S&T Bancorp (STBA) 10-Q 5 Aug 15 2015 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Jul. 31, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q2
Entity Registrant Name	S&T BANCORP INC
Entity Central Index Key	719,220
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		34,811,636

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
ASSETS
Cash and due from banks, including interest-bearing deposits of $83,701 and $57,048 at June 30, 2015 and December 31, 2014	$ 146,582	$ 109,580
Securities available-for-sale, at fair value	666,624	640,273
Loans held for sale	13,634	2,970
Portfolio loans, net of unearned income	4,798,498	3,868,746
Allowance for loan losses	(48,814)	(47,911)
Portfolio loans, net	4,749,684	3,820,835
Bank owned life insurance	79,314	62,252
Premises and equipment, net	49,032	38,166
Federal Home Loan Bank and other restricted stock, at cost	23,553	15,135
Goodwill	291,204	175,820
Other intangible assets, net	7,479	2,631
Other assets	106,622	97,024
Total Assets	6,133,728	4,964,686
LIABILITIES
Noninterest-bearing demand	1,182,124	1,083,919
Interest-bearing demand	703,797	335,099
Money market	633,175	376,612
Savings	1,093,057	1,027,095
Certificates of deposit	1,247,262	1,086,117
Total Deposits	4,859,415	3,908,842
Securities sold under repurchase agreements	46,235	30,605
Short-term borrowings	230,975	290,000
Long-term borrowings	118,228	19,442
Junior subordinated debt securities	45,619	45,619
Other liabilities	62,027	61,789
Total Liabilities	5,362,499	4,356,297
SHAREHOLDERS' EQUITY
Common stock ($2.50 par value) Authorized—50,000,000 shares Issued—36,130,480 shares at June 30, 2015 and 31,197,365 at December 31, 2014 Outstanding—34,812,723 shares at June 30, 2015 and 29,796,397 shares at December 31, 2014	90,326	77,993
Additional paid-in capital	209,709	78,818
Retained earnings	521,056	504,060
Accumulated other comprehensive (loss) income	(13,521)	(13,833)
Treasury stock (1,317,757 shares at June 30, 2015 and 1,400,968 shares at December 31, 2014, at cost)	(36,341)	(38,649)
Total Shareholders’ Equity	771,229	608,389
Total Liabilities and Shareholders’ Equity	$ 6,133,728	$ 4,964,686

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Cash and due from banks, interest-bearing amounts	$ 83,701	$ 57,048
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	36,130,480	31,197,365
Common stock, shares outstanding	34,812,723	29,796,397
Treasury stock, shares	1,317,757	1,400,968

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
INTEREST INCOME
Loans, including fees	$ 48,933	$ 36,614	$ 88,859	$ 72,263
Investment securities:
Taxable	2,394	2,060	4,777	3,960
Tax-exempt	998	979	2,018	1,908
Dividends	286	219	872	406
Total Interest Income	52,611	39,872	96,526	78,537
INTEREST EXPENSE
Deposits	3,051	2,476	6,058	4,986
Borrowings and junior subordinated debt securities	749	541	1,398	1,105
Total Interest Expense	3,800	3,017	7,456	6,091
NET INTEREST INCOME	48,811	36,855	89,070	72,446
Provision for loan losses	2,059	(1,134)	3,266	(845)
Net Interest Income After Provision for Loan Losses	46,752	37,989	85,804	73,291
NONINTEREST INCOME
Securities (losses) gains, net	(34)	40	(34)	41
Debit and credit card fees	3,020	2,724	5,736	5,226
Wealth management fees	2,930	2,837	5,853	5,792
Service charges on deposit accounts	2,877	2,574	5,459	5,083
Insurance fees	1,391	1,425	3,041	3,102
Mortgage banking	782	264	1,308	396
Other	2,417	1,907	4,104	3,547
Total Noninterest Income	13,383	11,771	25,467	23,187
NONINTEREST EXPENSE
Salaries and employee benefits	17,455	15,772	34,235	31,148
Net occupancy	2,682	1,984	5,270	4,214
Data processing	2,555	2,219	4,876	4,314
Furniture and equipment	1,582	1,277	2,808	2,548
Marketing	1,193	960	2,009	1,578
Other taxes	1,159	893	2,002	1,524
Merger related expenses	866	0	3,167	0
FDIC insurance	808	579	1,503	1,210
Professional services and legal	801	875	1,324	1,538
Other	6,348	5,606	11,876	11,005
Total Noninterest Expense	35,449	30,165	69,070	59,079
Income Before Taxes	24,686	19,595	42,201	37,399
Provision for income taxes	6,498	4,875	11,178	8,646
Net Income	$ 18,188	$ 14,720	$ 31,023	$ 28,753
Earnings per share—basic (in dollars per share)	$ 0.52	$ 0.49	$ 0.94	$ 0.97
Earnings per share—diluted (in dollars per share)	0.52	0.49	0.94	0.97
Dividends declared per share (in dollars per share)	$ 0.18	$ 0.17	$ 0.36	$ 0.33
Comprehensive Income	$ 14,695	$ 18,343	$ 31,335	$ 35,421

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive (Loss)/Income [Member]	Treasury Stock [Member]
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
Balance at Jun. 30, 2014	597,187	77,993	78,570	485,277	(6,026)	(38,627)
Balance at Dec. 31, 2014	608,389	77,993	78,818	504,060	(13,833)	(38,649)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	31,023			31,023
Other comprehensive income (loss), net of tax	312				312
Cash dividends declared	(11,608)			(11,608)
Common stock issued in acquisition	142,469	12,333	130,136
Treasury stock issued for restricted awards	(111)			(2,419)		2,308
Recognition of restricted stock compensation expense	858		858
Tax benefit from stock-based compensation	29		29
Issuance costs	(132)		(132)
Balance at Jun. 30, 2015	$ 771,229	$ 90,326	$ 209,709	$ 521,056	$ (13,521)	$ (36,341)

Consolidated Statements of Cha6

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Dividends declared per share (in dollars per share)	$ 0.36	$ 0.33
Common stock issued in acquisition, shares	4,933,115
Treasury stock issued for restricted awards, net of forfeitures	87,841	80,455
Forfeitures of restricted stock, shares	4,630	20,976

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
OPERATING ACTIVITIES
Net income	$ 31,023	$ 28,753
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	3,266	(845)
Provision for unfunded loan commitments	605	182
Depreciation, amortization and accretion	388	2,309
Net amortization of discounts and premiums on securities	1,802	1,898
Stock-based compensation expense	769	395
Securities losses (gains), net	34	(41)
Tax benefit from stock-based compensation	(29)	0
Mortgage loans originated for sale	(52,075)	(13,057)
Proceeds from the sale of loans	42,008	13,475
Gain on the sale of loans, net	(597)	(85)
Net increase in interest receivable	(2,542)	(243)
Net decrease in interest payable	(475)	(186)
Net decrease in other assets	1,854	10,016
Net (decrease) increase in other liabilities	(811)	1,199
Net Cash Provided by Operating Activities	25,220	43,770
INVESTING ACTIVITIES
Purchases of securities available-for-sale	(54,754)	(108,845)
Proceeds from maturities, prepayments and calls of securities available-for-sale	26,096	36,343
Proceeds from sales of securities available-for-sale	11,119	1,418
Net purchases of Federal Home Loan Bank stock	(334)	(2,189)
Net increase in loans	(141,911)	(169,209)
Proceeds from sale of loans not originated for resale	0	4,108
Purchases of premises and equipment	(2,465)	(1,719)
Proceeds from the sale of premises and equipment	27	64
Net cash paid in excess of cash acquired from bank merger	(16,347)	0
Net Cash Used in Investing Activities	(178,569)	(240,029)
FINANCING ACTIVITIES
Net increase in core deposits	297,340	141,888
Net (decrease) increase in certificates of deposit	(68,397)	50,972
Net increase (decrease) in securities sold under repurchase agreements	15,630	(8,578)
Net (decrease) increase in short-term borrowings	(127,686)	45,000
Proceeds from long-term borrowings	100,000	0
Repayments of long-term borrowings	(1,214)	(1,174)
Repayment of junior subordinated debt	(13,500)	0
Treasury shares issued-net	(111)	(160)
Issuance costs	(132)	0
Cash dividends paid to common shareholders	(11,608)	(9,810)
Tax benefit from stock-based compensation	29	0
Net Cash Provided by Financing Activities	190,351	218,138
Net increase in cash and cash equivalents	37,002	21,879
Cash and cash equivalents at beginning of period	109,580	108,356
Cash and Cash Equivalents at End of Period	146,582	130,235
Supplemental Disclosures
Loans transferred to held for sale	0	1,300
Interest paid	7,619	6,278
Income taxes paid, net of refunds	9,275	8,400
Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed)	43,433
Net assets acquired from bank merger, excluding cash and cash equivalents		0
Transfers of loans to other real estate owned	$ 137	$ 274

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2015
Accounting Policies [Abstract]
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, 2014 , filed with the Securities and Exchange Commission, or SEC, on February 20, 2015. 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 Repurchase-To-Maturity Transactions, Repurchase Financings, and Disclosures In June 2014, the Financial Accounting Standards Board, or FASB, issued ASU No. 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures which introduces two accounting changes to the Transfers and Servicing guidance (Topic 860). Repurchase-to-maturity transactions will be accounted for as secured borrowing transactions on the balance sheet and for repurchase financing arrangements, an entity will account separately for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty. This will also generally result in secured borrowing accounting for the repurchase agreement. With respect to disclosures, a transferor is required to disclose information about transactions accounted for as a sale in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets through an agreement with the transferee. Additionally, new disclosures are required for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions that are accounted for as secured borrowings. The new disclosure for transactions accounted for as secured borrowings is required for interim periods beginning after March 15, 2015. These new disclosures are included in Note 9. Borrowings. The adoption of this ASU had no impact on our results of operations or financial position. 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 was permitted. The adoption of this ASU had no 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 was permitted. The adoption of this ASU had no 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 was permitted. This ASU did not have a material impact on our results of operations or financial position. We did not adopt the proportional amortization method. Refer to Note 14 for additional disclosure. Recently Issued Accounting Standards Updates not yet Adopted Intangibles – Goodwill and Other – Internal-Use Software: Customer's Accounting for Fees Paid in a Cloud Computing Arrangement In April 2015, the FASB issued ASU No. 2015-05, Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Customer's Accounting for Fees Paid in a Cloud Computing Arrangement. The main provisions of ASU 2015-05 provide a basis for evaluating whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, then the arrangement should be accounted for as a service contract. 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. Interest – Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs In April 2015, the FASB issued ASU No. 2015-03, Interest – Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The amendments in this ASU require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The standard is required to be adopted by public business entities in annual periods beginning on or after December 15, 2016. We do not expect that this ASU will have a material impact on our results of operations or financial position. Consolidation: Amendments to the Consolidation Analysis In April 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis. The amendments in this ASU affect reporting entities that are required to evaluate whether they should consolidate certain legal entities. All legal entities are subject to reevaluation under the revised consolidation model. Specifically, the amendments: 1) Modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities (VIEs) or voting interest entities, 2) Eliminate the presumption that a general partner should consolidate a limited partnership, 3) Affect the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships, 4) Provide a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2A-7 of the Investment Company Act of 1940 for registered money market funds. The amendments in this ASU are effective for public business entities for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. We are currently evaluating the impact that these amendments may have on our consolidated financial statements. We do not expect that this ASU will have a material impact on our results of operations or financial position. Income Statement – Extraordinary and Unusual Items: Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary In January 2015, the FASB issued ASU No. 2015-01, Income Statement – Extraordinary and Unusual Items (Subtopic 225-20): Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary. The amendments in this ASU eliminate from GAAP the concept of extraordinary items and eliminate the requirements for reporting entities to consider whether an underlying event or transaction is extraordinary. The presentation and disclosure guidance for items that are unusual in nature or occur infrequently will be retained and will be expanded to include items that are both unusual in nature and infrequently occurring. The standard is required to be adopted by public business entities in annual periods beginning on or after December 15, 2015. We do not expect that this ASU will have a material impact on our results of operations or financial position.

Business Combinations

Business Combinations	6 Months Ended
	Jun. 30, 2015
Business Combinations [Abstract]
Business Combinations	On March 4, 2015, we completed the acquisition of 100 percent of the voting shares of Integrity Bancshares, Inc., or Integrity, located in Camp Hill, Pennsylvania, in a tax-free reorganization transaction structured as a merger of Integrity with and into S&T, with S&T being the surviving entity. As a result of the Integrity merger, or the Merger, Integrity Bank, the wholly owned subsidiary bank of Integrity, became a separate wholly owned subsidiary bank of S&T. The merger of Integrity Bank into S&T Bank, with S&T Bank surviving the merger, and related system conversion occurred on May 8, 2015. Integrity shareholders were entitled to elect to receive for each share of Integrity common stock either $52.50 in cash or 2.0627 shares of S&T common stock subject to allocation and proration procedures in the merger agreement. The total purchase price was approximately $172.0 million which included $29.5 million of cash and 4,933,115 S&T common shares at a fair value of $28.88 per share. The fair value of $28.88 per share of S&T common stock was based on the March 4, 2015 closing price. The Merger was accounted for under the acquisition method of accounting and our consolidated financial statements include all Integrity Bank transactions from March 4, 2015, until it was merged into S&T Bank on May 8, 2015. The assets acquired and liabilities assumed were recorded at their respective fair values and represent management’s estimates based on available information. During the three months ended June 30, 2015, an additional $0.6 million of purchase accounting adjustments were recognized that increased goodwill. The change to goodwill primarily related to a fair value adjustment made on land acquired in the Merger where we own a branch office. Goodwill of $115.4 million was calculated as the excess of the consideration exchanged over the fair value of the identifiable net assets acquired. The goodwill arising from the Merger consists largely of the synergies and economies of scale expected from combining the operations of S&T and Integrity. All of the goodwill was assigned to our Community Banking segment. The goodwill recognized will not be deductible for tax purposes. The following table summarizes total consideration, assets acquired and liabilities assumed as of June 30, 2015: (dollars in thousands) Consideration Paid Cash $ 29,510 Common stock 142,469 Fair Value of Total Consideration $ 171,979 Fair Value of Assets Acquired Cash and cash equivalents $ 13,163 Securities and other investments 11,502 Loans 788,687 Bank owned life insurance 15,974 Premises and equipment 10,855 Core deposit intangible 5,713 Other assets 19,555 Total Assets Acquired 865,449 Fair Value of Liabilities Assumed Deposits 722,308 Borrowings 82,286 Other liabilities 4,259 Total Liabilities Assumed 808,853 Total Fair Value of Identifiable Net Assets 56,596 Goodwill $ 115,383 Loans acquired in the Merger were recorded at fair value with no carryover of the related allowance for loan losses. Determining the fair value of the loans involves estimating the amount and timing of principal and interest cash flows expected to be collected on the loans and discounting those cash flows at a market rate of interest. Loans acquired with evidence of credit quality deterioration were evaluated and not considered to be significant. The fair value of the loans acquired was $788.7 million net of a $14.8 million discount. The discount may be accreted to interest income over the remaining contractual life of the loans. Acquired loans included $331.6 million of commercial real estate, or CRE, $184.2 million of commercial and industrial, or C&I, $92.4 million of commercial construction, $116.9 million of residential mortgage, $25.6 million of home equity, $36.1 million of installment and other consumer and $1.9 million of consumer construction. Direct costs related to the Merger were expensed as incurred. During the six months ended June 30, 2015, we recognized $3.2 million of merger related expenses, including $1.3 million for data processing contract termination and system conversion costs, $1.2 million in legal and professional expenses, $0.4 million in severance payments and $0.3 million in other expenses. The following table presents unaudited pro forma financial information which combines the historical consolidated statements of income of S&T and Integrity to give effect to the Merger as if it had occurred on January 1, 2014, for the periods presented. Unaudited Pro Forma Information Three Months Ended June 30, Six Months Ended June 30, (dollars in thousands, except per share data) 2015 2014 2015 2014 Total revenue (1) $ 60,307 $ 57,921 $ 118,992 $ 115,045 Net income (2) $ 18,816 $ 17,765 $ 32,728 $ 33,697 Earnings per common share: (2) Basic $ 0.54 $ 0.51 $ 0.95 $ 0.97 Diluted $ 0.54 $ 0.51 $ 0.94 $ 0.97 (1) Total pro forma revenue is defined as net interest income plus non-interest income, excluding gains and losses on sales of investment securities available-for-sale. ( 2) Excludes merger expenses Pro forma adjustments include intangible amortization expense, net amortization or accretion of valuation amounts and income tax expense. The pro forma results are not indicative of the results of operations that would have occurred had the Merger taken place at the beginning of the periods presented nor are they intended to be indicative of results that may occur in the future.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2015
Earnings Per Share [Abstract]
Earnings Per Share	The following table reconciles the components 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, (in thousands, except shares and per share data) 2015 2014 2015 2014 Numerator for Earnings per Share—Basic: Net income $ 18,188 $ 14,720 $ 31,023 $ 28,753 Less: Income allocated to participating shares 79 29 123 64 Net Income Allocated to Shareholders $ 18,109 $ 14,691 $ 30,900 $ 28,689 Numerator for Earnings per Share—Diluted: Net income 18,188 14,720 $ 31,023 $ 28,753 Net Income Available to Shareholders $ 18,188 $ 14,720 $ 31,023 $ 28,753 Denominators for Earnings per Share: Weighted Average Shares Outstanding—Basic 34,652,895 29,684,300 32,951,936 29,672,611 Add: Potentially dilutive shares 28,283 16,894 36,359 27,559 Denominator for Treasury Stock Method—Diluted 34,681,178 29,701,194 32,988,295 29,700,170 Weighted Average Shares Outstanding—Basic 34,652,895 29,684,300 32,951,936 29,672,611 Add: Average participating shares outstanding 151,134 58,973 131,563 66,563 Denominator for Two-Class Method—Diluted 34,804,029 29,743,273 33,083,499 29,739,174 Earnings per share—basic $ 0.52 $ 0.49 $ 0.94 $ 0.97 Earnings per share—diluted $ 0.52 $ 0.49 $ 0.94 $ 0.97 Warrants considered anti-dilutive excluded from potentially dilutive shares - exercise price $31.53 per share, expires January 2019 517,012 517,012 517,012 517,012 Stock options considered anti-dilutive excluded from potentially dilutive shares 155,500 428,493 155,500 428,676 Restricted stock considered anti-dilutive excluded from potentially dilutive shares 122,851 42,079 95,204 39,005

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	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 marketable 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, interest rate lock commitments and the sale of mortgage loans in the secondary market. 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 counterparties' 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 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 carried at fair value 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 driving 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. 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 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 a discounted cash flow analysis that utilizes interest rates currently being offered for similar loans and adjusted for credit risk. The fair value of impaired 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 of bank owned life insurance. Federal Home Loan Bank, or FHLB, and Other Restricted Stock It is not practical to determine the fair value of our FHLB and other restricted stock due to the restrictions placed on the transferability of these stocks; therefore, it is presented at carrying 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 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 approximate 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, 2015 and December 31, 2014 . Due to limited trading volume, we transferred marketable equity securities with a fair value of $0.2 million from Level 1 to Level 2 during the six month period ended June 30, 2015. There were no other transfers between Level 1 and Level 2 for items measured at fair value on a recurring basis during the periods presented. June 30, 2015 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Securities available-for-sale: U.S. Treasury securities $ — $ 15,018 $ — $ 15,018 Obligations of U.S. government corporations and agencies — 270,112 — 270,112 Collateralized mortgage obligations of U.S. government corporations and agencies — 139,577 — 139,577 Residential mortgage-backed securities of U.S. government corporations and agencies — 43,419 — 43,419 Commercial mortgage-backed securities of U.S. government corporations and agencies — 49,676 — 49,676 Obligations of states and political subdivisions — 139,947 — 139,947 Marketable equity securities — 8,875 — 8,875 Total securities available-for-sale — 666,624 — 666,624 Trading securities held in a Rabbi Trust 3,796 — — 3,796 Total securities 3,796 666,624 — 670,420 Derivative financial assets: Interest rate swaps — 11,013 — 11,013 Interest rate lock commitments — 366 — 366 Forward sale contracts — 17 — 17 Total Assets $ 3,796 $ 678,020 $ — $ 681,816 LIABILITIES Derivative financial liabilities: Interest rate swaps $ — $ 10,994 $ — $ 10,994 Total Liabilities $ — $ 10,994 $ — $ 10,994 December 31, 2014 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Securities available-for-sale: U.S. Treasury securities $ — $ 14,880 $ — $ 14,880 Obligations of U.S. government corporations and agencies — 269,285 — 269,285 Collateralized mortgage obligations of U.S. government corporations and agencies — 118,006 — 118,006 Residential mortgage-backed securities of U.S. government corporations and agencies — 46,668 — 46,668 Commercial mortgage-backed securities of U.S. government corporations and agencies — 39,673 — 39,673 Obligations of states and political subdivisions — 142,702 — 142,702 Marketable equity securities 178 8,881 — 9,059 Total securities available-for-sale 178 640,095 — 640,273 Trading securities held in a Rabbi Trust 3,456 — — 3,456 Total securities 3,634 640,095 — 643,729 Derivative financial assets: Interest rate swaps — 12,981 — 12,981 Interest rate lock commitments — 235 — 235 Forward sale contracts — — — — Total Assets $ 3,634 $ 653,311 $ — $ 656,945 LIABILITIES Derivative financial liabilities: Interest rate swaps $ — $ 12,953 $ — $ 12,953 Forward sale contracts — 57 — 57 Total Liabilities $ — $ 13,010 $ — $ 13,010 We classify financial instruments as Level 3 when valuation models are used because significant inputs are not observable in the market. We had no assets or liabilities measured at fair value on a recurring basis for which we have utilized Level 3 inputs to determine the fair value at either June 30, 2015 or December 31, 2014. We may be required to measure certain assets and liabilities on a nonrecurring basis. Nonrecurring assets are recorded at the lower of cost or fair value in our financial statements. 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, 2015 and December 31, 2014 . There were no liabilities measured at fair value on a nonrecurring basis during these periods. June 30, 2015 December 31, 2014 (dollars in thousands) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total ASSETS (1) Loans held for sale $ — $ — $ 2,900 $ 2,900 $ — $ — $ — $ — Impaired loans — — 13,913 13,913 — — 12,916 12,916 Other real estate owned — — 747 747 — — 117 117 Mortgage servicing rights — — 721 721 — — 1,176 1,176 Total Assets $ — $ — $ 18,281 $ 18,281 $ — $ — $ 14,209 $ 14,209 (1) This table presents only the nonrecurring items that are recorded at fair value in our financial statements. The carrying values and fair values of our financial instruments at June 30, 2015 and December 31, 2014 are presented in the following tables: Carrying Value (1) Fair Value Measurements at June 30, 2015 (dollars in thousands) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 146,582 $ 146,582 $ 146,582 $ — $ — Securities available-for-sale 666,624 666,624 — 666,624 — Loans held for sale 13,634 13,722 — — 13,722 Portfolio loans, net of unearned income 4,798,498 4,774,871 — — 4,774,871 Bank owned life insurance 79,314 79,314 — 79,314 — FHLB and other restricted stock 23,553 23,553 — — 23,553 Trading securities held in a Rabbi Trust 3,796 3,796 3,796 — — Mortgage servicing rights 2,974 3,137 — — 3,137 Interest rate swaps 11,013 11,013 — 11,013 — Interest rate lock commitments 366 366 — 366 — Forward sale contracts 17 17 — 17 — LIABILITIES Deposits $ 4,859,415 $ 4,865,521 $ — $ — $ 4,865,521 Securities sold under repurchase agreements 46,235 46,235 — — 46,235 Short-term borrowings 230,975 230,975 — — 230,975 Long-term borrowings 118,228 119,148 — — 119,148 Junior subordinated debt securities 45,619 45,619 — — 45,619 Interest rate swaps 10,994 10,994 — 10,994 — (1) As reported in the Consolidated Balance Sheets Carrying Value (1) Fair Value Measurements at December 31, 2014 (dollars in thousands) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 109,580 $ 109,580 $ 109,580 $ — $ — Securities available-for-sale 640,273 640,273 178 640,095 — Loans held for sale 2,970 2,991 — — 2,991 Portfolio loans, net of unearned income 3,868,746 3,827,634 — — 3,827,634 Bank owned life insurance 62,252 62,252 — 62,252 — FHLB and other restricted stock 15,135 15,135 — — 15,135 Trading securities held in a Rabbi Trust 3,456 3,456 3,456 — — Mortgage servicing rights 2,817 2,934 — — 2,934 Interest rate swaps 12,981 12,981 — 12,981 — Interest rate lock commitments 235 235 — 235 — LIABILITIES Deposits $ 3,908,842 $ 3,910,342 $ — $ — $ 3,910,342 Securities sold under repurchase agreements 30,605 30,605 — — 30,605 Short-term borrowings 290,000 290,000 — — 290,000 Long-term borrowings 19,442 20,462 — — 20,462 Junior subordinated debt securities 45,619 45,619 — — 45,619 Interest rate swaps 12,953 12,953 — 12,953 — Forward sale contracts 57 57 — 57 — (1) As reported in the Consolidated Balance Sheets

Securities Available-for-Sale

Securities Available-for-Sale	6 Months Ended
	Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Securities Available-for-Sale	The following tables present the amortized cost and fair value of available-for-sale securities as of the dates presented: June 30, 2015 December 31, 2014 (dollars in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Treasury securities $ 14,893 $ 125 $ — $ 15,018 $ 14,873 $ 7 $ — $ 14,880 Obligations of U.S. government corporations and agencies 267,604 2,935 (427 ) 270,112 268,029 2,334 (1,078 ) 269,285 Collateralized mortgage obligations of U.S. government corporations and agencies 138,160 1,549 (132 ) 139,577 116,897 1,257 (148 ) 118,006 Residential mortgage-backed securities of U.S. government corporations and agencies 42,155 1,450 (186 ) 43,419 45,274 1,548 (154 ) 46,668 Commercial mortgage-backed securities of U.S. government corporations and agencies 49,737 312 (373 ) 49,676 39,834 232 (393 ) 39,673 Obligations of states and political subdivisions 136,540 3,927 (520 ) 139,947 136,977 5,789 (64 ) 142,702 Debt Securities 649,089 10,298 (1,638 ) 657,749 621,884 11,167 (1,837 ) 631,214 Marketable equity securities 7,579 1,296 — 8,875 7,579 1,480 — 9,059 Total $ 656,668 $ 11,594 $ (1,638 ) $ 666,624 $ 629,463 $ 12,647 $ (1,837 ) $ 640,273 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) 2015 2014 2015 2014 Gross realized gains $ — $ 40 $ — $ 41 Gross realized losses 34 — 34 — Net Realized Gains $ (34 ) $ 40 $ (34 ) $ 41 The following tables present the fair value and the age of gross unrealized losses by investment category as of the dates presented: June 30, 2015 Less Than 12 Months 12 Months or More Total (dollars in thousands) Number of Securities Fair Value Unrealized Number of Securities Fair Value Unrealized Number of Securities Fair Value Unrealized Obligations of U.S. government corporations and agencies 4 $ 33,489 $ (215 ) 4 $ 30,033 $ (212 ) 8 $ 63,522 $ (427 ) Collateralized mortgage obligations of U.S. government corporations and agencies 2 17,288 (132 ) — — — 2 17,288 (132 ) Residential mortgage-backed securities of U.S. government corporations and agencies 2 10,704 (186 ) — — — 2 10,704 (186 ) Commercial mortgage-backed securities of U.S. government corporations and agencies 2 20,976 (180 ) 1 9,610 (193 ) 3 30,586 (373 ) Obligations of states and political subdivisions 10 42,967 (520 ) — — — 10 42,967 (520 ) Total Temporarily Impaired Securities 20 $ 125,424 $ (1,233 ) 5 $ 39,643 $ (405 ) 25 $ 165,067 $ (1,638 ) December 31, 2014 Less Than 12 Months 12 Months or More Total (dollars in thousands) Number of Securities Fair Value Unrealized Losses Number of Securities Fair Value Unrealized Losses Number of Securities Fair Value Unrealized Losses Obligations of U.S. government corporations and agencies 4 $ 39,745 $ (207 ) 8 $ 63,149 $ (871 ) 12 $ 102,894 $ (1,078 ) Collateralized mortgage obligations of U.S. government corporations and agencies 1 9,323 (148 ) — — — 1 9,323 (148 ) Residential mortgage-backed securities of U.S. government corporations and agencies — — — 1 8,982 (154 ) 1 8,982 (154 ) Commercial mortgage-backed securities of U.S. government corporations and agencies 1 9,998 (25 ) 2 20,640 (368 ) 3 30,638 (393 ) Obligations of states and political subdivisions 1 263 (1 ) 2 10,756 (63 ) 3 11,019 (64 ) Total Temporarily Impaired Securities 7 $ 59,329 $ (381 ) 13 $ 103,527 $ (1,456 ) 20 $ 162,856 $ (1,837 ) We do not believe any individual unrealized loss as of June 30, 2015 represents an other than temporary impairment. As of June 30, 2015 , the unrealized losses on 25 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, 2015 . 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 (loss)/income for the periods presented: June 30, 2015 December 31, 2014 (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 $ 11,594 $ (1,638 ) $ 9,956 $ 12,647 $ (1,837 ) $ 10,810 Income tax expense/(benefit) 4,058 (573 ) 3,485 4,426 (643 ) 3,783 Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss) $ 7,536 $ (1,065 ) $ 6,471 $ 8,221 $ (1,194 ) $ 7,027 The amortized cost and fair value of securities available-for-sale at June 30, 2015 by contractual maturity are included in the table below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. June 30, 2015 (dollars in thousands) Amortized Cost Fair Value Obligations of the U.S. Treasury, U.S. government corporations and agencies, and obligations of states and political subdivisions Due in one year or less $ 29,892 $ 30,223 Due after one year through five years 215,038 217,163 Due after five years through ten years 80,796 82,406 Due after ten years 93,311 95,285 419,037 425,077 Collateralized mortgage obligations of U.S. government corporations and agencies 138,160 139,577 Residential mortgage-backed securities of U.S. government corporations and agencies 42,155 43,419 Commercial mortgage-backed securities of U.S. government corporations and agencies 49,737 49,676 Debt Securities 649,089 657,749 Marketable equity securities 7,579 8,875 Total $ 656,668 $ 666,624 At June 30, 2015 and December 31, 2014 , securities with carrying values of $326.3 million and $289.1 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, 2015
Receivables [Abstract]
Loans and Loans Held for Sale	Loans are presented net of unearned income of $14.0 million and $2.1 million at June 30, 2015 and December 31, 2014 . Included in the $14.0 million is a $14.7 million net discount related to purchase accounting fair value adjustments. The following table indicates the composition of the loans as of the dates presented: (dollars in thousands) June 30, 2015 December 31, 2014 Commercial Commercial real estate $ 2,054,935 $ 1,682,236 Commercial and industrial 1,239,382 994,138 Commercial construction 344,983 216,148 Total Commercial Loans 3,639,300 2,892,522 Consumer Residential mortgage 599,502 489,586 Home equity 457,813 418,563 Installment and other consumer 94,437 65,567 Consumer construction 7,446 2,508 Total Consumer Loans 1,159,198 976,224 Total Portfolio Loans 4,798,498 3,868,746 Loans held for sale 13,634 2,970 Total Loans $ 4,812,132 $ 3,871,716 We attempt to limit our exposure to credit risk by diversifying our loan portfolio by segment, collateral and industry 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 76 percent of total portfolio loans at June 30, 2015 and 75 percent of total portfolio loans at December 31, 2014 . Within our commercial portfolio, the CRE and commercial construction portfolios combined comprised $2.4 billion or 66 percent of total commercial loans and 50 percent of total portfolio loans at June 30, 2015 and 66 percent of total commercial loans and 49 percent of total portfolio loans at December 31, 2014 . Of the $2.4 billion of CRE and commercial construction loans, $424.0 million were added as a result of the Merger. Further segmentation of the CRE and commercial construction portfolios by industry and collateral type reveal no concentration in excess of 7.0 percent of total loans at June 30, 2015 and December 31, 2014 . Our market area includes Pennsylvania and the contiguous states of Ohio, West Virginia, New York and Maryland. The majority of our commercial and consumer loans are made to businesses and individuals in this market area resulting in a geographic concentration. We believe our knowledge and familiarity with customers and conditions locally outweighs this geographic concentration risk. 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. Our CRE and commercial construction portfolios had out of market exposure of 6.3 percent of the combined portfolio and 3.1 percent of total loans at June 30, 2015 and 8.0 percent of the combined portfolio and 3.9 percent of total loans at December 31, 2014 . 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, 2015 December 31, 2014 (dollars in thousands) Performing TDRs Nonperforming TDRs Total TDRs Performing TDRs Nonperforming TDRs Total TDRs Commercial real estate $ 13,045 $ 3,553 $ 16,598 $ 16,939 $ 2,180 $ 19,119 Commercial and industrial 7,899 2,226 10,125 8,074 356 8,430 Commercial construction 5,655 1,969 7,624 5,736 1,869 7,605 Residential mortgage 2,622 609 3,231 2,839 459 3,298 Home equity 3,302 411 3,713 3,342 562 3,904 Installment and other consumer 36 160 196 53 10 63 Total $ 32,559 $ 8,928 $ 41,487 $ 36,983 $ 5,436 $ 42,419 There were six TDRs that returned to accruing status totaling $0.3 million during the three and six months ended June 30, 2015 and there were no TDRs that returned to accruing status for the three and six months ended June 30, 2014. The following tables present the restructured loans during the periods presented: Three Months Ended June 30, 2015 Three Months Ended June 30, 2014 (dollars in thousands) Number of Loans Pre-Modification Outstanding Recorded Investment ( 1) Post-Modification Outstanding Recorded Investment (1) Total Difference in Recorded Investment Number of Loans Pre-Modification Outstanding Recorded Investment (1) Post-Modification Outstanding Recorded Investment (1) Total Difference in Recorded Investment Commercial real estate Principal deferral — $ — $ — $ — 1 $ 129 $ 127 $ (2 ) Commercial and industrial Principal forgiveness 1 400 400 — — — — — Residential mortgage Chapter 7 bankruptcy (2) — — — — 1 52 52 — Maturity date extension and interest rate reduction 2 225 225 — — — — — Home equity Chapter 7 bankruptcy (2) 4 171 171 — 4 43 41 (2 ) Installment and other consumer Chapter 7 bankruptcy (2) — — — $ — 1 9 9 $ — Total by Concession Type Principal forgiveness 1 $ 400 $ 400 $ — — $ — $ — $ — Principal deferral — — — — 1 129 127 (2 ) Maturity date extension and interest rate reduction 2 225 225 — — — — — Chapter 7 bankruptcy (2) 4 171 171 — 6 104 102 (2 ) Total 7 $ 796 $ 796 $ — 7 $ 233 $ 229 $ (4 ) (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. Six Months Ended June 30, 2015 Six Months Ended June 30, 2014 (dollars in thousands) Number of Pre-Modification (1) Post-Modification (1) Total Difference Number of Pre-Modification ( 1) Post-Modification (1) Total Difference Commercial real estate Principal deferral 2 $ 2,851 $ 2,851 $ — 1 $ 129 $ 127 $ (2 ) Commercial and industrial Principal forgiveness 1 400 400 — — — — — Principal deferral 6 661 661 — — — — — Chapter 7 bankruptcy (2) 1 3 1 (2 ) 1 287 286 (1 ) Maturity date extension 1 780 765 (15 ) — — — — Commercial Construction Principal deferral 1 104 103 (1 ) — — — — Maturity date extension — — — — 1 1,019 1,019 — Residential mortgage Chapter 7 bankruptcy (2) — — — — 5 329 327 (2 ) Maturity date extension and interest rate reduction 2 225 225 — — — — — Home equity Chapter 7 bankruptcy (2) 12 313 304 (9 ) 10 269 251 (18 ) Maturity date extension 1 71 71 — — — — — Installment and other consumer Chapter 7 bankruptcy (2) — — — $ — 1 9 9 $ — Total by Concession Type Principal forgiveness 1 $ 400 $ 400 $ — — $ — $ — $ — Principal deferral 9 3,616 3,615 (1 ) 1 129 127 (2 ) Chapter 7 bankruptcy (2) 13 316 305 (11 ) 17 894 873 (21 ) Maturity date extension and interest rate reduction 2 225 225 — — — — — Maturity date extension 2 851 836 (15 ) 1 1,019 1,019 — Total 27 5,408 5,381 $ (27 ) 19 $ 2,042 $ 2,019 $ (23 ) (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. For the three months ended June 30, 2015 , we modified four C&I loans totaling $5.5 million , four commercial construction loans totaling $1.3 million , one CRE loan totaling $0.8 million and two home equity loans totaling $0.2 million that were not considered to be TDRs. For the six months ended June 30, 2015 we modified six C&I loans totaling $5.7 million , four commercial construction loans totaling $1.3 million , three CRE loans totaling $1.0 million and two home equity loans totaling $0.2 million that were not considered to be TDRs. The modifications represented instances where there were insignificant delays in payment of three months or less or we concluded that no concession was granted. As of June 30, 2015 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 12 months prior to defaulting: Defaulted TDRs Three Months Ended Three Months Ended June 30, 2015 June 30, 2014 (dollars in thousands) Number of Defaults Recorded Investment Number of Defaults Recorded Investment Home equity 2 $ 119 — $ — Total 2 $ 119 — $ — Defaulted TDRs Six Months Ended Six Months Ended June 30, 2015 June 30, 2014 (dollars in thousands) Number of Defaults Recorded Investment Number of Defaults Recorded Investment Residential mortgage 1 $ 183 1 $ 72 Home equity 3 124 — — Total 4 $ 307 1 $ 72 The following table is a summary of nonperforming assets as of the dates presented: Nonperforming Assets (dollars in thousands) June 30, 2015 December 31, 2014 Nonperforming Assets Nonaccrual loans $ 10,211 $ 7,021 Nonaccrual TDRs 8,928 5,436 Total nonaccrual loans 19,139 12,457 OREO 750 166 Total Nonperforming Assets $ 19,889 $ 12,623

Allowance for Loan Losses

Allowance for Loan Losses	6 Months Ended
	Jun. 30, 2015
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, or LTV, 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. The ALL methodology for groups of loans collectively evaluated for impairment is comprised of both a quantitative and qualitative analysis. A key assumption in the quantitative component of the reserve is the loss emergence period, or LEP. The LEP is an estimate of the average amount of time from the point at which a loss is incurred on a loan to the point at which the loss is confirmed. In general, the LEP will be shorter in an economic slowdown or recession and longer during times of economic stability or growth, as customers are better able to delay loss confirmation after a potential loss event has occurred. Another key assumption is the look-back period, or LBP, which represents the historical data period utilized to calculate loss rates. 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, 2015 and December 31, 2014 : June 30, 2015 (dollars in thousands) Current 30-59 Days Past Due 60-89 Days Past Due 90 Days Past Due (1) Nonaccrual Total Past Due Total Loans Commercial real estate $ 2,032,731 $ 9,656 $ 3,518 $ 1,721 $ 7,309 $ 22,204 $ 2,054,935 Commercial and industrial 1,231,221 2,875 2,143 — 3,143 8,161 1,239,382 Commercial construction 333,897 4,474 — 2,140 4,472 11,086 344,983 Residential mortgage 593,043 1,732 1,770 947 2,010 6,459 599,502 Home equity 453,279 1,971 430 107 2,026 4,534 457,813 Installment and other consumer 93,223 261 774 — 179 1,214 94,437 Consumer construction 7,446 — — — — — 7,446 Loans held for sale 13,634 — — — — — 13,634 Totals $ 4,758,474 $ 20,969 $ 8,635 $ 4,915 $ 19,139 $ 53,658 $ 4,812,132 (1) Represents acquired loans that were recorded at fair value at the acquisition date. December 31, 2014 (dollars in thousands) Current 30-59 Days Past Due 60-89 Days Past Due 90 Days Past Due Nonaccrual Total Past Due Total Loans Commercial real estate $ 1,674,930 $ 2,548 $ 323 $ — $ 4,435 $ 7,306 $ 1,682,236 Commercial and industrial 991,136 1,227 153 — 1,622 3,002 994,138 Commercial construction 214,174 — — — 1,974 1,974 216,148 Residential mortgage 485,465 565 1,220 — 2,336 4,121 489,586 Home equity 414,303 1,756 445 — 2,059 4,260 418,563 Installment and other consumer 65,111 352 73 — 31 456 65,567 Consumer construction 2,508 — — — — — 2,508 Loans held for sale 2,970 — — — — — 2,970 Totals $ 3,850,597 $ 6,448 $ 2,214 $ — $ 12,457 $ 21,119 $ 3,871,716 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 present the recorded investment in commercial loan classes by internally assigned risk ratings as of the dates presented: June 30, 2015 (dollars in thousands) Commercial Real Estate % of Total Commercial and Industrial % of Total Commercial Construction % of Total Total % of Total Pass $ 1,976,311 96.2 % $ 1,158,898 93.5 % $ 300,968 87.3 % $ 3,436,177 94.4 % Special mention 33,328 1.6 % 60,251 4.9 % 26,276 7.6 % 119,855 3.3 % Substandard 45,296 2.2 % 20,233 1.6 % 17,739 5.1 % 83,268 2.3 % Total $ 2,054,935 100 % $ 1,239,382 100.0 % $ 344,983 100.0 % $ 3,639,300 100.0 % December 31, 2014 (dollars in thousands) Commercial Real Estate % of Total Commercial and Industrial % of Total Commercial Construction % of Total Total % of Total Pass $ 1,635,132 97.2 % $ 948,663 95.4 % $ 196,520 90.9 % $ 2,780,315 96.1 % Special mention 23,597 1.4 % 30,357 3.1 % 12,014 5.6 % 65,968 2.3 % Substandard 23,507 1.4 % 15,118 1.5 % 7,614 3.5 % 46,239 1.6 % Total $ 1,682,236 100.0 % $ 994,138 100.0 % $ 216,148 100.0 % $ 2,892,522 100.0 % 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 present the recorded investment in consumer loan classes by performing and nonperforming status as of the dates presented: June 30, 2015 (dollars in thousands) Residential Mortgage % of Total Home Equity % of Total Installment and other consumer % of Total Consumer Construction % of Total Total % of Total Performing $ 597,492 99.7 % $ 455,787 99.6 % $ 94,258 99.8 % $ 7,446 100.0 % $ 1,154,983 99.6 % Nonperforming 2,010 0.3 % 2,026 0.4 % 179 0.2 % — — % 4,215 0.4 % Total $ 599,502 100.0 % $ 457,813 100.0 % $ 94,437 100.0 % $ 7,446 100.0 % $ 1,159,198 100.0 % December 31, 2014 (dollars in thousands) Residential Mortgage % of Total Home Equity % of Total Installment and other consumer % of Total Consumer Construction % of Total Total % of Total Performing $ 487,250 99.5 % $ 416,504 99.5 % $ 65,536 99.9 % $ 2,508 100.0 % $ 971,798 99.5 % Nonperforming 2,336 0.5 % 2,059 0.5 % 31 0.1 % — — % 4,426 0.5 % Total $ 489,586 100.0 % $ 418,563 100.0 % $ 65,567 100.0 % $ 2,508 100.0 % $ 976,224 100.0 % 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 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 tables summarize investments in loans considered to be impaired and the related information on those impaired loans as of the dates presented: June 30, 2015 December 31, 2014 (dollars in thousands) Recorded Investment Unpaid Principal Balance Related Allowance Recorded Investment Unpaid Principal Balance Related Allowance Without a related allowance recorded: Commercial real estate $ 18,548 $ 25,698 $ — $ 19,890 $ 25,262 $ — Commercial and industrial 10,125 11,877 — 9,218 9,449 — Commercial construction 9,293 12,983 — 7,605 11,293 — Consumer real estate 6,824 7,527 — 7,159 7,733 — Other consumer 192 197 — 42 48 — Total without a Related Allowance Recorded 44,982 58,282 — 43,914 53,785 — With a related allowance recorded: Commercial real estate 749 749 567 — — — Commercial and industrial — — — — — — Commercial construction — — — — — — Consumer real estate 120 120 37 43 43 43 Other consumer 4 4 4 20 20 11 Total with a Related Allowance Recorded 873 873 608 63 63 54 Total: Commercial real estate 19,297 26,447 567 19,890 25,262 — Commercial and industrial 10,125 11,877 — 9,218 9,449 — Commercial construction 9,293 12,983 — 7,605 11,293 — Consumer real estate 6,944 7,647 37 7,202 7,776 43 Other consumer 196 201 4 62 68 11 Total $ 45,855 $ 59,155 $ 608 $ 43,977 $ 53,848 $ 54 The following tables summarize investments in loans considered to be impaired and related information on those impaired loans for the periods presented: Three Months Ended June 30, 2015 June 30, 2014 (dollars in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Without a related allowance recorded: Commercial real estate $ 19,733 $ 158 $ 21,382 $ 159 Commercial and industrial 10,782 84 9,317 57 Commercial construction 8,119 81 8,279 57 Consumer real estate 6,891 91 7,166 100 Other consumer 126 4 109 1 Total without a Related Allowance Recorded 45,651 418 46,253 374 With a related allowance recorded: Commercial real estate 420 — — — Commercial and industrial — — — — Commercial construction — — — — Consumer real estate 121 2 48 1 Other consumer 4 — 22 — Total with a Related Allowance Recorded 545 2 70 1 Total: Commercial real estate 20,153 158 21,382 159 Commercial and industrial 10,782 84 9,317 57 Commercial construction 8,119 81 8,279 57 Consumer real estate 7,012 93 7,214 101 Other consumer 130 4 131 1 Total $ 46,196 $ 420 $ 46,323 $ 375 Six Months Ended June 30, 2015 June 30, 2014 (dollars in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Without a related allowance recorded: Commercial real estate $ 20,455 $ 322 $ 21,980 $ 329 Commercial and industrial 11,162 146 9,066 114 Commercial construction 6,628 134 8,301 114 Consumer real estate 6,943 186 7,260 203 Other consumer 86 4 112 2 Total without a Related Allowance Recorded 45,274 792 46,719 762 With a related allowance recorded: Commercial real estate $ 211 $ — $ — $ — Commercial and industrial — — — — Commercial construction — — — — Consumer real estate 122 3 50 2 Other consumer 4 — 23 1 Total with a Related Allowance Recorded 337 3 73 3 Total: Commercial real estate 20,666 322 21,980 329 Commercial and industrial 11,162 146 9,066 114 Commercial construction 6,628 134 8,301 114 Consumer real estate 7,065 189 7,310 205 Other consumer 90 4 135 3 Total $ 45,611 $ 795 $ 46,792 $ 765 The following tables detail activity in the ALL for the periods presented: Three Months Ended June 30, 2015 (dollars in thousands) Commercial Real Estate Commercial and Industrial Commercial Construction Consumer Real Estate Other Consumer Total Loans Balance at beginning of period $ 19,071 $ 13,711 $ 6,869 $ 6,723 $ 1,732 $ 48,106 Charge-offs (310 ) (992 ) — (177 ) (276 ) (1,755 ) Recoveries 73 89 1 112 129 404 Net (Charge-offs)/ Recoveries (237 ) (903 ) 1 (65 ) (147 ) (1,351 ) Provision for loan losses 184 500 801 369 205 2,059 Balance at End of Period $ 19,018 $ 13,308 $ 7,671 $ 7,027 $ 1,790 $ 48,814 Three Months Ended June 30, 2014 (dollars in thousands) Commercial Real Estate Commercial and Industrial Commercial Construction Consumer Real Estate Other Consumer Total 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 (Charge-offs)/ Recoveries (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 Six Months Ended June 30, 2015 (dollars in thousands) Commercial Real Estate Commercial and Industrial Commercial Construction Consumer Real Estate Other Consumer Total Loans Balance at beginning of period $ 20,164 $ 13,668 $ 6,093 $ 6,333 $ 1,653 $ 47,911 Charge-offs (376 ) (1,698 ) — (552 ) (579 ) (3,205 ) Recoveries 176 203 2 248 213 842 Net (Charge-offs)/Recoveries (200 ) (1,495 ) 2 (304 ) (366 ) (2,363 ) Provision for loan losses (946 ) 1,135 1,576 998 503 3,266 Balance at End of Period $ 19,018 $ 13,308 $ 7,671 $ 7,027 $ 1,790 $ 48,814 Six Months Ended June 30, 2014 (dollars in thousands) Commercial Real Estate Commercial and Industrial Commercial Construction Consumer Real Estate Other Consumer Total 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 (Charge-offs)/Recoveries (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 The following tables present the ALL and recorded investments in loans by category as of the periods presented: June 30, 2015 Allowance for Loan Losses Portfolio Loans (dollars in thousands) Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Individually Evaluated for Impairment Collectively Evaluated for Impairment Total (1) Commercial real estate $ 567 $ 18,451 $ 19,018 $ 19,297 $ 2,035,638 $ 2,054,935 Commercial and industrial — 13,308 13,308 10,125 1,229,257 1,239,382 Commercial construction — 7,671 7,671 9,293 335,690 344,983 Consumer real estate 37 6,990 7,027 6,944 1,057,817 1,064,761 Other consumer 4 1,786 1,790 196 94,241 94,437 Total $ 608 $ 48,206 $ 48,814 $ 45,855 $ 4,752,643 $ 4,798,498 (1) Includes acquired loans. December 31, 2014 Allowance for Loan Losses Portfolio Loans (dollars in thousands) Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Individually Evaluated for Impairment Collectively Evaluated for Impairment Total (1) Commercial real estate $ — $ 20,164 $ 20,164 $ 19,890 $ 1,662,346 $ 1,682,236 Commercial and industrial — 13,668 13,668 9,218 984,920 994,138 Commercial construction — 6,093 6,093 7,605 208,543 216,148 Consumer real estate 43 6,290 6,333 7,202 903,455 910,657 Other consumer 11 1,642 1,653 62 65,505 65,567 Total $ 54 $ 47,857 $ 47,911 $ 43,977 $ 3,824,769 $ 3,868,746 (1) Includes acquired loans. Acquired loans are recorded at fair value with no carryover of the ALL. Credit deterioration on acquired loans incurred subsequent to the acquisition date will be recognized in the ALL through the provision.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	6 Months Ended
	Jun. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities	Interest Rate Swaps In accordance with applicable accounting guidance for derivatives and hedging, all derivatives are recognized as either assets or liabilities on the balance sheet at fair value. 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, including 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 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 estimated 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 may encounter pricing risks 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 estimated 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 (included in Other Assets) Derivatives (included in Other Liabilities) (dollars in thousands) June 30, 2015 December 31, 2014 June 30, 2015 December 31, 2014 Derivatives not Designated as Hedging Instruments: Interest Rate Swap Contracts- Commercial Loans Fair value $ 11,013 $ 12,981 $ 10,994 $ 12,953 Notional amount 233,777 245,152 233,777 245,152 Collateral posted — — 12,489 12,059 Interest Rate Lock Commitments- Mortgage Loans Fair value 366 235 — — Notional amount 14,034 8,822 — — Forward Sale Contracts- Mortgage Loans Fair value 17 — — 57 Notional amount $ 13,812 $ — $ — $ 7,789 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 (included in Other Assets) Derivatives (included in Other Liabilities) (dollars in thousands) June 30, 2015 December 31, 2014 June 30, 2015 December 31, 2014 Derivatives not Designated as Hedging Instruments: Gross amounts recognized $ 11,030 $ 13,203 $ 11,011 $ 13,175 Gross amounts offset (17 ) (222 ) (17 ) (222 ) Net amounts presented in the Consolidated Balance Sheets 11,013 12,981 10,994 12,953 Gross amounts not offset (1) — — (12,489 ) (12,059 ) Net Amount $ 11,013 $ 12,981 $ (1,495 ) $ 894 (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) 2015 2014 2015 2014 Derivatives not Designated as Hedging Instruments Interest rate swap contracts—commercial loans $ (21 ) $ (11 ) $ (8 ) $ (19 ) Interest rate lock commitments—mortgage loans (8 ) 199 128 207 Forward sale contracts—mortgage loans 92 (64 ) 74 (93 ) Total Derivatives Gain (Loss) $ 63 $ 124 $ 194 $ 95

Borrowings

Borrowings	6 Months Ended
	Jun. 30, 2015
Debt Disclosure [Abstract]
Borrowings	Short-term borrowings are for terms under one year and were comprised of retail repurchase agreements, or REPOs, and FHLB advances. FHLB advances are for various terms and are secured by a blanket lien on residential mortgages and other real estate secured loans. All REPOs are overnight short-term investments and are not insured by the Federal Deposit Insurance Corporation, or FDIC. 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. Mortgage backed securities with a total carrying value of $50.5 million at June 30, 2015 and $35.6 million at December 31, 2014 were pledged as collateral for these secured transactions. The pledged securities are held in safekeeping at the Federal Reserve. Due to the overnight short-term nature of REPOs, potential risk due to a decline in the value of the pledged collateral is low. Collateral pledging requirements with REPOs are monitored daily. 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 are secured by the same loans as short-term borrowings. We had total long-term borrowings outstanding of $15.0 million at a fixed rate and $148.8 million at a variable rate at June 30, 2015 , excluding our capital lease of $0.2 million . On March 5, 2015, we paid off $8.5 million and on June 18, 2015, we paid off the remaining $5.0 million of the $13.5 million junior subordinated debt assumed in the Merger. Information pertaining to borrowings is summarized in the table below as of the dates presented: June 30, 2015 December 31, 2014 (dollars in thousands) Balance Weighted Average Rate Balance Weighted Average Rate Short-term borrowings Securities sold under repurchase agreements $ 46,235 0.01 % $ 30,605 0.01 % Short-term borrowings 230,975 0.33 % 290,000 0.31 % Total short-term borrowings 277,210 0.28 % 320,605 0.27 % Long-term borrowings Other long-term borrowings 118,228 0.76 % 19,442 3.00 % Junior subordinated debt securities 45,619 2.74 % 45,619 2.70 % Total long-term borrowings 163,847 1.31 % 65,061 2.79 % Total Borrowings $ 441,057 0.66 % $ 385,666 0.70 % We had total borrowings at June 30, 2015 and December 31, 2014 at the FHLB of Pittsburgh of $349.0 million and $309.3 million . The $349.0 million at June 30, 2015 consisted of $231.0 million in short-term borrowings and $118.0 million in long-term borrowings. Our maximum borrowing capacity with the FHLB of Pittsburgh was $1.9 billion at June 30, 2015 . Our remaining borrowing availability is $1.4 billion . We utilized $0.5 billion of our borrowing capacity at June 30, 2015 consisting of $349.0 million for borrowings and $168.5 million for letters of credit to collateralize public funds.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
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 the 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. Because 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 $2.9 million at June 30, 2015 and $2.3 million at December 31, 2014 . The allowance for unfunded commitments is included in other liabilities in the Consolidated Balance Sheets. The allowance for unfunded commitments is determined using a similar methodology as our ALL. The reserve is calculated by applying historical loss rates and qualitative adjustments to our unfunded commitments. 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, 2015 December 31, 2014 Commitments to extend credit $ 1,453,491 $ 1,158,628 Standby letters of credit 98,838 73,584 Total $ 1,552,329 $ 1,232,212 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 pending will not have a material adverse effect on our consolidated financial position or results of operations.

Other Comprehensive Income

Other Comprehensive Income	6 Months Ended
	Jun. 30, 2015
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, 2015 Three Months Ended June 30, 2014 (dollars in thousands) Pre-Tax Amount Tax (Expense) Benefit Net of Tax Amount Pre-Tax Amount Tax (Expense) Benefit Net of Tax Amount Change in unrealized (losses)/gains on securities available-for-sale $ (5,872 ) $ 2,056 $ (3,816 ) $ 5,401 $ (1,891 ) $ 3,510 Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income (1) 34 (12 ) 22 (40 ) 15 (25 ) Adjustment to funded status of employee benefit plans 463 (162 ) 301 211 (74 ) 137 Other Comprehensive (Loss)/Income $ (5,375 ) $ 1,882 $ (3,493 ) $ 5,572 $ (1,950 ) $ 3,622 (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/losses-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, 2015 Six Months Ended June 30, 2014 (dollars in thousands) Pre-Tax Amount Tax (Expense) Benefit Net of Tax Amount Pre-Tax Amount Tax (Expense) Benefit Net of Tax Amount Change in unrealized (losses)/ gains on securities available-for-sale $ (889 ) $ 311 $ (578 ) $ 9,876 $ (3,457 ) $ 6,419 Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income (1) 34 (12 ) 22 (41 ) 15 (26 ) Adjustment to funded status of employee benefit plans 1,192 (324 ) 868 423 (148 ) 275 Other Comprehensive Income $ 337 $ (25 ) $ 312 $ 10,258 $ (3,590 ) $ 6,668 (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/losses-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, 2015
Compensation and Retirement Disclosure [Abstract]
Employee Benefits	We maintain a defined benefit pension plan, or Plan, covering 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 2015. The expected long-term rate of return on plan assets is 8.00 percent . Effective January 1, 2015, the Plan was amended to provide unmarried participants with the ability to name a beneficiary to receive a lump sum death benefit equal to 80% of the participant’s accrued benefit payable at normal retirement age, in the event the participant dies while employed by S&T. 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) 2015 2014 2015 2014 Components of Net Periodic Pension Cost Service cost—benefits earned during the period $ 672 $ 631 $ 1,344 $ 1,262 Interest cost on projected benefit obligation 1,100 1,106 2,200 2,212 Expected return on plan assets (1,807 ) (1,735 ) (3,614 ) (3,470 ) Amortization of prior service (credit) cost (35 ) (35 ) (70 ) (70 ) Recognized net actuarial loss 468 209 936 418 Net Periodic Pension Expense $ 398 $ 176 $ 796 $ 352

Segments

Segments	6 Months Ended
	Jun. 30, 2015
Segment Reporting [Abstract]
Segments	We operate three reportable operating segments: Community Banking, Insurance and Wealth Management. • Our Community Banking segment offers services which include accepting time and demand deposits, 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 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 institutional accounts. The following table represents total assets by reportable operating segment as of the dates presented: (dollars in thousands) June 30, 2015 December 31, 2014 Community Banking $ 6,121,771 $ 4,954,728 Insurance 8,232 7,468 Wealth Management 3,725 2,490 Total Assets $ 6,133,728 $ 4,964,686 The following tables provide financial information for our three operating segments for the three and six month periods ended June 30, 2015 and 2014 . The financial results of the business segments include allocations for shared services based on an internal analysis that supports line of business and branch performance measurement. Shared services include expenses such as employee benefits, occupancy expense, computer support and other corporate overhead. Even with these allocations, the financial results are not necessarily indicative of the business segments’ financial condition and results of operations as 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, 2015 (dollars in thousands) Community Banking Insurance Wealth Management Eliminations Consolidated Interest income $ 52,598 $ 1 $ 157 $ (145 ) $ 52,611 Interest expense 4,056 — — (256 ) 3,800 Net interest income 48,542 1 157 111 48,811 Provision for loan losses 2,059 — — — 2,059 Noninterest income 8,869 1,328 2,917 269 13,383 Noninterest expense 29,916 1,053 2,285 380 33,634 Depreciation expense 1,279 14 6 — 1,299 Amortization of intangible assets 495 13 8 — 516 Provision for income taxes 6,139 88 271 — 6,498 Net Income $ 17,523 $ 161 $ 504 $ — $ 18,188 Three Months Ended June 30, 2014 (dollars in thousands) Community Banking Insurance Wealth Management Eliminations Consolidated 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 Six Months Ended June 30, 2015 (dollars in thousands) Community Banking Insurance Wealth Management Eliminations Consolidated Interest income $ 96,483 $ 1 $ 298 $ (256 ) $ 96,526 Interest expense 7,944 — — (488 ) 7,456 Net interest income 88,539 1 298 232 89,070 Provision for loan losses 3,266 — — — 3,266 Noninterest income 16,406 2,881 5,833 347 25,467 Noninterest expense 58,603 2,190 4,505 579 65,877 Depreciation expense 2,290 26 13 — 2,329 Amortization of intangible assets 822 25 17 — 864 Provision for income taxes 10,396 224 558 — 11,178 Net Income $ 29,568 $ 417 $ 1,038 $ — $ 31,023 Six Months Ended June 30, 2014 (dollars in thousands) Community Banking Insurance Wealth Management Eliminations Consolidated 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

Qualified Affordable Housing Pr

Qualified Affordable Housing Projects	6 Months Ended
	Jun. 30, 2015
Investments in Affordable Housing Projects [Abstract]
Qualified Affordable Housing Projects	We invest in affordable housing projects primarily to satisfy our Community Reinvestment Act requirements. As a limited partner in these operating partnerships, we receive tax credits and tax deductions for losses incurred by the underlying properties. We use the cost method to account for these partnerships. Our total investment in qualified affordable housing projects totaled $16.8 million at June 30, 2015 and $18.6 million at December 31, 2014. We had no open commitments to fund current or future investments in qualified affordable housing projects at June 30, 2015 or December 31, 2014. Amortization expense included in noninterest expense was $0.9 million and $1.9 million for the three and six months ended June 30, 2015 and $1.0 million and $2.0 million for the three and six months ended June 30, 2014. The amortization expense was offset by tax credits of $1.0 million and $2.0 million for the three and six months ended June 30, 2015 and $1.1 million and $2.2 million for the three and six months ended June 30, 2014 as a reduction to our federal tax provision.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2015
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, 2014 , filed with the Securities and Exchange Commission, or SEC, on February 20, 2015. 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.
Recently Adopted Accounting Standards and Recently Issued Accounting Updates not yet Adopted	Recently Adopted Accounting Standards Updates, or ASU Repurchase-To-Maturity Transactions, Repurchase Financings, and Disclosures In June 2014, the Financial Accounting Standards Board, or FASB, issued ASU No. 2014-11, Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures which introduces two accounting changes to the Transfers and Servicing guidance (Topic 860). Repurchase-to-maturity transactions will be accounted for as secured borrowing transactions on the balance sheet and for repurchase financing arrangements, an entity will account separately for a transfer of a financial asset executed contemporaneously with a repurchase agreement with the same counterparty. This will also generally result in secured borrowing accounting for the repurchase agreement. With respect to disclosures, a transferor is required to disclose information about transactions accounted for as a sale in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets through an agreement with the transferee. Additionally, new disclosures are required for repurchase agreements, securities lending transactions, and repurchase-to-maturity transactions that are accounted for as secured borrowings. The new disclosure for transactions accounted for as secured borrowings is required for interim periods beginning after March 15, 2015. These new disclosures are included in Note 9. Borrowings. The adoption of this ASU had no impact on our results of operations or financial position. 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 was permitted. The adoption of this ASU had no 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 was permitted. The adoption of this ASU had no 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 was permitted. This ASU did not have a material impact on our results of operations or financial position. We did not adopt the proportional amortization method. Refer to Note 14 for additional disclosure. Recently Issued Accounting Standards Updates not yet Adopted Intangibles – Goodwill and Other – Internal-Use Software: Customer's Accounting for Fees Paid in a Cloud Computing Arrangement In April 2015, the FASB issued ASU No. 2015-05, Intangibles – Goodwill and Other – Internal-Use Software (Subtopic 350-40): Customer's Accounting for Fees Paid in a Cloud Computing Arrangement. The main provisions of ASU 2015-05 provide a basis for evaluating whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, then the arrangement should be accounted for as a service contract. 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. Interest – Imputation of Interest: Simplifying the Presentation of Debt Issuance Costs In April 2015, the FASB issued ASU No. 2015-03, Interest – Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Costs. The amendments in this ASU require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The standard is required to be adopted by public business entities in annual periods beginning on or after December 15, 2016. We do not expect that this ASU will have a material impact on our results of operations or financial position. Consolidation: Amendments to the Consolidation Analysis In April 2015, the FASB issued ASU No. 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis. The amendments in this ASU affect reporting entities that are required to evaluate whether they should consolidate certain legal entities. All legal entities are subject to reevaluation under the revised consolidation model. Specifically, the amendments: 1) Modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities (VIEs) or voting interest entities, 2) Eliminate the presumption that a general partner should consolidate a limited partnership, 3) Affect the consolidation analysis of reporting entities that are involved with VIEs, particularly those that have fee arrangements and related party relationships, 4) Provide a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2A-7 of the Investment Company Act of 1940 for registered money market funds. The amendments in this ASU are effective for public business entities for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. We are currently evaluating the impact that these amendments may have on our consolidated financial statements. We do not expect that this ASU will have a material impact on our results of operations or financial position. Income Statement – Extraordinary and Unusual Items: Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary In January 2015, the FASB issued ASU No. 2015-01, Income Statement – Extraordinary and Unusual Items (Subtopic 225-20): Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary. The amendments in this ASU eliminate from GAAP the concept of extraordinary items and eliminate the requirements for reporting entities to consider whether an underlying event or transaction is extraordinary. The presentation and disclosure guidance for items that are unusual in nature or occur infrequently will be retained and will be expanded to include items that are both unusual in nature and infrequently occurring. The standard is required to be adopted by public business entities in annual periods beginning on or after December 15, 2015. We do not expect that this ASU will have a material impact on our results of operations or financial position.

Business Combinations (Tables)

Business Combinations (Tables)	6 Months Ended
	Jun. 30, 2015
Business Combinations [Abstract]
Summary of Consideration, Assets Acquired and Liabilities Assumed	The following table summarizes total consideration, assets acquired and liabilities assumed as of June 30, 2015: (dollars in thousands) Consideration Paid Cash $ 29,510 Common stock 142,469 Fair Value of Total Consideration $ 171,979 Fair Value of Assets Acquired Cash and cash equivalents $ 13,163 Securities and other investments 11,502 Loans 788,687 Bank owned life insurance 15,974 Premises and equipment 10,855 Core deposit intangible 5,713 Other assets 19,555 Total Assets Acquired 865,449 Fair Value of Liabilities Assumed Deposits 722,308 Borrowings 82,286 Other liabilities 4,259 Total Liabilities Assumed 808,853 Total Fair Value of Identifiable Net Assets 56,596 Goodwill $ 115,383
Schedule of Pro Forma Information	The following table presents unaudited pro forma financial information which combines the historical consolidated statements of income of S&T and Integrity to give effect to the Merger as if it had occurred on January 1, 2014, for the periods presented. Unaudited Pro Forma Information Three Months Ended June 30, Six Months Ended June 30, (dollars in thousands, except per share data) 2015 2014 2015 2014 Total revenue (1) $ 60,307 $ 57,921 $ 118,992 $ 115,045 Net income (2) $ 18,816 $ 17,765 $ 32,728 $ 33,697 Earnings per common share: (2) Basic $ 0.54 $ 0.51 $ 0.95 $ 0.97 Diluted $ 0.54 $ 0.51 $ 0.94 $ 0.97 (1) Total pro forma revenue is defined as net interest income plus non-interest income, excluding gains and losses on sales of investment securities available-for-sale. ( 2) Excludes merger expenses

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2015
Earnings Per Share [Abstract]
Reconciles Numerators and Denominators of Basic Earnings Per Share with Diluted Earnings Per Share	The following table reconciles the components 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, (in thousands, except shares and per share data) 2015 2014 2015 2014 Numerator for Earnings per Share—Basic: Net income $ 18,188 $ 14,720 $ 31,023 $ 28,753 Less: Income allocated to participating shares 79 29 123 64 Net Income Allocated to Shareholders $ 18,109 $ 14,691 $ 30,900 $ 28,689 Numerator for Earnings per Share—Diluted: Net income 18,188 14,720 $ 31,023 $ 28,753 Net Income Available to Shareholders $ 18,188 $ 14,720 $ 31,023 $ 28,753 Denominators for Earnings per Share: Weighted Average Shares Outstanding—Basic 34,652,895 29,684,300 32,951,936 29,672,611 Add: Potentially dilutive shares 28,283 16,894 36,359 27,559 Denominator for Treasury Stock Method—Diluted 34,681,178 29,701,194 32,988,295 29,700,170 Weighted Average Shares Outstanding—Basic 34,652,895 29,684,300 32,951,936 29,672,611 Add: Average participating shares outstanding 151,134 58,973 131,563 66,563 Denominator for Two-Class Method—Diluted 34,804,029 29,743,273 33,083,499 29,739,174 Earnings per share—basic $ 0.52 $ 0.49 $ 0.94 $ 0.97 Earnings per share—diluted $ 0.52 $ 0.49 $ 0.94 $ 0.97 Warrants considered anti-dilutive excluded from potentially dilutive shares - exercise price $31.53 per share, expires January 2019 517,012 517,012 517,012 517,012 Stock options considered anti-dilutive excluded from potentially dilutive shares 155,500 428,493 155,500 428,676 Restricted stock considered anti-dilutive excluded from potentially dilutive shares 122,851 42,079 95,204 39,005

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2015
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, 2015 and December 31, 2014 . Due to limited trading volume, we transferred marketable equity securities with a fair value of $0.2 million from Level 1 to Level 2 during the six month period ended June 30, 2015. There were no other transfers between Level 1 and Level 2 for items measured at fair value on a recurring basis during the periods presented. June 30, 2015 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Securities available-for-sale: U.S. Treasury securities $ — $ 15,018 $ — $ 15,018 Obligations of U.S. government corporations and agencies — 270,112 — 270,112 Collateralized mortgage obligations of U.S. government corporations and agencies — 139,577 — 139,577 Residential mortgage-backed securities of U.S. government corporations and agencies — 43,419 — 43,419 Commercial mortgage-backed securities of U.S. government corporations and agencies — 49,676 — 49,676 Obligations of states and political subdivisions — 139,947 — 139,947 Marketable equity securities — 8,875 — 8,875 Total securities available-for-sale — 666,624 — 666,624 Trading securities held in a Rabbi Trust 3,796 — — 3,796 Total securities 3,796 666,624 — 670,420 Derivative financial assets: Interest rate swaps — 11,013 — 11,013 Interest rate lock commitments — 366 — 366 Forward sale contracts — 17 — 17 Total Assets $ 3,796 $ 678,020 $ — $ 681,816 LIABILITIES Derivative financial liabilities: Interest rate swaps $ — $ 10,994 $ — $ 10,994 Total Liabilities $ — $ 10,994 $ — $ 10,994 December 31, 2014 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Securities available-for-sale: U.S. Treasury securities $ — $ 14,880 $ — $ 14,880 Obligations of U.S. government corporations and agencies — 269,285 — 269,285 Collateralized mortgage obligations of U.S. government corporations and agencies — 118,006 — 118,006 Residential mortgage-backed securities of U.S. government corporations and agencies — 46,668 — 46,668 Commercial mortgage-backed securities of U.S. government corporations and agencies — 39,673 — 39,673 Obligations of states and political subdivisions — 142,702 — 142,702 Marketable equity securities 178 8,881 — 9,059 Total securities available-for-sale 178 640,095 — 640,273 Trading securities held in a Rabbi Trust 3,456 — — 3,456 Total securities 3,634 640,095 — 643,729 Derivative financial assets: Interest rate swaps — 12,981 — 12,981 Interest rate lock commitments — 235 — 235 Forward sale contracts — — — — Total Assets $ 3,634 $ 653,311 $ — $ 656,945 LIABILITIES Derivative financial liabilities: Interest rate swaps $ — $ 12,953 $ — $ 12,953 Forward sale contracts — 57 — 57 Total Liabilities $ — $ 13,010 $ — $ 13,010
Assets Measured at Estimated Fair Value on Nonrecurring Basis by Fair Value Hierarchy	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, 2015 and December 31, 2014 . There were no liabilities measured at fair value on a nonrecurring basis during these periods. June 30, 2015 December 31, 2014 (dollars in thousands) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total ASSETS (1) Loans held for sale $ — $ — $ 2,900 $ 2,900 $ — $ — $ — $ — Impaired loans — — 13,913 13,913 — — 12,916 12,916 Other real estate owned — — 747 747 — — 117 117 Mortgage servicing rights — — 721 721 — — 1,176 1,176 Total Assets $ — $ — $ 18,281 $ 18,281 $ — $ — $ 14,209 $ 14,209 (1) This table presents only the nonrecurring items that are recorded at fair value in our financial statements.
Carrying Values and Fair Values of Financial Instruments	The carrying values and fair values of our financial instruments at June 30, 2015 and December 31, 2014 are presented in the following tables: Carrying Value (1) Fair Value Measurements at June 30, 2015 (dollars in thousands) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 146,582 $ 146,582 $ 146,582 $ — $ — Securities available-for-sale 666,624 666,624 — 666,624 — Loans held for sale 13,634 13,722 — — 13,722 Portfolio loans, net of unearned income 4,798,498 4,774,871 — — 4,774,871 Bank owned life insurance 79,314 79,314 — 79,314 — FHLB and other restricted stock 23,553 23,553 — — 23,553 Trading securities held in a Rabbi Trust 3,796 3,796 3,796 — — Mortgage servicing rights 2,974 3,137 — — 3,137 Interest rate swaps 11,013 11,013 — 11,013 — Interest rate lock commitments 366 366 — 366 — Forward sale contracts 17 17 — 17 — LIABILITIES Deposits $ 4,859,415 $ 4,865,521 $ — $ — $ 4,865,521 Securities sold under repurchase agreements 46,235 46,235 — — 46,235 Short-term borrowings 230,975 230,975 — — 230,975 Long-term borrowings 118,228 119,148 — — 119,148 Junior subordinated debt securities 45,619 45,619 — — 45,619 Interest rate swaps 10,994 10,994 — 10,994 — (1) As reported in the Consolidated Balance Sheets Carrying Value (1) Fair Value Measurements at December 31, 2014 (dollars in thousands) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 109,580 $ 109,580 $ 109,580 $ — $ — Securities available-for-sale 640,273 640,273 178 640,095 — Loans held for sale 2,970 2,991 — — 2,991 Portfolio loans, net of unearned income 3,868,746 3,827,634 — — 3,827,634 Bank owned life insurance 62,252 62,252 — 62,252 — FHLB and other restricted stock 15,135 15,135 — — 15,135 Trading securities held in a Rabbi Trust 3,456 3,456 3,456 — — Mortgage servicing rights 2,817 2,934 — — 2,934 Interest rate swaps 12,981 12,981 — 12,981 — Interest rate lock commitments 235 235 — 235 — LIABILITIES Deposits $ 3,908,842 $ 3,910,342 $ — $ — $ 3,910,342 Securities sold under repurchase agreements 30,605 30,605 — — 30,605 Short-term borrowings 290,000 290,000 — — 290,000 Long-term borrowings 19,442 20,462 — — 20,462 Junior subordinated debt securities 45,619 45,619 — — 45,619 Interest rate swaps 12,953 12,953 — 12,953 — Forward sale contracts 57 57 — 57 — (1) As reported in the Consolidated Balance Sheets

Securities Available-for-Sale (

Securities Available-for-Sale (Tables)	6 Months Ended
	Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Composition of Securities Available-for-Sale	The following tables present the amortized cost and fair value of available-for-sale securities as of the dates presented: June 30, 2015 December 31, 2014 (dollars in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value U.S. Treasury securities $ 14,893 $ 125 $ — $ 15,018 $ 14,873 $ 7 $ — $ 14,880 Obligations of U.S. government corporations and agencies 267,604 2,935 (427 ) 270,112 268,029 2,334 (1,078 ) 269,285 Collateralized mortgage obligations of U.S. government corporations and agencies 138,160 1,549 (132 ) 139,577 116,897 1,257 (148 ) 118,006 Residential mortgage-backed securities of U.S. government corporations and agencies 42,155 1,450 (186 ) 43,419 45,274 1,548 (154 ) 46,668 Commercial mortgage-backed securities of U.S. government corporations and agencies 49,737 312 (373 ) 49,676 39,834 232 (393 ) 39,673 Obligations of states and political subdivisions 136,540 3,927 (520 ) 139,947 136,977 5,789 (64 ) 142,702 Debt Securities 649,089 10,298 (1,638 ) 657,749 621,884 11,167 (1,837 ) 631,214 Marketable equity securities 7,579 1,296 — 8,875 7,579 1,480 — 9,059 Total $ 656,668 $ 11,594 $ (1,638 ) $ 666,624 $ 629,463 $ 12,647 $ (1,837 ) $ 640,273
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) 2015 2014 2015 2014 Gross realized gains $ — $ 40 $ — $ 41 Gross realized losses 34 — 34 — Net Realized Gains $ (34 ) $ 40 $ (34 ) $ 41
Fair Value and Age of Gross Unrealized Losses by Investment Category	The following tables present the fair value and the age of gross unrealized losses by investment category as of the dates presented: June 30, 2015 Less Than 12 Months 12 Months or More Total (dollars in thousands) Number of Securities Fair Value Unrealized Number of Securities Fair Value Unrealized Number of Securities Fair Value Unrealized Obligations of U.S. government corporations and agencies 4 $ 33,489 $ (215 ) 4 $ 30,033 $ (212 ) 8 $ 63,522 $ (427 ) Collateralized mortgage obligations of U.S. government corporations and agencies 2 17,288 (132 ) — — — 2 17,288 (132 ) Residential mortgage-backed securities of U.S. government corporations and agencies 2 10,704 (186 ) — — — 2 10,704 (186 ) Commercial mortgage-backed securities of U.S. government corporations and agencies 2 20,976 (180 ) 1 9,610 (193 ) 3 30,586 (373 ) Obligations of states and political subdivisions 10 42,967 (520 ) — — — 10 42,967 (520 ) Total Temporarily Impaired Securities 20 $ 125,424 $ (1,233 ) 5 $ 39,643 $ (405 ) 25 $ 165,067 $ (1,638 ) December 31, 2014 Less Than 12 Months 12 Months or More Total (dollars in thousands) Number of Securities Fair Value Unrealized Losses Number of Securities Fair Value Unrealized Losses Number of Securities Fair Value Unrealized Losses Obligations of U.S. government corporations and agencies 4 $ 39,745 $ (207 ) 8 $ 63,149 $ (871 ) 12 $ 102,894 $ (1,078 ) Collateralized mortgage obligations of U.S. government corporations and agencies 1 9,323 (148 ) — — — 1 9,323 (148 ) Residential mortgage-backed securities of U.S. government corporations and agencies — — — 1 8,982 (154 ) 1 8,982 (154 ) Commercial mortgage-backed securities of U.S. government corporations and agencies 1 9,998 (25 ) 2 20,640 (368 ) 3 30,638 (393 ) Obligations of states and political subdivisions 1 263 (1 ) 2 10,756 (63 ) 3 11,019 (64 ) Total Temporarily Impaired Securities 7 $ 59,329 $ (381 ) 13 $ 103,527 $ (1,456 ) 20 $ 162,856 $ (1,837 )
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 (loss)/income for the periods presented: June 30, 2015 December 31, 2014 (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 $ 11,594 $ (1,638 ) $ 9,956 $ 12,647 $ (1,837 ) $ 10,810 Income tax expense/(benefit) 4,058 (573 ) 3,485 4,426 (643 ) 3,783 Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss) $ 7,536 $ (1,065 ) $ 6,471 $ 8,221 $ (1,194 ) $ 7,027
Amortized Cost and Fair Value of Available-for-Sale Securities	The amortized cost and fair value of securities available-for-sale at June 30, 2015 by contractual maturity are included in the table below. Actual maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties. June 30, 2015 (dollars in thousands) Amortized Cost Fair Value Obligations of the U.S. Treasury, U.S. government corporations and agencies, and obligations of states and political subdivisions Due in one year or less $ 29,892 $ 30,223 Due after one year through five years 215,038 217,163 Due after five years through ten years 80,796 82,406 Due after ten years 93,311 95,285 419,037 425,077 Collateralized mortgage obligations of U.S. government corporations and agencies 138,160 139,577 Residential mortgage-backed securities of U.S. government corporations and agencies 42,155 43,419 Commercial mortgage-backed securities of U.S. government corporations and agencies 49,737 49,676 Debt Securities 649,089 657,749 Marketable equity securities 7,579 8,875 Total $ 656,668 $ 666,624

Loans and Loans Held for Sale (

Loans and Loans Held for Sale (Tables)	6 Months Ended
	Jun. 30, 2015
Receivables [Abstract]
Composition of Loans	The following table indicates the composition of the loans as of the dates presented: (dollars in thousands) June 30, 2015 December 31, 2014 Commercial Commercial real estate $ 2,054,935 $ 1,682,236 Commercial and industrial 1,239,382 994,138 Commercial construction 344,983 216,148 Total Commercial Loans 3,639,300 2,892,522 Consumer Residential mortgage 599,502 489,586 Home equity 457,813 418,563 Installment and other consumer 94,437 65,567 Consumer construction 7,446 2,508 Total Consumer Loans 1,159,198 976,224 Total Portfolio Loans 4,798,498 3,868,746 Loans held for sale 13,634 2,970 Total Loans $ 4,812,132 $ 3,871,716
Restructured Loans for Periods Presented	The following table summarizes the restructured loans as of the dates presented: June 30, 2015 December 31, 2014 (dollars in thousands) Performing TDRs Nonperforming TDRs Total TDRs Performing TDRs Nonperforming TDRs Total TDRs Commercial real estate $ 13,045 $ 3,553 $ 16,598 $ 16,939 $ 2,180 $ 19,119 Commercial and industrial 7,899 2,226 10,125 8,074 356 8,430 Commercial construction 5,655 1,969 7,624 5,736 1,869 7,605 Residential mortgage 2,622 609 3,231 2,839 459 3,298 Home equity 3,302 411 3,713 3,342 562 3,904 Installment and other consumer 36 160 196 53 10 63 Total $ 32,559 $ 8,928 $ 41,487 $ 36,983 $ 5,436 $ 42,419
Restructured Loans for Periods Stated	The following tables present the restructured loans during the periods presented: Three Months Ended June 30, 2015 Three Months Ended June 30, 2014 (dollars in thousands) Number of Loans Pre-Modification Outstanding Recorded Investment ( 1) Post-Modification Outstanding Recorded Investment (1) Total Difference in Recorded Investment Number of Loans Pre-Modification Outstanding Recorded Investment (1) Post-Modification Outstanding Recorded Investment (1) Total Difference in Recorded Investment Commercial real estate Principal deferral — $ — $ — $ — 1 $ 129 $ 127 $ (2 ) Commercial and industrial Principal forgiveness 1 400 400 — — — — — Residential mortgage Chapter 7 bankruptcy (2) — — — — 1 52 52 — Maturity date extension and interest rate reduction 2 225 225 — — — — — Home equity Chapter 7 bankruptcy (2) 4 171 171 — 4 43 41 (2 ) Installment and other consumer Chapter 7 bankruptcy (2) — — — $ — 1 9 9 $ — Total by Concession Type Principal forgiveness 1 $ 400 $ 400 $ — — $ — $ — $ — Principal deferral — — — — 1 129 127 (2 ) Maturity date extension and interest rate reduction 2 225 225 — — — — — Chapter 7 bankruptcy (2) 4 171 171 — 6 104 102 (2 ) Total 7 $ 796 $ 796 $ — 7 $ 233 $ 229 $ (4 ) (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. Six Months Ended June 30, 2015 Six Months Ended June 30, 2014 (dollars in thousands) Number of Pre-Modification (1) Post-Modification (1) Total Difference Number of Pre-Modification ( 1) Post-Modification (1) Total Difference Commercial real estate Principal deferral 2 $ 2,851 $ 2,851 $ — 1 $ 129 $ 127 $ (2 ) Commercial and industrial Principal forgiveness 1 400 400 — — — — — Principal deferral 6 661 661 — — — — — Chapter 7 bankruptcy (2) 1 3 1 (2 ) 1 287 286 (1 ) Maturity date extension 1 780 765 (15 ) — — — — Commercial Construction Principal deferral 1 104 103 (1 ) — — — — Maturity date extension — — — — 1 1,019 1,019 — Residential mortgage Chapter 7 bankruptcy (2) — — — — 5 329 327 (2 ) Maturity date extension and interest rate reduction 2 225 225 — — — — — Home equity Chapter 7 bankruptcy (2) 12 313 304 (9 ) 10 269 251 (18 ) Maturity date extension 1 71 71 — — — — — Installment and other consumer Chapter 7 bankruptcy (2) — — — $ — 1 9 9 $ — Total by Concession Type Principal forgiveness 1 $ 400 $ 400 $ — — $ — $ — $ — Principal deferral 9 3,616 3,615 (1 ) 1 129 127 (2 ) Chapter 7 bankruptcy (2) 13 316 305 (11 ) 17 894 873 (21 ) Maturity date extension and interest rate reduction 2 225 225 — — — — — Maturity date extension 2 851 836 (15 ) 1 1,019 1,019 — Total 27 5,408 5,381 $ (27 ) 19 $ 2,042 $ 2,019 $ (23 ) (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.
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 12 months prior to defaulting: Defaulted TDRs Three Months Ended Three Months Ended June 30, 2015 June 30, 2014 (dollars in thousands) Number of Defaults Recorded Investment Number of Defaults Recorded Investment Home equity 2 $ 119 — $ — Total 2 $ 119 — $ — Defaulted TDRs Six Months Ended Six Months Ended June 30, 2015 June 30, 2014 (dollars in thousands) Number of Defaults Recorded Investment Number of Defaults Recorded Investment Residential mortgage 1 $ 183 1 $ 72 Home equity 3 124 — — Total 4 $ 307 1 $ 72
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, 2015 December 31, 2014 Nonperforming Assets Nonaccrual loans $ 10,211 $ 7,021 Nonaccrual TDRs 8,928 5,436 Total nonaccrual loans 19,139 12,457 OREO 750 166 Total Nonperforming Assets $ 19,889 $ 12,623

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	6 Months Ended
	Jun. 30, 2015
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, 2015 and December 31, 2014 : June 30, 2015 (dollars in thousands) Current 30-59 Days Past Due 60-89 Days Past Due 90 Days Past Due (1) Nonaccrual Total Past Due Total Loans Commercial real estate $ 2,032,731 $ 9,656 $ 3,518 $ 1,721 $ 7,309 $ 22,204 $ 2,054,935 Commercial and industrial 1,231,221 2,875 2,143 — 3,143 8,161 1,239,382 Commercial construction 333,897 4,474 — 2,140 4,472 11,086 344,983 Residential mortgage 593,043 1,732 1,770 947 2,010 6,459 599,502 Home equity 453,279 1,971 430 107 2,026 4,534 457,813 Installment and other consumer 93,223 261 774 — 179 1,214 94,437 Consumer construction 7,446 — — — — — 7,446 Loans held for sale 13,634 — — — — — 13,634 Totals $ 4,758,474 $ 20,969 $ 8,635 $ 4,915 $ 19,139 $ 53,658 $ 4,812,132 (1) Represents acquired loans that were recorded at fair value at the acquisition date. December 31, 2014 (dollars in thousands) Current 30-59 Days Past Due 60-89 Days Past Due 90 Days Past Due Nonaccrual Total Past Due Total Loans Commercial real estate $ 1,674,930 $ 2,548 $ 323 $ — $ 4,435 $ 7,306 $ 1,682,236 Commercial and industrial 991,136 1,227 153 — 1,622 3,002 994,138 Commercial construction 214,174 — — — 1,974 1,974 216,148 Residential mortgage 485,465 565 1,220 — 2,336 4,121 489,586 Home equity 414,303 1,756 445 — 2,059 4,260 418,563 Installment and other consumer 65,111 352 73 — 31 456 65,567 Consumer construction 2,508 — — — — — 2,508 Loans held for sale 2,970 — — — — — 2,970 Totals $ 3,850,597 $ 6,448 $ 2,214 $ — $ 12,457 $ 21,119 $ 3,871,716
Recorded Investment in Commercial Loan Classes by Internally Assigned Risk Ratings	The following tables present the recorded investment in commercial loan classes by internally assigned risk ratings as of the dates presented: June 30, 2015 (dollars in thousands) Commercial Real Estate % of Total Commercial and Industrial % of Total Commercial Construction % of Total Total % of Total Pass $ 1,976,311 96.2 % $ 1,158,898 93.5 % $ 300,968 87.3 % $ 3,436,177 94.4 % Special mention 33,328 1.6 % 60,251 4.9 % 26,276 7.6 % 119,855 3.3 % Substandard 45,296 2.2 % 20,233 1.6 % 17,739 5.1 % 83,268 2.3 % Total $ 2,054,935 100 % $ 1,239,382 100.0 % $ 344,983 100.0 % $ 3,639,300 100.0 % December 31, 2014 (dollars in thousands) Commercial Real Estate % of Total Commercial and Industrial % of Total Commercial Construction % of Total Total % of Total Pass $ 1,635,132 97.2 % $ 948,663 95.4 % $ 196,520 90.9 % $ 2,780,315 96.1 % Special mention 23,597 1.4 % 30,357 3.1 % 12,014 5.6 % 65,968 2.3 % Substandard 23,507 1.4 % 15,118 1.5 % 7,614 3.5 % 46,239 1.6 % Total $ 1,682,236 100.0 % $ 994,138 100.0 % $ 216,148 100.0 % $ 2,892,522 100.0 %
Recorded Investment in Consumer Loan Classes by Performing and Nonperforming Status	The following tables present the recorded investment in consumer loan classes by performing and nonperforming status as of the dates presented: June 30, 2015 (dollars in thousands) Residential Mortgage % of Total Home Equity % of Total Installment and other consumer % of Total Consumer Construction % of Total Total % of Total Performing $ 597,492 99.7 % $ 455,787 99.6 % $ 94,258 99.8 % $ 7,446 100.0 % $ 1,154,983 99.6 % Nonperforming 2,010 0.3 % 2,026 0.4 % 179 0.2 % — — % 4,215 0.4 % Total $ 599,502 100.0 % $ 457,813 100.0 % $ 94,437 100.0 % $ 7,446 100.0 % $ 1,159,198 100.0 % December 31, 2014 (dollars in thousands) Residential Mortgage % of Total Home Equity % of Total Installment and other consumer % of Total Consumer Construction % of Total Total % of Total Performing $ 487,250 99.5 % $ 416,504 99.5 % $ 65,536 99.9 % $ 2,508 100.0 % $ 971,798 99.5 % Nonperforming 2,336 0.5 % 2,059 0.5 % 31 0.1 % — — % 4,426 0.5 % Total $ 489,586 100.0 % $ 418,563 100.0 % $ 65,567 100.0 % $ 2,508 100.0 % $ 976,224 100.0 %
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: Three Months Ended June 30, 2015 June 30, 2014 (dollars in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Without a related allowance recorded: Commercial real estate $ 19,733 $ 158 $ 21,382 $ 159 Commercial and industrial 10,782 84 9,317 57 Commercial construction 8,119 81 8,279 57 Consumer real estate 6,891 91 7,166 100 Other consumer 126 4 109 1 Total without a Related Allowance Recorded 45,651 418 46,253 374 With a related allowance recorded: Commercial real estate 420 — — — Commercial and industrial — — — — Commercial construction — — — — Consumer real estate 121 2 48 1 Other consumer 4 — 22 — Total with a Related Allowance Recorded 545 2 70 1 Total: Commercial real estate 20,153 158 21,382 159 Commercial and industrial 10,782 84 9,317 57 Commercial construction 8,119 81 8,279 57 Consumer real estate 7,012 93 7,214 101 Other consumer 130 4 131 1 Total $ 46,196 $ 420 $ 46,323 $ 375 Six Months Ended June 30, 2015 June 30, 2014 (dollars in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Without a related allowance recorded: Commercial real estate $ 20,455 $ 322 $ 21,980 $ 329 Commercial and industrial 11,162 146 9,066 114 Commercial construction 6,628 134 8,301 114 Consumer real estate 6,943 186 7,260 203 Other consumer 86 4 112 2 Total without a Related Allowance Recorded 45,274 792 46,719 762 With a related allowance recorded: Commercial real estate $ 211 $ — $ — $ — Commercial and industrial — — — — Commercial construction — — — — Consumer real estate 122 3 50 2 Other consumer 4 — 23 1 Total with a Related Allowance Recorded 337 3 73 3 Total: Commercial real estate 20,666 322 21,980 329 Commercial and industrial 11,162 146 9,066 114 Commercial construction 6,628 134 8,301 114 Consumer real estate 7,065 189 7,310 205 Other consumer 90 4 135 3 Total $ 45,611 $ 795 $ 46,792 $ 765 The following tables summarize investments in loans considered to be impaired and the related information on those impaired loans as of the dates presented: June 30, 2015 December 31, 2014 (dollars in thousands) Recorded Investment Unpaid Principal Balance Related Allowance Recorded Investment Unpaid Principal Balance Related Allowance Without a related allowance recorded: Commercial real estate $ 18,548 $ 25,698 $ — $ 19,890 $ 25,262 $ — Commercial and industrial 10,125 11,877 — 9,218 9,449 — Commercial construction 9,293 12,983 — 7,605 11,293 — Consumer real estate 6,824 7,527 — 7,159 7,733 — Other consumer 192 197 — 42 48 — Total without a Related Allowance Recorded 44,982 58,282 — 43,914 53,785 — With a related allowance recorded: Commercial real estate 749 749 567 — — — Commercial and industrial — — — — — — Commercial construction — — — — — — Consumer real estate 120 120 37 43 43 43 Other consumer 4 4 4 20 20 11 Total with a Related Allowance Recorded 873 873 608 63 63 54 Total: Commercial real estate 19,297 26,447 567 19,890 25,262 — Commercial and industrial 10,125 11,877 — 9,218 9,449 — Commercial construction 9,293 12,983 — 7,605 11,293 — Consumer real estate 6,944 7,647 37 7,202 7,776 43 Other consumer 196 201 4 62 68 11 Total $ 45,855 $ 59,155 $ 608 $ 43,977 $ 53,848 $ 54
Summary of Allowance for Loan Losses	The following tables detail activity in the ALL for the periods presented: Three Months Ended June 30, 2015 (dollars in thousands) Commercial Real Estate Commercial and Industrial Commercial Construction Consumer Real Estate Other Consumer Total Loans Balance at beginning of period $ 19,071 $ 13,711 $ 6,869 $ 6,723 $ 1,732 $ 48,106 Charge-offs (310 ) (992 ) — (177 ) (276 ) (1,755 ) Recoveries 73 89 1 112 129 404 Net (Charge-offs)/ Recoveries (237 ) (903 ) 1 (65 ) (147 ) (1,351 ) Provision for loan losses 184 500 801 369 205 2,059 Balance at End of Period $ 19,018 $ 13,308 $ 7,671 $ 7,027 $ 1,790 $ 48,814 Three Months Ended June 30, 2014 (dollars in thousands) Commercial Real Estate Commercial and Industrial Commercial Construction Consumer Real Estate Other Consumer Total 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 (Charge-offs)/ Recoveries (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 Six Months Ended June 30, 2015 (dollars in thousands) Commercial Real Estate Commercial and Industrial Commercial Construction Consumer Real Estate Other Consumer Total Loans Balance at beginning of period $ 20,164 $ 13,668 $ 6,093 $ 6,333 $ 1,653 $ 47,911 Charge-offs (376 ) (1,698 ) — (552 ) (579 ) (3,205 ) Recoveries 176 203 2 248 213 842 Net (Charge-offs)/Recoveries (200 ) (1,495 ) 2 (304 ) (366 ) (2,363 ) Provision for loan losses (946 ) 1,135 1,576 998 503 3,266 Balance at End of Period $ 19,018 $ 13,308 $ 7,671 $ 7,027 $ 1,790 $ 48,814 Six Months Ended June 30, 2014 (dollars in thousands) Commercial Real Estate Commercial and Industrial Commercial Construction Consumer Real Estate Other Consumer Total 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 (Charge-offs)/Recoveries (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
Summary of Allowance for Loan Losses and Recorded Investments	The following tables present the ALL and recorded investments in loans by category as of the periods presented: June 30, 2015 Allowance for Loan Losses Portfolio Loans (dollars in thousands) Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Individually Evaluated for Impairment Collectively Evaluated for Impairment Total (1) Commercial real estate $ 567 $ 18,451 $ 19,018 $ 19,297 $ 2,035,638 $ 2,054,935 Commercial and industrial — 13,308 13,308 10,125 1,229,257 1,239,382 Commercial construction — 7,671 7,671 9,293 335,690 344,983 Consumer real estate 37 6,990 7,027 6,944 1,057,817 1,064,761 Other consumer 4 1,786 1,790 196 94,241 94,437 Total $ 608 $ 48,206 $ 48,814 $ 45,855 $ 4,752,643 $ 4,798,498 (1) Includes acquired loans. December 31, 2014 Allowance for Loan Losses Portfolio Loans (dollars in thousands) Individually Evaluated for Impairment Collectively Evaluated for Impairment Total Individually Evaluated for Impairment Collectively Evaluated for Impairment Total (1) Commercial real estate $ — $ 20,164 $ 20,164 $ 19,890 $ 1,662,346 $ 1,682,236 Commercial and industrial — 13,668 13,668 9,218 984,920 994,138 Commercial construction — 6,093 6,093 7,605 208,543 216,148 Consumer real estate 43 6,290 6,333 7,202 903,455 910,657 Other consumer 11 1,642 1,653 62 65,505 65,567 Total $ 54 $ 47,857 $ 47,911 $ 43,977 $ 3,824,769 $ 3,868,746 (1) Includes acquired loans.

Derivative Instruments and He29

Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2015
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 (included in Other Assets) Derivatives (included in Other Liabilities) (dollars in thousands) June 30, 2015 December 31, 2014 June 30, 2015 December 31, 2014 Derivatives not Designated as Hedging Instruments: Interest Rate Swap Contracts- Commercial Loans Fair value $ 11,013 $ 12,981 $ 10,994 $ 12,953 Notional amount 233,777 245,152 233,777 245,152 Collateral posted — — 12,489 12,059 Interest Rate Lock Commitments- Mortgage Loans Fair value 366 235 — — Notional amount 14,034 8,822 — — Forward Sale Contracts- Mortgage Loans Fair value 17 — — 57 Notional amount $ 13,812 $ — $ — $ 7,789
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 (included in Other Assets) Derivatives (included in Other Liabilities) (dollars in thousands) June 30, 2015 December 31, 2014 June 30, 2015 December 31, 2014 Derivatives not Designated as Hedging Instruments: Gross amounts recognized $ 11,030 $ 13,203 $ 11,011 $ 13,175 Gross amounts offset (17 ) (222 ) (17 ) (222 ) Net amounts presented in the Consolidated Balance Sheets 11,013 12,981 10,994 12,953 Gross amounts not offset (1) — — (12,489 ) (12,059 ) Net Amount $ 11,013 $ 12,981 $ (1,495 ) $ 894 (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) 2015 2014 2015 2014 Derivatives not Designated as Hedging Instruments Interest rate swap contracts—commercial loans $ (21 ) $ (11 ) $ (8 ) $ (19 ) Interest rate lock commitments—mortgage loans (8 ) 199 128 207 Forward sale contracts—mortgage loans 92 (64 ) 74 (93 ) Total Derivatives Gain (Loss) $ 63 $ 124 $ 194 $ 95

Borrowings (Tables)

Borrowings (Tables)	6 Months Ended
	Jun. 30, 2015
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, 2015 December 31, 2014 (dollars in thousands) Balance Weighted Average Rate Balance Weighted Average Rate Short-term borrowings Securities sold under repurchase agreements $ 46,235 0.01 % $ 30,605 0.01 % Short-term borrowings 230,975 0.33 % 290,000 0.31 % Total short-term borrowings 277,210 0.28 % 320,605 0.27 % Long-term borrowings Other long-term borrowings 118,228 0.76 % 19,442 3.00 % Junior subordinated debt securities 45,619 2.74 % 45,619 2.70 % Total long-term borrowings 163,847 1.31 % 65,061 2.79 % Total Borrowings $ 441,057 0.66 % $ 385,666 0.70 %

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2015
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, 2015 December 31, 2014 Commitments to extend credit $ 1,453,491 $ 1,158,628 Standby letters of credit 98,838 73,584 Total $ 1,552,329 $ 1,232,212

Other Comprehensive Income (Tab

Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2015
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, 2015 Three Months Ended June 30, 2014 (dollars in thousands) Pre-Tax Amount Tax (Expense) Benefit Net of Tax Amount Pre-Tax Amount Tax (Expense) Benefit Net of Tax Amount Change in unrealized (losses)/gains on securities available-for-sale $ (5,872 ) $ 2,056 $ (3,816 ) $ 5,401 $ (1,891 ) $ 3,510 Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income (1) 34 (12 ) 22 (40 ) 15 (25 ) Adjustment to funded status of employee benefit plans 463 (162 ) 301 211 (74 ) 137 Other Comprehensive (Loss)/Income $ (5,375 ) $ 1,882 $ (3,493 ) $ 5,572 $ (1,950 ) $ 3,622 (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/losses-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, 2015 Six Months Ended June 30, 2014 (dollars in thousands) Pre-Tax Amount Tax (Expense) Benefit Net of Tax Amount Pre-Tax Amount Tax (Expense) Benefit Net of Tax Amount Change in unrealized (losses)/ gains on securities available-for-sale $ (889 ) $ 311 $ (578 ) $ 9,876 $ (3,457 ) $ 6,419 Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income (1) 34 (12 ) 22 (41 ) 15 (26 ) Adjustment to funded status of employee benefit plans 1,192 (324 ) 868 423 (148 ) 275 Other Comprehensive Income $ 337 $ (25 ) $ 312 $ 10,258 $ (3,590 ) $ 6,668 (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/losses-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, 2015
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) 2015 2014 2015 2014 Components of Net Periodic Pension Cost Service cost—benefits earned during the period $ 672 $ 631 $ 1,344 $ 1,262 Interest cost on projected benefit obligation 1,100 1,106 2,200 2,212 Expected return on plan assets (1,807 ) (1,735 ) (3,614 ) (3,470 ) Amortization of prior service (credit) cost (35 ) (35 ) (70 ) (70 ) Recognized net actuarial loss 468 209 936 418 Net Periodic Pension Expense $ 398 $ 176 $ 796 $ 352

Segments (Tables)

Segments (Tables)	6 Months Ended
	Jun. 30, 2015
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, 2015 December 31, 2014 Community Banking $ 6,121,771 $ 4,954,728 Insurance 8,232 7,468 Wealth Management 3,725 2,490 Total Assets $ 6,133,728 $ 4,964,686
Financial Information of Segments	The following tables provide financial information for our three operating segments for the three and six month periods ended June 30, 2015 and 2014 . The financial results of the business segments include allocations for shared services based on an internal analysis that supports line of business and branch performance measurement. Shared services include expenses such as employee benefits, occupancy expense, computer support and other corporate overhead. Even with these allocations, the financial results are not necessarily indicative of the business segments’ financial condition and results of operations as 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, 2015 (dollars in thousands) Community Banking Insurance Wealth Management Eliminations Consolidated Interest income $ 52,598 $ 1 $ 157 $ (145 ) $ 52,611 Interest expense 4,056 — — (256 ) 3,800 Net interest income 48,542 1 157 111 48,811 Provision for loan losses 2,059 — — — 2,059 Noninterest income 8,869 1,328 2,917 269 13,383 Noninterest expense 29,916 1,053 2,285 380 33,634 Depreciation expense 1,279 14 6 — 1,299 Amortization of intangible assets 495 13 8 — 516 Provision for income taxes 6,139 88 271 — 6,498 Net Income $ 17,523 $ 161 $ 504 $ — $ 18,188 Three Months Ended June 30, 2014 (dollars in thousands) Community Banking Insurance Wealth Management Eliminations Consolidated 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 Six Months Ended June 30, 2015 (dollars in thousands) Community Banking Insurance Wealth Management Eliminations Consolidated Interest income $ 96,483 $ 1 $ 298 $ (256 ) $ 96,526 Interest expense 7,944 — — (488 ) 7,456 Net interest income 88,539 1 298 232 89,070 Provision for loan losses 3,266 — — — 3,266 Noninterest income 16,406 2,881 5,833 347 25,467 Noninterest expense 58,603 2,190 4,505 579 65,877 Depreciation expense 2,290 26 13 — 2,329 Amortization of intangible assets 822 25 17 — 864 Provision for income taxes 10,396 224 558 — 11,178 Net Income $ 29,568 $ 417 $ 1,038 $ — $ 31,023 Six Months Ended June 30, 2014 (dollars in thousands) Community Banking Insurance Wealth Management Eliminations Consolidated 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

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Detail)	Jun. 30, 2015
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%

Business Combinations - Additio

Business Combinations - Additional Information (Details) - USD ($)	Jun. 30, 2015	Mar. 04, 2015	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 291,204,000		$ 291,204,000		$ 291,204,000		$ 175,820,000
Discount on loans acquired	14,700,000		14,700,000		14,700,000
Merger related expenses			866,000	$ 0	3,167,000	$ 0
Professional services and legal			801,000	$ 875,000	1,324,000	$ 1,538,000
Integrity Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Business acquisition, percentage of voting interests acquired		100.00%
Business acquisition, cash per share offered in exchange of share		$ 52.50
Shares of S&T offered for each share of Integrity (shares)		2.0627
Fair value of total consideration	171,979,000	$ 172,000,000
Cash		$ 29,500,000			29,510,000
S&T common shares issued (shares)		4,933,115
S&T common shares issued, fair value (in USD per share)		$ 28.88
Goodwill, purchase accounting adjustments			600,000
Goodwill	115,383,000	$ 115,400,000	115,383,000		115,383,000
Carryover of allowance for loan losses		0
Fair value of loans acquired	$ 788,687,000	788,700,000	$ 788,687,000		788,687,000
Discount on loans acquired		14,800,000
Merger related expenses					3,200,000
Data processing, contract termination and conversion cost expenses					1,300,000
Professional services and legal					1,200,000
Severance payments					400,000
Other expenses					$ 300,000
Commercial Real Estate [Member] | Integrity Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fair value of loans acquired		331,600,000
Commercial and Industrial [Member] | Integrity Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fair value of loans acquired		184,200,000
Construction Loans [Member] | Integrity Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fair value of loans acquired		92,400,000
Residential Mortgage [Member] | Integrity Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fair value of loans acquired		116,900,000
Home Equity [Member] | Integrity Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fair value of loans acquired		25,600,000
Consumer Borrower [Member] | Integrity Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fair value of loans acquired		36,100,000
Consumer Construction [Member] | Integrity Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Fair value of loans acquired		$ 1,900,000

Business Combinations - Conside

Business Combinations - Consideration, Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Mar. 04, 2015	Jun. 30, 2015	Dec. 31, 2014
Fair Value of Liabilities Assumed
Goodwill	$ 291,204		$ 291,204	$ 175,820
Integrity Bancshares, Inc. [Member]
Business Acquisition [Line Items]
Cash		$ 29,500	29,510
Common stock	142,469		142,469
Fair value of total consideration	171,979	172,000
Fair Value of Assets Acquired
Cash and cash equivalents	13,163		13,163
Securities and other investments	11,502		11,502
Loans	788,687	788,700	788,687
Bank owned life insurance	15,974		15,974
Premises and equipment	10,855		10,855
Core deposit intangible	5,713		5,713
Other assets	19,555		19,555
Total Assets Acquired	865,449		865,449
Fair Value of Liabilities Assumed
Deposits	722,308		722,308
Borrowings	82,286		82,286
Other liabilities	4,259		4,259
Total Liabilities Assumed	808,853		808,853
Total Fair Value of Identifiable Net Assets	56,596		56,596
Goodwill	$ 115,383	$ 115,400	$ 115,383

Business Combinations - Pro For

Business Combinations - Pro Forma Information (Details) - Integrity Bancshares, Inc. [Member] - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Business Acquisition, Pro Forma Information [Abstract]
Total revenue(1)	[1]	$ 60,307	$ 57,921	$ 118,992	$ 115,045
Net income	[2]	$ 18,816	$ 17,765	$ 32,728	$ 33,697
Earnings per common share:
Basic (in USD per share)	[2]	$ 0.54	$ 0.51	$ 0.95	$ 0.97
Diluted (in USD per share)	[2]	$ 0.54	$ 0.51	$ 0.94	$ 0.97
[1]	Total pro forma revenue is defined as net interest income plus non-interest income, excluding gains and losses on sales of investment securities available-for-sale.
[2]	Excludes merger expenses

Earnings Per Share - Reconciles

Earnings Per Share - Reconciles Numerators and Denominators of Basic Earnings Per Share with Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Numerator for Earnings per Share-Basic:
Net income	$ 18,188	$ 14,720	$ 31,023	$ 28,753
Less: Income allocated to participating shares	79	29	123	64
Net Income Allocated to Shareholders	18,109	14,691	30,900	28,689
Numerator for Earnings per Share-Diluted:
Net income	18,188	14,720	31,023	28,753
Net Income Available to Shareholders	$ 18,188	$ 14,720	$ 31,023	$ 28,753
Denominators:
Weighted Average Shares Outstanding-Basic	34,652,895	29,684,300	32,951,936	29,672,611
Add: Potentially dilutive shares	28,283	16,894	36,359	27,559
Denominator for Treasury Stock Method-Diluted	34,681,178	29,701,194	32,988,295	29,700,170
Weighted Average Shares Outstanding-Basic	34,652,895	29,684,300	32,951,936	29,672,611
Add: Average participating shares outstanding	151,134	58,973	131,563	66,563
Denominator for Two-Class Method-Diluted	34,804,029	29,743,273	33,083,499	29,739,174
Earnings per share—basic (in dollars per share)	$ 0.52	$ 0.49	$ 0.94	$ 0.97
Earnings per share—diluted (in dollars per share)	0.52	$ 0.49	0.94	$ 0.97
Anti-dilutive warrants - exercise price (in USD per share)	$ 31.53		$ 31.53
Warrants [Member]
Denominators:
Anti-dilutive excluded from potentially dilutive shares	517,012	517,012	517,012	517,012
Stock Options [Member]
Denominators:
Anti-dilutive excluded from potentially dilutive shares	155,500	428,493	155,500	428,676
Restricted Stock [Member]
Denominators:
Anti-dilutive excluded from potentially dilutive shares	122,851	42,079	95,204	39,005

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of asset transfer from Level 1 to Level 2 on recurring basis	$ 200,000	$ 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
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at estimated fair value on a recurring basis		0
Liabilities measured at estimated fair value on a recurring basis	0	$ 0
Fair Value Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at estimated fair value on a recurring basis	0
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at estimated fair value on nonrecurring basis	$ 0

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
ASSETS
Total securities available-for-sale	$ 666,624	$ 640,273
US Treasury Securities [Member]
ASSETS
Total securities available-for-sale	15,018	14,880
Obligations of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	270,112	269,285
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	139,577	118,006
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	43,419	46,668
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	49,676	39,673
Obligations of States and Political Subdivisions [Member]
ASSETS
Total securities available-for-sale	139,947	142,702
Marketable Equity Securities [Member]
ASSETS
Total securities available-for-sale	8,875	9,059
Fair Value Measurements, Recurring [Member]
ASSETS
Total securities available-for-sale	666,624	640,273
Trading securities held in a Rabbi Trust	3,796	3,456
Total securities	670,420	643,729
Total Assets	681,816	656,945
LIABILITIES
Total Liabilities	10,994	13,010
Fair Value Measurements, Recurring [Member] | US Treasury Securities [Member]
ASSETS
Total securities available-for-sale	15,018	14,880
Fair Value Measurements, Recurring [Member] | Obligations of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	270,112	269,285
Fair Value Measurements, Recurring [Member] | Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	139,577	118,006
Fair Value Measurements, Recurring [Member] | Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	43,419	46,668
Fair Value Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	49,676	39,673
Fair Value Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member]
ASSETS
Total securities available-for-sale	139,947	142,702
Fair Value Measurements, Recurring [Member] | Marketable Equity Securities [Member]
ASSETS
Total securities available-for-sale	8,875	9,059
Fair Value Measurements, Recurring [Member] | Interest Rate Swaps [Member]
ASSETS
Derivative financial assets	11,013	12,981
LIABILITIES
Derivative financial liabilities	10,994	12,953
Fair Value Measurements, Recurring [Member] | Interest Rate Lock Commitments [Member]
ASSETS
Derivative financial assets	366	235
Fair Value Measurements, Recurring [Member] | Forward Sale Contracts [Member]
ASSETS
Derivative financial assets	17	0
LIABILITIES
Derivative financial liabilities		57
Level 1 [Member] | Fair Value Measurements, Recurring [Member]
ASSETS
Total securities available-for-sale	0	178
Trading securities held in a Rabbi Trust	3,796	3,456
Total securities	3,796	3,634
Total Assets	3,796	3,634
LIABILITIES
Total Liabilities	0
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | US Treasury Securities [Member]
ASSETS
Total securities available-for-sale		0
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Marketable Equity Securities [Member]
ASSETS
Total securities available-for-sale	0	178
Level 1 [Member] | Fair Value Measurements, Recurring [Member] | Forward Sale Contracts [Member]
ASSETS
Derivative financial assets	0
Level 2 [Member] | Fair Value Measurements, Recurring [Member]
ASSETS
Total securities available-for-sale	666,624	640,095
Total securities	666,624	640,095
Total Assets	678,020	653,311
LIABILITIES
Total Liabilities	10,994	13,010
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | US Treasury Securities [Member]
ASSETS
Total securities available-for-sale	15,018	14,880
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Obligations of U.S. Government Corporations and Agencies [Member]
ASSETS
Total securities available-for-sale	270,112	269,285
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	139,577	118,006
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	43,419	46,668
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	49,676	39,673
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Obligations of States and Political Subdivisions [Member]
ASSETS
Total securities available-for-sale	139,947	142,702
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Marketable Equity Securities [Member]
ASSETS
Total securities available-for-sale	8,875	8,881
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Interest Rate Swaps [Member]
ASSETS
Derivative financial assets	11,013	12,981
LIABILITIES
Derivative financial liabilities	10,994	12,953
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Interest Rate Lock Commitments [Member]
ASSETS
Derivative financial assets	366	235
Level 2 [Member] | Fair Value Measurements, Recurring [Member] | Forward Sale Contracts [Member]
ASSETS
Derivative financial assets	17	0
LIABILITIES
Derivative financial liabilities		57
Level 3 [Member] | Fair Value Measurements, Recurring [Member]
LIABILITIES
Total Liabilities	0
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | US Treasury Securities [Member]
ASSETS
Total securities available-for-sale		$ 0
Level 3 [Member] | Fair Value Measurements, Recurring [Member] | Forward Sale Contracts [Member]
ASSETS
Derivative financial assets	$ 0

Fair Value Measurements - Ass42

Fair Value Measurements - Assets Measured at Estimated Fair Value on Nonrecurring Basis by Fair Value Hierarchy (Detail) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
ASSETS
Loans held for sale	$ 2,900
Impaired loans	13,913	$ 12,916
Other Assets, Fair Value Disclosure	747	117
Mortgage servicing rights	721	1,176
Total Assets	18,281	14,209
Level 3 [Member]
ASSETS
Loans held for sale	2,900
Impaired loans	13,913	12,916
Other Assets, Fair Value Disclosure	747	117
Mortgage servicing rights	721	1,176
Total Assets	$ 18,281	$ 14,209

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Values and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
ASSETS
Securities available-for-sale		$ 666,624	$ 640,273
FHLB and other restricted stock		23,553	15,135
LIABILITIES
Junior subordinated debt securities		45,619	45,619
Carrying Value [Member]
ASSETS
Cash and due from banks, including interest-bearing deposits	[1]	146,582	109,580
Securities available-for-sale	[1]	666,624	640,273
Loans held for sale	[1]	13,634	2,970
Portfolio loans, net of unearned income	[1]	4,798,498	3,868,746
Bank owned life insurance	[1]	79,314	62,252
FHLB and other restricted stock	[1]	23,553	15,135
Trading securities held in a Rabbi Trust	[1]	3,796	3,456
Mortgage servicing rights	[1]	2,974	2,817
LIABILITIES
Deposits	[1]	4,859,415	3,908,842
Securities sold under repurchase agreements	[1]	46,235	30,605
Short-term borrowings	[1]	230,975	290,000
Long-term borrowings	[1]	118,228	19,442
Junior subordinated debt securities	[1]	45,619	45,619
Carrying Value [Member] | Interest Rate Swaps [Member]
ASSETS
Derivative financial assets	[1]	11,013	12,981
LIABILITIES
Derivative financial liabilities	[1]	10,994	12,953
Carrying Value [Member] | Interest Rate Lock Commitments [Member]
ASSETS
Derivative financial assets	[1]	366	235
Carrying Value [Member] | Forward Sale Contracts [Member]
ASSETS
Derivative financial assets		17
LIABILITIES
Derivative financial liabilities	[1]		57
Fair Value Measurements [Member]
ASSETS
Cash and due from banks, including interest-bearing deposits		146,582	109,580
Securities available-for-sale		666,624	640,273
Loans held for sale		13,722	2,991
Portfolio loans, net of unearned income		4,774,871	3,827,634
Bank owned life insurance		79,314	62,252
FHLB and other restricted stock		23,553	15,135
Trading securities held in a Rabbi Trust		3,796	3,456
Mortgage servicing rights		3,137	2,934
LIABILITIES
Deposits		4,865,521	3,910,342
Securities sold under repurchase agreements		46,235	30,605
Short-term borrowings		230,975	290,000
Long-term borrowings		119,148	20,462
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		146,582	109,580
Securities available-for-sale		0	178
Loans held for sale		0	0
Portfolio loans, net of unearned income		0	0
Bank owned life insurance		0	0
FHLB and other restricted stock		0	0
Trading securities held in a Rabbi Trust		3,796	3,456
Mortgage servicing rights		0	0
LIABILITIES
Deposits		0	0
Securities sold under repurchase agreements		0	0
Short-term borrowings		0	0
Long-term borrowings		0	0
Junior subordinated debt securities		0	0
Fair Value Measurements [Member] | Level 2 [Member]
ASSETS
Cash and due from banks, including interest-bearing deposits		0	0
Securities available-for-sale		666,624	640,095
Loans held for sale		0	0
Portfolio loans, net of unearned income		0	0
Bank owned life insurance		79,314	62,252
FHLB and other restricted stock		0	0
Trading securities held in a Rabbi Trust		0	0
Mortgage servicing rights		0	0
LIABILITIES
Deposits		0	0
Securities sold under repurchase agreements		0	0
Short-term borrowings		0	0
Long-term borrowings		0	0
Junior subordinated debt securities		0	0
Fair Value Measurements [Member] | Level 3 [Member]
ASSETS
Cash and due from banks, including interest-bearing deposits		0	0
Securities available-for-sale		0	0
Loans held for sale		13,722	2,991
Portfolio loans, net of unearned income		4,774,871	3,827,634
Bank owned life insurance		0	0
FHLB and other restricted stock		23,553	15,135
Trading securities held in a Rabbi Trust		0	0
Mortgage servicing rights		3,137	2,934
LIABILITIES
Deposits		4,865,521	3,910,342
Securities sold under repurchase agreements		46,235	30,605
Short-term borrowings		230,975	290,000
Long-term borrowings		119,148	20,462
Junior subordinated debt securities		45,619	45,619
Fair Value Measurements [Member] | Interest Rate Swaps [Member]
ASSETS
Derivative financial assets		11,013	12,981
LIABILITIES
Derivative financial liabilities		10,994	12,953
Fair Value Measurements [Member] | Interest Rate Swaps [Member] | Level 1 [Member]
ASSETS
Derivative financial assets		0	0
LIABILITIES
Derivative financial liabilities		0	0
Fair Value Measurements [Member] | Interest Rate Swaps [Member] | Level 2 [Member]
ASSETS
Derivative financial assets		11,013	12,981
LIABILITIES
Derivative financial liabilities		10,994	12,953
Fair Value Measurements [Member] | Interest Rate Swaps [Member] | Level 3 [Member]
ASSETS
Derivative financial assets		0	0
LIABILITIES
Derivative financial liabilities		0	0
Fair Value Measurements [Member] | Interest Rate Lock Commitments [Member]
ASSETS
Derivative financial assets		366	235
Fair Value Measurements [Member] | Interest Rate Lock Commitments [Member] | Level 1 [Member]
ASSETS
Derivative financial assets		0	0
Fair Value Measurements [Member] | Interest Rate Lock Commitments [Member] | Level 2 [Member]
ASSETS
Derivative financial assets		366	235
Fair Value Measurements [Member] | Interest Rate Lock Commitments [Member] | Level 3 [Member]
ASSETS
Derivative financial assets		0	0
Fair Value Measurements [Member] | Forward Sale Contracts [Member]
ASSETS
Derivative financial assets		17
LIABILITIES
Derivative financial liabilities			57
Fair Value Measurements [Member] | Forward Sale Contracts [Member] | Level 1 [Member]
ASSETS
Derivative financial assets		0
LIABILITIES
Derivative financial liabilities			0
Fair Value Measurements [Member] | Forward Sale Contracts [Member] | Level 2 [Member]
ASSETS
Derivative financial assets		17
LIABILITIES
Derivative financial liabilities			57
Fair Value Measurements [Member] | Forward Sale Contracts [Member] | Level 3 [Member]
ASSETS
Derivative financial assets		$ 0
LIABILITIES
Derivative financial liabilities			$ 0
[1]	As reported in the Consolidated Balance Sheets.

Securities Available-for-Sale -

Securities Available-for-Sale - Composition of Securities Available-for-Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 656,668	$ 629,463
Gross Unrealized Gains	11,594	12,647
Gross Unrealized Losses	(1,638)	(1,837)
Fair Value	666,624	640,273
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,893	14,873
Gross Unrealized Gains	125	7
Fair Value	15,018	14,880
Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	267,604	268,029
Gross Unrealized Gains	2,935	2,334
Gross Unrealized Losses	(427)	(1,078)
Fair Value	270,112	269,285
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	138,160	116,897
Gross Unrealized Gains	1,549	1,257
Gross Unrealized Losses	(132)	(148)
Fair Value	139,577	118,006
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	42,155	45,274
Gross Unrealized Gains	1,450	1,548
Gross Unrealized Losses	(186)	(154)
Fair Value	43,419	46,668
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	49,737	39,834
Gross Unrealized Gains	312	232
Gross Unrealized Losses	(373)	(393)
Fair Value	49,676	39,673
Obligations of States and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	136,540	136,977
Gross Unrealized Gains	3,927	5,789
Gross Unrealized Losses	(520)	(64)
Fair Value	139,947	142,702
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	649,089	621,884
Gross Unrealized Gains	10,298	11,167
Gross Unrealized Losses	(1,638)	(1,837)
Fair Value	657,749	631,214
Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,579	7,579
Gross Unrealized Gains	1,296	1,480
Fair Value	$ 8,875	$ 9,059

Securities Available-for-Sale45

Securities Available-for-Sale - Schedule of Gross and Net Realized Gains and Losses on Sale of Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]
Gross realized gains		$ 40		$ 41
Gross realized losses	$ 34		$ 34
Net Realized Gains	$ (34)	$ 40	$ (34)	$ 41

Securities Available-for-Sale46

Securities Available-for-Sale - Fair Value and Age of Gross Unrealized Losses by Investment Category (Detail) $ in Thousands	Jun. 30, 2015USD ($)security	Dec. 31, 2014USD ($)security
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	20	7
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 125,424	$ 59,329
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ (1,233)	$ (381)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	5	13
Available-for-sale Securities, 12 Months or More, Fair Value	$ 39,643	$ 103,527
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ (405)	$ (1,456)
Available-for-sale, Securities, Number of Positions | security	25	20
Available-for-sale Securities, Fair Value, Total	$ 165,067	$ 162,856
Available-for-sale Securities, Unrealized Losses, Total	$ (1,638)	$ (1,837)
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 | security	4	4
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 33,489	$ 39,745
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ (215)	$ (207)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	4	8
Available-for-sale Securities, 12 Months or More, Fair Value	$ 30,033	$ 63,149
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ (212)	$ (871)
Available-for-sale, Securities, Number of Positions | security	8	12
Available-for-sale Securities, Fair Value, Total	$ 63,522	$ 102,894
Available-for-sale Securities, Unrealized Losses, Total	$ (427)	$ (1,078)
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 | security	2	1
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 17,288	$ 9,323
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ (132)	$ (148)
Available-for-sale, Securities, Number of Positions | security	2	1
Available-for-sale Securities, Fair Value, Total	$ 17,288	$ 9,323
Available-for-sale Securities, Unrealized Losses, Total	$ (132)	$ (148)
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 | security	2
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 10,704
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ (186)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security		1
Available-for-sale Securities, 12 Months or More, Fair Value		$ 8,982
Available-for-sale Securities, 12 Months or More, Unrealized Losses		$ (154)
Available-for-sale, Securities, Number of Positions | security	2	1
Available-for-sale Securities, Fair Value, Total	$ 10,704	$ 8,982
Available-for-sale Securities, Unrealized Losses, Total	$ (186)	$ (154)
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 | security	2	1
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 20,976	$ 9,998
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ (180)	$ (25)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	1	2
Available-for-sale Securities, 12 Months or More, Fair Value	$ 9,610	$ 20,640
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ (193)	$ (368)
Available-for-sale, Securities, Number of Positions | security	3	3
Available-for-sale Securities, Fair Value, Total	$ 30,586	$ 30,638
Available-for-sale Securities, Unrealized Losses, Total	$ (373)	$ (393)
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 | security	10	1
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 42,967	$ 263
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ (520)	$ (1)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security		2
Available-for-sale Securities, 12 Months or More, Fair Value		$ 10,756
Available-for-sale Securities, 12 Months or More, Unrealized Losses		$ (63)
Available-for-sale, Securities, Number of Positions | security	10	3
Available-for-sale Securities, Fair Value, Total	$ 42,967	$ 11,019
Available-for-sale Securities, Unrealized Losses, Total	$ (520)	$ (64)

Securities Available-for-Sale47

Securities Available-for-Sale - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2015USD ($)security	Dec. 31, 2014USD ($)
Schedule of Available-for-sale Securities [Line Items]
Number of debt securities on which unrealized losses were primarily attributable to changes in interest | security	25
Carrying values of securities	$ 326,300,000	$ 289,100,000
Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses reclassified out of accumulated other comprehensive income into earnings	$ 0

Securities Available-for-sale48

Securities Available-for-sale - Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Total unrealized gains/(losses) on securities available for sale, Gross Unrealized Gains	$ 11,594	$ 12,647
Total unrealized gains/(losses) on securities available for sale, Gross Unrealized Losses	(1,638)	(1,837)
Total unrealized gains/(losses) on securities available for sale, Net Unrealized Gains/(Losses)	9,956	10,810
Income Tax expense/(benefit), Gross Unrealized Gains	4,058	4,426
Income Tax expense/(benefit), Gross Unrealized Losses	(573)	(643)
Income Tax expense/(benefit), Net Unrealized Gains/ (Losses)	3,485	3,783
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Gross Unrealized Gains	7,536	8,221
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Gross Unrealized Losses	(1,065)	(1,194)
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Net Unrealized Gains/ (Losses)	$ 6,471	$ 7,027

Securities Available-for-Sale49

Securities Available-for-Sale - Amortized Cost and Fair Value of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 656,668	$ 629,463
Fair Value	666,624	640,273
Obligations of the U.S. Treasury and 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	29,892
Due after one year through five years, Amortized Cost	215,038
Due after five years through ten years, Amortized Cost	80,796
Due after ten years, Amortized Cost	93,311
Available-for-sale Securities, Debt Maturities, Amortized Cost	419,037
Due in one year or less, Fair Value	30,223
Due after one year through five years, Fair Value	217,163
Due after five years through ten years, Fair Value	82,406
Due after ten years, Fair Value	95,285
Fair Value, Debt securities	425,077
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	138,160	116,897
Fair Value	139,577	118,006
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	42,155	45,274
Fair Value	43,419	46,668
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	49,737	39,834
Fair Value	49,676	39,673
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	649,089	621,884
Fair Value	657,749	631,214
Marketable Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,579	7,579
Fair Value	$ 8,875	$ 9,059

Loans and Loans Held for Sale -

Loans and Loans Held for Sale - Additional Information (Detail) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2015USD ($)SecurityLoan	Jun. 30, 2015USD ($)SecurityLoan	Mar. 04, 2015USD ($)	Dec. 31, 2014USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Deferred Income	$ 14,000	$ 14,000		$ 2,100
Discount on loans related to purchase accounting fair value adjustments	$ 14,700	$ 14,700
Percentage of commercial loans in total portfolio loans	76.00%	76.00%		75.00%
Commercial Loans	$ 3,639,300	$ 3,639,300		$ 2,892,522
Concentration Risk, Product		no
Maximum concentration of commercial real estate and commercial construction portfolio in loans (in excess of)	7.00%	7.00%		7.00%
Minimum period of loan payment defaults following restructure for TDRs to be in default		90 days
Commercial Real Estate and Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans	$ 2,400,000	$ 2,400,000
Combined percentage of commercial real estate and commercial construction in total commercial loans	66.00%	66.00%		66.00%
Combined percentage of commercial real estate and commercial construction in total portfolio loans	50.00%	50.00%		49.00%
Out Of State Exposure Of Combined Portfolio	6.30%	6.30%		8.00%
Percentage of total loans out-of-state excluding contiguous states	3.10%	3.10%		3.90%
Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans	$ 344,983	$ 344,983		$ 216,148
Number Of Loans Modified Not Considered To Be Troubled Debt Restructuring | SecurityLoan	4	4
Loans modified not considered to be troubled debt restructuring	$ 1,300	$ 1,300
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans	$ 2,054,935	$ 2,054,935		1,682,236
Number Of Loans Modified Not Considered To Be Troubled Debt Restructuring | SecurityLoan	1	3
Loans modified not considered to be troubled debt restructuring	$ 800	$ 1,000
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number Of Loans Modified Not Considered To Be Troubled Debt Restructuring | SecurityLoan	2	2
Loans modified not considered to be troubled debt restructuring	$ 200	$ 200
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans	$ 1,239,382	$ 1,239,382		$ 994,138
Number Of Loans Modified Not Considered To Be Troubled Debt Restructuring | SecurityLoan	4	6
Loans modified not considered to be troubled debt restructuring	$ 5,500	$ 5,700
Integrity Bancshares, Inc. [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Discount on loans related to purchase accounting fair value adjustments			$ 14,800
Integrity Bancshares, Inc. [Member] | Commercial Real Estate and Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans	$ 424,000	$ 424,000

Loans and Loans Held for Sale51

Loans and Loans Held for Sale - Composition of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Composition of the loans
Commercial Loans	$ 3,639,300	$ 2,892,522
Consumer Loans	1,159,198	976,224
Total Portfolio Loans	4,798,498	3,868,746
Loans held for sale	13,634	2,970
Total Loans	4,812,132	3,871,716
Commercial Real Estate [Member]
Composition of the loans
Commercial Loans	2,054,935	1,682,236
Total Portfolio Loans	2,054,935	1,682,236
Total Loans	2,054,935	1,682,236
Commercial and Industrial [Member]
Composition of the loans
Commercial Loans	1,239,382	994,138
Total Portfolio Loans	1,239,382	994,138
Total Loans	1,239,382	994,138
Construction Loans [Member]
Composition of the loans
Commercial Loans	344,983	216,148
Total Portfolio Loans	344,983	216,148
Total Loans	344,983	216,148
Residential Mortgage [Member]
Composition of the loans
Consumer Loans	599,502	489,586
Total Loans	599,502	489,586
Home Equity [Member]
Composition of the loans
Consumer Loans	457,813	418,563
Total Loans	457,813	418,563
Consumer Borrower [Member]
Composition of the loans
Consumer Loans	94,437	65,567
Total Loans	94,437	65,567
Consumer Construction [Member]
Composition of the loans
Consumer Loans	7,446	2,508
Total Loans	$ 7,446	$ 2,508

Loans and Loans Held for Sale52

Loans and Loans Held for Sale - Restructured Loans for Periods Presented (Detail) $ in Thousands	3 Months Ended				6 Months Ended				12 Months Ended
	Jun. 30, 2015USD ($)SecurityLoan		Jun. 30, 2014USD ($)SecurityLoan		Jun. 30, 2015USD ($)SecurityLoan		Jun. 30, 2014USD ($)SecurityLoan		Dec. 31, 2014USD ($)
Financing Receivable, Modifications [Line Items]
Threshold period of satisfactory performance for TDR to be restored to accruing status					6 months
Restructured loans	$ 796	[1]	$ 229	[1]	$ 5,381	[2]	$ 2,019	[1]
Number of TDRs returned to accruing status | SecurityLoan	6		0		6		0
TDRs returned to accruing status	$ 300				$ 300
Maximum concentration of commercial real estate and commercial construction portfolio in loans (in excess of)	7.00%				7.00%				7.00%
Performing Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					$ 32,559				$ 36,983
Performing Financial Instruments [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					13,045				16,939
Performing Financial Instruments [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					7,899				8,074
Performing Financial Instruments [Member] | Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					5,655				5,736
Performing Financial Instruments [Member] | Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					2,622				2,839
Performing Financial Instruments [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					3,302				3,342
Performing Financial Instruments [Member] | Consumer Borrower [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					36				53
Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					8,928				5,436
Nonperforming Financial Instruments [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					3,553				2,180
Nonperforming Financial Instruments [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					2,226				356
Nonperforming Financial Instruments [Member] | Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					1,969				1,869
Nonperforming Financial Instruments [Member] | Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					609				459
Nonperforming Financial Instruments [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					411				562
Nonperforming Financial Instruments [Member] | Consumer Borrower [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					160				10
Financing Receivable [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					41,487				42,419
Financing Receivable [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					16,598				19,119
Financing Receivable [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					10,125				8,430
Financing Receivable [Member] | Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					7,624				7,605
Financing Receivable [Member] | Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					3,231				3,298
Financing Receivable [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					3,713				3,904
Financing Receivable [Member] | Consumer Borrower [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans					$ 196				$ 63
[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]	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 Sale53

Loans and Loans Held for Sale - Restructured Loans for Periods Stated (Detail)		3 Months Ended				6 Months Ended
		Jun. 30, 2015USD ($)SecurityLoan		Jun. 30, 2014USD ($)SecurityLoan		Jun. 30, 2015USD ($)SecurityLoan		Jun. 30, 2014USD ($)SecurityLoan
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan		7		7		27		19
Pre-Modification Outstanding Recorded Investment		$ 796,000	[1]	$ 233,000	[1]	$ 5,408,000	[2]	$ 2,042,000	[1]
Post-Modification Outstanding Recorded Investment		$ 796,000	[1]	229,000	[1]	5,381,000	[2]	2,019,000	[1]
Total Difference in Recorded Investment				$ (4,000)		$ (27,000)		$ (23,000)
Principal Forgiveness [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan		1	[3]			1		0
Pre-Modification Outstanding Recorded Investment		$ 400,000	[1],[3]			$ 400,000	[2]	$ 0	[2]
Post-Modification Outstanding Recorded Investment		$ 400,000	[1],[3]			400,000	[2]	0	[2]
Total Difference in Recorded Investment						$ 0		$ 0
Principal Forgiveness [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan		1				1		0
Pre-Modification Outstanding Recorded Investment		$ 400,000	[1]			$ 400,000	[2]	$ 0	[2]
Post-Modification Outstanding Recorded Investment		$ 400,000	[1]			$ 400,000	[2]	$ 0	[2]
Principal Deferral [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan				1		9		1
Pre-Modification Outstanding Recorded Investment				$ 129,000	[1]	$ 3,616,000	[2]	$ 129,000	[2]
Post-Modification Outstanding Recorded Investment				127,000	[1]	3,615,000	[2]	127,000	[2]
Total Difference in Recorded Investment				$ (2,000)		$ (1,000)		$ (2,000)
Principal Deferral [Member] | Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan				1		2		1
Pre-Modification Outstanding Recorded Investment				$ 129,000	[1]	$ 2,851,000	[2]	$ 129,000	[2]
Post-Modification Outstanding Recorded Investment				127,000	[1]	$ 2,851,000	[2]	127,000	[2]
Total Difference in Recorded Investment				$ (2,000)				(2,000)
Principal Deferral [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan						6
Pre-Modification Outstanding Recorded Investment	[2]					$ 661,000		0
Post-Modification Outstanding Recorded Investment	[2]					$ 661,000		0
Principal Deferral [Member] | Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan						1
Pre-Modification Outstanding Recorded Investment	[2]					$ 104,000		0
Post-Modification Outstanding Recorded Investment	[2]					103,000		$ 0
Total Difference in Recorded Investment						$ (1,000)
Chapter 7 Bankruptcy [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan		4		6		13	[4]	17	[4]
Pre-Modification Outstanding Recorded Investment		$ 171,000	[1]	$ 104,000	[1]	$ 316,000	[2],[4]	$ 894,000	[2],[4]
Post-Modification Outstanding Recorded Investment		$ 171,000	[1]	102,000	[1]	305,000	[2],[4]	873,000	[2],[4]
Total Difference in Recorded Investment				$ (2,000)		$ (11,000)	[4]	$ (21,000)	[4]
Chapter 7 Bankruptcy [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	[4]					1		1
Pre-Modification Outstanding Recorded Investment	[2],[4]					$ 3,000		$ 287,000
Post-Modification Outstanding Recorded Investment	[2],[4]					1,000		286,000
Total Difference in Recorded Investment	[4]					$ (2,000)		$ (1,000)
Chapter 7 Bankruptcy [Member] | Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan				1				5	[4]
Pre-Modification Outstanding Recorded Investment				$ 52,000	[1]			$ 329,000	[2],[4]
Post-Modification Outstanding Recorded Investment				$ 52,000	[1]			327,000	[2],[4]
Total Difference in Recorded Investment	[4]							$ (2,000)
Chapter 7 Bankruptcy [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan		4		4		12	[4]	10	[4]
Pre-Modification Outstanding Recorded Investment		$ 171,000	[1]	$ 43,000	[1]	$ 313,000	[2],[4]	$ 269,000	[2],[4]
Post-Modification Outstanding Recorded Investment		$ 171,000	[1]	41,000	[1]	304,000	[2],[4]	251,000	[2],[4]
Total Difference in Recorded Investment				$ (2,000)		$ (9,000)	[4]	$ (18,000)	[4]
Chapter 7 Bankruptcy [Member] | Consumer Borrower [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan				1				1	[4]
Pre-Modification Outstanding Recorded Investment				$ 9,000	[1]			$ 9,000	[2],[4]
Post-Modification Outstanding Recorded Investment				$ 9,000	[1]			9,000	[2],[4]
Interest Rate Reduction and Maturity Date Extension [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan						2
Pre-Modification Outstanding Recorded Investment	[2]					$ 225,000		0
Post-Modification Outstanding Recorded Investment	[2]					$ 225,000		$ 0
Interest Rate Reduction and Maturity Date Extension [Member] | Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan		2
Pre-Modification Outstanding Recorded Investment		$ 225,000
Post-Modification Outstanding Recorded Investment		$ 225,000
Maturity Date Extension [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan						2		1
Pre-Modification Outstanding Recorded Investment	[2]					$ 851,000		$ 1,019,000
Post-Modification Outstanding Recorded Investment	[2]					836,000		1,019,000
Total Difference in Recorded Investment						$ (15,000)
Maturity Date Extension [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan						1
Pre-Modification Outstanding Recorded Investment	[2]					$ 780,000		0
Post-Modification Outstanding Recorded Investment	[2]					765,000		$ 0
Total Difference in Recorded Investment						$ (15,000)
Maturity Date Extension [Member] | Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans								1
Pre-Modification Outstanding Recorded Investment	[2]							$ 1,019,000
Post-Modification Outstanding Recorded Investment	[2]							1,019,000
Maturity Date Extension [Member] | Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan						2
Pre-Modification Outstanding Recorded Investment	[2]					$ 225,000		0
Post-Modification Outstanding Recorded Investment	[2]					$ 225,000		0
Maturity Date Extension [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan						1
Pre-Modification Outstanding Recorded Investment	[2]					$ 71,000		0
Post-Modification Outstanding Recorded Investment	[2]					$ 71,000		$ 0
[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]	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.
[3]	Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.
[4]	Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.

Loans and Loans Held for Sale54

Loans and Loans Held for Sale - Summary of Nonperforming Assets of Defaulted TDRs (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015USD ($)Contract	Jun. 30, 2014USD ($)Contract	Jun. 30, 2015USD ($)Contract	Jun. 30, 2014USD ($)Contract
Financing Receivable, Modifications [Line Items]
Number of Defaults	2	0	4	1
Recorded Investment | $	$ 119	$ 0	$ 307	$ 72
Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults			1	1
Recorded Investment | $			$ 183	$ 72
Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	2		3
Recorded Investment | $	$ 119		$ 124

Loans and Loans Held for Sale55

Loans and Loans Held for Sale - Summary of Nonperforming Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Nonperforming Assets
Nonaccrual loans	$ 10,211	$ 7,021
Nonaccrual TDRs	8,928	5,436
Total nonaccrual loans	19,139	12,457
OREO	750	166
Total Nonperforming Assets	$ 19,889	$ 12,623

Allowance for Loan Losses - Age

Allowance for Loan Losses - Age Analysis of Past Due Loans Segregated by Class of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	$ 4,758,474	$ 3,850,597
Total nonaccrual loans	19,139	12,457
Total past due	53,658	21,119
Total Loans	4,812,132	3,871,716
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	2,032,731	1,674,930
Total nonaccrual loans	7,309	4,435
Total past due	22,204	7,306
Total Loans	2,054,935	1,682,236
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	1,231,221	991,136
Total nonaccrual loans	3,143	1,622
Total past due	8,161	3,002
Total Loans	1,239,382	994,138
Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	333,897	214,174
Total nonaccrual loans	4,472	1,974
Total past due	11,086	1,974
Total Loans	344,983	216,148
Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	593,043	485,465
Total nonaccrual loans	2,010	2,336
Total past due	6,459	4,121
Total Loans	599,502	489,586
Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	453,279	414,303
Total nonaccrual loans	2,026	2,059
Total past due	4,534	4,260
Total Loans	457,813	418,563
Consumer Borrower [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	93,223	65,111
Total nonaccrual loans	179	31
Total past due	1,214	456
Total Loans	94,437	65,567
Consumer Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	7,446	2,508
Total Loans	7,446	2,508
Loans Held for Sale [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	13,634	2,970
Total Loans	13,634	2,970
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	20,969	6,448
30 to 59 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	9,656	2,548
30 to 59 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,875	1,227
30 to 59 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	4,474
30 to 59 Days Past Due [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,732	565
30 to 59 Days Past Due [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,971	1,756
30 to 59 Days Past Due [Member] | Consumer Borrower [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	261	352
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	8,635	2,214
60 to 89 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	3,518	323
60 to 89 Days Past Due [Member] | Commercial and Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,143	153
60 to 89 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due		0
60 to 89 Days Past Due [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,770	1,220
60 to 89 Days Past Due [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	430	445
60 to 89 Days Past Due [Member] | Consumer Borrower [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	774	73
90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	4,915	$ 0
90 Days Past Due [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,721
90 Days Past Due [Member] | Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,140
90 Days Past Due [Member] | Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	947
90 Days Past Due [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 107

Allowance for Loan Losses - Rec

Allowance for Loan Losses - Recorded Investment in Commercial Loan Classes by Internally Assigned Risk Ratings (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 3,639,300	$ 2,892,522
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	$ 3,436,177	$ 2,780,315
Total percentage of recorded investment in commercial loan	94.40%	96.10%
Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 119,855	$ 65,968
Total percentage of recorded investment in commercial loan	3.30%	2.30%
Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 83,268	$ 46,239
Total percentage of recorded investment in commercial loan	2.30%	1.60%
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 2,054,935	$ 1,682,236
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	$ 1,976,311	$ 1,635,132
Total percentage of recorded investment in commercial loan	96.20%	97.20%
Commercial Real Estate [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 33,328	$ 23,597
Total percentage of recorded investment in commercial loan	1.60%	1.40%
Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 45,296	$ 23,507
Total percentage of recorded investment in commercial loan	2.20%	1.40%
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 1,239,382	$ 994,138
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	$ 1,158,898	$ 948,663
Total percentage of recorded investment in commercial loan	93.50%	95.40%
Commercial and Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 60,251	$ 30,357
Total percentage of recorded investment in commercial loan	4.90%	3.10%
Commercial and Industrial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 20,233	$ 15,118
Total percentage of recorded investment in commercial loan	1.60%	1.50%
Construction Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 344,983	$ 216,148
Total percentage of recorded investment in commercial loan	100.00%	100.00%
Construction Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 300,968	$ 196,520
Total percentage of recorded investment in commercial loan	87.30%	90.90%
Construction Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 26,276	$ 12,014
Total percentage of recorded investment in commercial loan	7.60%	5.60%
Construction Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Total recorded investment in commercial loan	$ 17,739	$ 7,614
Total percentage of recorded investment in commercial loan	5.10%	3.50%

Allowance for Loan Losses - Add

Allowance for Loan Losses - Additional Information (Detail) - Jun. 30, 2015 - USD ($)	Total
Financing Receivable, Impaired [Line Items]
Evaluation for impairment of substandard and nonaccrual commercial loans	$ 500,000
Minimum [Member]
Financing Receivable, Impaired [Line Items]
Loans considered nonperforming (in days)	90 days

Allowance for Loan Losses - R59

Allowance for Loan Losses - Recorded Investment in Consumer Loan Classes by Performing and Nonperforming Status (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 1,159,198	$ 976,224
Percentage of Total	100.00%	100.00%
Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 1,154,983	$ 971,798
Percentage of Total	99.60%	99.50%
Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 4,215	$ 4,426
Percentage of Total	0.40%	0.50%
Residential Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 599,502	$ 489,586
Percentage of Total	100.00%	100.00%
Residential Mortgage [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 597,492	$ 487,250
Percentage of Total	99.70%	99.50%
Residential Mortgage [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 2,010	$ 2,336
Percentage of Total	0.30%	0.50%
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 457,813	$ 418,563
Percentage of Total	100.00%	100.00%
Home Equity [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 455,787	$ 416,504
Percentage of Total	99.60%	99.50%
Home Equity [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 2,026	$ 2,059
Percentage of Total	0.40%	0.50%
Consumer Borrower [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 94,437	$ 65,567
Percentage of Total	100.00%	100.00%
Consumer Borrower [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 94,258	$ 65,536
Percentage of Total	99.80%	99.90%
Consumer Borrower [Member] | Nonperforming Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 179	$ 31
Percentage of Total	0.20%	0.10%
Consumer Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 7,446	$ 2,508
Percentage of Total	100.00%	100.00%
Consumer Construction [Member] | Performing Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded investment in consumer loan	$ 7,446	$ 2,508
Percentage of Total	100.00%	100.00%

Allowance for Loan Losses - Inv

Allowance for Loan Losses - Investments in Loans Considered to be Impaired and Related Information on Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Without a related allowance recorded, Recorded Investment	$ 44,982		$ 44,982		$ 43,914
Without a related allowance, Unpaid Principal Balance	58,282		58,282		53,785
Without a related allowance recorded, Related Allowance	0		0		0
With a related allowance recorded, Recorded Investment	873		873		63
With a related allowance recorded, Unpaid Principal Balance	873		873		63
Impaired Financing Receivable, Recorded Investment, Total	45,855		45,855		43,977
Impaired Financing Receivable, Unpaid Principal Balance, Total	59,155		59,155		53,848
Impaired Financing Receivable, Related Allowance	608		608		54
Without a related allowance recorded, Average Recorded Investment	45,651	$ 46,253	45,274	$ 46,719
Without a related allowance recorded, Interest Income Recognized	418	374	792	762
With a related allowance recorded, Average Recorded Investment	545	70	337	73
With a related allowance recorded, Interest Income Recognized	2	1	3	3
Impaired Financing Receivable, Average Recorded Investment, Total	46,196	46,323	45,611	46,792
Impaired Financing Receivable, Interest Income Recognized, Total	420	375	795	765
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Without a related allowance recorded, Recorded Investment	18,548		18,548		19,890
Without a related allowance, Unpaid Principal Balance	25,698		25,698		25,262
With a related allowance recorded, Recorded Investment	749		749
With a related allowance recorded, Unpaid Principal Balance	749		749
Impaired Financing Receivable, Recorded Investment, Total	19,297		19,297		19,890
Impaired Financing Receivable, Unpaid Principal Balance, Total	26,447		26,447		25,262
Impaired Financing Receivable, Related Allowance	567		567
Without a related allowance recorded, Average Recorded Investment	19,733	21,382	20,455	21,980
Without a related allowance recorded, Interest Income Recognized	158	159	322	329
With a related allowance recorded, Average Recorded Investment	420		211
Impaired Financing Receivable, Average Recorded Investment, Total	20,153	21,382	20,666	21,980
Impaired Financing Receivable, Interest Income Recognized, Total	158	159	322	329
Commercial and Industrial [Member]
Financing Receivable, Impaired [Line Items]
Without a related allowance recorded, Recorded Investment	10,125		10,125		9,218
Without a related allowance, Unpaid Principal Balance	11,877		11,877		9,449
Impaired Financing Receivable, Recorded Investment, Total	10,125		10,125		9,218
Impaired Financing Receivable, Unpaid Principal Balance, Total	11,877		11,877		9,449
Without a related allowance recorded, Average Recorded Investment	10,782	9,317	11,162	9,066
Without a related allowance recorded, Interest Income Recognized	84	57	146	114
Impaired Financing Receivable, Average Recorded Investment, Total	10,782	9,317	11,162	9,066
Impaired Financing Receivable, Interest Income Recognized, Total	84	57	146	114
Construction Loans [Member]
Financing Receivable, Impaired [Line Items]
Without a related allowance recorded, Recorded Investment	9,293		9,293		7,605
Without a related allowance, Unpaid Principal Balance	12,983		12,983		11,293
Impaired Financing Receivable, Recorded Investment, Total	9,293		9,293		7,605
Impaired Financing Receivable, Unpaid Principal Balance, Total	12,983		12,983		11,293
Without a related allowance recorded, Average Recorded Investment	8,119	8,279	6,628	8,301
Without a related allowance recorded, Interest Income Recognized	81	57	134	114
Impaired Financing Receivable, Average Recorded Investment, Total	8,119	8,279	6,628	8,301
Impaired Financing Receivable, Interest Income Recognized, Total	81	57	134	114
Consumer Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Without a related allowance recorded, Recorded Investment	6,824		6,824		7,159
Without a related allowance, Unpaid Principal Balance	7,527		7,527		7,733
With a related allowance recorded, Recorded Investment	120		120		43
With a related allowance recorded, Unpaid Principal Balance	120		120		43
Impaired Financing Receivable, Recorded Investment, Total	6,944		6,944		7,202
Impaired Financing Receivable, Unpaid Principal Balance, Total	7,647		7,647		7,776
Impaired Financing Receivable, Related Allowance	37		37		43
Without a related allowance recorded, Average Recorded Investment	6,891	7,166	6,943	7,260
Without a related allowance recorded, Interest Income Recognized	91	100	186	203
With a related allowance recorded, Average Recorded Investment	121	48	122	50
With a related allowance recorded, Interest Income Recognized	2	1	3	2
Impaired Financing Receivable, Average Recorded Investment, Total	7,012	7,214	7,065	7,310
Impaired Financing Receivable, Interest Income Recognized, Total	93	101	189	205
Other Consumer [Member]
Financing Receivable, Impaired [Line Items]
Without a related allowance recorded, Recorded Investment	192		192		42
Without a related allowance, Unpaid Principal Balance	197		197		48
With a related allowance recorded, Recorded Investment	4		4		20
With a related allowance recorded, Unpaid Principal Balance	4		4		20
Impaired Financing Receivable, Recorded Investment, Total	196		196		62
Impaired Financing Receivable, Unpaid Principal Balance, Total	201		201		68
Impaired Financing Receivable, Related Allowance	4		4		$ 11
Without a related allowance recorded, Average Recorded Investment	126	109	86	112
Without a related allowance recorded, Interest Income Recognized	4	1	4	2
With a related allowance recorded, Average Recorded Investment	4	22	4	23
With a related allowance recorded, Interest Income Recognized				1
Impaired Financing Receivable, Average Recorded Investment, Total	130	131	90	135
Impaired Financing Receivable, Interest Income Recognized, Total	$ 4	$ 1	$ 4	$ 3

Allowance for Loan Losses - Sum

Allowance for Loan Losses - Summary of Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 48,106	$ 46,616	$ 47,911	$ 46,255
Charge-offs	(1,755)	(3,746)	(3,205)	(4,721)
Recoveries	404	4,844	842	5,891
Net (Charge-offs)/ Recoveries	(1,351)	1,098	(2,363)	1,170
Provision for loan losses	2,059	(1,134)	3,266	(845)
Balance at End of Period	48,814	46,580	48,814	46,580
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	19,071	19,880	20,164	18,921
Charge-offs	(310)	(1,737)	(376)	(2,004)
Recoveries	73	1,294	176	1,834
Net (Charge-offs)/ Recoveries	(237)	(443)	(200)	(170)
Provision for loan losses	184	1,296	(946)	1,982
Balance at End of Period	19,018	20,733	19,018	20,733
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	13,711	13,979	13,668	14,433
Charge-offs	(992)	(743)	(1,698)	(1,033)
Recoveries	89	2,936	203	3,249
Net (Charge-offs)/ Recoveries	(903)	2,193	(1,495)	2,216
Provision for loan losses	500	(3,168)	1,135	(3,645)
Balance at End of Period	13,308	13,004	13,308	13,004
Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	6,869	5,183	6,093	5,374
Charge-offs		(664)		(692)
Recoveries	1	324	2	375
Net (Charge-offs)/ Recoveries	1	(340)	2	(317)
Provision for loan losses	801	(84)	1,576	(298)
Balance at End of Period	7,671	4,759	7,671	4,759
Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	6,723	6,408	6,333	6,362
Charge-offs	(177)	(425)	(552)	(547)
Recoveries	112	164	248	223
Net (Charge-offs)/ Recoveries	(65)	(261)	(304)	(324)
Provision for loan losses	369	558	998	667
Balance at End of Period	7,027	6,705	7,027	6,705
Other Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	1,732	1,166	1,653	1,165
Charge-offs	(276)	(177)	(579)	(445)
Recoveries	129	126	213	210
Net (Charge-offs)/ Recoveries	(147)	(51)	(366)	(235)
Provision for loan losses	205	264	503	449
Balance at End of Period	$ 1,790	$ 1,379	$ 1,790	$ 1,379

Allowance for Loan Losses - S62

Allowance for Loan Losses - Summary of Allowance for Loan Losses and Recorded Investments (Detail) - USD ($)	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	$ 608,000		$ 54,000
Allowance for Loan Losses, Collectively Evaluated for Impairment	48,206,000		47,857,000
Total Allowance for Loan Losses	48,814,000	$ 48,106,000	47,911,000	$ 46,580,000	$ 46,616,000	$ 46,255,000
Portfolio Loans, Individually Evaluated for Impairment	45,855,000		43,977,000
Portfolio Loans, Collectively Evaluated for Impairment	4,752,643,000		3,824,769,000
Total Portfolio Loans	4,798,498,000		3,868,746,000
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	567,000
Allowance for Loan Losses, Collectively Evaluated for Impairment	18,451,000		20,164,000
Total Allowance for Loan Losses	19,018,000	19,071,000	20,164,000	20,733,000	19,880,000	18,921,000
Portfolio Loans, Individually Evaluated for Impairment	19,297,000		19,890,000
Portfolio Loans, Collectively Evaluated for Impairment	2,035,638,000		1,662,346,000
Total Portfolio Loans	2,054,935,000		1,682,236,000
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Collectively Evaluated for Impairment	13,308,000		13,668,000
Total Allowance for Loan Losses	13,308,000	13,711,000	13,668,000	13,004,000	13,979,000	14,433,000
Portfolio Loans, Individually Evaluated for Impairment	10,125,000		9,218,000
Portfolio Loans, Collectively Evaluated for Impairment	1,229,257,000		984,920,000
Total Portfolio Loans	1,239,382,000		994,138,000
Construction Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Collectively Evaluated for Impairment	7,671,000		6,093,000
Total Allowance for Loan Losses	7,671,000	6,869,000	6,093,000	4,759,000	5,183,000	5,374,000
Portfolio Loans, Individually Evaluated for Impairment	9,293,000		7,605,000
Portfolio Loans, Collectively Evaluated for Impairment	335,690,000		208,543,000
Total Portfolio Loans	344,983,000		216,148,000
Consumer Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	37,000		43,000
Allowance for Loan Losses, Collectively Evaluated for Impairment	6,990,000		6,290,000
Total Allowance for Loan Losses	7,027,000	6,723,000	6,333,000	6,705,000	6,408,000	6,362,000
Portfolio Loans, Individually Evaluated for Impairment	6,944,000		7,202,000
Portfolio Loans, Collectively Evaluated for Impairment	1,057,817,000		903,455,000
Total Portfolio Loans	1,064,761,000		910,657,000
Other Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	4,000		11,000
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,786,000		1,642,000
Total Allowance for Loan Losses	1,790,000	$ 1,732,000	1,653,000	$ 1,379,000	$ 1,166,000	$ 1,165,000
Portfolio Loans, Individually Evaluated for Impairment	196,000		62,000
Portfolio Loans, Collectively Evaluated for Impairment	94,241,000		65,505,000
Total Portfolio Loans	94,437,000		$ 65,567,000
Fair Value Measurements [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses on acquired loans	$ 0

Derivative Instruments and He63

Derivative Instruments and Hedging Activities - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Period for commitments	60 days

Derivative Instruments and He64

Derivative Instruments and Hedging Activities - Value of Derivative Assets and Derivative Liabilities (Detail) - Not Designated as Hedging Instruments [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Assets)	$ 11,013	$ 12,981
Fair value, Derivatives (included in Other Liabilities)	10,994	12,953
Other Assets [Member] | Interest Rate Swap Contracts-Commercial Loans [Member]
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Assets)	11,013	12,981
Notional amount, Derivatives (included in Other Assets)	233,777	245,152
Other Assets [Member] | Interest Rate Lock Commitments [Member]
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Assets)	366	235
Notional amount, Derivatives (included in Other Assets)	14,034	8,822
Other Assets [Member] | Forward Sale Contracts-Mortgage Loans [Member]
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Assets)	17
Notional amount, Derivatives (included in Other Assets)	13,812
Other Liabilities [Member] | Interest Rate Swap Contracts-Commercial Loans [Member]
Derivatives not Designated as Hedging Instruments
Collateral posted	12,489	12,059
Fair value, Derivatives (included in Other Liabilities)	10,994	12,953
Notional amount, Derivatives (included in Other Liabilities)	$ 233,777	245,152
Other Liabilities [Member] | Forward Sale Contracts-Mortgage Loans [Member]
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Liabilities)		57
Notional amount, Derivatives (included in Other Liabilities)		$ 7,789

Derivative Instruments and He65

Derivative Instruments and Hedging Activities - Schedule of Gross Amounts of Derivative Assets and Derivative Liabilities (Detail) - Not Designated as Hedging Instruments [Member] - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Derivative Asset [Abstract]
Gross amounts recognized		$ 11,030	$ 13,203
Gross amounts offset		(17)	(222)
Net amounts presented in the Consolidated Balance Sheets		11,013	12,981
Net Amount		11,013	12,981
Derivative Liability [Abstract]
Gross amounts recognized		11,011	13,175
Gross amounts offset		(17)	(222)
Net amounts presented in the Consolidated Balance Sheets		10,994	12,953
Gross amounts not offset	[1]	(12,489)	(12,059)
Net Amount		$ (1,495)	$ 894
[1]	Amounts represent posted collateral.

Derivative Instruments and He66

Derivative Instruments and Hedging Activities - Amount of Gain or Loss Recognized in Income on Derivatives (Detail) - Not Designated as Hedging Instruments [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives Gain (Loss)	$ 63	$ 124	$ 194	$ 95
Interest Rate Swap Contracts-Commercial Loans [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives Gain (Loss)	(21)	(11)	(8)	(19)
Interest Rate Lock Commitments [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives Gain (Loss)	(8)	199	128	207
Forward Sale Contracts-Mortgage Loans [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives Gain (Loss)	$ 92	$ (64)	$ 74	$ (93)

Borrowings - Additional Informa

Borrowings - Additional Information (Detail) - USD ($)	Jun. 18, 2015	Mar. 05, 2015	Jun. 30, 2015	Jun. 30, 2014	Mar. 04, 2015	Dec. 31, 2014
Long Term And Short Term Debt [Line Items]
Total long-term debt outstanding at a fixed rate			$ 15,000,000
Total long-term debt outstanding at a variable rate			148,800,000
Capital lease			200,000
Repayment of junior subordinated debt			13,500,000	$ 0
Total borrowings			349,000,000			$ 309,300,000
Short-term borrowings			231,000,000
Long-term borrowings			118,000,000
Federal Home Loan Bank Advances [Member]
Long Term And Short Term Debt [Line Items]
Maximum borrowing capacity			1,900,000,000
Remaining borrowing capacity			1,400,000,000
Borrowing capacity utilized			500,000,000
Letter of credit to collateralize public funds			168,500,000
Junior Subordinated Debt [Member]
Long Term And Short Term Debt [Line Items]
Repayment of junior subordinated debt	$ 5,000,000	$ 8,500,000
Borrowings					$ 13,500,000
Mortgage Backed Securities [Member]
Long Term And Short Term Debt [Line Items]
Mortgage backed securities pledged as collateral			$ 50,500,000			$ 35,600,000

Borrowings - Summary of Informa

Borrowings - Summary of Information Pertaining to Borrowings (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Long Term And Short Term Debt [Line Items]
Short-term borrowings	$ 277,210	$ 320,605
Long-term borrowings	163,847	65,061
Total Borrowings	$ 441,057	$ 385,666
Short-term borrowings, Weighted Average Rate	0.28%	0.27%
Long-term borrowings, Weighted Average Rate	1.31%	2.79%
Total Borrowings, Weighted Average Rate	0.66%	0.70%
Securities Sold under Repurchase Agreements [Member]
Long Term And Short Term Debt [Line Items]
Short-term borrowings	$ 46,235	$ 30,605
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	$ 230,975	$ 290,000
Short-term borrowings, Weighted Average Rate	0.33%	0.31%
Other Long-Term Borrowings [Member]
Long Term And Short Term Debt [Line Items]
Long-term borrowings	$ 118,228	$ 19,442
Long-term borrowings, Weighted Average Rate	0.76%	3.00%
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	2.74%	2.70%

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Allowance for unfunded commitments	$ 2.9	$ 2.3

Commitments and Contingencies70

Commitments and Contingencies - Commitments and Letters of Credit (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Other Commitments [Line Items]
Commitments and letters of credit	$ 1,552,329	$ 1,232,212
Commitments to Extend Credit [Member]
Other Commitments [Line Items]
Commitments and letters of credit	1,453,491	1,158,628
Standby Letters of Credit [Member]
Other Commitments [Line Items]
Commitments and letters of credit	$ 98,838	$ 73,584

Other Comprehensive Income (Det

Other Comprehensive Income (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pre-Tax Amount
Change in unrealized (losses)/gains on securities available-for-sale		$ (5,872)	$ 5,401	$ (889)	$ 9,876
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income	[1]	34	(40)	34	(41)
Adjustment to funded status of employee benefit plans		463	211	1,192	423
Other Comprehensive (Loss)/Income		(5,375)	5,572	337	10,258
Tax (Expense) Benefit
Change in unrealized (losses)/ gains on securities available-for-sale		2,056	(1,891)	311	(3,457)
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income	[1]	(12)	15	(12)	15
Adjustment to funded status of employee benefit plans		(162)	(74)	(324)	(148)
Other Comprehensive (Loss)/Income		1,882	(1,950)	(25)	(3,590)
Net of Tax Amount
Change in unrealized (losses)/ gains on securities available-for-sale		(3,816)	3,510	(578)	6,419
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income	[1]	22	(25)	22	(26)
Adjustment to funded status of employee benefit plans		301	137	868	275
Other Comprehensive (Loss)/Income		$ (3,493)	$ 3,622	$ 312	$ 6,668
[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

Employee Benefits - Additional Information (Detail)	Jan. 01, 2015	Jun. 30, 2015
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%
Lump sum death benefit to unmarried beneficiary as percent of accrued benefit payable (percent)	80.00%

Employee Benefits - Components

Employee Benefits - Components of Net Periodic Pension Cost and Other Changes in Plan Assets and Benefit (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Components of Net Periodic Pension Cost
Service cost—benefits earned during the period	$ 672	$ 631	$ 1,344	$ 1,262
Interest cost on projected benefit obligation	1,100	1,106	2,200	2,212
Expected return on plan assets	(1,807)	(1,735)	(3,614)	(3,470)
Amortization of prior service (credit) cost	(35)	(35)	(70)	(70)
Recognized net actuarial loss	468	209	936	418
Net Periodic Pension Expense	$ 398	$ 176	$ 796	$ 352

Segments - Additional Informati

Segments - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2015segment
Segment Reporting [Abstract]
Number of Reportable Segments	3

Segments - Total Assets by Repo

Segments - Total Assets by Reportable Operating Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	$ 6,133,728	$ 4,964,686
Operating Segments [Member] | Community Banking [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	6,121,771	4,954,728
Operating Segments [Member] | Insurance [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	8,232	7,468
Operating Segments [Member] | Wealth Management [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	$ 3,725	$ 2,490

Segments - Financial Informatio

Segments - Financial Information of Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting, Asset Reconciling Item [Line Items]
Interest income	$ 52,611	$ 39,872	$ 96,526	$ 78,537
Interest expense	3,800	3,017	7,456	6,091
NET INTEREST INCOME	48,811	36,855	89,070	72,446
Provision for loan losses	2,059	(1,134)	3,266	(845)
Noninterest income	13,383	11,771	25,467	23,187
Noninterest Expense By Segment	33,634	29,043	65,877	56,821
Depreciation expense	1,299	825	2,329	1,645
Amortization of intangible assets	516	297	864	613
Provision for income taxes	6,498	4,875	11,178	8,646
Net Income	18,188	14,720	31,023	28,753
Operating Segments [Member] | Community Banking [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Interest income	52,598	39,845	96,483	78,475
Interest expense	4,056	3,415	7,944	6,897
NET INTEREST INCOME	48,542	36,430	88,539	71,578
Provision for loan losses	2,059	(1,134)	3,266	(845)
Noninterest income	8,869	7,522	16,406	14,375
Noninterest Expense By Segment	29,916	25,092	58,603	49,066
Depreciation expense	1,279	805	2,290	1,607
Amortization of intangible assets	495	274	822	566
Provision for income taxes	6,139	4,637	10,396	8,002
Net Income	17,523	14,278	29,568	27,557
Operating Segments [Member] | Insurance [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Interest income	1		1
NET INTEREST INCOME	1		1
Noninterest income	1,328	1,245	2,881	2,766
Noninterest Expense By Segment	1,053	1,044	2,190	2,199
Depreciation expense	14	13	26	25
Amortization of intangible assets	13	13	25	25
Provision for income taxes	88	61	224	181
Net Income	161	114	417	336
Operating Segments [Member] | Wealth Management [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Interest income	157	136	298	310
NET INTEREST INCOME	157	136	298	310
Noninterest income	2,917	2,828	5,833	5,764
Noninterest Expense By Segment	2,285	2,442	4,505	4,716
Depreciation expense	6	7	13	13
Amortization of intangible assets	8	10	17	22
Provision for income taxes	271	177	558	463
Net Income	504	328	1,038	860
Eliminations [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Interest income	(145)	(109)	(256)	(248)
Interest expense	(256)	(398)	(488)	(806)
NET INTEREST INCOME	111	289	232	558
Noninterest income	269	176	347	282
Noninterest Expense By Segment	$ 380	$ 465	$ 579	$ 840

Qualified Affordable Housing 77

Qualified Affordable Housing Projects (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Investments in Affordable Housing Projects [Abstract]
Investment in qualified affordable housing projects	$ 16,800,000		$ 16,800,000		$ 18,600,000
Open commitments	0		0		$ 0
Amortization expense included in noninterest expense	900,000	$ 1,000,000	1,900,000	$ 2,000,000
Tax credits	$ 1,000,000	$ 1,100,000	$ 2,000,000	$ 2,200,000