Park National (PRK) 10-K 18 Feb 16 2015 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2015	Feb. 17, 2016	Jun. 30, 2015
Entity Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Entity Registrant Name	PARK NATIONAL CORP /OH/
Entity Central Index Key	805,676
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Common Stock, Shares Outstanding		15,330,812
Entity Public Float			$ 1,316,169,477

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets:
Cash and due from banks	$ 119,412	$ 133,511
Money market instruments	30,047	104,188
Cash and cash equivalents	149,459	237,699
Investment securities:
Securities available-for-sale, at fair value (amortized cost of $1,436,714 and $1,299,980 at December 31, 2015 and 2014, respectively)	1,436,266	1,301,915
Securities held-to-maturity, at amortized cost (fair value of $151,428 and $143,490 at December 31, 2015 and 2014, respectively)	149,302	140,562
Other investment securities	58,311	58,311
Total investment securities	1,643,879	1,500,788
Total loans	5,068,085	4,829,682
Allowance for loan losses	(56,494)	(54,352)
Net loans	5,011,591	4,775,330
Other assets:
Bank owned life insurance	181,684	171,928
Prepaid Expense, Current	80,635	75,190
Goodwill	72,334	72,334
Premises and equipment, net	59,493	55,479
Amortization Method Qualified Affordable Housing Project Investments	51,247	48,911
Accrued interest receivable	18,675	17,677
Other Real Estate, Foreclosed Assets, and Repossessed Assets	18,651	22,605
Mortgage loan servicing rights	9,008	8,613
Other	14,698	14,645
Total other assets	506,425	487,382
Total assets	7,311,354	7,001,199
Deposits:
Non-interest bearing	1,404,032	1,269,296
Interest bearing	3,943,610	3,858,704
Total deposits	5,347,642	5,128,000
Short-term borrowings	394,242	276,980
Long-term debt	738,105	786,602
Subordinated notes	45,000	45,000
Total borrowings	1,177,347	1,108,582
Other liabilities:
Accrued interest payable	2,338	2,551
Qualified Affordable Housing Project Investments, Commitment	20,311	16,629
Other	50,361	48,896
Total other liabilities	73,010	68,076
Total liabilities	$ 6,597,999	$ 6,304,658
Commitments and Contingencies
Shareholders’ equity:
Preferred Stock, Value, Issued	$ 0	$ 0
Common shares, no par value (20,000,000 shares authorized; 16,150,854 and 16,150,888 shares issued at December 31, 2015 and 2014, respectively)	303,966	303,104
Accumulated other comprehensive loss, net	(15,643)	(13,608)
Retained earnings	507,505	484,484
Less: Treasury shares (820,039 and 758,489 shares at December 31, 2015 and 2014, respectively)	(82,473)	(77,439)
Total shareholders’ equity	713,355	696,541
Total liabilities and shareholders’ equity	$ 7,311,354	$ 7,001,199

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Amortized cost of securities available-for-sale	$ 1,436,714	$ 1,299,980
Fair value of securities held-to-maturity	$ 151,428	$ 143,490
Preferred stock, shares authorized	200,000	200,000
Preferred stock, shares issued	0	0
Preferred stock per share liquidation preference	$ 0	$ 0
Common stock, no par value	$ 0	$ 0
Common stock, shares authorized	20,000,000	20,000,000
Common stock stock, shares issued	16,150,854	16,150,888
Treasury stock, shares	820,039	758,489

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest and dividend income:
Interest and fees on loans	$ 227,979	$ 227,644	$ 225,538
Interest and dividends on:
Obligations of U.S. Government, its agencies and other securities	36,025	36,981	36,686
Obligations of states and political subdivisions	182	3	45
Other interest income	888	515	678
Total interest and dividend income	265,074	265,143	262,947
Interest on deposits:
Demand and savings deposits	2,229	1,677	1,773
Time deposits	10,125	9,323	11,235
Interest on short-term borrowings	469	517	544
Interest on long-term debt	24,619	28,582	28,370
Total interest expense	37,442	40,099	41,922
Net interest income	227,632	225,044	221,025
Provision for (recovery of) loan losses	4,990	(7,333)	3,415
Net interest income after provision for (recovery of) loan losses	222,642	232,377	217,610
Other income:
Income from fiduciary activities	20,195	19,150	17,133
Service charges on deposit accounts	14,751	15,423	16,316
Net gain on sales of securities	88	(1,158)	0
Other service income	11,438	10,459	12,913
Checkcard fee income	14,561	13,570	12,955
Bank owned life insurance income	5,783	4,861	5,041
ATM fees	2,428	2,467	2,632
Gain on sale of OREO, net	1,604	5,503	3,110
OREO valuation adjustments	(1,592)	(2,406)	(3,180)
Gain (Loss) on Sales of Loans, Net	756	1,867	0
Miscellaneous	7,539	5,813	6,357
Total other income	77,551	75,549	73,277
Other expense:
Salaries	86,189	81,977	80,985
Employee Benefit Expense	21,296	19,991	19,313
Data processing fees	5,037	4,712	4,174
Professional fees and services	23,452	29,580	27,865
Occupancy expense	9,686	10,006	9,804
Furniture and equipment expense	11,806	11,571	11,249
Insurance	5,629	5,723	5,205
Marketing	3,983	4,371	3,790
Communication	5,130	5,268	5,790
State tax expense	3,566	2,290	3,702
OREO expense	1,446	2,063	2,731
Miscellaneous	9,394	9,958	6,907
Total other expense	186,614	187,510	181,515
Income (loss) before taxes	113,579	120,416	109,372
Federal income taxes	32,567	36,459	32,503
Net income	$ 81,012	$ 83,957	$ 76,869
Earnings per common share:
Basic (in dollars per share)	$ 5.27	$ 5.45	$ 4.99
Diluted (in dollars per share)	$ 5.26	$ 5.45	$ 4.99

Statements of Comprehensive Inc

Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net income	$ 81,012	$ 83,957	$ 76,869
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax	424	12	1,770
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	(910)	(9,279)	19,766
Other comprehensive income (loss), net of tax:
Changes in pension plan assets and benefit obligations recognized in other comprehensive income	(486)	(9,267)	21,536
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	0	753	0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax	0	0	11
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax	(1,549)	30,325	(39,448)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(1,549)	31,078	(39,437)
Other Comprehensive Income (Loss), Net of Tax	(2,035)	21,811	(17,901)
Comprehensive income	$ 78,977	$ 105,768	$ 58,968

Statements of Comprehensive In6

Statements of Comprehensive Income (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax	$ 424,000	$ 12,000	$ 1,770,000
Tax Effect
Amortization of net loss and prior service costs, tax expense	228	7	953
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	(490)	(4,997)	10,643
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	0	405	0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Tax	0	0	6
Unrealized net holding gain (loss) on securities available-for-sale, tax expense	(834)	16,329	(21,242)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	$ (910,000)	$ (9,279,000)	$ 19,766,000

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Shares	Common Shares	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive (Loss) Income
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	$ 648,800			$ 440,039
Cumulative Effect of New Accounting Principle in Period of Adoption	(1,566)			(1,566)
Beginning balance at Dec. 31, 2012	650,366	$ 0	$ 302,654	441,605	$ (76,375)	$ (17,518)
Beginning balance, shares at Dec. 31, 2012		0	15,411,998
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	76,869			76,869
Other comprehensive income (loss), net of tax:
Other Comprehensive Income (Loss), Net of Tax	(17,901)					(17,901)
Cash dividends	(57,949)			(57,949)
Fractional shares issued in dividend reinvestment plan, shares			(46)
Cash payment for fractional shares in dividend reinvestment plan	(3)		$ (3)
Treasury Stock, Shares, Acquired			(10,550)
Treasury Stock, Value, Acquired, Cost Method	$ 843				843
Treasury Stock Reissued Shares For Director Grants	10,550		10,550
Treasury shares reissued for director grants	$ 850			(240)	1,090
Ending balance at Dec. 31, 2013	649,823	$ 0	$ 302,651	458,719	(76,128)	(35,419)
Ending balance, shares at Dec. 31, 2013		0	15,411,952
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	83,957			83,957
Other comprehensive income (loss), net of tax:
Other Comprehensive Income (Loss), Net of Tax	21,811					21,811
Cash dividends	(57,949)			(57,949)
Fractional shares issued in dividend reinvestment plan, shares			(53)
Cash payment for fractional shares in dividend reinvestment plan	(5)		$ (5)
Allocated Share-based Compensation Expense	458		$ 458
Treasury Stock, Shares, Acquired			(29,700)
Treasury Stock, Value, Acquired, Cost Method	$ 2,355				(2,355)
Treasury Stock Reissued Shares For Director Grants	10,200		10,200
Treasury shares reissued for director grants	$ 801			(243)	1,044
Ending balance at Dec. 31, 2014	696,541	$ 0	$ 303,104	484,484	(77,439)	(13,608)
Ending balance, shares at Dec. 31, 2014		0	15,392,399
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	81,012			81,012
Other comprehensive income (loss), net of tax:
Other Comprehensive Income (Loss), Net of Tax	(2,035)					(2,035)
Cash dividends	(57,930)			(57,930)
Fractional shares issued in dividend reinvestment plan, shares			(34)
Cash payment for fractional shares in dividend reinvestment plan	(3)		$ (3)
Allocated Share-based Compensation Expense	865		$ 865
Treasury Stock, Shares, Acquired			(71,700)
Treasury Stock, Value, Acquired, Cost Method	$ 6,058				6,058
Treasury Stock Reissued Shares For Director Grants	10,150		10,150
Treasury shares reissued for director grants	$ 963			(61)	1,024
Ending balance at Dec. 31, 2015	$ 713,355	$ 0	$ 303,966	$ 507,505	$ (82,473)	$ (15,643)
Ending balance, shares at Dec. 31, 2015		0	15,330,815

Consolidated Statements of Cha8

Consolidated Statements of Changes In Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash dividends on common stock per share	$ 3.76	$ 3.76	$ 3.76

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest Paid	$ 37,655	$ 40,449	$ 42,481
Operating activities:
Net income	81,012	83,957	76,869
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for (recovery of) loan losses	4,990	(7,333)	3,415
Amortization of loan fees and costs, net	6,440	4,160	3,611
Depreciation	7,347	7,243	7,315
Other than temporary impairment on investment securities	0	0	17
Amortization of intangible assets	0	0	337
Accretion of investment securities, net	(226)	(213)	(33)
Amortization of prepayment penalty on long term debt	6,047	5,031	4,835
Deferred income tax	(250)	2,528	(1,932)
Realized net investment security (gains) losses	0	1,158	0
Loan originations to be sold in secondary market	(220,800)	(136,125)	(317,534)
Proceeds from sale of loans in secondary market	222,785	135,209	345,704
Gain on sale of loans in secondary market	(756)	(1,867)	0
Proceeds from Sale of Other Loans Held-for-sale	900	20,966	0
Share-based Compensation	1,828	1,259	850
OREO valuation adjustments	1,592	2,406	3,180
Gains (Losses) on Sales of Other Real Estate	(1,604)	(5,503)	(3,110)
Proceeds from Sale of Other Real Estate	17,058	27,798	23,043
Bank owned life insurance income	(5,783)	(4,861)	(5,041)
Changes in assets and liabilities:
(Increase) Decrease in other assets	(10,978)	(18,313)	12,222
Decrease (Increase) in other liabilities	1,173	5,689	(5,324)
Net cash provided by operating activities	88,702	71,743	121,288
Proceeds from Life Insurance Policies	6,340	2,221	1,430
Investing activities:
Proceeds from Sale of Federal Home Loan Bank Stock	0	8,946	0
Proceeds from sales of securities	3,144	173,123	75,000
Proceeds from calls and maturities of securities:
Held-to-maturity	36,393	41,436	219,329
Available-for-sale	321,146	99,092	385,259
Purchase of securities:
Held-to-maturity	(48,226)	0	0
Available-for-sale	(457,617)	(350,934)	(582,728)
Net increase in other investments	0	(1,350)	0
Net loan originations, portfolio loans	247,882	234,017	212,311
Payments for Affordable Housing Programs	(5,318)	(9,417)	(8,222)
Payments to Acquire Life Insurance Policies	10,045	0	4,600
Purchases of premises and equipment, net	(11,361)	(7,444)	(8,842)
Net cash used in investing activities	(395,468)	(229,580)	(112,642)
Financing activities
Net increase in deposits	219,642	338,006	73,962
Net increase (decrease) in short-term borrowings	117,262	34,951	(102,139)
Proceeds from issuance of long-term debt	25,000	125,000	75,000
Repayment of subordinated notes	0	(35,250)	0
Repayment of long-term debt	(79,544)	(153,970)	(50,952)
Treasury Stock, Value, Acquired, Cost Method	(6,058)	(2,355)	(843)
Cash dividends paid	(57,776)	(57,876)	(57,949)
Net cash provided by (used in) financing activities	218,526	248,506	(62,921)
(Decrease) increase in cash and cash equivalents	(88,240)	90,669	(54,275)
Cash and cash equivalents at beginning of year	237,699	147,030	201,305
Cash and cash equivalents at end of year	149,459	237,699	147,030
Income Taxes Paid	26,140	27,810	20,000
Non cash activities [Abstract]
Real Estate Owned, Transfer to Real Estate Owned	13,447	12,780	22,144
Transfer of Portfolio Loans and Leases to Held-for-sale	144	21,985	0
Affordable Housing Program Obligation, Period Increase (Decrease)	9,000	8,000	7,000
Mortgage Loans on Real Estate [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Gain (Loss) on Sale of Loans and Leases	4,027	$ 2,682	$ 4,093
Held-to-maturity Securities [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Realized net investment security (gains) losses	$ (88)

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies The following is a summary of significant accounting policies followed in the preparation of the consolidated financial statements: Principles of Consolidation The consolidated financial statements include the accounts of Park National Corporation and its subsidiaries (“Park”, the “Company” or the “Corporation”). Material intercompany accounts and transactions have been eliminated. Use of Estimates The preparation of financial statements in conformity with U.S. generally accepted accounting principles ("GAAP") requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. Management has identified the allowance for loan losses, accounting for Other Real Estate Owned (“OREO”), fair value accounting, accounting for goodwill and accounting for pension plan and other post-retirement benefits as significant estimates. Reclassifications Certain prior year amounts have been reclassified to conform with the current year presentation. Additionally, prior period financial statements reflect the retrospective application of Accounting Standards Update ("ASU") 2014-01, Investments-Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects. Restrictions on Cash and Due from Banks The Corporation’s national bank subsidiary is required to maintain average reserve balances with the Federal Reserve Bank. The average required reserve balance was approximately $44.2 million at December 31, 2015 and $40.3 million at December 31, 2014 . No other compensating balance arrangements were in existence at December 31, 2015 . Investment Securities Investment securities are classified upon acquisition into one of three categories: held-to-maturity ("HTM"), available-for-sale ("AFS"), or trading (see Note 5 - Investment Securities). HTM securities are those securities that the Corporation has the positive intent and ability to hold to maturity and are recorded at amortized cost. AFS securities are those securities that would be available to be sold in the future in response to the Corporation’s liquidity needs, changes in market interest rates, and asset-liability management strategies, among other reasons. AFS securities are reported at fair value, with unrealized holding gains and losses excluded from earnings but included in other comprehensive income (loss), net of applicable taxes. The Corporation did not hold any trading securities during any period presented. AFS and HTM securities are evaluated quarterly for potential other-than-temporary impairment. Management considers the facts related to each security including the nature of the security, the amount and duration of the loss, the credit quality of the issuer, the expectations for that security’s performance and whether Park intends to sell, or it is more likely than not that Park will be required to sell, a security in an unrealized loss position before recovery of its amortized cost basis. Declines in the value of equity securities that are considered to be other-than-temporary are recorded as a charge to earnings in the Consolidated Statements of Income. Declines in the value of debt securities that are considered to be other-than-temporary are separated into (1) the amount of the total impairment related to credit loss and (2) the amount of the total impairment related to all other factors. The amount of the total other-than-temporary impairment related to the credit loss is recognized in earnings. The amount of the total other-than-temporary impairment related to all other factors is recognized in other comprehensive income (loss), net of tax. Interest income from investment securities includes amortization of purchase premium or discount. Premiums and discounts on securities are amortized on the level-yield method without anticipating prepayments, except for mortgage-backed securities where prepayments are anticipated. Gains and losses realized on the sale of investment securities are recorded on the trade date and determined using the specific identification basis. Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) Stock Park’s national bank subsidiary, The Park National Bank ("PNB") is a member of the FHLB. Additionally, PNB is a member of the FRB. Members are required to own a certain amount of stock based on their level of borrowings and other factors and may invest in additional amounts. FHLB stock and FRB stock are classified as restricted securities and are carried at their redemption value within other investment securities on the Consolidated Balance Sheets. Impairment is evaluated based on the ultimate recovery of par value. Both cash and stock dividends are reported as income. Bank Owned Life Insurance Park has purchased insurance policies on the lives of directors and certain key officers. Bank owned life insurance is recorded at its cash surrender value (or the amount that can be realized). Loans Held for Sale Generally, loans held for sale are carried at the lower of cost or fair value. Park has elected the fair value option for mortgage loans held for sale, which are carried at their fair value. Mortgage Banking Derivatives Commitments to fund mortgage loans (interest rate locks) to be sold into the secondary market and forward commitments for the future delivery of these mortgage loans are accounted for as free standing derivatives. The fair values of these mortgage derivatives are estimated based on changes in mortgage interest rates from the date the interest rate on the loan is locked. The Company enters into forward commitments for the future delivery of mortgage loans when interest rate locks are entered into, in order to hedge the change in interest rates resulting from its commitments to fund the loans. Changes in the fair values of these derivatives are included in net gains on sale of loans. Loans Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff, are reported at their outstanding principal balances adjusted for any charge-offs, any deferred fees or costs on originated loans, and any unamortized premiums or discounts on purchased loans. Interest income is reported on the interest method and includes amortization of net deferred loan origination fees and costs over the loan term. Commercial loans include: (1) commercial, financial and agricultural loans; (2) commercial real estate loans; (3) those commercial loans in the real estate construction loan segment; and (4) those commercial loans in the residential real estate loan segment. Consumer loans include: (1) mortgage and installment loans included in the real estate construction segment; (2) mortgage, home equity lines of credit (HELOC), and installment loans included in the residential real estate segment; and (3) all loans included in the consumer segment. Generally, commercial loans are placed on nonaccrual status at 90 days past due and consumer and residential mortgage loans are placed on nonaccrual status at 120 days past due. Commercial loans placed on nonaccrual status are considered impaired (see Note 6 - Loans). For loans which are on nonaccrual status, it is Park’s policy to reverse interest previously accrued on the loans against interest income. Interest on such loans may be recorded on a cash basis and be included in earnings only when cash is actually received. Park’s charge-off policy for commercial loans requires management to establish a specific reserve or record a charge-off as soon as it is apparent that the borrower is troubled and there is, or likely will be, a collateral shortfall related to the estimated value of the collateral securing the loan. The Company’s charge-off policy for consumer loans is dependent on the class of the loan. Residential mortgage loans, HELOCs, and consumer loans secured by residential real estate are typically charged down to the value of the collateral, less estimated selling costs, at 180 days past due. The charge-off policy for other consumer loans, primarily installment loans, requires a monthly review of delinquent loans and a complete charge-off for any account that reaches 120 days past due. The delinquency status of a loan is based on contractual terms and not on how recently payments have been received. Loans may be removed from nonaccrual status when loan payments have been received to cure the delinquency status, the borrower has demonstrated the ability to maintain current payment status in accordance with the loan agreement and the loan is deemed to be well-secured by management. A description of each segment of the loan portfolio, along with the risk characteristics of each segment, is included below: Commercial, financial and agricultural: Commercial, financial and agricultural loans are made for a wide variety of general corporate purposes, including financing for commercial and industrial businesses, financing for equipment, inventories and accounts receivable, acquisition financing and commercial leasing. The term of each commercial loan varies by its purpose. Repayment terms are structured such that commercial loans will be repaid within the economic useful life of the underlying asset. The commercial loan portfolio includes loans to a wide variety of corporations and businesses across many industrial classifications originated in the 28 Ohio counties where PNB operates. The primary industries represented by these customers include manufacturing, retail trade, health care and other services. Commercial real estate: Commercial real estate (“CRE”) loans include mortgage loans to developers and owners of commercial real estate. The lending policy for CRE loans is designed to address the unique risk attributes of CRE lending. The collateral for these CRE loans is the underlying commercial real estate. Construction real estate: The Company defines construction loans as both commercial construction loans and residential construction loans where the loan proceeds are used exclusively for the improvement of real estate as to which the Company holds a mortgage. Construction loans may be in the form of a permanent loan or short-term construction loan, depending on the needs of the individual borrower. Construction financing is generally considered to involve a higher degree of risk of loss than long-term financing on improved, occupied real estate. Risk of loss on a construction loan depends largely upon the accuracy of the initial estimate of the property’s value at completion of construction and the estimated cost (including interest) of construction. If the estimate of construction cost proves to be inaccurate, the PNB division making the loan may be required to advance funds beyond the amount originally committed to permit completion of the project. If the estimate of value proves inaccurate, the PNB division may be confronted, at or prior to the maturity of the loan, with a project having a value insufficient to assure full repayment, should the borrower default. In the event that a default on a construction loan occurs and foreclosure follows, the PNB division must take control of the project and attempt to either arrange for completion of construction or dispose of the unfinished project. Additional risk exists with respect to loans made to developers who do not have a buyer for the property, as the developer may lack funds to pay the loan if the property is not sold upon completion. PNB and its divisions attempt to reduce such risks on loans to developers by requiring personal guarantees and reviewing current personal financial statements and tax returns as well as other projects undertaken by the developer. Residential real estate: The Company defines residential real estate loans as first mortgages on individuals’ primary residences or second mortgages of individuals’ primary residences in the form of HELOCs or installment loans. Credit approval for residential real estate loans requires demonstration of sufficient income to repay the principal and interest and the real estate taxes and insurance, stability of employment, an established credit record and an appraised value of the real estate securing the loan. Consumer: The Company originates direct and indirect consumer loans, primarily automobile loans and home equity based lines of credit to customers in its primary market areas. Credit approval for consumer loans requires income sufficient to repay principal and interest due, stability of employment, an established credit record and sufficient collateral for secured loans. Consumer loans typically have shorter terms and lower balances with higher yields as compared to real estate mortgage loans, but generally carry higher risks of default. Consumer loan collections are dependent on the borrower’s financial stability, and thus are more likely to be affected by adverse personal circumstances. Allowance for Loan Losses The allowance for loan losses is that amount believed adequate to absorb probable incurred credit losses in the loan portfolio based on management’s evaluation of various factors. The determination of the allowance requires significant estimates, including the timing and amounts of expected cash flows on impaired loans, consideration of current economic conditions, and historical loss experience pertaining to pools of homogeneous loans, all of which may be susceptible to change. The allowance is increased through a provision for loan losses that is charged to earnings based on management’s quarterly evaluation of the factors previously mentioned and is reduced by charge-offs, net of recoveries. The allowance for loan losses includes both (1) an estimate of loss based on historical loss experience within both commercial and consumer loan categories with similar characteristics (“statistical allocation”) and (2) an estimate of loss based on an impairment analysis of each commercial loan that is considered to be impaired (“specific allocation”). In calculating the allowance for loan losses, management believes it is appropriate to utilize historical loss rates that are comparable to the current period being analyzed, giving consideration to losses experienced over a full cycle. For the historical loss factor at December 31, 2015 , the Company utilized an annual loss rate (“historical loss experience”), calculated based on an average of the net charge-offs and the annual change in specific reserves for impaired commercial loans, experienced during 2009 through 2015 within the individual segments of the commercial and consumer loan categories. Management believes the 84 -month historical loss experience methodology is appropriate in the current economic environment, as it captures loss rates consistent with current expectations based on current economic conditions. The loss factor applied to Park’s consumer portfolio as of December 31, 2015 was based on the historical loss experience over the past 84 months, plus an additional judgmental reserve, increasing the total allowance for loan loss coverage in the consumer portfolio to approximately 1.99 years of historical loss. The consumer loan portfolio loss coverage ratio was 1.98 years at December 31, 2014 . The loss factor applied to Park’s commercial portfolio as of December 31, 2015 was based on the historical loss experience over the past 84 months, plus additional reserves for consideration of (1) a loss emergence period factor, (2) a loss migration factor and (3) a judgmental or environmental loss factor. These additional reserves increased the total allowance for loan loss coverage in the commercial portfolio to approximately 2.52 years of historical loss at December 31, 2015. The commercial loan portfolio loss coverage ratio was 2.28 years at December 31, 2014 . Park’s commercial loans are individually risk graded. If loan downgrades occur, the probability of default increases and accordingly management allocates a higher percentage reserve to those accruing commercial loans graded special mention and substandard. The judgmental increases discussed above incorporate management’s evaluation of the impact of environmental qualitative factors which pose additional risks and assign a component of the allowance for loan losses in consideration of these factors. Such environmental factors include: national and local economic trends and conditions; experience, ability and depth of lending management and staff; effects of any changes in lending policies and procedures; and levels of, and trends in, consumer bankruptcies, delinquencies, impaired loans and charge-offs and recoveries. GAAP requires a specific allocation to be established as a component of the allowance for loan losses for certain loans when it is probable that all amounts due pursuant to the contractual terms of the loans will not be collected, and the recorded investment in the loans exceeds their measure of impairment. Management considers the following related to commercial loans when determining if a loan should be considered impaired : (1) current debt service coverage levels of the borrowing entity; (2) payment history over the most recent 12-month period; (3) other signs of deterioration in the borrower’s financial situation, such as changes in credit scores; and (4) consideration of global cash flows of financially sound guarantors that have previously supported loan payments. The recorded investment is the carrying balance of the loan, plus accrued interest receivable, both as of the end of the year. Impairment is measured using either the present value of expected future cash flows based upon the initial effective interest rate on the loan, or the fair value of the collateral. If a loan is considered to be collateral dependent, the fair value of collateral, less estimated selling costs, is used to measure impairment. Troubled Debt Restructuring ("TDRs") Management classifies loans as TDRs when a borrower is experiencing financial difficulty and Park has granted a concession. In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed of the probability that the borrower will be in payment default on any of the borrower's debt in the foreseeable future without the modification. This evaluation is performed under the Company’s internal underwriting policy. Management’s policy is to modify loans by extending the term or by granting a temporary or permanent contractual interest rate below the market rate, not by forgiving debt. A court's discharge of a borrower's debt in a Chapter 7 bankruptcy is considered a concession when the borrower does not reaffirm the discharged debt. TDRs are separately identified for impairment disclosures and are measured at the present value of estimated future cash flows using the loan’s effective rate at inception. If a TDR is considered to be a collateral dependent loan, the loan is reported, net, at the fair value of the collateral. Income Recognition Income earned by the Corporation and its subsidiaries is recognized on the accrual basis of accounting, except for nonaccrual loans as previously discussed, and late charges on loans which are recognized as income when they are collected. Premises and Equipment Land is carried at cost and is not subject to depreciation. Premises and equipment are carried at cost, less accumulated depreciation and amortization. Depreciation is generally provided on the straight-line method over the estimated useful lives of the related assets. Leasehold improvements are amortized over the shorter of the remaining lease period or the estimated useful lives of the improvements. Upon the sale or other disposal of an asset, the cost and related accumulated depreciation are removed from the accounts and the resulting gain or loss is recognized. Maintenance and repairs are charged to expense as incurred while renewals and improvements that extend the useful life of an asset are capitalized. Premises and equipment are evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount of a particular asset may not be recoverable. The range of depreciable lives over which premises and equipment are being depreciated are: Buildings 30 Years Equipment, furniture and fixtures 3 to 12 Years Leasehold improvements 1 to 10 Years Other Real Estate Owned Management transfers a loan to OREO at the time that Park takes deed/title of the asset. OREO is initially recorded at fair value less anticipated selling costs (net realizable value), establishing a new cost basis, and consists of property acquired through foreclosure and real estate held for sale. If the net realizable value is below the carrying value of the loan at the date of transfer, the difference is charged to the allowance for loan losses. These assets are subsequently accounted for at the lower of cost or fair value less costs to sell. Subsequent changes in the value of real estate are classified as OREO valuation adjustments, are reported as adjustments to the carrying amount of OREO and are recorded within “Other income”. In certain circumstances where management believes the devaluation may not be permanent in nature, Park utilizes a valuation allowance to record OREO devaluations, which is also expensed through “Other income”. Costs relating to development and improvement of such properties are capitalized (not in excess of fair value less estimated costs to sell) and costs relating to holding the properties are charged to "Other expense". Mortgage Servicing Rights ("MSR") When Park sells mortgage loans with servicing rights retained, servicing rights are recorded at an amount not to exceed fair value with the income statement effect recorded in "Other service income." Capitalized servicing rights are amortized in proportion to and over the period of the estimated future servicing income of the underlying loan and are included within “Other service income”. Mortgage servicing rights are assessed for impairment periodically, based on fair value, with any impairment recognized through a valuation allowance. The fair value of mortgage servicing rights is determined by discounting estimated future cash flows from the servicing assets, using market discount rates and expected future prepayment rates. In order to calculate fair value, the sold loan portfolio is stratified into homogeneous pools of like categories. (See Note 24 - Loan Servicing.) Fees received for servicing mortgage loans owned by investors are based on a percentage of the outstanding monthly principal balance of such loans and are included in income as loan payments are received. The cost of servicing loans is charged to expense as incurred. Goodwill Goodwill represents the excess of the purchase price over net identifiable tangible and intangible assets acquired in a purchase business combination. Other intangible assets represent purchased assets that have no physical property but represent some future economic benefit to their owner and are capable of being sold or exchanged on their own or in combination with a related asset or liability. Goodwill and indefinite-lived intangible assets are not amortized to expense, but are subject to impairment tests annually, or more frequently if events or changes in circumstances indicate that the asset might be impaired. Intangible assets with definitive useful lives (such as core deposit intangibles) are amortized to expense over their estimated useful lives. Management considers several factors when performing the annual impairment tests on goodwill. The factors considered include the operating results for the particular Park segment for the past year and the operating results budgeted for the current year (including multi-year projections), the deposit and loan totals of the Park segment and the economic conditions in the markets served by the Park segment. At December 31, 2015, the goodwill remaining on Park's Consolidated Balance Sheet consisted entirely of goodwill at PNB. (See Note 27 - Segment Information for operating segment results.) GAAP requires a company to perform an impairment test on goodwill annually, or more frequently if events or changes in circumstances indicate that the asset might be impaired, by assessing qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If after assessing these events or circumstances, it is concluded that it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test is unnecessary. If the carrying amount of the goodwill exceeds the fair value, an impairment charge must be recorded in an amount equal to the excess. Park evaluates goodwill for impairment on April 1 of each year, with financial data as of March 31. Based on the analysis performed as of April 1, 2015, the Company determined that goodwill for Park’s national bank subsidiary (PNB) was not impaired. There have been no subsequent circumstances or events triggering an additional evaluation. Consolidated Statement of Cash Flows Cash and cash equivalents include cash and cash items, amounts due from banks and money market instruments. Generally, money market instruments are purchased and sold for one-day periods. Loss Contingencies and Guarantees Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated. Income Taxes The Corporation accounts for income taxes using the asset and liability approach. Under this method, deferred tax assets and liabilities are determined based on differences between financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. To the extent that Park does not consider it more likely than not that a deferred tax asset will be recovered, a valuation allowance is recorded. All positive and negative evidence is reviewed when determining how much of a valuation allowance is recognized on a quarterly basis. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized. An uncertain tax position is recognized as a benefit only if it is “more-likely-than-not” that the tax position would be sustained in a tax examination being presumed to occur. The benefit recognized for a tax position that meets the “more-likely-than-not” criteria is measured based on the largest benefit that is more than 50 percent likely to be realized, taking into consideration the amounts and probabilities of the outcome upon settlement. For tax positions not meeting the “more-likely-than-not” test, no tax benefit is recorded. Park recognizes any interest and penalties related to income tax matters in income tax expense. Treasury Shares The purchase of Park’s common shares is recorded at cost. At the date of retirement or subsequent reissuance, the treasury shares account is reduced by the weighted average cost of the common shares retired or reissued. Comprehensive Income Comprehensive income consists of net income and other comprehensive income (loss). Other comprehensive income (loss) includes unrealized gains and losses on securities available for sale, and changes in the funded status of the Company’s defined benefit pension plan, which are also recognized as separate components of equity. Share-Based Compensation Compensation cost is recognized for restricted stock units and stock awards issued to employees and directors, based on the fair value of these awards at the date of grant. The market price of Park’s common shares at the date of grant is used to estimate the fair value of restricted stock units and stock awards. Compensation cost is recognized over the required service period, generally defined as the vesting period and is recorded in "Salaries" expense. (See Note 17 - Share - Based Compensation.) Loan Commitments and Related Financial Instruments Financial instruments include off‑balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded. Fair Value Measurement Fair values of financial instruments are estimated using relevant market information and other assumptions, as more fully disclosed in Note 25 - Fair Value . Fair value estimates involve uncertainties and matters of significant judgment regarding interest rates, credit risk, prepayments, and other factors, especially in the absence of broad markets for particular items. Changes in assumptions or in market conditions could significantly affect the estimates. Transfers of Financial Assets Transfers of financial assets are accounted for as sales, when control over the assets has been relinquished. Control over transferred assets is deemed to be surrendered when the assets have been isolated from the Company, the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity. Retirement Plans Pension expense is the net of service and interest cost, return on plan assets and amortization of gains and losses not immediately recognized. Employee KSOP plan expense is the amount of matching contributions to Park's employees stock ownership plan. Deferred compensation and supplemental retirement plan expense allocates the benefits over years of service. (See Note 18 - Benefit Plans.) Earnings Per Common Share Basic earnings per common share is net income available to common shareholders divided by the weighted average number of common shares outstanding during the period. Diluted earnings per common share includes the dilutive effect of additional potential common shares issuable under stock awards, stock options, warrants and convertible securities. Earnings and dividends per common share are restated for any stock splits and stock dividends through the date of issuance of the consolidated financial statements. (See Note 21 - Earnings Per Common Share.) Operating Segments The Corporation is a financial holding company headquartered in Newark, Ohio. The operating segments for the Corporation are its chartered national bank subsidiary, PNB (headquartered in Newark, Ohio), SE Property Holdings, LLC ("SEPH"), and Guardian Financial Services Company ("GFSC").

Adoption of New Accounting Pron

Adoption of New Accounting Pronouncements (Notes)	12 Months Ended
	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	Adoption of New Accounting Pronouncements ASU 2014-01- Investments-Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects (a consensus of the FASB Emerging Issues Task Force): In January 2014, the Financial Accounting Standards Board (the "FASB") issued ASU 2014-01, Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects (a consensus of the FASB Emerging Issues Task Force). The ASU permits reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense. Additionally, a reporting entity should disclose information that enables users of its financial statements to understand the nature of its investments in qualified affordable housing projects, and the effect of the measurement of its investments in qualified affordable housing projects and the related tax credits on its financial position and results of operations. The new guidance became effective for annual periods, and interim reporting periods within those annual periods, beginning after December 15, 2014. Park adopted this guidance in the first quarter of 2015. The guidance was applied retrospectively to all prior periods presented. The adoption resulted in adjustments to reduce beginning retained earnings, other assets and the prior periods consolidated statements of income. See Note 11 - Investment in Qualified Affordable Housing for further details. ASU 2014-04 - Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure (a consensus of the FASB Emerging Issues Task Force): In January 2014, FASB issued ASU 2014-04, Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure (a consensus of the FASB Emerging Issues Task Force). This new ASU clarifies when an in substance repossession or foreclosure occurs and a creditor is considered to have received physical possession of real estate property collateralizing a consumer mortgage loan. Specifically, the new ASU requires a creditor to reclassify a collateralized consumer mortgage loan to real estate property upon obtaining legal title to the real estate collateral, or the borrower voluntarily conveying all interest in the real estate property to the lender to satisfy the loan through a deed in lieu of foreclosure or similar legal agreement. Additional disclosures are required detailing the amount of foreclosed residential real estate property held by the creditor and the recorded investment in consumer mortgages collateralized by real estate property that are in the process of foreclosure. The new guidance is effective for annual periods, and interim reporting periods within those annual periods, beginning after December 15, 2014. The adoption of this guidance as of January 1, 2015 did not have a material impact on Park's consolidated financial statements, but resulted in additional disclosures. See Note 9 - Other Real Estate Owned. ASU 2014-09 - Revenue from Contracts with Customers (Topic 606): In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) . The ASU creates a new topic, Topic 606, to provide guidance on revenue recognition for entities that enter into contracts with customers to transfer goods or services or enter into contracts for the transfer of nonfinancial assets. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Additional disclosures are required to provide quantitative and qualitative information regarding the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The new guidance is effective for annual reporting periods, and interim reporting periods within those annual periods, beginning after December 15, 2017. Management is currently evaluating the impact of the adoption of this guidance on Park's consolidated financial statements. ASU 2014-11 - Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures: In June 2014, the FASB issued ASU 2014-11, Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures . The amendments in this ASU change the accounting for repurchase-to-maturity transactions and linked repurchase financings to secured borrowing accounting, which is consistent with the accounting for other repurchase agreements. The amendments also require two new disclosures. The first disclosure requires an entity to disclose information on transfers accounted for as sales in transactions that are economically similar to repurchase agreements. The second disclosure provides increased transparency about the types of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings. The accounting changes are effective for annual periods, and interim reporting periods within those annual periods, beginning after December 15, 2014. The disclosure for certain transactions accounted for as a sale is required to be presented for interim and annual periods beginning after December 15, 2014, with all other disclosure requirements required to be presented for annual periods beginning after December 15, 2014, and for interim periods beginning after March 15, 2015. The adoption of this guidance as of January 1, 2015 did not have an impact on Park's consolidated financial statements, but resulted in additional disclosures. See Note 13 - Repurchase Agreement Borrowings. ASU 2015-02 - Consolidation (Topic 810): Amendments to the Consolidation Analysis : In February 2015, the FASB issued ASU 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis. The ASU amends the current consolidation guidance and affects both the variable interest entity and voting interest entity consolidation models. The new guidance is effective for annual reporting periods and interim reporting periods within those annual periods, beginning after December 15, 2015. Early adoption is permitted. Management is currently evaluating the impact of the adoption of this guidance on Park’s consolidated financial statements. ASU 2016-01 - Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. In January 2016, the FASB issued ASU 2016-01 - Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities . Changes to the current GAAP model primarily affects the accounting for equity investments, financial liabilities under the fair value option, and the presentation and disclosure requirements for financial instruments. In addition, the ASU clarifies guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale securities. The new guidance is effective for annual reporting period and interim reporting periods within those annual periods, beginning after December 15, 2017. Management is currently evaluating the impact of the adoption of this guidance on Park’s consolidated financial statements.

Organization

Organization	12 Months Ended
	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization Park National Corporation is a financial holding company headquartered in Newark, Ohio. Through its national bank subsidiary, PNB, Park is engaged in a general commercial banking and trust business, primarily in Ohio. PNB operates through eleven banking divisions with the Park National Bank Division headquartered in Newark, Ohio, the Fairfield National Bank Division headquartered in Lancaster, Ohio, The Park National Bank of Southwest Ohio & Northern Kentucky Division headquartered in Cincinnati, Ohio, the First-Knox National Bank Division headquartered in Mount Vernon, Ohio, the Farmers Bank Division headquartered in Loudonville, Ohio, the Security National Bank Division headquartered in Springfield, Ohio, the Unity National Bank Division headquartered in Piqua, Ohio, the Richland Bank Division headquartered in Mansfield, Ohio, the Century National Bank Division headquartered in Zanesville, Ohio, the United Bank, N.A. Division headquartered in Bucyrus, Ohio and the Second National Bank Division headquartered in Greenville, Ohio. A wholly-owned subsidiary of Park, GFSC is a consumer finance company located in Central Ohio. Through February 16, 2012, Park operated a second banking subsidiary, Vision Bank ("Vision"), which was engaged in a general commercial banking business, primarily in Baldwin County, Alabama and the panhandle of Florida. Vision operated through two banking divisions with the Vision Bank Florida Division headquartered in Panama City, Florida and the Vision Bank Alabama Division headquartered in Gulf Shores, Alabama. Promptly following the sale of the Vision business to Centennial Bank (a wholly-owned subsidiary of HomeBanc Shares, Inc.), Vision surrendered its Florida banking charter to the Florida Office of Financial Regulation and became a non-bank Florida corporation. Vision (the Florida corporation) merged with and into a wholly-owned, non-bank subsidiary of Park, SEPH, with SEPH being the surviving entity. SEPH holds the remaining assets and liabilities retained by Vision subsequent to the sale. SEPH also holds OREO that had previously been transferred to SEPH from Vision. SEPH's assets consist primarily of performing and nonperforming loans and OREO. This segment represents a run off portfolio of the legacy Vision assets. All of the Ohio-based banking divisions provide the following principal services: the acceptance of deposits for demand, savings and time accounts; commercial, industrial, consumer and real estate lending, including installment loans, credit cards, home equity lines of credit; trust services; cash management; safe deposit operations; electronic funds transfers and a variety of additional banking-related services. See Note 27 - Segment Information for financial information on the Corporation’s operating segments.

Goodwill (Notes)

Goodwill (Notes)	12 Months Ended
	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure [Text Block]	Goodwill The following table reflects the activity in goodwill and other intangible assets for the years ended December 31, 2015 , 2014 and 2013 . (In thousands) Goodwill Core Deposit Intangibles Total January 1, 2013 $ 72,334 $ 337 $ 72,671 Amortization — (337 ) (337 ) December 31, 2013 $ 72,334 $ — $ 72,334 Amortization — — — December 31, 2014 $ 72,334 $ — $ 72,334 Amortization — — — December 31, 2015 $ 72,334 $ — $ 72,334 The core deposit intangibles were amortized to expense principally on the straight-line method, over a period of six years. Core deposit intangibles were fully amortized at December 31, 2013 , and thus there was no amortization expense in 2014 or 2015 . Core deposit intangible amortization expense was $337,000 in 2013 .

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investments Securities	Investment Securities The amortized cost and fair value of investment securities are shown in the following table. Management performs a quarterly evaluation of investment securities for any other-than-temporary impairment. During 2015 and 2014, there were no investment securities deemed to be other-than-temporarily impaired. During 2013, Park recognized other-than-temporary impairment charges of $17,000 , related to an equity investment in a financial institution. Investment securities at December 31, 2015 and December 31, 2014 were as follows: (In thousands) Amortized Cost Gross Unrealized/Unrecognized Holding Gains Gross Unrealized/Unrecognized Holding Losses Estimated Fair Value 2015: Securities Available-for-Sale Obligations of U.S. Treasury and other U.S. Government sponsored entities $ 527,605 $ — $ 5,542 $ 522,063 U.S. Government sponsored entities’ asset-backed securities 907,989 8,776 5,272 911,493 Other equity securities 1,120 1,590 — 2,710 Total $ 1,436,714 $ 10,366 $ 10,814 $ 1,436,266 2015: Securities Held-to-Maturity Obligations of states and political subdivisions $ 48,190 $ 734 $ — $ 48,924 U.S. Government sponsored entities’ asset-backed securities 101,112 1,526 134 102,504 Total $ 149,302 $ 2,260 $ 134 $ 151,428 (In thousands) Amortized Cost Gross Unrealized/Unrecognized Holding Gains Gross Unrealized/Unrecognized Holding Losses Estimated Fair Value 2014: Securities Available-for-Sale Obligations of U.S. Treasury and other U.S. Government sponsored entities $ 546,886 $ 11 $ 8,833 $ 538,064 U.S. Government sponsored entities’ asset-backed securities 751,974 13,421 4,242 761,153 Other equity securities 1,120 1,578 — 2,698 Total $ 1,299,980 $ 15,010 $ 13,075 $ 1,301,915 2014: Securities Held-to-Maturity U.S. Government sponsored entities’ asset-backed securities $ 140,562 $ 3,088 $ 160 $ 143,490 Park’s U.S. Government sponsored entities' asset-backed securities consisted of 15 -year mortgage-backed securities and collateralized mortgage obligations (CMOs). At December 31, 2015 , the amortized cost of Park’s available-for-sale mortgage-backed securities was $569.0 million and there were no held-to-maturity mortgage-backed securities within Park's investment portfolio. At December 31, 2015 , the amortized cost of Park's available-for-sale and held-to-maturity CMOs was $339.0 million and $101.1 million , respectively. The following table provides detail on investment securities with unrealized losses aggregated by investment category and length of time the individual securities had been in a continuous loss position at December 31, 2015 and December 31, 2014 : Less than 12 Months 12 Months or Longer Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses 2015: Securities Available-for-Sale Obligations of U.S. Treasury and other U.S. Government sponsored entities $ 326,973 $ 2,117 $ 195,090 $ 3,425 $ 522,063 $ 5,542 U.S. Government sponsored entities' asset-backed securities 384,169 2,776 114,543 2,496 498,712 5,272 Total $ 711,142 $ 4,893 $ 309,633 $ 5,921 $ 1,020,775 $ 10,814 2015: Securities Held-to-Maturity U.S. Government sponsored entities’ asset-backed securities $ 5,656 $ 10 $ 7,792 $ 124 $ 13,448 $ 134 Less than 12 Months 12 Months or Longer Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses 2014: Securities Available-for-Sale Obligations of U.S. Treasury and other U.S. Government sponsored entities $ 119,913 $ 87 $ 388,140 $ 8,746 $ 508,053 $ 8,833 U.S. Government sponsored entities' asset-backed securities 73,276 136 170,430 4,106 243,706 4,242 Total $ 193,189 $ 223 $ 558,570 $ 12,852 $ 751,759 $ 13,075 2014: Securities Held-to-Maturity U.S. Government sponsored entities' asset-backed securities $ 8,032 $ 148 $ 2,714 $ 12 $ 10,746 $ 160 Management does not believe any individual unrealized loss as of December 31, 2015 or 2014 represented an other-than-temporary impairment. The unrealized losses on debt securities are primarily the result of interest rate changes. These conditions will not prohibit Park from receiving its contractual principal and interest payments on these debt securities. The fair value of these debt securities is expected to recover as payments are received on these securities and they approach maturity. Should the impairment of any of these securities become other-than-temporary, the cost basis of the investment will be reduced and the resulting loss recognized in net income in the period the other-than-temporary impairment is identified. Other investment securities (as shown on the Consolidated Balance Sheets) consist of stock investments in the FHLB and the FRB. These restricted stock investments are carried at their redemption value. Park owned $50.1 million of FHLB stock and $8.2 million of FRB stock at both December 31, 2015 and December 31, 2014 , respectively. The amortized cost and estimated fair value of investments in debt securities at December 31, 2015 , are shown in the following table by contractual maturity, except for asset-backed securities, which are shown as a single total, due to the unpredictability of the timing in principal repayments. (In thousands) Amortized Cost Estimated Fair Value Tax Equivalent Yield Securities Available-for-Sale U.S. Treasury and other U.S. Government sponsored entities’ notes: Due one through five years $ 220,000 $ 219,135 1.29 % Due five through ten years 307,605 302,928 2.40 % Total $ 527,605 $ 522,063 1.94 % U.S. Government sponsored entities’ asset-backed securities $ 907,989 $ 911,493 2.23 % Securities Held-to-Maturity Obligations of states and political subdivisions Due greater than ten years $ 48,190 $ 48,924 4.65 % Total $ 48,190 $ 48,924 4.65 % U.S. Government sponsored entities’ asset-backed securities $ 101,112 $ 102,504 3.42 % Approximately $527.6 million of Park’s securities shown in the above table as U.S. Treasury and other U.S. Government sponsored entities' notes are callable notes. These callable securities have a final maturity of 1 to 7 years. The remaining weighted average life of the investment portfolio is 4.8 years. Investment securities having an amortized cost of $1,072 million and $1,205 million at December 31, 2015 and 2014 , respectively, were pledged to collateralize government and trust department deposits in accordance with federal and state requirements, to secure repurchase agreements sold and as collateral for FHLB advance borrowings. At December 31, 2015 , $429 million was pledged for government and trust department deposits, $622 million was pledged to secure repurchase agreements and $21 million was pledged as collateral for FHLB advance borrowings. At December 31, 2014 , $513 million was pledged for government and trust department deposits, $664 million was pledged to secure repurchase agreements and $28 million was pledged as collateral for FHLB advance borrowings. At December 31, 2015 , there were no holdings of securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of shareholders’ equity. During 2015, Park sold certain HFS investment securities with a book value of $3.1 million at a gain of $88,000 . These securities had been paid down to 97.8% of the principal outstanding at acquisition. During 2014, Park sold investment securities with a book value of $187,000 at a gain of $22,000 . Additionally, Park sold investment securities with a book value of $174.1 million at a loss of $1.2 million . During 2013, Park sold $75.0 million of securities at book value for no gain.

Loans

Loans	12 Months Ended
	Dec. 31, 2015
Loans and Leases Receivable Disclosure [Abstract]
Loans	Loans The composition of the loan portfolio, by class of loan, as of December 31, 2015 and December 31, 2014 was as follows: 12/31/2015 12/31/2014 (In thousands) Loan Balance Accrued Interest Receivable Recorded Investment Loan Balance Accrued Interest Receivable Recorded Investment Commercial, financial and agricultural * $ 955,727 $ 3,437 $ 959,164 $ 856,535 $ 3,218 $ 859,753 Commercial real estate * 1,113,603 4,009 1,117,612 1,069,637 3,546 1,073,183 Construction real estate: SEPH commercial land and development 2,044 — 2,044 2,195 — 2,195 Remaining commercial 128,046 321 128,367 115,139 300 115,439 Mortgage 36,722 75 36,797 31,148 72 31,220 Installment 6,533 21 6,554 7,322 23 7,345 Residential real estate: Commercial 410,571 1,014 411,585 417,612 1,038 418,650 Mortgage 1,210,819 1,469 1,212,288 1,189,709 1,548 1,191,257 HELOC 211,415 769 212,184 216,915 803 217,718 Installment 22,638 78 22,716 27,139 97 27,236 Consumer 967,111 3,032 970,143 893,160 2,967 896,127 Leases 2,856 14 2,870 3,171 17 3,188 Total loans $ 5,068,085 $ 14,239 $ 5,082,324 $ 4,829,682 $ 13,629 $ 4,843,311 * Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class. Loans are shown net of deferred origination fees, costs and unearned income of $10.4 million at December 31, 2015 and $9.4 million at December 31, 2014 , which represented a net deferred income position in both years. Overdrawn deposit accounts of $1.7 million and $2.3 million have been reclassified to loans at December 31, 2015 and 2014 , respectively, and are included in the commercial, financial and agricultural loan class above. Credit Quality The following table presents the recorded investment in nonaccrual loans, accruing troubled debt restructurings ("TDRs"), and loans past due 90 days or more and still accruing by class of loan as of December 31, 2015 and December 31, 2014 : 12/31/2015 (In thousands) Nonaccrual Loans Accruing Troubled Debt Restructurings Loans Past Due 90 Days or More and Accruing Total Nonperforming Loans Commercial, financial and agricultural $ 21,676 $ 8,947 $ — $ 30,623 Commercial real estate 15,268 2,757 — 18,025 Construction real estate: SEPH commercial land and development 2,044 — — 2,044 Remaining commercial 4,162 514 — 4,676 Mortgage 7 110 — 117 Installment 64 114 — 178 Residential real estate: Commercial 25,063 261 — 25,324 Mortgage 20,378 10,143 851 31,372 HELOC 1,749 873 27 2,649 Installment 1,657 635 4 2,296 Consumer 3,819 734 1,093 5,646 Total loans $ 95,887 $ 25,088 $ 1,975 $ 122,950 12/31/2014 (In thousands) Nonaccrual Loans Accruing Troubled Debt Restructurings Loans Past Due 90 Days or More and Accruing Total Nonperforming Loans Commercial, financial and agricultural $ 18,826 $ 297 $ 229 $ 19,352 Commercial real estate 19,299 2,690 — 21,989 Construction real estate: SEPH commercial land and development 2,078 — — 2,078 Remaining commercial 5,558 51 — 5,609 Mortgage 59 94 9 162 Installment 115 125 — 240 Residential real estate: Commercial 24,336 594 — 24,930 Mortgage 21,869 10,349 1,329 33,547 HELOC 1,879 630 9 2,518 Installment 1,743 779 — 2,522 Consumer 4,631 723 1,133 6,487 Total loans $ 100,393 $ 16,332 $ 2,709 $ 119,434 The following table provides additional information regarding those nonaccrual and accruing TDR loans that are individually evaluated for impairment and those collectively evaluated for impairment as of December 31, 2015 and December 31, 2014 . 12/31/2015 12/31/2014 (In thousands) Nonaccrual and accruing TDRs Loans individually evaluated for impairment Loans collectively evaluated for impairment Nonaccrual and accruing TDRs Loans individually evaluated for impairment Loans collectively evaluated for impairment Commercial, financial and agricultural $ 30,623 $ 30,595 $ 28 $ 19,123 $ 19,106 $ 17 Commercial real estate 18,025 18,025 — 21,989 21,989 — Construction real estate: SEPH commercial land and development 2,044 2,044 — 2,078 2,078 — Remaining commercial 4,676 4,676 — 5,609 5,609 — Mortgage 117 — 117 153 — 153 Installment 178 — 178 240 — 240 Residential real estate: Commercial 25,324 25,324 — 24,930 24,930 — Mortgage 30,521 — 30,521 32,218 — 32,218 HELOC 2,622 — 2,622 2,509 — 2,509 Installment 2,292 — 2,292 2,522 — 2,522 Consumer 4,553 — 4,553 5,354 — 5,354 Total loans $ 120,975 $ 80,664 $ 40,311 $ 116,725 $ 73,712 $ 43,013 All of the loans individually evaluated for impairment were evaluated using the fair value of the collateral or the present value of expected future cash flows as the measurement method. The following table presents loans individually evaluated for impairment by class of loan as of December 31, 2015 and December 31, 2014 . 12/31/2015 12/31/2014 (In thousands) Unpaid principal balance Recorded investment Allowance for loan losses allocated Unpaid principal balance Recorded investment Allowance for loan losses allocated With no related allowance recorded Commercial, financial and agricultural $ 32,583 $ 18,763 $ — $ 30,601 $ 17,883 $ — Commercial real estate 15,138 14,916 — 27,923 20,696 — Construction real estate: SEPH commercial land and development 10,834 2,044 — 11,026 2,078 — Remaining commercial 2,506 1,531 — 1,427 391 — Residential real estate: Commercial 23,798 23,480 — 25,822 23,352 — With an allowance recorded Commercial, financial and agricultural 16,155 11,832 1,904 1,251 1,223 981 Commercial real estate 3,195 3,109 381 1,310 1,293 262 Construction real estate: Remaining commercial 3,145 3,145 1,356 5,218 5,218 1,812 Residential real estate: Commercial 1,951 1,844 550 1,578 1,578 605 Total $ 109,305 $ 80,664 $ 4,191 $ 106,156 $ 73,712 $ 3,660 Management’s general practice is to proactively charge down loans individually evaluated for impairment to the fair value of the underlying collateral. At December 31, 2015 and December 31, 2014 , there were $24.2 million and $32.4 million , respectively, of partial charge-offs on loans individually evaluated for impairment with no related allowance recorded and $4.5 million and $45,000 , respectively, of partial charge-offs on loans individually evaluated for impairment that also had a specific reserve allocated. The allowance for loan losses included specific reserves related to loans individually evaluated for impairment at December 31, 2015 and 2014 , of $4.2 million and $3.7 million , respectively. These loans with specific reserves had a recorded investment of $19.9 million and $9.3 million as of December 31, 2015 and 2014 , respectively. Interest income on loans individually evaluated for impairment is recognized on a cash basis only when Park expects to receive the entire recorded investment of the loan. The following tables present the average recorded investment and interest income recognized subsequent to impairment on loans individually evaluated for impairment as of and for the years ended December 31, 2015 , 2014 , and 2013 : Year ended December 31, 2015 (In thousands) Recorded Investment as of December 31, 2015 Average recorded investment Interest income recognized Commercial, financial and agricultural $ 30,595 $ 20,179 $ 340 Commercial real estate 18,025 17,883 550 Construction real estate: SEPH commercial land and development 2,044 2,066 21 Remaining commercial 4,676 5,666 26 Residential real estate: Commercial 25,324 24,968 1,026 Consumer — — — Total $ 80,664 $ 70,762 $ 1,963 Year ended December 31, 2014 (In thousands) Recorded Investment as of December 31, 2014 Average recorded investment Interest income recognized Commercial, financial and agricultural $ 19,106 $ 19,518 $ 360 Commercial real estate 21,989 31,945 1,027 Construction real estate: SEPH commercial land and development 2,078 3,658 146 Remaining commercial 5,609 8,784 61 Residential real estate: Commercial 24,930 28,306 1,084 Consumer — 403 — Total $ 73,712 $ 92,614 $ 2,678 Year ended December 31, 2013 (In thousands) Recorded Investment as of December 31, 2013 Average recorded investment Interest income recognized Commercial, financial and agricultural $ 20,727 $ 20,523 $ 412 Commercial real estate 41,822 41,426 1,151 Construction real estate: SEPH commercial land and development 4,777 8,723 — Remaining commercial 10,782 17,829 616 Residential real estate: Commercial 33,408 34,972 461 Consumer 799 616 — Total $ 112,315 $ 124,089 $ 2,640 The following tables present the aging of the recorded investment in past due loans as of December 31, 2015 and December 31, 2014 by class of loan. 12/31/2015 (In thousands) Accruing loans past due 30-89 days Past due nonaccrual loans and loans past due 90 days or more and accruing * Total past due Total current Total recorded investment Commercial, financial and agricultural $ 670 $ 7,536 $ 8,206 $ 950,958 $ 959,164 Commercial real estate 142 530 672 1,116,940 1,117,612 Construction real estate: SEPH commercial land and development — 2,044 2,044 — 2,044 Remaining commercial 165 84 249 128,118 128,367 Mortgage 63 7 70 36,727 36,797 Installment 200 46 246 6,308 6,554 Residential real estate: Commercial 325 19,521 19,846 391,739 411,585 Mortgage 10,569 8,735 19,304 1,192,984 1,212,288 HELOC 487 186 673 211,511 212,184 Installment 426 318 744 21,972 22,716 Consumer 11,458 3,376 14,834 955,309 970,143 Leases — — — 2,870 2,870 Total loans $ 24,505 $ 42,383 $ 66,888 $ 5,015,436 $ 5,082,324 * Includes $2.0 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans. 12/31/2014 (In thousands) Accruing loans past due 30-89 days Past due nonaccrual loans and loans past due 90 days or more and accruing * Total past due Total current Total recorded investment Commercial, financial and agricultural $ 6,482 $ 7,508 $ 13,990 $ 845,763 $ 859,753 Commercial real estate 808 8,288 9,096 1,064,087 1,073,183 Construction real estate: SEPH commercial land and development — 2,068 2,068 127 2,195 Remaining commercial 166 77 243 115,196 115,439 Mortgage 39 68 107 31,113 31,220 Installment 21 25 46 7,299 7,345 Residential real estate: Commercial 250 19,592 19,842 398,808 418,650 Mortgage 11,146 10,637 21,783 1,169,474 1,191,257 HELOC 262 387 649 217,069 217,718 Installment 596 464 1,060 26,176 27,236 Consumer 11,304 3,818 15,122 881,005 896,127 Leases — — — 3,188 3,188 Total loans $ 31,074 $ 52,932 $ 84,006 $ 4,759,305 $ 4,843,311 * Includes $2.7 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans. Credit Quality Indicators Management utilizes past due information as a credit quality indicator across the loan portfolio. Past due information as of December 31, 2015 and 2014 is included in the tables above. The past due information is the primary credit quality indicator within the following classes of loans: (1) mortgage loans and installment loans in the construction real estate segment; (2) mortgage loans, HELOC and installment loans in the residential real estate segment; and (3) consumer loans. The primary credit indicator for commercial loans is based on an internal grading system that grades all commercial loans on a scale from 1 to 8. Credit grades are continuously monitored by the responsible loan officer and adjustments are made when appropriate. A grade of 1 indicates little or no credit risk and a grade of 8 is considered a loss. Commercial loans that are pass-rated (graded a 1 through a 4) are considered to be of acceptable credit risk. Commercial loans graded a 5 (special mention) are considered to be watch list credits and a higher loan loss reserve percentage is allocated to these loans. Loans classified as special mention have potential weaknesses that require management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of Park’s credit position at some future date. Commercial loans graded 6 (substandard), also considered watch list credits, are considered to represent higher credit risk and, as a result, a higher loan loss reserve percentage is allocated to these loans. Loans classified as substandard are inadequately protected by the current sound worth and paying capacity of the obligor or the value of the collateral pledged, if any. Loans so classified have a well defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that Park will sustain some loss if the deficiencies are not corrected. Commercial loans that are graded a 7 (doubtful) are shown as nonaccrual and Park generally charges these loans down to their fair value by taking a partial charge-off or recording a specific reserve. Loans classified as doubtful have all the weaknesses inherent in those classified as substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. Certain 6-rated loans and all 7-rated loans are included within the impaired category. A loan is deemed impaired when management determines the borrower's ability to perform in accordance with the contractual loan agreement is in doubt. Any commercial loan graded an 8 (loss) is completely charged off. The tables below present the recorded investment by loan grade at December 31, 2015 and December 31, 2014 for all commercial loans: 12/31/2015 (In thousands) 5 Rated 6 Rated Impaired Pass Rated Recorded Investment Commercial, financial and agricultural* $ 4,392 $ 347 $ 30,623 $ 923,802 $ 959,164 Commercial real estate* 14,880 3,417 18,025 1,081,290 1,117,612 Construction real estate: SEPH commercial land and development — — 2,044 — 2,044 Remaining commercial 2,151 122 4,676 121,418 128,367 Residential real estate: Commercial 3,280 386 25,324 382,595 411,585 Leases — — — 2,870 2,870 Total Commercial Loans $ 24,703 $ 4,272 $ 80,692 $ 2,511,975 $ 2,621,642 * Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class. 12/31/2014 (In thousands) 5 Rated 6 Rated Impaired Pass Rated Recorded Investment Commercial, financial and agricultural* $ 1,874 $ 1,201 $ 19,123 $ 837,555 $ 859,753 Commercial real estate* 8,448 1,712 21,989 1,041,034 1,073,183 Construction real estate: SEPH commercial land and development — — 2,078 117 2,195 Remaining commercial 3,349 57 5,609 106,424 115,439 Residential real estate: Commercial 2,581 598 24,930 390,541 418,650 Leases — — — 3,188 3,188 Total Commercial Loans $ 16,252 $ 3,568 $ 73,729 $ 2,378,859 $ 2,472,408 * Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class. Troubled Debt Restructuring Management classifies loans as TDRs when a borrower is experiencing financial difficulties and Park has granted a concession to the borrower as part of a modification or in the loan renewal process. In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed of the probability that the borrower will be in payment default on any of the borrower's debt in the foreseeable future without the modification. This evaluation is performed in accordance with the Company’s internal underwriting policy. Management’s policy is to modify loans by extending the term or by granting a temporary or permanent contractual interest rate below the market rate, not by forgiving debt. A court's discharge of a borrower's debt in a Chapter 7 bankruptcy is considered a concession when the borrower does not reaffirm the discharged debt. Certain loans which were modified during the years ended December 31, 2015 and December 31, 2014 did not meet the definition of a TDR as the modification was a delay in a payment that was considered to be insignificant. Management considers a forbearance period of up to three months or a delay in payment of up to 30 days to be insignificant. TDRs may be classified as accruing if the borrower has been current for a period of at least six months with respect to loan payments and management expects that the borrower will be able to continue to make payments in accordance with the terms of the restructured note. Management reviews all accruing TDRs quarterly to ensure payments continue to be made in accordance with the modified terms. Management reviews renewals/modifications of loans previously identified as TDRs to consider if it is appropriate to remove the TDR classification. If the borrower is no longer experiencing financial difficulty and the renewal/modification does not contain a concessionary interest rate or other concessionary terms, management considers the potential removal of the TDR classification. If deemed appropriate, the TDR classification is removed as the borrower has complied with the terms of the loan at the date of the renewal/modification and there was a reasonable expectation that the borrower would continue to comply with the terms of the loan subsequent to the date of the renewal/modification. The majority of these TDRs were originally considered restructurings in a prior year as a result of a renewal/modification with an interest rate that was not commensurate with the risk of the underlying loan at the time of the renewal/modification. During the years ended December 31, 2015 and 2014 , Park removed the TDR classification on $1.2 million and $2.5 million , respectively, of loans that met the requirements discussed above. At December 31, 2015 and 2014 , there were $41.1 million and $47.5 million , respectively, of TDRs included in the nonaccrual loan totals. At December 31, 2015 and 2014 , $19.1 million and $15.7 million , respectively, of these nonaccrual TDRs were performing in accordance with the terms of the restructured note. As of December 31, 2015 and 2014 , there were $25.1 million and $16.3 million , respectively, of TDRs included in accruing loan totals. Management will continue to review the restructured loans and may determine it appropriate to move certain nonaccrual TDRs to accrual status in the future. At December 31, 2015 and 2014 , Park had commitments to lend $2.3 million and $1.4 million , respectively, of additional funds to borrowers whose outstanding loan terms had been modified in a TDR. The specific reserve related to TDRs at December 31, 2015 and 2014 was $2.3 million and $2.4 million , respectively. Modifications made in 2014 and 2015 were largely the result of renewals, extending the maturity date of the loan, at terms consistent with the original note. These modifications were deemed to be TDRs primarily due to Park’s conclusion that the borrower would likely not have qualified for similar terms through another lender. Many of the modifications deemed to be TDRs were previously identified as impaired loans, and thus were also previously evaluated for impairment under ASC 310. Additional specific reserves of $1.3 million were recorded during the year ended December 31, 2015 , as a result of TDRs identified in the 2015 year. Additional specific reserves of $0.7 million were recorded during the year ended December 31, 2014 as a result of TDRs identified in the 2014 year. Additional specific reserves of $1.1 million were recorded during the year ended December 31, 2013 as a result of TDRs identified in the 2013 year. The terms of certain other loans were modified during the years ended December 31, 2015 and 2014 that did not meet the definition of a TDR. Modified substandard commercial loans which did not meet the definition of a TDR had a total recorded investment as of December 31, 2015 and 2014 of $116,000 and $987,000 , respectively. The renewal/modification of these loans: (1) involved a renewal/modification of the terms of a loan to a borrower who was not experiencing financial difficulties, (2) resulted in a delay in a payment that was considered to be insignificant, or (3) resulted in Park obtaining additional collateral or guarantees that improved the likelihood of the ultimate collection of the loan such that the modification was deemed to be at market terms. Modified consumer loans which did not meet the definition of a TDR had a total recorded investment as of December 31, 2015 and 2014 of $16.5 million and $19.9 million , respectively. Many of these loans were to borrowers who were not experiencing financial difficulties but who were looking to reduce their cost of funds. The following tables detail the number of contracts modified as TDRs during the years ended December 31, 2015 , 2014 and 2013 as well as the recorded investment of these contracts at December 31, 2015 , 2014 , and 2013. The recorded investment pre- and post-modification is generally the same due to the fact that Park does not typically forgive principal. Year ended December 31, 2015 (In thousands) Number of Contracts Accruing Nonaccrual Recorded Investment Commercial, financial and agricultural 39 $ 8,948 $ 3,640 $ 12,588 Commercial real estate 14 637 3,523 4,160 Construction real estate: SEPH commercial land and development — — — — Remaining commercial 2 513 — 513 Mortgage 1 19 — 19 Installment — — — — Residential real estate: Commercial 11 — 1,185 1,185 Mortgage 39 1,132 2,122 3,254 HELOC 26 315 45 360 Installment 9 — 155 155 Consumer 283 202 888 1,090 Total loans 424 $ 11,766 $ 11,558 $ 23,324 Year ended December 31, 2014 (In thousands) Number of Contracts Accruing Nonaccrual Recorded Investment Commercial, financial and agricultural 30 $ 292 $ 431 $ 723 Commercial real estate 11 1,184 1,254 2,438 Construction real estate: SEPH commercial land and development — — — — Remaining commercial 2 — 206 206 Mortgage — — — — Installment 2 — 56 56 Residential real estate: Commercial 9 — 866 866 Mortgage 46 32 2,325 2,357 HELOC 10 85 241 326 Installment 10 109 12 121 Consumer 330 244 1,058 1,302 Total loans 450 $ 1,946 $ 6,449 $ 8,395 Year ended December 31, 2013 (In thousands) Number of Contracts Accruing Nonaccrual Recorded Investment Commercial, financial and agricultural 34 $ 7 $ 1,334 $ 1,341 Commercial real estate 22 — 8,563 8,563 Construction real estate: SEPH commercial land and development — — — — Remaining commercial 3 — 98 98 Mortgage — — — — Installment 4 26 25 51 Residential real estate: Commercial 15 — 2,552 2,552 Mortgage 62 1,967 2,278 4,245 HELOC 16 175 — 175 Installment 13 113 179 292 Consumer 327 805 345 1,150 Total loans 496 $ 3,093 $ 15,374 $ 18,467 Of those loans which were modified and determined to be a TDR during the year ended December 31, 2015 , $0.8 million were on nonaccrual status as of December 31, 2014 . Of those loans which were modified and determined to be a TDR during the year ended December 31, 2014 , $0.7 million were on nonaccrual status as of December 31, 2013 . Of those loans which were modified and determined to be a TDR during the year ended December 31, 2013, $5.5 million were on nonaccrual status as of December 31, 2012. The following table presents the recorded investment in financing receivables which were modified as TDRs within the previous 12 months and for which there was a payment default during the year ended December 31, 2015 , December 31, 2014 , and December 31, 2013. For this table, a loan is considered to be in default when it becomes 30 days contractually past due under modified terms. The additional allowance for loan loss resulting from the defaults on TDR loans was immaterial. Year ended December 31, 2015 Year ended December 31, 2014 Year ended December 31, 2013 (In thousands) Number of Contracts Recorded Investment Number of Contracts Recorded Investment Number of Contracts Recorded Investment Commercial, financial and agricultural 1 $ 1 4 $ 206 11 $ 771 Commercial real estate 1 626 1 302 11 2,839 Construction real estate: SEPH commercial land and development — — — — — — Remaining commercial — — — — — — Mortgage — — — — — — Installment — — — — 1 10 Residential real estate: Commercial 3 1,005 1 3 4 1,683 Mortgage 12 682 14 810 26 1,533 HELOC 1 5 2 160 — — Installment 2 101 2 12 5 72 Consumer 47 434 62 516 74 471 Leases — — — — — — Total loans 67 $ 2,854 $ 86 $ 2,009 132 $ 7,379 Of the $2.9 million in modified TDRs which defaulted during the year ended December 31, 2015 , $44,000 were accruing loans and $2.8 million were nonaccrual loans. Of the $2.0 million in modified TDRs which defaulted during the year ended December 31, 2014 , $314,000 were accruing loans and $1.7 million were nonaccrual loans. Of the $7.4 million in modified TDRs which defaulted during the year ended December 31, 2013, $397,000 were accruing loans and $7.0 million were nonaccrual loans. Certain of the Corporation’s executive officers, directors and related entities of directors are loan customers of PNB. As of December 31, 2015 and 2014 , credit exposure aggregating approximately $47.0 million and $45.7 million , respectively, was outstanding to such parties. Of this total exposure, approximately $36.0 million was outstanding at each of December 31, 2015 and 2014 , with the remaining balance representing available credit. During 2015 , new loans and advances on existing loans were made to these executive officers, directors and related entities totaling $5.8 million and $7.1 million , respectively. These extensions of credit were offset by payments of $12.9 million . During 2014 , new loans and advances on existing loans were $6.0 million and $6.4 million , respectively. These extensions of credit were offset by payments of $14.1 million .

Allowance for Loan Losses

Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2015
Allowance For Loan Losses [Abstract]
Allowance for Loan Losses	Allowance for Loan Losses The allowance for loan losses is that amount management believes is adequate to absorb probable incurred credit losses in the loan portfolio based on management’s evaluation of various factors including overall growth in the loan portfolio, an analysis of individual loans, prior and current loss experience, and current economic conditions. A provision for loan losses is charged to operations based on management’s periodic evaluation of these and other pertinent factors as discussed within Note 1 - Summary of Significant Accounting Policies . Management updates historical losses annually in the fourth quarter, or more frequently as deemed appropriate. With the inclusion of 2013 net charge-off information, management concluded that it was no longer appropriate to calculate the historical loss average with an even allocation across the five-year period. Rather than apply a 20% allocation to each year in the calculation of the historical annualized loss factor, management determined that it was appropriate to more heavily weight those years with higher losses in the historical loss calculation, given the continued uncertainty in the current economic environment. Specifically, rather than applying equal percentages to each year in the historical loss calculation, management applied more weight to the 2009 through 2011 periods compared to the 2012 and 2013 periods. Management continued to extend the historical loss period to six years in 2014 and seven years in 2015 . Due to the same factors that management considered in 2013 , management has continued to apply more weight to the 2009 through 2011 periods compared to the 2012 through 2015 periods. The activity in the allowance for loan losses for the years ended December 31, 2015 , 2014 , and 2013 is summarized in the following tables. Year ended December 31, 2015 (In thousands) Commercial, financial and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for credit losses: Beginning balance $ 10,719 $ 8,808 $ 8,652 $ 14,772 $ 11,401 $ — $ 54,352 Charge-offs 2,478 348 470 2,352 8,642 — 14,290 Recoveries (1,373 ) (2,241 ) (2,092 ) (2,438 ) (3,295 ) (3 ) (11,442 ) Net charge-offs (recoveries) 1,105 (1,893 ) (1,622 ) (86 ) 5,347 (3 ) 2,848 Provision (Recovery) $ 4,080 $ (1,504 ) $ (1,710 ) $ (1,344 ) $ 5,470 $ (2 ) $ 4,990 Ending balance $ 13,694 $ 9,197 $ 8,564 $ 13,514 $ 11,524 1 $ 56,494 Year ended December 31, 2014 (In thousands) Commercial, financial and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for credit losses: Beginning balance $ 14,218 $ 15,899 $ 6,855 $ 14,251 $ 8,245 $ — $ 59,468 Charge-offs 3,779 8,003 1,316 3,944 7,738 — 24,780 Recoveries (1,003 ) (7,759 ) (12,572 ) (2,985 ) (2,671 ) (7 ) (26,997 ) Net charge-offs (recoveries) 2,776 244 (11,256 ) 959 5,067 (7 ) (2,217 ) (Recovery) Provision (723 ) (6,847 ) (9,459 ) 1,480 8,223 (7 ) (7,333 ) Ending balance $ 10,719 $ 8,808 $ 8,652 $ 14,772 $ 11,401 — $ 54,352 Year ended December 31, 2013 (In thousands) Commercial, financial and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for credit losses: Beginning balance $ 15,635 $ 11,736 $ 6,841 $ 14,759 $ 6,566 $ — $ 55,537 Charge-offs 6,160 1,832 1,791 3,207 6,163 — 19,153 Recoveries (1,314 ) (726 ) (9,378 ) (6,000 ) (2,249 ) (2 ) (19,669 ) Net charge-offs (recoveries) 4,846 1,106 (7,587 ) (2,793 ) 3,914 (2 ) (516 ) Provision (Recovery) 3,429 5,269 (7,573 ) (3,301 ) 5,593 (2 ) 3,415 Ending balance $ 14,218 $ 15,899 $ 6,855 $ 14,251 $ 8,245 — $ 59,468 Loans collectively evaluated for impairment in the following tables include all performing loans at December 31, 2015 and 2014 , as well as nonperforming loans internally classified as consumer loans. Nonperforming consumer loans are not typically individually evaluated for impairment, but receive a portion of the statistical allocation of the allowance for loan losses. Loans individually evaluated for impairment include all impaired loans internally classified as commercial loans at December 31, 2015 and 2014 , which are evaluated for impairment in accordance with GAAP (see Note 1 - Summary of Significant Accounting Policies). The composition of the allowance for loan losses at December 31, 2015 and 2014 was as follows: December 31, 2015 (In thousands) Commercial, financial, and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for loan losses: Ending allowance balance attributed to loans Individually evaluated for impairment $ 1,904 $ 381 $ 1,356 $ 550 $ — $ — $ 4,191 Collectively evaluated for impairment 11,790 8,816 7,208 12,964 11,524 1 52,303 Total ending allowance balance $ 13,694 $ 9,197 $ 8,564 $ 13,514 $ 11,524 $ 1 $ 56,494 Loan Balance: Loans individually evaluated for impairment $ 30,545 $ 18,015 $ 6,716 $ 25,323 $ — $ — $ 80,599 Loans collectively evaluated for impairment 925,182 1,095,588 166,629 1,830,120 967,111 2,856 4,987,486 Total ending loan balance $ 955,727 $ 1,113,603 $ 173,345 $ 1,855,443 $ 967,111 $ 2,856 $ 5,068,085 Allowance for loan losses as a percentage of loan balance: Loans individually evaluated for impairment 6.23 % 2.11 % 20.19 % 2.17 % — % — % 5.20 % Loans collectively evaluated for impairment 1.27 % 0.80 % 4.33 % 0.71 % 1.19 % 0.04 % 1.05 % Total 1.43 % 0.83 % 4.94 % 0.73 % 1.19 % 0.04 % 1.11 % Recorded Investment: Loans individually evaluated for impairment $ 30,595 $ 18,025 $ 6,720 $ 25,324 $ — $ — $ 80,664 Loans collectively evaluated for impairment 928,569 1,099,587 167,042 1,833,449 970,143 2,870 5,001,660 Total ending recorded investment $ 959,164 $ 1,117,612 $ 173,762 $ 1,858,773 $ 970,143 $ 2,870 $ 5,082,324 December 31, 2014 (In thousands) Commercial, financial, and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for loan losses: Ending allowance balance attributed to loans Individually evaluated for impairment $ 981 $ 262 $ 1,812 $ 605 $ — $ — $ 3,660 Collectively evaluated for impairment 9,738 8,546 6,840 14,167 11,401 — 50,692 Total ending allowance balance $ 10,719 $ 8,808 $ 8,652 $ 14,772 $ 11,401 $ — $ 54,352 Loan Balance: Loans individually evaluated for impairment $ 19,103 $ 21,978 $ 7,690 $ 24,905 $ — $ — $ 73,676 Loans collectively evaluated for impairment 837,432 1,047,659 148,114 1,826,470 893,160 3,171 4,756,006 Total ending loan balance $ 856,535 $ 1,069,637 $ 155,804 $ 1,851,375 $ 893,160 $ 3,171 $ 4,829,682 Allowance for loan losses as a percentage of loan balance: Loans individually evaluated for impairment 5.14 % 1.19 % 23.56 % 2.43 % — % — % 4.97 % Loans collectively evaluated for impairment 1.16 % 0.82 % 4.62 % 0.78 % 1.28 % — % 1.07 % Total 1.25 % 0.82 % 5.55 % 0.80 % 1.28 % — % 1.13 % Recorded Investment: Loans individually evaluated for impairment $ 19,106 $ 21,989 $ 7,687 $ 24,930 $ — $ — $ 73,712 Loans collectively evaluated for impairment 840,647 1,051,194 148,512 1,829,931 896,127 3,188 4,769,599 Total ending recorded investment $ 859,753 $ 1,073,183 $ 156,199 $ 1,854,861 $ 896,127 $ 3,188 $ 4,843,311

Loans Held for Sale (Notes)

Loans Held for Sale (Notes)	12 Months Ended
	Dec. 31, 2015
Loans Held for Sale [Abstract]
Loans Held for Sale [Table Text Block]	Loans Held for Sale Mortgage loans held for sale are carried at their fair value. Mortgage loans held for sale were $7.3 million and $5.3 million at December 31, 2015 and 2014 , respectively. These amounts are included in loans on the Consolidated Balance Sheets and in the residential real estate loan segments in Note 6 - Loans and Note 7 - Allowance for Loan Losses . The contractual balance was $7.2 million and $5.2 million at December 31, 2015 and 2014 , respectively. The gain expected upon sale was $95,000 and $80,000 at December 31, 2015 and 2014 , respectively. None of these loans were 90 days or more past due or on nonaccrual status as of December 31, 2015 or 2014 . During 2015, Park transferred to held for sale and sold certain commercial loans previously held for investment with a book balance of $144,000 , and recognized a gain of $756,000 . During 2014, Park transferred certain commercial loans held for investment, with a book balance of $22.0 million , to the loans held for sale portfolio, and subsequently completed the sale of these commercial loans held for sale, recognizing a net gain on sale of $1.9 million .

Other Real Estate Owned (Notes)

Other Real Estate Owned (Notes)	12 Months Ended
	Dec. 31, 2015
Schedule of Assets Repossessed or Foreclosed, or loans in process of foreclosure [Line Items]
Real Estate Owned [Text Block]	Other Real Estate Owned The carrying amount of foreclosed properties held at December 31, 2015 and December 31, 2014 are listed below, as well as the recorded investment of loans secured by residential real estate properties for which formal foreclosure proceedings were in process at those dates. (In thousands) December 31, 2015 December 31, 2014 OREO: Commercial real estate $ 8,333 $ 6,352 Construction real estate 7,259 11,281 Residential real estate 3,059 4,972 Total OREO $ 18,651 $ 22,605 Loans in process of foreclosure: Residential real estate $ 2,021 $ 2,807

Premises And Equipment

Premises And Equipment	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and Equipment The major categories of premises and equipment and accumulated depreciation are summarized as follows: December 31 (In thousands) 2015 2014 Land $ 19,123 $ 17,836 Buildings 74,525 71,002 Equipment, furniture and fixtures 47,839 42,139 Leasehold improvements 3,878 3,439 Total $ 145,365 $ 134,416 Less accumulated depreciation (85,872 ) (78,937 ) Premises and equipment, net $ 59,493 $ 55,479 Depreciation expense amounted to $7.3 million , $7.2 million and $7.3 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. The Corporation leases certain premises and equipment accounted for as operating leases. The following is a schedule of the future minimum rental payments required for the next five years under such leases with initial terms in excess of one year: (In thousands) 2016 $ 1,475 2017 1,276 2018 1,104 2019 1,019 2020 394 Thereafter 520 Total $ 5,788 Rent expense for Park was $1.7 million , $1.7 million and $1.8 million , for the years ended December 31, 2015 , 2014 and 2013 , respectively.

Investment in Qualified Afforda

Investment in Qualified Affordable Housing	12 Months Ended
	Dec. 31, 2015
Investments in Qualified Affordable Housing [Abstract]
Equity Method Investments and Joint Ventures Disclosure [Text Block]	Investment in Qualified Affordable Housing Park makes certain equity investments in various limited partnerships that sponsor affordable housing projects. The purpose of these investments is to achieve a satisfactory return on capital, help create affordable housing opportunities, and assist the Company to achieve our goals associated with the Community Reinvestment Act. Previously, these investments were accounted for under the cost method of accounting with amortization of the investment being recorded in other expense and tax benefits recognized in the provision for income taxes. During the first quarter of 2015 , Park adopted ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects , and elected the proportional amortization method with amortization expense and tax benefits recognized through the provision for income taxes. This ASU is required to be applied retrospectively to all periods presented. As a result of these changes, Park recorded a cumulative-effect adjustment to beginning retained earnings. The following table summarizes the impact of retrospective application to the balance sheet and income statement for all prior periods presented: (In thousands) December 31, 2014 Total assets As previously reported $ 7,003,256 As reported under the new guidance 7,001,199 Retained earnings As previously reported $ 486,541 As reported under the new guidance 484,484 Total equity As previously reported $ 698,598 As reported under the new guidance 696,541 (In thousands) 12 months ended December 31, 2014 12 months ended December 31, 2013 Total other expense As previously reported $ 195,234 $ 188,529 As reported under the new guidance 187,510 181,515 Income tax expense As previously reported $ 28,602 $ 25,131 As reported under the new guidance 36,459 32,503 Net income As previously reported $ 84,090 $ 77,227 As reported under the new guidance 83,957 76,869 The table below details the balances of Park’s affordable housing tax credit investments and related unfunded commitments as of December 31, 2015 and 2014. (In thousands) December 31, 2015 December 31, 2014 Affordable housing tax credit investments $ 51,247 $ 48,911 Unfunded commitments 20,311 16,629 During the years ended December 31, 2015 and 2014, Park recognized amortization expense of $ 6.7 million and $6.9 million , respectively, which was included within the provision for income taxes. For the years ended December 31, 2015 and 2014, Park recognized tax credits and other benefits from its affordable housing tax credit investments of $8.9 million and $8.8 million , respectively.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2015
Deposits [Abstract]
Deposits	Deposits At December 31, 2015 and 2014 , non-interest bearing and interest bearing deposits were as follows: December 31 (In thousands) 2015 2014 Non-interest bearing $ 1,404,032 $ 1,269,296 Interest bearing 3,943,610 3,858,704 Total $ 5,347,642 $ 5,128,000 At December 31, 2015 , the maturities of time deposits were as follows: (In thousands) 2016 $ 814,387 2017 221,761 2018 56,744 2019 145,027 2020 52,062 After 5 years 431 Total $ 1,290,412 At December 31, 2015 and 2014, respectively, Park had approximately $21.6 million and $21.9 million of deposits received from executive officers, directors and their related entities. Time deposits that exceed the FDIC Insurance limit of $250,000 at December 31, 2015 and 2014 were $49.7 million and $64.7 million , respectively.

Repurchase Agreements (Notes)

Repurchase Agreements (Notes)	12 Months Ended
	Dec. 31, 2015
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Table Text Block]	Repurchase Agreement Borrowings Securities sold under agreements to repurchase ("repurchase agreements") with customers represent funds deposited by customers, generally on an overnight basis, that are collateralized by investment securities owned by Park. Repurchase agreements with customers are included in short-term borrowings on the consolidated balance sheets. Park's repurchase agreements with a third-party financial institution are classified as long-term debt on the Consolidated Balance Sheets. All repurchase agreements are subject to terms and conditions of repurchase/security agreements between Park and the client and are accounted for as secured borrowings. Park's repurchase agreements reflected in short-term borrowings consist of customer accounts and securities which are pledged on an individual security basis. At December 31, 2015 and December 31, 2014 , Park's repurchase agreement borrowings totaled $554 million and $577 million , respectively. At both December 31, 2015 and December 31, 2014 , $300 million of Park's repurchase agreement borrowings were classified as long-term debt with the remaining amount being classified as short-term debt on the Consolidated Balance Sheets. These borrowings were collateralized with U.S. government and agency securities with a carrying value of $622 million and $664 million at December 31, 2015 and December 31, 2014 , respectively. Declines in the value of the collateral would require Park to pledge additional securities. As of December 31, 2015 and December 31, 2014 , Park had $585 million and $347 million , respectively, of available unpledged securities. The following table presents the carrying value of Park's repurchase agreements by remaining contractual maturity at December 31, 2015 and December 31, 2014 : December 31, 2015 (In thousands) Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 days 30 - 90 days Greater than 90 days Total U.S. government and agency securities $ 247,618 $ 2,239 $ — $ 304,385 $ 554,242 December 31, 2014 (In thousands) Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 days 30 - 90 days Greater than 90 days Total U.S. government and agency securities $ 268,427 $ 164 $ 4,940 $ 303,449 $ 576,980 See Note 14 - Short-Term Borrowings for additional information related to repurchase agreements classified as short-term borrowings. See Note 15 - Long-Term Debt for additional information related to repurchase agreements classified as long-term debt.

Short-Term Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2015
Short-term Debt [Abstract]
Short-Term Borrowings	Short-Term Borrowings Short-term borrowings were as follows: December 31 (In thousands) 2015 2014 Securities sold under agreements to repurchase $ 254,242 $ 276,980 FHLB advances 140,000 — Total short-term borrowings $ 394,242 $ 276,980 The outstanding balances for all short-term borrowings as of December 31, 2015 and 2014 and the weighted-average interest rates as of and paid during each of the years then ended were as follows: (In thousands) Repurchase agreements FHLB Advances 2015 Ending balance $ 254,242 $ 140,000 Highest month-end balance 278,324 140,000 Average daily balance 257,622 1,096 Weighted-average interest rate: As of year-end 0.17 % 0.56 % Paid during the year 0.18 % 0.59 % 2014 Ending balance $ 276,980 $ — Highest month-end balance 307,025 — Average daily balance 262,709 561 Weighted-average interest rate: As of year-end 0.18 % — % Paid during the year 0.19 % 0.10 % During 2014 and 2015 , outstanding FHLB advances were collateralized by investment securities owned by the Corporation’s bank subsidiary and by various loans pledged under a blanket agreement by the Corporation’s bank subsidiary. At December 31, 2015 and 2014, $21 million and $28 million , respectively, of investment securities were pledged as collateral for FHLB advances. At December 31, 2015 and 2014 , $1,985 million and $2,038 million , respectively, of commercial real estate and residential mortgage loans were pledged under a blanket agreement to the FHLB by Park’s bank subsidiary. See Note 13 - Repurchase Agreement Borrowings for information related to investment securities collateralizing repurchase agreements.

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt is listed below: December 31, 2015 2014 (In thousands) Outstanding Balance Average Rate Outstanding Balance Average Rate Total Federal Home Loan Bank advances by year of maturity: 2015 — — % 51,000 2.00 % 2016 — — % 26,000 0.92 % 2017 50,000 1.25 % 51,000 1.28 % 2018 150,000 2.04 % 125,049 2.11 % 2019 75,000 1.96 % 75,333 1.97 % 2020 25,000 2.14 % 25,462 2.19 % Thereafter 150,000 3.32 % 150,699 3.33 % Total $ 450,000 2.37 % 504,543 2.30 % Total broker repurchase agreements by year of maturity: 2017 300,000 1.75 % 300,000 1.75 % Total $ 300,000 1.75 % $ 300,000 1.75 % Total combined long-term debt by year of maturity: 2015 — — % 51,000 2.00 % 2016 — — % 26,000 0.92 % 2017 350,000 1.68 % 351,000 1.68 % 2018 150,000 2.04 % 125,049 2.11 % 2019 75,000 1.96 % 75,333 1.97 % 2020 25,000 2.14 % 25,462 2.19 % Thereafter 150,000 3.32 % 150,699 3.33 % Total $ 750,000 2.12 % $ 804,543 2.09 % Prepayment penalty (11,895 ) — (17,941 ) — Total long-term debt $ 738,105 2.16 % $ 786,602 2.89 % On November 30, 2012, Park restructured $300 million in repurchase agreements at a rate of 1.75% . As part of this restructuring, Park paid a prepayment penalty of $25 million . The penalty is being amortized as an adjustment to interest expense over the remaining term of the repurchase agreements using the effective interest method, resulting in an effective interest rate of 3.55% . Of the $25 million prepayment penalty, $9.8 million remained to be amortized as of December 31, 2015 . The remaining amortization will be $5.1 million in 2016 and $4.7 million in 2017. On November 21, 2014, Park restructured $50 million in FHLB advances at a rate of 1.25% . As part of this restructuring, Park paid a prepayment penalty of $3.2 million . The penalty is being amortized as an adjustment to interest expense over the remaining term of the advances using the effective interest method, resulting in an effective interest rate of 3.52% . Of the $3.2 million prepayment penalty, $2.1 million remained to be amortized as of December 31, 2015 . The remaining amortization will be $1.1 million in 2016 and $1.0 million in 2017. On March 30, 2015, Park prepaid $54.5 million of FHLB advances, with a weighted average rate of 1.59% , resulting in a prepayment penalty of $532,000 . Park had approximately $150.0 million of long-term debt at December 31, 2015 with a contractual maturity longer than five years. However, all of this debt is callable by the issuer in 2016. At December 31, 2015 and 2014 , FHLB advances were collateralized by investment securities owned by PNB’s banking divisions and by various loans pledged under a blanket agreement by PNB's banking divisions. At December 31, 2015 and 2014, $21 million and $28 million , respectively, of investment securities were pledged as collateral for FHLB advances. At December 31, 2015 and 2014, $1,985 million and $2,038 million , respectively, of commercial real estate and residential mortgage loans were pledged under a blanket agreement to the FHLB by Park's bank subsidiary. See Note 13 - Repurchase Agreement Borrowings for information related to investment securities collateralizing repurchase agreements.

Subordinated Debentures_Notes

Subordinated Debentures/Notes	12 Months Ended
	Dec. 31, 2015
Long-term Debt, Unclassified [Abstract]
Subordinated Debentures/Notes	Subordinated Notes As part of the acquisition of Vision's parent bank holding company ("Vision Parent") on March 9, 2007, Park became the successor to Vision Parent under (i) the Amended and Restated Trust Agreement of Vision Bancshares Trust I (the “Trust”), dated as of December 5, 2005, (ii) the Junior Subordinated Indenture, dated as of December 5, 2005, and (iii) the Guarantee Agreement, also dated as of December 5, 2005. On December 1, 2005, Vision Parent formed a wholly-owned Delaware statutory business trust, Vision Bancshares Trust I (“Trust I”), which issued $15.0 million of Trust I's floating rate preferred securities (the “Trust Preferred Securities”) to institutional investors. These Trust Preferred Securities qualify as Tier I capital under FRB guidelines. All of the common securities of Trust I are owned by Park. The proceeds from the issuance of the common securities and the Trust Preferred Securities were used by Trust I to purchase $15.5 million of junior subordinated notes, which carry a floating rate based on three-month LIBOR plus 148 basis points. The debentures represent the sole asset of Trust I. The Trust Preferred Securities accrue and pay distributions at a floating rate of three-month LIBOR plus 148 basis points per annum. The Trust Preferred Securities are mandatorily redeemable upon maturity of the notes in December 2035, or upon earlier redemption as provided in the notes. Park has the right to redeem the notes purchased by Trust I in whole or in part, on or after December 30, 2010. As specified in the indenture, if the notes are redeemed prior to maturity, the redemption price will be the principal amount, plus any unpaid accrued interest. In accordance with GAAP, Trust I is not consolidated with Park’s financial statements, but rather the subordinated notes are reflected as a liability. On December 23, 2009, Park entered into a Note Purchase Agreement, dated December 23, 2009, with 38 purchasers (the “2009 Purchasers”). Under the terms of the Note Purchase Agreement, the 2009 Purchasers purchased from Park an aggregate principal amount of $35.25 million of 10% Subordinated Notes due December 23, 2019 (the “2009 Notes”). The 2009 Notes were intended to qualify as Tier 2 capital under applicable rules and regulations of the FRB. The 2009 Notes could not be prepaid in any amount prior to December 23, 2014; however, subsequent to that date, Park could prepay, without penalty, all or a portion of the principal amount outstanding. Of the $35.25 million in 2009 Notes, $14.05 million were purchased by related parties. The 2009 Notes were prepaid in full on December 24, 2014, together with accrued interest. On April 20, 2012, Park entered into a Note Purchase Agreement, dated April 20, 2012 (the “2012 Purchase Agreement”), with 56 purchasers (the "2012 Purchasers"). Under the terms of the 2012 Purchase Agreement, the 2012 Purchasers purchased from Park an aggregate principal amount of $30 million of 7% Subordinated Notes due April 20, 2022 (the "2012 Notes"). The 2012 Notes are intended to qualify as Tier 2 capital under applicable rules and regulations of the FRB. Each 2012 Note was purchased at a purchase price of 100% of the principal amount thereof. The 2012 Notes may not be prepaid by Park prior to April 20, 2017. From and after April 20, 2017, Park may prepay all, or from time to time, any part of the 2012 Notes at 100% of the principal amount (plus accrued interest) without penalty, subject to any requirement under FRB regulations to obtain prior approval from the FRB before making any prepayment.

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Option Plan	Share-Based Compensation The Park National Corporation 2013 Long-Term Incentive Plan (the "2013 Incentive Plan") was adopted by the Board of Directors of Park on January 28, 2013 and was approved by Park's shareholders at the Annual Meeting of Shareholders on April 22, 2013. The 2013 Incentive Plan makes equity-based awards and cash-based awards available for grant to participants in the form of incentive stock options, nonqualified stock options, stock appreciation rights, restricted common shares, restricted stock unit awards that may be settled in common shares, cash or a combination of the two, unrestricted common shares and cash-based awards. Under the 2013 Incentive Plan, 600,000 common shares are authorized to be issued and delivered in connection with grants under the 2013 Incentive Plan. The common shares to be issued and delivered under the 2013 Incentive Plan may consist of either common shares currently held or common shares subsequently acquired by Park as treasury shares, including common shares purchased in the open market or in private transactions. No awards may be made under the 2013 Incentive Plan after April 22, 2023. At December 31, 2015, 524,100 common shares were available for future grants under the 2013 Incentive Plan. During 2015, 2014, and 2013, Park granted 10,150 , 10,200 , and 10,550 common shares, respectively, to directors of Park and to directors of Park's bank subsidiary PNB (and its divisions) under the 2013 Incentive Plan. The common shares granted to directors were not subjected to a vesting period and resulted in expense of $963,000 , $801,000 , and $850,000 in 2015, 2014, and 2013, respectively, which is included in Professional fees and services on the Consolidated Income Statement. On January 24, 2014, the Compensation Committee of the Board of Directors of Park granted awards of an aggregate of 21,975 performance-based restricted stock units (“PBRSUs”) to certain employees of Park, which grants were effective on January 24, 2014. On December 16, 2014, the Compensation Committee of the Board of Directors of Park granted awards of an aggregate of 23,025 PBRSUs to certain employees of Park, which grants were effective on January 2, 2015. The number of PBRSUs earned or settled will depend on certain performance conditions and are also subject to service-based vesting. None of the PBRSUs have vested as of December 31, 2015. As of December 31, 2015, 200 PBRSUs have been forfeited. Share-based compensation expense of $865,000 and $458,000 was recognized for the years ended December 31, 2015 and 2014, respectively, related to PBRSU awards to employees. Park expects to recognize additional share-based compensation expense of approximately $734,000 through the first quarter of 2018 related to PBRSUs granted in 2014 and approximately $1.2 million through the first quarter of 2019 related to PBRSUs granted in 2015. No share-based compensation expense was recognized in 2013 as there were no outstanding awards held by employees.

Benefit Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Benefit Plans	Benefit Plans The Corporation has a noncontributory Defined Benefit Pension Plan (the “Pension Plan”) covering substantially all of the employees of the Corporation and its subsidiaries. The Pension Plan provides benefits based on an employee’s years of service and compensation. There were no pension contributions in 2014 or 2015 and there is no contribution expected in 2016. Using an accrual measurement date of December 31, 2015 and 2014 , plan assets and benefit obligation activity for the Pension Plan are listed below: (In thousands) 2015 2014 Change in fair value of plan assets Fair value at beginning of measurement period $ 160,598 $ 152,739 Actual return on plan assets (58 ) 15,511 Benefits paid (7,042 ) (7,652 ) Fair value at end of measurement period $ 153,498 $ 160,598 Change in benefit obligation Projected benefit obligation at beginning of measurement period $ 109,328 $ 89,179 Service cost 5,368 4,331 Interest cost 4,695 4,577 Actuarial (gains) loss (10,104 ) 18,893 Benefits paid (7,042 ) (7,652 ) Projected benefit obligation at the end of measurement period $ 102,245 $ 109,328 Funded status at end of year (fair value of plan assets less benefit obligation) $ 51,253 $ 51,270 The asset allocation for the Pension Plan as of each measurement date, by asset category, was as follows: Percentage of Plan Assets Asset category Target Allocation 2015 2014 Equity securities 50% - 100% 85 % 85 % Fixed income and cash equivalents remaining balance 15 % 15 % Total 100 % 100 % The investment policy, as established by the Retirement Plan Committee, is to invest assets according to the target allocation stated above. Assets will be reallocated periodically based on the investment strategy of the Retirement Plan Committee. The investment policy is reviewed periodically. The expected long-term rate of return on plan assets used to measure the benefit obligation was 7.25% as of December 31, 2015 and 2014. This return was based on the expected return of each of the asset categories, weighted based on the median of the target allocation for each class. The accumulated benefit obligation for the Pension Plan was $86.1 million and $92.0 million at December 31, 2015 and 2014 , respectively. On November 17, 2009, the Park Pension Plan completed the purchase of 115,800 common shares of Park for $7.0 million or $60.45 per share. At December 31, 2015 and 2014 , the fair value of the 115,800 common shares held by the Pension Plan was $10.5 million , or $90.48 per share and $10.2 million , or $88.48 per share, respectively. The weighted average assumptions used to determine benefit obligations at December 31, 2015 , 2014 and 2013 were as follows: 2015 2014 2013 Discount rate 4.88 % 4.42 % 5.30 % Rate of compensation increase Under age 30 10.00 % 10.00 % 10.00 % Ages 30-39 6.00 % 6.00 % 6.00 % Ages 40 and over 3.00 % 3.00 % 3.00 % The estimated future pension benefit payments reflecting expected future service for the next ten years are shown below (in thousands): 2016 $ 5,010 2017 5,321 2018 5,800 2019 6,780 2020 7,317 2021-2025 45,831 Total $ 76,059 The following table shows ending balances of accumulated other comprehensive loss at December 31, 2015 and 2014. (In thousands) 2015 2014 Prior service cost $ — $ (15 ) Net actuarial loss (23,618 ) (22,855 ) Total (23,618 ) (22,870 ) Deferred taxes 8,267 8,005 Accumulated other comprehensive loss $ (15,351 ) $ (14,865 ) Using an actuarial measurement date of December 31 for 2015 , 2014 and 2013 , components of net periodic benefit cost and other amounts recognized in other comprehensive (loss) income were as follows: (In thousands) 2015 2014 2013 Components of net periodic benefit cost and other amounts recognized in other comprehensive (loss) income Service cost $ (5,368 ) $ (4,331 ) $ (4,817 ) Interest cost (4,695 ) (4,577 ) (4,223 ) Expected return on plan assets 11,420 10,869 9,536 Amortization of prior service cost (15 ) (19 ) (20 ) Recognized net actuarial loss (637 ) — (2,703 ) Net periodic benefit income (cost) $ 705 $ 1,942 $ (2,227 ) Change to net actuarial (loss) gain for the period $ (1,400 ) $ (14,276 ) $ 30,409 Amortization of prior service cost 15 19 20 Amortization of net loss 637 — 2,703 Total recognized in other comprehensive (loss) income (748 ) (14,257 ) 33,132 Total recognized in net benefit cost and other comprehensive (loss) income $ (43 ) $ (12,315 ) $ 30,905 There are no estimated prior service costs for the Pension Plan to be amortized from accumulated other comprehensive loss into net periodic benefit cost over the next fiscal year. The estimated net actuarial loss expected to be recognized in the next fiscal year is $773,000 . The weighted average assumptions used to determine net periodic benefit cost for the years ended December 31, 2015 , 2014 and 2013 are listed below: 2015 2014 2013 Discount Rate 4.42 % 5.30 % 4.47 % Rate of compensation increase Under age 30 10.00 % 10.00 % 10.00 % Ages 30-39 6.00 % 6.00 % 6.00 % Ages 40 and over 3.00 % 3.00 % 3.00 % Expected long-term return on plan assets 7.25 % 7.25 % 7.50 % The Pension Plan maintains cash in a PNB savings account. The Pension Plan cash balance was $0.7 million at December 31, 2015 . GAAP defines fair value as the price that would be received by Park for an asset or paid by Park to transfer a liability (an exit price) in an orderly transaction between market participants on the measurement date, using the most advantageous market for the asset or liability. The fair values of equity securities, consisting of mutual fund investments and common stock (U.S. large cap) held by the Pension Plan and the fixed income and cash equivalents, are determined by obtaining quoted prices on nationally recognized securities exchanges (Level 1 inputs). The fair value of Pension Plan assets at December 31, 2015 was $153.5 million . At December 31, 2015 , $135.0 million of equity investments and cash in the Pension Plan were categorized as Level 1 inputs; $18.5 million of plan investments in corporate (U.S. large cap) and U.S. Government sponsored entity bonds were categorized as Level 2 inputs, as fair value was based on quoted market prices of comparable instruments; and no investments were categorized as Level 3 inputs. The fair value of Pension Plan assets was $160.6 million at December 31, 2014 . At December 31, 2014 , $141.1 million of investments in the Pension Plan were categorized as Level 1 inputs; $19.5 million were categorized as Level 2; and no investments were categorized as Level 3. The Corporation has a voluntary salary deferral plan covering substantially all of the employees of the Corporation and its subsidiaries. Eligible employees may contribute a portion of their compensation subject to a maximum statutory limitation. The Corporation provides a matching contribution established annually by the Corporation. Contribution expense for the Corporation was $1.2 million , $1.1 million , and $1.1 million for 2015 , 2014 and 2013 , respectively. The Corporation has entered into Supplemental Executive Retirement Benefits Agreements (the "SERP Agreements") with certain key officers of the Corporation and its subsidiaries which provide defined pension benefits in excess of limits imposed by federal tax law. The accrued benefit cost for the SERP Agreements totaled $8.0 million and $7.6 million for 2015 and 2014 , respectively. The expense for the Corporation was $1.1 million for 2015 , $1.5 million for 2014 and $28,000 for 2013 .

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of the Corporation’s deferred tax assets and liabilities are as follows: December 31 (In thousands) 2015 2014 Deferred tax assets: Allowance for loan losses $ 19,773 $ 19,023 Accumulated other comprehensive loss – Pension Plan 8,266 8,005 Accumulated other comprehensive loss – Unrealized losses on securities 157 — Deferred compensation 3,908 3,820 OREO valuation adjustments 2,418 3,984 Net deferred loan fees 1,204 933 Deferred contract bonus 1,031 — Other 4,171 4,338 Total deferred tax assets $ 40,928 $ 40,103 Deferred tax liabilities: Accumulated other comprehensive income – Unrealized gains on securities — 677 Deferred investment income 10,199 10,199 Pension plan 26,205 25,949 Mortgage servicing rights 3,153 3,015 Partnership adjustments 560 865 Other 872 804 Total deferred tax liabilities $ 40,989 $ 41,509 Net deferred tax asset (liability) $ (61 ) $ (1,406 ) Park performs an analysis to determine if a valuation allowance against deferred tax assets is required in accordance with GAAP. Management has determined that it is not required to establish a valuation allowance against the December 31, 2015 or 2014 deferred tax assets in accordance with GAAP since it is more likely than not that the deferred tax assets will be fully utilized in future periods. The components of the provision for federal income taxes are shown below: December 31, (In thousands) 2015 2014 2013 Currently payable Federal $ 32,817 $ 33,931 $ 34,435 Deferred Federal (250 ) 2,528 (1,932 ) Total $ 32,567 $ 36,459 $ 32,503 The following is a reconciliation of income tax expense to the amount computed at the statutory rate of 35% for the years ended December 31, 2015 , 2014 and 2013 . 2015 2014 2013 Statutory federal corporate tax rate 35.0 % 35.0 % 35.0 % Changes in rates resulting from: Tax exempt interest income, net of disallowed interest (0.5 )% (0.5 )% (0.8 )% Bank owned life insurance (1.8 )% (1.4 )% (1.6 )% Investments in qualified affordable housing projects, net of tax benefits (1.9 )% (1.6 )% (1.7 )% Other tax credits (0.9 )% — % — % KSOP dividend deduction (1.0 )% (1.0 )% (1.1 )% Other (0.2 )% (0.2 )% (0.1 )% Effective tax rate 28.7 % 30.3 % 29.7 % Park and its subsidiaries do not pay state income tax to the state of Ohio, but pay a franchise tax based on equity. The franchise tax expense is included in the state tax expense and is shown in “State taxes” on Park’s Consolidated Statements of Income. Unrecognized Tax Benefits The following is a reconciliation of the beginning and ending amount of unrecognized tax benefits. (In thousands) 2015 2014 2013 January 1 Balance $ 532 $ 518 $ 517 Additions based on tax positions related to the current year 80 76 74 Additions for tax positions of prior years 16 14 4 Reductions for tax positions of prior years — — — Reductions due to statute of limitations (70 ) (76 ) (77 ) December 31 Balance $ 558 $ 532 $ 518 The amount of unrecognized tax benefits that, if recognized, would favorably affect the effective income tax rate in the future periods at December 31, 2015 , 2014 and 2013 was $432,000 , $413,000 and $403,000 , respectively. Park does not expect the total amount of unrecognized tax benefits to significantly increase or decrease during the next year. The (income)/expense related to interest and penalties recorded on unrecognized tax benefits in the Consolidated Statements of Income for the years ended December 31, 2015 and 2013 was $2,000 and $(500) , respectively. There was no expense related to interest and penalties for the year ending 2014 . The amount accrued for interest and penalties at December 31, 2015 , 2014 and 2013 was $69,000 , $67,000 and $67,000 , respectively. Park and its subsidiaries are subject to U.S. federal income tax and income tax in various state jurisdictions. The Corporation is subject to routine audits of tax returns by the Internal Revenue Service and states in which we conduct business. No material adjustments have been made on closed federal and state tax audits. All tax years ending prior to December 31, 2012 are closed to examination by the federal and state taxing authorities.

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2015
Other Comprehensive Income (Loss) [Abstract]
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss) Other comprehensive income (loss) components, net of tax, are shown in the following table for the years ended December 31, 2015 , 2014 and 2013 . Year ended December 31, (in thousands) Changes in Pension Plan assets and benefit obligations Unrealized gains and losses on available-for-sale securities Total Beginning balance at December 31, 2014 $ (14,865 ) $ 1,257 $ (13,608 ) Other comprehensive (loss) before reclassifications (910 ) (1,549 ) (2,459 ) Amounts reclassified from accumulated other comprehensive loss 424 — 424 Net current period other comprehensive loss (486 ) (1,549 ) (2,035 ) Ending balance at December 31, 2015 $ (15,351 ) $ (292 ) $ (15,643 ) Beginning balance at December 31, 2013 $ (5,598 ) $ (29,821 ) $ (35,419 ) Other comprehensive (loss) gain before reclassifications (9,279 ) 30,325 21,046 Amounts reclassified from accumulated other comprehensive loss 12 753 765 Net current period other comprehensive (loss) income (9,267 ) 31,078 21,811 Ending balance at December 31, 2014 $ (14,865 ) $ 1,257 $ (13,608 ) Beginning balance at December 31, 2012 $ (27,134 ) $ 9,616 $ (17,518 ) Other comprehensive gain (loss) before reclassifications 19,766 (39,448 ) (19,682 ) Amounts reclassified from accumulated other comprehensive loss 1,770 11 1,781 Net current period other comprehensive income (loss) 21,536 (39,437 ) (17,901 ) Ending balance at December 31, 2013 $ (5,598 ) $ (29,821 ) $ (35,419 ) The following table provides information concerning amounts reclassified out of accumulated other comprehensive loss for the years ended December 31, 2015, 2014 and 2013: Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Affected Line Item in the Statement of Income (In thousands) 2015 2014 2013 Amortization of defined benefit pension items Amortization of prior service cost $ 15 $ 19 $ 20 Employee benefits Amortization of net loss 637 — 2,703 Employee benefits Total income before income taxes 652 19 2,723 Total income before income taxes Federal income taxes 228 7 953 Federal income taxes Net of tax $ 424 $ 12 $ 1,770 Net of tax Unrealized gains & losses on available for sale securities Loss on sale of investment securities $ — $ 1,158 $ — Gain (loss) on sale of investment securities Other than temporary impairment — — 17 Miscellaneous expense Total income before income taxes — 1,158 17 Total income before income taxes Federal income taxes — 405 6 Federal income taxes Net of tax $ — $ 753 $ 11 Net of tax

Earnings Per Common Share

Earnings Per Common Share	12 Months Ended
	Dec. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share GAAP requires the reporting of basic and diluted earnings per common share. Basic earnings per common share excludes any dilutive effects of restricted stock units. The following table sets forth the computation of basic and diluted earnings per common share: Year ended December 31 2015 2014 2013 Numerator: Net income available to common shareholders $ 81,012 $ 83,957 $ 76,869 Denominator: Basic earnings per common share: Weighted-average common shares outstanding 15,364,281 15,394,971 15,412,365 Effect of dilutive securities – performance based restricted stock units 40,459 18,861 — Diluted earnings per common share: Adjusted weighted-average shares and assumed vesting 15,404,740 15,413,832 15,412,365 Earnings per common share: Basic earnings per common share $ 5.27 $ 5.45 $ 4.99 Diluted earnings per common share $ 5.26 $ 5.45 $ 4.99 Park awarded 23,025 and 21,975 PBRSUs to certain employees during the years ended December 31, 2015 and 2014, respectively. The PBRSUs vest based on service and performance conditions. The dilutive effect of the PBRSUs was the addition of 40,459 and 18,861 common shares for the years ended December 31, 2015 and 2014, respectively. During the years ended December 31, 2015 and 2014, Park repurchased 71,700 and 29,700 common shares, respectively, to fund the PBRSUs and common shares awarded to directors of Park and to directors of Park's subsidiary PNB (and its divisions).

Dividend Restrictions

Dividend Restrictions	12 Months Ended
	Dec. 31, 2015
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Dividend Restrictions	Dividend Restrictions Bank regulators limit the amount of dividends a subsidiary bank can declare in any calendar year without obtaining prior approval. At December 31, 2015 , approximately $107.5 million of the total shareholders’ equity of PNB was available for the payment of dividends to the Corporation, without approval by the applicable regulatory authorities.

Financial Instruments With Off-

Financial Instruments With Off-Balance Sheet Risk And Financial Instruments With Concentrations Of Credit Risk	12 Months Ended
	Dec. 31, 2015
Risks and Uncertainties [Abstract]
Financial Instruments with Off-Balance Sheet Risk and Financial Instruments with Concentration of Credit Risk	Financial Instruments with Off-Balance Sheet Risk and Financial Instruments with Concentrations of Credit Risk The Corporation is party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include loan commitments and standby letters of credit. The instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized in the consolidated financial statements. The Corporation’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for loan commitments and standby letters of credit is represented by the contractual amount of those instruments. The Corporation uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. Since many of the loan commitments may expire without being drawn upon, the total commitment amount does not necessarily represent future cash requirements. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan commitments to customers. The total amounts of off-balance sheet financial instruments with credit risk were as follows: December 31 (In thousands) 2015 2014 Loan commitments $ 888,411 $ 869,793 Standby letters of credit 12,326 12,473 The loan commitments are generally for variable rates of interest. The Corporation grants retail, commercial and commercial real estate loans to customers primarily located in Ohio. The Corporation evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Corporation upon extension of credit, is based on management’s credit evaluation of the customer. Collateral held varies but may include accounts receivable, inventory, property, plant and equipment, and income-producing commercial properties. Although the Corporation has a diversified loan portfolio, a substantial portion of the borrowers’ ability to honor their contracts is dependent upon the economic conditions in each borrower’s geographic location and industry.

Loan Servicing

Loan Servicing	12 Months Ended
	Dec. 31, 2015
Transfers and Servicing of Financial Assets [Abstract]
Loan Servicing	Loan Servicing Park serviced sold mortgage loans of $1,276 million at December 31, 2015 , compared to $1,265 million at December 31, 2014 and $1,326 million at December 31, 2013 . At December 31, 2015 , $5.4 million of the sold mortgage loans were sold with recourse compared to $7.0 million at December 31, 2014 . Management closely monitors the delinquency rates on the mortgage loans sold with recourse. As of December 31, 2015 and 2014, management had established a reserve of $454,000 and $379,000 , respectively, to account for future loan repurchases. The amortization of mortgage loan servicing rights is included within “Other service income”. Generally, mortgage servicing rights are capitalized and amortized on an individual sold loan basis. When a sold mortgage loan is paid off, the related mortgage servicing rights are fully amortized. Activity for mortgage servicing rights and the related valuation allowance follows: December 31 (In thousands) 2015 2014 2013 Mortgage servicing rights: Carrying amount, net, beginning of year $ 8,613 $ 9,013 $ 7,763 Additions 1,748 1,026 2,436 Amortization (1,637 ) (1,631 ) (2,479 ) Change in valuation allowance 284 205 1,293 Carrying amount, net, end of year $ 9,008 $ 8,613 $ 9,013 Valuation allowance: Beginning of year $ 826 $ 1,031 $ 2,324 Change in valuation allowance (284 ) (205 ) (1,293 ) End of year $ 542 $ 826 $ 1,031 The fair value of mortgage servicing rights was $9.6 million and $9.1 million at December 31, 2015 and 2014, respectively. The fair value of mortgage servicing rights at December 31, 2015 was established using a discount rate of 10% and constant prepayment speeds ranging from 6.3% to 22.0% . The fair value of mortgage servicing rights at December 31, 2014 was established using a discount rate of 10% and constant prepayment speeds ranging from 5.7% to 22.3% . Servicing fees included in other service income were $3.4 million , $3.5 million and $3.6 million for the years ended December 31, 2015, 2014 and 2013, respectively.

Fair Values

Fair Values	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Values	Fair Value The fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. The three levels of inputs that Park uses to measure fair value are as follows: • Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that Park has the ability to access as of the measurement date. • Level 2: Level 1 inputs for assets or liabilities that are not actively traded. Also consists of an observable market price for a similar asset or liability. This includes the use of “matrix pricing” to value debt securities absent the exclusive use of quoted prices. • Level 3: Consists of unobservable inputs that are used to measure fair value when observable market inputs are not available. This could include the use of internally developed models, financial forecasting and similar inputs. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability between market participants at the balance sheet date. When possible, the Company looks to active and observable markets to price identical assets or liabilities. When identical assets and liabilities are not traded in active markets, the Company looks to observable market data for similar assets and liabilities. However, certain assets and liabilities are not traded in observable markets and Park must use other valuation methods to develop a fair value. The fair value of impaired loans is typically based on the fair value of the underlying collateral, which is estimated through third-party appraisals or internal estimates of collateral values in accordance with Park's valuation requirements per its commercial and real estate loan policies. Assets and Liabilities Measured at Fair Value on a Recurring Basis : The following table presents assets and liabilities measured at fair value on a recurring basis: Fair Value Measurements at December 31, 2015 using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2015 Assets Investment securities: Obligations of U.S. Treasury and other U.S. Government sponsored entities $ — $ 522,063 $ — $ 522,063 U.S. Government sponsored entities’ asset-backed securities — 911,493 — 911,493 Equity securities 1,941 — 769 2,710 Mortgage loans held for sale — 7,306 — 7,306 Mortgage IRLCs — 165 — 165 Liabilities Fair value swap $ — $ — $ 226 $ 226 Fair Value Measurements at December 31, 2014 using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2014 Assets Investment securities: Obligations of U.S. Treasury and other U.S. Government sponsored entities $ — $ 538,064 $ — $ 538,064 U.S. Government sponsored entities’ asset-backed securities — 761,153 — 761,153 Equity securities 1,922 — 776 2,698 Mortgage loans held for sale — 5,264 — 5,264 Mortgage IRLCs — 70 — 70 Liabilities Fair value swap $ — $ — $ 226 $ 226 There were no transfers between Level 1 and Level 2 during 2015 or 2014 . Management’s policy is to transfer assets or liabilities from one level to another when the methodology to obtain the fair value changes such that there are more or fewer unobservable inputs as of the end of the reporting period. The following methods and assumptions were used by the Company in determining fair value of the financial assets and liabilities discussed above: Investment securities: Fair values for investment securities are based on quoted market prices, where available. If quoted market prices are not available, fair values are based on quoted market prices of comparable instruments. For securities where quoted prices or market prices of similar securities are not available, fair values are calculated using discounted cash flows. Fair value swap: The fair value of the swap agreement entered into with the purchaser of the Visa Class B shares represents an internally developed estimate of the exposure based upon probability-weighted potential Visa litigation losses. Mortgage Interest Rate Lock Commitments (IRLCs): IRLCs are based on current secondary market pricing and are classified as Level 2. Mortgage loans held for sale: Mortgage loans held for sale are carried at their fair value. Mortgage loans held for sale are estimated using security prices for similar product types and, therefore, are classified in Level 2. The table below is a reconciliation of the beginning and ending balances of the Level 3 inputs for the years ended December 31, 2015 and 2014 , for financial instruments measured on a recurring basis and classified as Level 3: Level 3 Fair Value Measurements (In thousands) Equity Securities Fair Value Swap Balance at January 1, 2015 $ 776 $ (226 ) Total Gains (Losses) Included in earnings - realized — — Included in earnings - unrealized — — Included in other comprehensive loss (7 ) — Purchases, sales, issuances and settlements, other, net — — Re-evaluation of fair value swap — — Balance at December 31, 2015 $ 769 $ (226 ) Balance at January 1, 2014 $ 759 $ (135 ) Total Gains (Losses) Included in earnings - realized — — Included in earnings - unrealized — — Included in other comprehensive income 17 — Purchases, sales, issuances and settlements, other, net — — Re-evaluation of fair value swap — (91 ) Balance at December 31, 2014 $ 776 $ (226 ) Assets and liabilities measured at fair value on a nonrecurring basis: The following methods and assumptions were used by the Company in determining the fair value of assets and liabilities measured at fair value on a nonrecurring basis described below: Impaired Loans: At the time a loan is considered impaired, it is valued at the lower of cost or fair value. Impaired loans carried at fair value have been partially charged-off or receive specific allocations of the allowance for loan losses. For collateral dependent loans, fair value is generally based on real estate appraisals. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available. Such adjustments result in a Level 3 classification of the inputs for determining fair value. Collateral is then adjusted or discounted based on management’s historical knowledge, changes in market conditions from the time of the valuation, and management’s expertise and knowledge of the client and client’s business, resulting in a Level 3 fair value classification. Impaired loans are evaluated on a quarterly basis for additional impairment and adjusted accordingly. Additionally, updated valuations are obtained annually for all impaired loans in accordance with Company policy. Other Real Estate Owned (OREO): Assets acquired through or in lieu of loan foreclosure are initially recorded at fair value less costs to sell when acquired. The carrying value of OREO is not re-measured to fair value on a recurring basis, but is subject to fair value adjustments when the carrying value exceeds the fair value, less estimated selling costs. Fair value is based on recent real estate appraisals and is updated at least annually. These appraisals may utilize a single valuation approach or a combination of approaches including the comparable sales approach and the income approach. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available. Such adjustments result in a Level 3 classification of the inputs for determining fair value. Appraisals for both collateral dependent impaired loans and OREO are performed by licensed appraisers. Appraisals are generally obtained to support the fair value of collateral. In general, there are three types of appraisals, real estate appraisals, income approach appraisals and lot development loan appraisals, received by the Company. These are discussed below: • Real estate appraisals typically incorporate measures such as recent sales prices for comparable properties. Appraisers may make adjustments to the sales prices of the comparable properties as deemed appropriate based on the age, condition or general characteristics of the subject property. Management generally applies a 15% discount to real estate appraised values which management expects will cover all disposition costs (including selling costs). This 15% is based on historical discounts to appraised values on sold OREO properties. • Income approach appraisals typically incorporate the annual net operating income of the business divided by an appropriate capitalization rate, as determined by the appraiser. Management generally applies a 15% discount to income approach appraised values which management expects will cover all disposition costs (including selling costs). • Lot development loan appraisals are typically performed using a discounted cash flow analysis. Appraisers determine an anticipated absorption period and a discount rate that takes into account an investor’s required rate of return based on recent comparable sales. Management generally applies a 6% discount to lot development appraised values, which is an additional discount above the net present value calculation included in the appraisal, to account for selling costs. MSRs: MSRs are carried at the lower of cost or fair value. MSRs do not trade in active, open markets with readily observable prices. For example, sales of MSRs do occur, but precise terms and conditions typically are not readily available. As such, management, with the assistance of a third-party specialist, determines fair value based on the discounted value of the future cash flows estimated to be received. Significant inputs include the discount rate and assumed prepayment speeds utilized. The calculated fair value is then compared to market values where possible to ascertain the reasonableness of the valuation in relation to current market expectations for similar products. Accordingly, MSRs are classified as Level 2. The following tables present assets and liabilities measured at fair value on a nonrecurring basis. Collateral dependent impaired loans are carried at fair value if they have been charged down to fair value or if a specific valuation allowance has been established. A new cost basis is established at the time a property is initially recorded in OREO. OREO properties are carried at fair value if a devaluation has been taken to the property's value subsequent to the initial measurement. The following table presents assets and liabilities measured at fair value on a nonrecurring basis: Fair Value Measurements at December 31, 2015 Using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2015 Impaired Loans: Commercial real estate $ — $ — $ 3,698 $ 3,698 Construction real estate: SEPH commercial land and development — — 2,044 2,044 Remaining commercial — — 1,872 1,872 Residential real estate — — 1,882 1,882 Total impaired loans $ — $ — $ 9,496 $ 9,496 Mortgage Servicing Rights $ — $ 1,867 $ — $ 1,867 Other Real Estate Owned: Commercial real estate — — 2,796 2,796 Construction real estate — — 3,387 3,387 Residential real estate — — 2,332 2,332 Total Other Real Estate Owned $ — $ — $ 8,515 $ 8,515 Fair Value Measurements at December 31, 2014 Using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2014 Impaired Loans: Commercial real estate $ — $ — $ 8,481 $ 8,481 Construction real estate: SEPH commercial land and development — — 2,078 2,078 Remaining commercial — — 3,483 3,483 Residential real estate — — 2,921 2,921 Total impaired loans $ — $ — $ 16,963 $ 16,963 Mortgage Servicing Rights $ — $ 2,928 $ — $ 2,928 Other Real Estate Owned: Commercial real estate — — 1,470 1,470 Construction real estate — — 6,473 6,473 Residential real estate — — 2,369 2,369 Total Other Real Estate Owned $ — $ — $ 10,312 $ 10,312 The table below provides additional detail on those impaired loans which are recorded at fair value as well as the remaining impaired loan portfolio not included above. The remaining impaired loans consist of loans which are not collateral dependent as well as loans carried at cost as the fair value of the underlying collateral or the present value of expected future cash flows on each of the loans exceeded the book value for each respective credit. December 31, 2015 (In thousands) Recorded Investment Prior Charge-Offs Specific Valuation Allowance Carrying Balance Impaired loans recorded at fair value $ 11,783 $ 10,512 $ 2,287 $ 9,496 Remaining impaired loans 68,881 18,193 1,904 66,977 Total impaired loans $ 80,664 $ 28,705 $ 4,191 $ 76,473 December 31, 2014 (In thousands) Recorded Investment Prior Charge-Offs Specific Valuation Allowance Carrying Balance Impaired loans recorded at fair value $ 19,643 $ 19,731 $ 2,680 $ 16,963 Remaining impaired loans 54,069 12,749 980 53,089 Total impaired loans $ 73,712 $ 32,480 $ 3,660 $ 70,052 The expense of credit adjustments related to impaired loans carried at fair value for the years ended December 31, 2015 , 2014 and 2013 was $2.1 million , $3.0 million , and $8.1 million , respectively. MSRs totaled $9.0 million at December 31, 2015 . Of this $9.0 million MSR carrying balance, $1.9 million was recorded at fair value and included a valuation allowance of $0.5 million . The remaining $7.1 million was recorded at cost, as the fair value exceeded cost at December 31, 2015 . At December 31, 2014 , MSRs totaled $8.6 million . Of this $8.6 million MSR carrying balance, $2.9 million was recorded at fair value and included a valuation allowance of $0.8 million . T he remaining $5.7 million was recorded at cost, as the fair value exceeded cost at December 31, 2014 . Income related to MSRs carried at fair value for the years ended December 31, 2015 , 2014 and 2013 was $0.3 million , $0.2 million and $1.3 million , respectively. Total OREO held by Park at December 31, 2015 and 2014 was $18.7 million and $22.6 million , respectively. Approximately 46% of OREO held by Park at December 31, 2015 and 2014 was carried at fair value due to fair value adjustments made subsequent to the initial OREO measurement. At December 31, 2015 and 2014 , OREO held at fair value, less estimated selling costs, amounted to $8.5 million and $10.3 million , respectively. The net expense related to OREO fair value adjustments was $1.6 million , $2.4 million and $3.2 million for the years ended December 31, 2015 , 2014 and 2013 , respectively. The following tables present qualitative information about Level 3 fair value measurements for financial instruments measured at fair value on a non-recurring basis at December 31, 2015 and December 31, 2014 : December 31, 2015 (In thousands) Fair Value Valuation Technique Unobservable Input(s) Range (Weighted Average) Impaired loans: Commercial real estate $ 3,698 Sales comparison approach Adj to comparables 0.0% - 45.9% (20.3%) Income approach Capitalization rate 7.0% - 13.3% (9.5%) Cost approach Accumulated depreciation 50.0% (50.0%) Construction real estate: SEPH commercial land and development $ 2,044 Sales comparison approach Adj to comparables 5.0% - 40.0% (22.1%) Bulk sale approach Discount rate 10.7% (10.7%) Remaining commercial $ 1,872 Sales comparison approach Adj to comparables 0.0% - 25.3% (1.0%) Bulk sale approach Discount rate 10.0% - 10.7% (10.0%) Residential real estate $ 1,882 Sales comparison approach Adj to comparables 0.0% - 96.7% (12.5%) Income approach Capitalization rate 3.8% - 10.1% (9.1%) Cost approach Accumulated depreciation 33.3% - 50.0% (43.4%) Other real estate owned: Commercial real estate $ 2,796 Sales comparison approach Adj to comparables 2.0% - 71.0% (26.9%) Income approach Capitalization rate 9.5% (9.5%) Construction real estate $ 3,387 Sales comparison approach Adj to comparables 0.0% - 85.0% (24.3%) Bulk sale approach Discount rate 15.0% (15.0%) Residential real estate $ 2,332 Sales comparison approach Adj to comparables 0.1% - 61.8% (23.0%) December 31, 2014 (In thousands) Fair Value Valuation Technique Unobservable Input(s) Range (Weighted Average) Impaired loans: Commercial real estate $ 8,481 Sales comparison approach Adj to comparables 0.0% - 84.0% (38.8%) Income approach Capitalization rate 8.0% - 9.5% (9.4%) Cost approach Accumulated depreciation 23.0% (23.0%) Construction real estate: SEPH commercial land and development $ 2,078 Sales comparison approach Adj to comparables 5.0% - 35.0% (17.5%) Bulk sale approach Discount rate 10.8% (10.8%) Remaining commercial $ 3,483 Sales comparison approach Adj to comparables 0.2% - 76.0% (45.4%) Bulk sale approach Discount rate 10.0% - 22.0% (16.5%) Residential real estate $ 2,921 Sales comparison approach Adj to comparables 0.0% - 120.6% (11.1%) Income approach Capitalization rate 7.9% - 10.0% (8.0%) Other real estate owned: Commercial real estate $ 1,470 Sales comparison approach Adj to comparables 0.0% - 87.0% (30.5%) Income approach Capitalization rate 8.4% - 10.0% (9.4%) Cost approach Accumulated depreciation 60.0% - 95.0% (77.5%) Construction real estate $ 6,473 Sales comparison approach Adj to comparables 0.0% - 82.9% (27.1%) Bulk sale approach Discount rate 15.0% (15.0%) Residential real estate $ 2,369 Sales comparison approach Adj to comparables 0.0% - 38.3% (10.1%) Income approach Capitalization rate 6.8% - 7.8% (7.6%) The following methods and assumptions were used by the Corporation in estimating its fair value disclosures for assets and liabilities not discussed above: Cash and cash equivalents: The carrying amounts reported in the Consolidated Balance Sheets for cash and short-term instruments approximate those assets’ fair values. FHLB stock and FRB stock: These assets are carried at their respective redemption values as it is not practical to calculate their fair values. Loans receivable: For variable-rate loans that reprice frequently and with no significant change in credit risk, fair values are based on carrying values. The fair values for certain mortgage loans (e.g., one-to-four family residential) are based on quoted market prices of similar loans sold in conjunction with securitization transactions, adjusted for differences in loan characteristics. The fair values for other loans are estimated using discounted cash flow analyses, based upon interest rates currently being offered for loans with similar terms to borrowers of similar credit quality. The methods utilized to estimate fair value do not necessarily represent an exit price. Off-balance sheet instruments: Fair values for the Corporation’s loan commitments and standby letters of credit are based on the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the counterparties’ credit standing. The carrying amount and fair value are not material. Deposit liabilities: The fair values disclosed for demand deposits (e.g., interest and non-interest checking, savings, and money market accounts) are, by definition, equal to the amount payable on demand at the reporting date (i.e., their carrying amounts). The carrying amounts for variable-rate, fixed-term certificates of deposit approximate their fair values at the reporting date. Fair values for fixed-rate certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities of time deposits. Short-term borrowings: The carrying amounts of federal funds purchased, borrowings under repurchase agreements and other short-term borrowings approximate their fair values. Long-term debt: Fair values for long-term debt are estimated using a discounted cash flow calculation that applies interest rates currently being offered on long-term debt to a schedule of monthly maturities. Subordinated notes: Fair values for subordinated notes are estimated using a discounted cash flow calculation that applies interest rate spreads currently being offered on similar debt structures to a schedule of monthly maturities. The fair value of financial instruments at December 31, 2015 and December 31, 2014 , was as follows: December 31, 2015 Fair Value Measurements (In thousands) Carrying value Level 1 Level 2 Level 3 Total fair value Financial assets: Cash and money market instruments $ 149,459 $ 149,459 $ — $ — $ 149,459 Investment securities 1,585,568 1,941 1,584,984 769 1,587,694 Accrued interest receivable - securities 4,436 — 4,436 — 4,436 Accrued interest receivable - loans 14,239 — — 14,239 14,239 Mortgage loans held for sale 7,306 — 7,306 — 7,306 Impaired loans carried at fair value 9,496 — — 9,496 9,496 Mortgage IRLCs 165 — 165 — 165 Other loans 4,994,624 — — 4,997,318 4,997,318 Loans receivable, net $ 5,011,591 $ — $ 7,471 $ 5,006,814 $ 5,014,285 Financial liabilities: Non-interest bearing checking accounts $ 1,404,032 $ 1,404,032 $ — $ — $ 1,404,032 Interest bearing transaction accounts 1,107,200 1,107,200 — — 1,107,200 Savings accounts 1,544,708 1,544,708 — — 1,544,708 Time deposits 1,290,412 — 1,295,329 — 1,295,329 Other 1,290 1,290 — — 1,290 Total deposits $ 5,347,642 $ 4,057,230 $ 1,295,329 $ — $ 5,352,559 Short-term borrowings $ 394,242 $ — $ 394,242 $ — $ 394,242 Long-term debt 738,105 — 771,420 — 771,420 Subordinated notes 45,000 — 41,596 — 41,596 Accrued interest payable – deposits 987 66 921 — 987 Accrued interest payable – debt/borrowings 1,351 4 1,347 — 1,351 Derivative financial instruments: Fair value swap $ 226 $ — $ — $ 226 $ 226 December 31, 2014 Fair Value Measurements (In thousands) Carrying value Level 1 Level 2 Level 3 Total fair value Financial assets: Cash and money market instruments $ 237,699 $ 237,699 $ — $ — $ 237,699 Investment securities 1,442,477 1,922 1,442,708 775 1,445,405 Accrued interest receivable - securities 4,048 — 4,048 — 4,048 Accrued interest receivable - loans 13,629 — — 13,629 13,629 Mortgage loans held for sale 5,264 — 5,264 — 5,264 Impaired loans carried at fair value 16,963 — — 16,963 16,963 Mortgage IRLCs 70 — 70 — 70 Other loans 4,753,033 — — 4,757,461 4,757,461 Loans receivable, net $ 4,775,330 $ — $ 5,334 $ 4,774,424 $ 4,779,758 Financial liabilities: Non-interest bearing checking accounts $ 1,269,296 $ 1,269,296 $ — — $ 1,269,296 Interest bearing transaction accounts 1,122,079 1,122,079 — — 1,122,079 Savings accounts 1,325,445 1,325,445 — — 1,325,445 Time deposits 1,409,911 — 1,422,885 — 1,422,885 Other 1,269 1,269 — — 1,269 Total deposits $ 5,128,000 $ 3,718,089 $ 1,422,885 $ — $ 5,140,974 Short-term borrowings $ 276,980 $ — $ 276,980 $ — $ 276,980 Long-term debt 786,602 — 827,500 — 827,500 Subordinated notes 45,000 — 42,995 — 42,995 Accrued interest payable – deposits 1,125 14 1,111 — 1,125 Accrued interest payable – debt/borrowings 1,426 3 1,423 — 1,426 Derivative financial instruments: Fair value swap $ 226 $ — $ — $ 226 $ 226

Capital Ratios

Capital Ratios	12 Months Ended
	Dec. 31, 2015
Capital [Abstract]
Capital Ratios	Capital Ratios Financial institution regulators have established guidelines for minimum capital ratios for banks, thrifts and bank holding companies. During the first quarter of 2015, Park adopted the new Basel III regulatory capital framework as approved by the federal banking agencies. The adoption of this new framework modified the calculation of the various capital ratios, added a new ratio, common equity tier 1, and revised the adequately and well capitalized thresholds. Additionally, under the new rule, in order to avoid limitations on capital distributions, including dividend payments, Park must hold a capital conservation buffer above the adequately capitalized risk-based capital ratios. The capital conservation buffer is being phased in from 0.0% for 2015 to 2.50% by 2019. The amounts shown below as the adequately capitalized ratio plus capital conservation buffer includes the fully phased-in 2.50% buffer. PNB met each of the well capitalized ratio guidelines at December 31, 2015. The following table indicates the capital ratios for PNB and Park at December 31, 2015 and 2014. As of December 31, 2015 Leverage Tier 1 Risk-Based Common Equity Tier 1 Total Risk-Based The Park National Bank 7.06 % 9.83 % 9.83 % 11.37 % Park National Corporation 9.22 % 12.82 % 12.54 % 14.49 % Adequately capitalized ratio 4.00 % 6.00 % 4.50 % 8.00 % Adequately capitalized ratio plus capital conservation buffer 4.00 % 8.50 % 7.00 % 10.50 % Well capitalized ratio (PNB only) 5.00 % 8.00 % 6.50 % 10.00 % As of December 31, 2014 Leverage Tier 1 Risk-Based Common Equity Tier 1 Total Risk-Based The Park National Bank 6.96 % 10.13 % N/A 11.74 % Park National Corporation 9.25 % 13.39 % N/A 15.14 % Adequately capitalized ratio 4.00 % 4.00 % N/A 8.00 % Well capitalized ratio (PNB only) 5.00 % 6.00 % N/A 10.00 % Failure to meet the minimum requirements above could cause the FRB to take action. PNB is also subject to the capital requirements of its primary regulator, the OCC. As of December 31, 2015 and 2014 , Park and PNB were well-capitalized and met all capital requirements to which each was then subject. There are no conditions or events since PNB's most recent regulatory report filings, that management believes have changed the risk categories for PNB. The following table reflects various measures of capital for Park and PNB: To Be Adequately Capitalized To Be Well Capitalized (In thousands) Actual Amount Ratio Amount Ratio Amount Ratio At December 31, 2015 Total Risk-Based Capital PNB $ 588,467 11.37 % $ 414,079 8.00 % $ 517,599 10.00 % Park 758,988 14.49 % 419,080 8.00 % N/A N/A Tier 1 Risk-Based Capital PNB $ 508,763 9.83 % $ 310,560 6.00 % $ 414,079 8.00 % Park 671,664 12.82 % 314,310 6.00 % N/A N/A Leverage Ratio PNB $ 508,763 7.06 % $ 288,147 4.00 % $ 360,183 5.00 % Park 671,664 9.22 % 291,449 4.00 % N/A N/A Common Equity Tier 1 PNB $ 508,763 9.83 % $ 232,920 4.50 % $ 336,439 6.50 % Park 656,664 12.54 % 235,732 4.50 % N/A N/A At December 31, 2014 Total Risk-Based Capital PNB $ 563,188 11.74 % $ 383,634 8.00 % $ 479,542 10.00 % Park 739,517 15.14 % 390,822 8.00 % N/A N/A Tier 1 Risk-Based Capital PNB $ 485,943 10.13 % $ 191,817 4.00 % $ 287,725 6.00 % Park 654,339 13.39 % 195,411 4.00 % N/A N/A Leverage Ratio PNB $ 485,943 6.96 % $ 279,210 4.00 % $ 349,013 5.00 % Park 654,339 9.25 % 282,992 4.00 % N/A N/A Common Equity Tier 1 PNB N/A N/A N/A N/A N/A N/A Park N/A N/A N/A N/A N/A N/A

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Segment Information	Segment Information The Corporation is a financial holding company headquartered in Newark, Ohio. The operating segments for the Corporation are its chartered national bank subsidiary, PNB (headquartered in Newark, Ohio), SEPH and GFSC. GAAP requires management to disclose information about the different types of business activities in which a company engages and also information on the different economic environments in which a company operates, so that the users of the financial statements can better understand a company’s performance, better understand the potential for future cash flows, and make more informed judgments about the company as a whole. Park’s current operating segments are in line with GAAP as: (i) discrete financial information is available for each operating segment and (ii) the segments are aligned with internal reporting to Park’s Chief Executive Officer and President, who is the chief operating decision maker. Operating results for the year ended December 31, 2015 (In thousands) PNB GFSC SEPH All Other Total Net interest income (loss) $ 220,879 $ 6,588 $ (74 ) $ 239 $ 227,632 Provision for (recovery of) loan losses 7,665 1,415 (4,090 ) — 4,990 Other income 75,188 2 1,848 513 77,551 Other expense 167,476 2,984 6,182 9,972 186,614 Income (loss) before taxes 120,926 2,191 (318 ) (9,220 ) 113,579 Income taxes (benefit) 36,581 768 (111 ) (4,671 ) 32,567 Net income (loss) $ 84,345 $ 1,423 $ (207 ) $ (4,549 ) $ 81,012 Balances at December 31, 2015 Assets $ 7,229,764 $ 35,793 $ 33,541 $ 12,256 $ 7,311,354 Loans 5,029,072 35,469 15,153 (11,609 ) 5,068,085 Deposits 5,447,293 4,627 — (104,278 ) 5,347,642 Operating results for the year ended December 31, 2014 (In thousands) PNB GFSC SEPH All Other Total Net interest income (loss) $ 218,641 $ 7,457 $ 958 $ (2,012 ) $ 225,044 Provision for (recovery of) loan losses 3,517 1,544 (12,394 ) — (7,333 ) Other income (loss) 69,384 (1 ) 5,991 175 75,549 Other expense 163,641 4,103 11,766 8,000 187,510 Income (loss) before taxes 120,867 1,809 7,577 (9,837 ) 120,416 Income taxes (benefit) 37,960 634 2,652 (4,787 ) 36,459 Net income (loss) $ 82,907 $ 1,175 $ 4,925 $ (5,050 ) $ 83,957 Balances at December 31, 2014 Assets $ 6,910,386 $ 40,308 $ 43,762 $ 6,743 $ 7,001,199 Loans 4,781,761 40,645 23,956 (16,680 ) 4,829,682 Deposits 5,222,766 5,883 — (100,649 ) 5,128,000 Operating results for the year ended December 31, 2013 (In thousands) PNB GFSC SEPH All Other Total Net interest income (loss) $ 210,781 $ 8,741 $ (1,325 ) $ 2,828 $ 221,025 Provision for (recovery of) loan losses 14,039 1,175 (11,799 ) — 3,415 Other income 70,841 11 1,956 469 73,277 Other expense 158,651 3,133 12,211 7,520 181,515 Income (loss) before taxes 108,932 4,444 219 (4,223 ) 109,372 Income taxes (benefit) 33,696 1,556 77 (2,826 ) 32,503 Net income (loss) $ 75,236 $ 2,888 $ 142 $ (1,397 ) $ 76,869 Balances at December 31, 2013 Assets $ 6,522,174 $ 47,115 $ 72,781 $ (5,647 ) $ 6,636,423 Loans 4,559,406 47,228 38,014 (24,143 ) 4,620,505 Deposits 4,896,405 7,159 — (113,570 ) 4,789,994 The following is a reconciliation of financial information for the reportable segments to the Corporation’s consolidated totals: 2015 (In thousands) Net Interest Income Depreciation Expense Other Expense Income Taxes Assets Deposits Totals for reportable segments $ 227,393 $ 7,347 $ 169,295 $ 37,238 $ 7,299,098 $ 5,451,920 Elimination of intersegment items 2,561 — — — (13,557 ) (104,278 ) Parent Co. totals - not eliminated (2,322 ) — 9,972 (4,671 ) 25,813 — Totals $ 227,632 $ 7,347 $ 179,267 $ 32,567 $ 7,311,354 $ 5,347,642 2014 (In thousands) Net Interest Income Depreciation Expense Other Expense Income Taxes Assets Deposits Totals for reportable segments $ 227,056 $ 7,243 $ 172,267 $ 41,246 $ 6,994,456 $ 5,228,649 Elimination of intersegment items 3,708 — — — (18,556 ) (100,649 ) Parent Co. totals - not eliminated (5,720 ) — 8,000 (4,787 ) 25,299 — Totals $ 225,044 $ 7,243 $ 180,267 $ 36,459 $ 7,001,199 $ 5,128,000 2013 (In thousands) Net Interest Income Depreciation Expense Other Expense Income Taxes Assets Deposits Totals for reportable segments $ 218,197 $ 7,315 $ 166,680 $ 35,329 $ 6,642,070 $ 4,903,564 Elimination of intersegment items 8,659 — — — (30,369 ) (113,570 ) Parent Co. totals - not eliminated (5,831 ) — 7,520 (2,826 ) 24,722 — Totals $ 221,025 $ 7,315 $ 174,200 $ 32,503 $ 6,636,423 $ 4,789,994

Parent Company Statements

Parent Company Statements	12 Months Ended
	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Parent Company Statements	Parent Company Statements The Parent Company statements should be read in conjunction with the consolidated financial statements and the information set forth below. Investments in subsidiaries are accounted for using the equity method of accounting. The effective tax rate for the Parent Company is substantially less than the statutory rate due principally to tax-exempt dividends from subsidiaries. Cash represents non-interest bearing deposits with PNB. Net cash provided by operating activities reflects cash payments (received from subsidiaries) for income taxes of $4.13 million , $5.81 million and $2.54 million in 2015 , 2014 and 2013 , respectively. At December 31, 2015 and 2014 , shareholders’ equity reflected in the Parent Company balance sheet includes $199.4 million and $196.5 million , respectively, of undistributed earnings of the Corporation’s subsidiaries which are restricted from transfer as dividends to the Corporation. Balance Sheets December 31, 2015 and 2014 (In thousands) 2015 2014 Assets: Cash $ 102,416 $ 98,671 Investment in subsidiaries 613,383 599,855 Debentures receivable from PNB 25,000 25,000 Other investments 2,341 2,344 Other assets 23,443 23,260 Total assets $ 766,583 $ 749,130 Liabilities: Subordinated notes 45,000 45,000 Other liabilities 8,228 7,589 Total liabilities 53,228 52,589 Total shareholders’ equity 713,355 696,541 Total liabilities and shareholders’ equity $ 766,583 $ 749,130 Statements of Income for the years ended December 31, 2015, 2014 and 2013 (In thousands) 2015 2014 2013 Income: Dividends from subsidiaries $ 60,000 $ 60,000 $ 15,000 Interest and dividends 2,561 3,708 8,659 Other 560 262 531 Total income 63,121 63,970 24,190 Expense: Other, net 12,341 13,807 13,413 Total expense 12,341 13,807 13,413 Income before federal taxes and equity in undistributed income of subsidiaries 50,780 50,163 10,777 Federal income tax benefit 4,671 4,787 2,826 Income before equity in undistributed income of subsidiaries 55,451 54,950 13,603 Equity in undistributed income of subsidiaries 25,561 29,007 63,266 Net income $ 81,012 $ 83,957 $ 76,869 Other comprehensive (loss) income (1) (2,035 ) 21,811 (17,901 ) Comprehensive income 78,977 105,768 58,968 (1) See Consolidated Statements of Comprehensive Income for other comprehensive (loss) income detail Statements of Cash Flows for the years ended December 31, 2015, 2014 and 2013 (In thousands) 2015 2014 2013 Operating activities: Net income $ 81,012 $ 83,957 $ 76,869 Adjustments to reconcile net income to net cash provided by operating activities: Undistributed income of subsidiaries (25,561 ) (29,007 ) (63,266 ) Compensation expense for issuance of treasury stock to directors 963 801 850 Share-based compensation expense 865 458 — Decrease in other assets (182 ) (1,292 ) (2,215 ) Increase (decrease) in other liabilities 485 298 (2,187 ) Net cash provided by operating activities 57,582 55,215 10,051 Investing activities: Capital contribution in subsidiary — — (45,000 ) Repayment of investments in and advances to subsidiaries 10,000 32,000 101,960 Net cash provided by investing activities 10,000 32,000 56,960 Financing activities: Cash dividends paid (57,776 ) (57,876 ) (57,949 ) Repayment of subordinated notes — (35,250 ) — Repurchase of treasury shares (6,058 ) (2,355 ) (843 ) Cash payment for fractional shares (3 ) (5 ) (3 ) Net cash used in financing activities (63,837 ) (95,486 ) (58,795 ) Increase (decrease) in cash 3,745 (8,271 ) 8,216 Cash at beginning of year 98,671 106,942 98,726 Cash at end of year $ 102,416 $ 98,671 $ 106,942

Summary of Significant Accoun38

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include the accounts of Park National Corporation and its subsidiaries (“Park”, the “Company” or the “Corporation”). Material intercompany accounts and transactions have been eliminated.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. generally accepted accounting principles ("GAAP") requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. Management has identified the allowance for loan losses, accounting for Other Real Estate Owned (“OREO”), fair value accounting, accounting for goodwill and accounting for pension plan and other post-retirement benefits as significant estimates.
Reclassifications	Reclassifications Certain prior year amounts have been reclassified to conform with the current year presentation. Additionally, prior period financial statements reflect the retrospective application of Accounting Standards Update ("ASU") 2014-01, Investments-Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects.
Restrictions on Cash and Due from Banks	Restrictions on Cash and Due from Banks The Corporation’s national bank subsidiary is required to maintain average reserve balances with the Federal Reserve Bank. The average required reserve balance was approximately $44.2 million at December 31, 2015 and $40.3 million at December 31, 2014 . No other compensating balance arrangements were in existence at December 31, 2015 .
Investment Securities	Investment Securities Investment securities are classified upon acquisition into one of three categories: held-to-maturity ("HTM"), available-for-sale ("AFS"), or trading (see Note 5 - Investment Securities). HTM securities are those securities that the Corporation has the positive intent and ability to hold to maturity and are recorded at amortized cost. AFS securities are those securities that would be available to be sold in the future in response to the Corporation’s liquidity needs, changes in market interest rates, and asset-liability management strategies, among other reasons. AFS securities are reported at fair value, with unrealized holding gains and losses excluded from earnings but included in other comprehensive income (loss), net of applicable taxes. The Corporation did not hold any trading securities during any period presented. AFS and HTM securities are evaluated quarterly for potential other-than-temporary impairment. Management considers the facts related to each security including the nature of the security, the amount and duration of the loss, the credit quality of the issuer, the expectations for that security’s performance and whether Park intends to sell, or it is more likely than not that Park will be required to sell, a security in an unrealized loss position before recovery of its amortized cost basis. Declines in the value of equity securities that are considered to be other-than-temporary are recorded as a charge to earnings in the Consolidated Statements of Income. Declines in the value of debt securities that are considered to be other-than-temporary are separated into (1) the amount of the total impairment related to credit loss and (2) the amount of the total impairment related to all other factors. The amount of the total other-than-temporary impairment related to the credit loss is recognized in earnings. The amount of the total other-than-temporary impairment related to all other factors is recognized in other comprehensive income (loss), net of tax. Interest income from investment securities includes amortization of purchase premium or discount. Premiums and discounts on securities are amortized on the level-yield method without anticipating prepayments, except for mortgage-backed securities where prepayments are anticipated. Gains and losses realized on the sale of investment securities are recorded on the trade date and determined using the specific identification basis.
Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) Stock	Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) Stock Park’s national bank subsidiary, The Park National Bank ("PNB") is a member of the FHLB. Additionally, PNB is a member of the FRB. Members are required to own a certain amount of stock based on their level of borrowings and other factors and may invest in additional amounts. FHLB stock and FRB stock are classified as restricted securities and are carried at their redemption value within other investment securities on the Consolidated Balance Sheets. Impairment is evaluated based on the ultimate recovery of par value. Both cash and stock dividends are reported as income.
Bank Owned Life Insurance	Bank Owned Life Insurance Park has purchased insurance policies on the lives of directors and certain key officers. Bank owned life insurance is recorded at its cash surrender value (or the amount that can be realized).
Mortgage Loans Held For Sale	Loans Held for Sale Generally, loans held for sale are carried at the lower of cost or fair value. Park has elected the fair value option for mortgage loans held for sale, which are carried at their fair value.
Mortgage Banking Derivatives	Mortgage Banking Derivatives Commitments to fund mortgage loans (interest rate locks) to be sold into the secondary market and forward commitments for the future delivery of these mortgage loans are accounted for as free standing derivatives. The fair values of these mortgage derivatives are estimated based on changes in mortgage interest rates from the date the interest rate on the loan is locked. The Company enters into forward commitments for the future delivery of mortgage loans when interest rate locks are entered into, in order to hedge the change in interest rates resulting from its commitments to fund the loans. Changes in the fair values of these derivatives are included in net gains on sale of loans.
Loans	Loans Loans that management has the intent and ability to hold for the foreseeable future or until maturity or payoff, are reported at their outstanding principal balances adjusted for any charge-offs, any deferred fees or costs on originated loans, and any unamortized premiums or discounts on purchased loans. Interest income is reported on the interest method and includes amortization of net deferred loan origination fees and costs over the loan term. Commercial loans include: (1) commercial, financial and agricultural loans; (2) commercial real estate loans; (3) those commercial loans in the real estate construction loan segment; and (4) those commercial loans in the residential real estate loan segment. Consumer loans include: (1) mortgage and installment loans included in the real estate construction segment; (2) mortgage, home equity lines of credit (HELOC), and installment loans included in the residential real estate segment; and (3) all loans included in the consumer segment. Generally, commercial loans are placed on nonaccrual status at 90 days past due and consumer and residential mortgage loans are placed on nonaccrual status at 120 days past due. Commercial loans placed on nonaccrual status are considered impaired (see Note 6 - Loans). For loans which are on nonaccrual status, it is Park’s policy to reverse interest previously accrued on the loans against interest income. Interest on such loans may be recorded on a cash basis and be included in earnings only when cash is actually received. Park’s charge-off policy for commercial loans requires management to establish a specific reserve or record a charge-off as soon as it is apparent that the borrower is troubled and there is, or likely will be, a collateral shortfall related to the estimated value of the collateral securing the loan. The Company’s charge-off policy for consumer loans is dependent on the class of the loan. Residential mortgage loans, HELOCs, and consumer loans secured by residential real estate are typically charged down to the value of the collateral, less estimated selling costs, at 180 days past due. The charge-off policy for other consumer loans, primarily installment loans, requires a monthly review of delinquent loans and a complete charge-off for any account that reaches 120 days past due. The delinquency status of a loan is based on contractual terms and not on how recently payments have been received. Loans may be removed from nonaccrual status when loan payments have been received to cure the delinquency status, the borrower has demonstrated the ability to maintain current payment status in accordance with the loan agreement and the loan is deemed to be well-secured by management. A description of each segment of the loan portfolio, along with the risk characteristics of each segment, is included below: Commercial, financial and agricultural: Commercial, financial and agricultural loans are made for a wide variety of general corporate purposes, including financing for commercial and industrial businesses, financing for equipment, inventories and accounts receivable, acquisition financing and commercial leasing. The term of each commercial loan varies by its purpose. Repayment terms are structured such that commercial loans will be repaid within the economic useful life of the underlying asset. The commercial loan portfolio includes loans to a wide variety of corporations and businesses across many industrial classifications originated in the 28 Ohio counties where PNB operates. The primary industries represented by these customers include manufacturing, retail trade, health care and other services. Commercial real estate: Commercial real estate (“CRE”) loans include mortgage loans to developers and owners of commercial real estate. The lending policy for CRE loans is designed to address the unique risk attributes of CRE lending. The collateral for these CRE loans is the underlying commercial real estate. Construction real estate: The Company defines construction loans as both commercial construction loans and residential construction loans where the loan proceeds are used exclusively for the improvement of real estate as to which the Company holds a mortgage. Construction loans may be in the form of a permanent loan or short-term construction loan, depending on the needs of the individual borrower. Construction financing is generally considered to involve a higher degree of risk of loss than long-term financing on improved, occupied real estate. Risk of loss on a construction loan depends largely upon the accuracy of the initial estimate of the property’s value at completion of construction and the estimated cost (including interest) of construction. If the estimate of construction cost proves to be inaccurate, the PNB division making the loan may be required to advance funds beyond the amount originally committed to permit completion of the project. If the estimate of value proves inaccurate, the PNB division may be confronted, at or prior to the maturity of the loan, with a project having a value insufficient to assure full repayment, should the borrower default. In the event that a default on a construction loan occurs and foreclosure follows, the PNB division must take control of the project and attempt to either arrange for completion of construction or dispose of the unfinished project. Additional risk exists with respect to loans made to developers who do not have a buyer for the property, as the developer may lack funds to pay the loan if the property is not sold upon completion. PNB and its divisions attempt to reduce such risks on loans to developers by requiring personal guarantees and reviewing current personal financial statements and tax returns as well as other projects undertaken by the developer. Residential real estate: The Company defines residential real estate loans as first mortgages on individuals’ primary residences or second mortgages of individuals’ primary residences in the form of HELOCs or installment loans. Credit approval for residential real estate loans requires demonstration of sufficient income to repay the principal and interest and the real estate taxes and insurance, stability of employment, an established credit record and an appraised value of the real estate securing the loan. Consumer: The Company originates direct and indirect consumer loans, primarily automobile loans and home equity based lines of credit to customers in its primary market areas. Credit approval for consumer loans requires income sufficient to repay principal and interest due, stability of employment, an established credit record and sufficient collateral for secured loans. Consumer loans typically have shorter terms and lower balances with higher yields as compared to real estate mortgage loans, but generally carry higher risks of default. Consumer loan collections are dependent on the borrower’s financial stability, and thus are more likely to be affected by adverse personal circumstances.
Allowance for Loan Losses	Allowance for Loan Losses The allowance for loan losses is that amount believed adequate to absorb probable incurred credit losses in the loan portfolio based on management’s evaluation of various factors. The determination of the allowance requires significant estimates, including the timing and amounts of expected cash flows on impaired loans, consideration of current economic conditions, and historical loss experience pertaining to pools of homogeneous loans, all of which may be susceptible to change. The allowance is increased through a provision for loan losses that is charged to earnings based on management’s quarterly evaluation of the factors previously mentioned and is reduced by charge-offs, net of recoveries. The allowance for loan losses includes both (1) an estimate of loss based on historical loss experience within both commercial and consumer loan categories with similar characteristics (“statistical allocation”) and (2) an estimate of loss based on an impairment analysis of each commercial loan that is considered to be impaired (“specific allocation”). In calculating the allowance for loan losses, management believes it is appropriate to utilize historical loss rates that are comparable to the current period being analyzed, giving consideration to losses experienced over a full cycle. For the historical loss factor at December 31, 2015 , the Company utilized an annual loss rate (“historical loss experience”), calculated based on an average of the net charge-offs and the annual change in specific reserves for impaired commercial loans, experienced during 2009 through 2015 within the individual segments of the commercial and consumer loan categories. Management believes the 84 -month historical loss experience methodology is appropriate in the current economic environment, as it captures loss rates consistent with current expectations based on current economic conditions. The loss factor applied to Park’s consumer portfolio as of December 31, 2015 was based on the historical loss experience over the past 84 months, plus an additional judgmental reserve, increasing the total allowance for loan loss coverage in the consumer portfolio to approximately 1.99 years of historical loss. The consumer loan portfolio loss coverage ratio was 1.98 years at December 31, 2014 . The loss factor applied to Park’s commercial portfolio as of December 31, 2015 was based on the historical loss experience over the past 84 months, plus additional reserves for consideration of (1) a loss emergence period factor, (2) a loss migration factor and (3) a judgmental or environmental loss factor. These additional reserves increased the total allowance for loan loss coverage in the commercial portfolio to approximately 2.52 years of historical loss at December 31, 2015. The commercial loan portfolio loss coverage ratio was 2.28 years at December 31, 2014 . Park’s commercial loans are individually risk graded. If loan downgrades occur, the probability of default increases and accordingly management allocates a higher percentage reserve to those accruing commercial loans graded special mention and substandard. The judgmental increases discussed above incorporate management’s evaluation of the impact of environmental qualitative factors which pose additional risks and assign a component of the allowance for loan losses in consideration of these factors. Such environmental factors include: national and local economic trends and conditions; experience, ability and depth of lending management and staff; effects of any changes in lending policies and procedures; and levels of, and trends in, consumer bankruptcies, delinquencies, impaired loans and charge-offs and recoveries. GAAP requires a specific allocation to be established as a component of the allowance for loan losses for certain loans when it is probable that all amounts due pursuant to the contractual terms of the loans will not be collected, and the recorded investment in the loans exceeds their measure of impairment. Management considers the following related to commercial loans when determining if a loan should be considered impaired : (1) current debt service coverage levels of the borrowing entity; (2) payment history over the most recent 12-month period; (3) other signs of deterioration in the borrower’s financial situation, such as changes in credit scores; and (4) consideration of global cash flows of financially sound guarantors that have previously supported loan payments. The recorded investment is the carrying balance of the loan, plus accrued interest receivable, both as of the end of the year. Impairment is measured using either the present value of expected future cash flows based upon the initial effective interest rate on the loan, or the fair value of the collateral. If a loan is considered to be collateral dependent, the fair value of collateral, less estimated selling costs, is used to measure impairment.
Troubled Debt Restructuring (TDRs)	Troubled Debt Restructuring ("TDRs") Management classifies loans as TDRs when a borrower is experiencing financial difficulty and Park has granted a concession. In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed of the probability that the borrower will be in payment default on any of the borrower's debt in the foreseeable future without the modification. This evaluation is performed under the Company’s internal underwriting policy. Management’s policy is to modify loans by extending the term or by granting a temporary or permanent contractual interest rate below the market rate, not by forgiving debt. A court's discharge of a borrower's debt in a Chapter 7 bankruptcy is considered a concession when the borrower does not reaffirm the discharged debt. TDRs are separately identified for impairment disclosures and are measured at the present value of estimated future cash flows using the loan’s effective rate at inception. If a TDR is considered to be a collateral dependent loan, the loan is reported, net, at the fair value of the collateral.
Income Recognition	Income Recognition Income earned by the Corporation and its subsidiaries is recognized on the accrual basis of accounting, except for nonaccrual loans as previously discussed, and late charges on loans which are recognized as income when they are collected.
Premises and Equipment	Premises and Equipment Land is carried at cost and is not subject to depreciation. Premises and equipment are carried at cost, less accumulated depreciation and amortization. Depreciation is generally provided on the straight-line method over the estimated useful lives of the related assets. Leasehold improvements are amortized over the shorter of the remaining lease period or the estimated useful lives of the improvements. Upon the sale or other disposal of an asset, the cost and related accumulated depreciation are removed from the accounts and the resulting gain or loss is recognized. Maintenance and repairs are charged to expense as incurred while renewals and improvements that extend the useful life of an asset are capitalized. Premises and equipment are evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount of a particular asset may not be recoverable. The range of depreciable lives over which premises and equipment are being depreciated are: Buildings 30 Years Equipment, furniture and fixtures 3 to 12 Years Leasehold improvements 1 to 10 Years
Other Real Estate Owned (OREO)	Other Real Estate Owned Management transfers a loan to OREO at the time that Park takes deed/title of the asset. OREO is initially recorded at fair value less anticipated selling costs (net realizable value), establishing a new cost basis, and consists of property acquired through foreclosure and real estate held for sale. If the net realizable value is below the carrying value of the loan at the date of transfer, the difference is charged to the allowance for loan losses. These assets are subsequently accounted for at the lower of cost or fair value less costs to sell. Subsequent changes in the value of real estate are classified as OREO valuation adjustments, are reported as adjustments to the carrying amount of OREO and are recorded within “Other income”. In certain circumstances where management believes the devaluation may not be permanent in nature, Park utilizes a valuation allowance to record OREO devaluations, which is also expensed through “Other income”. Costs relating to development and improvement of such properties are capitalized (not in excess of fair value less estimated costs to sell) and costs relating to holding the properties are charged to "Other expense".
Mortgage Loan Servicing Rights	Mortgage Servicing Rights ("MSR") When Park sells mortgage loans with servicing rights retained, servicing rights are recorded at an amount not to exceed fair value with the income statement effect recorded in "Other service income." Capitalized servicing rights are amortized in proportion to and over the period of the estimated future servicing income of the underlying loan and are included within “Other service income”. Mortgage servicing rights are assessed for impairment periodically, based on fair value, with any impairment recognized through a valuation allowance. The fair value of mortgage servicing rights is determined by discounting estimated future cash flows from the servicing assets, using market discount rates and expected future prepayment rates. In order to calculate fair value, the sold loan portfolio is stratified into homogeneous pools of like categories. (See Note 24 - Loan Servicing.) Fees received for servicing mortgage loans owned by investors are based on a percentage of the outstanding monthly principal balance of such loans and are included in income as loan payments are received. The cost of servicing loans is charged to expense as incurred.
Goodwill and Other Intangible Assets	Goodwill Goodwill represents the excess of the purchase price over net identifiable tangible and intangible assets acquired in a purchase business combination. Other intangible assets represent purchased assets that have no physical property but represent some future economic benefit to their owner and are capable of being sold or exchanged on their own or in combination with a related asset or liability. Goodwill and indefinite-lived intangible assets are not amortized to expense, but are subject to impairment tests annually, or more frequently if events or changes in circumstances indicate that the asset might be impaired. Intangible assets with definitive useful lives (such as core deposit intangibles) are amortized to expense over their estimated useful lives. Management considers several factors when performing the annual impairment tests on goodwill. The factors considered include the operating results for the particular Park segment for the past year and the operating results budgeted for the current year (including multi-year projections), the deposit and loan totals of the Park segment and the economic conditions in the markets served by the Park segment. At December 31, 2015, the goodwill remaining on Park's Consolidated Balance Sheet consisted entirely of goodwill at PNB. (See Note 27 - Segment Information for operating segment results.) GAAP requires a company to perform an impairment test on goodwill annually, or more frequently if events or changes in circumstances indicate that the asset might be impaired, by assessing qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If after assessing these events or circumstances, it is concluded that it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test is unnecessary. If the carrying amount of the goodwill exceeds the fair value, an impairment charge must be recorded in an amount equal to the excess. Park evaluates goodwill for impairment on April 1 of each year, with financial data as of March 31. Based on the analysis performed as of April 1, 2015, the Company determined that goodwill for Park’s national bank subsidiary (PNB) was not impaired. There have been no subsequent circumstances or events triggering an additional evaluation.
Consolidated Statement of Cash Flows	Consolidated Statement of Cash Flows Cash and cash equivalents include cash and cash items, amounts due from banks and money market instruments. Generally, money market instruments are purchased and sold for one-day periods.
Loss Contingencies and Guarantees	Loss Contingencies and Guarantees Loss contingencies, including claims and legal actions arising in the ordinary course of business, are recorded as liabilities when the likelihood of loss is probable and an amount or range of loss can be reasonably estimated.
Income Tax, Policy [Policy Text Block]	Income Taxes The Corporation accounts for income taxes using the asset and liability approach. Under this method, deferred tax assets and liabilities are determined based on differences between financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. To the extent that Park does not consider it more likely than not that a deferred tax asset will be recovered, a valuation allowance is recorded. All positive and negative evidence is reviewed when determining how much of a valuation allowance is recognized on a quarterly basis. A valuation allowance, if needed, reduces deferred tax assets to the amount expected to be realized. An uncertain tax position is recognized as a benefit only if it is “more-likely-than-not” that the tax position would be sustained in a tax examination being presumed to occur. The benefit recognized for a tax position that meets the “more-likely-than-not” criteria is measured based on the largest benefit that is more than 50 percent likely to be realized, taking into consideration the amounts and probabilities of the outcome upon settlement. For tax positions not meeting the “more-likely-than-not” test, no tax benefit is recorded. Park recognizes any interest and penalties related to income tax matters in income tax expense.
Treasury Shares	Treasury Shares The purchase of Park’s common shares is recorded at cost. At the date of retirement or subsequent reissuance, the treasury shares account is reduced by the weighted average cost of the common shares retired or reissued.
Comprehensive Income	Comprehensive Income Comprehensive income consists of net income and other comprehensive income (loss). Other comprehensive income (loss) includes unrealized gains and losses on securities available for sale, and changes in the funded status of the Company’s defined benefit pension plan, which are also recognized as separate components of equity.
Stock Based Compensation	Share-Based Compensation Compensation cost is recognized for restricted stock units and stock awards issued to employees and directors, based on the fair value of these awards at the date of grant. The market price of Park’s common shares at the date of grant is used to estimate the fair value of restricted stock units and stock awards. Compensation cost is recognized over the required service period, generally defined as the vesting period and is recorded in "Salaries" expense. (See Note 17 - Share - Based Compensation.)
Loan Commitments and Related Financial Instruments	Loan Commitments and Related Financial Instruments Financial instruments include off‑balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded.
Fair Value Measurement	Fair Value Measurement Fair values of financial instruments are estimated using relevant market information and other assumptions, as more fully disclosed in Note 25 - Fair Value . Fair value estimates involve uncertainties and matters of significant judgment regarding interest rates, credit risk, prepayments, and other factors, especially in the absence of broad markets for particular items. Changes in assumptions or in market conditions could significantly affect the estimates.
Transfers and Financial Assets	Transfers of Financial Assets Transfers of financial assets are accounted for as sales, when control over the assets has been relinquished. Control over transferred assets is deemed to be surrendered when the assets have been isolated from the Company, the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity.
Retirement Plans	Retirement Plans Pension expense is the net of service and interest cost, return on plan assets and amortization of gains and losses not immediately recognized. Employee KSOP plan expense is the amount of matching contributions to Park's employees stock ownership plan. Deferred compensation and supplemental retirement plan expense allocates the benefits over years of service. (See Note 18 - Benefit Plans.)
Earnings Per Common Share	Earnings Per Common Share Basic earnings per common share is net income available to common shareholders divided by the weighted average number of common shares outstanding during the period. Diluted earnings per common share includes the dilutive effect of additional potential common shares issuable under stock awards, stock options, warrants and convertible securities. Earnings and dividends per common share are restated for any stock splits and stock dividends through the date of issuance of the consolidated financial statements. (See Note 21 - Earnings Per Common Share.)
Segment Reporting, Policy [Policy Text Block]	Operating Segments The Corporation is a financial holding company headquartered in Newark, Ohio. The operating segments for the Corporation are its chartered national bank subsidiary, PNB (headquartered in Newark, Ohio), SE Property Holdings, LLC ("SEPH"), and Guardian Financial Services Company ("GFSC").
Adoption of New Accounting Pronouncements	Adoption of New Accounting Pronouncements ASU 2014-01- Investments-Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects (a consensus of the FASB Emerging Issues Task Force): In January 2014, the Financial Accounting Standards Board (the "FASB") issued ASU 2014-01, Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Qualified Affordable Housing Projects (a consensus of the FASB Emerging Issues Task Force). The ASU permits reporting entities to make an accounting policy election to account for their investments in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportional amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense. Additionally, a reporting entity should disclose information that enables users of its financial statements to understand the nature of its investments in qualified affordable housing projects, and the effect of the measurement of its investments in qualified affordable housing projects and the related tax credits on its financial position and results of operations. The new guidance became effective for annual periods, and interim reporting periods within those annual periods, beginning after December 15, 2014. Park adopted this guidance in the first quarter of 2015. The guidance was applied retrospectively to all prior periods presented. The adoption resulted in adjustments to reduce beginning retained earnings, other assets and the prior periods consolidated statements of income. See Note 11 - Investment in Qualified Affordable Housing for further details. ASU 2014-04 - Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure (a consensus of the FASB Emerging Issues Task Force): In January 2014, FASB issued ASU 2014-04, Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40): Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure (a consensus of the FASB Emerging Issues Task Force). This new ASU clarifies when an in substance repossession or foreclosure occurs and a creditor is considered to have received physical possession of real estate property collateralizing a consumer mortgage loan. Specifically, the new ASU requires a creditor to reclassify a collateralized consumer mortgage loan to real estate property upon obtaining legal title to the real estate collateral, or the borrower voluntarily conveying all interest in the real estate property to the lender to satisfy the loan through a deed in lieu of foreclosure or similar legal agreement. Additional disclosures are required detailing the amount of foreclosed residential real estate property held by the creditor and the recorded investment in consumer mortgages collateralized by real estate property that are in the process of foreclosure. The new guidance is effective for annual periods, and interim reporting periods within those annual periods, beginning after December 15, 2014. The adoption of this guidance as of January 1, 2015 did not have a material impact on Park's consolidated financial statements, but resulted in additional disclosures. See Note 9 - Other Real Estate Owned. ASU 2014-09 - Revenue from Contracts with Customers (Topic 606): In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) . The ASU creates a new topic, Topic 606, to provide guidance on revenue recognition for entities that enter into contracts with customers to transfer goods or services or enter into contracts for the transfer of nonfinancial assets. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Additional disclosures are required to provide quantitative and qualitative information regarding the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The new guidance is effective for annual reporting periods, and interim reporting periods within those annual periods, beginning after December 15, 2017. Management is currently evaluating the impact of the adoption of this guidance on Park's consolidated financial statements. ASU 2014-11 - Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures: In June 2014, the FASB issued ASU 2014-11, Transfers and Servicing (Topic 860): Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures . The amendments in this ASU change the accounting for repurchase-to-maturity transactions and linked repurchase financings to secured borrowing accounting, which is consistent with the accounting for other repurchase agreements. The amendments also require two new disclosures. The first disclosure requires an entity to disclose information on transfers accounted for as sales in transactions that are economically similar to repurchase agreements. The second disclosure provides increased transparency about the types of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings. The accounting changes are effective for annual periods, and interim reporting periods within those annual periods, beginning after December 15, 2014. The disclosure for certain transactions accounted for as a sale is required to be presented for interim and annual periods beginning after December 15, 2014, with all other disclosure requirements required to be presented for annual periods beginning after December 15, 2014, and for interim periods beginning after March 15, 2015. The adoption of this guidance as of January 1, 2015 did not have an impact on Park's consolidated financial statements, but resulted in additional disclosures. See Note 13 - Repurchase Agreement Borrowings. ASU 2015-02 - Consolidation (Topic 810): Amendments to the Consolidation Analysis : In February 2015, the FASB issued ASU 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis. The ASU amends the current consolidation guidance and affects both the variable interest entity and voting interest entity consolidation models. The new guidance is effective for annual reporting periods and interim reporting periods within those annual periods, beginning after December 15, 2015. Early adoption is permitted. Management is currently evaluating the impact of the adoption of this guidance on Park’s consolidated financial statements. ASU 2016-01 - Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. In January 2016, the FASB issued ASU 2016-01 - Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities . Changes to the current GAAP model primarily affects the accounting for equity investments, financial liabilities under the fair value option, and the presentation and disclosure requirements for financial instruments. In addition, the ASU clarifies guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale securities. The new guidance is effective for annual reporting period and interim reporting periods within those annual periods, beginning after December 15, 2017. Management is currently evaluating the impact of the adoption of this guidance on Park’s consolidated financial statements.

Summary of Significant Accoun39

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Schedule of depreciable lives of premises and equipment	The range of depreciable lives over which premises and equipment are being depreciated are: Buildings 30 Years Equipment, furniture and fixtures 3 to 12 Years Leasehold improvements 1 to 10 Years

Goodwill (Tables)

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Schedule of Indefinite-Lived Intangible Assets [Table Text Block]	The following table reflects the activity in goodwill and other intangible assets for the years ended December 31, 2015 , 2014 and 2013 . (In thousands) Goodwill Core Deposit Intangibles Total January 1, 2013 $ 72,334 $ 337 $ 72,671 Amortization — (337 ) (337 ) December 31, 2013 $ 72,334 $ — $ 72,334 Amortization — — — December 31, 2014 $ 72,334 $ — $ 72,334 Amortization — — — December 31, 2015 $ 72,334 $ — $ 72,334

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Schedule of marketable securities	Investment securities at December 31, 2015 and December 31, 2014 were as follows: (In thousands) Amortized Cost Gross Unrealized/Unrecognized Holding Gains Gross Unrealized/Unrecognized Holding Losses Estimated Fair Value 2015: Securities Available-for-Sale Obligations of U.S. Treasury and other U.S. Government sponsored entities $ 527,605 $ — $ 5,542 $ 522,063 U.S. Government sponsored entities’ asset-backed securities 907,989 8,776 5,272 911,493 Other equity securities 1,120 1,590 — 2,710 Total $ 1,436,714 $ 10,366 $ 10,814 $ 1,436,266 2015: Securities Held-to-Maturity Obligations of states and political subdivisions $ 48,190 $ 734 $ — $ 48,924 U.S. Government sponsored entities’ asset-backed securities 101,112 1,526 134 102,504 Total $ 149,302 $ 2,260 $ 134 $ 151,428 (In thousands) Amortized Cost Gross Unrealized/Unrecognized Holding Gains Gross Unrealized/Unrecognized Holding Losses Estimated Fair Value 2014: Securities Available-for-Sale Obligations of U.S. Treasury and other U.S. Government sponsored entities $ 546,886 $ 11 $ 8,833 $ 538,064 U.S. Government sponsored entities’ asset-backed securities 751,974 13,421 4,242 761,153 Other equity securities 1,120 1,578 — 2,698 Total $ 1,299,980 $ 15,010 $ 13,075 $ 1,301,915 2014: Securities Held-to-Maturity U.S. Government sponsored entities’ asset-backed securities $ 140,562 $ 3,088 $ 160 $ 143,490
Schedule of unrealized loss on investments	The following table provides detail on investment securities with unrealized losses aggregated by investment category and length of time the individual securities had been in a continuous loss position at December 31, 2015 and December 31, 2014 : Less than 12 Months 12 Months or Longer Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses 2015: Securities Available-for-Sale Obligations of U.S. Treasury and other U.S. Government sponsored entities $ 326,973 $ 2,117 $ 195,090 $ 3,425 $ 522,063 $ 5,542 U.S. Government sponsored entities' asset-backed securities 384,169 2,776 114,543 2,496 498,712 5,272 Total $ 711,142 $ 4,893 $ 309,633 $ 5,921 $ 1,020,775 $ 10,814 2015: Securities Held-to-Maturity U.S. Government sponsored entities’ asset-backed securities $ 5,656 $ 10 $ 7,792 $ 124 $ 13,448 $ 134 Less than 12 Months 12 Months or Longer Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses 2014: Securities Available-for-Sale Obligations of U.S. Treasury and other U.S. Government sponsored entities $ 119,913 $ 87 $ 388,140 $ 8,746 $ 508,053 $ 8,833 U.S. Government sponsored entities' asset-backed securities 73,276 136 170,430 4,106 243,706 4,242 Total $ 193,189 $ 223 $ 558,570 $ 12,852 $ 751,759 $ 13,075 2014: Securities Held-to-Maturity U.S. Government sponsored entities' asset-backed securities $ 8,032 $ 148 $ 2,714 $ 12 $ 10,746 $ 160
Schedule of contractual maturity of debt securities	The amortized cost and estimated fair value of investments in debt securities at December 31, 2015 , are shown in the following table by contractual maturity, except for asset-backed securities, which are shown as a single total, due to the unpredictability of the timing in principal repayments. (In thousands) Amortized Cost Estimated Fair Value Tax Equivalent Yield Securities Available-for-Sale U.S. Treasury and other U.S. Government sponsored entities’ notes: Due one through five years $ 220,000 $ 219,135 1.29 % Due five through ten years 307,605 302,928 2.40 % Total $ 527,605 $ 522,063 1.94 % U.S. Government sponsored entities’ asset-backed securities $ 907,989 $ 911,493 2.23 % Securities Held-to-Maturity Obligations of states and political subdivisions Due greater than ten years $ 48,190 $ 48,924 4.65 % Total $ 48,190 $ 48,924 4.65 % U.S. Government sponsored entities’ asset-backed securities $ 101,112 $ 102,504 3.42 %

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2015
Loans and Leases Receivable Disclosure [Abstract]
Schedule of composition of loan portfolio by class of loan	The composition of the loan portfolio, by class of loan, as of December 31, 2015 and December 31, 2014 was as follows: 12/31/2015 12/31/2014 (In thousands) Loan Balance Accrued Interest Receivable Recorded Investment Loan Balance Accrued Interest Receivable Recorded Investment Commercial, financial and agricultural * $ 955,727 $ 3,437 $ 959,164 $ 856,535 $ 3,218 $ 859,753 Commercial real estate * 1,113,603 4,009 1,117,612 1,069,637 3,546 1,073,183 Construction real estate: SEPH commercial land and development 2,044 — 2,044 2,195 — 2,195 Remaining commercial 128,046 321 128,367 115,139 300 115,439 Mortgage 36,722 75 36,797 31,148 72 31,220 Installment 6,533 21 6,554 7,322 23 7,345 Residential real estate: Commercial 410,571 1,014 411,585 417,612 1,038 418,650 Mortgage 1,210,819 1,469 1,212,288 1,189,709 1,548 1,191,257 HELOC 211,415 769 212,184 216,915 803 217,718 Installment 22,638 78 22,716 27,139 97 27,236 Consumer 967,111 3,032 970,143 893,160 2,967 896,127 Leases 2,856 14 2,870 3,171 17 3,188 Total loans $ 5,068,085 $ 14,239 $ 5,082,324 $ 4,829,682 $ 13,629 $ 4,843,311 * Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class.
Schedule of recorded investment in nonaccrual restructured and loans past due 90 days or more and accruing	The following table presents the recorded investment in nonaccrual loans, accruing troubled debt restructurings ("TDRs"), and loans past due 90 days or more and still accruing by class of loan as of December 31, 2015 and December 31, 2014 : 12/31/2015 (In thousands) Nonaccrual Loans Accruing Troubled Debt Restructurings Loans Past Due 90 Days or More and Accruing Total Nonperforming Loans Commercial, financial and agricultural $ 21,676 $ 8,947 $ — $ 30,623 Commercial real estate 15,268 2,757 — 18,025 Construction real estate: SEPH commercial land and development 2,044 — — 2,044 Remaining commercial 4,162 514 — 4,676 Mortgage 7 110 — 117 Installment 64 114 — 178 Residential real estate: Commercial 25,063 261 — 25,324 Mortgage 20,378 10,143 851 31,372 HELOC 1,749 873 27 2,649 Installment 1,657 635 4 2,296 Consumer 3,819 734 1,093 5,646 Total loans $ 95,887 $ 25,088 $ 1,975 $ 122,950 12/31/2014 (In thousands) Nonaccrual Loans Accruing Troubled Debt Restructurings Loans Past Due 90 Days or More and Accruing Total Nonperforming Loans Commercial, financial and agricultural $ 18,826 $ 297 $ 229 $ 19,352 Commercial real estate 19,299 2,690 — 21,989 Construction real estate: SEPH commercial land and development 2,078 — — 2,078 Remaining commercial 5,558 51 — 5,609 Mortgage 59 94 9 162 Installment 115 125 — 240 Residential real estate: Commercial 24,336 594 — 24,930 Mortgage 21,869 10,349 1,329 33,547 HELOC 1,879 630 9 2,518 Installment 1,743 779 — 2,522 Consumer 4,631 723 1,133 6,487 Total loans $ 100,393 $ 16,332 $ 2,709 $ 119,434
Schedule of loans individually evaluated for impairment and loans collectively evaluated for impairment	The following table provides additional information regarding those nonaccrual and accruing TDR loans that are individually evaluated for impairment and those collectively evaluated for impairment as of December 31, 2015 and December 31, 2014 . 12/31/2015 12/31/2014 (In thousands) Nonaccrual and accruing TDRs Loans individually evaluated for impairment Loans collectively evaluated for impairment Nonaccrual and accruing TDRs Loans individually evaluated for impairment Loans collectively evaluated for impairment Commercial, financial and agricultural $ 30,623 $ 30,595 $ 28 $ 19,123 $ 19,106 $ 17 Commercial real estate 18,025 18,025 — 21,989 21,989 — Construction real estate: SEPH commercial land and development 2,044 2,044 — 2,078 2,078 — Remaining commercial 4,676 4,676 — 5,609 5,609 — Mortgage 117 — 117 153 — 153 Installment 178 — 178 240 — 240 Residential real estate: Commercial 25,324 25,324 — 24,930 24,930 — Mortgage 30,521 — 30,521 32,218 — 32,218 HELOC 2,622 — 2,622 2,509 — 2,509 Installment 2,292 — 2,292 2,522 — 2,522 Consumer 4,553 — 4,553 5,354 — 5,354 Total loans $ 120,975 $ 80,664 $ 40,311 $ 116,725 $ 73,712 $ 43,013
Schedule of loans individually evaluated for impairment by class of loan	The following table presents loans individually evaluated for impairment by class of loan as of December 31, 2015 and December 31, 2014 . 12/31/2015 12/31/2014 (In thousands) Unpaid principal balance Recorded investment Allowance for loan losses allocated Unpaid principal balance Recorded investment Allowance for loan losses allocated With no related allowance recorded Commercial, financial and agricultural $ 32,583 $ 18,763 $ — $ 30,601 $ 17,883 $ — Commercial real estate 15,138 14,916 — 27,923 20,696 — Construction real estate: SEPH commercial land and development 10,834 2,044 — 11,026 2,078 — Remaining commercial 2,506 1,531 — 1,427 391 — Residential real estate: Commercial 23,798 23,480 — 25,822 23,352 — With an allowance recorded Commercial, financial and agricultural 16,155 11,832 1,904 1,251 1,223 981 Commercial real estate 3,195 3,109 381 1,310 1,293 262 Construction real estate: Remaining commercial 3,145 3,145 1,356 5,218 5,218 1,812 Residential real estate: Commercial 1,951 1,844 550 1,578 1,578 605 Total $ 109,305 $ 80,664 $ 4,191 $ 106,156 $ 73,712 $ 3,660
Schedule of average recorded investment and interest income recognized on loans individually evaluated for impairment	The following tables present the average recorded investment and interest income recognized subsequent to impairment on loans individually evaluated for impairment as of and for the years ended December 31, 2015 , 2014 , and 2013 : Year ended December 31, 2015 (In thousands) Recorded Investment as of December 31, 2015 Average recorded investment Interest income recognized Commercial, financial and agricultural $ 30,595 $ 20,179 $ 340 Commercial real estate 18,025 17,883 550 Construction real estate: SEPH commercial land and development 2,044 2,066 21 Remaining commercial 4,676 5,666 26 Residential real estate: Commercial 25,324 24,968 1,026 Consumer — — — Total $ 80,664 $ 70,762 $ 1,963 Year ended December 31, 2014 (In thousands) Recorded Investment as of December 31, 2014 Average recorded investment Interest income recognized Commercial, financial and agricultural $ 19,106 $ 19,518 $ 360 Commercial real estate 21,989 31,945 1,027 Construction real estate: SEPH commercial land and development 2,078 3,658 146 Remaining commercial 5,609 8,784 61 Residential real estate: Commercial 24,930 28,306 1,084 Consumer — 403 — Total $ 73,712 $ 92,614 $ 2,678 Year ended December 31, 2013 (In thousands) Recorded Investment as of December 31, 2013 Average recorded investment Interest income recognized Commercial, financial and agricultural $ 20,727 $ 20,523 $ 412 Commercial real estate 41,822 41,426 1,151 Construction real estate: SEPH commercial land and development 4,777 8,723 — Remaining commercial 10,782 17,829 616 Residential real estate: Commercial 33,408 34,972 461 Consumer 799 616 — Total $ 112,315 $ 124,089 $ 2,640
Schedule of aging of the recorded investment in past due loans	The following tables present the aging of the recorded investment in past due loans as of December 31, 2015 and December 31, 2014 by class of loan. 12/31/2015 (In thousands) Accruing loans past due 30-89 days Past due nonaccrual loans and loans past due 90 days or more and accruing * Total past due Total current Total recorded investment Commercial, financial and agricultural $ 670 $ 7,536 $ 8,206 $ 950,958 $ 959,164 Commercial real estate 142 530 672 1,116,940 1,117,612 Construction real estate: SEPH commercial land and development — 2,044 2,044 — 2,044 Remaining commercial 165 84 249 128,118 128,367 Mortgage 63 7 70 36,727 36,797 Installment 200 46 246 6,308 6,554 Residential real estate: Commercial 325 19,521 19,846 391,739 411,585 Mortgage 10,569 8,735 19,304 1,192,984 1,212,288 HELOC 487 186 673 211,511 212,184 Installment 426 318 744 21,972 22,716 Consumer 11,458 3,376 14,834 955,309 970,143 Leases — — — 2,870 2,870 Total loans $ 24,505 $ 42,383 $ 66,888 $ 5,015,436 $ 5,082,324 * Includes $2.0 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans. 12/31/2014 (In thousands) Accruing loans past due 30-89 days Past due nonaccrual loans and loans past due 90 days or more and accruing * Total past due Total current Total recorded investment Commercial, financial and agricultural $ 6,482 $ 7,508 $ 13,990 $ 845,763 $ 859,753 Commercial real estate 808 8,288 9,096 1,064,087 1,073,183 Construction real estate: SEPH commercial land and development — 2,068 2,068 127 2,195 Remaining commercial 166 77 243 115,196 115,439 Mortgage 39 68 107 31,113 31,220 Installment 21 25 46 7,299 7,345 Residential real estate: Commercial 250 19,592 19,842 398,808 418,650 Mortgage 11,146 10,637 21,783 1,169,474 1,191,257 HELOC 262 387 649 217,069 217,718 Installment 596 464 1,060 26,176 27,236 Consumer 11,304 3,818 15,122 881,005 896,127 Leases — — — 3,188 3,188 Total loans $ 31,074 $ 52,932 $ 84,006 $ 4,759,305 $ 4,843,311
Schedule of recorded investment by loan grade	The tables below present the recorded investment by loan grade at December 31, 2015 and December 31, 2014 for all commercial loans: 12/31/2015 (In thousands) 5 Rated 6 Rated Impaired Pass Rated Recorded Investment Commercial, financial and agricultural* $ 4,392 $ 347 $ 30,623 $ 923,802 $ 959,164 Commercial real estate* 14,880 3,417 18,025 1,081,290 1,117,612 Construction real estate: SEPH commercial land and development — — 2,044 — 2,044 Remaining commercial 2,151 122 4,676 121,418 128,367 Residential real estate: Commercial 3,280 386 25,324 382,595 411,585 Leases — — — 2,870 2,870 Total Commercial Loans $ 24,703 $ 4,272 $ 80,692 $ 2,511,975 $ 2,621,642 * Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class. 12/31/2014 (In thousands) 5 Rated 6 Rated Impaired Pass Rated Recorded Investment Commercial, financial and agricultural* $ 1,874 $ 1,201 $ 19,123 $ 837,555 $ 859,753 Commercial real estate* 8,448 1,712 21,989 1,041,034 1,073,183 Construction real estate: SEPH commercial land and development — — 2,078 117 2,195 Remaining commercial 3,349 57 5,609 106,424 115,439 Residential real estate: Commercial 2,581 598 24,930 390,541 418,650 Leases — — — 3,188 3,188 Total Commercial Loans $ 16,252 $ 3,568 $ 73,729 $ 2,378,859 $ 2,472,408
Schedule of troubled debt restructurings on financing receivables	The following tables detail the number of contracts modified as TDRs during the years ended December 31, 2015 , 2014 and 2013 as well as the recorded investment of these contracts at December 31, 2015 , 2014 , and 2013. The recorded investment pre- and post-modification is generally the same due to the fact that Park does not typically forgive principal. Year ended December 31, 2015 (In thousands) Number of Contracts Accruing Nonaccrual Recorded Investment Commercial, financial and agricultural 39 $ 8,948 $ 3,640 $ 12,588 Commercial real estate 14 637 3,523 4,160 Construction real estate: SEPH commercial land and development — — — — Remaining commercial 2 513 — 513 Mortgage 1 19 — 19 Installment — — — — Residential real estate: Commercial 11 — 1,185 1,185 Mortgage 39 1,132 2,122 3,254 HELOC 26 315 45 360 Installment 9 — 155 155 Consumer 283 202 888 1,090 Total loans 424 $ 11,766 $ 11,558 $ 23,324 Year ended December 31, 2014 (In thousands) Number of Contracts Accruing Nonaccrual Recorded Investment Commercial, financial and agricultural 30 $ 292 $ 431 $ 723 Commercial real estate 11 1,184 1,254 2,438 Construction real estate: SEPH commercial land and development — — — — Remaining commercial 2 — 206 206 Mortgage — — — — Installment 2 — 56 56 Residential real estate: Commercial 9 — 866 866 Mortgage 46 32 2,325 2,357 HELOC 10 85 241 326 Installment 10 109 12 121 Consumer 330 244 1,058 1,302 Total loans 450 $ 1,946 $ 6,449 $ 8,395 Year ended December 31, 2013 (In thousands) Number of Contracts Accruing Nonaccrual Recorded Investment Commercial, financial and agricultural 34 $ 7 $ 1,334 $ 1,341 Commercial real estate 22 — 8,563 8,563 Construction real estate: SEPH commercial land and development — — — — Remaining commercial 3 — 98 98 Mortgage — — — — Installment 4 26 25 51 Residential real estate: Commercial 15 — 2,552 2,552 Mortgage 62 1,967 2,278 4,245 HELOC 16 175 — 175 Installment 13 113 179 292 Consumer 327 805 345 1,150 Total loans 496 $ 3,093 $ 15,374 $ 18,467
Schedule recorded investment in financing receivables which were modified as troubled debt restructurings within the previous 12 months and for which there was a payment default during the 12 month	The following table presents the recorded investment in financing receivables which were modified as TDRs within the previous 12 months and for which there was a payment default during the year ended December 31, 2015 , December 31, 2014 , and December 31, 2013. For this table, a loan is considered to be in default when it becomes 30 days contractually past due under modified terms. The additional allowance for loan loss resulting from the defaults on TDR loans was immaterial. Year ended December 31, 2015 Year ended December 31, 2014 Year ended December 31, 2013 (In thousands) Number of Contracts Recorded Investment Number of Contracts Recorded Investment Number of Contracts Recorded Investment Commercial, financial and agricultural 1 $ 1 4 $ 206 11 $ 771 Commercial real estate 1 626 1 302 11 2,839 Construction real estate: SEPH commercial land and development — — — — — — Remaining commercial — — — — — — Mortgage — — — — — — Installment — — — — 1 10 Residential real estate: Commercial 3 1,005 1 3 4 1,683 Mortgage 12 682 14 810 26 1,533 HELOC 1 5 2 160 — — Installment 2 101 2 12 5 72 Consumer 47 434 62 516 74 471 Leases — — — — — — Total loans 67 $ 2,854 $ 86 $ 2,009 132 $ 7,379

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2015
Allowance For Loan Losses [Abstract]
Schedule of the activity in the allowance for loan losses	The activity in the allowance for loan losses for the years ended December 31, 2015 , 2014 , and 2013 is summarized in the following tables. Year ended December 31, 2015 (In thousands) Commercial, financial and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for credit losses: Beginning balance $ 10,719 $ 8,808 $ 8,652 $ 14,772 $ 11,401 $ — $ 54,352 Charge-offs 2,478 348 470 2,352 8,642 — 14,290 Recoveries (1,373 ) (2,241 ) (2,092 ) (2,438 ) (3,295 ) (3 ) (11,442 ) Net charge-offs (recoveries) 1,105 (1,893 ) (1,622 ) (86 ) 5,347 (3 ) 2,848 Provision (Recovery) $ 4,080 $ (1,504 ) $ (1,710 ) $ (1,344 ) $ 5,470 $ (2 ) $ 4,990 Ending balance $ 13,694 $ 9,197 $ 8,564 $ 13,514 $ 11,524 1 $ 56,494 Year ended December 31, 2014 (In thousands) Commercial, financial and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for credit losses: Beginning balance $ 14,218 $ 15,899 $ 6,855 $ 14,251 $ 8,245 $ — $ 59,468 Charge-offs 3,779 8,003 1,316 3,944 7,738 — 24,780 Recoveries (1,003 ) (7,759 ) (12,572 ) (2,985 ) (2,671 ) (7 ) (26,997 ) Net charge-offs (recoveries) 2,776 244 (11,256 ) 959 5,067 (7 ) (2,217 ) (Recovery) Provision (723 ) (6,847 ) (9,459 ) 1,480 8,223 (7 ) (7,333 ) Ending balance $ 10,719 $ 8,808 $ 8,652 $ 14,772 $ 11,401 — $ 54,352 Year ended December 31, 2013 (In thousands) Commercial, financial and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for credit losses: Beginning balance $ 15,635 $ 11,736 $ 6,841 $ 14,759 $ 6,566 $ — $ 55,537 Charge-offs 6,160 1,832 1,791 3,207 6,163 — 19,153 Recoveries (1,314 ) (726 ) (9,378 ) (6,000 ) (2,249 ) (2 ) (19,669 ) Net charge-offs (recoveries) 4,846 1,106 (7,587 ) (2,793 ) 3,914 (2 ) (516 ) Provision (Recovery) 3,429 5,269 (7,573 ) (3,301 ) 5,593 (2 ) 3,415 Ending balance $ 14,218 $ 15,899 $ 6,855 $ 14,251 $ 8,245 — $ 59,468
Schedule of the composition of the allowance for loan losses	The composition of the allowance for loan losses at December 31, 2015 and 2014 was as follows: December 31, 2015 (In thousands) Commercial, financial, and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for loan losses: Ending allowance balance attributed to loans Individually evaluated for impairment $ 1,904 $ 381 $ 1,356 $ 550 $ — $ — $ 4,191 Collectively evaluated for impairment 11,790 8,816 7,208 12,964 11,524 1 52,303 Total ending allowance balance $ 13,694 $ 9,197 $ 8,564 $ 13,514 $ 11,524 $ 1 $ 56,494 Loan Balance: Loans individually evaluated for impairment $ 30,545 $ 18,015 $ 6,716 $ 25,323 $ — $ — $ 80,599 Loans collectively evaluated for impairment 925,182 1,095,588 166,629 1,830,120 967,111 2,856 4,987,486 Total ending loan balance $ 955,727 $ 1,113,603 $ 173,345 $ 1,855,443 $ 967,111 $ 2,856 $ 5,068,085 Allowance for loan losses as a percentage of loan balance: Loans individually evaluated for impairment 6.23 % 2.11 % 20.19 % 2.17 % — % — % 5.20 % Loans collectively evaluated for impairment 1.27 % 0.80 % 4.33 % 0.71 % 1.19 % 0.04 % 1.05 % Total 1.43 % 0.83 % 4.94 % 0.73 % 1.19 % 0.04 % 1.11 % Recorded Investment: Loans individually evaluated for impairment $ 30,595 $ 18,025 $ 6,720 $ 25,324 $ — $ — $ 80,664 Loans collectively evaluated for impairment 928,569 1,099,587 167,042 1,833,449 970,143 2,870 5,001,660 Total ending recorded investment $ 959,164 $ 1,117,612 $ 173,762 $ 1,858,773 $ 970,143 $ 2,870 $ 5,082,324 December 31, 2014 (In thousands) Commercial, financial, and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for loan losses: Ending allowance balance attributed to loans Individually evaluated for impairment $ 981 $ 262 $ 1,812 $ 605 $ — $ — $ 3,660 Collectively evaluated for impairment 9,738 8,546 6,840 14,167 11,401 — 50,692 Total ending allowance balance $ 10,719 $ 8,808 $ 8,652 $ 14,772 $ 11,401 $ — $ 54,352 Loan Balance: Loans individually evaluated for impairment $ 19,103 $ 21,978 $ 7,690 $ 24,905 $ — $ — $ 73,676 Loans collectively evaluated for impairment 837,432 1,047,659 148,114 1,826,470 893,160 3,171 4,756,006 Total ending loan balance $ 856,535 $ 1,069,637 $ 155,804 $ 1,851,375 $ 893,160 $ 3,171 $ 4,829,682 Allowance for loan losses as a percentage of loan balance: Loans individually evaluated for impairment 5.14 % 1.19 % 23.56 % 2.43 % — % — % 4.97 % Loans collectively evaluated for impairment 1.16 % 0.82 % 4.62 % 0.78 % 1.28 % — % 1.07 % Total 1.25 % 0.82 % 5.55 % 0.80 % 1.28 % — % 1.13 % Recorded Investment: Loans individually evaluated for impairment $ 19,106 $ 21,989 $ 7,687 $ 24,930 $ — $ — $ 73,712 Loans collectively evaluated for impairment 840,647 1,051,194 148,512 1,829,931 896,127 3,188 4,769,599 Total ending recorded investment $ 859,753 $ 1,073,183 $ 156,199 $ 1,854,861 $ 896,127 $ 3,188 $ 4,843,311

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2015
Schedule of Assets Repossessed or Foreclosed, or loans in process of foreclosure [Line Items]
Schedule of Assets Repossessed or Foreclosed, or loans in process of foreclosure [Table Text Block] [Text Block]	The carrying amount of foreclosed properties held at December 31, 2015 and December 31, 2014 are listed below, as well as the recorded investment of loans secured by residential real estate properties for which formal foreclosure proceedings were in process at those dates. (In thousands) December 31, 2015 December 31, 2014 OREO: Commercial real estate $ 8,333 $ 6,352 Construction real estate 7,259 11,281 Residential real estate 3,059 4,972 Total OREO $ 18,651 $ 22,605 Loans in process of foreclosure: Residential real estate $ 2,021 $ 2,807

Premises And Equipment (Tables)

Premises And Equipment (Tables)	12 Months Ended
	Dec. 31, 2015
Property, Plant and Equipment [Abstract]
Schedule of major categories of premises and equipment	The major categories of premises and equipment and accumulated depreciation are summarized as follows: December 31 (In thousands) 2015 2014 Land $ 19,123 $ 17,836 Buildings 74,525 71,002 Equipment, furniture and fixtures 47,839 42,139 Leasehold improvements 3,878 3,439 Total $ 145,365 $ 134,416 Less accumulated depreciation (85,872 ) (78,937 ) Premises and equipment, net $ 59,493 $ 55,479
Schedule of future minimum rental payments under operating leases	The Corporation leases certain premises and equipment accounted for as operating leases. The following is a schedule of the future minimum rental payments required for the next five years under such leases with initial terms in excess of one year: (In thousands) 2016 $ 1,475 2017 1,276 2018 1,104 2019 1,019 2020 394 Thereafter 520 Total $ 5,788

Investment in Qualified Affor46

Investment in Qualified Affordable Housing (Tables)	12 Months Ended
	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Activity in Affordable Housing Program Obligation [Table Text Block]	The following table summarizes the impact of retrospective application to the balance sheet and income statement for all prior periods presented: (In thousands) December 31, 2014 Total assets As previously reported $ 7,003,256 As reported under the new guidance 7,001,199 Retained earnings As previously reported $ 486,541 As reported under the new guidance 484,484 Total equity As previously reported $ 698,598 As reported under the new guidance 696,541 (In thousands) 12 months ended December 31, 2014 12 months ended December 31, 2013 Total other expense As previously reported $ 195,234 $ 188,529 As reported under the new guidance 187,510 181,515 Income tax expense As previously reported $ 28,602 $ 25,131 As reported under the new guidance 36,459 32,503 Net income As previously reported $ 84,090 $ 77,227 As reported under the new guidance 83,957 76,869
Equity Method Investments [Table Text Block]	The table below details the balances of Park’s affordable housing tax credit investments and related unfunded commitments as of December 31, 2015 and 2014. (In thousands) December 31, 2015 December 31, 2014 Affordable housing tax credit investments $ 51,247 $ 48,911 Unfunded commitments 20,311 16,629

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2015
Deposits [Abstract]
Schedule of summary of non-interest bearing and interest bearing deposits	At December 31, 2015 and 2014 , non-interest bearing and interest bearing deposits were as follows: December 31 (In thousands) 2015 2014 Non-interest bearing $ 1,404,032 $ 1,269,296 Interest bearing 3,943,610 3,858,704 Total $ 5,347,642 $ 5,128,000
Schedule of maturities of time deposits	At December 31, 2015 , the maturities of time deposits were as follows: (In thousands) 2016 $ 814,387 2017 221,761 2018 56,744 2019 145,027 2020 52,062 After 5 years 431 Total $ 1,290,412

Repurchase Agreements (Tables)

Repurchase Agreements (Tables)	12 Months Ended
	Dec. 31, 2015
Transfers of Certain Financial Assets Accounted for as Secured Borrowings [Abstract]
Schedule of Assets and Associated Liabilities Accounted for as Secured Borrowings [Table Text Block]	The following table presents the carrying value of Park's repurchase agreements by remaining contractual maturity at December 31, 2015 and December 31, 2014 : December 31, 2015 (In thousands) Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 days 30 - 90 days Greater than 90 days Total U.S. government and agency securities $ 247,618 $ 2,239 $ — $ 304,385 $ 554,242 December 31, 2014 (In thousands) Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 days 30 - 90 days Greater than 90 days Total U.S. government and agency securities $ 268,427 $ 164 $ 4,940 $ 303,449 $ 576,980

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2015
Short-term Debt [Abstract]
Schedule of short-term debt	The outstanding balances for all short-term borrowings as of December 31, 2015 and 2014 and the weighted-average interest rates as of and paid during each of the years then ended were as follows: (In thousands) Repurchase agreements FHLB Advances 2015 Ending balance $ 254,242 $ 140,000 Highest month-end balance 278,324 140,000 Average daily balance 257,622 1,096 Weighted-average interest rate: As of year-end 0.17 % 0.56 % Paid during the year 0.18 % 0.59 % 2014 Ending balance $ 276,980 $ — Highest month-end balance 307,025 — Average daily balance 262,709 561 Weighted-average interest rate: As of year-end 0.18 % — % Paid during the year 0.19 % 0.10 % Short-term borrowings were as follows: December 31 (In thousands) 2015 2014 Securities sold under agreements to repurchase $ 254,242 $ 276,980 FHLB advances 140,000 — Total short-term borrowings $ 394,242 $ 276,980

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Schedule of maturities of long-term debt	Long-term debt is listed below: December 31, 2015 2014 (In thousands) Outstanding Balance Average Rate Outstanding Balance Average Rate Total Federal Home Loan Bank advances by year of maturity: 2015 — — % 51,000 2.00 % 2016 — — % 26,000 0.92 % 2017 50,000 1.25 % 51,000 1.28 % 2018 150,000 2.04 % 125,049 2.11 % 2019 75,000 1.96 % 75,333 1.97 % 2020 25,000 2.14 % 25,462 2.19 % Thereafter 150,000 3.32 % 150,699 3.33 % Total $ 450,000 2.37 % 504,543 2.30 % Total broker repurchase agreements by year of maturity: 2017 300,000 1.75 % 300,000 1.75 % Total $ 300,000 1.75 % $ 300,000 1.75 % Total combined long-term debt by year of maturity: 2015 — — % 51,000 2.00 % 2016 — — % 26,000 0.92 % 2017 350,000 1.68 % 351,000 1.68 % 2018 150,000 2.04 % 125,049 2.11 % 2019 75,000 1.96 % 75,333 1.97 % 2020 25,000 2.14 % 25,462 2.19 % Thereafter 150,000 3.32 % 150,699 3.33 % Total $ 750,000 2.12 % $ 804,543 2.09 % Prepayment penalty (11,895 ) — (17,941 ) — Total long-term debt $ 738,105 2.16 % $ 786,602 2.89 %

Benefit Plans (Tables)

Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Schedule of plan assets and benefit obligation activity	Using an accrual measurement date of December 31, 2015 and 2014 , plan assets and benefit obligation activity for the Pension Plan are listed below: (In thousands) 2015 2014 Change in fair value of plan assets Fair value at beginning of measurement period $ 160,598 $ 152,739 Actual return on plan assets (58 ) 15,511 Benefits paid (7,042 ) (7,652 ) Fair value at end of measurement period $ 153,498 $ 160,598 Change in benefit obligation Projected benefit obligation at beginning of measurement period $ 109,328 $ 89,179 Service cost 5,368 4,331 Interest cost 4,695 4,577 Actuarial (gains) loss (10,104 ) 18,893 Benefits paid (7,042 ) (7,652 ) Projected benefit obligation at the end of measurement period $ 102,245 $ 109,328 Funded status at end of year (fair value of plan assets less benefit obligation) $ 51,253 $ 51,270
Schedule of allocation of plan assets	The asset allocation for the Pension Plan as of each measurement date, by asset category, was as follows: Percentage of Plan Assets Asset category Target Allocation 2015 2014 Equity securities 50% - 100% 85 % 85 % Fixed income and cash equivalents remaining balance 15 % 15 % Total 100 % 100 %
Schedule of assumptions used to determine benefit obligations	The weighted average assumptions used to determine benefit obligations at December 31, 2015 , 2014 and 2013 were as follows: 2015 2014 2013 Discount rate 4.88 % 4.42 % 5.30 % Rate of compensation increase Under age 30 10.00 % 10.00 % 10.00 % Ages 30-39 6.00 % 6.00 % 6.00 % Ages 40 and over 3.00 % 3.00 % 3.00 %
Schedule of estimated future pension benefit Payments	The estimated future pension benefit payments reflecting expected future service for the next ten years are shown below (in thousands): 2016 $ 5,010 2017 5,321 2018 5,800 2019 6,780 2020 7,317 2021-2025 45,831 Total $ 76,059
Schedule of balances of accumulated other comprehensive income loss	The following table shows ending balances of accumulated other comprehensive loss at December 31, 2015 and 2014. (In thousands) 2015 2014 Prior service cost $ — $ (15 ) Net actuarial loss (23,618 ) (22,855 ) Total (23,618 ) (22,870 ) Deferred taxes 8,267 8,005 Accumulated other comprehensive loss $ (15,351 ) $ (14,865 )
Schedule of components of net periodic benefit cost and other amounts recognized in other comprehensive income (loss)	Using an actuarial measurement date of December 31 for 2015 , 2014 and 2013 , components of net periodic benefit cost and other amounts recognized in other comprehensive (loss) income were as follows: (In thousands) 2015 2014 2013 Components of net periodic benefit cost and other amounts recognized in other comprehensive (loss) income Service cost $ (5,368 ) $ (4,331 ) $ (4,817 ) Interest cost (4,695 ) (4,577 ) (4,223 ) Expected return on plan assets 11,420 10,869 9,536 Amortization of prior service cost (15 ) (19 ) (20 ) Recognized net actuarial loss (637 ) — (2,703 ) Net periodic benefit income (cost) $ 705 $ 1,942 $ (2,227 ) Change to net actuarial (loss) gain for the period $ (1,400 ) $ (14,276 ) $ 30,409 Amortization of prior service cost 15 19 20 Amortization of net loss 637 — 2,703 Total recognized in other comprehensive (loss) income (748 ) (14,257 ) 33,132 Total recognized in net benefit cost and other comprehensive (loss) income $ (43 ) $ (12,315 ) $ 30,905
Schedule of assumptions used to determine costs	The weighted average assumptions used to determine net periodic benefit cost for the years ended December 31, 2015 , 2014 and 2013 are listed below: 2015 2014 2013 Discount Rate 4.42 % 5.30 % 4.47 % Rate of compensation increase Under age 30 10.00 % 10.00 % 10.00 % Ages 30-39 6.00 % 6.00 % 6.00 % Ages 40 and over 3.00 % 3.00 % 3.00 % Expected long-term return on plan assets 7.25 % 7.25 % 7.50 %

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Schedule of deferred tax assets and liabilities	Significant components of the Corporation’s deferred tax assets and liabilities are as follows: December 31 (In thousands) 2015 2014 Deferred tax assets: Allowance for loan losses $ 19,773 $ 19,023 Accumulated other comprehensive loss – Pension Plan 8,266 8,005 Accumulated other comprehensive loss – Unrealized losses on securities 157 — Deferred compensation 3,908 3,820 OREO valuation adjustments 2,418 3,984 Net deferred loan fees 1,204 933 Deferred contract bonus 1,031 — Other 4,171 4,338 Total deferred tax assets $ 40,928 $ 40,103 Deferred tax liabilities: Accumulated other comprehensive income – Unrealized gains on securities — 677 Deferred investment income 10,199 10,199 Pension plan 26,205 25,949 Mortgage servicing rights 3,153 3,015 Partnership adjustments 560 865 Other 872 804 Total deferred tax liabilities $ 40,989 $ 41,509 Net deferred tax asset (liability) $ (61 ) $ (1,406 )
Federal and state income taxes	The components of the provision for federal income taxes are shown below: December 31, (In thousands) 2015 2014 2013 Currently payable Federal $ 32,817 $ 33,931 $ 34,435 Deferred Federal (250 ) 2,528 (1,932 ) Total $ 32,567 $ 36,459 $ 32,503
Schedule of income tax rate reconciliation	The following is a reconciliation of income tax expense to the amount computed at the statutory rate of 35% for the years ended December 31, 2015 , 2014 and 2013 . 2015 2014 2013 Statutory federal corporate tax rate 35.0 % 35.0 % 35.0 % Changes in rates resulting from: Tax exempt interest income, net of disallowed interest (0.5 )% (0.5 )% (0.8 )% Bank owned life insurance (1.8 )% (1.4 )% (1.6 )% Investments in qualified affordable housing projects, net of tax benefits (1.9 )% (1.6 )% (1.7 )% Other tax credits (0.9 )% — % — % KSOP dividend deduction (1.0 )% (1.0 )% (1.1 )% Other (0.2 )% (0.2 )% (0.1 )% Effective tax rate 28.7 % 30.3 % 29.7 %
Reconciliation of unrecognized tax benefits	The following is a reconciliation of the beginning and ending amount of unrecognized tax benefits. (In thousands) 2015 2014 2013 January 1 Balance $ 532 $ 518 $ 517 Additions based on tax positions related to the current year 80 76 74 Additions for tax positions of prior years 16 14 4 Reductions for tax positions of prior years — — — Reductions due to statute of limitations (70 ) (76 ) (77 ) December 31 Balance $ 558 $ 532 $ 518

Other Comprehensive Income (L53

Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2015
Other Comprehensive Income (Loss) [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	Other comprehensive income (loss) components, net of tax, are shown in the following table for the years ended December 31, 2015 , 2014 and 2013 . Year ended December 31, (in thousands) Changes in Pension Plan assets and benefit obligations Unrealized gains and losses on available-for-sale securities Total Beginning balance at December 31, 2014 $ (14,865 ) $ 1,257 $ (13,608 ) Other comprehensive (loss) before reclassifications (910 ) (1,549 ) (2,459 ) Amounts reclassified from accumulated other comprehensive loss 424 — 424 Net current period other comprehensive loss (486 ) (1,549 ) (2,035 ) Ending balance at December 31, 2015 $ (15,351 ) $ (292 ) $ (15,643 ) Beginning balance at December 31, 2013 $ (5,598 ) $ (29,821 ) $ (35,419 ) Other comprehensive (loss) gain before reclassifications (9,279 ) 30,325 21,046 Amounts reclassified from accumulated other comprehensive loss 12 753 765 Net current period other comprehensive (loss) income (9,267 ) 31,078 21,811 Ending balance at December 31, 2014 $ (14,865 ) $ 1,257 $ (13,608 ) Beginning balance at December 31, 2012 $ (27,134 ) $ 9,616 $ (17,518 ) Other comprehensive gain (loss) before reclassifications 19,766 (39,448 ) (19,682 ) Amounts reclassified from accumulated other comprehensive loss 1,770 11 1,781 Net current period other comprehensive income (loss) 21,536 (39,437 ) (17,901 ) Ending balance at December 31, 2013 $ (5,598 ) $ (29,821 ) $ (35,419 )
Schedule of components of other comprehensive income (loss)	The following table provides information concerning amounts reclassified out of accumulated other comprehensive loss for the years ended December 31, 2015, 2014 and 2013: Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Affected Line Item in the Statement of Income (In thousands) 2015 2014 2013 Amortization of defined benefit pension items Amortization of prior service cost $ 15 $ 19 $ 20 Employee benefits Amortization of net loss 637 — 2,703 Employee benefits Total income before income taxes 652 19 2,723 Total income before income taxes Federal income taxes 228 7 953 Federal income taxes Net of tax $ 424 $ 12 $ 1,770 Net of tax Unrealized gains & losses on available for sale securities Loss on sale of investment securities $ — $ 1,158 $ — Gain (loss) on sale of investment securities Other than temporary impairment — — 17 Miscellaneous expense Total income before income taxes — 1,158 17 Total income before income taxes Federal income taxes — 405 6 Federal income taxes Net of tax $ — $ 753 $ 11 Net of tax

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2015
Earnings Per Share [Abstract]
Schedule of computation of basic and diluted earnings per common share	The following table sets forth the computation of basic and diluted earnings per common share: Year ended December 31 2015 2014 2013 Numerator: Net income available to common shareholders $ 81,012 $ 83,957 $ 76,869 Denominator: Basic earnings per common share: Weighted-average common shares outstanding 15,364,281 15,394,971 15,412,365 Effect of dilutive securities – performance based restricted stock units 40,459 18,861 — Diluted earnings per common share: Adjusted weighted-average shares and assumed vesting 15,404,740 15,413,832 15,412,365 Earnings per common share: Basic earnings per common share $ 5.27 $ 5.45 $ 4.99 Diluted earnings per common share $ 5.26 $ 5.45 $ 4.99

Financial Instruments With Of55

Financial Instruments With Off-Balance Sheet Risk And Financial Instruments With Concentrations Of Credit Risk (Tables)	12 Months Ended
	Dec. 31, 2015
Risks and Uncertainties [Abstract]
Schedule of off-balance sheet financial instruments with credit risk	The total amounts of off-balance sheet financial instruments with credit risk were as follows: December 31 (In thousands) 2015 2014 Loan commitments $ 888,411 $ 869,793 Standby letters of credit 12,326 12,473

Loan Servicing (Tables)

Loan Servicing (Tables)	12 Months Ended
	Dec. 31, 2015
Transfers and Servicing of Financial Assets [Abstract]
Schedule of servicing assets at amortized value	Activity for mortgage servicing rights and the related valuation allowance follows: December 31 (In thousands) 2015 2014 2013 Mortgage servicing rights: Carrying amount, net, beginning of year $ 8,613 $ 9,013 $ 7,763 Additions 1,748 1,026 2,436 Amortization (1,637 ) (1,631 ) (2,479 ) Change in valuation allowance 284 205 1,293 Carrying amount, net, end of year $ 9,008 $ 8,613 $ 9,013 Valuation allowance: Beginning of year $ 826 $ 1,031 $ 2,324 Change in valuation allowance (284 ) (205 ) (1,293 ) End of year $ 542 $ 826 $ 1,031

Fair Values (Tables)

Fair Values (Tables)	12 Months Ended
	Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Schedule of financial assets and liabilities measured on a recurring basis	The following table presents assets and liabilities measured at fair value on a recurring basis: Fair Value Measurements at December 31, 2015 using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2015 Assets Investment securities: Obligations of U.S. Treasury and other U.S. Government sponsored entities $ — $ 522,063 $ — $ 522,063 U.S. Government sponsored entities’ asset-backed securities — 911,493 — 911,493 Equity securities 1,941 — 769 2,710 Mortgage loans held for sale — 7,306 — 7,306 Mortgage IRLCs — 165 — 165 Liabilities Fair value swap $ — $ — $ 226 $ 226 Fair Value Measurements at December 31, 2014 using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2014 Assets Investment securities: Obligations of U.S. Treasury and other U.S. Government sponsored entities $ — $ 538,064 $ — $ 538,064 U.S. Government sponsored entities’ asset-backed securities — 761,153 — 761,153 Equity securities 1,922 — 776 2,698 Mortgage loans held for sale — 5,264 — 5,264 Mortgage IRLCs — 70 — 70 Liabilities Fair value swap $ — $ — $ 226 $ 226
Schedule of reconciliation of level 3 input for financial instruments measured on recurring basis	The table below is a reconciliation of the beginning and ending balances of the Level 3 inputs for the years ended December 31, 2015 and 2014 , for financial instruments measured on a recurring basis and classified as Level 3: Level 3 Fair Value Measurements (In thousands) Equity Securities Fair Value Swap Balance at January 1, 2015 $ 776 $ (226 ) Total Gains (Losses) Included in earnings - realized — — Included in earnings - unrealized — — Included in other comprehensive loss (7 ) — Purchases, sales, issuances and settlements, other, net — — Re-evaluation of fair value swap — — Balance at December 31, 2015 $ 769 $ (226 ) Balance at January 1, 2014 $ 759 $ (135 ) Total Gains (Losses) Included in earnings - realized — — Included in earnings - unrealized — — Included in other comprehensive income 17 — Purchases, sales, issuances and settlements, other, net — — Re-evaluation of fair value swap — (91 ) Balance at December 31, 2014 $ 776 $ (226 )
Schedule of assets and liabilities measured at fair value on a nonrecurring basis	The following table presents assets and liabilities measured at fair value on a nonrecurring basis: Fair Value Measurements at December 31, 2015 Using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2015 Impaired Loans: Commercial real estate $ — $ — $ 3,698 $ 3,698 Construction real estate: SEPH commercial land and development — — 2,044 2,044 Remaining commercial — — 1,872 1,872 Residential real estate — — 1,882 1,882 Total impaired loans $ — $ — $ 9,496 $ 9,496 Mortgage Servicing Rights $ — $ 1,867 $ — $ 1,867 Other Real Estate Owned: Commercial real estate — — 2,796 2,796 Construction real estate — — 3,387 3,387 Residential real estate — — 2,332 2,332 Total Other Real Estate Owned $ — $ — $ 8,515 $ 8,515 Fair Value Measurements at December 31, 2014 Using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2014 Impaired Loans: Commercial real estate $ — $ — $ 8,481 $ 8,481 Construction real estate: SEPH commercial land and development — — 2,078 2,078 Remaining commercial — — 3,483 3,483 Residential real estate — — 2,921 2,921 Total impaired loans $ — $ — $ 16,963 $ 16,963 Mortgage Servicing Rights $ — $ 2,928 $ — $ 2,928 Other Real Estate Owned: Commercial real estate — — 1,470 1,470 Construction real estate — — 6,473 6,473 Residential real estate — — 2,369 2,369 Total Other Real Estate Owned $ — $ — $ 10,312 $ 10,312
Schedule of qualitative information about Level 3 fair value measurements for financial instruments measured at fair value on a non-recurring basis	The following tables present qualitative information about Level 3 fair value measurements for financial instruments measured at fair value on a non-recurring basis at December 31, 2015 and December 31, 2014 : December 31, 2015 (In thousands) Fair Value Valuation Technique Unobservable Input(s) Range (Weighted Average) Impaired loans: Commercial real estate $ 3,698 Sales comparison approach Adj to comparables 0.0% - 45.9% (20.3%) Income approach Capitalization rate 7.0% - 13.3% (9.5%) Cost approach Accumulated depreciation 50.0% (50.0%) Construction real estate: SEPH commercial land and development $ 2,044 Sales comparison approach Adj to comparables 5.0% - 40.0% (22.1%) Bulk sale approach Discount rate 10.7% (10.7%) Remaining commercial $ 1,872 Sales comparison approach Adj to comparables 0.0% - 25.3% (1.0%) Bulk sale approach Discount rate 10.0% - 10.7% (10.0%) Residential real estate $ 1,882 Sales comparison approach Adj to comparables 0.0% - 96.7% (12.5%) Income approach Capitalization rate 3.8% - 10.1% (9.1%) Cost approach Accumulated depreciation 33.3% - 50.0% (43.4%) Other real estate owned: Commercial real estate $ 2,796 Sales comparison approach Adj to comparables 2.0% - 71.0% (26.9%) Income approach Capitalization rate 9.5% (9.5%) Construction real estate $ 3,387 Sales comparison approach Adj to comparables 0.0% - 85.0% (24.3%) Bulk sale approach Discount rate 15.0% (15.0%) Residential real estate $ 2,332 Sales comparison approach Adj to comparables 0.1% - 61.8% (23.0%) December 31, 2014 (In thousands) Fair Value Valuation Technique Unobservable Input(s) Range (Weighted Average) Impaired loans: Commercial real estate $ 8,481 Sales comparison approach Adj to comparables 0.0% - 84.0% (38.8%) Income approach Capitalization rate 8.0% - 9.5% (9.4%) Cost approach Accumulated depreciation 23.0% (23.0%) Construction real estate: SEPH commercial land and development $ 2,078 Sales comparison approach Adj to comparables 5.0% - 35.0% (17.5%) Bulk sale approach Discount rate 10.8% (10.8%) Remaining commercial $ 3,483 Sales comparison approach Adj to comparables 0.2% - 76.0% (45.4%) Bulk sale approach Discount rate 10.0% - 22.0% (16.5%) Residential real estate $ 2,921 Sales comparison approach Adj to comparables 0.0% - 120.6% (11.1%) Income approach Capitalization rate 7.9% - 10.0% (8.0%) Other real estate owned: Commercial real estate $ 1,470 Sales comparison approach Adj to comparables 0.0% - 87.0% (30.5%) Income approach Capitalization rate 8.4% - 10.0% (9.4%) Cost approach Accumulated depreciation 60.0% - 95.0% (77.5%) Construction real estate $ 6,473 Sales comparison approach Adj to comparables 0.0% - 82.9% (27.1%) Bulk sale approach Discount rate 15.0% (15.0%) Residential real estate $ 2,369 Sales comparison approach Adj to comparables 0.0% - 38.3% (10.1%) Income approach Capitalization rate 6.8% - 7.8% (7.6%)
Fair value, by balance sheet grouping	The fair value of financial instruments at December 31, 2015 and December 31, 2014 , was as follows: December 31, 2015 Fair Value Measurements (In thousands) Carrying value Level 1 Level 2 Level 3 Total fair value Financial assets: Cash and money market instruments $ 149,459 $ 149,459 $ — $ — $ 149,459 Investment securities 1,585,568 1,941 1,584,984 769 1,587,694 Accrued interest receivable - securities 4,436 — 4,436 — 4,436 Accrued interest receivable - loans 14,239 — — 14,239 14,239 Mortgage loans held for sale 7,306 — 7,306 — 7,306 Impaired loans carried at fair value 9,496 — — 9,496 9,496 Mortgage IRLCs 165 — 165 — 165 Other loans 4,994,624 — — 4,997,318 4,997,318 Loans receivable, net $ 5,011,591 $ — $ 7,471 $ 5,006,814 $ 5,014,285 Financial liabilities: Non-interest bearing checking accounts $ 1,404,032 $ 1,404,032 $ — $ — $ 1,404,032 Interest bearing transaction accounts 1,107,200 1,107,200 — — 1,107,200 Savings accounts 1,544,708 1,544,708 — — 1,544,708 Time deposits 1,290,412 — 1,295,329 — 1,295,329 Other 1,290 1,290 — — 1,290 Total deposits $ 5,347,642 $ 4,057,230 $ 1,295,329 $ — $ 5,352,559 Short-term borrowings $ 394,242 $ — $ 394,242 $ — $ 394,242 Long-term debt 738,105 — 771,420 — 771,420 Subordinated notes 45,000 — 41,596 — 41,596 Accrued interest payable – deposits 987 66 921 — 987 Accrued interest payable – debt/borrowings 1,351 4 1,347 — 1,351 Derivative financial instruments: Fair value swap $ 226 $ — $ — $ 226 $ 226 December 31, 2014 Fair Value Measurements (In thousands) Carrying value Level 1 Level 2 Level 3 Total fair value Financial assets: Cash and money market instruments $ 237,699 $ 237,699 $ — $ — $ 237,699 Investment securities 1,442,477 1,922 1,442,708 775 1,445,405 Accrued interest receivable - securities 4,048 — 4,048 — 4,048 Accrued interest receivable - loans 13,629 — — 13,629 13,629 Mortgage loans held for sale 5,264 — 5,264 — 5,264 Impaired loans carried at fair value 16,963 — — 16,963 16,963 Mortgage IRLCs 70 — 70 — 70 Other loans 4,753,033 — — 4,757,461 4,757,461 Loans receivable, net $ 4,775,330 $ — $ 5,334 $ 4,774,424 $ 4,779,758 Financial liabilities: Non-interest bearing checking accounts $ 1,269,296 $ 1,269,296 $ — — $ 1,269,296 Interest bearing transaction accounts 1,122,079 1,122,079 — — 1,122,079 Savings accounts 1,325,445 1,325,445 — — 1,325,445 Time deposits 1,409,911 — 1,422,885 — 1,422,885 Other 1,269 1,269 — — 1,269 Total deposits $ 5,128,000 $ 3,718,089 $ 1,422,885 $ — $ 5,140,974 Short-term borrowings $ 276,980 $ — $ 276,980 $ — $ 276,980 Long-term debt 786,602 — 827,500 — 827,500 Subordinated notes 45,000 — 42,995 — 42,995 Accrued interest payable – deposits 1,125 14 1,111 — 1,125 Accrued interest payable – debt/borrowings 1,426 3 1,423 — 1,426 Derivative financial instruments: Fair value swap $ 226 $ — $ — $ 226 $ 226
Impaired Financing Receivables [Table Text Block]	December 31, 2015 (In thousands) Recorded Investment Prior Charge-Offs Specific Valuation Allowance Carrying Balance Impaired loans recorded at fair value $ 11,783 $ 10,512 $ 2,287 $ 9,496 Remaining impaired loans 68,881 18,193 1,904 66,977 Total impaired loans $ 80,664 $ 28,705 $ 4,191 $ 76,473 December 31, 2014 (In thousands) Recorded Investment Prior Charge-Offs Specific Valuation Allowance Carrying Balance Impaired loans recorded at fair value $ 19,643 $ 19,731 $ 2,680 $ 16,963 Remaining impaired loans 54,069 12,749 980 53,089 Total impaired loans $ 73,712 $ 32,480 $ 3,660 $ 70,052

Capital Ratios (Tables)

Capital Ratios (Tables)	12 Months Ended
	Dec. 31, 2015
Capital [Abstract]
Schedule of compliance with regulatory capital requirements under banking regulations	The following table indicates the capital ratios for PNB and Park at December 31, 2015 and 2014. As of December 31, 2015 Leverage Tier 1 Risk-Based Common Equity Tier 1 Total Risk-Based The Park National Bank 7.06 % 9.83 % 9.83 % 11.37 % Park National Corporation 9.22 % 12.82 % 12.54 % 14.49 % Adequately capitalized ratio 4.00 % 6.00 % 4.50 % 8.00 % Adequately capitalized ratio plus capital conservation buffer 4.00 % 8.50 % 7.00 % 10.50 % Well capitalized ratio (PNB only) 5.00 % 8.00 % 6.50 % 10.00 % As of December 31, 2014 Leverage Tier 1 Risk-Based Common Equity Tier 1 Total Risk-Based The Park National Bank 6.96 % 10.13 % N/A 11.74 % Park National Corporation 9.25 % 13.39 % N/A 15.14 % Adequately capitalized ratio 4.00 % 4.00 % N/A 8.00 % Well capitalized ratio (PNB only) 5.00 % 6.00 % N/A 10.00 %
Schedule of various measures of capital ratio	The following table reflects various measures of capital for Park and PNB: To Be Adequately Capitalized To Be Well Capitalized (In thousands) Actual Amount Ratio Amount Ratio Amount Ratio At December 31, 2015 Total Risk-Based Capital PNB $ 588,467 11.37 % $ 414,079 8.00 % $ 517,599 10.00 % Park 758,988 14.49 % 419,080 8.00 % N/A N/A Tier 1 Risk-Based Capital PNB $ 508,763 9.83 % $ 310,560 6.00 % $ 414,079 8.00 % Park 671,664 12.82 % 314,310 6.00 % N/A N/A Leverage Ratio PNB $ 508,763 7.06 % $ 288,147 4.00 % $ 360,183 5.00 % Park 671,664 9.22 % 291,449 4.00 % N/A N/A Common Equity Tier 1 PNB $ 508,763 9.83 % $ 232,920 4.50 % $ 336,439 6.50 % Park 656,664 12.54 % 235,732 4.50 % N/A N/A At December 31, 2014 Total Risk-Based Capital PNB $ 563,188 11.74 % $ 383,634 8.00 % $ 479,542 10.00 % Park 739,517 15.14 % 390,822 8.00 % N/A N/A Tier 1 Risk-Based Capital PNB $ 485,943 10.13 % $ 191,817 4.00 % $ 287,725 6.00 % Park 654,339 13.39 % 195,411 4.00 % N/A N/A Leverage Ratio PNB $ 485,943 6.96 % $ 279,210 4.00 % $ 349,013 5.00 % Park 654,339 9.25 % 282,992 4.00 % N/A N/A Common Equity Tier 1 PNB N/A N/A N/A N/A N/A N/A Park N/A N/A N/A N/A N/A N/A

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Schedule of operating results by Segment	Segment Information The Corporation is a financial holding company headquartered in Newark, Ohio. The operating segments for the Corporation are its chartered national bank subsidiary, PNB (headquartered in Newark, Ohio), SEPH and GFSC. GAAP requires management to disclose information about the different types of business activities in which a company engages and also information on the different economic environments in which a company operates, so that the users of the financial statements can better understand a company’s performance, better understand the potential for future cash flows, and make more informed judgments about the company as a whole. Park’s current operating segments are in line with GAAP as: (i) discrete financial information is available for each operating segment and (ii) the segments are aligned with internal reporting to Park’s Chief Executive Officer and President, who is the chief operating decision maker. Operating results for the year ended December 31, 2015 (In thousands) PNB GFSC SEPH All Other Total Net interest income (loss) $ 220,879 $ 6,588 $ (74 ) $ 239 $ 227,632 Provision for (recovery of) loan losses 7,665 1,415 (4,090 ) — 4,990 Other income 75,188 2 1,848 513 77,551 Other expense 167,476 2,984 6,182 9,972 186,614 Income (loss) before taxes 120,926 2,191 (318 ) (9,220 ) 113,579 Income taxes (benefit) 36,581 768 (111 ) (4,671 ) 32,567 Net income (loss) $ 84,345 $ 1,423 $ (207 ) $ (4,549 ) $ 81,012 Balances at December 31, 2015 Assets $ 7,229,764 $ 35,793 $ 33,541 $ 12,256 $ 7,311,354 Loans 5,029,072 35,469 15,153 (11,609 ) 5,068,085 Deposits 5,447,293 4,627 — (104,278 ) 5,347,642 Operating results for the year ended December 31, 2014 (In thousands) PNB GFSC SEPH All Other Total Net interest income (loss) $ 218,641 $ 7,457 $ 958 $ (2,012 ) $ 225,044 Provision for (recovery of) loan losses 3,517 1,544 (12,394 ) — (7,333 ) Other income (loss) 69,384 (1 ) 5,991 175 75,549 Other expense 163,641 4,103 11,766 8,000 187,510 Income (loss) before taxes 120,867 1,809 7,577 (9,837 ) 120,416 Income taxes (benefit) 37,960 634 2,652 (4,787 ) 36,459 Net income (loss) $ 82,907 $ 1,175 $ 4,925 $ (5,050 ) $ 83,957 Balances at December 31, 2014 Assets $ 6,910,386 $ 40,308 $ 43,762 $ 6,743 $ 7,001,199 Loans 4,781,761 40,645 23,956 (16,680 ) 4,829,682 Deposits 5,222,766 5,883 — (100,649 ) 5,128,000 Operating results for the year ended December 31, 2013 (In thousands) PNB GFSC SEPH All Other Total Net interest income (loss) $ 210,781 $ 8,741 $ (1,325 ) $ 2,828 $ 221,025 Provision for (recovery of) loan losses 14,039 1,175 (11,799 ) — 3,415 Other income 70,841 11 1,956 469 73,277 Other expense 158,651 3,133 12,211 7,520 181,515 Income (loss) before taxes 108,932 4,444 219 (4,223 ) 109,372 Income taxes (benefit) 33,696 1,556 77 (2,826 ) 32,503 Net income (loss) $ 75,236 $ 2,888 $ 142 $ (1,397 ) $ 76,869 Balances at December 31, 2013 Assets $ 6,522,174 $ 47,115 $ 72,781 $ (5,647 ) $ 6,636,423 Loans 4,559,406 47,228 38,014 (24,143 ) 4,620,505 Deposits 4,896,405 7,159 — (113,570 ) 4,789,994
Schedule of reconciliation of financial information for the reportable segments to the Corporation’s consolidated totals	The following is a reconciliation of financial information for the reportable segments to the Corporation’s consolidated totals: 2015 (In thousands) Net Interest Income Depreciation Expense Other Expense Income Taxes Assets Deposits Totals for reportable segments $ 227,393 $ 7,347 $ 169,295 $ 37,238 $ 7,299,098 $ 5,451,920 Elimination of intersegment items 2,561 — — — (13,557 ) (104,278 ) Parent Co. totals - not eliminated (2,322 ) — 9,972 (4,671 ) 25,813 — Totals $ 227,632 $ 7,347 $ 179,267 $ 32,567 $ 7,311,354 $ 5,347,642 2014 (In thousands) Net Interest Income Depreciation Expense Other Expense Income Taxes Assets Deposits Totals for reportable segments $ 227,056 $ 7,243 $ 172,267 $ 41,246 $ 6,994,456 $ 5,228,649 Elimination of intersegment items 3,708 — — — (18,556 ) (100,649 ) Parent Co. totals - not eliminated (5,720 ) — 8,000 (4,787 ) 25,299 — Totals $ 225,044 $ 7,243 $ 180,267 $ 36,459 $ 7,001,199 $ 5,128,000 2013 (In thousands) Net Interest Income Depreciation Expense Other Expense Income Taxes Assets Deposits Totals for reportable segments $ 218,197 $ 7,315 $ 166,680 $ 35,329 $ 6,642,070 $ 4,903,564 Elimination of intersegment items 8,659 — — — (30,369 ) (113,570 ) Parent Co. totals - not eliminated (5,831 ) — 7,520 (2,826 ) 24,722 — Totals $ 221,025 $ 7,315 $ 174,200 $ 32,503 $ 6,636,423 $ 4,789,994

Parent Company Statements (Tabl

Parent Company Statements (Tables)	12 Months Ended
	Dec. 31, 2015
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Balance Sheets	Balance Sheets December 31, 2015 and 2014 (In thousands) 2015 2014 Assets: Cash $ 102,416 $ 98,671 Investment in subsidiaries 613,383 599,855 Debentures receivable from PNB 25,000 25,000 Other investments 2,341 2,344 Other assets 23,443 23,260 Total assets $ 766,583 $ 749,130 Liabilities: Subordinated notes 45,000 45,000 Other liabilities 8,228 7,589 Total liabilities 53,228 52,589 Total shareholders’ equity 713,355 696,541 Total liabilities and shareholders’ equity $ 766,583 $ 749,130
Statements of Income	Statements of Income for the years ended December 31, 2015, 2014 and 2013 (In thousands) 2015 2014 2013 Income: Dividends from subsidiaries $ 60,000 $ 60,000 $ 15,000 Interest and dividends 2,561 3,708 8,659 Other 560 262 531 Total income 63,121 63,970 24,190 Expense: Other, net 12,341 13,807 13,413 Total expense 12,341 13,807 13,413 Income before federal taxes and equity in undistributed income of subsidiaries 50,780 50,163 10,777 Federal income tax benefit 4,671 4,787 2,826 Income before equity in undistributed income of subsidiaries 55,451 54,950 13,603 Equity in undistributed income of subsidiaries 25,561 29,007 63,266 Net income $ 81,012 $ 83,957 $ 76,869 Other comprehensive (loss) income (1) (2,035 ) 21,811 (17,901 ) Comprehensive income 78,977 105,768 58,968
Statements of Cash Flows	Statements of Cash Flows for the years ended December 31, 2015, 2014 and 2013 (In thousands) 2015 2014 2013 Operating activities: Net income $ 81,012 $ 83,957 $ 76,869 Adjustments to reconcile net income to net cash provided by operating activities: Undistributed income of subsidiaries (25,561 ) (29,007 ) (63,266 ) Compensation expense for issuance of treasury stock to directors 963 801 850 Share-based compensation expense 865 458 — Decrease in other assets (182 ) (1,292 ) (2,215 ) Increase (decrease) in other liabilities 485 298 (2,187 ) Net cash provided by operating activities 57,582 55,215 10,051 Investing activities: Capital contribution in subsidiary — — (45,000 ) Repayment of investments in and advances to subsidiaries 10,000 32,000 101,960 Net cash provided by investing activities 10,000 32,000 56,960 Financing activities: Cash dividends paid (57,776 ) (57,876 ) (57,949 ) Repayment of subordinated notes — (35,250 ) — Repurchase of treasury shares (6,058 ) (2,355 ) (843 ) Cash payment for fractional shares (3 ) (5 ) (3 ) Net cash used in financing activities (63,837 ) (95,486 ) (58,795 ) Increase (decrease) in cash 3,745 (8,271 ) 8,216 Cash at beginning of year 98,671 106,942 98,726 Cash at end of year $ 102,416 $ 98,671 $ 106,942

Summary of Significant Accoun61

Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Accounting Policies [Line Items]
Average required reserve balance	$ 44.2	$ 40.3
Historical loss period used in estimating loan loss reserve	84 months
Reserve coverage period in historical losses	1 year 11 months 26 days	1 year 11 months 22 days
Compensating Balance, Amount	$ 0
Commercial Loan
Accounting Policies [Line Items]
Reserve coverage period in historical losses	2 years 6 months 8 days	2 years 3 months 12 days

Summary of Significant Accoun62

Summary of Significant Accounting Policies - Depreciable Lives of Premises and Equipment (Details)	12 Months Ended
	Dec. 31, 2015
Minimum | Buildings
Property, Plant and Equipment [Line Items]
Premises and equipment, depreciable lives	30 years
Minimum | Equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Premises and equipment, depreciable lives	3 years
Minimum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, depreciable lives	1 year
Maximum | Buildings
Property, Plant and Equipment [Line Items]
Premises and equipment, depreciable lives	30 years
Maximum | Equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Premises and equipment, depreciable lives	12 years
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, depreciable lives	10 years

Goodwill (Details)

Goodwill (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 72,334,000	$ 72,334,000	$ 72,334,000	$ 72,334,000
Amortization of intangibles	0	0	337,000
Goodwill And Finite Lived Intangible Assets	72,334,000	72,334,000	72,334,000	72,671,000
Core deposits
Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets Amortization	0	0	337,000
Other Intangible Assets, Net	$ 0	$ 0	$ 0	$ 337,000

Investment Securities - Narrat

Investment Securities - Narrative (Details)	12 Months Ended
	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Schedule of Investments [Line Items]
Other than Temporary Impairment Losses, Investments	$ 0	$ 0	$ 17,000
Amortized cost of securities available-for-sale	1,436,714,000	1,299,980,000
Securities held-to-maturity, at amortized cost (fair value of $151,428 and $143,490 at December 31, 2015 and 2014, respectively)	149,302,000	140,562,000
Federal home loan bank stock	50,100,000	50,086,000
Federal reserve bank stock	$ 8,200,000	8,226,000
Investment Securities average remaining life	4 years 9 months 14 days
Federal Home Loan Bank (FHLB) advance borrowings	$ 1,072,000,000	1,205,000,000
Money pledged for government and trust department deposits	429,000,000	513,000,000
Money pledged to secure repurchase agreements	622,000,000	664,000,000
Money Pledged as Collateral for FHLB Advance Borrowings	$ 21,000,000	28,000,000
Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 10 Percent of Stockholders' Equity [Table Text Block]	0
Percentage of amount greater than shareholder's equity	10.00%
Held-to-maturity Securities, Sold Security, Cost Basis of Securities Sold	3,056
Held-to-maturity Securities, Sold Security, Realized Gain (Loss)	$ 88,000
Proceeds from sale of investment securities			75,000,000
Available-for-sale Securities, Gross Realized Gains		22,000
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments		$ 1,200,000	$ 0
U.S. Treasury and sponsored entities callable notes
Schedule of Investments [Line Items]
Available-for-sale securities	$ 527,600,000
Securities sold at a gain [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Gross Realized Gains (Losses), Cost Basis (Methodology) of Securities Sold		187,000
Securities sold at a loss [Member]
Schedule of Investments [Line Items]
Available-for-sale Securities, Gross Realized Gains (Losses), Cost Basis (Methodology) of Securities Sold		174.1
U.S. Government sponsored entity asset-backed securities
Schedule of Investments [Line Items]
Asset-backed securities mortgage portfolio, maturity term	15 years
Amortized cost of securities available-for-sale	$ 907,989,000	$ 751,974,000
Securities held-to-maturity, at amortized cost (fair value of $151,428 and $143,490 at December 31, 2015 and 2014, respectively)	101,112,000	$ 140,562,000
Residential mortgage-backed securities
Schedule of Investments [Line Items]
Amortized cost of securities available-for-sale	569,000,000
Securities held-to-maturity, at amortized cost (fair value of $151,428 and $143,490 at December 31, 2015 and 2014, respectively)	0
Collateralized mortgage-backed securities
Schedule of Investments [Line Items]
Amortized cost of securities available-for-sale	339,000,000
Securities held-to-maturity, at amortized cost (fair value of $151,428 and $143,490 at December 31, 2015 and 2014, respectively)	$ 101,100,000
Minimum | U.S. Treasury and sponsored entities callable notes
Schedule of Investments [Line Items]
Available for Sale Securities, Debt Maturities, Term.	1
Maximum | U.S. Treasury and sponsored entities callable notes
Schedule of Investments [Line Items]
Available for Sale Securities, Debt Maturities, Term.	7

Investment Securities - Schedu

Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Securities Available-for-Sale
Amortized Cost	$ 1,436,714	$ 1,299,980
Gross Unrealized/Unrecognized Holding Gains	10,366	15,010
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	10,814	13,075
Estimated Fair Value	1,436,266	1,301,915
Securities Held-to-Maturity
Securities held-to-maturity, at amortized cost (fair value of $151,428 and $143,490 at December 31, 2015 and 2014, respectively)	149,302	140,562
Gross Unrealized/Unrecognized Holding Gains	2,260
Gross Unrealized/Unrecognized Holding Losses	134
Estimated Fair Value	151,428	143,490
Obligations of U.S. Treasury and other U.S. Government sponsored entities
Securities Available-for-Sale
Amortized Cost	527,605	546,886
Gross Unrealized/Unrecognized Holding Gains		11
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	5,542	8,833
Estimated Fair Value	522,063	538,064
Obligations of States and Political Subdivisions
Securities Held-to-Maturity
Securities held-to-maturity, at amortized cost (fair value of $151,428 and $143,490 at December 31, 2015 and 2014, respectively)	48,190
Gross Unrealized/Unrecognized Holding Gains	734
Estimated Fair Value	48,924
U.S. Government sponsored entity asset-backed securities
Securities Available-for-Sale
Amortized Cost	907,989	751,974
Gross Unrealized/Unrecognized Holding Gains	8,776	13,421
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	5,272	4,242
Estimated Fair Value	911,493	761,153
Securities Held-to-Maturity
Securities held-to-maturity, at amortized cost (fair value of $151,428 and $143,490 at December 31, 2015 and 2014, respectively)	101,112	140,562
Gross Unrealized/Unrecognized Holding Gains	1,526	3,088
Gross Unrealized/Unrecognized Holding Losses	134	160
Estimated Fair Value	102,504	143,490
Equity securities
Securities Available-for-Sale
Amortized Cost	1,120	1,120
Gross Unrealized/Unrecognized Holding Gains	1,590	1,578
Estimated Fair Value	$ 2,710	$ 2,698

Investment Securities - Sche66

Investment Securities - Schedule of Unrealized Loss on Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 Months	$ 711,142	$ 193,189
12 Months or Longer	309,633	558,570
Total	1,020,775	751,759
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months	4,893	223
12 Months or Longer	5,921	12,852
Total	10,814	13,075
Obligations of U.S. Treasury and other U.S. Government sponsored entities
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 Months	326,973	119,913
12 Months or Longer	195,090	388,140
Total	522,063	508,053
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months	2,117	87
12 Months or Longer	3,425	8,746
Total	5,542	8,833
U.S. Government sponsored entity asset-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 Months	384,169	73,276
12 Months or Longer	114,543	170,430
Total	498,712	243,706
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months	2,776	136
12 Months or Longer	2,496	4,106
Total	5,272	4,242
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 Months	5,656	8,032
12 Months or Longer	7,792	2,714
Total	13,448	10,746
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months	10	148
12 Months or Longer	124	12
Total	$ 134	$ 160

Investment Securities - Amorti

Investment Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Estimated Fair Value	$ 1,436,266	$ 1,301,915
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	48,190
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	48,924
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]
U.S. Government sponsored entities’ asset-backed securities	149,302	140,562
Obligations of U.S. Treasury and other U.S. Government sponsored entities
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract]
Due one through five years	220,000
Due five through ten years	307,605
Total	527,605
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Due one through five years	219,135
Due five through ten years	302,928
Estimated Fair Value	$ 522,063	538,064
Available for Sale Securities Weighted Avg Yield	1.94%
Available for Sale Securities Debt Maturities After Five Through Ten Years Weighted Avg Yield	2.40%
Available for Sale Securities Debt Maturities After One Through Five Years Weighted Avg Yield	1.29%
Obligations of States and Political Subdivisions
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	$ 48,190
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	48,924
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]
U.S. Government sponsored entities’ asset-backed securities	$ 48,190
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]
Held to Maturity Securities weighted avg yield	4.65%
U.S. Government sponsored entity asset-backed securities
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract]
Total	$ 907,989
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Estimated Fair Value	$ 911,493	761,153
Available for Sale Securities Weighted Avg Yield	2.23%
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]
U.S. Government sponsored entities’ asset-backed securities	$ 101,112	$ 140,562
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]
Held to Maturity Securities weighted avg yield	3.42%

Loans - Narrative (Details)

Loans - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Deferred Income	$ 10,400,000	$ 9,400,000
Deposit Liabilities Reclassified as Loans Receivable	1,700,000	2,300,000
Troubled Debt Restructuring, Classification removed	1,200,000	2,500,000
Partial charge-offs on impaired loans	28,705,000	32,480,000
Allowance for loans individually evaluated for impairment	4,191,000	3,660,000
Recorded investment, related to loans	19,900,000	9,300,000
Loans 90 days past due and still accruing	1,975,000	2,709,000
TDRs included in nonaccrual loan totals	41,100,000	47,500,000
Nonaccrual TDRs considered current	19,100,000	15,700,000
TDRs included in accruing loan totals	25,100,000	16,300,000
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR	2,300,000	1,400,000
Specific reserves related to troubled debt restructuring	2,300,000	2,400,000
Additional specific reserves related to troubled debt restructuring	1,300,000	700,000	$ 1,100,000
Modified substandard commercial loans, total recorded investment	116,000	987,000
Modified substandard consumer loans total recorded investment	16,500,000	19,900,000
Nonaccrual loans not classified as TDRs at prior fiscal year end	800,000	700,000	5,500,000
Recorded investment modified as TDRs	2,854,000	2,009,000	7,379,000
Consumer
Financing Receivable, Recorded Investment [Line Items]
Allowance for loans individually evaluated for impairment	0	0
Loans 90 days past due and still accruing	1,093,000	1,133,000
Executive officers and directors
Financing Receivable, Recorded Investment [Line Items]
Loans due from related party	47,000,000	45,700,000
New loan made to related party	5,800,000	6,000,000
Repayment of loans due from related party	12,900,000	14,100,000
Increase (Decrease) in Customer Advances	7,100,000	6,400,000
Accruing
Financing Receivable, Recorded Investment [Line Items]
Recorded investment modified as TDRs	44,000	314,000	397,000
Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Recorded investment modified as TDRs	2,800,000	1,700,000	$ 7,000,000
Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment [Line Items]
Partial charge-offs on impaired loans	24,200,000	32,400,000
Financing Receivable With Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment [Line Items]
Partial charge-offs on impaired loans	4,500,000	$ 0
Loans receivable | Executive officers and directors
Financing Receivable, Recorded Investment [Line Items]
Loans due from related party	$ 36,000,000

Loans - Composition of Loan Po

Loans - Composition of Loan Portfolio By Class of Loan (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		$ 109,305	$ 106,156
Impaired Financing Receivable, Recorded Investment		80,664	73,712	$ 112,315
Impaired Financing Receivable, Related Allowance		4,191	3,660
Loan Balance		5,068,085	4,829,682
Accrued Interest Receivable		14,239	13,629
Recorded Investment		5,082,324	4,843,311
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		30,595	19,106	20,727
Loan Balance	[1]	955,727	856,535
Accrued Interest Receivable	[1]	3,437	3,218
Recorded Investment	[1]	959,164	859,753
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		18,025	21,989	41,822
Loan Balance	[1]	1,113,603	1,069,637
Accrued Interest Receivable	[1]	4,009	3,546
Recorded Investment	[1]	1,117,612	1,073,183
Construction real estate
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		173,345	155,804
Recorded Investment		173,762	156,199
SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Loan Balance	[1]	2,044	2,195
Accrued Interest Receivable	[1]	0	0
Recorded Investment	[1]	2,044	2,195
Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		4,676	5,609	10,782
Loan Balance		128,046	115,139
Accrued Interest Receivable		321	300
Recorded Investment		128,367	115,439
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		36,722	31,148
Accrued Interest Receivable		75	72
Recorded Investment		36,797	31,220
Installment
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		6,533	7,322
Accrued Interest Receivable		21	23
Recorded Investment		6,554	7,345
Commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		25,324	24,930	33,408
Loan Balance		410,571	417,612
Accrued Interest Receivable		1,014	1,038
Recorded Investment		411,585	418,650
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		1,210,819	1,189,709
Accrued Interest Receivable		1,469	1,548
Recorded Investment		1,212,288	1,191,257
HELOC
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		211,415	216,915
Accrued Interest Receivable		769	803
Recorded Investment		212,184	217,718
Installment
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		22,638	27,139
Accrued Interest Receivable		78	97
Recorded Investment		22,716	27,236
Consumer
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment				$ 799
Loan Balance		967,111	893,160
Accrued Interest Receivable		3,032	2,967
Recorded Investment		970,143	896,127
Leases
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		2,856	3,171
Accrued Interest Receivable		14	17
Recorded Investment		2,870	3,188
Financing Receivable With No Related Allowance Recorded [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		32,583	30,601
Impaired Financing Receivable, Recorded Investment		18,763	17,883
Financing Receivable With No Related Allowance Recorded [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		15,138	27,923
Impaired Financing Receivable, Recorded Investment		14,916	20,696
Financing Receivable With No Related Allowance Recorded [Member] | SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		10,834	11,026
Impaired Financing Receivable, Recorded Investment		2,044	2,078
Financing Receivable With No Related Allowance Recorded [Member] | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		2,506	1,427
Impaired Financing Receivable, Recorded Investment		1,531	391
Financing Receivable With No Related Allowance Recorded [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		23,798	25,822
Impaired Financing Receivable, Recorded Investment		23,480	23,352
Financing Receivable With Related Allowance Recorded [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		16,155	1,251
Impaired Financing Receivable, Recorded Investment		11,832	1,223
Impaired Financing Receivable, Related Allowance		1,904	981
Financing Receivable With Related Allowance Recorded [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		3,195	1,310
Impaired Financing Receivable, Recorded Investment		3,109	1,293
Impaired Financing Receivable, Related Allowance		381	262
Financing Receivable With Related Allowance Recorded [Member] | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		3,145	5,218
Impaired Financing Receivable, Recorded Investment		3,145	5,218
Impaired Financing Receivable, Related Allowance		1,356	1,812
Financing Receivable With Related Allowance Recorded [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		1,951	1,578
Impaired Financing Receivable, Recorded Investment		1,844	1,578
Impaired Financing Receivable, Related Allowance		$ 550	$ 605
[1]	Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class.

Loans - Recorded Investment in

Loans - Recorded Investment in Nonaccrual, Restructured and Loans Past Due 90 Days or More and Accruing (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 80,664	$ 73,712	$ 112,315
Nonaccrual Loans	95,887	100,393
Accruing Troubled Debt Restructurings	25,088	16,332
Loans Past Due 90 Days or More and Accruing	1,975	2,709
Total Nonperforming Loans	122,950	119,434
Impaired Financing Receivable, Average Recorded Investment	70,762	92,614	124,089
Impaired Financing Receivable, Interest Income, Cash Basis Method	1,963	2,678	2,640
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	30,595	19,106	20,727
Nonaccrual Loans	21,676	18,826
Accruing Troubled Debt Restructurings	8,947	297
Loans Past Due 90 Days or More and Accruing	0	229
Total Nonperforming Loans	30,623	19,352
Impaired Financing Receivable, Average Recorded Investment	20,179	19,518	20,523
Impaired Financing Receivable, Interest Income, Cash Basis Method	340	360	412
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	18,025	21,989	41,822
Nonaccrual Loans	15,268	19,299
Accruing Troubled Debt Restructurings	2,757	2,690
Loans Past Due 90 Days or More and Accruing	0	0
Total Nonperforming Loans	18,025	21,989
Impaired Financing Receivable, Average Recorded Investment	17,883	31,945	41,426
Impaired Financing Receivable, Interest Income, Cash Basis Method	550	1,027	1,151
SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	2,044	2,078	4,777
Nonaccrual Loans	2,044	2,078
Accruing Troubled Debt Restructurings	0	0
Loans Past Due 90 Days or More and Accruing	0	0
Total Nonperforming Loans	2,044	2,078
Impaired Financing Receivable, Average Recorded Investment	2,066	3,658	8,723
Impaired Financing Receivable, Interest Income, Cash Basis Method	21	146
Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	4,676	5,609	10,782
Nonaccrual Loans	4,162	5,558
Accruing Troubled Debt Restructurings	514	51
Loans Past Due 90 Days or More and Accruing	0	0
Total Nonperforming Loans	4,676	5,609
Impaired Financing Receivable, Average Recorded Investment	5,666	8,784	17,829
Impaired Financing Receivable, Interest Income, Cash Basis Method	26	61	616
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	7	59
Accruing Troubled Debt Restructurings	110	94
Loans Past Due 90 Days or More and Accruing	0	9
Total Nonperforming Loans	117	162
Installment
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	64	115
Accruing Troubled Debt Restructurings	114	125
Loans Past Due 90 Days or More and Accruing	0	0
Total Nonperforming Loans	178	240
Commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	25,324	24,930	33,408
Nonaccrual Loans	25,063	24,336
Accruing Troubled Debt Restructurings	261	594
Loans Past Due 90 Days or More and Accruing	0	0
Total Nonperforming Loans	25,324	24,930
Impaired Financing Receivable, Average Recorded Investment	24,968	28,306	34,972
Impaired Financing Receivable, Interest Income, Cash Basis Method	1,026	1,084	461
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	20,378	21,869
Accruing Troubled Debt Restructurings	10,143	10,349
Loans Past Due 90 Days or More and Accruing	851	1,329
Total Nonperforming Loans	31,372	33,547
HELOC
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	1,749	1,879
Accruing Troubled Debt Restructurings	873	630
Loans Past Due 90 Days or More and Accruing	27	9
Total Nonperforming Loans	2,649	2,518
Installment
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	1,657	1,743
Accruing Troubled Debt Restructurings	635	779
Loans Past Due 90 Days or More and Accruing	4	0
Total Nonperforming Loans	2,296	2,522
Consumer
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment			799
Nonaccrual Loans	3,819	4,631
Accruing Troubled Debt Restructurings	734	723
Loans Past Due 90 Days or More and Accruing	1,093	1,133
Total Nonperforming Loans	$ 5,646	6,487
Impaired Financing Receivable, Average Recorded Investment		$ 403	$ 616

Loans - Loans Individually and

Loans - Loans Individually and Collectively Evaluated for Impairment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	$ 120,975	$ 116,725
Loans individually evaluated for impairment	80,664	73,712
Loans collectively evaluated for impairment	40,311	43,013
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	30,623	19,123
Loans individually evaluated for impairment	30,595	19,106
Loans collectively evaluated for impairment	28	17
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	18,025	21,989
Loans individually evaluated for impairment	18,025	21,989
Loans collectively evaluated for impairment	0	0
SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	2,044	2,078
Loans individually evaluated for impairment	2,044	2,078
Loans collectively evaluated for impairment	0	0
Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	4,676	5,609
Loans individually evaluated for impairment	4,676	5,609
Loans collectively evaluated for impairment	0	0
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	117	153
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	117	153
Installment
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	178	240
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	178	240
Commercial
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	25,324	24,930
Loans individually evaluated for impairment	25,324	24,930
Loans collectively evaluated for impairment	0	0
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	30,521	32,218
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	30,521	32,218
HELOC
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	2,622	2,509
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	2,622	2,509
Installment
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	2,292	2,522
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	2,292	2,522
Consumer
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	4,553	5,354
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	$ 4,553	$ 5,354

Loans - Loans Individually Eva

Loans - Loans Individually Evaluated for Impairment by Class of Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	$ 109,305	$ 106,156
Recorded investment	80,664	73,712	$ 112,315
Allowance for loan losses allocated	4,191	3,660
Impaired Financing Receivable, Average Recorded Investment	70,762	92,614	124,089
Impaired Financing Receivable, Interest Income, Cash Basis Method	1,963	2,678	2,640
Commercial, financial and agricultural
Financing Receivable, Impaired [Line Items]
Recorded investment	30,595	19,106	20,727
Impaired Financing Receivable, Average Recorded Investment	20,179	19,518	20,523
Impaired Financing Receivable, Interest Income, Cash Basis Method	340	360	412
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded investment	18,025	21,989	41,822
Impaired Financing Receivable, Average Recorded Investment	17,883	31,945	41,426
Impaired Financing Receivable, Interest Income, Cash Basis Method	550	1,027	1,151
Remaining commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	4,676	5,609	10,782
Impaired Financing Receivable, Average Recorded Investment	5,666	8,784	17,829
Impaired Financing Receivable, Interest Income, Cash Basis Method	26	61	616
Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	25,324	24,930	33,408
Impaired Financing Receivable, Average Recorded Investment	24,968	28,306	34,972
Impaired Financing Receivable, Interest Income, Cash Basis Method	1,026	1,084	461
Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment			799
Impaired Financing Receivable, Average Recorded Investment		403	616
Construction Real Estate Vision Commercial Land And Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	2,044	2,078	4,777
Impaired Financing Receivable, Average Recorded Investment	2,066	3,658	$ 8,723
Impaired Financing Receivable, Interest Income, Cash Basis Method	21	146
With no related allowance recorded | Commercial, financial and agricultural
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	32,583	30,601
Recorded investment	18,763	17,883
With no related allowance recorded | Commercial real estate
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	15,138	27,923
Recorded investment	14,916	20,696
With no related allowance recorded | SEPH commercial land and development
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	10,834	11,026
Recorded investment	2,044	2,078
With no related allowance recorded | Remaining commercial
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	2,506	1,427
Recorded investment	1,531	391
With no related allowance recorded | Commercial
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	23,798	25,822
Recorded investment	$ 23,480	$ 23,352

Loans - Average Recorded Inves

Loans - Average Recorded Investment and Interest Income Recognized on Loans Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Recorded investment	$ 80,664	$ 73,712	$ 112,315
Average recorded investment	70,762	92,614	124,089
Interest income recognized	1,963	2,678	2,640
Commercial, financial and agricultural
Financing Receivable, Impaired [Line Items]
Recorded investment	30,595	19,106	20,727
Average recorded investment	20,179	19,518	20,523
Interest income recognized	340	360	412
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded investment	18,025	21,989	41,822
Average recorded investment	17,883	31,945	41,426
Interest income recognized	550	1,027	1,151
SEPH commercial land and development
Financing Receivable, Impaired [Line Items]
Recorded investment	2,044	2,078	4,777
Average recorded investment	2,066	3,658	8,723
Interest income recognized	21	146
Remaining commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	4,676	5,609	10,782
Average recorded investment	5,666	8,784	17,829
Interest income recognized	26	61	616
Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	25,324	24,930	33,408
Average recorded investment	24,968	28,306	34,972
Interest income recognized	$ 1,026	1,084	461
Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment			799
Average recorded investment		$ 403	$ 616

Loans - Aging of Recorded Inve

Loans - Aging of Recorded Investment in Past Due Loans(Details) - USD ($) $ in Thousands		Dec. 31, 2015		Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		$ 24,505		$ 31,074
Past due nonaccrual loans and loans past due 90 days or more and accruing		42,383	[1]	52,932	[2]
Total past due		66,888		84,006
Total current		5,015,436		4,759,305
Recorded Investment		5,082,324		4,843,311
Commercial, financial and agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		670		6,482
Past due nonaccrual loans and loans past due 90 days or more and accruing		7,536	[1]	7,508	[2]
Total past due		8,206		13,990
Total current		950,958		845,763
Recorded Investment	[3]	959,164		859,753
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		142		808
Past due nonaccrual loans and loans past due 90 days or more and accruing		530	[1]	8,288	[2]
Total past due		672		9,096
Total current		1,116,940		1,064,087
Recorded Investment	[3]	1,117,612		1,073,183
Construction real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment		173,762		156,199
SEPH commercial land and development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due nonaccrual loans and loans past due 90 days or more and accruing	[1]	2,044
Total past due		2,044
Recorded Investment		2,044
SEPH commercial land and development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due nonaccrual loans and loans past due 90 days or more and accruing	[2]			2,068
Total past due				2,068
Total current				127
Recorded Investment				2,195
Remaining commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		165		166
Past due nonaccrual loans and loans past due 90 days or more and accruing		84	[1]	77	[2]
Total past due		249		243
Total current		128,118		115,196
Recorded Investment		128,367		115,439
Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		63		39
Past due nonaccrual loans and loans past due 90 days or more and accruing		7	[1]	68	[2]
Total past due		70		107
Total current		36,727		31,113
Recorded Investment		36,797		31,220
Installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		200		21
Past due nonaccrual loans and loans past due 90 days or more and accruing		46	[1]	25	[2]
Total past due		246		46
Total current		6,308		7,299
Recorded Investment		6,554		7,345
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		325		250
Past due nonaccrual loans and loans past due 90 days or more and accruing		19,521	[1]	19,592	[2]
Total past due		19,846		19,842
Total current		391,739		398,808
Recorded Investment		411,585		418,650
Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		10,569		11,146
Past due nonaccrual loans and loans past due 90 days or more and accruing		8,735	[1]	10,637	[2]
Total past due		19,304		21,783
Total current		1,192,984		1,169,474
Recorded Investment		1,212,288		1,191,257
HELOC
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		487		262
Past due nonaccrual loans and loans past due 90 days or more and accruing		186	[1]	387	[2]
Total past due		673		649
Total current		211,511		217,069
Recorded Investment		212,184		217,718
Installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		426		596
Past due nonaccrual loans and loans past due 90 days or more and accruing		318	[1]	464	[2]
Total past due		744		1,060
Total current		21,972		26,176
Recorded Investment		22,716		27,236
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		11,458		11,304
Past due nonaccrual loans and loans past due 90 days or more and accruing		3,376	[1]	3,818	[2]
Total past due		14,834		15,122
Total current		955,309		881,005
Recorded Investment		970,143		896,127
Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total current		2,870		3,188
Recorded Investment		$ 2,870		$ 3,188
[1]	Includes $2.0 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans.
[2]	Includes $2.7 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans.
[3]	Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class.

Loans - Recorded Investment by

Loans - Recorded Investment by Loan Grade (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Five Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	$ 24,703	$ 16,252
Five Rated [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	4,392	1,874
Five Rated [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	14,880	8,448
Five Rated [Member] | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	2,151	3,349
Five Rated [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	3,280	2,581
Six Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	4,272	3,568
Six Rated [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	347	1,201
Six Rated [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	3,417	1,712
Six Rated [Member] | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	122	57
Six Rated [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	386	598
Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	80,692	73,729
Impaired [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	30,623	19,123
Impaired [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	18,025	21,989
Impaired [Member] | SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	2,044
Impaired [Member] | SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Commercial loans		2,078
Impaired [Member] | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	4,676	5,609
Impaired [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	25,324	24,930
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	2,511,975	2,378,859
Pass [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	923,802	837,555
Pass [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	1,081,290	1,041,034
Pass [Member] | SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Commercial loans		117
Pass [Member] | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	121,418	106,424
Pass [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	382,595	390,541
Pass [Member] | Leases
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	2,870	3,188
Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	2,621,642	2,472,408
Recorded Investment [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	959,164	859,753
Recorded Investment [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	1,117,612	1,073,183
Recorded Investment [Member] | SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	2,044
Recorded Investment [Member] | SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Commercial loans		2,195
Recorded Investment [Member] | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	128,367	115,439
Recorded Investment [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	411,585	418,650
Recorded Investment [Member] | Leases
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	$ 2,870	$ 3,188

Loans - TDR Number of Contract

Loans - TDR Number of Contracts Modified And Recorded Investment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)contracts	Dec. 31, 2014USD ($)contracts	Dec. 31, 2013USD ($)contracts
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	424	450	496
Total Recorded Investment Modified as TDRs During Period	$ 23,324	$ 8,395	$ 18,467
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	39	30	34
Total Recorded Investment Modified as TDRs During Period	$ 12,588	$ 723	$ 1,341
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	14	11	22
Total Recorded Investment Modified as TDRs During Period	$ 4,160	$ 2,438	$ 8,563
SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0
SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts		0	0
Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	2	2	3
Total Recorded Investment Modified as TDRs During Period	$ 513	$ 206	$ 98
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	1	0	0
Total Recorded Investment Modified as TDRs During Period	$ 19
Installment
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	2	4
Total Recorded Investment Modified as TDRs During Period		$ 56	$ 51
Commercial
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	11	9	15
Total Recorded Investment Modified as TDRs During Period	$ 1,185	$ 866	$ 2,552
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	39	46	62
Total Recorded Investment Modified as TDRs During Period	$ 3,254	$ 2,357	$ 4,245
HELOC
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	26	10	16
Total Recorded Investment Modified as TDRs During Period	$ 360	$ 326	$ 175
Installment
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	9	10	13
Total Recorded Investment Modified as TDRs During Period	$ 155	$ 121	$ 292
Consumer
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	283	330	327
Total Recorded Investment Modified as TDRs During Period	$ 1,090	$ 1,302	$ 1,150
Accruing
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	11,766	1,946	3,093
Accruing | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	8,948	292	7
Accruing | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	637	1,184
Accruing | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	513
Accruing | Mortgage
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	19	0	0
Accruing | Installment
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	0	0	26
Accruing | Mortgage
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	1,132	32	1,967
Accruing | HELOC
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	315	85	175
Accruing | Installment
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period		109	113
Accruing | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	202	244	805
Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	11,558	6,449	15,374
Nonaccrual | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	3,640	431	1,334
Nonaccrual | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	3,523	1,254	8,563
Nonaccrual | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period		206	98
Nonaccrual | Installment
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period		56	25
Nonaccrual | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	1,185	866	2,552
Nonaccrual | Mortgage
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	2,122	2,325	2,278
Nonaccrual | HELOC
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	45	241	0
Nonaccrual | Installment
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	155	12	179
Nonaccrual | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	$ 888	$ 1,058	$ 345

Loans - Recorded Investment 77

Loans - Recorded Investment in Financing Receivable Modified as TDR Within 12 Month (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)contracts	Dec. 31, 2014USD ($)contracts	Dec. 31, 2013USD ($)contracts
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	67	86	132
Recorded Investment | $	$ 2,854	$ 2,009	$ 7,379
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	1	4	11
Recorded Investment | $	$ 1	$ 206	$ 771
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	1	1	11
Recorded Investment | $	$ 626	$ 302	$ 2,839
SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	0	0	0
Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	0	0	0
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	0	0	0
Recorded Investment | $	$ 0
Installment
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	0	0	1
Recorded Investment | $	$ 0		$ 10
Commercial
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	3	1	4
Recorded Investment | $	$ 1,005	$ 3	$ 1,683
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	12	14	26
Recorded Investment | $	$ 682	$ 810	$ 1,533
HELOC
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	1	2	0
Recorded Investment | $	$ 5	$ 160
Installment
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	2	2	5
Recorded Investment | $	$ 101	$ 12	$ 72
Leases
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	47	62	74
Recorded Investment | $	$ 434	$ 516	$ 471
Leases
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	0	0	0
Recorded Investment | $	$ 0

Allowance for Loan Losses - Al

Allowance for Loan Losses - Allowance Calculation at the Segment Level and Adjusted Beginning Balance for the Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Reserve Estimate Methodology, Historical Loss Period Factor	84 months
Beginning balance	$ 54,352	$ 59,468	$ 55,537
Charge-offs	14,290	24,780	19,153
Recoveries	(11,442)	(26,997)	(19,669)
Net charge-offs (recoveries)	2,848	(2,217)	(516)
(Recovery) Provision	4,990	(7,333)	3,415
Ending balance	56,494	54,352	59,468
Commercial, financial and agricultural
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	10,719	14,218	15,635
Charge-offs	2,478	3,779	6,160
Recoveries	(1,373)	(1,003)	(1,314)
Net charge-offs (recoveries)	1,105	2,776	4,846
(Recovery) Provision	4,080	(723)	3,429
Ending balance	13,694	10,719	14,218
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	8,808	15,899	11,736
Charge-offs	348	8,003	1,832
Recoveries	(2,241)	(7,759)	(726)
Net charge-offs (recoveries)	(1,893)	244	1,106
(Recovery) Provision	(1,504)	(6,847)	5,269
Ending balance	9,197	8,808	15,899
Construction real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	8,652	6,855	6,841
Charge-offs	470	1,316	1,791
Recoveries	(2,092)	(12,572)	(9,378)
Net charge-offs (recoveries)	(1,622)	(11,256)	(7,587)
(Recovery) Provision	(1,710)	(9,459)	(7,573)
Ending balance	8,564	8,652	6,855
Residential real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	14,772	14,251	14,759
Charge-offs	2,352	3,944	3,207
Recoveries	(2,438)	(2,985)	(6,000)
Net charge-offs (recoveries)	(86)	959	(2,793)
(Recovery) Provision	(1,344)	1,480	(3,301)
Ending balance	13,514	14,772	14,251
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	11,401	8,245	6,566
Charge-offs	8,642	7,738	6,163
Recoveries	(3,295)	(2,671)	(2,249)
Net charge-offs (recoveries)	5,347	5,067	3,914
(Recovery) Provision	5,470	8,223	5,593
Ending balance	11,524	11,401	8,245
Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	0	0	0
Charge-offs	0	0	0
Recoveries	(3)	(7)	(2)
Net charge-offs (recoveries)	(3)	(7)	(2)
(Recovery) Provision	(2)	(7)	(2)
Ending balance	$ 1	$ 0	$ 0

Allowance for Loan Losses - Co

Allowance for Loan Losses - Composition of the Allowance for Loan Losses (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance		$ 56,494	$ 54,352	$ 59,468	$ 55,537
Ending allowance balance attributed to loans
Individually evaluated for impairment		4,191	3,660
Collectively evaluated for impairment		52,303	50,692
Total ending allowance balance		56,494	54,352
Loan Balance:
Loans individually evaluated for impairment		80,599	73,676
Loans collectively evaluated for impairment		4,987,486	4,756,006
Total ending loan balance		$ 5,068,085	$ 4,829,682
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment		5.20%	4.97%
Loans collectively evaluated for impairment		1.05%	1.07%
Total		1.11%	1.13%
Recorded Investment:
Loans individually evaluated for impairment		$ 80,664	$ 73,712
Loans collectively evaluated for impairment		5,001,660	4,769,599
Recorded Investment		5,082,324	4,843,311
Financing Receivable, Allowance for Credit Losses, Write-downs		14,290	24,780	19,153
Financing Receivable, Allowance for Credit Losses, Recovery		(11,442)	(26,997)	(19,669)
Financing Receivables Allowance For Credit Losses Net Charge Offs		2,848	(2,217)	(516)
Provision for Loan, Lease, and Other Losses		4,990	(7,333)	3,415
Commercial, financial and agricultural
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance		13,694	10,719	14,218	15,635
Ending allowance balance attributed to loans
Individually evaluated for impairment		1,904	981
Collectively evaluated for impairment		11,790	9,738
Total ending allowance balance		13,694	10,719
Loan Balance:
Loans individually evaluated for impairment		30,545	19,103
Loans collectively evaluated for impairment		925,182	837,432
Total ending loan balance	[1]	$ 955,727	$ 856,535
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment		6.23%	5.14%
Loans collectively evaluated for impairment		1.27%	1.16%
Total		1.43%	1.25%
Recorded Investment:
Loans individually evaluated for impairment		$ 30,595	$ 19,106
Loans collectively evaluated for impairment		928,569	840,647
Recorded Investment	[1]	959,164	859,753
Financing Receivable, Allowance for Credit Losses, Write-downs		2,478	3,779	6,160
Financing Receivable, Allowance for Credit Losses, Recovery		(1,373)	(1,003)	(1,314)
Financing Receivables Allowance For Credit Losses Net Charge Offs		1,105	2,776	4,846
Provision for Loan, Lease, and Other Losses		4,080	(723)	3,429
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance		9,197	8,808	15,899	11,736
Ending allowance balance attributed to loans
Individually evaluated for impairment		381	262
Collectively evaluated for impairment		8,816	8,546
Total ending allowance balance		9,197	8,808
Loan Balance:
Loans individually evaluated for impairment		18,015	21,978
Loans collectively evaluated for impairment		1,095,588	1,047,659
Total ending loan balance	[1]	$ 1,113,603	$ 1,069,637
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment		2.11%	1.19%
Loans collectively evaluated for impairment		0.80%	0.82%
Total		0.83%	0.82%
Recorded Investment:
Loans individually evaluated for impairment		$ 18,025	$ 21,989
Loans collectively evaluated for impairment		1,099,587	1,051,194
Recorded Investment	[1]	1,117,612	1,073,183
Financing Receivable, Allowance for Credit Losses, Write-downs		348	8,003	1,832
Financing Receivable, Allowance for Credit Losses, Recovery		(2,241)	(7,759)	(726)
Financing Receivables Allowance For Credit Losses Net Charge Offs		(1,893)	244	1,106
Provision for Loan, Lease, and Other Losses		(1,504)	(6,847)	5,269
Construction real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance		8,564	8,652	6,855	6,841
Ending allowance balance attributed to loans
Individually evaluated for impairment		1,356	1,812
Collectively evaluated for impairment		7,208	6,840
Total ending allowance balance		8,564	8,652
Loan Balance:
Loans individually evaluated for impairment		6,716	7,690
Loans collectively evaluated for impairment		166,629	148,114
Total ending loan balance		$ 173,345	$ 155,804
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment		20.19%	23.56%
Loans collectively evaluated for impairment		4.33%	4.62%
Total		4.94%	5.55%
Recorded Investment:
Loans individually evaluated for impairment		$ 6,720	$ 7,687
Loans collectively evaluated for impairment		167,042	148,512
Recorded Investment		173,762	156,199
Financing Receivable, Allowance for Credit Losses, Write-downs		470	1,316	1,791
Financing Receivable, Allowance for Credit Losses, Recovery		(2,092)	(12,572)	(9,378)
Financing Receivables Allowance For Credit Losses Net Charge Offs		(1,622)	(11,256)	(7,587)
Provision for Loan, Lease, and Other Losses		(1,710)	(9,459)	(7,573)
Residential real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance		13,514	14,772	14,251	14,759
Ending allowance balance attributed to loans
Individually evaluated for impairment		550	605
Collectively evaluated for impairment		12,964	14,167
Total ending allowance balance		13,514	14,772
Loan Balance:
Loans individually evaluated for impairment		25,323	24,905
Loans collectively evaluated for impairment		1,830,120	1,826,470
Total ending loan balance		$ 1,855,443	$ 1,851,375
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment		2.17%	2.43%
Loans collectively evaluated for impairment		0.71%	0.78%
Total		0.73%	0.80%
Recorded Investment:
Loans individually evaluated for impairment		$ 25,324	$ 24,930
Loans collectively evaluated for impairment		1,833,449	1,829,931
Recorded Investment		1,858,773	1,854,861
Financing Receivable, Allowance for Credit Losses, Write-downs		2,352	3,944	3,207
Financing Receivable, Allowance for Credit Losses, Recovery		(2,438)	(2,985)	(6,000)
Financing Receivables Allowance For Credit Losses Net Charge Offs		(86)	959	(2,793)
Provision for Loan, Lease, and Other Losses		(1,344)	1,480	(3,301)
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance		11,524	11,401	8,245	6,566
Ending allowance balance attributed to loans
Individually evaluated for impairment		0	0
Collectively evaluated for impairment		11,524	11,401
Total ending allowance balance		11,524	11,401
Loan Balance:
Loans individually evaluated for impairment		0	0
Loans collectively evaluated for impairment		967,111	893,160
Total ending loan balance		$ 967,111	$ 893,160
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment		0.00%	0.00%
Loans collectively evaluated for impairment		1.19%	1.28%
Total		1.19%	1.28%
Recorded Investment:
Loans individually evaluated for impairment		$ 0	$ 0
Loans collectively evaluated for impairment		970,143	896,127
Recorded Investment		970,143	896,127
Financing Receivable, Allowance for Credit Losses, Write-downs		8,642	7,738	6,163
Financing Receivable, Allowance for Credit Losses, Recovery		(3,295)	(2,671)	(2,249)
Financing Receivables Allowance For Credit Losses Net Charge Offs		5,347	5,067	3,914
Provision for Loan, Lease, and Other Losses		5,470	8,223	5,593
Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance		1	0	0	$ 0
Ending allowance balance attributed to loans
Individually evaluated for impairment		0	0
Collectively evaluated for impairment		1	0
Total ending allowance balance		1	0
Loan Balance:
Loans individually evaluated for impairment		0	0
Loans collectively evaluated for impairment		2,856	3,171
Total ending loan balance		$ 2,856	$ 3,171
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment		0.00%	0.00%
Loans collectively evaluated for impairment		0.04%	0.00%
Total		0.04%	0.00%
Recorded Investment:
Loans individually evaluated for impairment		$ 0	$ 0
Loans collectively evaluated for impairment		2,870	3,188
Recorded Investment		2,870	3,188
Financing Receivable, Allowance for Credit Losses, Write-downs		0	0	0
Financing Receivable, Allowance for Credit Losses, Recovery		(3)	(7)	(2)
Financing Receivables Allowance For Credit Losses Net Charge Offs		(3)	(7)	(2)
Provision for Loan, Lease, and Other Losses		$ (2)	$ (7)	$ (2)
[1]	Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class.

Loans Held for Sale Narrative (

Loans Held for Sale Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2014
Loans Held for Sale [Line Items]
Disposal Group, Including Discontinued Operation, Mortgage Loans	$ 7,306,000	$ 5,264,000
Loans Held-for-sale, Mortgages, Contractual Balance	7,200,000	5,200,000
Expected Gain (Loss) on Sale of Mortgage Loans	95,000	80,000
Commercial Portfolio Segment [Member]
Loans Held for Sale [Line Items]
Loans held for sale - lower of cost or market	100,000		$ 22,000,000
Gain (Loss) on Sale of Loans and Leases	$ 800,000	$ 1,900,000

Other Real Estate Owned (Detail

Other Real Estate Owned (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Assets Repossessed or Foreclosed, or loans in process of foreclosure [Line Items]
Other Real Estate, Foreclosed Assets, and Repossessed Assets	$ 18,651	$ 22,605
Construction real estate
Schedule of Assets Repossessed or Foreclosed, or loans in process of foreclosure [Line Items]
Other Real Estate, Foreclosed Assets, and Repossessed Assets	7,259	11,281
Commercial Real Estate [Member]
Schedule of Assets Repossessed or Foreclosed, or loans in process of foreclosure [Line Items]
Other Real Estate, Foreclosed Assets, and Repossessed Assets	8,333	6,352
Residential real estate
Schedule of Assets Repossessed or Foreclosed, or loans in process of foreclosure [Line Items]
Other Real Estate, Foreclosed Assets, and Repossessed Assets	3,059	4,972
Mortgage Loans in Process of Foreclosure, Amount	$ 2,021	$ 2,807

Premises And Equipment - Narra

Premises And Equipment - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$ 7.3	$ 7.2	$ 7.3
Rent expense	$ 1.7	$ 1.7	$ 1.8

Premises And Equipment - Major

Premises And Equipment - Major Categories of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Premises and Equipment, Gross	$ 145,365	$ 134,416
Less accumulated depreciation	(85,872)	(78,937)
Premises and equipment, net	59,493	55,479
Land
Property, Plant and Equipment [Line Items]
Premises and Equipment, Gross	19,123	17,836
Buildings
Property, Plant and Equipment [Line Items]
Premises and Equipment, Gross	74,525	71,002
Equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Premises and Equipment, Gross	47,839	42,139
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and Equipment, Gross	$ 3,878	$ 3,439

Premises And Equipment - Schedu

Premises And Equipment - Schedule of Future Minimum Rental Payments Under Operating Leases (Details) $ in Thousands	Dec. 31, 2015USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2,014	$ 1,475
2,015	1,276
2,016	1,104
2,017	1,019
2,018	394
Thereafter	520
Total	$ 5,788

Investment in Qualified Affor85

Investment in Qualified Affordable Housing (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other expense	$ 186,614	$ 187,510	$ 181,515
Assets	7,311,354	7,001,199	6,636,423
Amortization Method Qualified Affordable Housing Project Investments, Amortization	6,700	6,900
Affordable Housing Tax Credits and Other Tax Benefits, Amount	8,900	8,800
Affordable Housing Program Obligation	20,311	16,629
Retained earnings	507,505	484,484
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	713,355	696,541	649,823	$ 650,366
Income Tax Expense (Benefit)	32,567	36,459	32,503
Net income	81,012	83,957	76,869
Qualified Affordable Housing [Domain]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity investments	51,247	48,911
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	507,505	484,484	458,719	$ 441,605
Net income	$ 81,012	83,957	76,869
Accounting Standards Update 2014-01 [Member] | Assets [Member] | Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Assets		7,001,199
Accounting Standards Update 2014-01 [Member] | Assets [Member] | Scenario, Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Assets		7,003,256
Accounting Standards Update 2014-01 [Member] | Retained Earnings | Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		484,484
Accounting Standards Update 2014-01 [Member] | Retained Earnings | Scenario, Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Retained earnings		486,541
Accounting Standards Update 2014-01 [Member] | Equity [Member] | Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		696,541
Accounting Standards Update 2014-01 [Member] | Equity [Member] | Scenario, Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		698,598
Net Income [Domain] | Accounting Standards Update 2014-01 [Member] | Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income		83,957	76,869
Net Income [Domain] | Accounting Standards Update 2014-01 [Member] | Scenario, Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net income		84,090	77,227
Income Tax Expense [Member] | Accounting Standards Update 2014-01 [Member] | Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income Tax Expense (Benefit)		36,459	32,503
Income Tax Expense [Member] | Accounting Standards Update 2014-01 [Member] | Scenario, Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income Tax Expense (Benefit)		28,602	25,131
Other Expense [Member] | Accounting Standards Update 2014-01 [Member] | Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other expense		187,510	181,515
Other Expense [Member] | Accounting Standards Update 2014-01 [Member] | Scenario, Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other expense		$ 195,234	$ 188,529

Deposits - Narrative (Details)

Deposits - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Deposits [Abstract]
Deposits received from executive officers, directors, and their related interests	$ 21.6	$ 21.9
Time Deposits, $250,000 or more	$ 49.7	$ 64.7

Deposits - Summary of Noninter

Deposits - Summary of Noninterest Bearing and Interest Bearing Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deposits [Abstract]
Non-interest bearing	$ 1,404,032	$ 1,269,296
Interest bearing	3,943,610	3,858,704
Total deposits	$ 5,347,642	$ 5,128,000	$ 4,789,994

Deposits - Time Deposits (Deta

Deposits - Time Deposits (Details) $ in Thousands	Dec. 31, 2015USD ($)
Time Deposits, Fiscal Year Maturity [Abstract]
2,013	$ 814,387
2,014	221,761
2,015	56,744
2,016	145,027
2,017	52,062
After 5 years	431
Total	$ 1,290,412

Deposits - Maturities of Time

Deposits - Maturities of Time Deposits (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Time Deposits, $250,000 or more	$ 49.7	$ 64.7

Repurchase Agreements (Details)

Repurchase Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Nov. 30, 2012
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
ERROR in label resolution.	$ 585,000	$ 347,000
Pledged Assets Separately Reported, Securities Pledged for Repurchase Agreements, at Fair Value	622,000	664,000
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	554,242	576,980
Maturity Greater than 90 Days [Member]
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	304,385	303,449
Maturity 30 to 90 Days [Member]
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	0	4,940
Maturity Less than 30 Days [Member]
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	2,239	164
Maturity Overnight [Member]
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	$ 247,618	$ 268,427
Long-term Debt [Member]
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount			$ 300,000

Short-Term Borrowings - Narrat

Short-Term Borrowings - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Short-term Debt [Line Items]
Money Pledged as Collateral for FHLB Advance Borrowings	$ 21	$ 28
FHLB Advances
Short-term Debt [Line Items]
Commercial real estate and residential mortgage loans pledged under blanket agreement	$ 1,985	$ 2,038

Short-Term Borrowings - Schedu

Short-Term Borrowings - Schedule of Short-Term Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Short-term Debt [Line Items]
Securities sold under agreements to repurchase	$ 254,242	$ 276,980
FHLB advances	140,000	0
Total short-term borrowings	394,242	276,980
Repurchase agreements
Short-term Debt [Line Items]
Total short-term borrowings	254,242	276,980
Highest month-end balance	278,324	307,025
Average daily balance	$ 257,622	$ 262,709
Weighted-average interest rate:
As of year-end	0.17%	0.18%
Paid during the year	0.18%	0.19%
FHLB Advances
Short-term Debt [Line Items]
Total short-term borrowings	$ 140,000	$ 0
Highest month-end balance	140,000	0
Average daily balance	$ 1,096	$ 561
Weighted-average interest rate:
As of year-end	0.56%	0.00%
Paid during the year	0.59%	0.10%

Long-Term Debt - Narrative (De

Long-Term Debt - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Nov. 30, 2012
Debt Instrument [Line Items]
Gains (Losses) on Restructuring of Debt	$ 500	$ 3,200
prepayment penalty amount remaining to amortize	2,100
Amortization of prepayment penalty on long term debt	6,047	5,031	$ 4,835
Prepayment Penalty, Future Amortization Expense [Abstract]
Prepayment penalty	11,895	17,941
Long-term debt with contractual maturity longer than five years	150,000	150,699
Money Pledged as Collateral for FHLB Advance Borrowings	21,000	28,000
FHLB Debt Prepaid	$ 54,500
FHLB Debt Prepaid Weighted Avg Rate	1.59%
FHLB Debt Amount Restructured		$ 50,000
Broker Repurchase Agreements
Debt Instrument [Line Items]
Debt repurchased during period				$ 300,000
Debt repurchased during period, rate				1.75%
Total prepayment penalty	$ 25,000
Effective interest rate percentage	3.55%
Prepayment Penalty, Future Amortization Expense [Abstract]
Prepayment penalty	$ 9,800
Payments of Debt Extinguishment Costs, Amount to be Amortized in Year Two	5,100
Payments of Debt Extinguishment Costs, Amount to be Amortized in Year Three	$ 4,700
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]
Debt Instrument [Line Items]
Debt repurchased during period, rate				1.25%
Effective interest rate percentage	3.52%
Prepayment Penalty, Future Amortization Expense [Abstract]
Payments of Debt Extinguishment Costs, Amount to be Amortized in Year Two	$ 1,100
Payments of Debt Extinguishment Costs, Amount to be Amortized in Year Three	$ 1,000

Long-Term Debt - Schedule of l

Long-Term Debt - Schedule of long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Long-term Debt, Fiscal Year Maturity [Abstract]
2,015	$ 0	$ 51,000
2,016	350,000	26,000
2,017	150,000	351,000
2,018	75,000	125,049
2,019	25,000	75,333
2,020		25,462
Thereafter	150,000	150,699
Total long-term debt, excluding prepayment penalty	750,000	804,543
Prepayment penalty	(11,895)	(17,941)
Total long-term debt	$ 738,105	$ 786,602
Long-term Debt, Fiscal Year Maturity, Average Rate [Abstract] [Abstract]
2,015	0.00%	2.00%
2,016	1.68%	0.92%
2,017	2.04%	1.68%
2,018	1.96%	2.11%
2,019	2.14%	1.97%
2,020		2.19%
Long-term Debt, Maturities, Repayments of Principal after Year Five	$ 150,000
Thereafter		3.33%
Average rate, total, excluding prepayment penalty	2.12%	2.09%
Average rate, total	2.16%	2.89%
Long Term Debt Maturities Average Rate In After Year Five	3.32%
FHLB Advances
Long-term Debt, Fiscal Year Maturity [Abstract]
2,015	$ 0	$ 51,000
2,016	50,000	26,000
2,017	150,000	51,000
2,018	75,000	125,049
2,019	25,000	75,333
2,020		25,462
Thereafter		150,699
Total long-term debt, excluding prepayment penalty	$ 450,000	$ 504,543
Long-term Debt, Fiscal Year Maturity, Average Rate [Abstract] [Abstract]
2,015	0.00%	2.00%
2,016	1.25%	0.92%
2,017	2.04%	1.28%
2,018	1.96%	2.11%
2,019	2.14%	1.97%
2,020		2.19%
Long-term Debt, Maturities, Repayments of Principal after Year Five	$ 150,000
Thereafter		3.33%
Average rate, total, excluding prepayment penalty	2.37%	2.30%
Long Term Debt Maturities Average Rate In After Year Five	3.32%
Broker Repurchase Agreements
Long-term Debt, Fiscal Year Maturity [Abstract]
2,017	$ 300,000
2,018		$ 300,000
Total long-term debt, excluding prepayment penalty	300,000	$ 300,000
Prepayment penalty	$ (9,800)
Long-term Debt, Fiscal Year Maturity, Average Rate [Abstract] [Abstract]
2,017	1.75%
2,018		1.75%
Average rate, total, excluding prepayment penalty	1.75%	1.75%

Subordinated Debentures_Notes (

Subordinated Debentures/Notes (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Apr. 20, 2012USD ($)purchaser	Dec. 23, 2009purchaser
Subordinated notes	$ 45,000	$ 45,000
Number of purchasers | purchaser				38
Trust I
Preferred securities issued	15,000
Junior subordinated notes
Junior subordinated debt purchased by Trust I	$ 15,500
Trust preferred securities
Variable rate basis	three-month LIBOR plus 148 basis points
Basis spread on variable rate (percent)	1.48%
Subordinated note
Subordinated notes principal amount	$ 35,250
Portion of principal amount purchased by related parties	$ 14,050
Interest rate	10.00%
Subordinated debt | 7% Subordinated notes due April 20, 2022
Subordinated borrowing, number of purchasers | purchaser			56
Aggregate principal amount			$ 30,000
Interest rate	7.00%
Purchase price as a percentage of principal amount			100.00%
Repurchase amount as a percentage of principal			100.00%

Share-Based Compensation - Nar

Share-Based Compensation - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock Reissued Shares For Director Grants		10,150	10,200	10,550
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost		$ 963,000	$ 801,000	$ 850,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period		200
Allocated Share-based Compensation Expense		$ 865,000	$ 458,000
2013 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares authorized for delivery upon the exercise of incentive stock options		600,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease)		524,100
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		23,025	21,975
Allocated Share-based Compensation Expense		$ 458,000	$ 865,000	$ 0
Common Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock Reissued Shares For Director Grants		10,150	10,200	10,550
Allocated Share-based Compensation Expense		$ 865,000	$ 458,000
2015 Awards [Member] [Member] | Scenario, Forecast [Member] | 2013 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 1,208,000
2014 Awards [Member] | Scenario, Forecast [Member] | 2013 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 734,000

Benefit Plans - Narrative (Det

Benefit Plans - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Nov. 17, 2009
Defined Benefit Plan Disclosure [Line Items]
Company contributions		$ 0	$ 0
Accumulated benefit obligation for the pension plan		$ 86,100,000	$ 92,000,000
Common share purchased under pension plan, shares					115,800
Common share purchased under pension plan, value					$ 7,000,000
Common share purchased under pension plan, value per share					$ 60.45
Fair value, pension plan common shares held, shares		115,800	115,800
Fair value of common shares held by pension plan		$ 10,500,000	$ 10,200,000
Fair value of common shares held by pension plan, per share		$ 90.48	$ 88.48
Estimated net actuarial (loss) expected to be recognized in the next fiscal year		$ (637,000)	$ 0	$ (2,703,000)
Expected long-term return on plan assets		7.25%	7.25%	7.50%
Cash balance in bank		$ 700,000
Market value of pension plan assets		153,500,000	$ 160,600,000
Defined Contribution Plan, Cost Recognized		1,200,000	$ 1,100,000	$ 1,100,000
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Estimated prior service costs expected to be recognized in net periodic benefit cost during next fiscal year		$ 0
S&P 500 Index
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets		7.25%	7.25%
Supplemental Executive Retirement Plan (SERP)
Defined Benefit Plan Disclosure [Line Items]
Benefit expense		$ 1,100,000	$ 1,500,000	$ 0
Accrued benefit cost		8,000,000	7,600,000
Level 1
Defined Benefit Plan Disclosure [Line Items]
Equity investments		135,000,000	141,100,000
Level 2
Defined Benefit Plan Disclosure [Line Items]
Equity investments		18,500,000	19,500,000
Level 3
Defined Benefit Plan Disclosure [Line Items]
Equity investments		$ 0	$ 0
Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated net actuarial (loss) expected to be recognized in the next fiscal year	$ 773,000

Benefit Plans - Plan Assets an

Benefit Plans - Plan Assets and Benefit Obligation Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Change in fair value of plan assets
Fair value at beginning of measurement period	$ 160,598	$ 152,739
Actual return on plan assets	(58)	15,511
Benefits paid	(7,042)	(7,652)
Fair value at end of measurement period	153,498	160,598	$ 152,739
Change in benefit obligation
Projected benefit obligation at beginning of measurement period	109,328	89,179
Service cost	5,368	4,331	4,817
Interest cost	4,695	4,577	4,223
Actuarial (gains) loss	(10,104)	18,893
Benefits paid	(7,042)	(7,652)
Projected benefit obligation at the end of measurement period	102,245	109,328	$ 89,179
Funded status at end of year (fair value of plan assets less benefit obligation)	$ 51,253	$ 51,270

Benefit Plans - Asset Allocati

Benefit Plans - Asset Allocation for the Pension Plan by Asset Category (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 0	$ 0
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual Plan Asset Allocations	100.00%	100.00%
Equity securities
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual Plan Asset Allocations	85.00%	85.00%
Fixed income and cash equivalents
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual Plan Asset Allocations	15.00%	15.00%
S&P 500 Index
Defined Benefit Plan, Information about Plan Assets [Abstract]
Defined Benefit Plan, Expected Return on Plan Assets, Percentage	7.25%	7.25%

Benefit Plans - Weighted Avera

Benefit Plans - Weighted Average Assumptions Used to Determine Benefit Obligations (Details)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.88%	4.42%	5.30%
Rate of compensation increase
Under age 30 [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	10.00%	10.00%	10.00%
Ages 30-39 [Member] [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	6.00%	6.00%	6.00%
Ages 40 and over [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	3.00%	3.00%	3.00%

Benefit Plans - Estimated Futu

Benefit Plans - Estimated Future Pension Benefit Payments (Details) $ in Thousands	Dec. 31, 2015USD ($)
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
2,013	$ 5,010
2,014	5,321
2,015	5,800
2,016	6,780
2,017	7,317
2018-2022	45,831
Total	$ 76,059

Benefit Plans - Balances of Ac

Benefit Plans - Balances of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Prior service cost	$ 0	$ 15
Net actuarial loss	(23,618)	(22,855)
Total	(23,618)	(22,870)
Deferred taxes	(8,267)	(8,005)
Accumulated other comprehensive loss	$ (15,351)	$ (14,865)

Benefit Plans - Components of

Benefit Plans - Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Components of net periodic benefit cost
Service cost	$ (5,368,000)	$ (4,331,000)	$ (4,817,000)
Interest cost	(4,695,000)	(4,577,000)	(4,223,000)
Expected return on plan assets	11,420,000	10,869,000	9,536,000
Net periodic benefit income (cost)	(705,000)	(1,942,000)	2,227,000
Other amounts recognized in other comprehensive (Loss)
Change to net actuarial (loss) gain for the period	(1,400,000)	(14,276,000)	30,409,000
Amortization of prior service cost	(15,000)	(19,000)	(20,000)
Defined Benefit Plan, Future Amortization of Gain (Loss)	(637,000)	0	(2,703,000)
Amortization of net loss	637,000	0	2,703,000
Total recognized in other comprehensive (loss) income	(748,000)	(14,257,000)	33,132,000
Total recognized in net benefit cost and other comprehensive (loss) income	$ (43,000)	$ (12,315,000)	$ 30,905,000

Benefit Plans - Weighted Av104

Benefit Plans - Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate	4.42%	5.30%	4.47%
Rate of compensation increase
Expected long-term return on plan assets	7.25%	7.25%	7.50%

Income Taxes - Components of D

Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Allowance for loan losses	$ 19,773	$ 19,023
Accumulated other comprehensive loss – Pension Plan	8,266	8,005
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross	157	0
Deferred compensation	3,908	3,820
OREO valuation adjustments	2,418	3,984
Deferred Tax Assets, Deferred Income	1,204	933
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other	1,031	0
Other	4,171	4,338
Total deferred tax assets	40,928	40,103
Deferred tax liabilities:
Accumulated other comprehensive income – Unrealized gains on securities	0	677
Deferred investment income	10,199	10,199
Pension plan	26,205	25,949
Mortgage servicing rights	3,153	3,015
Deferred Tax Liabilities, Partnership Adjustments	560	865
Other	872	804
Total deferred tax liabilities	40,989	41,509
Net deferred tax asset (liability)	$ (61)	$ (1,406)

Income Taxes - Components of t

Income Taxes - Components of the Provision for Federal and State Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Currently payable
Federal	$ 32,817	$ 33,931	$ 34,435
Deferred
Federal	(250)	2,528	(1,932)
Total	$ 32,567	$ 36,459	$ 32,503

Income Taxes - Reconciliation

Income Taxes - Reconciliation of Federal Income Tax Expense (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income Tax Examination, Penalties and Interest Expense	$ 2,000		$ (500)
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory federal corporate tax rate	35.00%	35.00%	35.00%
Changes in rates resulting from:
Tax exempt interest income, net of disallowed interest	(0.50%)	(0.50%)	(0.80%)
Bank owned life insurance	(1.80%)	(1.40%)	(1.60%)
Effective Income Tax Rate Reconciliation, Investment in Qualified Affordable Housing, Percent	(1.90%)	(1.60%)	(1.70%)
Investments in qualified affordable housing projects, net of tax benefits	(0.90%)	(0.00%)	(0.00%)
Effective Income Tax Rate Reconciliation, Deduction, Employee Stock Ownership Plan Dividend, Percent	(1.00%)	(1.00%)	(1.10%)
Other	(0.20%)	(0.20%)	(0.10%)
Effective tax rate	28.70%	30.30%	29.70%

Income Taxes - Reconciliati108

Income Taxes - Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 432,000	$ 413,000	$ 403,000
Income Tax Examination, Penalties and Interest Expense	2,000		(500)
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
January 1 Balance	532,000	518,000	517,000
Additions based on tax positions related to the current year	80,000	76,000	74,000
Additions for tax positions of prior years	16,000	14,000	4,000
Reductions for tax positions of prior years	0	0	0
Reductions due to statute of limitations	(70,000)	(76,000)	(77,000)
December 31 Balance	558,000	532,000	518,000
Income Tax Examination, Penalties and Interest Accrued	$ 69,000	$ 67,000	$ 67,000

Other Comprehensive Income (109

Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	$ 652	$ 19	$ 2,723
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax	228	7	953
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	15,351	(14,865)	(5,598)	$ 27,134
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(292)	1,257	(29,821)	9,616
Accumulated Other Comprehensive Income (Loss), Net of Tax	(15,643)	(13,608)	(35,419)	$ (17,518)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(486)	(9,267)	21,536
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(1,549)	31,078	(39,437)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	(910)	(9,279)	19,766
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax	(1,549)	30,325	(39,448)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(2,459)	21,046	(19,682)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax	424	12	1,770
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	424	765	1,781
Other Comprehensive Income (Loss), Net of Tax	(2,035)	21,811	(17,901)
Gain (Loss) on Sale of Investments	0	1,158	0
Other than Temporary Impairment Losses, Investments	0	0	17
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax	0	1,158	17
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	0	405	6
Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	753	11
Amortization of prior service cost [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	15	19	20
Amortization of net loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	$ 637	$ 0	$ 2,703

Earnings Per Common Share - Su

Earnings Per Common Share - Summary of Computation of Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Net income available to common shareholders	$ 81,012	$ 83,957	$ 76,869
Denominator:
Weighted-average common shares outstanding	15,364,281	15,394,971	15,412,365
Effect of dilutive securities – performance based restricted stock units	40,459	18,861	0
Earnings per common share:	15,404,740	15,413,832	15,412,365
Earnings per common share:
Basic earnings per common share	$ 5.27	$ 5.45	$ 4.99
Diluted earnings per common share	$ 5.26	$ 5.45	$ 4.99

Earnings Per Common Share - Na

Earnings Per Common Share - Narrative (Details) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Class of Warrant or Right [Line Items]
Weighted Average Number Diluted Shares Outstanding Adjustment	40,459	18,861	0
2013 Long Term Incentive Plan [Member]
Class of Warrant or Right [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	23,025	21,975
Common Shares
Class of Warrant or Right [Line Items]
Treasury Stock, Shares, Acquired	71,700	29,700	10,550

Dividend Restrictions (Details)

Dividend Restrictions (Details) $ in Millions	Dec. 31, 2015USD ($)
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Amount available for dividend distribution without prior approval from regulatory authority	$ 107.5

Financial Instruments With O113

Financial Instruments With Off-Balance Sheet Risk And Financial Instruments With Concentrations Of Credit Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Risks and Uncertainties [Abstract]
Loan commitments	$ 888,411	$ 869,793
Standby letters of credit	$ 12,326	$ 12,473

Loan Servicing - Narrative (De

Loan Servicing - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Servicing Assets at Fair Value [Line Items]
Mortgage Servicing Rights Fair Value	$ 9,593	$ 9,057
Transfers and Servicing of Financial Assets [Abstract]
Serviced sold mortgage loans	1,276,000	1,265,000	$ 1,326,000
Serviced sold mortgage loans with recourse	5,400	7,000
Mortgage loans sold with recourse, reserve	$ 454	$ 400
Mortgage servicing rights, discount rate	10.00%	10.00%
Servicing fees included in other service income	$ 3,400	$ 3,500	$ 3,600
Minimum
Transfers and Servicing of Financial Assets [Abstract]
Mortgage servicing rights, constant prepayment speeds	6.30%	5.70%
Maximum
Transfers and Servicing of Financial Assets [Abstract]
Mortgage servicing rights, constant prepayment speeds	22.00%	22.30%

Loan Servicing - Activity for

Loan Servicing - Activity for MSRs And Related Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Mortgage servicing rights:
Carrying amount, net, beginning of year	$ 8,613	$ 9,013	$ 7,763
Additions	1,748	1,026	2,436
Amortization	(1,637)	(1,631)	(2,479)
Change in valuation allowance	284	205	1,293
Carrying amount, net, end of year	9,008	8,613	9,013
Valuation allowance:
Beginning of year	826	1,031	2,324
Change in valuation allowance	(284)	(205)	(1,293)
End of year	$ 542	$ 826	$ 1,031

Fair Values - Narrative (Detai

Fair Values - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount percentage applied to real estate appraised values	15.00%
Discount percentage applied to lot development appraised values	6.00%
Partial charge-offs on impaired loans	$ 28,705	$ 32,480
Allowance for loans individually evaluated for impairment	4,191	3,660
Book Value Of Impaired Loans Carried At Fair Value	11,783	19,643
Impaired loans carried at fair value	9,496	16,963
Impaired Financing Receivable, Related Allowance	4,191	3,660
Impaired Financing Receivable, carried at fair value, related expense	2,100	3,000	$ 8,100
MSR recorded at lower of cost or fair value	9,008	8,613	9,013	$ 7,763
Servicing Asset at Fair Value, Amount	1,900	2,900
Mortgage Servicing Rights, at fair value	9,593	9,057
Valuation allowance of MSR	542	826	1,031	$ 2,324
MSRs recorded at cost	7,100	5,700
Valuation allowance for impairment of recognized servicing assets, provisions (recoveries)	284	205	1,293
Other Real Estate, Foreclosed Assets, and Repossessed Assets	$ 18,651	22,605
Percent of OREO held at fair value	46.00%
Estimated fair value of other real estate owned (OREO)	$ 8,500	10,300
OREO devaluations	1,592	2,406	$ 3,180
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Financing Receivable, Related Allowance	$ 2,287	$ 2,680

Fair Values - Assets and Liabi

Fair Values - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage Loans Held for Sale	$ 7,306	$ 5,264
Mortgage IRLCs	165	70
Level 1
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage IRLCs	0	0
Level 2
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage Loans Held for Sale	7,306	5,264
Mortgage IRLCs	165	70
Level 3
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage IRLCs	0	0
Fair value swap
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swaps, fair value	226	226
Fair value swap | Level 3
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swaps, fair value	226	226
Recurring basis
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage Loans Held for Sale	7,306	5,264
Mortgage IRLCs	165	70
Recurring basis | Level 2
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage Loans Held for Sale	7,306	5,264
Mortgage IRLCs	165	70
Recurring basis | Obligations of U.S. Treasury and other U.S. Government sponsored entities
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment Securities	522,063	538,064
Recurring basis | Obligations of U.S. Treasury and other U.S. Government sponsored entities | Level 2
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment Securities	522,063	538,064
Recurring basis | U.S. Government Sponsored Entities’ Asset-Backed Securities
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment Securities	911,493	761,153
Recurring basis | U.S. Government Sponsored Entities’ Asset-Backed Securities | Level 2
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment Securities	911,493	761,153
Recurring basis | Equity securities
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment Securities	2,710	2,698
Recurring basis | Equity securities | Level 1
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment Securities	1,941	1,922
Recurring basis | Equity securities | Level 3
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment Securities	769	776
Recurring basis | Fair value swap
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swaps, fair value	226	226
Recurring basis | Fair value swap | Level 3
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swaps, fair value	$ 226	$ 226

Fair Values - Reconciliation o

Fair Values - Reconciliation of the Level 3 Inputs for Financial Instruments Measured on a Recurring Basis (Details) - Recurring basis - Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 776	$ 759
Total Gains (Losses)
Included in earnings - realized	0	0
Included in earnings - unrealized	0	0
Included in other comprehensive loss	(7)	17
Purchases, sales, issuances and settlements, other, net	0	0
Re-evaluation of fair value swap		0
Ending balance	769	776
Fair Value Swap
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(226)	(135)
Total Gains (Losses)
Included in earnings - realized	0	0
Included in earnings - unrealized	0	0
Purchases, sales, issuances and settlements, other, net	0	0
Re-evaluation of fair value swap		(91)
Ending Balance	$ (226)	$ (226)

Fair Values - Assets and Li119

Fair Values - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	$ 9,496	$ 16,963
Mortgage Servicing Rights	1,900	2,900
Other loans	4,997,318	4,757,461
Level 3
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	9,496	16,963
Other loans	4,997,318	4,757,461
Nonrecurring basis
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	9,496	16,963
Mortgage Servicing Rights	1,867	2,928
Other loans	8,515	10,312
Nonrecurring basis | Level 1
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans	0	0
Nonrecurring basis | Level 2
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Mortgage Servicing Rights	1,867	2,928
Other loans	0	0
Nonrecurring basis | Level 3
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	9,496	16,963
Other loans	8,515	10,312
Nonrecurring basis | Commercial real estate
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	3,698	8,481
Other loans	2,796	1,470
Nonrecurring basis | Commercial real estate | Level 1
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans	0	0
Nonrecurring basis | Commercial real estate | Level 2
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans	0	0
Nonrecurring basis | Commercial real estate | Level 3
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	3,698	8,481
Other loans	2,796	1,470
Nonrecurring basis | Construction real estate
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans	3,387	6,473
Nonrecurring basis | Construction real estate | Level 1
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans	0	0
Nonrecurring basis | Construction real estate | Level 2
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans	0	0
Nonrecurring basis | Construction real estate | Level 3
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans	3,387	6,473
Nonrecurring basis | SEPH commercial land and development
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	2,044
Nonrecurring basis | SEPH commercial land and development | Level 3
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	2,044
Nonrecurring basis | SEPH commercial land and development
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value		2,078
Nonrecurring basis | SEPH commercial land and development | Level 3
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value		2,078
Nonrecurring basis | Remaining commercial
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	1,872	3,483
Nonrecurring basis | Remaining commercial | Level 3
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	1,872	3,483
Nonrecurring basis | Residential real estate
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	1,882	2,921
Other loans	2,332	2,369
Nonrecurring basis | Residential real estate | Level 1
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans	0	0
Nonrecurring basis | Residential real estate | Level 2
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans	0	0
Nonrecurring basis | Residential real estate | Level 3
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	1,882	2,921
Other loans	$ 2,332	$ 2,369

Fair Values - Qualitative Info

Fair Values - Qualitative Information About Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on a Non-recurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	$ 9,496	$ 16,963
Other real estate owned	4,997,318	4,757,461
Nonrecurring basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	9,496	16,963
Other real estate owned	8,515	10,312
Commercial real estate | Nonrecurring basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	3,698	8,481
Other real estate owned	2,796	1,470
Commercial real estate | Nonrecurring basis | Loans receivable
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	3,698	8,481
Construction real estate | Nonrecurring basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other real estate owned	3,387	6,473
SEPH commercial land and development | Nonrecurring basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	2,044
SEPH commercial land and development | Nonrecurring basis | Loans receivable
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	2,044	2,078
Remaining commercial | Nonrecurring basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	1,872	3,483
Remaining commercial | Nonrecurring basis | Loans receivable
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	1,872	3,483
Residential real estate | Nonrecurring basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	1,882	2,921
Other real estate owned	2,332	2,369
Residential real estate | Nonrecurring basis | Loans receivable
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	1,882	2,921
Commercial real estate | Nonrecurring basis | Other real estate owned
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other real estate owned	2,796	1,470
Construction real estate | Nonrecurring basis | Other real estate owned
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other real estate owned	3,387	6,473
Residential Real Estate | Nonrecurring basis | Other real estate owned
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other real estate owned	$ 2,332	$ 2,369
Sales comparison approach | Commercial real estate | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	0.00%	0.00%
Sales comparison approach | Commercial real estate | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	45.90%	84.00%
Sales comparison approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	20.30%	38.80%
Sales comparison approach | SEPH commercial land and development | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	5.00%	5.00%
Sales comparison approach | SEPH commercial land and development | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	40.00%	35.00%
Sales comparison approach | SEPH commercial land and development | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	22.10%	17.50%
Sales comparison approach | Remaining commercial | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	0.00%	0.20%
Sales comparison approach | Remaining commercial | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	25.30%	76.00%
Sales comparison approach | Remaining commercial | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	1.00%	45.40%
Sales comparison approach | Residential real estate | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	0.00%	0.00%
Sales comparison approach | Residential real estate | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	96.70%	120.60%
Sales comparison approach | Residential real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	12.50%	11.10%
Sales comparison approach | Commercial real estate | Low | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	2.00%	0.00%
Sales comparison approach | Commercial real estate | High | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	71.00%	87.00%
Sales comparison approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	26.90%	30.50%
Sales comparison approach | Construction real estate | Low | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	0.00%	0.00%
Sales comparison approach | Construction real estate | High | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	85.00%	82.90%
Sales comparison approach | Construction real estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	24.30%	27.10%
Sales comparison approach | Residential Real Estate | Low | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	0.10%	0.00%
Sales comparison approach | Residential Real Estate | High | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	61.80%	38.30%
Sales comparison approach | Residential Real Estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	23.00%	10.10%
Income approach | Commercial real estate | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Capitalization rate	7.00%	8.00%
Income approach | Commercial real estate | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Capitalization rate	13.30%	9.50%
Income approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Capitalization rate	9.50%	9.40%
Income approach | Residential real estate | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Capitalization rate	3.80%	7.90%
Income approach | Residential real estate | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Capitalization rate	10.10%	10.00%
Income approach | Residential real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Capitalization rate	9.10%	8.00%
Income approach | Commercial real estate | Low | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Capitalization rate	9.50%	8.40%
Income approach | Commercial real estate | High | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Capitalization rate	9.50%	10.00%
Income approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Capitalization rate	9.50%	9.40%
Income approach | Residential Real Estate | Low | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Capitalization rate		6.80%
Income approach | Residential Real Estate | High | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Capitalization rate		7.80%
Income approach | Residential Real Estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Capitalization rate		7.60%
Cost approach | Commercial real estate | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Fair Value Inputs, Accumulated Depreciation	50.00%	23.00%
Cost approach | Commercial real estate | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Fair Value Inputs, Accumulated Depreciation	50.00%	23.00%
Cost approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Fair Value Inputs, Accumulated Depreciation	50.00%	23.00%
Cost approach | Residential real estate | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Fair Value Inputs, Accumulated Depreciation	33.30%
Cost approach | Residential real estate | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Fair Value Inputs, Accumulated Depreciation	50.00%
Cost approach | Residential real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Fair Value Inputs, Accumulated Depreciation	43.40%
Cost approach | Commercial real estate | Low | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Fair Value Inputs, Accumulated Depreciation		60.00%
Cost approach | Commercial real estate | High | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Fair Value Inputs, Accumulated Depreciation		95.00%
Cost approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Fair Value Inputs, Accumulated Depreciation		77.50%
Bulk sale approach | SEPH commercial land and development | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Discount rate	10.70%	10.80%
Bulk sale approach | SEPH commercial land and development | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Discount rate	10.70%	10.80%
Bulk sale approach | SEPH commercial land and development | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Discount rate	10.70%	10.80%
Bulk sale approach | Remaining commercial | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Discount rate	10.00%	10.00%
Bulk sale approach | Remaining commercial | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Discount rate	10.70%	22.00%
Bulk sale approach | Remaining commercial | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Discount rate	10.00%	16.50%
Bulk sale approach | Construction real estate | Low | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Discount rate	15.00%	15.00%
Bulk sale approach | Construction real estate | High | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Discount rate	15.00%	15.00%
Bulk sale approach | Construction real estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Discount rate	15.00%	15.00%

Fair Values - Fair Value of Fi

Fair Values - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Financial assets:
Cash and money market instruments	$ 149,459	$ 237,699
Investment securities	1,587,694	1,445,405
Mortgage loans held for sale	7,306	5,264
Impaired loans carried at fair value	9,496	16,963
Derivative Asset	165	70
Other loans	4,997,318	4,757,461
Loans receivable, net	5,014,285	4,779,758
Financial liabilities:
Non-interest bearing checking accounts	1,404,032	1,269,296
Interest bearing transaction accounts	1,107,200	1,122,079
Savings accounts	1,544,708	1,325,445
Time Deposits, Fair Value	1,295,329	1,422,885
Other	1,290	1,269
Total deposits	5,352,559	5,140,974
Short-term borrowings	394,242	276,980
Long-term debt	771,420	827,500
Subordinated debentures/notes	41,596	42,995
Fair value swap
Derivative financial instruments:
Swaps, fair value	226	226
Carrying value
Financial assets:
Cash and money market instruments	149,459	237,699
Investment securities	1,585,568	1,442,477
Mortgage loans held for sale	7,306	5,264
Impaired loans carried at fair value	9,496	16,963
Derivative Asset	165	70
Other loans	4,994,624	4,753,033
Loans receivable, net	5,011,591	4,775,330
Financial liabilities:
Non-interest bearing checking accounts	1,404,032	1,269,296
Interest bearing transaction accounts	1,107,200	1,122,079
Savings accounts	1,544,708	1,325,445
Time Deposits, Fair Value	1,290,412	1,409,911
Other	1,290	1,269
Total deposits	5,347,642	5,128,000
Short-term borrowings	394,242	276,980
Long-term debt	738,105	786,602
Subordinated debentures/notes	45,000	45,000
Carrying value | Fair value swap
Derivative financial instruments:
Swaps, fair value	226	226
Level 1
Financial assets:
Cash and money market instruments	149,459	237,699
Investment securities	1,941	1,922
Derivative Asset	0	0
Loans receivable, net	0	0
Financial liabilities:
Non-interest bearing checking accounts	1,404,032	1,269,296
Interest bearing transaction accounts	1,107,200	1,122,079
Savings accounts	1,544,708	1,325,445
Other	1,290	1,269
Total deposits	4,057,230	3,718,089
Level 2
Financial assets:
Investment securities	1,584,984	1,442,708
Mortgage loans held for sale	7,306	5,264
Derivative Asset	165	70
Loans receivable, net	7,471	5,334
Financial liabilities:
Time Deposits, Fair Value	1,295,329	1,422,885
Total deposits	1,295,329	1,422,885
Short-term borrowings	394,242	276,980
Long-term debt	771,420	827,500
Subordinated debentures/notes	41,596	42,995
Level 3
Financial assets:
Investment securities	769	775
Impaired loans carried at fair value	9,496	16,963
Derivative Asset	0	0
Other loans	4,997,318	4,757,461
Loans receivable, net	5,006,814	4,774,424
Financial liabilities:
Total deposits	0	0
Level 3 | Fair value swap
Derivative financial instruments:
Swaps, fair value	226	226
Available-for-sale Securities [Member]
Financial assets:
Accrued interest receivable	4,436	4,048
Available-for-sale Securities [Member] | Carrying value
Financial assets:
Accrued interest receivable	4,436	4,048
Available-for-sale Securities [Member] | Level 2
Financial assets:
Accrued interest receivable	4,436	4,048
Loans
Financial assets:
Accrued interest receivable	14,239	13,629
Loans | Carrying value
Financial assets:
Accrued interest receivable	14,239	13,629
Loans | Level 3
Financial assets:
Accrued interest receivable	14,239	13,629
Deposits
Financial liabilities:
Accrued interest payable	987	1,125
Deposits | Carrying value
Financial liabilities:
Accrued interest payable	987	1,125
Deposits | Level 1
Financial liabilities:
Accrued interest payable	66	14
Deposits | Level 2
Financial liabilities:
Accrued interest payable	921	1,111
Borrowings
Financial liabilities:
Accrued interest payable	1,351	1,426
Borrowings | Carrying value
Financial liabilities:
Accrued interest payable	1,351	1,426
Borrowings | Level 1
Financial liabilities:
Accrued interest payable	4	3
Borrowings | Level 2
Financial liabilities:
Accrued interest payable	$ 1,347	$ 1,423

Fair Values Schedule of Impaire

Fair Values Schedule of Impaired Financing Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Book Value Of Impaired Loans Carried At Fair Value	$ 11,783	$ 19,643
Partial Charge-Offs On Impaired Loans carried at Fair Value	10,512	19,731
Impaired Financing Receivable, Related Allowance	4,191	3,660
Impaired loans carried at fair value	9,496	16,963
Impaired Financing Receivable, loans not held at Fair Value, Recorded Investment	68,881	54,069
Partial Charge-offs on Impaired Loans carried at Cost	18,193	12,749
impaired Financing Receivable, loans not held at Fair Value, Carrying Amount	66,977	53,089
Recorded investment	80,664	73,712	$ 112,315
Partial charge-offs on impaired loans	28,705	32,480
Individually evaluated for impairment	4,191	3,660
Impaired Financing Receivable, Carrying Value	76,473	70,052
Financing Receivable, not collateral dependent [Domain]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	1,904	980
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	$ 2,287	$ 2,680

Capital Ratios - Capital Ratio

Capital Ratios - Capital Ratios for Park and Each Subsidiary (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Park National Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Risk-Based Capital	9.83%	10.13%
Tier One Risk Based Capital Required for Capital Adequacy	$ 310,560	$ 191,817
Common Equity Tier 1	9.83%
Common Equity Tier 1 Capital Required For Capital Adequacy	$ 232,920
Total Risk-Based	11.37%	11.74%
Capital Required for Capital Adequacy	$ 414,079	$ 383,634
Leverage Capital Required For Capital Adequacy To Average Total Assets	4.00%	4.00%
Common Equity Tier 1 Capital	$ 508,763
Leverage Capital Required To Be Well Capitalized	$ 360,183	$ 349,013
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	6.00%	4.00%
Leverage Capital	$ 508,763	$ 485,943
Tier One Risk Based Capital Required to be Well Capitalized	$ 414,079	$ 287,725
Common Equity Tier 1 Capital Required For Capital Adequacy To Average Total Assets	4.50%
Common Equity Tier 1 Capital Required To Be Well Capitalized	$ 336,439
Leverage	7.06%	6.96%
Leverage Capital Required For Capital Adequacy	$ 288,147	$ 279,210
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%	8.00%
Capital Required to be Well Capitalized	$ 517,599	$ 479,542
Leverage Capital Required To Be Well Capitalized To Average Total Assets	5.00%	5.00%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%	6.00%
Tier One Risk Based Capital	$ 508,763	$ 485,943
Common Equity Tier 1 Capital Required To Be Well Capitalized To Average Total Assets	6.50%
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%	10.00%
Risk Based Capital	$ 588,467	$ 563,188
Park
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Risk-Based Capital	12.82%	13.39%
Tier One Risk Based Capital Required for Capital Adequacy	$ 314,310	$ 195,411
Common Equity Tier 1	12.54%
Common Equity Tier 1 Capital Required For Capital Adequacy	$ 235,732
Total Risk-Based	14.49%	15.14%
Capital Required for Capital Adequacy	$ 419,080	$ 390,822
Leverage Capital Required For Capital Adequacy To Average Total Assets	4.00%	4.00%
Common Equity Tier 1 Capital	$ 656,664
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	6.00%	4.00%
Leverage Capital	$ 671,664	$ 654,339
Common Equity Tier 1 Capital Required For Capital Adequacy To Average Total Assets	4.50%
Leverage	9.22%	9.25%
Leverage Capital Required For Capital Adequacy	$ 291,449	$ 282,992
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%	8.00%
Leverage Capital Required For Capital Adequacy plus capital conservation buffer To Average Total Assets	4.00%
Tier One Risk Based Capital Required For Capital Adequacy plus capital conservation buffer To Average Total Assets	8.50%
Common Equity Tier 1 Capital Required For Capital Adequacy plus capital conservation buffer To Average Total Assets	7.00%
Capital Required For Capital Adequacy plus capital conservation buffer To Average Total Assets	10.50%
Tier One Risk Based Capital	$ 671,664	$ 654,339
Risk Based Capital	$ 758,988	$ 739,517

Segment Information - Schedule

Segment Information - Schedule of Operating Results by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Other Noninterest Expense	$ 179,267	$ 180,267	$ 174,200
Net interest income (loss)	227,632	225,044	221,025
Depreciation, Amortization and Accretion, Net	7,347	7,243	7,315
Provision for (recovery of) loan losses	4,990	(7,333)	3,415
Other income (loss)	77,551	75,549	73,277
Gain (Loss) on Sale of Investments	0	(1,158)	0
Other expense	186,614	187,510	181,515
Income (loss) before taxes	113,579	120,416	109,372
Income taxes (benefit)	32,567	36,459	32,503
Net income	81,012	83,957	76,869
Assets	7,311,354	7,001,199	6,636,423
Loans	5,068,085	4,829,682	4,620,505
Deposits	5,347,642	5,128,000	4,789,994
Totals For Reportable Segments [Member]
Segment Reporting Information [Line Items]
Other Noninterest Expense	169,295	172,267	166,680
Net interest income (loss)	227,393	227,056	218,197
Depreciation, Amortization and Accretion, Net	7,347	7,243	7,315
Income taxes (benefit)	37,238	41,246	35,329
Assets	7,299,098	6,994,456	6,642,070
Deposits	5,451,920	5,228,649	4,903,564
PNB
Segment Reporting Information [Line Items]
Net interest income (loss)	220,879	218,641	210,781
Provision for (recovery of) loan losses	7,665	3,517	14,039
Other income (loss)	75,188	69,384	70,841
Other expense	167,476	163,641	158,651
Income (loss) before taxes	120,926	120,867	108,932
Income taxes (benefit)	36,581	37,960	33,696
Net income	84,345	82,907	75,236
Assets	7,229,764	6,910,386	6,522,174
Loans	5,029,072	4,781,761	4,559,406
Deposits	5,447,293	5,222,766	4,896,405
GFSC
Segment Reporting Information [Line Items]
Net interest income (loss)	6,588	7,457	8,741
Provision for (recovery of) loan losses	1,415	1,544	1,175
Other income (loss)	2	(1)	11
Other expense	2,984	4,103	3,133
Income (loss) before taxes	2,191	1,809	4,444
Income taxes (benefit)	768	634	1,556
Net income	1,423	1,175	2,888
Assets	35,793	40,308	47,115
Loans	35,469	40,645	47,228
Deposits	4,627	5,883	7,159
SEPH
Segment Reporting Information [Line Items]
Net interest income (loss)	(74)	958	(1,325)
Provision for (recovery of) loan losses	(4,090)	(12,394)	(11,799)
Other income (loss)	1,848	5,991	1,956
Other expense	6,182	11,766	12,211
Income (loss) before taxes	(318)	7,577	219
Income taxes (benefit)	(111)	2,652	77
Net income	(207)	4,925	142
Assets	33,541	43,762	72,781
Loans	15,153	23,956	38,014
Deposits	0	0	0
All Other
Segment Reporting Information [Line Items]
Net interest income (loss)	239	(2,012)	2,828
Provision for (recovery of) loan losses	0	0	0
Other income (loss)	513	175	469
Other expense	9,972	8,000	7,520
Income (loss) before taxes	(9,220)	(9,837)	(4,223)
Income taxes (benefit)	(4,671)	(4,787)	(2,826)
Net income	(4,549)	(5,050)	(1,397)
Assets	12,256	6,743	(5,647)
Loans	(11,609)	(16,680)	(24,143)
Deposits	(104,278)	(100,649)	(113,570)
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Other Noninterest Expense	0	0	0
Net interest income (loss)	2,561	3,708	8,659
Depreciation, Amortization and Accretion, Net	0	0	0
Income taxes (benefit)	0	0	0
Assets	(13,557)	(18,556)	(30,369)
Deposits	(104,278)	(100,649)	(113,570)
Parent Co Gfsc Totals Not Eliminated [Member]
Segment Reporting Information [Line Items]
Other Noninterest Expense	9,972	8,000	7,520
Net interest income (loss)	(2,322)	(5,720)	(5,831)
Depreciation, Amortization and Accretion, Net	0	0	0
Income taxes (benefit)	(4,671)	(4,787)	(2,826)
Assets	25,813	25,299	24,722
Deposits	$ 0	$ 0	$ 0

Parent Company Statements - Na

Parent Company Statements - Narrative (Details) - Parent Company - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income taxes	$ 4,130	$ 5,810	$ 2,540
Undistributed earnings, restricted from transfer as dividends	$ 199,400	$ 196,500

Parent Company Statements - Ba

Parent Company Statements - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets:
Other assets	$ 506,425	$ 487,382
Total assets	7,311,354	7,001,199	$ 6,636,423
Liabilities:
Subordinated notes	45,000	45,000
Other liabilities	73,010	68,076
Total liabilities	6,597,999	6,304,658
Total liabilities and shareholders’ equity	7,311,354	7,001,199
Parent Company
Assets:
Cash	102,416	98,671	$ 106,942	$ 98,726
Investment in subsidiaries	613,383	599,855
Debentures receivable from PNB	25,000	25,000
Other investments	2,341	2,344
Other assets	23,443	23,260
Total assets	766,583	749,130
Liabilities:
Subordinated notes	45,000	45,000
Other liabilities	8,228	7,589
Total liabilities	53,228	52,589
Total shareholders’ equity	713,355	696,541
Total liabilities and shareholders’ equity	$ 766,583	$ 749,130

Parent Company Statements - St

Parent Company Statements - Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income:
Interest and dividends	$ 265,074	$ 265,143	$ 262,947
Expense:
Federal income tax benefit	(32,567)	(36,459)	(32,503)
Net income	81,012	83,957	76,869
Other Comprehensive Income (Loss), Net of Tax	(2,035)	21,811	(17,901)
Parent Company
Income:
Dividends from subsidiaries	60,000	60,000	15,000
Interest and dividends	2,561	3,708	8,659
Other	560	262	531
Total income	63,121	63,970	24,190
Expense:
Other, net	12,341	13,807	13,413
Total expense	12,341	13,807	13,413
Income before federal taxes and equity in undistributed income of subsidiaries	50,780	50,163	10,777
Federal income tax benefit	4,671	4,787	2,826
Income before equity in undistributed income of subsidiaries	55,451	54,950	13,603
Equity in undistributed income of subsidiaries	25,561	29,007	63,266
Net income	81,012	83,957	76,869
Other Comprehensive Income (Loss), Net of Tax	(2,035)	21,811	(17,901)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 78,977	$ 105,768	$ 58,968

Parent Company Statements -128

Parent Company Statements - Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net income	$ 81,012	$ 83,957	$ 76,869
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based Compensation	1,828	1,259	850
Increase (decrease) in other liabilities	1,173	5,689	(5,324)
Net cash provided by operating activities	88,702	71,743	121,288
Investing activities:
Net cash used in investing activities	(395,468)	(229,580)	(112,642)
Financing activities
Repayment of subordinated notes	0	(35,250)	0
Treasury Stock, Value, Acquired, Cost Method	(6,058)	(2,355)	(843)
Net cash provided by (used in) financing activities	218,526	248,506	(62,921)
Increase (decrease) in cash and cash equivalents	(88,240)	90,669	(54,275)
Parent Company
Net income	81,012	83,957	76,869
Adjustments to reconcile net income to net cash provided by operating activities:
Undistributed income of subsidiaries	(25,561)	(29,007)	(63,266)
Decrease in other assets	(182)	(1,292)	(2,215)
Increase (decrease) in other liabilities	485	298	(2,187)
Net cash provided by operating activities	57,582	55,215	10,051
Investing activities:
Capital contribution in subsidiary	0	0	(45,000)
Repayment of investments in and advances to subsidiaries	10,000	32,000	101,960
Net cash used in investing activities	10,000	32,000	56,960
Financing activities
Cash dividends paid	(57,776)	(57,876)	(57,949)
Cash payment for fractional shares	(3)	(5)	(3)
Net cash provided by (used in) financing activities	(63,837)	(95,486)	(58,795)
Increase (decrease) in cash and cash equivalents	3,745	(8,271)	8,216
Cash at beginning of year	98,671	106,942	98,726
Cash at end of year	102,416	98,671	106,942
Parent Company
Adjustments to reconcile net income to net cash provided by operating activities:
Compensation expense for issuance of treasury shares to directors	963	801	850
Share-based Compensation	$ 865	$ 458	$ 0