S&T Bancorp (STBA) 10-Q 3 Aug 16 2016 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2016	Jul. 29, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2,016
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		34,916,358

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
ASSETS
Cash and due from banks, including interest-bearing deposits of $40,879 and $41,639 at June 30, 2016 and December 31, 2015	$ 94,991	$ 99,399
Securities available-for-sale, at fair value	683,479	660,963
Loans held for sale	11,999	35,321
Portfolio loans, net of unearned income	5,388,264	5,027,612
Allowance for loan losses	(52,213)	(48,147)
Portfolio loans, net	5,336,051	4,979,465
Bank owned life insurance	70,991	70,175
Premises and equipment, net	47,025	49,127
Federal Home Loan Bank and other restricted stock, at cost	27,755	23,032
Goodwill	291,670	291,764
Other intangible assets, net	5,657	6,525
Other assets	104,587	102,583
Total Assets	6,674,205	6,318,354
LIABILITIES
Noninterest-bearing demand	1,220,568	1,227,766
Interest-bearing demand	662,509	616,188
Money market	700,219	605,184
Savings	1,033,077	1,061,265
Certificates of deposit	1,503,945	1,366,208
Total Deposits	5,120,318	4,876,611
Securities sold under repurchase agreements	48,479	62,086
Short-term borrowings	550,000	356,000
Long-term borrowings	15,888	117,043
Junior subordinated debt securities	45,619	45,619
Other liabilities	68,851	68,758
Total Liabilities	5,849,155	5,526,117
SHAREHOLDERS’ EQUITY
Common stock ($2.50 par value) Authorized—50,000,000 shares Issued—36,130,480 shares at June 30, 2016 and December 31, 2015 Outstanding—34,916,358 shares at June 30, 2016 and 34,810,374 shares at December 31, 2015	90,326	90,326
Additional paid-in capital	211,824	210,545
Retained earnings	561,132	544,228
Accumulated other comprehensive (loss) income	(4,748)	(16,457)
Treasury stock (1,214,122 shares at June 30, 2016 and 1,320,106 shares at December 31, 2015, at cost)	(33,484)	(36,405)
Total Shareholders’ Equity	825,050	792,237
Total Liabilities and Shareholders’ Equity	$ 6,674,205	$ 6,318,354

Consolidated Balance Sheets (U3

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Cash and due from banks, interest-bearing amounts	$ 40,879	$ 41,639
Common stock, par value (in dollars per share)	$ 2.50	$ 2.50
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	36,130,480	36,130,480
Common stock, shares outstanding (in shares)	34,916,358	34,810,374
Treasury stock, shares (in shares)	1,214,122	1,320,106

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
INTEREST INCOME
Loans, including fees	$ 52,019	$ 48,933	$ 103,177	$ 88,859
Investment Securities:
Taxable	2,580	2,394	5,134	4,777
Tax-exempt	915	998	1,857	2,018
Dividends	336	286	702	872
Total Interest Income	55,850	52,611	110,870	96,526
INTEREST EXPENSE
Deposits	5,029	3,051	9,284	6,058
Borrowings and junior subordinated debt securities	1,113	749	2,240	1,398
Total Interest Expense	6,142	3,800	11,524	7,456
NET INTEREST INCOME	49,708	48,811	99,346	89,070
Provision for loan losses	4,848	2,059	9,863	3,266
Net Interest Income After Provision for Loan Losses	44,860	46,752	89,483	85,804
NONINTEREST INCOME
Securities (losses) gains, net	0	(34)	0	(34)
Service charges on deposit accounts	3,065	2,877	6,064	5,459
Debit and credit card fees	2,869	3,020	5,655	5,736
Wealth management fees	2,630	2,930	5,382	5,853
Insurance fees	1,205	1,391	2,979	3,041
Mortgage banking	578	782	1,107	1,308
Gain on sale of credit card portfolio	0	0	2,066	0
Other	2,101	2,417	5,012	4,104
Total Noninterest Income	12,448	13,383	28,265	25,467
NONINTEREST EXPENSE
Salaries and employee benefits	17,626	17,455	38,528	34,235
Data processing	2,723	2,555	4,835	4,876
Net occupancy	2,688	2,682	5,638	5,270
Furniture and equipment	1,719	1,582	3,648	2,808
Marketing	1,075	1,193	1,976	2,009
Professional services and legal	1,047	801	1,994	1,324
FDIC insurance	994	808	1,934	1,503
Other taxes	896	1,159	1,995	2,002
Merger related expenses	0	866	0	3,167
Other	5,985	6,348	12,621	11,876
Total Noninterest Expense	34,753	35,449	73,169	69,070
Income Before Taxes	22,555	24,686	44,579	42,201
Provision for income taxes	5,496	6,498	11,427	11,178
Net Income	$ 17,059	$ 18,188	$ 33,152	$ 31,023
Earnings per share—basic (in dollars per share)	$ 0.49	$ 0.52	$ 0.96	$ 0.94
Earnings per share—diluted (in dollars per share)	0.49	0.52	0.95	0.94
Dividends declared per share (in dollars per share)	$ 0.19	$ 0.18	$ 0.38	$ 0.36
Comprehensive Income	$ 20,427	$ 14,695	$ 44,861	$ 31,335

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive (Loss)/Income	Treasury Stock
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)
Balance at Dec. 31, 2015	792,237	90,326	210,545	544,228	(16,457)	(36,405)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	33,152			33,152
Other comprehensive income (loss), net of tax	11,709				11,709
Cash dividends declared	(13,211)			(13,211)
Treasury stock issued for restricted awards	(116)			(3,037)		2,921
Recognition of restricted stock compensation expense	1,279		1,279
Balance at Jun. 30, 2016	$ 825,050	$ 90,326	$ 211,824	$ 561,132	$ (4,748)	$ (33,484)

Consolidated Statements of Cha6

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Statement of Stockholders' Equity [Abstract]
Dividends declared per share (in dollars per share)	$ 0.38	$ 0.36
Common stock issued in acquisition (in shares)		4,933,115
Treasury stock issued for restricted awards, net of forfeitures (in shares)	110,643	87,841
Forfeitures of restricted stock (in shares)	4,659	4,630

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
OPERATING ACTIVITIES
Net income	$ 33,152	$ 31,023
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	9,863	3,266
Provision for unfunded loan commitments	131	605
Depreciation, amortization and accretion	1,878	388
Net amortization of discounts and premiums on securities	1,861	1,802
Stock-based compensation expense	1,279	769
Securities losses (gains), net	0	34
Tax benefit from stock-based compensation	0	(29)
Mortgage loans originated for sale	(45,831)	(52,075)
Proceeds from the sale of mortgage loans	46,555	42,008
Gain on the sale of mortgage loans, net	(679)	(597)
Gain on the sale of credit card portfolio	(2,066)	0
Pension plan curtailment gain	(1,017)	0
Net increase in interest receivable	(3,485)	(2,542)
Net increase (decrease) in interest payable	1,126	(475)
Net (increase) decrease in other assets	(2,900)	1,854
Net increase (decrease) in other liabilities	4,127	(811)
Net Cash Provided by Operating Activities	43,994	25,220
INVESTING ACTIVITIES
Purchases of securities available-for-sale	(45,431)	(54,754)
Proceeds from maturities, prepayments and calls of securities available-for-sale	34,723	26,096
Proceeds from sales of securities available-for-sale	0	11,119
Net (purchases of) proceeds from Federal Home Loan Bank stock	(4,723)	(334)
Net increase in loans	(369,089)	(141,911)
Proceeds from sale of loans not originated for resale	2,427	0
Purchases of premises and equipment	(1,360)	(2,465)
Proceeds from the sale of premises and equipment	3	27
Proceeds from the sale of credit card portfolio	25,019	0
Net cash paid in excess of cash acquired from bank merger	0	(16,347)
Net Cash Used in Investing Activities	(358,431)	(178,569)
FINANCING ACTIVITIES
Net increase in deposits	105,970	297,340
Net increase (decrease) in certificates of deposit	138,148	(68,397)
Net (decrease) increase in securities sold under repurchase agreements	(13,607)	15,630
Net increase (decrease) in short-term borrowings	194,000	(127,686)
Proceeds from long-term borrowings	0	100,000
Repayments of long-term borrowings	(101,155)	(1,214)
Repayment of junior subordinated debt	0	(13,500)
Treasury shares issued-net	(116)	(111)
Common stock issuance costs	0	(132)
Cash dividends paid to common shareholders	(13,211)	(11,608)
Tax benefit from stock-based compensation	0	29
Net Cash Provided by Financing Activities	310,029	190,351
Net (decrease) increase in cash and cash equivalents	(4,408)	37,002
Cash and cash equivalents at beginning of period	99,399	109,580
Cash and Cash Equivalents at End of Period	94,991	146,582
Supplemental Disclosures
Loans transferred from held for sale to portfolio	(1,540)	0
Interest paid	10,398	7,619
Income taxes paid, net of refunds	13,474	9,275
Net assets acquired from bank merger, excluding cash and cash equivalents	0	43,433
Transfers of loans to other real estate owned	$ 231	$ 137

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2016
Accounting Policies [Abstract]
Basis of Presentation	BASIS OF PRESENTATION Principles of Consolidation The interim Consolidated Financial Statements include the accounts of S&T Bancorp, Inc., or S&T, and its wholly owned subsidiaries. All significant intercompany transactions have been eliminated in consolidation. Investments of 20 percent to 50 percent of the outstanding common stock of investees are accounted for using the equity method of accounting. Basis of Presentation The accompanying unaudited interim Consolidated Financial Statements of S&T have been prepared in accordance with generally accepted accounting principles, or GAAP, in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our annual report on Form 10-K for the year ended December 31, 2015 , filed with the Securities and Exchange Commission, or SEC, on February 23, 2016. 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 A mounts in prior period financial statements and footnotes are reclassified whenever necessary to conform to the current period presentation. Reclassifications had no 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 Business Combinations - Simplifying the Accounting for Measurement Period Adjustments In September 2015, the Financial Accounting Standards Board, or FASB, issued ASU No. 2015-16, Business Combinations - Simplifying the Accounting for Measurement Period Adjustments (Topic 805); The amendments in this ASU No. 2015-16 eliminate the requirement to retrospectively adjust the financial statements for measurement-period adjustments as if they were known at the acquisition date, but are recognized in the reporting period in which they are determined. Additional disclosures are required about the impact on current-period income statement line items of adjustments that would have been recognized in prior periods if that information had been revised. The measurement period is a reasonable time period after the acquisition date when the acquirer may adjust the provisional amounts recognized for a business combination if the necessary information is not available by the end of the reporting period in which the acquisition occurs. The measurement periods cannot continue for more than one year from the acquisition date. The standard is effective for annual periods and interim periods beginning after December 15, 2015. The adoption of this ASU had no impact on our results of operations or financial position. 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 No. 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. The adoption of this ASU had no 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, 2015. In September 2015, the FASB issued ASU No. 2015-15, Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements. ASU No. 2015-15 amends the SEC Content in Subtopic 835-30 by adding SEC paragraph 835-30-S35-1, Interest-Imputation of Interest Subsequent Measurement and paragraph 830-30-S45-1, Other Presentation Matters. These paragraphs were added because ASU No. 2015-03 issued in April 2015 does not address presentation or subsequent measurement of debt issuance costs related to "line-of-credit arrangements." The adoption of this ASU had no material impact on our results of operations or financial position. Consolidation: Amendments to the Consolidation Analysis In February 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, or 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; and 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. The adoption of this ASU had no 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 No. 2015-01 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. The adoption of this ASU had no impact on our results of operations or financial position. Recently Issued Accounting Standards Updates not yet Adopted Financial Instruments - Credit Losses In June 2016, the FASB issued ASU No. 2016-13, Measurement of Credit Losses on Financial Instruments. The main objective of this ASU is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The amendments of this update replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The collective changes to the recognition and measurement accounting standards for financial instruments and their anticipated impact on the allowance for credit losses modeling have been universally referred to as the CECL, or current expected credit loss, model. This Update is effective for interim and annual reporting periods in fiscal years beginning after December 15, 2019. Early adoption is permitted as of the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. We are evaluating the provisions of this ASU to determine the potential impact on our results of operations and financial position. Revenue from Contracts with Customers In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date. This ASU defers the effective date of ASU No. 2014-09 for all entities by one year. The new revenue pronouncement creates a single source of revenue guidance for all companies in all industries and is more principles-based than current revenue guidance. The pronouncement provides a five-step model for a company to recognize revenue when it transfers control of goods or services to customers at an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. The five steps are: 1. identify the contract with the customer; 2. identify the separate performance obligations in the contract; 3. determine the transaction price; 4. allocate the transaction price to the separate performance obligations; and 5. recognize revenue when each performance obligation is satisfied. The Update is effective for interim and annual reporting periods in fiscal years beginning after December 15, 2017. Early adoption is permitted as of the original effective date for interim and annual reporting periods in fiscal years beginning after December 15, 2016. In March 2016, the FASB issued ASU No. 2016-08, Principal versus Agent Considerations (Reporting Revenue Gross versus Net), as an amendment to ASU No. 2014-09 to improve Topic 606, Revenue from Contracts with Customers by reducing: 1. The potential for diversity in practice arising from inconsistent and application of the principal versus agent guidance, and 2. The cost and complexity of applying Topic 606 both at transition and on an ongoing basis. The effective date and transition requirements for the amendments in both of these Updates are the same as the effective date and transition requirements in Topic 606 (and any other Topic amended by Update 2014-09). ASU 2015-14. In April 2016, the FASB issued ASU No. 2016-10, Identifying Performance Obligations and Licensing, as an amendment to ASU No. 2014-09 to improve Topic 606, Revenue from Contracts with Customers, by reducing: 1. The potential for diversity in practice at initial application, and 2. The cost and complexity of applying Topic 606 both at transition and on an ongoing basis. In May 2016, the FASB issued ASU No. 2016-12, Narrow-scope Improvements and Practical Expedients. The amendments in this ASU do not change the core principles of Topic 606, Revenue from Contracts with Customers. These amendments affect only the narrow aspects of Topic 606: 1. Collectibility Criterion, 2. Presentation of Sales Taxes and Other Similar Taxes Collected from Customers, 3. Noncash Consideration, 4. Contract Modifications at Transition, and 5. Completed Contracts at Transition. We are evaluating the provisions of these ASUs to determine the potential impact to our results of operations and financial position. Stock Compensation - Improvements to Employee Share-Based Payment Accounting On March 31, 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting, which is intended to improve the accounting for share-based payment transactions as part of the FASB's simplification initiative. The ASU changes seven aspects of the accounting for share-based payment award transactions, including; 1. accounting for income taxes; 2. classification of excess tax benefits on the statement of cash flows; 3. forfeitures; 4. minimum statutory tax withholding requirements; 5. classification of employee taxes paid on the statement of cash flows when an employer withholds shares for tax-withholding purposes; 6. practical expedient -- expected term (nonpublic only); and 7. intrinsic value (nonpublic only). This ASU is effective for fiscal years beginning after December 15, 2016 and interim periods within those years for public business entities. Early adoption is permitted in any interim or annual period provided that the entire ASU is adopted. We do not expect that this ASU will have a material impact on our results of operations and financial position. Equity Method and Joint Ventures - Simplifying the Transition to the Equity Method of Accounting In March 2016, the FASB issued ASU No. 2016-07, Simplifying the Transition to the Equity Method of Accounting, which eliminates the requirement for an investor to retroactively apply the equity method when its increase in ownership interest (or degree of influence) in an investee triggers equity method accounting. This ASU is effective for annual and interim periods in fiscal years beginning after December 15, 2016. The amendments should be applied prospectively upon their effective date to increases in the level of ownership interest or degree of influence that result in the adoption of the equity method. Earlier application is permitted. We do not expect that this ASU will have a material impact on our results of operations and financial position. Leases - Section A-Amendments to the FASB Accounting Standards Codification, Section B-Conforming Amendments Related to Leases and Section C-Background Information and Basis for Conclusions In February 2016, the FASB issued ASU No. 2016-02, Leases, which, requires lessees to recognize a right-to-use asset and a lease obligation for all leases on the balance sheet. Lessor accounting remains substantially similar to current GAAP. ASU 2016-02 supersedes Topic 840, Leases. This ASU is effective for annual and interim periods in fiscal years beginning after December 15, 2018. ASU 2016-02 mandates a modified retrospective transition method for all entities. Early adoption of this ASU is permitted. We anticipate that this ASU will impact our financial statements as it relates to the recognition of right-to-use assets and lease obligations on our Consolidated Balance Sheet. However, we do not expect that this ASU will have a material impact on our Consolidated Statement of Comprehensive Income. Accounting for Financial Instruments - Overall: Classification and Measurement In January 2016, the FASB issued ASU No. 2016-01, Accounting for Financial Instruments - Overall: Classification and Measurement (Subtopic 825-10). The amendments in this ASU No. 2016-01 address the following: 1. require equity investments to be measured at fair value with changes in fair value recognized in net income; 2. simplify the impairment assessment of equity investments without readily-determinable fair values by requiring a qualitative assessment to identify impairment; 3. eliminate the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; 4. require entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; 5. require separate presentation in other comprehensive income for the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; 6. require separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (that is, securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; and 7. clarify that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity's other deferred tax assets. We anticipate that this ASU will have a significant impact on our financial statements and disclosures primarily as it relates to recognizing the fair value changes for equity securities in net income rather than an adjustment to equity through other comprehensive income.

Business Combinations

Business Combinations	6 Months Ended
	Jun. 30, 2016
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 the 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. Purchase accounting guidance allows for a reasonable period of time following an acquisition for the acquirer to obtain the information necessary to complete the accounting for a business combination. This period is known as the measurement period. At the end of the measurement period, $1.1 million in purchase accounting adjustments were recognized that increased goodwill. The measurement period adjustments primarily related to changes to provisional amounts, a $0.8 million reduction in the fair value of land and $0.3 million in deferred taxes. Goodwill of $115.9 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 from the Merger: (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 19,088 Total Assets Acquired 864,982 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 56,129 Goodwill $ 115,850 Loans acquired in the Merger were recorded at fair value with no carryover of the related Allowance for Loan Losses, or ALL. 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. The fair value of the loans acquired was $788.7 million net of a $14.8 million discount. The discount is accreted to interest income over the remaining contractual life of the loans. At March 4, 2015, 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. No merger related expenses were recognized during the three months and six months ended June 30, 2016. For the three months ended June 30, 2015, we recognized $0.9 million of merger related expenses, including $0.4 million for data processing contract termination and conversion costs, $0.1 million in severance payments, $0.1 million in legal and professional expenses and $0.3 million in other expenses. 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.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE The following table reconciles the numerators and denominators of basic and 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) 2016 2015 2016 2015 Numerator for Earnings per Share—Basic: Net income $ 17,059 $ 18,188 $ 33,152 $ 31,023 Less: Income allocated to participating shares 60 79 101 123 Net Income Allocated to Shareholders $ 16,999 $ 18,109 $ 33,051 $ 30,900 Numerator for Earnings per Share—Diluted: Net income $ 17,059 $ 18,188 $ 33,152 $ 31,023 Net Income Available to Shareholders $ 17,059 $ 18,188 $ 33,152 $ 31,023 Denominators for Earnings per Share: Weighted Average Shares Outstanding—Basic 34,674,712 34,652,895 34,666,773 32,951,936 Add: Potentially dilutive shares 89,853 28,283 80,890 36,359 Denominator for Treasury Stock Method—Diluted 34,764,565 34,681,178 34,747,663 32,988,295 Weighted Average Shares Outstanding—Basic 34,674,712 34,652,895 34,666,773 32,951,936 Add: Average participating shares outstanding 122,160 151,134 105,794 131,563 Denominator for Two-Class Method—Diluted 34,796,872 34,804,029 34,772,567 33,083,499 Earnings per share—basic $ 0.49 $ 0.52 $ 0.96 $ 0.94 Earnings per share—diluted $ 0.49 $ 0.52 $ 0.95 $ 0.94 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 - expired in December 2015 — 155,500 — 155,500 Restricted stock considered anti-dilutive excluded from potentially dilutive shares 144,998 122,851 117,796 95,204

Fair Value Measurement

Fair Value Measurement	6 Months Ended
	Jun. 30, 2016
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 derivative financial instruments 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, and other repossessed assets, 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 estimates of assumptions that market participants would use in pricing an asset or liability, which are developed based on the best information available in the circumstances. The fair value hierarchy gives the highest priority to unadjusted quoted market prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The fair value hierarchy is broken down into three levels based on the reliability of inputs as follows: Level 1: valuation is based upon unadjusted quoted market prices for identical instruments traded in active markets. Level 2: valuation is based upon quoted market prices for similar instruments traded in active markets, quoted market prices for identical or similar instruments traded in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by market data. Level 3: valuation is derived from other valuation methodologies, including discounted cash flow models and similar techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in determining fair value. A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Our policy is to recognize transfers between any of the fair value hierarchy levels at the end of the reporting period in which the transfer occurred. The following are descriptions of the valuation methodologies that we use for financial instruments recorded at fair value on either a recurring or nonrecurring basis. Recurring Basis Securities Available-for-Sale Securities available-for-sale include both debt and equity securities. We obtain fair values for debt securities from a third-party pricing service which utilizes several sources for valuing fixed-income securities. We validate prices received from our pricing service through comparison to a secondary pricing service and broker quotes. We review the methodologies of the pricing service which provides us with a sufficient understanding of the valuation models, assumptions, inputs and pricing to reasonably measure the fair value of our debt securities. The market evaluation 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 and any applicable credit enhancements and collateral postings. Nonrecurring Basis Loans Held for Sale Loans held for sale consist of 1-4 family residential loans originated for sale in the secondary market and, from time to time, certain loans transferred from the loan portfolio to loans held for sale, all of which are carried at the lower of cost or fair value. The fair value of 1-4 family residential loans is based on the principal or most advantageous market currently offered for similar loans using observable market data. The fair value of the loans transferred from the loan portfolio is based on the amounts offered for these loans in currently pending sales transactions. Loans held for sale carried at fair value are classified as Level 3. Impaired Loans Impaired loans are carried at the lower of carrying value or fair value. Fair value is determined as the recorded investment balance less any specific reserve. We establish specific reserves 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. Other Assets We measure certain other assets at fair value on a nonrecurring basis. Fair value is based on the application of lower of cost or fair value accounting, or write-downs of individual assets. Valuation methodologies used to measure fair value are consistent with overall principles of fair value accounting and consistent with those described above. Financial Instruments In addition to financial instruments recorded at fair value in our financial statements, fair value accounting guidance requires disclosure of the fair value of all of an entity’s assets and liabilities that are considered financial instruments. The majority of our assets and liabilities are considered financial instruments. Many of these instruments lack an available trading market as characterized by a willing buyer and willing seller engaged in an exchange transaction. Also, it is our general practice and intent to hold our financial instruments to maturity and to not engage in trading or sales activities with respect to such financial instruments. For fair value disclosure purposes, we substantially utilize the fair value measurement criteria as required and explained above. In cases where quoted fair values are not available, we use present value methods to determine the fair value of our financial instruments. Cash and Cash Equivalents 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 nonperforming loans is the carrying value less any specific reserve on the loan if it is impaired. 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; 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, or REPOs, 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 carrying values approximate their fair 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. Assets and Liabilities Recorded at Fair Value on a 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, 2016 and December 31, 2015 . There were no transfers between Level 1 and Level 2 for items measured at fair value on a recurring basis during the periods presented. June 30, 2016 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Securities available-for-sale: U.S. Treasury securities $ — $ 15,103 $ — $ 15,103 Obligations of U.S. government corporations and agencies — 262,265 — 262,265 Collateralized mortgage obligations of U.S. government corporations and agencies — 143,262 — 143,262 Residential mortgage-backed securities of U.S. government corporations and agencies — 38,014 — 38,014 Commercial mortgage-backed securities of U.S. government corporations and agencies — 81,668 — 81,668 Obligations of states and political subdivisions — 134,250 — 134,250 Marketable equity securities — 8,917 — 8,917 Total securities available-for-sale — 683,479 — 683,479 Trading securities held in a Rabbi Trust 4,196 — — 4,196 Total securities 4,196 683,479 — 687,675 Derivative financial assets: Interest rate swap contracts - commercial loans — 16,926 — 16,926 Interest rate lock commitments - mortgage loans — 643 — 643 Total Assets $ 4,196 $ 701,048 $ — $ 705,244 LIABILITIES Derivative financial liabilities: Interest rate swap contracts - commercial loans $ — $ 16,786 $ — $ 16,786 Forward sale contracts - mortgage loans — 204 — 204 Total Liabilities $ — $ 16,990 $ — $ 16,990 December 31, 2015 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Securities available-for-sale: U.S. Treasury securities $ — $ 14,941 $ — $ 14,941 Obligations of U.S. government corporations and agencies — 263,303 — 263,303 Collateralized mortgage obligations of U.S. government corporations and agencies — 128,835 — 128,835 Residential mortgage-backed securities of U.S. government corporations and agencies — 40,125 — 40,125 Commercial mortgage-backed securities of U.S. government corporations and agencies — 69,204 — 69,204 Obligations of states and political subdivisions — 134,886 — 134,886 Marketable equity securities — 9,669 — 9,669 Total securities available-for-sale — 660,963 — 660,963 Trading securities held in a Rabbi Trust 4,021 — — 4,021 Total securities 4,021 660,963 — 664,984 Derivative financial assets: Interest rate swap contracts - commercial loans — 11,295 — 11,295 Interest rate lock commitments - mortgage loans — 261 — 261 Total Assets $ 4,021 $ 672,519 $ — $ 676,540 LIABILITIES Derivative financial liabilities: Interest rate swap contracts - commercial loans $ — $ 11,276 $ — $ 11,276 Forward sale contracts - mortgage loans — 5 — 5 Total Liabilities $ — $ 11,281 $ — $ 11,281 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. There were no liabilities measured at fair value on a nonrecurring basis at either June 30, 2016 or December 31, 2015 . The following table presents our assets that are measured at fair value on a nonrecurring basis by the fair value hierarchy level as of the dates presented: June 30, 2016 December 31, 2015 (dollars in thousands) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total ASSETS (1) Impaired loans — — 14,343 14,343 — — 9,373 9,373 Other real estate owned — — 149 149 — — 158 158 Mortgage servicing rights — — 3,094 3,094 — — 3,396 3,396 Total Assets $ — $ — $ 17,586 $ 17,586 $ — $ — $ 12,927 $ 12,927 (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, 2016 and December 31, 2015 are presented in the following tables: Carrying Value (1) Fair Value Measurements at June 30, 2016 (dollars in thousands) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 94,991 $ 94,991 $ 94,991 $ — $ — Securities available-for-sale 683,479 683,479 — 683,479 — Loans held for sale 11,999 12,485 — — 12,485 Portfolio loans, net of unearned income 5,388,264 5,380,012 — — 5,380,012 Bank owned life insurance 70,991 70,991 — 70,991 — FHLB and other restricted stock 27,755 27,755 — — 27,755 Trading securities held in a Rabbi Trust 4,196 4,196 4,196 — — Mortgage servicing rights 3,094 3,094 — — 3,094 Interest rate swap contracts - commercial loans 16,926 16,926 — 16,926 — Interest rate lock commitments - mortgage loans 643 643 — 643 — LIABILITIES Deposits $ 5,120,318 $ 5,127,474 $ — $ — $ 5,127,474 Securities sold under repurchase agreements 48,479 48,479 — — 48,479 Short-term borrowings 550,000 550,000 — — 550,000 Long-term borrowings 15,888 16,843 — — 16,843 Junior subordinated debt securities 45,619 45,619 — — 45,619 Interest rate swap contracts - commercial loans 16,786 16,786 — 16,786 — Forward sale contracts - mortgage loans 204 204 — 204 — (1) As reported in the Consolidated Balance Sheets Carrying Value (1) Fair Value Measurements at December 31, 2015 (dollars in thousands) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 99,399 $ 99,399 $ 99,399 $ — $ — Securities available-for-sale 660,963 660,963 — 660,963 — Loans held for sale 35,321 35,500 — — 35,500 Portfolio loans, net of unearned income 5,027,612 5,001,004 — — 5,001,004 Bank owned life insurance 70,175 70,175 — 70,175 — FHLB and other restricted stock 23,032 23,032 — — 23,032 Trading securities held in a Rabbi Trust 4,021 4,021 4,021 — — Mortgage servicing rights 3,237 3,396 — — 3,396 Interest rate swap contracts - commercial loans 11,295 11,295 — 11,295 — Interest rate lock commitments - mortgage loans 261 261 — 261 — LIABILITIES Deposits $ 4,876,611 $ 4,881,718 $ — $ — $ 4,881,718 Securities sold under repurchase agreements 62,086 62,086 — — 62,086 Short-term borrowings 356,000 356,000 — — 356,000 Long-term borrowings 117,043 117,859 — — 117,859 Junior subordinated debt securities 45,619 45,619 — — 45,619 Interest rate swap contracts - commercial loans 11,276 11,276 — 11,276 — Forward sale contracts - mortgage loans 5 5 — 5 — (1) As reported in the Consolidated Balance Sheets

Securities Available-for-Sale

Securities Available-for-Sale	6 Months Ended
	Jun. 30, 2016
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, 2016 December 31, 2015 (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 $ 14,934 $ 169 $ — $ 15,103 $ 14,914 $ 27 $ — $ 14,941 Obligations of U.S. government corporations and agencies 256,526 5,739 — 262,265 262,045 1,825 (567 ) 263,303 Collateralized mortgage obligations of U.S. government corporations and agencies 139,532 3,730 — 143,262 128,458 693 (316 ) 128,835 Residential mortgage-backed securities of U.S. government corporations and agencies 36,396 1,618 — 38,014 39,185 1,091 (151 ) 40,125 Commercial mortgage-backed securities of U.S. government corporations and agencies 79,517 2,151 — 81,668 69,697 183 (676 ) 69,204 Obligations of states and political subdivisions 125,145 9,105 — 134,250 128,904 5,988 (6 ) 134,886 Debt Securities 652,050 22,512 — 674,562 643,203 9,807 (1,716 ) 651,294 Marketable equity securities 7,579 1,339 (1 ) 8,917 7,579 2,090 — 9,669 Total $ 659,629 $ 23,851 $ (1 ) $ 683,479 $ 650,782 $ 11,897 $ (1,716 ) $ 660,963 The following tables present the fair value and the age of gross unrealized losses by investment category as of the dates presented: June 30, 2016 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 U.S. Treasury securities — $ — $ — — $ — $ — — $ — $ — Obligations of U.S. government corporations and agencies — — — — — — — — — Collateralized mortgage obligations of U.S. government corporations and agencies — — — — — — — — — Residential mortgage-backed securities of U.S. government corporations and agencies — — — — — — — — — Commercial mortgage-backed securities of U.S. government corporations and agencies — — — — — — — — — Obligations of states and political subdivisions — — — — — — — — — Debt Securities — — — — — — — — — Marketable equity securities 1 70 (1 ) — — — 1 70 (1 ) Total Temporarily Impaired Securities 1 $ 70 $ (1 ) — $ — $ — 1 $ 70 $ (1 ) December 31, 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 U.S. Treasury securities — $ — $ — — $ — $ — — $ — $ — Obligations of U.S. government corporations and agencies 10 88,584 (379 ) 2 14,542 (188 ) 12 103,126 (567 ) Collateralized mortgage obligations of U.S. government corporations and agencies 6 61,211 (316 ) — — — 6 61,211 (316 ) Residential mortgage-backed securities of U.S. government corporations and agencies 1 7,993 (151 ) — — — 1 7,993 (151 ) Commercial mortgage-backed securities of U.S. government corporations and agencies 5 50,839 (450 ) 1 9,472 (226 ) 6 60,311 (676 ) Obligations of states and political subdivisions 1 5,370 (6 ) — — — 1 5,370 (6 ) Debt Securities 23 213,997 (1,302 ) 3 24,014 (414 ) 26 238,011 (1,716 ) Marketable equity securities — — — — — — — — — Total Temporarily Impaired Securities 23 $ 213,997 $ (1,302 ) 3 $ 24,014 $ (414 ) 26 $ 238,011 $ (1,716 ) As of June 30, 2016 , there were no unrealized losses on debt 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 was one marketable equity security with an unrealized loss at June 30, 2016 , and there were no marketable equity unrealized losses at December 31, 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 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, 2016 December 31, 2015 (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 $ 23,851 $ (1 ) $ 23,850 $ 11,897 $ (1,716 ) $ 10,181 Income tax expense/(benefit) 8,347 — 8,347 4,164 (601 ) 3,563 Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss) $ 15,504 $ (1 ) $ 15,503 $ 7,733 $ (1,115 ) $ 6,618 The amortized cost and fair value of securities available-for-sale at June 30, 2016 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, 2016 (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 $ 46,370 $ 46,509 Due after one year through five years 211,742 217,558 Due after five years through ten years 66,087 69,318 Due after ten years 72,406 78,233 396,605 411,618 Collateralized mortgage obligations of U.S. government corporations and agencies 139,532 143,262 Residential mortgage-backed securities of U.S. government corporations and agencies 36,396 38,014 Commercial mortgage-backed securities of U.S. government corporations and agencies 79,517 81,668 Debt Securities 652,050 674,562 Marketable equity securities 7,579 8,917 Total $ 659,629 $ 683,479 At June 30, 2016 and December 31, 2015 , securities with carrying values of $ 252.5 million and $278.4 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, 2016
Receivables [Abstract]
Loans and Loans Held for Sale	Loans are presented net of unearned income of $4.5 million and $3.2 million at June 30, 2016 and December 31, 2015 and net of a discount related to purchase accounting fair value adjustments of $9.0 million and $10.9 million at June 30, 2016 and December 31, 2015 . The following table indicates the composition of the acquired and originated loans as of the dates presented: (dollars in thousands) June 30, 2016 December 31, 2015 Commercial Commercial real estate $ 2,388,786 $ 2,166,603 Commercial and industrial 1,385,746 1,256,830 Commercial construction 398,122 413,444 Total Commercial Loans 4,172,654 3,836,877 Consumer Residential mortgage 671,665 639,372 Home equity 480,204 470,845 Installment and other consumer 58,139 73,939 Consumer construction 5,602 6,579 Total Consumer Loans 1,215,610 1,190,735 Total Portfolio Loans 5,388,264 5,027,612 Loans held for sale 11,999 35,321 Total Loans $ 5,400,263 $ 5,062,933 We attempt to limit our exposure to credit risk by diversifying our loan portfolio by segment, geography, collateral and industry and actively managing concentrations. When concentrations exist in certain segments, we monitor this risk by reviewing the relevant economic indicators and internal risk rating trends and through stress testing of the loans in these segments. Total commercial loans represented 77 percent of total portfolio loans at June 30, 2016 and 76 percent of total portfolio loans at December 31, 2015 . Within our commercial portfolio, the CRE and Commercial Construction portfolios combined comprised $2.8 billion or 67 percent of total commercial loans and 52 percent of total portfolio loans at June 30, 2016 and 67 percent of total commercial loans and 51 percent of total portfolio loans at December 31, 2015 . Further segmentation of the CRE and Commercial Construction portfolios by collateral type reveal no concentration in excess of seven percent of total loans at June 30, 2016 and December 31, 2015 . 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. Our CRE and Commercial Construction portfolios have out-of-market exposure of 5.3 percent of the combined portfolio and 2.7 percent of total loans at June 30, 2016 and 5.8 percent of the combined portfolio and 3.0 percent of total loans at December 31, 2015 . The decrease in loans held for sale of $23.3 million primarily related to the sale of our credit card portfolio of $22.9 million and resulted in a $2.1 million gain for the six months ended June 30, 2016 . 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. We strive to identify borrowers with financial difficulty early and work with them to come to a mutual resolution to modify the terms of their loan before the loan goes nonaccrual. 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, 2016 December 31, 2015 (dollars in thousands) Performing TDRs Nonperforming TDRs Total TDRs Performing TDRs Nonperforming TDRs Total TDRs Commercial real estate $ 4,263 $ 4,369 $ 8,632 $ 6,822 $ 3,548 $ 10,370 Commercial and industrial 6,241 2,535 8,776 6,321 1,570 7,891 Commercial construction 4,351 2,820 7,171 5,013 1,265 6,278 Residential mortgage 2,493 4,411 6,904 2,590 665 3,255 Home equity 3,225 882 4,107 3,184 523 3,707 Installment and other consumer 25 11 36 25 88 113 Total $ 20,598 $ 15,028 $ 35,626 $ 23,955 $ 7,659 $ 31,614 There were no TDRs returned to accruing status during the three and six months ended June 30, 2016 and there were six TDRs that returned to accruing status totaling $0.3 million during the three and six months ended June 30, 2015 . The following tables present the restructured loans during the periods presented: Three Months Ended June 30, 2016 Three Months Ended June 30, 2015 (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 $ 4,721 $ 2,270 $ (2,451 ) — $ — $ — $ — Commercial and industrial Principal deferral 5 985 985 — — — — — Principal forgiveness — — — — 1 400 400 — Maturity date extension 1 130 130 — — — — — Commercial Construction Maturity date extension 4 1,324 1,269 (55 ) — — — — Residential mortgage Principal deferral 1 3,273 3,273 — — — — — Chapter 7 bankruptcy (2) 1 65 64 (1 ) — — — — Maturity date extension and interest rate reduction — — — — 2 225 225 — Home equity Chapter 7 bankruptcy (2) 4 73 69 (4 ) 4 171 171 — Maturity date extension 3 120 120 — — — — — Installment and other consumer Chapter 7 bankruptcy (2) 2 16 13 (3 ) — — — — Total by Concession Type Principal forgiveness — $ — $ — $ — 1 $ 400 $ 400 $ — Principal deferral 7 8,979 6,528 (2,451 ) — — — — Chapter 7 bankruptcy (2) 7 154 146 (8 ) 4 171 171 — Interest rate reduction — — — — — — — — Maturity date extension and interest rate reduction — — — — 2 225 225 — Maturity date extension 8 1,574 1,519 (55 ) — — — — Total 22 $ 10,707 $ 8,193 $ (2,514 ) 7 $ 796 $ 796 $ — (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, 2016 Six Months Ended June 30, 2015 (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 1 $ 4,721 $ 2,270 $ (2,451 ) 2 $ 2,851 $ 2,851 $ — Chapter 7 bankruptcy(2) 1 709 681 (28 ) — — — — Commercial and industrial Principal forgiveness — — — — 1 400 400 — Principal deferral 5 985 985 — 6 661 661 — Chapter 7 bankruptcy (2) — — — — 1 3 1 (2 ) Maturity date extension 3 755 728 (27 ) 1 780 765 (15 ) Commercial Construction Principal deferral — — — — 1 104 103 (1 ) Maturity date extension 5 1,357 1,303 (54 ) — — — — Residential mortgage Principal deferral 1 3,273 3,273 — — — — — Chapter 7 bankruptcy (2) 4 285 280 (5 ) — — — — Maturity date extension 1 483 483 — — — — — Maturity date extension and interest rate reduction — — — — 2 225 225 — Home equity Principal deferral 1 47 46 (1 ) — — — — Chapter 7 bankruptcy (2) 9 318 309 (9 ) 12 313 304 (9 ) Maturity date extension and interest rate reduction 1 130 128 (2 ) — — — — Maturity date extension 4 274 272 (2 ) 1 71 71 — Installment and other consumer Chapter 7 bankruptcy (2) 2 16 13 $ (3 ) — — — $ — Total by Concession Type Principal forgiveness — $ — $ — $ — 1 $ 400 $ 400 $ — Principal deferral 8 9,026 6,574 (2,452 ) 9 3,616 3,615 (1 ) Chapter 7 bankruptcy (2) 16 1,328 1,283 (45 ) 13 316 305 (11 ) Interest rate reduction — — — — — Maturity date extension and interest rate reduction 1 130 128 (2 ) 2 225 225 — Maturity date extension 13 2,869 2,786 (83 ) 2 851 836 (15 ) Total 38 $ 13,353 $ 10,771 $ (2,582 ) 27 $ 5,408 $ 5,381 $ (27 ) (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, 2016 , we modified one C&I loan totaling $6.5 million and one CRE loan totaling $ 0.5 million that were not considered to be TDRs. For the six months ended June 30, 2016, we modified three C&I loans totaling $8.7 million and one CRE loan totaling $0.5 million . The modifications were administrative extensions of maturity dates that were determined not to be a concession. As of June 30, 2016 , we have $0.7 million of commitments to lend additional funds on 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 June 30, Six Months Ended June 30, 2016 2015 2016 2015 (dollars in thousands) Number of Defaults Recorded Investment Number of Defaults Recorded Investment Number of Recorded Number of Recorded Commercial real estate — $ — — $ — — $ — — $ — Commercial and Industrial — — — — — — — — Commercial construction — — — — 1 605 — — Residential mortgage — — — — — — 1 183 Home equity — — 2 119 — — 3 124 Installment and other consumer — — — — — — — — Consumer construction — — — — — — — — Total — $ — 2 $ 119 1 $ 605 4 $ 307 The following table is a summary of nonperforming assets as of the dates presented: Nonperforming Assets (dollars in thousands) June 30, 2016 December 31, 2015 Nonperforming Assets Nonaccrual loans $ 27,877 $ 27,723 Nonaccrual TDRs 15,028 7,659 Total nonaccrual loans 42,905 35,382 OREO 328 354 Total Nonperforming Assets $ 43,233 $ 35,736

Allowance for Loan Losses

Allowance for Loan Losses	6 Months Ended
	Jun. 30, 2016
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 does 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 residential mortgages, 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. 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 the dates presented: June 30, 2016 (dollars in thousands) Current 30-59 Days Past Due 60-89 Days Past Due Nonaccrual Total Past Due Total Loans Commercial real estate $ 2,367,849 $ 7,384 $ 2,666 $ 10,887 $ 20,937 $ 2,388,786 Commercial and industrial 1,366,728 7,276 400 11,342 19,018 1,385,746 Commercial construction 382,985 5,644 1,311 8,182 15,137 398,122 Residential mortgage 657,352 1,191 3,839 9,283 14,313 671,665 Home equity 472,085 4,223 728 3,168 8,119 480,204 Installment and other consumer 57,916 153 27 43 223 58,139 Consumer construction 5,602 — — — — 5,602 Loans held for sale 11,999 — — — — 11,999 Total $ 5,322,516 $ 25,871 $ 8,971 $ 42,905 $ 77,747 $ 5,400,263 December 31, 2015 (dollars in thousands) Current 30-59 Days Past Due 60-89 Days Past Due Nonaccrual Total Past Due Total Loans Commercial real estate $ 2,145,655 $ 11,602 $ 627 $ 8,719 $ 20,948 $ 2,166,603 Commercial and industrial 1,244,802 2,453 296 9,279 12,028 1,256,830 Commercial construction 401,084 3,517 90 8,753 12,360 413,444 Residential mortgage 631,085 1,728 930 5,629 8,287 639,372 Home equity 465,055 2,365 523 2,902 5,790 470,845 Installment and other consumer 73,486 242 111 100 453 73,939 Consumer construction 6,579 — — — — 6,579 Loans held for sale 35,179 94 48 — 142 35,321 Total $ 5,002,925 $ 22,001 $ 2,625 $ 35,382 $ 60,008 $ 5,062,933 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, 2016 (dollars in thousands) Commercial Real Estate % of Total Commercial and Industrial % of Total Commercial Construction % of Total Total % of Total Pass $ 2,314,317 96.9 % $ 1,302,427 94.0 % $ 361,494 90.8 % $ 3,978,238 95.3 % Special mention 22,277 0.9 % 31,865 2.3 % 20,228 5.1 % 74,370 1.8 % Substandard 52,192 2.2 % 51,454 3.7 % 16,400 4.1 % 120,046 2.9 % Total $ 2,388,786 100.0 % $ 1,385,746 100.0 % $ 398,122 100.0 % $ 4,172,654 100.0 % December 31, 2015 (dollars in thousands) Commercial Real Estate % of Total Commercial and Industrial % of Total Commercial Construction % of Total Total % of Total Pass $ 2,094,851 96.7 % $ 1,182,685 94.1 % $ 375,808 90.9 % $ 3,653,344 95.2 % Special mention 19,938 0.9 % 43,896 3.5 % 19,846 4.8 % 83,680 2.2 % Substandard 51,814 2.4 % 30,249 2.4 % 17,790 4.3 % 99,853 2.6 % Total $ 2,166,603 100.0 % $ 1,256,830 100.0 % $ 413,444 100.0 % $ 3,836,877 100.0 % 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, 2016 (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 $ 662,382 98.6 % $ 477,036 99.3 % $ 58,096 99.9 % $ 5,602 100.0 % $ 1,203,116 99.0 % Nonperforming 9,283 1.4 % 3,168 0.7 % 43 0.1 % — — % 12,494 1.0 % Total $ 671,665 100.0 % $ 480,204 100.0 % $ 58,139 100.0 % $ 5,602 100.0 % $ 1,215,610 100.0 % December 31, 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 $ 633,743 99.1 % $ 467,943 99.4 % $ 73,839 99.8 % $ 6,579 100.0 % $ 1,182,104 99.3 % Nonperforming 5,629 0.9 % 2,902 0.6 % 100 0.2 % — — % 8,631 0.7 % Total $ 639,372 100.0 % $ 470,845 100.0 % $ 73,939 100.0 % $ 6,579 100.0 % $ 1,190,735 100.0 % 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 related information on those impaired loans as of the dates presented: June 30, 2016 December 31, 2015 (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 $ 12,326 $ 22,765 $ — $ 12,661 $ 13,157 $ — Commercial and industrial 11,313 12,174 — 14,417 15,220 — Commercial construction 9,918 13,494 — 10,998 14,200 — Consumer real estate 10,983 11,646 — 6,845 7,521 — Other consumer 34 41 — 111 188 — Total without a Related Allowance Recorded 44,574 60,120 — 45,032 50,286 — With a related allowance recorded: Commercial real estate — — — — — — Commercial and industrial 4,499 4,984 1,991 — — — Commercial construction 1,064 1,635 141 500 1,350 3 Consumer real estate 29 29 29 116 116 32 Other consumer 1 1 1 2 2 2 Total with a Related Allowance Recorded 5,593 6,649 2,162 618 1,468 37 Total: Commercial real estate 12,326 22,765 — 12,661 13,157 — Commercial and industrial 15,812 17,158 1,991 14,417 15,220 — Commercial construction 10,982 15,129 141 11,498 15,550 3 Consumer real estate 11,012 11,675 29 6,961 7,637 32 Other consumer 35 42 1 113 190 2 Total $ 50,167 $ 66,769 $ 2,162 $ 45,650 $ 51,754 $ 37 As of June 30, 2016 , we had $50.2 million of impaired loans which included $18.0 million of acquired loans from the Merger that experienced credit deterioration since the acquisition date. The following tables summarize investments in loans considered to be impaired and related information on those impaired loans for the periods presented: For the Three Months Ended June 30, 2016 June 30, 2015 (dollars in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Without a related allowance recorded: Commercial real estate $ 14,619 $ 64 $ 19,733 $ 158 Commercial and industrial 10,959 98 10,782 84 Commercial construction 10,625 48 8,119 81 Consumer real estate 11,028 107 6,891 91 Other consumer 38 — 126 4 Total without a Related Allowance Recorded 47,269 317 45,651 418 With a related allowance recorded: Commercial real estate — — 420 — Commercial and industrial 4,617 31 — — Commercial construction 1,232 6 — — Consumer real estate 29 1 121 2 Other consumer 1 — 4 — Total with a Related Allowance Recorded 5,879 38 545 2 Total: Commercial real estate 14,619 64 20,153 158 Commercial and industrial 15,576 129 10,782 84 Commercial construction 11,857 54 8,119 81 Consumer real estate 11,057 108 7,012 93 Other consumer 39 — 130 4 Total $ 53,148 $ 355 $ 46,196 $ 420 For the Six Months Ended June 30, 2016 June 30, 2015 (dollars in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Without a related allowance recorded: Commercial real estate $ 14,798 $ 132 $ 20,455 $ 322 Commercial and industrial 11,253 189 11,162 146 Commercial construction 10,669 108 6,628 134 Consumer real estate 11,089 243 6,943 186 Other consumer 40 1 86 4 Total without a Related Allowance Recorded 47,849 673 45,274 792 With a related allowance recorded: Commercial real estate — — 211 — Commercial and industrial 4,999 63 — — Commercial construction 1,244 12 — — Consumer real estate 30 1 122 3 Other consumer 2 — 4 — Total with a Related Allowance Recorded 6,275 76 337 3 Total: Commercial real estate 14,798 132 20,666 322 Commercial and industrial 16,252 252 11,162 146 Commercial construction 11,913 120 6,628 134 Consumer real estate 11,119 244 7,065 189 Other consumer 42 1 90 4 Total $ 54,124 $ 749 $ 45,611 $ 795 The following tables detail activity in the ALL for the periods presented: Three Months Ended June 30, 2016 (dollars in thousands) Commercial Real Estate Commercial and Industrial Commercial Construction Consumer Real Estate Other Consumer Total Loans Balance at beginning of period $ 15,266 $ 14,740 $ 10,825 $ 8,261 $ 1,255 $ 50,347 Charge-offs (1,662 ) (136 ) (945 ) (290 ) (463 ) (3,496 ) Recoveries 38 217 2 134 123 514 Net (Charge-offs)/ Recoveries (1,624 ) 81 (943 ) (156 ) (340 ) (2,982 ) Provision for loan losses 2,336 (50 ) 1,819 313 430 4,848 Balance at End of Period $ 15,978 $ 14,771 $ 11,701 $ 8,418 $ 1,345 $ 52,213 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 Six Months Ended June 30, 2016 (dollars in thousands) Commercial Real Estate Commercial and Industrial Commercial Construction Consumer Real Estate Other Consumer Total Loans Balance at beginning of period $ 15,043 $ 10,853 $ 12,625 $ 8,400 $ 1,226 $ 48,147 Charge-offs (1,715 ) (2,830 ) (945 ) (522 ) (1,111 ) (7,123 ) Recoveries 398 420 3 298 207 1,326 Net (Charge-offs)/Recoveries (1,317 ) (2,410 ) (942 ) (224 ) (904 ) (5,797 ) Provision for loan losses 2,252 6,328 18 242 1,023 9,863 Balance at End of Period $ 15,978 $ 14,771 $ 11,701 $ 8,418 $ 1,345 $ 52,213 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 The following tables present the ALL and recorded investments in loans by category as of the periods presented: June 30, 2016 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 Commercial real estate $ — $ 15,978 $ 15,978 $ 12,326 $ 2,376,460 $ 2,388,786 Commercial and industrial 1,991 12,780 14,771 15,812 1,369,934 1,385,746 Commercial construction 141 11,560 11,701 10,982 387,140 398,122 Consumer real estate 29 8,389 8,418 11,012 1,146,459 1,157,471 Other consumer 1 1,344 1,345 35 58,104 58,139 Total $ 2,162 $ 50,051 $ 52,213 $ 50,167 $ 5,338,097 $ 5,388,264 December 31, 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 Commercial real estate $ — $ 15,043 $ 15,043 $ 12,661 $ 2,153,942 $ 2,166,603 Commercial and industrial — 10,853 10,853 14,417 1,242,413 1,256,830 Commercial construction 3 12,622 12,625 11,498 401,946 413,444 Consumer real estate 32 8,368 8,400 6,961 1,109,835 1,116,796 Other consumer 2 1,224 1,226 113 73,826 73,939 Total $ 37 $ 48,110 $ 48,147 $ 45,650 $ 4,981,962 $ 5,027,612

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	6 Months Ended
	Jun. 30, 2016
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, the possibility that we will incur a loss because a counterparty, which may be a financial institution or a customer, fails to meet its contractual obligations. All derivative contracts with financial institutions may be executed only with counterparties approved by our Asset and Liability Committee, or ALCO, and derivatives with customers may only be executed with customers within credit exposure limits approved by our Senior Loan Committee. Interest rate swaps are considered derivatives, but are not accounted for using hedge accounting. As such, changes in the estimated fair value of the derivatives are recorded in current earnings and included in other noninterest income in the Consolidated Statements of Net 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 a period of 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 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 Net 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, 2016 December 31, 2015 June 30, 2016 December 31, 2015 Derivatives not Designated as Hedging Instruments: Interest Rate Swap Contracts- Commercial Loans Fair value $ 16,926 $ 11,295 $ 16,786 $ 11,276 Notional amount 249,799 245,595 249,799 245,595 Collateral posted — — 13,764 12,753 Interest Rate Lock Commitments- Mortgage Loans Fair value 643 261 — — Notional amount 17,959 9,894 — — Forward Sale Contracts- Mortgage Loans Fair value — — 204 5 Notional amount $ — $ — $ 17,073 $ 9,800 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, 2016 December 31, 2015 June 30, 2016 December 31, 2015 Derivatives not Designated as Hedging Instruments: Gross amounts recognized $ 16,926 $ 11,295 $ 16,786 $ 11,276 Gross amounts offset — — — — Net amounts presented in the Consolidated Balance Sheets 16,926 11,295 16,786 11,276 Gross amounts not offset (1) — — (13,764 ) (12,573 ) Net Amount $ 16,926 $ 11,295 $ 3,022 $ (1,297 ) (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) 2016 2015 2016 2015 Derivatives not Designated as Hedging Instruments Interest rate swap contracts—commercial loans $ 23 $ (21 ) $ 120 $ (8 ) Interest rate lock commitments—mortgage loans 117 (8 ) 382 128 Forward sale contracts—mortgage loans (132 ) 92 (199 ) 74 Total Derivatives Gain $ 8 $ 63 $ 303 $ 194

Borrowings

Borrowings	6 Months Ended
	Jun. 30, 2016
Debt Disclosure [Abstract]
Borrowings	Short-term borrowings are for terms under one year and were comprised of REPOs and FHLB advances. All REPOs are overnight short-term investments and are not insured by the Federal Deposit Insurance Corporation. 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 $52.3 million at June 30, 2016 and $67.0 million at December 31, 2015 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. FHLB advances are for various terms and are secured by a blanket lien on residential mortgages and other real estate secured loans. Long-term borrowings are for original terms greater than or equal to 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 FHLB advances. We had total long-term borrowings outstanding of $12.7 million at a fixed rate and $3.1 million at a variable rate at June 30, 2016 , excluding our capital lease of $0.1 million . On March 4, 2015 we assumed $13.5 million of junior subordinated debt from the acquisition of Integrity. On March 5, 2015, we paid off $8.5 million and on June 18, 2015, we paid off the remaining $5.0 million . Information pertaining to borrowings is summarized in the table below as of the dates presented: June 30, 2016 December 31, 2015 (dollars in thousands) Balance Weighted Average Rate Balance Weighted Average Rate Short-term borrowings Securities sold under repurchase agreements $ 48,479 0.01 % $ 62,086 0.01 % Short-term borrowings 550,000 0.60 % 356,000 0.52 % Total short-term borrowings 598,479 0.55 % 418,086 0.44 % Long-term borrowings Other long-term borrowings 15,888 2.92 % 117,043 0.81 % Junior subordinated debt securities 45,619 3.15 % 45,619 2.89 % Total long-term borrowings 61,507 3.09 % 162,662 1.39 % Total Borrowings $ 659,986 0.79 % $ 580,748 0.71 % We had total borrowings at June 30, 2016 and December 31, 2015 at the FHLB of Pittsburgh of $565.8 million and $472.9 million . The $565.8 million at June 30, 2016 consisted of $550.0 million in short-term borrowings and $15.8 million in long-term borrowings. Our maximum borrowing capacity with the FHLB of Pittsburgh was $2.1 billion at June 30, 2016 . Our remaining borrowing availability is $1.3 billion . We utilized $787.9 million of our borrowing capacity at June 30, 2016 consisting of $565.8 million for borrowings and $222.1 million for letters of credit to collateralize public funds.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2016
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 the 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 $2.7 million at June 30, 2016 and $2.5 million at December 31, 2015 . 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 methodology. 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 our commitments and letters of credit as of the dates presented: (dollars in thousands) June 30, 2016 December 31, 2015 Commitments to extend credit $ 1,601,779 $ 1,619,854 Standby letters of credit 80,680 97,676 Total $ 1,682,459 $ 1,717,530 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, 2016
Equity [Abstract]
Other Comprehensive Income	The following table represents the change in components of other comprehensive income (loss) for the periods presented, net of tax effects. Three Months Ended June 30, 2016 Three Months Ended June 30, 2015 (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 net unrealized gains/(losses) on securities available-for-sale $ 4,636 $ (1,622 ) $ 3,014 $ (5,872 ) $ 2,056 $ (3,816 ) Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income (1) — — — 34 (12 ) 22 Adjustment to funded status of employee benefit plans 545 (191 ) 354 463 (162 ) 301 Other Comprehensive Income/(Loss) $ 5,181 $ (1,813 ) $ 3,368 $ (5,375 ) $ 1,882 $ (3,493 ) (1) Reclassification adjustments are comprised of realized security gains or losses. The realized gains or losses 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, 2016 Six Months Ended June 30, 2015 (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 net unrealized gains/(losses) on securities available-for-sale $ 13,669 $ (4,784 ) $ 8,885 $ (889 ) $ 311 $ (578 ) Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income (1) — — — 34 (12 ) 22 Adjustment to funded status of employee benefit plans 4,345 (1,521 ) 2,824 1,192 (324 ) 868 Other Comprehensive Income $ 18,014 $ (6,305 ) $ 11,709 $ 337 $ (25 ) $ 312 (1) Reclassification adjustments are comprised of realized security gains or losses. The realized gains or losses 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, 2016
Compensation and Retirement Disclosure [Abstract]
Employee Benefits	Effective March 31, 2016, the qualified and nonqualified defined benefit plans were amended to freeze benefit accruals for all persons entitled to benefits under the plan. We recorded a curtailment gain in the first quarter of 2016 resulting from the amendment. The curtailment gain totaled $1.0 million and represented the unrecognized benefits associated with prior plan amendments that would have been amortized into income over the next seven years . The qualified plan was previously closed to new participants effective December 31, 2007. We will continue recording pension expense related to this plan, primarily representing interest costs on the accumulated benefit obligation and amortization of actuarial losses accumulated in the plan, as well as income from expected investment returns on pension assets. Prior to March 31, 2016, the accrued benefits were based on years of service and the employee’s compensation for the highest five consecutive years in the last ten years . Contributions were intended to provide for benefits attributed to employee service to date and for those benefits expected to be earned in the future. The expected long-term rate of return on plan assets is 7.50 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 percent 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) 2016 2015 2016 2015 Components of Net Periodic Pension Cost Service cost—benefits earned during the period $ — $ 672 $ 474 $ 1,344 Interest cost on projected benefit obligation 1,036 1,100 2,101 2,200 Expected return on plan assets (1,434 ) (1,807 ) (2,893 ) (3,614 ) Amortization of prior service credit (35 ) (35 ) (70 ) (70 ) Recognized net actuarial loss 526 468 1,070 936 Net Periodic Pension Expense $ 93 $ 398 $ 682 $ 796

Segments

Segments	6 Months Ended
	Jun. 30, 2016
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 and originating commercial and consumer loans. • Our Insurance segment includes a full-service insurance agency offering commercial property and casualty insurance, group life and health coverage, employee benefit solutions and personal insurance lines. • Our Wealth Management segment offers discount brokerage services, services as executor and trustee under wills and deeds, guardian and custodian of employee benefits and other trust and brokerage services, as well as a registered investment advisor that manages private investment accounts for individuals and institutions. The following table represents total assets by reportable operating segment as of the dates presented: (dollars in thousands) June 30, 2016 December 31, 2015 Community Banking $ 6,661,869 $ 6,305,046 Insurance 8,336 9,619 Wealth Management 4,000 3,689 Total Assets $ 6,674,205 $ 6,318,354 The following tables provide financial information for our three operating segments for the three and six month periods ended June 30, 2016 and 2015 . 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, 2016 (dollars in thousands) Community Banking Insurance Wealth Management Eliminations Consolidated Interest income $ 55,839 $ 1 $ 117 $ (107 ) $ 55,850 Interest expense 6,213 — — (71 ) 6,142 Net interest income 49,626 1 117 (36 ) 49,708 Provision for loan losses 4,848 — — — 4,848 Noninterest income 8,589 1,093 2,627 139 12,448 Noninterest expense 29,462 1,103 2,437 103 33,105 Depreciation expense 1,224 11 4 — 1,239 Amortization of intangible assets 391 12 6 — 409 Provision for income taxes 5,404 (12 ) 104 — 5,496 Net Income (Loss) $ 16,886 $ (20 ) $ 193 $ — $ 17,059 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 Six Months Ended June 30, 2016 (dollars in thousands) Community Banking Insurance Wealth Management Eliminations Consolidated Interest income $ 110,857 $ 1 $ 245 $ (233 ) $ 110,870 Interest expense 11,651 — — (127 ) 11,524 Net interest income 99,206 1 245 (106 ) 99,346 Provision for loan losses 9,863 — — — 9,863 Noninterest income 18,919 2,717 5,373 1,256 28,265 Noninterest expense 61,610 2,358 4,743 1,150 69,861 Depreciation expense 2,410 21 8 — 2,439 Amortization of intangible assets 831 25 13 — 869 Provision for income taxes 11,018 110 299 — 11,427 Net Income $ 32,393 $ 204 $ 555 $ — $ 33,152 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

Qualified Affordable Housing Pr

Qualified Affordable Housing Projects	6 Months Ended
	Jun. 30, 2016
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 was $13.4 million at June 30, 2016 and $15.0 million at December 31, 2015 . We had no open commitments to fund current or future investments in qualified affordable housing projects at June 30, 2016 or December 31, 2015 . Amortization expense, included in other noninterest expense in the Consolidated Statements of Net Income, was $0.8 million and $1.6 million for the three and six months ended June 30, 2016 and $0.9 million and $1.9 million for the three and six months ended June 30, 2015 . The amortization expense was offset by tax credits of $0.9 million and $1.8 million for the three and six months ended June 30, 2016 and $1.0 million and $2.0 million for the three and six months ended June 30, 2015 as a reduction to our federal tax provision.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2016
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, 2015 , filed with the Securities and Exchange Commission, or SEC, on February 23, 2016. 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 A mounts in prior period financial statements and footnotes are reclassified whenever necessary to conform to the current period presentation. Reclassifications had no 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 and Recently Issued, Not Yet Adopted Accounting Standards Updates, or ASUs	Recently Adopted Accounting Standards Updates, or ASU Business Combinations - Simplifying the Accounting for Measurement Period Adjustments In September 2015, the Financial Accounting Standards Board, or FASB, issued ASU No. 2015-16, Business Combinations - Simplifying the Accounting for Measurement Period Adjustments (Topic 805); The amendments in this ASU No. 2015-16 eliminate the requirement to retrospectively adjust the financial statements for measurement-period adjustments as if they were known at the acquisition date, but are recognized in the reporting period in which they are determined. Additional disclosures are required about the impact on current-period income statement line items of adjustments that would have been recognized in prior periods if that information had been revised. The measurement period is a reasonable time period after the acquisition date when the acquirer may adjust the provisional amounts recognized for a business combination if the necessary information is not available by the end of the reporting period in which the acquisition occurs. The measurement periods cannot continue for more than one year from the acquisition date. The standard is effective for annual periods and interim periods beginning after December 15, 2015. The adoption of this ASU had no impact on our results of operations or financial position. 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 No. 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. The adoption of this ASU had no 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, 2015. In September 2015, the FASB issued ASU No. 2015-15, Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements. ASU No. 2015-15 amends the SEC Content in Subtopic 835-30 by adding SEC paragraph 835-30-S35-1, Interest-Imputation of Interest Subsequent Measurement and paragraph 830-30-S45-1, Other Presentation Matters. These paragraphs were added because ASU No. 2015-03 issued in April 2015 does not address presentation or subsequent measurement of debt issuance costs related to "line-of-credit arrangements." The adoption of this ASU had no material impact on our results of operations or financial position. Consolidation: Amendments to the Consolidation Analysis In February 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, or 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; and 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. The adoption of this ASU had no 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 No. 2015-01 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. The adoption of this ASU had no impact on our results of operations or financial position. Recently Issued Accounting Standards Updates not yet Adopted Financial Instruments - Credit Losses In June 2016, the FASB issued ASU No. 2016-13, Measurement of Credit Losses on Financial Instruments. The main objective of this ASU is to provide financial statement users with more decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The amendments of this update replace the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. The collective changes to the recognition and measurement accounting standards for financial instruments and their anticipated impact on the allowance for credit losses modeling have been universally referred to as the CECL, or current expected credit loss, model. This Update is effective for interim and annual reporting periods in fiscal years beginning after December 15, 2019. Early adoption is permitted as of the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. We are evaluating the provisions of this ASU to determine the potential impact on our results of operations and financial position. Revenue from Contracts with Customers In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date. This ASU defers the effective date of ASU No. 2014-09 for all entities by one year. The new revenue pronouncement creates a single source of revenue guidance for all companies in all industries and is more principles-based than current revenue guidance. The pronouncement provides a five-step model for a company to recognize revenue when it transfers control of goods or services to customers at an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. The five steps are: 1. identify the contract with the customer; 2. identify the separate performance obligations in the contract; 3. determine the transaction price; 4. allocate the transaction price to the separate performance obligations; and 5. recognize revenue when each performance obligation is satisfied. The Update is effective for interim and annual reporting periods in fiscal years beginning after December 15, 2017. Early adoption is permitted as of the original effective date for interim and annual reporting periods in fiscal years beginning after December 15, 2016. In March 2016, the FASB issued ASU No. 2016-08, Principal versus Agent Considerations (Reporting Revenue Gross versus Net), as an amendment to ASU No. 2014-09 to improve Topic 606, Revenue from Contracts with Customers by reducing: 1. The potential for diversity in practice arising from inconsistent and application of the principal versus agent guidance, and 2. The cost and complexity of applying Topic 606 both at transition and on an ongoing basis. The effective date and transition requirements for the amendments in both of these Updates are the same as the effective date and transition requirements in Topic 606 (and any other Topic amended by Update 2014-09). ASU 2015-14. In April 2016, the FASB issued ASU No. 2016-10, Identifying Performance Obligations and Licensing, as an amendment to ASU No. 2014-09 to improve Topic 606, Revenue from Contracts with Customers, by reducing: 1. The potential for diversity in practice at initial application, and 2. The cost and complexity of applying Topic 606 both at transition and on an ongoing basis. In May 2016, the FASB issued ASU No. 2016-12, Narrow-scope Improvements and Practical Expedients. The amendments in this ASU do not change the core principles of Topic 606, Revenue from Contracts with Customers. These amendments affect only the narrow aspects of Topic 606: 1. Collectibility Criterion, 2. Presentation of Sales Taxes and Other Similar Taxes Collected from Customers, 3. Noncash Consideration, 4. Contract Modifications at Transition, and 5. Completed Contracts at Transition. We are evaluating the provisions of these ASUs to determine the potential impact to our results of operations and financial position. Stock Compensation - Improvements to Employee Share-Based Payment Accounting On March 31, 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting, which is intended to improve the accounting for share-based payment transactions as part of the FASB's simplification initiative. The ASU changes seven aspects of the accounting for share-based payment award transactions, including; 1. accounting for income taxes; 2. classification of excess tax benefits on the statement of cash flows; 3. forfeitures; 4. minimum statutory tax withholding requirements; 5. classification of employee taxes paid on the statement of cash flows when an employer withholds shares for tax-withholding purposes; 6. practical expedient -- expected term (nonpublic only); and 7. intrinsic value (nonpublic only). This ASU is effective for fiscal years beginning after December 15, 2016 and interim periods within those years for public business entities. Early adoption is permitted in any interim or annual period provided that the entire ASU is adopted. We do not expect that this ASU will have a material impact on our results of operations and financial position. Equity Method and Joint Ventures - Simplifying the Transition to the Equity Method of Accounting In March 2016, the FASB issued ASU No. 2016-07, Simplifying the Transition to the Equity Method of Accounting, which eliminates the requirement for an investor to retroactively apply the equity method when its increase in ownership interest (or degree of influence) in an investee triggers equity method accounting. This ASU is effective for annual and interim periods in fiscal years beginning after December 15, 2016. The amendments should be applied prospectively upon their effective date to increases in the level of ownership interest or degree of influence that result in the adoption of the equity method. Earlier application is permitted. We do not expect that this ASU will have a material impact on our results of operations and financial position. Leases - Section A-Amendments to the FASB Accounting Standards Codification, Section B-Conforming Amendments Related to Leases and Section C-Background Information and Basis for Conclusions In February 2016, the FASB issued ASU No. 2016-02, Leases, which, requires lessees to recognize a right-to-use asset and a lease obligation for all leases on the balance sheet. Lessor accounting remains substantially similar to current GAAP. ASU 2016-02 supersedes Topic 840, Leases. This ASU is effective for annual and interim periods in fiscal years beginning after December 15, 2018. ASU 2016-02 mandates a modified retrospective transition method for all entities. Early adoption of this ASU is permitted. We anticipate that this ASU will impact our financial statements as it relates to the recognition of right-to-use assets and lease obligations on our Consolidated Balance Sheet. However, we do not expect that this ASU will have a material impact on our Consolidated Statement of Comprehensive Income. Accounting for Financial Instruments - Overall: Classification and Measurement In January 2016, the FASB issued ASU No. 2016-01, Accounting for Financial Instruments - Overall: Classification and Measurement (Subtopic 825-10). The amendments in this ASU No. 2016-01 address the following: 1. require equity investments to be measured at fair value with changes in fair value recognized in net income; 2. simplify the impairment assessment of equity investments without readily-determinable fair values by requiring a qualitative assessment to identify impairment; 3. eliminate the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; 4. require entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes; 5. require separate presentation in other comprehensive income for the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; 6. require separate presentation of financial assets and financial liabilities by measurement category and form of financial asset (that is, securities or loans and receivables) on the balance sheet or the accompanying notes to the financial statements; and 7. clarify that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity's other deferred tax assets. We anticipate that this ASU will have a significant impact on our financial statements and disclosures primarily as it relates to recognizing the fair value changes for equity securities in net income rather than an adjustment to equity through other comprehensive income.
Fair Value Measurements	We use fair value measurements when recording and disclosing certain financial assets and liabilities. Securities available-for-sale, trading assets and derivative financial instruments 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, and other repossessed assets, 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 estimates of assumptions that market participants would use in pricing an asset or liability, which are developed based on the best information available in the circumstances. The fair value hierarchy gives the highest priority to unadjusted quoted market prices in active markets for identical assets or liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The fair value hierarchy is broken down into three levels based on the reliability of inputs as follows: Level 1: valuation is based upon unadjusted quoted market prices for identical instruments traded in active markets. Level 2: valuation is based upon quoted market prices for similar instruments traded in active markets, quoted market prices for identical or similar instruments traded in markets that are not active and model-based valuation techniques for which all significant assumptions are observable in the market or can be corroborated by market data. Level 3: valuation is derived from other valuation methodologies, including discounted cash flow models and similar techniques that use significant assumptions not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in determining fair value. A financial instrument’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement. Our policy is to recognize transfers between any of the fair value hierarchy levels at the end of the reporting period in which the transfer occurred. The following are descriptions of the valuation methodologies that we use for financial instruments recorded at fair value on either a recurring or nonrecurring basis. Recurring Basis Securities Available-for-Sale Securities available-for-sale include both debt and equity securities. We obtain fair values for debt securities from a third-party pricing service which utilizes several sources for valuing fixed-income securities. We validate prices received from our pricing service through comparison to a secondary pricing service and broker quotes. We review the methodologies of the pricing service which provides us with a sufficient understanding of the valuation models, assumptions, inputs and pricing to reasonably measure the fair value of our debt securities. The market evaluation 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 and any applicable credit enhancements and collateral postings. Nonrecurring Basis Loans Held for Sale Loans held for sale consist of 1-4 family residential loans originated for sale in the secondary market and, from time to time, certain loans transferred from the loan portfolio to loans held for sale, all of which are carried at the lower of cost or fair value. The fair value of 1-4 family residential loans is based on the principal or most advantageous market currently offered for similar loans using observable market data. The fair value of the loans transferred from the loan portfolio is based on the amounts offered for these loans in currently pending sales transactions. Loans held for sale carried at fair value are classified as Level 3. Impaired Loans Impaired loans are carried at the lower of carrying value or fair value. Fair value is determined as the recorded investment balance less any specific reserve. We establish specific reserves 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. Other Assets We measure certain other assets at fair value on a nonrecurring basis. Fair value is based on the application of lower of cost or fair value accounting, or write-downs of individual assets. Valuation methodologies used to measure fair value are consistent with overall principles of fair value accounting and consistent with those described above. Financial Instruments In addition to financial instruments recorded at fair value in our financial statements, fair value accounting guidance requires disclosure of the fair value of all of an entity’s assets and liabilities that are considered financial instruments. The majority of our assets and liabilities are considered financial instruments. Many of these instruments lack an available trading market as characterized by a willing buyer and willing seller engaged in an exchange transaction. Also, it is our general practice and intent to hold our financial instruments to maturity and to not engage in trading or sales activities with respect to such financial instruments. For fair value disclosure purposes, we substantially utilize the fair value measurement criteria as required and explained above. In cases where quoted fair values are not available, we use present value methods to determine the fair value of our financial instruments. Cash and Cash Equivalents 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 nonperforming loans is the carrying value less any specific reserve on the loan if it is impaired. 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; 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, or REPOs, 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 carrying values approximate their fair 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.
Allowance for Loans Losses by Portfolio	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 does 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 residential mortgages, 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. 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.
Loans Credit Risk Rating	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.
Derivative Financial Instruments	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, the possibility that we will incur a loss because a counterparty, which may be a financial institution or a customer, fails to meet its contractual obligations. All derivative contracts with financial institutions may be executed only with counterparties approved by our Asset and Liability Committee, or ALCO, and derivatives with customers may only be executed with customers within credit exposure limits approved by our Senior Loan Committee. Interest rate swaps are considered derivatives, but are not accounted for using hedge accounting. As such, changes in the estimated fair value of the derivatives are recorded in current earnings and included in other noninterest income in the Consolidated Statements of Net 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 a period of 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 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 Net Income.

Business Combinations (Tables)

Business Combinations (Tables)	6 Months Ended
	Jun. 30, 2016
Business Combinations [Abstract]
Summary of Consideration, Assets Acquired and Liabilities Assumed	The following table summarizes total consideration, assets acquired and liabilities assumed from the Merger: (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 19,088 Total Assets Acquired 864,982 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 56,129 Goodwill $ 115,850

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Reconciles Numerators and Denominators of Basic Earnings Per Share with Diluted Earnings Per Share	The following table reconciles the numerators and denominators of basic and 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) 2016 2015 2016 2015 Numerator for Earnings per Share—Basic: Net income $ 17,059 $ 18,188 $ 33,152 $ 31,023 Less: Income allocated to participating shares 60 79 101 123 Net Income Allocated to Shareholders $ 16,999 $ 18,109 $ 33,051 $ 30,900 Numerator for Earnings per Share—Diluted: Net income $ 17,059 $ 18,188 $ 33,152 $ 31,023 Net Income Available to Shareholders $ 17,059 $ 18,188 $ 33,152 $ 31,023 Denominators for Earnings per Share: Weighted Average Shares Outstanding—Basic 34,674,712 34,652,895 34,666,773 32,951,936 Add: Potentially dilutive shares 89,853 28,283 80,890 36,359 Denominator for Treasury Stock Method—Diluted 34,764,565 34,681,178 34,747,663 32,988,295 Weighted Average Shares Outstanding—Basic 34,674,712 34,652,895 34,666,773 32,951,936 Add: Average participating shares outstanding 122,160 151,134 105,794 131,563 Denominator for Two-Class Method—Diluted 34,796,872 34,804,029 34,772,567 33,083,499 Earnings per share—basic $ 0.49 $ 0.52 $ 0.96 $ 0.94 Earnings per share—diluted $ 0.49 $ 0.52 $ 0.95 $ 0.94 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 - expired in December 2015 — 155,500 — 155,500 Restricted stock considered anti-dilutive excluded from potentially dilutive shares 144,998 122,851 117,796 95,204

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	6 Months Ended
	Jun. 30, 2016
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, 2016 and December 31, 2015 . There were no transfers between Level 1 and Level 2 for items measured at fair value on a recurring basis during the periods presented. June 30, 2016 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Securities available-for-sale: U.S. Treasury securities $ — $ 15,103 $ — $ 15,103 Obligations of U.S. government corporations and agencies — 262,265 — 262,265 Collateralized mortgage obligations of U.S. government corporations and agencies — 143,262 — 143,262 Residential mortgage-backed securities of U.S. government corporations and agencies — 38,014 — 38,014 Commercial mortgage-backed securities of U.S. government corporations and agencies — 81,668 — 81,668 Obligations of states and political subdivisions — 134,250 — 134,250 Marketable equity securities — 8,917 — 8,917 Total securities available-for-sale — 683,479 — 683,479 Trading securities held in a Rabbi Trust 4,196 — — 4,196 Total securities 4,196 683,479 — 687,675 Derivative financial assets: Interest rate swap contracts - commercial loans — 16,926 — 16,926 Interest rate lock commitments - mortgage loans — 643 — 643 Total Assets $ 4,196 $ 701,048 $ — $ 705,244 LIABILITIES Derivative financial liabilities: Interest rate swap contracts - commercial loans $ — $ 16,786 $ — $ 16,786 Forward sale contracts - mortgage loans — 204 — 204 Total Liabilities $ — $ 16,990 $ — $ 16,990 December 31, 2015 (dollars in thousands) Level 1 Level 2 Level 3 Total ASSETS Securities available-for-sale: U.S. Treasury securities $ — $ 14,941 $ — $ 14,941 Obligations of U.S. government corporations and agencies — 263,303 — 263,303 Collateralized mortgage obligations of U.S. government corporations and agencies — 128,835 — 128,835 Residential mortgage-backed securities of U.S. government corporations and agencies — 40,125 — 40,125 Commercial mortgage-backed securities of U.S. government corporations and agencies — 69,204 — 69,204 Obligations of states and political subdivisions — 134,886 — 134,886 Marketable equity securities — 9,669 — 9,669 Total securities available-for-sale — 660,963 — 660,963 Trading securities held in a Rabbi Trust 4,021 — — 4,021 Total securities 4,021 660,963 — 664,984 Derivative financial assets: Interest rate swap contracts - commercial loans — 11,295 — 11,295 Interest rate lock commitments - mortgage loans — 261 — 261 Total Assets $ 4,021 $ 672,519 $ — $ 676,540 LIABILITIES Derivative financial liabilities: Interest rate swap contracts - commercial loans $ — $ 11,276 $ — $ 11,276 Forward sale contracts - mortgage loans — 5 — 5 Total Liabilities $ — $ 11,281 $ — $ 11,281
Assets Measured at Estimated Fair Value on Nonrecurring Basis by Fair Value Hierarchy	The following table presents our assets that are measured at fair value on a nonrecurring basis by the fair value hierarchy level as of the dates presented: June 30, 2016 December 31, 2015 (dollars in thousands) Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total ASSETS (1) Impaired loans — — 14,343 14,343 — — 9,373 9,373 Other real estate owned — — 149 149 — — 158 158 Mortgage servicing rights — — 3,094 3,094 — — 3,396 3,396 Total Assets $ — $ — $ 17,586 $ 17,586 $ — $ — $ 12,927 $ 12,927 (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, 2016 and December 31, 2015 are presented in the following tables: Carrying Value (1) Fair Value Measurements at June 30, 2016 (dollars in thousands) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 94,991 $ 94,991 $ 94,991 $ — $ — Securities available-for-sale 683,479 683,479 — 683,479 — Loans held for sale 11,999 12,485 — — 12,485 Portfolio loans, net of unearned income 5,388,264 5,380,012 — — 5,380,012 Bank owned life insurance 70,991 70,991 — 70,991 — FHLB and other restricted stock 27,755 27,755 — — 27,755 Trading securities held in a Rabbi Trust 4,196 4,196 4,196 — — Mortgage servicing rights 3,094 3,094 — — 3,094 Interest rate swap contracts - commercial loans 16,926 16,926 — 16,926 — Interest rate lock commitments - mortgage loans 643 643 — 643 — LIABILITIES Deposits $ 5,120,318 $ 5,127,474 $ — $ — $ 5,127,474 Securities sold under repurchase agreements 48,479 48,479 — — 48,479 Short-term borrowings 550,000 550,000 — — 550,000 Long-term borrowings 15,888 16,843 — — 16,843 Junior subordinated debt securities 45,619 45,619 — — 45,619 Interest rate swap contracts - commercial loans 16,786 16,786 — 16,786 — Forward sale contracts - mortgage loans 204 204 — 204 — (1) As reported in the Consolidated Balance Sheets Carrying Value (1) Fair Value Measurements at December 31, 2015 (dollars in thousands) Total Level 1 Level 2 Level 3 ASSETS Cash and due from banks, including interest-bearing deposits $ 99,399 $ 99,399 $ 99,399 $ — $ — Securities available-for-sale 660,963 660,963 — 660,963 — Loans held for sale 35,321 35,500 — — 35,500 Portfolio loans, net of unearned income 5,027,612 5,001,004 — — 5,001,004 Bank owned life insurance 70,175 70,175 — 70,175 — FHLB and other restricted stock 23,032 23,032 — — 23,032 Trading securities held in a Rabbi Trust 4,021 4,021 4,021 — — Mortgage servicing rights 3,237 3,396 — — 3,396 Interest rate swap contracts - commercial loans 11,295 11,295 — 11,295 — Interest rate lock commitments - mortgage loans 261 261 — 261 — LIABILITIES Deposits $ 4,876,611 $ 4,881,718 $ — $ — $ 4,881,718 Securities sold under repurchase agreements 62,086 62,086 — — 62,086 Short-term borrowings 356,000 356,000 — — 356,000 Long-term borrowings 117,043 117,859 — — 117,859 Junior subordinated debt securities 45,619 45,619 — — 45,619 Interest rate swap contracts - commercial loans 11,276 11,276 — 11,276 — Forward sale contracts - mortgage loans 5 5 — 5 — (1) As reported in the Consolidated Balance Sheets

Securities Available-for-Sale (

Securities Available-for-Sale (Tables)	6 Months Ended
	Jun. 30, 2016
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, 2016 December 31, 2015 (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 $ 14,934 $ 169 $ — $ 15,103 $ 14,914 $ 27 $ — $ 14,941 Obligations of U.S. government corporations and agencies 256,526 5,739 — 262,265 262,045 1,825 (567 ) 263,303 Collateralized mortgage obligations of U.S. government corporations and agencies 139,532 3,730 — 143,262 128,458 693 (316 ) 128,835 Residential mortgage-backed securities of U.S. government corporations and agencies 36,396 1,618 — 38,014 39,185 1,091 (151 ) 40,125 Commercial mortgage-backed securities of U.S. government corporations and agencies 79,517 2,151 — 81,668 69,697 183 (676 ) 69,204 Obligations of states and political subdivisions 125,145 9,105 — 134,250 128,904 5,988 (6 ) 134,886 Debt Securities 652,050 22,512 — 674,562 643,203 9,807 (1,716 ) 651,294 Marketable equity securities 7,579 1,339 (1 ) 8,917 7,579 2,090 — 9,669 Total $ 659,629 $ 23,851 $ (1 ) $ 683,479 $ 650,782 $ 11,897 $ (1,716 ) $ 660,963
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, 2016 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 U.S. Treasury securities — $ — $ — — $ — $ — — $ — $ — Obligations of U.S. government corporations and agencies — — — — — — — — — Collateralized mortgage obligations of U.S. government corporations and agencies — — — — — — — — — Residential mortgage-backed securities of U.S. government corporations and agencies — — — — — — — — — Commercial mortgage-backed securities of U.S. government corporations and agencies — — — — — — — — — Obligations of states and political subdivisions — — — — — — — — — Debt Securities — — — — — — — — — Marketable equity securities 1 70 (1 ) — — — 1 70 (1 ) Total Temporarily Impaired Securities 1 $ 70 $ (1 ) — $ — $ — 1 $ 70 $ (1 ) December 31, 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 U.S. Treasury securities — $ — $ — — $ — $ — — $ — $ — Obligations of U.S. government corporations and agencies 10 88,584 (379 ) 2 14,542 (188 ) 12 103,126 (567 ) Collateralized mortgage obligations of U.S. government corporations and agencies 6 61,211 (316 ) — — — 6 61,211 (316 ) Residential mortgage-backed securities of U.S. government corporations and agencies 1 7,993 (151 ) — — — 1 7,993 (151 ) Commercial mortgage-backed securities of U.S. government corporations and agencies 5 50,839 (450 ) 1 9,472 (226 ) 6 60,311 (676 ) Obligations of states and political subdivisions 1 5,370 (6 ) — — — 1 5,370 (6 ) Debt Securities 23 213,997 (1,302 ) 3 24,014 (414 ) 26 238,011 (1,716 ) Marketable equity securities — — — — — — — — — Total Temporarily Impaired Securities 23 $ 213,997 $ (1,302 ) 3 $ 24,014 $ (414 ) 26 $ 238,011 $ (1,716 )
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, 2016 December 31, 2015 (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 $ 23,851 $ (1 ) $ 23,850 $ 11,897 $ (1,716 ) $ 10,181 Income tax expense/(benefit) 8,347 — 8,347 4,164 (601 ) 3,563 Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss) $ 15,504 $ (1 ) $ 15,503 $ 7,733 $ (1,115 ) $ 6,618
Amortized Cost and Fair Value of Available-for-Sale Securities	The amortized cost and fair value of securities available-for-sale at June 30, 2016 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, 2016 (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 $ 46,370 $ 46,509 Due after one year through five years 211,742 217,558 Due after five years through ten years 66,087 69,318 Due after ten years 72,406 78,233 396,605 411,618 Collateralized mortgage obligations of U.S. government corporations and agencies 139,532 143,262 Residential mortgage-backed securities of U.S. government corporations and agencies 36,396 38,014 Commercial mortgage-backed securities of U.S. government corporations and agencies 79,517 81,668 Debt Securities 652,050 674,562 Marketable equity securities 7,579 8,917 Total $ 659,629 $ 683,479

Loans and Loans Held for Sale (

Loans and Loans Held for Sale (Tables)	6 Months Ended
	Jun. 30, 2016
Receivables [Abstract]
Composition of Loans	The following table indicates the composition of the acquired and originated loans as of the dates presented: (dollars in thousands) June 30, 2016 December 31, 2015 Commercial Commercial real estate $ 2,388,786 $ 2,166,603 Commercial and industrial 1,385,746 1,256,830 Commercial construction 398,122 413,444 Total Commercial Loans 4,172,654 3,836,877 Consumer Residential mortgage 671,665 639,372 Home equity 480,204 470,845 Installment and other consumer 58,139 73,939 Consumer construction 5,602 6,579 Total Consumer Loans 1,215,610 1,190,735 Total Portfolio Loans 5,388,264 5,027,612 Loans held for sale 11,999 35,321 Total Loans $ 5,400,263 $ 5,062,933
Restructured Loans for Periods Presented	The following tables present the restructured loans during the periods presented: Three Months Ended June 30, 2016 Three Months Ended June 30, 2015 (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 $ 4,721 $ 2,270 $ (2,451 ) — $ — $ — $ — Commercial and industrial Principal deferral 5 985 985 — — — — — Principal forgiveness — — — — 1 400 400 — Maturity date extension 1 130 130 — — — — — Commercial Construction Maturity date extension 4 1,324 1,269 (55 ) — — — — Residential mortgage Principal deferral 1 3,273 3,273 — — — — — Chapter 7 bankruptcy (2) 1 65 64 (1 ) — — — — Maturity date extension and interest rate reduction — — — — 2 225 225 — Home equity Chapter 7 bankruptcy (2) 4 73 69 (4 ) 4 171 171 — Maturity date extension 3 120 120 — — — — — Installment and other consumer Chapter 7 bankruptcy (2) 2 16 13 (3 ) — — — — Total by Concession Type Principal forgiveness — $ — $ — $ — 1 $ 400 $ 400 $ — Principal deferral 7 8,979 6,528 (2,451 ) — — — — Chapter 7 bankruptcy (2) 7 154 146 (8 ) 4 171 171 — Interest rate reduction — — — — — — — — Maturity date extension and interest rate reduction — — — — 2 225 225 — Maturity date extension 8 1,574 1,519 (55 ) — — — — Total 22 $ 10,707 $ 8,193 $ (2,514 ) 7 $ 796 $ 796 $ — (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, 2016 Six Months Ended June 30, 2015 (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 1 $ 4,721 $ 2,270 $ (2,451 ) 2 $ 2,851 $ 2,851 $ — Chapter 7 bankruptcy(2) 1 709 681 (28 ) — — — — Commercial and industrial Principal forgiveness — — — — 1 400 400 — Principal deferral 5 985 985 — 6 661 661 — Chapter 7 bankruptcy (2) — — — — 1 3 1 (2 ) Maturity date extension 3 755 728 (27 ) 1 780 765 (15 ) Commercial Construction Principal deferral — — — — 1 104 103 (1 ) Maturity date extension 5 1,357 1,303 (54 ) — — — — Residential mortgage Principal deferral 1 3,273 3,273 — — — — — Chapter 7 bankruptcy (2) 4 285 280 (5 ) — — — — Maturity date extension 1 483 483 — — — — — Maturity date extension and interest rate reduction — — — — 2 225 225 — Home equity Principal deferral 1 47 46 (1 ) — — — — Chapter 7 bankruptcy (2) 9 318 309 (9 ) 12 313 304 (9 ) Maturity date extension and interest rate reduction 1 130 128 (2 ) — — — — Maturity date extension 4 274 272 (2 ) 1 71 71 — Installment and other consumer Chapter 7 bankruptcy (2) 2 16 13 $ (3 ) — — — $ — Total by Concession Type Principal forgiveness — $ — $ — $ — 1 $ 400 $ 400 $ — Principal deferral 8 9,026 6,574 (2,452 ) 9 3,616 3,615 (1 ) Chapter 7 bankruptcy (2) 16 1,328 1,283 (45 ) 13 316 305 (11 ) Interest rate reduction — — — — — Maturity date extension and interest rate reduction 1 130 128 (2 ) 2 225 225 — Maturity date extension 13 2,869 2,786 (83 ) 2 851 836 (15 ) Total 38 $ 13,353 $ 10,771 $ (2,582 ) 27 $ 5,408 $ 5,381 $ (27 ) (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. The following table summarizes the restructured loans as of the dates presented: June 30, 2016 December 31, 2015 (dollars in thousands) Performing TDRs Nonperforming TDRs Total TDRs Performing TDRs Nonperforming TDRs Total TDRs Commercial real estate $ 4,263 $ 4,369 $ 8,632 $ 6,822 $ 3,548 $ 10,370 Commercial and industrial 6,241 2,535 8,776 6,321 1,570 7,891 Commercial construction 4,351 2,820 7,171 5,013 1,265 6,278 Residential mortgage 2,493 4,411 6,904 2,590 665 3,255 Home equity 3,225 882 4,107 3,184 523 3,707 Installment and other consumer 25 11 36 25 88 113 Total $ 20,598 $ 15,028 $ 35,626 $ 23,955 $ 7,659 $ 31,614
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 June 30, Six Months Ended June 30, 2016 2015 2016 2015 (dollars in thousands) Number of Defaults Recorded Investment Number of Defaults Recorded Investment Number of Recorded Number of Recorded Commercial real estate — $ — — $ — — $ — — $ — Commercial and Industrial — — — — — — — — Commercial construction — — — — 1 605 — — Residential mortgage — — — — — — 1 183 Home equity — — 2 119 — — 3 124 Installment and other consumer — — — — — — — — Consumer construction — — — — — — — — Total — $ — 2 $ 119 1 $ 605 4 $ 307
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, 2016 December 31, 2015 Nonperforming Assets Nonaccrual loans $ 27,877 $ 27,723 Nonaccrual TDRs 15,028 7,659 Total nonaccrual loans 42,905 35,382 OREO 328 354 Total Nonperforming Assets $ 43,233 $ 35,736

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	6 Months Ended
	Jun. 30, 2016
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 the dates presented: June 30, 2016 (dollars in thousands) Current 30-59 Days Past Due 60-89 Days Past Due Nonaccrual Total Past Due Total Loans Commercial real estate $ 2,367,849 $ 7,384 $ 2,666 $ 10,887 $ 20,937 $ 2,388,786 Commercial and industrial 1,366,728 7,276 400 11,342 19,018 1,385,746 Commercial construction 382,985 5,644 1,311 8,182 15,137 398,122 Residential mortgage 657,352 1,191 3,839 9,283 14,313 671,665 Home equity 472,085 4,223 728 3,168 8,119 480,204 Installment and other consumer 57,916 153 27 43 223 58,139 Consumer construction 5,602 — — — — 5,602 Loans held for sale 11,999 — — — — 11,999 Total $ 5,322,516 $ 25,871 $ 8,971 $ 42,905 $ 77,747 $ 5,400,263 December 31, 2015 (dollars in thousands) Current 30-59 Days Past Due 60-89 Days Past Due Nonaccrual Total Past Due Total Loans Commercial real estate $ 2,145,655 $ 11,602 $ 627 $ 8,719 $ 20,948 $ 2,166,603 Commercial and industrial 1,244,802 2,453 296 9,279 12,028 1,256,830 Commercial construction 401,084 3,517 90 8,753 12,360 413,444 Residential mortgage 631,085 1,728 930 5,629 8,287 639,372 Home equity 465,055 2,365 523 2,902 5,790 470,845 Installment and other consumer 73,486 242 111 100 453 73,939 Consumer construction 6,579 — — — — 6,579 Loans held for sale 35,179 94 48 — 142 35,321 Total $ 5,002,925 $ 22,001 $ 2,625 $ 35,382 $ 60,008 $ 5,062,933
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, 2016 (dollars in thousands) Commercial Real Estate % of Total Commercial and Industrial % of Total Commercial Construction % of Total Total % of Total Pass $ 2,314,317 96.9 % $ 1,302,427 94.0 % $ 361,494 90.8 % $ 3,978,238 95.3 % Special mention 22,277 0.9 % 31,865 2.3 % 20,228 5.1 % 74,370 1.8 % Substandard 52,192 2.2 % 51,454 3.7 % 16,400 4.1 % 120,046 2.9 % Total $ 2,388,786 100.0 % $ 1,385,746 100.0 % $ 398,122 100.0 % $ 4,172,654 100.0 % December 31, 2015 (dollars in thousands) Commercial Real Estate % of Total Commercial and Industrial % of Total Commercial Construction % of Total Total % of Total Pass $ 2,094,851 96.7 % $ 1,182,685 94.1 % $ 375,808 90.9 % $ 3,653,344 95.2 % Special mention 19,938 0.9 % 43,896 3.5 % 19,846 4.8 % 83,680 2.2 % Substandard 51,814 2.4 % 30,249 2.4 % 17,790 4.3 % 99,853 2.6 % Total $ 2,166,603 100.0 % $ 1,256,830 100.0 % $ 413,444 100.0 % $ 3,836,877 100.0 %
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, 2016 (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 $ 662,382 98.6 % $ 477,036 99.3 % $ 58,096 99.9 % $ 5,602 100.0 % $ 1,203,116 99.0 % Nonperforming 9,283 1.4 % 3,168 0.7 % 43 0.1 % — — % 12,494 1.0 % Total $ 671,665 100.0 % $ 480,204 100.0 % $ 58,139 100.0 % $ 5,602 100.0 % $ 1,215,610 100.0 % December 31, 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 $ 633,743 99.1 % $ 467,943 99.4 % $ 73,839 99.8 % $ 6,579 100.0 % $ 1,182,104 99.3 % Nonperforming 5,629 0.9 % 2,902 0.6 % 100 0.2 % — — % 8,631 0.7 % Total $ 639,372 100.0 % $ 470,845 100.0 % $ 73,939 100.0 % $ 6,579 100.0 % $ 1,190,735 100.0 %
Investments in Loans Considered to be Impaired and Related Information on Impaired Loans	For the Six Months Ended June 30, 2016 June 30, 2015 (dollars in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Without a related allowance recorded: Commercial real estate $ 14,798 $ 132 $ 20,455 $ 322 Commercial and industrial 11,253 189 11,162 146 Commercial construction 10,669 108 6,628 134 Consumer real estate 11,089 243 6,943 186 Other consumer 40 1 86 4 Total without a Related Allowance Recorded 47,849 673 45,274 792 With a related allowance recorded: Commercial real estate — — 211 — Commercial and industrial 4,999 63 — — Commercial construction 1,244 12 — — Consumer real estate 30 1 122 3 Other consumer 2 — 4 — Total with a Related Allowance Recorded 6,275 76 337 3 Total: Commercial real estate 14,798 132 20,666 322 Commercial and industrial 16,252 252 11,162 146 Commercial construction 11,913 120 6,628 134 Consumer real estate 11,119 244 7,065 189 Other consumer 42 1 90 4 Total $ 54,124 $ 749 $ 45,611 $ 795 The following tables summarize investments in loans considered to be impaired and related information on those impaired loans as of the dates presented: June 30, 2016 December 31, 2015 (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 $ 12,326 $ 22,765 $ — $ 12,661 $ 13,157 $ — Commercial and industrial 11,313 12,174 — 14,417 15,220 — Commercial construction 9,918 13,494 — 10,998 14,200 — Consumer real estate 10,983 11,646 — 6,845 7,521 — Other consumer 34 41 — 111 188 — Total without a Related Allowance Recorded 44,574 60,120 — 45,032 50,286 — With a related allowance recorded: Commercial real estate — — — — — — Commercial and industrial 4,499 4,984 1,991 — — — Commercial construction 1,064 1,635 141 500 1,350 3 Consumer real estate 29 29 29 116 116 32 Other consumer 1 1 1 2 2 2 Total with a Related Allowance Recorded 5,593 6,649 2,162 618 1,468 37 Total: Commercial real estate 12,326 22,765 — 12,661 13,157 — Commercial and industrial 15,812 17,158 1,991 14,417 15,220 — Commercial construction 10,982 15,129 141 11,498 15,550 3 Consumer real estate 11,012 11,675 29 6,961 7,637 32 Other consumer 35 42 1 113 190 2 Total $ 50,167 $ 66,769 $ 2,162 $ 45,650 $ 51,754 $ 37 The following tables summarize investments in loans considered to be impaired and related information on those impaired loans for the periods presented: For the Three Months Ended June 30, 2016 June 30, 2015 (dollars in thousands) Average Recorded Investment Interest Income Recognized Average Recorded Investment Interest Income Recognized Without a related allowance recorded: Commercial real estate $ 14,619 $ 64 $ 19,733 $ 158 Commercial and industrial 10,959 98 10,782 84 Commercial construction 10,625 48 8,119 81 Consumer real estate 11,028 107 6,891 91 Other consumer 38 — 126 4 Total without a Related Allowance Recorded 47,269 317 45,651 418 With a related allowance recorded: Commercial real estate — — 420 — Commercial and industrial 4,617 31 — — Commercial construction 1,232 6 — — Consumer real estate 29 1 121 2 Other consumer 1 — 4 — Total with a Related Allowance Recorded 5,879 38 545 2 Total: Commercial real estate 14,619 64 20,153 158 Commercial and industrial 15,576 129 10,782 84 Commercial construction 11,857 54 8,119 81 Consumer real estate 11,057 108 7,012 93 Other consumer 39 — 130 4 Total $ 53,148 $ 355 $ 46,196 $ 420
Summary of Allowance for Loan Losses	The following tables detail activity in the ALL for the periods presented: Three Months Ended June 30, 2016 (dollars in thousands) Commercial Real Estate Commercial and Industrial Commercial Construction Consumer Real Estate Other Consumer Total Loans Balance at beginning of period $ 15,266 $ 14,740 $ 10,825 $ 8,261 $ 1,255 $ 50,347 Charge-offs (1,662 ) (136 ) (945 ) (290 ) (463 ) (3,496 ) Recoveries 38 217 2 134 123 514 Net (Charge-offs)/ Recoveries (1,624 ) 81 (943 ) (156 ) (340 ) (2,982 ) Provision for loan losses 2,336 (50 ) 1,819 313 430 4,848 Balance at End of Period $ 15,978 $ 14,771 $ 11,701 $ 8,418 $ 1,345 $ 52,213 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 Six Months Ended June 30, 2016 (dollars in thousands) Commercial Real Estate Commercial and Industrial Commercial Construction Consumer Real Estate Other Consumer Total Loans Balance at beginning of period $ 15,043 $ 10,853 $ 12,625 $ 8,400 $ 1,226 $ 48,147 Charge-offs (1,715 ) (2,830 ) (945 ) (522 ) (1,111 ) (7,123 ) Recoveries 398 420 3 298 207 1,326 Net (Charge-offs)/Recoveries (1,317 ) (2,410 ) (942 ) (224 ) (904 ) (5,797 ) Provision for loan losses 2,252 6,328 18 242 1,023 9,863 Balance at End of Period $ 15,978 $ 14,771 $ 11,701 $ 8,418 $ 1,345 $ 52,213 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
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, 2016 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 Commercial real estate $ — $ 15,978 $ 15,978 $ 12,326 $ 2,376,460 $ 2,388,786 Commercial and industrial 1,991 12,780 14,771 15,812 1,369,934 1,385,746 Commercial construction 141 11,560 11,701 10,982 387,140 398,122 Consumer real estate 29 8,389 8,418 11,012 1,146,459 1,157,471 Other consumer 1 1,344 1,345 35 58,104 58,139 Total $ 2,162 $ 50,051 $ 52,213 $ 50,167 $ 5,338,097 $ 5,388,264 December 31, 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 Commercial real estate $ — $ 15,043 $ 15,043 $ 12,661 $ 2,153,942 $ 2,166,603 Commercial and industrial — 10,853 10,853 14,417 1,242,413 1,256,830 Commercial construction 3 12,622 12,625 11,498 401,946 413,444 Consumer real estate 32 8,368 8,400 6,961 1,109,835 1,116,796 Other consumer 2 1,224 1,226 113 73,826 73,939 Total $ 37 $ 48,110 $ 48,147 $ 45,650 $ 4,981,962 $ 5,027,612

Derivative Instruments and He29

Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2016
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, 2016 December 31, 2015 June 30, 2016 December 31, 2015 Derivatives not Designated as Hedging Instruments: Interest Rate Swap Contracts- Commercial Loans Fair value $ 16,926 $ 11,295 $ 16,786 $ 11,276 Notional amount 249,799 245,595 249,799 245,595 Collateral posted — — 13,764 12,753 Interest Rate Lock Commitments- Mortgage Loans Fair value 643 261 — — Notional amount 17,959 9,894 — — Forward Sale Contracts- Mortgage Loans Fair value — — 204 5 Notional amount $ — $ — $ 17,073 $ 9,800
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, 2016 December 31, 2015 June 30, 2016 December 31, 2015 Derivatives not Designated as Hedging Instruments: Gross amounts recognized $ 16,926 $ 11,295 $ 16,786 $ 11,276 Gross amounts offset — — — — Net amounts presented in the Consolidated Balance Sheets 16,926 11,295 16,786 11,276 Gross amounts not offset (1) — — (13,764 ) (12,573 ) Net Amount $ 16,926 $ 11,295 $ 3,022 $ (1,297 ) (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) 2016 2015 2016 2015 Derivatives not Designated as Hedging Instruments Interest rate swap contracts—commercial loans $ 23 $ (21 ) $ 120 $ (8 ) Interest rate lock commitments—mortgage loans 117 (8 ) 382 128 Forward sale contracts—mortgage loans (132 ) 92 (199 ) 74 Total Derivatives Gain $ 8 $ 63 $ 303 $ 194

Borrowings (Tables)

Borrowings (Tables)	6 Months Ended
	Jun. 30, 2016
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, 2016 December 31, 2015 (dollars in thousands) Balance Weighted Average Rate Balance Weighted Average Rate Short-term borrowings Securities sold under repurchase agreements $ 48,479 0.01 % $ 62,086 0.01 % Short-term borrowings 550,000 0.60 % 356,000 0.52 % Total short-term borrowings 598,479 0.55 % 418,086 0.44 % Long-term borrowings Other long-term borrowings 15,888 2.92 % 117,043 0.81 % Junior subordinated debt securities 45,619 3.15 % 45,619 2.89 % Total long-term borrowings 61,507 3.09 % 162,662 1.39 % Total Borrowings $ 659,986 0.79 % $ 580,748 0.71 %

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Letters of Credit	The following table sets forth our commitments and letters of credit as of the dates presented: (dollars in thousands) June 30, 2016 December 31, 2015 Commitments to extend credit $ 1,601,779 $ 1,619,854 Standby letters of credit 80,680 97,676 Total $ 1,682,459 $ 1,717,530

Other Comprehensive Income Othe

Other Comprehensive Income Other Comprehensive Income (Tables)	6 Months Ended
	Jun. 30, 2016
Equity [Abstract]
Tax Effects of Components of Other Comprehensive Income	The following table represents the change in components of other comprehensive income (loss) for the periods presented, net of tax effects. Three Months Ended June 30, 2016 Three Months Ended June 30, 2015 (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 net unrealized gains/(losses) on securities available-for-sale $ 4,636 $ (1,622 ) $ 3,014 $ (5,872 ) $ 2,056 $ (3,816 ) Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income (1) — — — 34 (12 ) 22 Adjustment to funded status of employee benefit plans 545 (191 ) 354 463 (162 ) 301 Other Comprehensive Income/(Loss) $ 5,181 $ (1,813 ) $ 3,368 $ (5,375 ) $ 1,882 $ (3,493 ) (1) Reclassification adjustments are comprised of realized security gains or losses. The realized gains or losses 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, 2016 Six Months Ended June 30, 2015 (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 net unrealized gains/(losses) on securities available-for-sale $ 13,669 $ (4,784 ) $ 8,885 $ (889 ) $ 311 $ (578 ) Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income (1) — — — 34 (12 ) 22 Adjustment to funded status of employee benefit plans 4,345 (1,521 ) 2,824 1,192 (324 ) 868 Other Comprehensive Income $ 18,014 $ (6,305 ) $ 11,709 $ 337 $ (25 ) $ 312 (1) Reclassification adjustments are comprised of realized security gains or losses. The realized gains or losses 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 Bene

Employee Benefits Employee Benefits (Tables)	6 Months Ended
	Jun. 30, 2016
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) 2016 2015 2016 2015 Components of Net Periodic Pension Cost Service cost—benefits earned during the period $ — $ 672 $ 474 $ 1,344 Interest cost on projected benefit obligation 1,036 1,100 2,101 2,200 Expected return on plan assets (1,434 ) (1,807 ) (2,893 ) (3,614 ) Amortization of prior service credit (35 ) (35 ) (70 ) (70 ) Recognized net actuarial loss 526 468 1,070 936 Net Periodic Pension Expense $ 93 $ 398 $ 682 $ 796

Segments (Tables)

Segments (Tables)	6 Months Ended
	Jun. 30, 2016
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, 2016 December 31, 2015 Community Banking $ 6,661,869 $ 6,305,046 Insurance 8,336 9,619 Wealth Management 4,000 3,689 Total Assets $ 6,674,205 $ 6,318,354
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, 2016 and 2015 . 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, 2016 (dollars in thousands) Community Banking Insurance Wealth Management Eliminations Consolidated Interest income $ 55,839 $ 1 $ 117 $ (107 ) $ 55,850 Interest expense 6,213 — — (71 ) 6,142 Net interest income 49,626 1 117 (36 ) 49,708 Provision for loan losses 4,848 — — — 4,848 Noninterest income 8,589 1,093 2,627 139 12,448 Noninterest expense 29,462 1,103 2,437 103 33,105 Depreciation expense 1,224 11 4 — 1,239 Amortization of intangible assets 391 12 6 — 409 Provision for income taxes 5,404 (12 ) 104 — 5,496 Net Income (Loss) $ 16,886 $ (20 ) $ 193 $ — $ 17,059 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 Six Months Ended June 30, 2016 (dollars in thousands) Community Banking Insurance Wealth Management Eliminations Consolidated Interest income $ 110,857 $ 1 $ 245 $ (233 ) $ 110,870 Interest expense 11,651 — — (127 ) 11,524 Net interest income 99,206 1 245 (106 ) 99,346 Provision for loan losses 9,863 — — — 9,863 Noninterest income 18,919 2,717 5,373 1,256 28,265 Noninterest expense 61,610 2,358 4,743 1,150 69,861 Depreciation expense 2,410 21 8 — 2,439 Amortization of intangible assets 831 25 13 — 869 Provision for income taxes 11,018 110 299 — 11,427 Net Income $ 32,393 $ 204 $ 555 $ — $ 33,152 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

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Detail)	Jun. 30, 2016
Minimum
Summary Of Significant Accounting Policies [Line Items]
Percentage of outstanding common stock of investees accounted for using equity method of accounting	20.00%
Maximum
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 ($)	Mar. 04, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Mar. 04, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill		$ 291,670,000		$ 291,670,000			$ 291,764,000
Merger related expenses		0	$ 866,000	0	$ 3,167,000
Professional services and legal		1,047,000	801,000	1,994,000	1,324,000
Integrity Bancshares, Inc.
Business Acquisition [Line Items]
Business acquisition, percentage of voting interests acquired	100.00%
Business acquisition, cash per share offered in exchange of share (in dollars per share)	$ 52.50
Shares of S&T offered for each share of Integrity (shares)	2.0627
Fair value of total consideration	$ 172,000,000					$ 171,979,000
Cash	$ 29,500,000					29,510,000
S&T common shares issued (shares)	4,933,115
S&T common shares issued, fair value (in dollars per share)	$ 28.88
Purchase accounting adjustments, increase to goodwill						1,100,000
Purchase accounting adjustments, decrease to deferred taxes						300,000
Goodwill						115,850,000
Carryover of allowance for loan losses	$ 0
Fair value of loans acquired	788,700,000					788,687,000
Discount on loans acquired	14,800,000
Merger related expenses		$ 0	900,000	$ 0	3,200,000
Data processing, contract termination and conversion cost expenses			400,000		1,300,000
Professional services and legal			100,000		1,200,000
Severance payments			100,000		400,000
Other expenses			$ 300,000		$ 300,000
Integrity Bancshares, Inc. | Commercial and Industrial
Business Acquisition [Line Items]
Fair value of loans acquired	184,200,000
Integrity Bancshares, Inc. | Commercial Real Estate
Business Acquisition [Line Items]
Fair value of loans acquired	331,600,000
Integrity Bancshares, Inc. | Commercial Construction
Business Acquisition [Line Items]
Fair value of loans acquired	92,400,000
Integrity Bancshares, Inc. | Residential Mortgage
Business Acquisition [Line Items]
Fair value of loans acquired	116,900,000
Integrity Bancshares, Inc. | Home Equity
Business Acquisition [Line Items]
Fair value of loans acquired	25,600,000
Integrity Bancshares, Inc. | Installment and Other Consumer
Business Acquisition [Line Items]
Fair value of loans acquired	36,100,000
Integrity Bancshares, Inc. | Consumer Construction
Business Acquisition [Line Items]
Fair value of loans acquired	$ 1,900,000
Integrity Bancshares, Inc. | Land
Business Acquisition [Line Items]
Purchase accounting adjustments, decrease to land						$ 800,000

Business Combinations - Conside

Business Combinations - Consideration, Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 04, 2015	Mar. 04, 2016	Jun. 30, 2016	Dec. 31, 2015
Fair Value of Liabilities Assumed
Goodwill			$ 291,670	$ 291,764
Integrity Bancshares, Inc.
Business Acquisition [Line Items]
Cash	$ 29,500	$ 29,510
Common stock		142,469
Fair Value of Total Consideration	172,000	171,979
Fair Value of Assets Acquired
Cash and cash equivalents		13,163
Securities and other investments		11,502
Loans	$ 788,700	788,687
Bank owned life insurance		15,974
Premises and equipment		10,855
Core deposit intangible		5,713
Other assets		19,088
Total Assets Acquired		864,982
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		56,129
Goodwill		$ 115,850

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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator for Earnings per Share-Basic:
Net income	$ 17,059	$ 18,188	$ 33,152	$ 31,023
Less: Income allocated to participating shares	60	79	101	123
Net Income Allocated to Shareholders	16,999	18,109	33,051	30,900
Numerator for Earnings per Share-Diluted:
Net income	17,059	18,188	33,152	31,023
Net Income Available to Shareholders	$ 17,059	$ 18,188	$ 33,152	$ 31,023
Denominators:
Weighted Average Shares Outstanding-Basic	34,674,712	34,652,895	34,666,773	32,951,936
Add: Potentially dilutive shares	89,853	28,283	80,890	36,359
Denominator for Treasury Stock Method-Diluted (in shares)	34,764,565	34,681,178	34,747,663	32,988,295
Weighted Average Shares Outstanding-Basic	34,674,712	34,652,895	34,666,773	32,951,936
Add: Average participating shares outstanding	122,160	151,134	105,794	131,563
Denominator for Two-Class Method-Diluted (in shares)	34,796,872	34,804,029	34,772,567	33,083,499
Earnings per share—basic (in dollars per share)	$ 0.49	$ 0.52	$ 0.96	$ 0.94
Earnings per share—diluted (in dollars per share)	0.49	0.52	0.95	0.94
Anti-dilutive warrants - exercise price (in dollars per share)	$ 31.53	$ 31,530	$ 31.53	$ 31,530
Warrants
Denominators:
Anti-dilutive excluded from potentially dilutive shares	517,012	517,012	517,012	517,012
Stock Options
Denominators:
Anti-dilutive excluded from potentially dilutive shares	0	155,500	0	155,500
Restricted Stock
Denominators:
Anti-dilutive excluded from potentially dilutive shares	144,998	122,851	117,796	95,204

Fair Value Measurement - Assets

Fair Value Measurement - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
ASSETS
Total securities available-for-sale	$ 683,479	$ 660,963
US Treasury Securities
ASSETS
Total securities available-for-sale	15,103	14,941
Obligations of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	262,265	263,303
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	143,262	128,835
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	38,014	40,125
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	81,668	69,204
Obligations of States and Political Subdivisions
ASSETS
Total securities available-for-sale	134,250	134,886
Marketable Equity Securities
ASSETS
Total securities available-for-sale	8,917	9,669
Fair Value Measurements, Recurring
ASSETS
Total securities available-for-sale	683,479	660,963
Trading securities held in a Rabbi Trust	4,196	4,021
Total securities	687,675	664,984
Total Assets	705,244	676,540
LIABILITIES
Total Liabilities	16,990	11,281
Fair Value Measurements, Recurring | Interest Rate Swaps
ASSETS
Derivative financial assets	16,926	11,295
LIABILITIES
Derivative financial liabilities	16,786	11,276
Fair Value Measurements, Recurring | Interest Rate Lock Commitments
ASSETS
Derivative financial assets	643	261
Fair Value Measurements, Recurring | Forward Sale Contracts
LIABILITIES
Derivative financial liabilities	204	5
Fair Value Measurements, Recurring | US Treasury Securities
ASSETS
Total securities available-for-sale	15,103	14,941
Fair Value Measurements, Recurring | Obligations of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	262,265	263,303
Fair Value Measurements, Recurring | Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	143,262	128,835
Fair Value Measurements, Recurring | Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	38,014	40,125
Fair Value Measurements, Recurring | Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	81,668	69,204
Fair Value Measurements, Recurring | Obligations of States and Political Subdivisions
ASSETS
Total securities available-for-sale	134,250	134,886
Fair Value Measurements, Recurring | Marketable Equity Securities
ASSETS
Total securities available-for-sale	8,917	9,669
Fair Value Measurements, Recurring | Level 1
ASSETS
Total securities available-for-sale	0	0
Trading securities held in a Rabbi Trust	4,196	4,021
Total securities	4,196	4,021
Total Assets	4,196	4,021
LIABILITIES
Total Liabilities	0	0
Fair Value Measurements, Recurring | Level 1 | Interest Rate Swaps
ASSETS
Derivative financial assets	0	0
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements, Recurring | Level 1 | Interest Rate Lock Commitments
ASSETS
Derivative financial assets	0	0
Fair Value Measurements, Recurring | Level 1 | Forward Sale Contracts
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements, Recurring | Level 1 | US Treasury Securities
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 1 | Obligations of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 1 | Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 1 | Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 1 | Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 1 | Obligations of States and Political Subdivisions
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 1 | Marketable Equity Securities
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 2
ASSETS
Total securities available-for-sale	683,479	660,963
Trading securities held in a Rabbi Trust	0	0
Total securities	683,479	660,963
Total Assets	701,048	672,519
LIABILITIES
Total Liabilities	16,990	11,281
Fair Value Measurements, Recurring | Level 2 | Interest Rate Swaps
ASSETS
Derivative financial assets	16,926	11,295
LIABILITIES
Derivative financial liabilities	16,786	11,276
Fair Value Measurements, Recurring | Level 2 | Interest Rate Lock Commitments
ASSETS
Derivative financial assets	643	261
Fair Value Measurements, Recurring | Level 2 | Forward Sale Contracts
LIABILITIES
Derivative financial liabilities	204	5
Fair Value Measurements, Recurring | Level 2 | US Treasury Securities
ASSETS
Total securities available-for-sale	15,103	14,941
Fair Value Measurements, Recurring | Level 2 | Obligations of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	262,265	263,303
Fair Value Measurements, Recurring | Level 2 | Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	143,262	128,835
Fair Value Measurements, Recurring | Level 2 | Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	38,014	40,125
Fair Value Measurements, Recurring | Level 2 | Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	81,668	69,204
Fair Value Measurements, Recurring | Level 2 | Obligations of States and Political Subdivisions
ASSETS
Total securities available-for-sale	134,250	134,886
Fair Value Measurements, Recurring | Level 2 | Marketable Equity Securities
ASSETS
Total securities available-for-sale	8,917	9,669
Fair Value Measurements, Recurring | Level 3
ASSETS
Total securities available-for-sale	0	0
Trading securities held in a Rabbi Trust	0	0
Total securities	0	0
Total Assets	0	0
LIABILITIES
Total Liabilities	0	0
Fair Value Measurements, Recurring | Level 3 | Interest Rate Swaps
ASSETS
Derivative financial assets	0	0
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements, Recurring | Level 3 | Interest Rate Lock Commitments
ASSETS
Derivative financial assets	0	0
Fair Value Measurements, Recurring | Level 3 | Forward Sale Contracts
LIABILITIES
Derivative financial liabilities	0	0
Fair Value Measurements, Recurring | Level 3 | US Treasury Securities
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 3 | Obligations of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 3 | Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 3 | Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 3 | Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 3 | Obligations of States and Political Subdivisions
ASSETS
Total securities available-for-sale	0	0
Fair Value Measurements, Recurring | Level 3 | Marketable Equity Securities
ASSETS
Total securities available-for-sale	$ 0	$ 0

Fair Value Measurement - Asse40

Fair Value Measurement - Assets Measured at Estimated Fair Value on Nonrecurring Basis by Fair Value Hierarchy (Detail) - Fair Value, Measurements, Nonrecurring - USD ($)		Jun. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value on a nonrecurring basis		$ 0	$ 0
ASSETS
Impaired loans	[1]	14,343,000	9,373,000
Other real estate owned	[1]	149,000	158,000
Mortgage servicing rights	[1]	3,094,000	3,396,000
Total Assets	[1]	17,586,000	12,927,000
Level 1
ASSETS
Impaired loans	[1]	0	0
Other real estate owned	[1]	0	0
Mortgage servicing rights	[1]	0	0
Total Assets	[1]	0	0
Level 2
ASSETS
Impaired loans	[1]	0	0
Other real estate owned	[1]	0	0
Mortgage servicing rights	[1]	0	0
Total Assets	[1]	0	0
Level 3
ASSETS
Impaired loans	[1]	14,343,000	9,373,000
Other real estate owned	[1]	149,000	158,000
Mortgage servicing rights	[1]	3,094,000	3,396,000
Total Assets	[1]	$ 17,586,000	$ 12,927,000
[1]	This table represents only the nonrecurring items that are recorded at fair value in our financial statements.

Fair Value Measurement - Carryi

Fair Value Measurement - Carrying Values and Fair Values of Financial Instruments (Detail) - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015
ASSETS
Securities available-for-sale		$ 683,479	$ 660,963
FHLB and other restricted stock		27,755	23,032
LIABILITIES
Junior subordinated debt securities		45,619	45,619
Carrying Value
ASSETS
Cash and due from banks, including interest-bearing deposits	[1]	94,991	99,399
Securities available-for-sale	[1]	683,479	660,963
Loans held for sale	[1]	11,999	35,321
Portfolio loans, net of unearned income	[1]	5,388,264	5,027,612
Bank owned life insurance	[1]	70,991	70,175
FHLB and other restricted stock	[1]	27,755	23,032
Trading securities held in a Rabbi Trust	[1]	4,196	4,021
Mortgage servicing rights	[1]	3,094	3,237
LIABILITIES
Deposits	[1]	5,120,318	4,876,611
Securities sold under repurchase agreements	[1]	48,479	62,086
Short-term borrowings	[1]	550,000	356,000
Long-term borrowings	[1]	15,888	117,043
Junior subordinated debt securities	[1]	45,619	45,619
Carrying Value | Interest Rate Swaps
ASSETS
Derivative financial assets	[1]	16,926	11,295
LIABILITIES
Derivative financial liabilities	[1]	16,786	11,276
Carrying Value | Interest Rate Lock Commitments
ASSETS
Derivative financial assets	[1]	643	261
Carrying Value | Forward Sale Contracts
LIABILITIES
Derivative financial liabilities	[1]	204	5
Fair Value Measurements
ASSETS
Cash and due from banks, including interest-bearing deposits		94,991	99,399
Securities available-for-sale		683,479	660,963
Loans held for sale		12,485	35,500
Portfolio loans, net of unearned income		5,380,012	5,001,004
Bank owned life insurance		70,991	70,175
FHLB and other restricted stock		27,755	23,032
Trading securities held in a Rabbi Trust		4,196	4,021
Mortgage servicing rights		3,094	3,396
LIABILITIES
Deposits		5,127,474	4,881,718
Securities sold under repurchase agreements		48,479	62,086
Short-term borrowings		550,000	356,000
Long-term borrowings		16,843	117,859
Junior subordinated debt securities		45,619	45,619
Fair Value Measurements | Interest Rate Swaps
ASSETS
Derivative financial assets		16,926	11,295
LIABILITIES
Derivative financial liabilities		16,786	11,276
Fair Value Measurements | Interest Rate Lock Commitments
ASSETS
Derivative financial assets		643	261
Fair Value Measurements | Forward Sale Contracts
LIABILITIES
Derivative financial liabilities		204	5
Fair Value Measurements | Level 1
ASSETS
Cash and due from banks, including interest-bearing deposits		94,991	99,399
Securities available-for-sale		0	0
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		4,196	4,021
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 | Level 1 | Interest Rate Swaps
ASSETS
Derivative financial assets		0	0
LIABILITIES
Derivative financial liabilities		0	0
Fair Value Measurements | Level 1 | Interest Rate Lock Commitments
ASSETS
Derivative financial assets		0	0
Fair Value Measurements | Level 1 | Forward Sale Contracts
LIABILITIES
Derivative financial liabilities		0	0
Fair Value Measurements | Level 2
ASSETS
Cash and due from banks, including interest-bearing deposits		0	0
Securities available-for-sale		683,479	660,963
Loans held for sale		0	0
Portfolio loans, net of unearned income		0	0
Bank owned life insurance		70,991	70,175
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 | Level 2 | Interest Rate Swaps
ASSETS
Derivative financial assets		16,926	11,295
LIABILITIES
Derivative financial liabilities		16,786	11,276
Fair Value Measurements | Level 2 | Interest Rate Lock Commitments
ASSETS
Derivative financial assets		643	261
Fair Value Measurements | Level 2 | Forward Sale Contracts
LIABILITIES
Derivative financial liabilities		204	5
Fair Value Measurements | Level 3
ASSETS
Cash and due from banks, including interest-bearing deposits		0	0
Securities available-for-sale		0	0
Loans held for sale		12,485	35,500
Portfolio loans, net of unearned income		5,380,012	5,001,004
Bank owned life insurance		0	0
FHLB and other restricted stock		27,755	23,032
Trading securities held in a Rabbi Trust		0	0
Mortgage servicing rights		3,094	3,396
LIABILITIES
Deposits		5,127,474	4,881,718
Securities sold under repurchase agreements		48,479	62,086
Short-term borrowings		550,000	356,000
Long-term borrowings		16,843	117,859
Junior subordinated debt securities		45,619	45,619
Fair Value Measurements | Level 3 | Interest Rate Swaps
ASSETS
Derivative financial assets		0	0
LIABILITIES
Derivative financial liabilities		0	0
Fair Value Measurements | Level 3 | Interest Rate Lock Commitments
ASSETS
Derivative financial assets		0	0
Fair Value Measurements | Level 3 | Forward Sale Contracts
LIABILITIES
Derivative financial liabilities		$ 0	$ 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, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 659,629	$ 650,782
Gross Unrealized Gains	23,851	11,897
Gross Unrealized Losses	(1)	(1,716)
Fair Value	683,479	660,963
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	14,934	14,914
Gross Unrealized Gains	169	27
Gross Unrealized Losses		0
Fair Value	15,103	14,941
Obligations of U.S. Government Corporations and Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	256,526	262,045
Gross Unrealized Gains	5,739	1,825
Gross Unrealized Losses	0	(567)
Fair Value	262,265	263,303
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	139,532	128,458
Gross Unrealized Gains	3,730	693
Gross Unrealized Losses	0	(316)
Fair Value	143,262	128,835
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	36,396	39,185
Gross Unrealized Gains	1,618	1,091
Gross Unrealized Losses	0	(151)
Fair Value	38,014	40,125
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	79,517	69,697
Gross Unrealized Gains	2,151	183
Gross Unrealized Losses	0	(676)
Fair Value	81,668	69,204
Obligations of States and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	125,145	128,904
Gross Unrealized Gains	9,105	5,988
Gross Unrealized Losses	0	(6)
Fair Value	134,250	134,886
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	652,050	643,203
Gross Unrealized Gains	22,512	9,807
Gross Unrealized Losses	0	(1,716)
Fair Value	674,562	651,294
Marketable Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,579	7,579
Gross Unrealized Gains	1,339	2,090
Gross Unrealized Losses	(1)	0
Fair Value	$ 8,917	$ 9,669

Securities Available-for-Sale43

Securities Available-for-Sale - Fair Value and Age of Gross Unrealized Losses by Investment Category (Detail)	Jun. 30, 2016USD ($)security	Dec. 31, 2015USD ($)security
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	1	23
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 70,000	$ 213,997,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ (1,000)	$ (1,302,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	0	3
Available-for-sale Securities, 12 Months or More, Fair Value	$ 0	$ 24,014,000
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ 0	$ (414,000)
Available-for-sale, Securities, Number of Positions | security	1	26
Available-for-sale Securities, Fair Value, Total	$ 70,000	$ 238,011,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (1,000)	$ (1,716,000)
US Treasury Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	0
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 0
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ 0
Available-for-sale, Securities, Number of Positions | security	0
Available-for-sale Securities, Fair Value, Total	$ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0
Obligations of U.S. Government Corporations and Agencies
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	0	10
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 0	$ 88,584,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ (379,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	0	2
Available-for-sale Securities, 12 Months or More, Fair Value	$ 0	$ 14,542,000
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ 0	$ (188,000)
Available-for-sale, Securities, Number of Positions | security	0	12
Available-for-sale Securities, Fair Value, Total	$ 0	$ 103,126,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ (567,000)
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	0	6
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 0	$ 61,211,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ (316,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	0	0
Available-for-sale Securities, 12 Months or More, Fair Value	$ 0	$ 0
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ 0	$ 0
Available-for-sale, Securities, Number of Positions | security	0	6
Available-for-sale Securities, Fair Value, Total	$ 0	$ 61,211,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ (316,000)
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	0	1
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 0	$ 7,993,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ (151,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	0	0
Available-for-sale Securities, 12 Months or More, Fair Value	$ 0	$ 0
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ 0	$ 0
Available-for-sale, Securities, Number of Positions | security	0	1
Available-for-sale Securities, Fair Value, Total	$ 0	$ 7,993,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ (151,000)
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	0	5
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 0	$ 50,839,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ (450,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	0	1
Available-for-sale Securities, 12 Months or More, Fair Value	$ 0	$ 9,472,000
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ 0	$ (226,000)
Available-for-sale, Securities, Number of Positions | security	0	6
Available-for-sale Securities, Fair Value, Total	$ 0	$ 60,311,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ (676,000)
Obligations of States and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	0	1
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 0	$ 5,370,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ (6,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	0	0
Available-for-sale Securities, 12 Months or More, Fair Value	$ 0	$ 0
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ 0	$ 0
Available-for-sale, Securities, Number of Positions | security	0	1
Available-for-sale Securities, Fair Value, Total	$ 0	$ 5,370,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ (6,000)
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	0	23
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 0	$ 213,997,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ 0	$ (1,302,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	0	3
Available-for-sale Securities, 12 Months or More, Fair Value	$ 0	$ 24,014,000
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ 0	$ (414,000)
Available-for-sale, Securities, Number of Positions | security	0	26
Available-for-sale Securities, Fair Value, Total	$ 0	$ 238,011,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 0	$ (1,716,000)
Marketable Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale, Securities, Less Than 12 Months, Number of Positions | security	1
Available-for-sale Securities, Less Than 12 Months, Fair Value	$ 70,000
Available-for-sale Securities, Less Than 12 Months, Unrealized Losses	$ (1,000)
Available-for-sale, Securities, 12 Months or More, Number of Positions | security	0
Available-for-sale Securities, 12 Months or More, Fair Value	$ 0
Available-for-sale Securities, 12 Months or More, Unrealized Losses	$ 0
Available-for-sale, Securities, Number of Positions | security	1	1
Available-for-sale Securities, Fair Value, Total	$ 70,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ (1,000)	$ 0

Securities Available-for-Sale44

Securities Available-for-Sale - Additional Information (Detail)	Jun. 30, 2016USD ($)security	Dec. 31, 2015USD ($)security
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses on securities	$ (1,000)	$ (1,716,000)
Number of securities in unrealized loss position | security	1	26
Carrying values of pledged securities	$ 252,500,000	$ 278,400,000
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses on securities	$ 0	$ (1,716,000)
Number of securities in unrealized loss position | security	0	26
Marketable Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses on securities	$ (1,000)	$ 0
Number of securities in unrealized loss position | security	1	1

Securities Available-for-Sale45

Securities Available-for-Sale - Unrealized Gains (Losses) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Total unrealized gains/(losses) on securities available for sale, Gross Unrealized Gains	$ 23,851	$ 11,897
Total unrealized gains/(losses) on securities available for sale, Gross Unrealized Losses	(1)	(1,716)
Total unrealized gains/(losses) on securities available for sale, Net Unrealized Gains/(Losses)	23,850	10,181
Income tax expense/(benefit), Gross Unrealized Gains	8,347	4,164
Income tax expense/(benefit), Gross Unrealized Losses	0	(601)
Income tax expense/(benefit), Net Unrealized Gains/(Losses)	8,347	3,563
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Gross Unrealized Gains	15,504	7,733
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Gross Unrealized Losses	(1)	(1,115)
Net unrealized gains/(losses), net of tax included in accumulated other comprehensive income/(loss), Net Unrealized Gains/(Losses)	$ 15,503	$ 6,618

Securities Available-for-Sale46

Securities Available-for-Sale - Amortized Cost and Fair Value of Available-for-Sale Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 659,629	$ 650,782
Fair Value	683,479	660,963
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	46,370
Due after one year through five years, Amortized Cost	211,742
Due after five years through ten years, Amortized Cost	66,087
Due after ten years, Amortized Cost	72,406
Available-for-sale Securities, Debt Maturities, Amortized Cost	396,605
Due in one year or less, Fair Value	46,509
Due after one year through five years, Fair Value	217,558
Due after five years through ten years, Fair Value	69,318
Due after ten years, Fair Value	78,233
Fair Value, Debt securities	411,618
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	139,532	128,458
Fair Value	143,262	128,835
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	36,396	39,185
Fair Value	38,014	40,125
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	79,517	69,697
Fair Value	81,668	69,204
Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	652,050	643,203
Fair Value	674,562	651,294
Marketable Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,579	7,579
Fair Value	$ 8,917	$ 9,669

Loans and Loans Held for Sale -

Loans and Loans Held for Sale - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2016USD ($)contract	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)contract	Jun. 30, 2015USD ($)	Dec. 31, 2015USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 4,500,000		$ 4,500,000		$ 3,200,000
Loans, net of discount related to purchase accounting adjustments	9,000,000		9,000,000		$ 10,900,000
Maximum concentration of commercial real estate and commercial construction portfolio in loans (in excess of)					7.00%
Decrease in loans held for sale during the period			23,300,000
Gain on sale of credit card portfolio	0	$ 0	2,066,000	$ 0
Commitment to lend additional funds on troubled debt restructuring	$ 700,000		$ 700,000
Minimum period of loan payment defaults following restructure for TDRs to be in default			90 days
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans modified not considered to be troubled debt restructuring | contract	1		3
Loans modified not considered to be troubled debt restructuring	$ 6,500,000		$ 8,700,000
Installment and Other Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Decrease in loans held for sale during the period			22,900,000
Gain on sale of credit card portfolio			$ 2,100,000
Commercial Real Estate and Commercial Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Out of market exposure of combined portfolio (percent)	5.30%		5.30%		5.80%
Percentage of total loans out-of-state excluding contiguous states	2.70%		2.70%		3.00%
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans modified not considered to be troubled debt restructuring | contract	1		1
Loans modified not considered to be troubled debt restructuring	$ 500,000		$ 500,000
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of commercial loans in total portfolio loans	77.00%		77.00%		76.00%
Commercial Loans	$ 4,172,654,000		$ 4,172,654,000		$ 3,836,877,000
Concentration Risk, Product			0	0
Maximum concentration of commercial real estate and commercial construction portfolio in loans (in excess of)	7.00%		7.00%		7.00%
Commercial | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans	$ 1,385,746,000		$ 1,385,746,000		$ 1,256,830,000
Commercial | Commercial Real Estate and Commercial Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans	$ 2,800,000,000		$ 2,800,000,000
Combined percentage of commercial real estate and commercial construction in total commercial loans	67.00%		67.00%		67.00%
Combined percentage of commercial real estate and commercial construction in total portfolio loans	52.00%		52.00%		51.00%
Commercial | Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans	$ 2,388,786,000		$ 2,388,786,000		$ 2,166,603,000

Loans and Loans Held for Sale48

Loans and Loans Held for Sale - Composition of Loans (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Composition of the loans
Portfolio loans, net of unearned income	$ 5,388,264	$ 5,027,612
Loans held for sale	11,999	35,321
Total Loans	5,400,263	5,062,933
Commercial and Industrial
Composition of the loans
Portfolio loans, net of unearned income	1,385,746	1,256,830
Total Loans	1,385,746	1,256,830
Commercial Real Estate
Composition of the loans
Portfolio loans, net of unearned income	2,388,786	2,166,603
Total Loans	2,388,786	2,166,603
Commercial Construction
Composition of the loans
Portfolio loans, net of unearned income	398,122	413,444
Total Loans	398,122	413,444
Residential Mortgage
Composition of the loans
Total Loans	671,665	639,372
Home Equity
Composition of the loans
Total Loans	480,204	470,845
Installment and Other Consumer
Composition of the loans
Total Loans	58,139	73,939
Commercial
Composition of the loans
Portfolio loans, net of unearned income	4,172,654	3,836,877
Commercial | Commercial and Industrial
Composition of the loans
Portfolio loans, net of unearned income	1,385,746	1,256,830
Commercial | Commercial Real Estate
Composition of the loans
Portfolio loans, net of unearned income	2,388,786	2,166,603
Commercial | Commercial Construction
Composition of the loans
Portfolio loans, net of unearned income	398,122	413,444
Consumer
Composition of the loans
Portfolio loans, net of unearned income	1,215,610	1,190,735
Consumer | Commercial Construction
Composition of the loans
Portfolio loans, net of unearned income	5,602	6,579
Consumer | Residential Mortgage
Composition of the loans
Portfolio loans, net of unearned income	671,665	639,372
Consumer | Home Equity
Composition of the loans
Portfolio loans, net of unearned income	480,204	470,845
Consumer | Installment and Other Consumer
Composition of the loans
Portfolio loans, net of unearned income	$ 58,139	$ 73,939

Loans and Loans Held for Sale49

Loans and Loans Held for Sale - Summary of Restructured Loans (Detail) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
		Jun. 30, 2016USD ($)tdr	Jun. 30, 2015USD ($)tdr	Jun. 30, 2016USD ($)tdr	Jun. 30, 2015USD ($)tdr	Dec. 31, 2015USD ($)
Receivables [Abstract]
Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Period Increase (Decrease)				$ 23,300
Gain on sale of credit card portfolio		$ 0	$ 0	$ 2,066	$ 0
Financing Receivable, Modifications [Line Items]
Threshold period of satisfactory performance for troubled debt restructuring to be restored to accruing status				6 months
Restructured loans	[1]	$ 8,193	$ 796	$ 10,771	$ 5,381
Number of troubled debt restructuring loans returned back to accruing status | tdr		0	6	0	6
Amount of troubled debt restructuring loans returned back to accruing status			$ 300		$ 300
Performing Financial Instruments
Financing Receivable, Modifications [Line Items]
Restructured loans				$ 20,598		$ 23,955
Performing Financial Instruments | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Restructured loans				6,241		6,321
Performing Financial Instruments | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Restructured loans				4,263		6,822
Performing Financial Instruments | Commercial Construction
Financing Receivable, Modifications [Line Items]
Restructured loans				4,351		5,013
Performing Financial Instruments | Residential Mortgage
Financing Receivable, Modifications [Line Items]
Restructured loans				2,493		2,590
Performing Financial Instruments | Home Equity
Financing Receivable, Modifications [Line Items]
Restructured loans				3,225		3,184
Performing Financial Instruments | Installment and Other Consumer
Financing Receivable, Modifications [Line Items]
Restructured loans				25		25
Nonperforming Financial Instruments
Financing Receivable, Modifications [Line Items]
Restructured loans				15,028		7,659
Nonperforming Financial Instruments | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Restructured loans				2,535		1,570
Nonperforming Financial Instruments | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Restructured loans				4,369		3,548
Nonperforming Financial Instruments | Commercial Construction
Financing Receivable, Modifications [Line Items]
Restructured loans				2,820		1,265
Nonperforming Financial Instruments | Residential Mortgage
Financing Receivable, Modifications [Line Items]
Restructured loans				4,411		665
Nonperforming Financial Instruments | Home Equity
Financing Receivable, Modifications [Line Items]
Restructured loans				882		523
Nonperforming Financial Instruments | Installment and Other Consumer
Financing Receivable, Modifications [Line Items]
Restructured loans				11		88
Financing Receivable
Financing Receivable, Modifications [Line Items]
Restructured loans				35,626		31,614
Financing Receivable | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Restructured loans				8,776		7,891
Financing Receivable | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Restructured loans				8,632		10,370
Financing Receivable | Commercial Construction
Financing Receivable, Modifications [Line Items]
Restructured loans				7,171		6,278
Financing Receivable | Residential Mortgage
Financing Receivable, Modifications [Line Items]
Restructured loans				6,904		3,255
Financing Receivable | Home Equity
Financing Receivable, Modifications [Line Items]
Restructured loans				4,107		3,707
Financing Receivable | Installment and Other Consumer
Financing Receivable, Modifications [Line Items]
Restructured loans				$ 36		$ 113
[1]	(1) Excludes loans that were fully paid off or fully charged-off by period end. The pre-modification balance represents the balance outstanding prior to modification. The post-modification balance represents the outstanding balance at period end.

Loans and Loans Held for Sale50

Loans and Loans Held for Sale - Restructured Loans During Periods Presented (Detail) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2016USD ($)contract	Jun. 30, 2015USD ($)contract		Jun. 30, 2016USD ($)contract		Jun. 30, 2015USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		22	7		38		27
Pre-Modification Outstanding Recorded Investment	[1]	$ 10,707	$ 796		$ 13,353		$ 5,408
Post-Modification Outstanding Recorded Investment	[1]	8,193	796		10,771		5,381
Total Difference in Recorded Investment		$ (2,514)	$ 0		$ (2,582)		$ (27)
Principal forgiveness
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		0	1		0		1
Pre-Modification Outstanding Recorded Investment	[1]	$ 0	$ 400		$ 0		$ 400
Post-Modification Outstanding Recorded Investment	[1]	$ 0	400		0		400
Total Difference in Recorded Investment			$ 0		$ 0		$ 0
Principal forgiveness | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		0	1		0		1
Pre-Modification Outstanding Recorded Investment	[1]	$ 0	$ 400		$ 0		$ 400
Post-Modification Outstanding Recorded Investment	[1]	0	400		$ 0		$ 400
Total Difference in Recorded Investment		$ 0	$ 0
Principal deferral
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		7	0		8		9
Pre-Modification Outstanding Recorded Investment	[1]	$ 8,979	$ 0		$ 9,026		$ 3,616
Post-Modification Outstanding Recorded Investment	[1]	6,528	0		6,574		3,615
Total Difference in Recorded Investment		$ (2,451)	$ 0		$ (2,452)		$ (1)
Principal deferral | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		5	0		5		6
Pre-Modification Outstanding Recorded Investment	[1]	$ 985	$ 0		$ 985		$ 661
Post-Modification Outstanding Recorded Investment	[1]	985	0		$ 985		$ 661
Total Difference in Recorded Investment		$ 0	$ 0
Principal deferral | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		1	0		1		2
Pre-Modification Outstanding Recorded Investment		$ 4,721	$ 0		$ 4,721	[1]	$ 2,851	[1]
Post-Modification Outstanding Recorded Investment		2,270	0		2,270	[1]	2,851	[1]
Total Difference in Recorded Investment		$ (2,451)	$ 0		$ (2,451)		$ 0
Principal deferral | Commercial Construction
Financing Receivable, Modifications [Line Items]
Number of Loans | contract					0		1
Pre-Modification Outstanding Recorded Investment	[1]				$ 0		$ 104
Post-Modification Outstanding Recorded Investment	[1]				0		103
Total Difference in Recorded Investment					$ 0		$ (1)
Principal deferral | Residential Mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		1	0		1		0
Pre-Modification Outstanding Recorded Investment	[1]	$ 3,273	$ 0		$ 3,273		$ 0
Post-Modification Outstanding Recorded Investment	[1]	3,273	0		3,273		0
Total Difference in Recorded Investment		$ 0	$ 0		$ 0		$ 0
Principal deferral | Home Equity
Financing Receivable, Modifications [Line Items]
Number of Loans | contract					1		0
Pre-Modification Outstanding Recorded Investment	[1]				$ 47		$ 0
Post-Modification Outstanding Recorded Investment	[1]				46		0
Total Difference in Recorded Investment					$ (1)		$ 0
Chapter 7 bankruptcy
Financing Receivable, Modifications [Line Items]
Number of Loans | contract	[2]	7	4		16		13
Pre-Modification Outstanding Recorded Investment	[1],[2]	$ 154	$ 171		$ 1,328		$ 316
Post-Modification Outstanding Recorded Investment	[1],[2]	146	171		1,283		305
Total Difference in Recorded Investment	[2]	$ (8)	$ 0		$ (45)		$ (11)
Chapter 7 bankruptcy | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | contract	[2]				0		1
Pre-Modification Outstanding Recorded Investment	[1],[2]				$ 0		$ 3
Post-Modification Outstanding Recorded Investment	[1],[2]				0		1
Total Difference in Recorded Investment	[2]				$ 0		$ (2)
Chapter 7 bankruptcy | Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of Loans | contract	[2]				1		0
Pre-Modification Outstanding Recorded Investment	[1],[2]				$ 709		$ 0
Post-Modification Outstanding Recorded Investment	[1],[2]				681		0
Total Difference in Recorded Investment	[2]				$ (28)		$ 0
Chapter 7 bankruptcy | Residential Mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | contract	[2]	1	0		4
Pre-Modification Outstanding Recorded Investment	[1],[2]	$ 65	$ 0		$ 285
Post-Modification Outstanding Recorded Investment	[1],[2]	64	0		280
Total Difference in Recorded Investment	[2]	$ (1)	$ 0		$ (5)
Chapter 7 bankruptcy | Home Equity
Financing Receivable, Modifications [Line Items]
Number of Loans | contract	[2]	4	4		9		12
Pre-Modification Outstanding Recorded Investment	[1],[2]	$ 73	$ 171		$ 318		$ 313
Post-Modification Outstanding Recorded Investment	[1],[2]	69	171		309		304
Total Difference in Recorded Investment	[2]	$ (4)	$ 0		$ (9)		$ (9)
Chapter 7 bankruptcy | Installment and Other Consumer
Financing Receivable, Modifications [Line Items]
Number of Loans | contract	[2]	2	0		2
Pre-Modification Outstanding Recorded Investment	[1],[2]	$ 16	$ 0		$ 16
Post-Modification Outstanding Recorded Investment	[1],[2]	13	0		13
Total Difference in Recorded Investment	[2]	$ (3)	$ 0		$ (3)
Interest rate reduction
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		0	0		0
Pre-Modification Outstanding Recorded Investment	[1]				$ 0
Post-Modification Outstanding Recorded Investment	[1]		$ 0		0
Total Difference in Recorded Investment			$ 0		$ 0
Maturity date extension and interest rate reduction
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		0	2		1		2
Pre-Modification Outstanding Recorded Investment	[1]	$ 0	$ 225		$ 130		$ 225
Post-Modification Outstanding Recorded Investment	[1]	0	225		128		$ 225
Total Difference in Recorded Investment		$ 0	$ 0		$ (2)
Maturity date extension and interest rate reduction | Residential Mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		0	2		0		2
Pre-Modification Outstanding Recorded Investment		$ 0	$ 225	[1]	$ 0	[1]	$ 225	[1]
Post-Modification Outstanding Recorded Investment		0	225	[1]	$ 0	[1]	$ 225	[1]
Total Difference in Recorded Investment		$ 0	$ 0
Maturity date extension and interest rate reduction | Home Equity
Financing Receivable, Modifications [Line Items]
Number of Loans | contract					1		0
Pre-Modification Outstanding Recorded Investment	[1]				$ 130		$ 0
Post-Modification Outstanding Recorded Investment	[1]				128		0
Total Difference in Recorded Investment					$ (2)		$ 0
Maturity date extension
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		8	0		13		2
Pre-Modification Outstanding Recorded Investment	[1]	$ 1,574	$ 0		$ 2,869		$ 851
Post-Modification Outstanding Recorded Investment	[1]	1,519	0		2,786		836
Total Difference in Recorded Investment		$ (55)	$ 0		$ (83)		$ (15)
Maturity date extension | Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		1	0		3		1
Pre-Modification Outstanding Recorded Investment	[1]	$ 130	$ 0		$ 755		$ 780
Post-Modification Outstanding Recorded Investment	[1]	130	0		728		765
Total Difference in Recorded Investment		$ 0	$ 0		$ (27)		$ (15)
Maturity date extension | Commercial Construction
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		4	0		5		0
Pre-Modification Outstanding Recorded Investment		$ 1,324	$ 0		$ 1,357	[1]
Post-Modification Outstanding Recorded Investment		1,269	0		1,303	[1]
Total Difference in Recorded Investment		$ (55)	$ 0		$ (54)
Maturity date extension | Residential Mortgage
Financing Receivable, Modifications [Line Items]
Number of Loans | contract					1
Pre-Modification Outstanding Recorded Investment	[1]				$ 483
Post-Modification Outstanding Recorded Investment	[1]				$ 483
Maturity date extension | Home Equity
Financing Receivable, Modifications [Line Items]
Number of Loans | contract		3	0		4		1
Pre-Modification Outstanding Recorded Investment		$ 120	$ 0		$ 274	[1]	$ 71	[1]
Post-Modification Outstanding Recorded Investment		120	0		272	[1]	$ 71	[1]
Total Difference in Recorded Investment		$ 0	$ 0		$ (2)
[1]	(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]	(2) Chapter 7 bankruptcy loans where the debt has been legally discharged through the bankruptcy court and not reaffirmed.

Loans and Loans Held for Sale51

Loans and Loans Held for Sale - Summary of Nonperforming Assets of Defaulted TDRs (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016USD ($)contract	Jun. 30, 2015USD ($)contract	Jun. 30, 2016USD ($)contract	Jun. 30, 2015USD ($)contract
Financing Receivable, Modifications [Line Items]
Number of Defaults | contract	0	2	1	4
Recorded Investment | $	$ 0	$ 119	$ 605	$ 307
Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Number of Defaults | contract	0	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of Defaults | contract	0	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Commercial Construction
Financing Receivable, Modifications [Line Items]
Number of Defaults | contract	0	0	1	0
Recorded Investment | $	$ 0	$ 0	$ 605	$ 0
Residential Real Estate
Financing Receivable, Modifications [Line Items]
Number of Defaults | contract	0	0	0	1
Recorded Investment | $	$ 0	$ 0	$ 0	$ 183
Home Equity
Financing Receivable, Modifications [Line Items]
Number of Defaults | contract	0	2	0	3
Recorded Investment | $	$ 0	$ 119	$ 0	$ 124
Installment and Other Consumer
Financing Receivable, Modifications [Line Items]
Number of Defaults | contract	0	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0
Consumer Construction
Financing Receivable, Modifications [Line Items]
Number of Defaults | contract	0	0	0	0
Recorded Investment | $	$ 0	$ 0	$ 0	$ 0

Loans and Loans Held for Sale52

Loans and Loans Held for Sale - Summary of Nonperforming Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Nonperforming Assets
Nonaccrual loans	$ 27,877	$ 27,723
Nonaccrual TDRs	15,028	7,659
Total nonaccrual loans	42,905	35,382
OREO	328	354
Total Nonperforming Assets	$ 43,233	$ 35,736

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, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	$ 5,322,516	$ 5,002,925
Total nonaccrual loans	42,905	35,382
Total past due	77,747	60,008
Total Loans	5,400,263	5,062,933
Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	1,366,728	1,244,802
Total nonaccrual loans	11,342	9,279
Total past due	19,018	12,028
Total Loans	1,385,746	1,256,830
Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	2,367,849	2,145,655
Total nonaccrual loans	10,887	8,719
Total past due	20,937	20,948
Total Loans	2,388,786	2,166,603
Commercial Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	382,985	401,084
Total nonaccrual loans	8,182	8,753
Total past due	15,137	12,360
Total Loans	398,122	413,444
Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	657,352	631,085
Total nonaccrual loans	9,283	5,629
Total past due	14,313	8,287
Total Loans	671,665	639,372
Home Equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	472,085	465,055
Total nonaccrual loans	3,168	2,902
Total past due	8,119	5,790
Total Loans	480,204	470,845
Installment and Other Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	57,916	73,486
Total nonaccrual loans	43	100
Total past due	223	453
Total Loans	58,139	73,939
Consumer Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	5,602	6,579
Total nonaccrual loans	0	0
Total past due	0	0
Total Loans	5,602	6,579
Loans Held for Sale
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans, Current	11,999	35,179
Total nonaccrual loans	0	0
Total past due	0	142
Total Loans	11,999	35,321
30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	25,871	22,001
30 to 59 Days Past Due | Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	7,276	2,453
30 to 59 Days Past Due | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	7,384	11,602
30 to 59 Days Past Due | Commercial Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	5,644	3,517
30 to 59 Days Past Due | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,191	1,728
30 to 59 Days Past Due | Home Equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	4,223	2,365
30 to 59 Days Past Due | Installment and Other Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	153	242
30 to 59 Days Past Due | Consumer Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
30 to 59 Days Past Due | Loans Held for Sale
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	94
60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	8,971	2,625
60 to 89 Days Past Due | Commercial and Industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	400	296
60 to 89 Days Past Due | Commercial Real Estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,666	627
60 to 89 Days Past Due | Commercial Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,311	90
60 to 89 Days Past Due | Residential Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	3,839	930
60 to 89 Days Past Due | Home Equity
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	728	523
60 to 89 Days Past Due | Installment and Other Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	27	111
60 to 89 Days Past Due | Consumer Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	0
60 to 89 Days Past Due | Loans Held for Sale
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 0	$ 48

Allowance for Loan Losses - Rec

Allowance for Loan Losses - Recorded Investment in Commercial Loan Classes by Internally Assigned Risk Ratings (Detail) - Commercial - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 4,172,654	$ 3,836,877
Total percentage of recorded investment in commercial loan	100.00%	100.00%
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 3,978,238	$ 3,653,344
Total percentage of recorded investment in commercial loan	95.30%	95.20%
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 74,370	$ 83,680
Total percentage of recorded investment in commercial loan	1.80%	2.20%
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 120,046	$ 99,853
Total percentage of recorded investment in commercial loan	2.90%	2.60%
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 1,385,746	$ 1,256,830
Total percentage of recorded investment in commercial loan	100.00%	100.00%
Commercial and Industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 1,302,427	$ 1,182,685
Total percentage of recorded investment in commercial loan	94.00%	94.10%
Commercial and Industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 31,865	$ 43,896
Total percentage of recorded investment in commercial loan	2.30%	3.50%
Commercial and Industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 51,454	$ 30,249
Total percentage of recorded investment in commercial loan	3.70%	2.40%
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 2,388,786	$ 2,166,603
Total percentage of recorded investment in commercial loan	100.00%	100.00%
Commercial Real Estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 2,314,317	$ 2,094,851
Total percentage of recorded investment in commercial loan	96.90%	96.70%
Commercial Real Estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 22,277	$ 19,938
Total percentage of recorded investment in commercial loan	0.90%	0.90%
Commercial Real Estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 52,192	$ 51,814
Total percentage of recorded investment in commercial loan	2.20%	2.40%
Commercial Construction
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 398,122	$ 413,444
Total percentage of recorded investment in commercial loan	100.00%	100.00%
Commercial Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 361,494	$ 375,808
Total percentage of recorded investment in commercial loan	90.80%	90.90%
Commercial Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 20,228	$ 19,846
Total percentage of recorded investment in commercial loan	5.10%	4.80%
Commercial Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 16,400	$ 17,790
Total percentage of recorded investment in commercial loan	4.10%	4.30%

Allowance for Loan Losses - Add

Allowance for Loan Losses - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Loans considered nonperforming (in days)	90 days
Evaluation for impairment of substandard and nonaccrual commercial loans	$ 500,000
Impaired fiinancing receivables	50,167,000	$ 45,650,000
Integrity Bancshares, Inc.
Financing Receivable, Impaired [Line Items]
Acquired loans that experienced credit deterioration since acquisition	$ 18,000,000

Allowance for Loan Losses - R56

Allowance for Loan Losses - Recorded Investment in Consumer Loan Classes by Performing and Nonperforming Status (Detail) - Consumer - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 1,215,610	$ 1,190,735
Percentage of Total	100.00%	100.00%
Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 1,203,116	$ 1,182,104
Percentage of Total	99.00%	99.30%
Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 12,494	$ 8,631
Percentage of Total	1.00%	0.70%
Residential Mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 671,665	$ 639,372
Percentage of Total	100.00%	100.00%
Residential Mortgage | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 662,382	$ 633,743
Percentage of Total	98.60%	99.10%
Residential Mortgage | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 9,283	$ 5,629
Percentage of Total	1.40%	0.90%
Home Equity
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 480,204	$ 470,845
Percentage of Total	100.00%	100.00%
Home Equity | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 477,036	$ 467,943
Percentage of Total	99.30%	99.40%
Home Equity | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 3,168	$ 2,902
Percentage of Total	0.70%	0.60%
Installment and Other Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 58,139	$ 73,939
Percentage of Total	100.00%	100.00%
Installment and Other Consumer | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 58,096	$ 73,839
Percentage of Total	99.90%	99.80%
Installment and Other Consumer | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 43	$ 100
Percentage of Total	0.10%	0.20%
Consumer Construction
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 5,602	$ 6,579
Percentage of Total	100.00%	100.00%
Consumer Construction | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 5,602	$ 6,579
Percentage of Total	100.00%	100.00%
Consumer Construction | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Loans and leases receivables, recorded investment	$ 0	$ 0
Percentage of Total	0.00%	0.00%

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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Financing Receivable, Impaired [Line Items]
Without a related allowance recorded, Recorded Investment	$ 44,574		$ 44,574		$ 45,032
Without a related allowance, Unpaid Principal Balance	60,120		60,120		50,286
Without a related allowance recorded, Related Allowance	0		0		0
With a related allowance recorded, Recorded Investment	5,593		5,593		618
With a related allowance recorded, Unpaid Principal Balance	6,649		6,649		1,468
Impaired Financing Receivable, Recorded Investment	50,167		50,167		45,650
Impaired Financing Receivable, Unpaid Principal Balance, Total	66,769		66,769		51,754
Impaired Financing Receivable, Related Allowance	2,162		2,162		37
Without a related allowance recorded, Average Recorded Investment	47,269	$ 45,651	47,849	$ 45,274
Without a related allowance recorded, Interest Income Recognized	317	418	673	792
With a related allowance recorded, Average Recorded Investment	5,879	545	6,275	337
With a related allowance recorded, Interest Income Recognized	38	2	76	3
Impaired Financing Receivable, Average Recorded Investment, Total	53,148	46,196	54,124	45,611
Impaired Financing Receivable, Interest Income Recognized, Total	355	420	749	795
Commercial and Industrial
Financing Receivable, Impaired [Line Items]
Without a related allowance recorded, Recorded Investment	11,313		11,313		14,417
Without a related allowance, Unpaid Principal Balance	12,174		12,174		15,220
Without a related allowance recorded, Related Allowance	0		0		0
With a related allowance recorded, Recorded Investment	4,499		4,499		0
With a related allowance recorded, Unpaid Principal Balance	4,984		4,984		0
Impaired Financing Receivable, Recorded Investment	15,812		15,812		14,417
Impaired Financing Receivable, Unpaid Principal Balance, Total	17,158		17,158		15,220
Impaired Financing Receivable, Related Allowance	1,991		1,991		0
Without a related allowance recorded, Average Recorded Investment	10,959	10,782	11,253	11,162
Without a related allowance recorded, Interest Income Recognized	98	84	189	146
With a related allowance recorded, Average Recorded Investment	4,617	0	4,999	0
With a related allowance recorded, Interest Income Recognized	31	0	63	0
Impaired Financing Receivable, Average Recorded Investment, Total	15,576	10,782	16,252	11,162
Impaired Financing Receivable, Interest Income Recognized, Total	129	84	252	146
Commercial Real Estate
Financing Receivable, Impaired [Line Items]
Without a related allowance recorded, Recorded Investment	12,326		12,326		12,661
Without a related allowance, Unpaid Principal Balance	22,765		22,765		13,157
Without a related allowance recorded, Related Allowance	0		0		0
With a related allowance recorded, Recorded Investment	0		0		0
With a related allowance recorded, Unpaid Principal Balance	0		0		0
Impaired Financing Receivable, Recorded Investment	12,326		12,326		12,661
Impaired Financing Receivable, Unpaid Principal Balance, Total	22,765		22,765		13,157
Impaired Financing Receivable, Related Allowance	0		0		0
Without a related allowance recorded, Average Recorded Investment	14,619	19,733	14,798	20,455
Without a related allowance recorded, Interest Income Recognized	64	158	132	322
With a related allowance recorded, Average Recorded Investment	0	420	0	211
With a related allowance recorded, Interest Income Recognized	0	0	0	0
Impaired Financing Receivable, Average Recorded Investment, Total	14,619	20,153	14,798	20,666
Impaired Financing Receivable, Interest Income Recognized, Total	64	158	132	322
Commercial Construction
Financing Receivable, Impaired [Line Items]
Without a related allowance recorded, Recorded Investment	9,918		9,918		10,998
Without a related allowance, Unpaid Principal Balance	13,494		13,494		14,200
Without a related allowance recorded, Related Allowance	0		0		0
With a related allowance recorded, Recorded Investment	1,064		1,064		500
With a related allowance recorded, Unpaid Principal Balance	1,635		1,635		1,350
Impaired Financing Receivable, Recorded Investment	10,982		10,982		11,498
Impaired Financing Receivable, Unpaid Principal Balance, Total	15,129		15,129		15,550
Impaired Financing Receivable, Related Allowance	141		141		3
Without a related allowance recorded, Average Recorded Investment	10,625	8,119	10,669	6,628
Without a related allowance recorded, Interest Income Recognized	48	81	108	134
With a related allowance recorded, Average Recorded Investment	1,232	0	1,244	0
With a related allowance recorded, Interest Income Recognized	6	0	12	0
Impaired Financing Receivable, Average Recorded Investment, Total	11,857	8,119	11,913	6,628
Impaired Financing Receivable, Interest Income Recognized, Total	54	81	120	134
Consumer Real Estate
Financing Receivable, Impaired [Line Items]
Without a related allowance recorded, Recorded Investment	10,983		10,983		6,845
Without a related allowance, Unpaid Principal Balance	11,646		11,646		7,521
Without a related allowance recorded, Related Allowance	0		0		0
With a related allowance recorded, Recorded Investment	29		29		116
With a related allowance recorded, Unpaid Principal Balance	29		29		116
Impaired Financing Receivable, Recorded Investment	11,012		11,012		6,961
Impaired Financing Receivable, Unpaid Principal Balance, Total	11,675		11,675		7,637
Impaired Financing Receivable, Related Allowance	29		29		32
Without a related allowance recorded, Average Recorded Investment	11,028	6,891	11,089	6,943
Without a related allowance recorded, Interest Income Recognized	107	91	243	186
With a related allowance recorded, Average Recorded Investment	29	121	30	122
With a related allowance recorded, Interest Income Recognized	1	2	1	3
Impaired Financing Receivable, Average Recorded Investment, Total	11,057	7,012	11,119	7,065
Impaired Financing Receivable, Interest Income Recognized, Total	108	93	244	189
Other Consumer
Financing Receivable, Impaired [Line Items]
Without a related allowance recorded, Recorded Investment	34		34		111
Without a related allowance, Unpaid Principal Balance	41		41		188
Without a related allowance recorded, Related Allowance	0		0		0
With a related allowance recorded, Recorded Investment	1		1		2
With a related allowance recorded, Unpaid Principal Balance	1		1		2
Impaired Financing Receivable, Recorded Investment	35		35		113
Impaired Financing Receivable, Unpaid Principal Balance, Total	42		42		190
Impaired Financing Receivable, Related Allowance	1		1		$ 2
Without a related allowance recorded, Average Recorded Investment	38	126	40	86
Without a related allowance recorded, Interest Income Recognized	0	4	1	4
With a related allowance recorded, Average Recorded Investment	1	4	2	4
With a related allowance recorded, Interest Income Recognized	0	0	0	0
Impaired Financing Receivable, Average Recorded Investment, Total	39	130	42	90
Impaired Financing Receivable, Interest Income Recognized, Total	$ 0	$ 4	$ 1	$ 4

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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 50,347	$ 48,106	$ 48,147	$ 47,911
Charge-offs	(3,496)	(1,755)	(7,123)	(3,205)
Recoveries	514	404	1,326	842
Net (Charge-offs)/ Recoveries	(2,982)	(1,351)	(5,797)	(2,363)
Provision for loan losses	4,848	2,059	9,863	3,266
Balance at End of Period	52,213	48,814	52,213	48,814
Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	14,740	13,711	10,853	13,668
Charge-offs	(136)	(992)	(2,830)	(1,698)
Recoveries	217	89	420	203
Net (Charge-offs)/ Recoveries	81	(903)	(2,410)	(1,495)
Provision for loan losses	(50)	500	6,328	1,135
Balance at End of Period	14,771	13,308	14,771	13,308
Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	15,266	19,071	15,043	20,164
Charge-offs	(1,662)	(310)	(1,715)	(376)
Recoveries	38	73	398	176
Net (Charge-offs)/ Recoveries	(1,624)	(237)	(1,317)	(200)
Provision for loan losses	2,336	184	2,252	(946)
Balance at End of Period	15,978	19,018	15,978	19,018
Commercial Construction
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	10,825	6,869	12,625	6,093
Charge-offs	(945)	0	(945)	0
Recoveries	2	1	3	2
Net (Charge-offs)/ Recoveries	(943)	1	(942)	2
Provision for loan losses	1,819	801	18	1,576
Balance at End of Period	11,701	7,671	11,701	7,671
Consumer Real Estate
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	8,261	6,723	8,400	6,333
Charge-offs	(290)	(177)	(522)	(552)
Recoveries	134	112	298	248
Net (Charge-offs)/ Recoveries	(156)	(65)	(224)	(304)
Provision for loan losses	313	369	242	998
Balance at End of Period	8,418	7,027	8,418	7,027
Other Consumer
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	1,255	1,732	1,226	1,653
Charge-offs	(463)	(276)	(1,111)	(579)
Recoveries	123	129	207	213
Net (Charge-offs)/ Recoveries	(340)	(147)	(904)	(366)
Provision for loan losses	430	205	1,023	503
Balance at End of Period	$ 1,345	$ 1,790	$ 1,345	$ 1,790

Allowance for Loan Losses - S59

Allowance for Loan Losses - Summary of Allowance for Loan Losses and Recorded Investments (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	$ 2,162		$ 37
Allowance for Loan Losses, Collectively Evaluated for Impairment	50,051		48,110
Total Allowance for Loan Losses	52,213	$ 50,347	48,147	$ 48,814	$ 48,106	$ 47,911
Portfolio Loans, Individually Evaluated for Impairment	50,167		45,650
Portfolio Loans, Collectively Evaluated for Impairment	5,338,097		4,981,962
Total Portfolio Loans	5,388,264		5,027,612
Commercial and Industrial
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	1,991		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	12,780		10,853
Total Allowance for Loan Losses	14,771	14,740	10,853	13,308	13,711	13,668
Portfolio Loans, Individually Evaluated for Impairment	15,812		14,417
Portfolio Loans, Collectively Evaluated for Impairment	1,369,934		1,242,413
Total Portfolio Loans	1,385,746		1,256,830
Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	0		0
Allowance for Loan Losses, Collectively Evaluated for Impairment	15,978		15,043
Total Allowance for Loan Losses	15,978	15,266	15,043	19,018	19,071	20,164
Portfolio Loans, Individually Evaluated for Impairment	12,326		12,661
Portfolio Loans, Collectively Evaluated for Impairment	2,376,460		2,153,942
Total Portfolio Loans	2,388,786		2,166,603
Commercial Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	141		3
Allowance for Loan Losses, Collectively Evaluated for Impairment	11,560		12,622
Total Allowance for Loan Losses	11,701	10,825	12,625	7,671	6,869	6,093
Portfolio Loans, Individually Evaluated for Impairment	10,982		11,498
Portfolio Loans, Collectively Evaluated for Impairment	387,140		401,946
Total Portfolio Loans	398,122		413,444
Consumer Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	29		32
Allowance for Loan Losses, Collectively Evaluated for Impairment	8,389		8,368
Total Allowance for Loan Losses	8,418	8,261	8,400	7,027	6,723	6,333
Portfolio Loans, Individually Evaluated for Impairment	11,012		6,961
Portfolio Loans, Collectively Evaluated for Impairment	1,146,459		1,109,835
Total Portfolio Loans	1,157,471		1,116,796
Other Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan Losses, Individually Evaluated for Impairment	1		2
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,344		1,224
Total Allowance for Loan Losses	1,345	$ 1,255	1,226	$ 1,790	$ 1,732	$ 1,653
Portfolio Loans, Individually Evaluated for Impairment	35		113
Portfolio Loans, Collectively Evaluated for Impairment	58,104		73,826
Total Portfolio Loans	$ 58,139		$ 73,939

Derivative Instruments and He60

Derivative Instruments and Hedging Activities - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Period for commitments	60 days

Derivative Instruments and He61

Derivative Instruments and Hedging Activities - Value of Derivative Assets and Derivative Liabilities (Detail) - Not Designated as Hedging Instruments - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015
Other Assets
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Assets)		$ 16,926	$ 11,295
Collateral posted, Derivatives	[1]	0	0
Other Assets | Interest Rate Swaps
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Assets)		16,926	11,295
Notional amount, Derivatives (included in Other Assets)		249,799	245,595
Collateral posted, Derivatives		0	0
Other Assets | Interest Rate Lock Commitments
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Assets)		643	261
Notional amount, Derivatives (included in Other Assets)		17,959	9,894
Other Assets | Forward Sale Contracts
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Assets)		0	0
Notional amount, Derivatives (included in Other Assets)		0	0
Other Liabilities
Derivatives not Designated as Hedging Instruments
Collateral posted, Derivatives	[1]	13,764	12,573
Fair value, Derivatives (included in Other Liabilities)		16,786	11,276
Other Liabilities | Interest Rate Swaps
Derivatives not Designated as Hedging Instruments
Collateral posted, Derivatives		13,764	12,753
Fair value, Derivatives (included in Other Liabilities)		16,786	11,276
Notional amount, Derivatives (included in Other Liabilities)		249,799	245,595
Other Liabilities | Interest Rate Lock Commitments
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Liabilities)		0	0
Notional amount, Derivatives (included in Other Liabilities)		0	0
Other Liabilities | Forward Sale Contracts
Derivatives not Designated as Hedging Instruments
Fair value, Derivatives (included in Other Liabilities)		204	5
Notional amount, Derivatives (included in Other Liabilities)		$ 17,073	$ 9,800
[1]	Amounts represent posted collateral.

Derivative Instruments and He62

Derivative Instruments and Hedging Activities - Schedule of Gross Amounts of Derivative Assets and Derivative Liabilities (Detail) - Not Designated as Hedging Instruments - USD ($) $ in Thousands		Jun. 30, 2016	Dec. 31, 2015
Other Assets
Derivative Asset [Abstract]
Gross amounts recognized		$ 16,926	$ 11,295
Gross amounts offset		0	0
Net amounts presented in the Consolidated Balance Sheets		16,926	11,295
Net Amount		16,926	11,295
Derivative Liability [Abstract]
Gross amounts not offset	[1]	0	0
Other Liabilities
Derivative Liability [Abstract]
Gross amounts recognized		16,786	11,276
Gross amounts offset		0	0
Net amounts presented in the Consolidated Balance Sheets		16,786	11,276
Gross amounts not offset	[1]	(13,764)	(12,573)
Net Amount		$ 3,022	$ (1,297)
[1]	Amounts represent posted collateral.

Derivative Instruments and He63

Derivative Instruments and Hedging Activities - Amount of Gain or Loss Recognized in Income on Derivatives (Detail) - Not Designated as Hedging Instruments - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives Gain	$ 8	$ 63	$ 303	$ 194
Interest Rate Swap Contracts - Commercial Loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives Gain	23	(21)	120	(8)
Interest Rate Lock Commitments - Mortgage Loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives Gain	117	(8)	382	128
Forward Sale Contracts - Mortgage Loans
Derivative Instruments, Gain (Loss) [Line Items]
Total Derivatives Gain	$ (132)	$ 92	$ (199)	$ 74

Borrowings Borrowings - Additio

Borrowings Borrowings - Additional Information (Detail) - USD ($)	Jun. 18, 2015	Mar. 05, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Mar. 04, 2015
Long Term And Short Term Debt [Line Items]
Total long-term debt outstanding at a fixed rate			$ 12,700,000
Total long-term debt outstanding at a variable rate			3,100,000
Capital lease			100,000
Repayment of junior subordinated debt			0	$ 13,500,000
Federal Home Loan Bank Advance
Long Term And Short Term Debt [Line Items]
Total borrowings			565,800,000		$ 472,900,000
Short-term borrowings			550,000,000
Long-term borrowings			15,800,000
Maximum borrowing capacity			2,100,000,000
Remaining borrowing capacity			1,300,000,000
Borrowing capacity utilized			787,900,000
Letter of credit to collateralize public funds			222,100,000
Junior Subordinated Debt
Long Term And Short Term Debt [Line Items]
Repayment of junior subordinated debt	$ 5,000,000	$ 8,500,000
Integrity Bancshares, Inc. | Junior Subordinated Debt
Long Term And Short Term Debt [Line Items]
Debt assumed in acquisition						$ 13,500,000
Mortgage Backed Securities
Long Term And Short Term Debt [Line Items]
Mortgage backed securities pledged as collateral			$ 52,300,000		$ 67,000,000

Borrowings Borrowings - Summary

Borrowings Borrowings - Summary of Information Pertaining to Borrowings (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Long Term And Short Term Debt [Line Items]
Short-term borrowings	$ 598,479	$ 418,086
Long-term borrowings	61,507	162,662
Total Borrowings	$ 659,986	$ 580,748
Short-term borrowings, Weighted Average Rate	0.55%	0.44%
Long-term borrowings, Weighted Average Rate	3.09%	1.39%
Total Borrowings, Weighted Average Rate	0.79%	0.71%
Securities Sold under Repurchase Agreements
Long Term And Short Term Debt [Line Items]
Short-term borrowings	$ 48,479	$ 62,086
Short-term borrowings, Weighted Average Rate	0.01%	0.01%
Short-Term Borrowings
Long Term And Short Term Debt [Line Items]
Short-term borrowings	$ 550,000	$ 356,000
Short-term borrowings, Weighted Average Rate	0.60%	0.52%
Other Long-Term Borrowings
Long Term And Short Term Debt [Line Items]
Long-term borrowings	$ 15,888	$ 117,043
Long-term borrowings, Weighted Average Rate	2.92%	0.81%
Junior Subordinated Debt Securities
Long Term And Short Term Debt [Line Items]
Long-term borrowings	$ 45,619	$ 45,619
Long-term borrowings, Weighted Average Rate	3.15%	2.89%

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Allowance for unfunded commitments	$ 2.7	$ 2.5

Commitments and Contingencies67

Commitments and Contingencies - Commitments and Letters of Credit (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Other Commitments [Line Items]
Commitments and letters of credit	$ 1,682,459	$ 1,717,530
Commitments to Extend Credit
Other Commitments [Line Items]
Commitments and letters of credit	1,601,779	1,619,854
Standby Letters of Credit
Other Commitments [Line Items]
Commitments and letters of credit	$ 80,680	$ 97,676

Other Comprehensive Income Oth

Other Comprehensive Income Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Pre-Tax Amount
Change in net unrealized gains/(losses) on securities available-for-sale		$ 4,636	$ (5,872)	$ 13,669	$ (889)
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income	[1]	0	34	0	34
Adjustment to funded status of employee benefit plans		545	463	4,345	1,192
Other Comprehensive Income/(Loss)		5,181	(5,375)	18,014	337
Tax (Expense) Benefit
Change in net unrealized gains/(losses) on securities available-for-sale		(1,622)	2,056	(4,784)	311
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income	[1]	0	(12)	0	(12)
Adjustment to funded status of employee benefit plans		(191)	(162)	(1,521)	(324)
Other Comprehensive (Loss)/Income		(1,813)	1,882	(6,305)	(25)
Net of Tax Amount
Change in net unrealized gains/(losses) on securities available-for-sale		3,014	(3,816)	8,885	(578)
Reclassification adjustment for net (gains)/losses on securities available-for-sale included in net income	[1]	0	22	0	22
Adjustment to funded status of employee benefit plans		354	301	2,824	868
Other Comprehensive Income/(Loss)		$ 3,368	$ (3,493)	$ 11,709	$ 312
[1]	(1) Reclassification adjustments are comprised of realized security gains or losses. The realized gains or losses 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 Be69

Employee Benefits Employee Benefits - Additional Information (Detail) - USD ($) $ in Millions	Jan. 01, 2015	Mar. 31, 2016	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Pension plan curtailment gain		$ 1
Period of unrecognized benefits associated with prior year plan amendments that would have been amortized into income		7 years
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			7.50%
Lump sum death benefit to unmarried beneficiary as percent of accrued benefit payable (percent)	80.00%

Employee Benefits Employee Be70

Employee Benefits 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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Components of Net Periodic Pension Cost
Service cost—benefits earned during the period	$ 0	$ 672	$ 474	$ 1,344
Interest cost on projected benefit obligation	1,036	1,100	2,101	2,200
Expected return on plan assets	(1,434)	(1,807)	(2,893)	(3,614)
Amortization of prior service credit	(35)	(35)	(70)	(70)
Recognized net actuarial loss	526	468	1,070	936
Net Periodic Pension Expense	$ 93	$ 398	$ 682	$ 796

Segments - Additional Informati

Segments - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2016segment
Segment Reporting [Abstract]
Number of reportable segments	3
Number of operating segments	3

Segments - Total Assets by Repo

Segments - Total Assets by Reportable Operating Segment (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	$ 6,674,205	$ 6,318,354
Operating Segments | Community Banking
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	6,661,869	6,305,046
Operating Segments | Insurance
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	8,336	9,619
Operating Segments | Wealth Management
Segment Reporting, Asset Reconciling Item [Line Items]
Total Assets	$ 4,000	$ 3,689

Segments - Financial Informatio

Segments - Financial Information of Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Interest income	$ 55,850	$ 52,611	$ 110,870	$ 96,526
Interest expense	6,142	3,800	11,524	7,456
NET INTEREST INCOME	49,708	48,811	99,346	89,070
Provision for loan losses	4,848	2,059	9,863	3,266
Noninterest income	12,448	13,383	28,265	25,467
Noninterest expense	33,105	33,634	69,861	65,877
Depreciation expense	1,239	1,299	2,439	2,329
Amortization of intangible assets	409	516	869	864
Provision for income taxes	5,496	6,498	11,427	11,178
Net Income	17,059	18,188	33,152	31,023
Operating Segments | Community Banking
Segment Reporting, Asset Reconciling Item [Line Items]
Interest income	55,839	52,598	110,857	96,483
Interest expense	6,213	4,056	11,651	7,944
NET INTEREST INCOME	49,626	48,542	99,206	88,539
Provision for loan losses	4,848	2,059	9,863	3,266
Noninterest income	8,589	8,869	18,919	16,406
Noninterest expense	29,462	29,916	61,610	58,603
Depreciation expense	1,224	1,279	2,410	2,290
Amortization of intangible assets	391	495	831	822
Provision for income taxes	5,404	6,139	11,018	10,396
Net Income	16,886	17,523	32,393	29,568
Operating Segments | Insurance
Segment Reporting, Asset Reconciling Item [Line Items]
Interest income	1	1	1	1
NET INTEREST INCOME	1	1	1	1
Noninterest income	1,093	1,328	2,717	2,881
Noninterest expense	1,103	1,053	2,358	2,190
Depreciation expense	11	14	21	26
Amortization of intangible assets	12	13	25	25
Provision for income taxes	(12)	88	110	224
Net Income	(20)	161	204	417
Operating Segments | Wealth Management
Segment Reporting, Asset Reconciling Item [Line Items]
Interest income	117	157	245	298
NET INTEREST INCOME	117	157	245	298
Noninterest income	2,627	2,917	5,373	5,833
Noninterest expense	2,437	2,285	4,743	4,505
Depreciation expense	4	6	8	13
Amortization of intangible assets	6	8	13	17
Provision for income taxes	104	271	299	558
Net Income	193	504	555	1,038
Eliminations
Segment Reporting, Asset Reconciling Item [Line Items]
Interest income	(107)	(145)	(233)	(256)
Interest expense	(71)	(256)	(127)	(488)
NET INTEREST INCOME	(36)	111	(106)	232
Noninterest income	139	269	1,256	347
Noninterest expense	$ 103	$ 380	$ 1,150	$ 579

Qualified Affordable Housing 74

Qualified Affordable Housing Projects (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Investments in Affordable Housing Projects [Abstract]
Investment in qualified affordable housing projects	$ 13,400,000		$ 13,400,000		$ 15,000,000
Open commitments	0		0		$ 0
Amortization expense included in noninterest expense	800,000	$ 900,000	1,600,000	$ 1,900,000
Tax credits	$ 900,000	$ 1,000,000	$ 1,800,000	$ 2,000,000