income	328	316	860	426
Eliminations [Member]	'	'	'	'
Segment Reporting, Asset Reconciling Item [Line Items]	'	'	'	'
Interest income	-109	-87	-248	-72
Interest expense	-398	-706	-806	-1,323
NET INTEREST INCOME	289	619	558	1,251
Provision for loan losses	0	0	0	0
Noninterest income	176	239	282	517
Noninterest expense	465	1,797	840	3,468
Depreciation expense	0	0	0	0
Amortization of intangible assets	0	0	0	0
Provision (benefit) for income taxes	0	-939	0	-1,700
Net Income	$0	$0	$0	$0