Park National (PRK) 10-K 24 Feb 15 2014 FY Annual report Financial data

Document_And_Entity_Informatio

Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Feb. 23, 2015	Jun. 30, 2014
Entity Information [Line Items]
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Entity Registrant Name	PARK NATIONAL CORP /OH/
Entity Central Index Key	805676
Current Fiscal Year End Date	-19
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		15,370,891
Entity Public Float			$1,137,557,054

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets:
Cash and due from banks	$133,511	$129,078
Money market instruments	104,188	17,952
Cash and cash equivalents	237,699	147,030
Investment securities:
Securities available-for-sale, at fair value (amortized cost of $1,299,980 and $1,222,143 at December 31, 2014 and 2013, respectively)	1,301,915	1,176,266
Securities held-to-maturity, at amortized cost (fair value of $143,490 and $187,402 at December 31, 2014 and 2013, respectively)	140,562	182,061
Other investment securities	58,311	65,907
Total investment securities	1,500,788	1,424,234
Total loans	4,829,682	4,620,505
Allowance for loan losses	-54,352	-59,468
Net loans	4,775,330	4,561,037
Other assets:
Bank owned life insurance	171,928	169,284
Goodwill	72,334	72,334
Premises and equipment, net	55,479	55,278
Accrued interest receivable	17,677	18,335
OREO	22,605	34,636
Mortgage loan servicing rights	8,613	9,013
Other	140,803	147,166
Total other assets	489,439	506,046
Total assets	7,003,256	6,638,347
Deposits:
Non-interest bearing	1,269,296	1,193,553
Interest bearing	3,858,704	3,596,441
Total deposits	5,128,000	4,789,994
Short-term borrowings	276,980	242,029
Long-term debt	786,602	810,541
Subordinated notes	45,000	80,250
Total borrowings	1,108,582	1,132,820
Other liabilities:
Accrued interest payable	2,551	2,901
Other	65,525	60,885
Total other liabilities	68,076	63,786
Total liabilities	6,304,658	5,986,600
Commitments and Contingencies
Shareholders’ equity:
Preferred Stock, Value, Issued	0	0
Common shares, no par value (20,000,000 shares authorized; 16,150,888 and 16,150,941 shares issued at December 31, 2014 and 2013, respectively)	303,104	302,651
Accumulated other comprehensive loss, net	-13,608	-35,419
Retained earnings	486,541	460,643
Less: Treasury shares (758,489 and 738,989 shares at December 31, 2014 and 2013, respectively)	-77,439	-76,128
Total shareholders’ equity	698,598	651,747
Total liabilities and shareholders’ equity	$7,003,256	$6,638,347

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Amortized cost of securities available-for-sale	$1,299,980	$1,222,143
Fair value of securities held-to-maturity	$143,490	$187,402
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	16,150,888	16,150,941
Treasury stock, shares	758,489	738,989

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest and dividend income:
Interest and fees on loans	$227,644	$225,538	$234,638
Interest and dividends on:
Obligations of U.S. Government, its agencies and other securities	36,981	36,686	50,549
Obligations of states and political subdivisions	3	45	140
Other interest income	515	678	408
Total interest and dividend income	265,143	262,947	285,735
Interest on deposits:
Demand and savings deposits	1,677	1,773	2,483
Time deposits	9,323	11,235	15,921
Interest on short-term borrowings	517	544	678
Interest on long-term debt	28,582	28,370	31,338
Total interest expense	40,099	41,922	50,420
Net interest income	225,044	221,025	235,315
(Recovery of) provision for loan losses	-7,333	3,415	35,419
Net interest income after (recovery of) provision for loan losses	232,377	217,610	199,896
Other income:
Income from fiduciary activities	19,150	17,133	15,947
Service charges on deposit accounts	15,423	16,316	16,704
Net gain on sales of securities	-1,158	0	0
Other service income	10,459	12,913	13,631
Checkcard fee income	13,570	12,955	12,541
Bank owned life insurance income	4,861	5,041	4,754
ATM fees	2,467	2,632	2,359
Gain on sale of OREO, net	5,503	3,110	4,414
OREO devaluations	-2,406	-3,180	-6,872
Gain (Loss) on Sales of Loans, Net	1,867	0	0
Gain on sale of Vision Bank business	0	0	22,167
Miscellaneous	5,813	6,357	6,758
Total other income	75,549	73,277	92,403
Other expense:
Salaries and employee benefits	101,968	100,298	95,977
Data processing fees	4,712	4,174	3,916
Professional fees and services	29,580	27,865	24,267
Net occupancy expense of bank premises	10,006	9,804	9,444
Amortization of intangibles	0	337	2,172
Furniture and equipment expense	11,571	11,249	10,788
Insurance	5,723	5,205	5,780
Marketing	4,371	3,790	3,474
Postage and telephone	5,268	5,790	5,983
State taxes	2,290	3,702	3,786
Loan put provision	0	0	3,299
OREO expense	2,063	2,731	4,011
Affordable Housing Program Assessments	7,724	7,014	6,841
Miscellaneous	9,958	6,570	8,230
Total other expense	195,234	188,529	187,968
Income (loss) before taxes	112,692	102,358	104,331
Federal income taxes	28,602	25,131	25,701
Net income	84,090	77,227	78,630
Preferred share dividends and accretion	0	0	3,425
Income available to common shareholders	$84,090	$77,227	$75,205
Earnings per common share:
Basic (in dollars per share)	$5.46	$5.01	$4.88
Diluted (in dollars per share)	$5.46	$5.01	$4.88

Statements_of_Comprehensive_In

Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$84,090	$77,227	$78,630
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax	12	1,770	1,123
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	-9,279	19,766	-7,303
Other comprehensive income (loss), net of tax:
Changes in pension plan assets and benefit obligations recognized in other comprehensive income	-9,267	21,536	-6,180
Unrealized net holding gain on cash flow hedge, net of income taxes of $296 for the year ended December 31, 2012	0	0	550
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	753	0	0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Net of Tax	0	11	35
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax	30,325	-39,448	-3,092
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	31,078	-39,437	-3,057
Other Comprehensive Income (Loss), Net of Tax	21,811	-17,901	-8,687
Comprehensive income	$105,901	$59,326	$69,943

Statements_of_Comprehensive_In1

Statements of Comprehensive Income (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Tax Effect
Amortization of net loss and prior service costs, tax expense	$7	$953	$605
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	-4,997	10,643	-3,933
Unrealized net holding gain on cash flow hedge, tax Expense	0	0	296
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	405	0	0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, Tax	0	6	19
Unrealized net holding gain (loss) on securities available-for-sale, tax expense	$16,329	($21,242)	($1,664)

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Stockholders' Equity (USD $)	Total	Preferred Shares	Common Shares	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2011	$742,364,000	$98,146,000	$305,499,000	$424,557,000	($77,007,000)	($8,831,000)
Beginning balance, shares at Dec. 31, 2011		100,000	15,405,912
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	78,630,000			78,630,000
Other Comprehensive Income (Loss), Net of Tax	-8,687,000					-8,687,000
Cash dividends	-57,932,000			-57,932,000
Fractional shares issued in dividend reinvestment plan, shares			-34
Cash payment for fractional shares in dividend reinvestment plan	-2,000		-2,000
Treasury Stock, Value, Acquired, Cost Method	0
Common share warrants redeemed	-2,843,000		-2,843,000
Preferred shares redeemed	-100,000,000	-100,000,000
Preferred shares redeemed, shares		-100,000
Accretion of discount on preferred shares	0	1,854,000		-1,854,000
Preferred share dividends	-1,571,000			-1,571,000
Treasury Stock Reissued Shares For Director Grants			6,120
Treasury shares reissued for director grants	407,000			-225,000	632,000
Ending balance at Dec. 31, 2012	650,366,000	0	302,654,000	441,605,000	-76,375,000	-17,518,000
Ending balance, shares at Dec. 31, 2012		0	15,411,998
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	77,227,000			77,227,000
Other Comprehensive Income (Loss), Net of Tax	-17,901,000					-17,901,000
Cash dividends	-57,949,000			-57,949,000
Fractional shares issued in dividend reinvestment plan, shares			-46
Cash payment for fractional shares in dividend reinvestment plan	-3,000		-3,000
Allocated Share-based Compensation Expense	0
Treasury Stock, Shares, Acquired			-10,550
Treasury Stock, Value, Acquired, Cost Method	-843,000				-843,000
Treasury Stock Reissued Shares For Director Grants			10,550
Treasury shares reissued for director grants	850,000			-240,000	1,090,000
Ending balance at Dec. 31, 2013	651,747,000	0	302,651,000	460,643,000	-76,128,000	-35,419,000
Ending balance, shares at Dec. 31, 2013		0	15,411,952
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	84,090,000			84,090,000
Other Comprehensive Income (Loss), Net of Tax	21,811,000					21,811,000
Cash dividends	-57,949,000			-57,949,000
Fractional shares issued in dividend reinvestment plan, shares			-53
Cash payment for fractional shares in dividend reinvestment plan	-5,000		-5,000
Allocated Share-based Compensation Expense	458,000		458,000
Treasury Stock, Shares, Acquired			-29,700
Treasury Stock, Value, Acquired, Cost Method	-2,355,000				-2,355,000
Treasury Stock Reissued Shares For Director Grants			10,200
Treasury shares reissued for director grants	801,000			-243,000	1,044,000
Ending balance at Dec. 31, 2014	$698,598,000	$0	$303,104,000	$486,541,000	($77,439,000)	($13,608,000)
Ending balance, shares at Dec. 31, 2014		0	15,392,399

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes In Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash dividends on common stock per share	$3.76	$3.76	$3.76

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest Paid	$40,449	$42,481	$51,877
Operating activities:
Net income	84,090	77,227	78,630
Adjustments to reconcile net income to net cash provided by operating activities:
(Recovery of) provision for loan losses	-7,333	3,415	35,419
Loan put provision	0	0	3,299
Amortization of loan fees and costs, net	4,160	3,611	2,119
Depreciation	7,243	7,315	6,954
Other than temporary impairment on investment securities	0	17	54
Amortization of intangible assets	0	337	2,172
Accretion of investment securities	-213	-33	-239
Amortization of prepayment penalty on long term debt	5,031	4,835	0
Deferred income tax	1,563	-2,456	12,717
Realized net investment security losses	1,158	0	0
Loan originations to be sold in secondary market	-136,125	-317,534	-442,890
Proceeds from sale of loans in secondary market	135,209	345,704	434,489
Gain on sale of loans in secondary market	-1,867	0	0
Proceeds from Sale of Other Loans Held-for-sale	20,966	0	0
Share-based Compensation	1,259	850	407
OREO devaluations	2,406	3,180	6,872
Gains (Losses) on Sales of Other Real Estate	-5,503	-3,110	-4,414
Proceeds from Sale of Other Real Estate	27,798	23,043	26,988
Bank owned life insurance income	-4,861	-5,041	-4,754
Changes in assets and liabilities:
(Increase) Decrease in other assets	-23,200	6,818	-14,171
Decrease in other liabilities	13,629	1,676	954
Net cash provided by operating activities	122,728	145,761	138,799
Investing activities:
Proceeds from Sale of Federal Home Loan Bank Stock	8,946	0	0
Proceeds from sales of securities	173,123	75,000	0
Proceeds from calls and maturities of securities:
Held-to-maturity	41,436	219,329	681,513
Available-for-sale	99,092	385,259	666,431
Purchase of securities:
Held-to-maturity	0	0	-262,679
Available-for-sale	-350,934	-582,728	-964,704
Net (increase) decrease in other investments	-1,350	0	1,697
Net loan originations, portfolio loans	234,017	212,311	186,740
Sales of assets/liabilities related to Vision Bank	0	0	-144,436
Payments for Affordable Housing Programs	-9,417	-8,222	-9,964
Payments to Acquire Life Insurance Policies	0	4,600	2,500
Purchases of premises and equipment, net	-7,444	-8,842	-6,964
Net cash used in investing activities	-280,565	-137,115	-228,346
Financing activities
Net increase in deposits	338,006	73,962	250,918
Net increase (decrease) in short-term borrowings	34,951	-102,139	80,574
Proceeds from issuance of subordinated notes	0	0	30,000
Proceeds from long-term debt	125,000	75,000	300,000
Repayment of subordinated notes	-35,250	0	-25,000
Repayment of long-term debt	-153,970	-50,952	-340,129
Cash payment for repurchase of common share warrant from U.S. Treasury	0	0	-2,843
Repurchase of preferred shares from U.S. Treasury	0	0	-100,000
Treasury Stock, Value, Acquired, Cost Method	-2,355	-843	0
Cash dividends paid	-57,876	-57,949	-60,154
Net cash provided by (used in) financing activities	248,506	-62,921	133,366
Increase (decrease) in cash and cash equivalents	90,669	-54,275	43,819
Cash and cash equivalents at beginning of year	147,030	201,305	157,486
Cash and cash equivalents at end of year	237,699	147,030	201,305
Income Taxes Paid	27,810	20,000	7,000
Non cash activities [Abstract]
Real Estate Owned, Transfer to Real Estate Owned	12,780	22,144	23,634
Transfer of Portfolio Loans and Leases to Held-for-sale	21,985	0	0
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	$2,682	$4,093	$5,807

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2014
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. Reclassifications had no effect on prior year net income or shareholders' equity.
	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 $40.3 million at December 31, 2014 and $48.0 million at December 31, 2013. No other compensating balance arrangements were in existence at December 31, 2014.
	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 6 of these Notes to Consolidated Financial Statements).
	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, 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.
	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. 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. Accrued interest on these loans is considered a loss, unless the loan is well-secured and in the process of collection. Commercial loans placed on nonaccrual status are considered impaired (see Note 7 of these Notes to Consolidated Financial Statements). 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 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 credit cards 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, 2014, 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 2014 within the individual segments of the commercial and consumer loan categories. Management believes the 72-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, 2014 was based on the historical loss experience over the past 72 months, plus an additional judgmental reserve, increasing the total allowance for loan loss coverage in the consumer portfolio to approximately 1.98 years of historical loss. The consumer loan portfolio loss coverage ratio was 1.68 years at December 31, 2013. The loss factor applied to Park’s commercial portfolio as of December 31, 2014 was based on the historical loss experience over the past 72 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 2.28 years of historical loss at December 31, 2014. The commercial loan portfolio loss coverage ratio was 2.42 years at December 31, 2013. 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, the observable market price of 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. 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 stated 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)
	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 is 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 22 of these Notes to Consolidated Financial Statements.)
	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 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, 2014, the goodwill remaining on Park's Consolidated Balance Sheet consisted entirely of goodwill at PNB. (See Note 25 of these Notes to Consolidated Financial Statements 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, 2014, 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, changes in the funded status of the Company’s Defined Benefit Pension Plan, and the unrealized net holding gains and losses on the cash flow hedge that matured on December 28, 2012, 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. (See Note 15 of these Notes to Consolidated Financial Statements.)
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.
Derivative Instruments
At the inception of a derivative contract, the Company designates the derivative as one of three types based on the Company’s intentions and belief as to the derivative's likely effectiveness as a hedge. These three types are: (1) a hedge of the fair value of a recognized asset or liability or of an unrecognized firm commitment (“fair value hedge”); (2) a hedge of a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability (“cash flow hedge”); or (3) an instrument with no hedging designation (“stand-alone derivative”). For a fair value hedge, the gain or loss on the derivative, as well as the offsetting loss or gain on the hedged item, are recognized in current earnings as fair values change. For a cash flow hedge, the gain or loss on the derivative is reported in other comprehensive income and is reclassified into earnings in the same periods during which the hedged transaction affects earnings. For both types of hedges, changes in the fair value of derivatives that are not highly effective in hedging the changes in fair value or expected cash flows of the hedged item are recognized immediately in current earnings. Changes in the fair value of derivatives that do not qualify for hedge accounting are reported currently in earnings, as non-interest income.
The Company formally documents the relationship between derivatives and hedged items, as well as the risk-management objective and the strategy for undertaking hedge transactions at the inception of the hedging relationship. This documentation includes linking fair value or cash flow hedges to specific assets and liabilities on the Consolidated Balance Sheets or to specific firm commitments or forecasted transactions. The Company also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivative instruments that are used are highly effective in offsetting changes in fair values or cash flows of the hedged items. The Company discontinues hedge accounting when it determines that the derivative is no longer effective in offsetting changes in the fair value or cash flows of the hedged item, the derivative is settled or terminates, a hedged forecasted transaction is no longer probable, a hedged firm commitment is no longer firm, or treatment of the derivative as a hedge is no longer appropriate or intended.
When hedge accounting is discontinued, subsequent changes in fair value of the derivative are recorded as non-interest income. When a fair value hedge is discontinued, the hedged asset or liability is no longer adjusted for changes in fair value and the existing basis adjustment is amortized or accreted over the remaining life of the asset or liability. When a cash flow hedge is discontinued but the hedged cash flows or forecasted transactions are still expected to occur, gains or losses that were accumulated in other comprehensive income are amortized into earnings over the same periods in which the hedged transactions will affect earnings.
Fair Value Measurement
Fair values of financial instruments are estimated using relevant market information and other assumptions, as more fully disclosed in Note 23 of these Notes to Consolidated Financial Statements. 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 401(k) plan expense is the amount of matching contributions. Deferred compensation and supplemental retirement plan expense allocates the benefits over years of service.
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.
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, The Park National Bank ("PNB") (headquartered in Newark, Ohio), SE Property Holdings, LLC ("SEPH"), and Guardian Financial Services Company ("GFSC").

Organization

Organization	12 Months Ended
	Dec. 31, 2014
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, Guardian Financial Services Company ("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, Vision surrendered its Florida banking charter to the Florida Office of Financial Regulation and became a non-bank Florida corporation. 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. Vision, with its two banking divisions, through February 16, 2012, provided the services mentioned above. See Note 25 of these Notes to Consolidated Financial Statements for financial information on the Corporation’s operating segments.

Sale_Of_Vision_Bank_Business

Sale Of Vision Bank Business	12 Months Ended
	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
Sale of Vision Bank Business	Sale of Vision Bank Business
	On February 16, 2012, Park and its wholly-owned subsidiary, Vision, completed their sale of substantially all of the performing loans, operating assets and liabilities associated with Vision to Centennial Bank (“Centennial”), an Arkansas state-chartered bank which is a wholly-owned subsidiary of Home BancShares, Inc. (“Home”), an Arkansas corporation, as contemplated by the previously announced Purchase and Assumption Agreement by and between Park, Vision, Home and Centennial, dated as of November 16, 2011, as amended by the First Amendment to Purchase and Assumption Agreement, dated as of January 25, 2012, and the Second Amendment to Purchase and Assumption Agreement, dated as of April 30, 2012 (collectively, the "Vision Purchase Agreement") for a purchase price of $27.9 million.
	Subsequent to the transactions contemplated by the Vision Purchase Agreement, Vision was left with approximately $22 million of performing loans (including mortgage loans held for sale) and non-performing loans with a fair value of $88 million. Park recorded a pre-tax gain, net of expenses directly related to the sale, of approximately $22.2 million, resulting from the transactions contemplated by the Vision Purchase Agreement. The pre-tax gain, net of expense is summarized in the table below:
	(In thousands)
	Premium paid	$	27,913
	One-time gains	298
	Loss on sale of fixed assets	(2,434		)
	Employment and severance agreements	(1,610		)
	Other one-time charges, including estimates	(2,000		)
	Pre-tax gain	$	22,167
	As part of the transaction between Vision and Centennial, Park agreed to allow Centennial to “put back” up to $7.5 million aggregate principal amount of loans, which were originally included within the loans sold in the transaction. The loan put option expired on August 16, 2012, 180 days after the closing of the transaction, which was February 16, 2012. Prior to August 16, 2012, Centennial notified Park of Centennial's intent to put back approximately $7.5 million aggregate principal amount of loans. During 2012, Centennial put back 44 loans, totaling approximately $7.5 million. These 44 loans were recorded on the books at a fair value of $4.2 million. The difference of $3.3 million was written off against the loan put liability that had previously been established in the first half of 2012.

Goodwill_Notes

Goodwill (Notes)	12 Months Ended
	Dec. 31, 2014
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, 2014, 2013 and 2012.
	(In thousands)	Goodwill		Core Deposit Intangibles			Total
	1-Jan-12	$	72,334	$	2,509		$	74,843
	Amortization	—		(2,172		)	(2,172		)
	December 31, 2012	$	72,334	$	337		$	72,671
	Amortization	—		(337		)	(337		)
	December 31, 2013	$	72,334	$	—		$	72,334
	Amortization	—		—			—
	December 31, 2014	$	72,334	$	—		$	72,334
	The core deposit intangibles were amortized to expense principally on the straight-line method, over a period of six years. The amortization period for the core deposit intangibles related to Vision Bank was accelerated in the first quarter of 2012 due to the pending sale of the Vision Bank business to Centennial Bank. Core deposit intangibles were fully amortized at December 31, 2013, and thus there was no amortization expense in 2014. Core deposit intangible amortization expense was $337,000 in 2013 and $2.2 million in 2012.

Investment_Securities

Investment Securities	12 Months Ended
	Dec. 31, 2014
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 2014, there were no investment securities deemed to be other-than-temporarily impaired. During 2013 and 2012, Park recognized other-than-temporary impairment charges of $17,000 and $54,000, respectively, related to an equity investment in a financial institution.
	Investment securities at December 31, 2014 and December 31, 2013 were as follows:
	(In thousands)	Amortized Cost		Gross Unrealized/Unrecognized Holding Gains		Gross Unrealized/Unrecognized Holding Losses		Estimated Fair Value
	2014:00:00
	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
	2014:00:00
	Securities Held-to-Maturity
	U.S. Government sponsored entities’ asset-backed securities	$	140,562	$	3,088	$	160	$	143,490
	Total	$	140,562	$	3,088	$	160	$	143,490
	(In thousands)	Amortized Cost		Gross Unrealized/Unrecognized Holding Gains		Gross Unrealized/Unrecognized Holding Losses		Estimated Fair Value
	2013:00:00
	Securities Available-for-Sale
	Obligations of U.S. Treasury and other U.S. Government sponsored entities	$	570,632	$	—	$	45,496	$	525,136
	U.S. Government sponsored entities’ asset-backed securities	650,391		8,070		9,990		648,471
	Other equity securities	1,120		1,539		—		2,659
	Total	$	1,222,143	$	9,609	$	55,486	$	1,176,266
	2013:00:00
	Securities Held-to-Maturity
	Obligations of states and political subdivisions	$	240	$	1	$	—	$	241
	U.S. Government sponsored entities’ asset-backed securities	181,821		5,382		42		187,161
	Total	$	182,061	$	5,383	$	42	$	187,402
	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, 2014, the amortized cost of Park’s available-for-sale mortgage-backed securities was $387.1 million and there were no held-to-maturity mortgage-backed securities within Park's investment portfolio. At December 31, 2014, the amortized cost of Park's available-for-sale and held-to-maturity CMOs was $364.9 million and $140.6 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, 2014 and December 31, 2013:
		Less than 12 Months				12 Months or Longer				Total
	(In thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
	2014:00:00
	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
	2014:00:00
	Securities Held-to-Maturity
	U.S. Government sponsored entities’ asset-backed securities	$	8,032	$	148	$	2,714	$	12	$	10,746	$	160
		Less than 12 Months				12 Months or Longer				Total
	(In thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
	2013:00:00
	Securities Available-for-Sale
	Obligations of U.S. Treasury and other U.S. Government sponsored entities	$	377,626	$	29,256	$	147,510	$	16,240	$	525,136	45,496
	U.S. Government sponsored entities' asset-backed securities	404,035		8,917		21,572		1,073		425,607		9,990
	Total	$	781,661	$	38,173	$	169,082	$	17,313	$	950,743	$	55,486
	2013:00:00
	Securities Held-to-Maturity
	U.S. Government sponsored entities' asset-backed securities	$	5,781	$	42	$	—	$	—	$	5,781	$	42
	Management does not believe any individual unrealized loss as of December 31, 2014 or 2013 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 and $59.0 million of FHLB stock and $8.2 million and $6.9 million of FRB stock at December 31, 2014 and December 31, 2013, respectively.
	During 2014, the FHLB elected to redeem 89,460 shares of FHLB stock for $8.9 million. There was no gain or loss resulting from this transaction. Additionally, during 2014, Park purchased 27,000 shares of FRB stock in order to maintain required stock levels. The FRB stock was purchased for a $1.4 million subscription price.
	The amortized cost and estimated fair value of investments in debt securities at December 31, 2014, are shown in the following table by contractual maturity or the expected call date, 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		Weighted Average Yield
	Securities Available-for-Sale
	U.S. Treasury and other U.S. Government sponsored entities’ notes:
	Due one through five years	30,000		30,011		2.1	%
	Due five through ten years	516,886		508,053		2.35	%
	Total	$	546,886	$	538,064	2.34	%
	U.S. Government sponsored entities’ asset-backed securities	$	751,974	$	761,153	2.36	%
	Securities Held-to-Maturity
	U.S. Government sponsored entities’ asset-backed securities	$	140,562	$	143,490	3.58	%
	Approximately $546.9 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 5 to 8 years. Of the $546.9 million reported at December 31, 2014, $30.0 million were expected to be called and are shown in the table at their expected call date.
	Investment securities having an amortized cost of $1,205 million and $1,321 million at December 31, 2014 and 2013, 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, 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, 2013, $639 million was pledged for government and trust department deposits, $648 million was pledged to secure repurchase agreements and $34 million was pledged as collateral for FHLB advance borrowings.
At December 31, 2014, 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 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. During 2012, Park had no sales of investment securities.

Loans

Loans	12 Months Ended
	Dec. 31, 2014
Loans and Leases Receivable Disclosure [Abstract]
Loans	Loans
	The composition of the loan portfolio, by class of loan, as of December 31, 2014 and December 31, 2013 was as follows:
		12/31/14										12/31/13
	(In thousands)	Loan Balance			Accrued Interest Receivable			Recorded Investment				Loan Balance			Accrued Interest Receivable		Recorded Investment
	Commercial, financial and agricultural *	$	856,535		$	3,218		$	859,753			$	825,432		$	3,079	$	828,511
	Commercial real estate *	1,069,637			3,546			1,073,183				1,112,273			3,765		1,116,038
	Construction real estate:
	SEPH commercial land and development *	2,195			—			2,195				5,846			2		5,848
	Remaining commercial	115,139			300			115,439				110,842			263		111,105
	Mortgage	31,148			72			31,220				31,882			96		31,978
	Installment	7,322			23			7,345				7,546			26		7,572
	Residential real estate:
	Commercial	417,612			1,038			418,650				407,387			904		408,291
	Mortgage	1,189,709			1,548			1,191,257				1,144,754			1,559		1,146,313
	HELOC	216,915			803			217,718				213,565			870		214,435
	Installment	27,139			97			27,236				33,841			132		33,973
	Consumer	893,160			2,967			896,127				723,733			2,775		726,508
	Leases	3,171			17			3,188				3,404			23		3,427
	Total loans	$	4,829,682		$	13,629		$	4,843,311			$	4,620,505		$	13,494	$	4,633,999
	* Included within commercial, financial and agricultural loans, commercial real estate loans, and SEPH commercial land and development loans were 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 $9.4 million at December 31, 2014 and $7.3 million at December 31, 2013, which represented a net deferred income position in both years.
	Overdrawn deposit accounts of $2.3 million and $3.3 million have been reclassified to loans at December 31, 2014 and 2013, respectively.
	Credit Quality
	The following table presents the recorded investment in nonaccrual loans, accruing troubled debt restructurings, and loans past due 90 days or more and still accruing by class of loan as of December 31, 2014 and December 31, 2013:
		12/31/14
	(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
		12/31/13
	(In thousands)	Nonaccrual Loans			Accruing Troubled Debt Restructurings			Loans Past Due 90 Days or More and Accruing			Total Nonperforming Loans
	Commercial, financial and agricultural	$	20,633		$	107		$	80		$	20,820
	Commercial real estate	39,588			2,234			2			41,824
	Construction real estate:
	SEPH commercial land and development	4,777			—			—			4,777
	Remaining commercial	10,476			306			—			10,782
	Mortgage	87			97			—			184
	Installment	39			192			—			231
	Residential real estate:
	Commercial	32,495			913			—			33,408
	Mortgage	20,564			11,708			549			32,821
	HELOC	2,129			751			—			2,880
	Installment	965			885			80			1,930
	Consumer	3,463			1,616			1,016			6,095
	Total loans	$	135,216		$	18,809		$	1,727		$	155,752
	The following table provides additional information regarding those nonaccrual and accruing troubled debt restructured loans that are individually evaluated for impairment and those collectively evaluated for impairment as of December 31, 2014 and December 31, 2013.
		12/31/14										12/31/13
		Nonaccrual and accruing troubled debt restructurings			Loans individually evaluated for impairment			Loans collectively evaluated for impairment				Nonaccrual and accruing troubled debt restructurings			Loans individually evaluated for impairment		Loans collectively evaluated for impairment
	(In thousands)
	Commercial, financial and agricultural	$	19,123		$	19,106		$	17			$	20,740		$	20,727	$	13
	Commercial real estate	21,989			21,989			—				41,822			41,822		—
	Construction real estate:
	SEPH commercial land and development	2,078			2,078			—				4,777			4,777		—
Remaining commercial	5,609			5,609			—				10,782			10,782		—
Mortgage	153			—			153				184			—		184
Installment	240			—			240				231			—		231
Residential real estate:
Commercial	24,930			24,930			—				33,408			33,408		—
Mortgage	32,218			—			32,218				32,272			—		32,272
HELOC	2,509			—			2,509				2,880			—		2,880
Installment	2,522			—			2,522				1,850			—		1,850
Consumer	5,354			—			5,354				5,079			799		4,280
Total loans	$	116,725		$	73,712		$	43,013			$	154,025		$	112,315	$	41,710
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, 2014 and December 31, 2013.
	12/31/14										12/31/13
(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	$	30,601		$	17,883		$	—			$	22,429		$	12,885	$	—
Commercial real estate	27,923			20,696			—				56,870			34,149		—
Construction real estate:
SEPH commercial land and development	11,026			2,078			—				23,722			4,777		—
Remaining commercial	1,427			391			—				8,429			6,872		—
Residential real estate:
Commercial	25,822			23,352			—				36,709			31,461		—
Consumer	—			—			—				799			799		—
With an allowance recorded
Commercial, financial and agricultural	1,251			1,223			981				12,616			7,842		3,268
Commercial real estate	1,310			1,293			262				7,966			7,673		5,496
Construction real estate:
Remaining commercial	5,218			5,218			1,812				3,909			3,910		1,132
Residential real estate:
Commercial	1,578			1,578			605				2,129			1,947		555
Consumer	—			—			—				—			—		—
Total	$	106,156		$	73,712		$	3,660			$	175,578		$	112,315	$	10,451
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, 2014 and December 31, 2013, there were $32.4 million and $58.1 million, respectively, of partial charge-offs on loans individually evaluated for impairment with no related allowance recorded and $45,000 and $5.2 million, 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, 2014 and 2013, of $3.7 million and $10.5 million, respectively. These loans with specific reserves had a recorded investment of $9.3 million and $21.4 million as of December 31, 2014 and 2013, 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, 2014, 2013, and 2012:
				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
				Year ended
				31-Dec-12
(In thousands)	Recorded Investment as of December 31, 2012			Average recorded investment			Interest income recognized
Commercial, financial and agricultural	$	22,587		$	35,305		$	529
Commercial real estate	44,278			44,541			968
Construction real estate:
SEPH commercial land and development	13,260			17,277			—
Remaining commercial	21,574			27,774			818
Residential real estate:
Commercial	35,622			39,248			497
Consumer	18			19			1
Total	$	137,339		$	164,164		$	2,813
The following tables present the aging of the recorded investment in past due loans as of December 31, 2014 and December 31, 2013 by class of loan.
	12/31/14
(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.
	12/31/13
(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	$	1,233		$	13,275		$	14,508		$	814,003		$	828,511
Commercial real estate	2,168			18,274			20,442			1,095,596			1,116,038
Construction real estate:
SEPH commercial land and development	—			4,242			4,242			1,606			5,848
Remaining commercial	—			3,463			3,463			107,642			111,105
Mortgage	264			75			339			31,639			31,978
Installment	207			14			221			7,351			7,572
Residential real estate:
Commercial	900			5,659			6,559			401,732			408,291
Mortgage	13,633			11,829			25,462			1,120,851			1,146,313
HELOC	571			402			973			213,462			214,435
Installment	696			436			1,132			32,841			33,973
Consumer	12,143			3,941			16,084			710,424			726,508
Leases	—			—			—			3,427			3,427
Total loans	$	31,815		$	61,610		$	93,425		$	4,540,574		$	4,633,999
* Includes $1.7 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, 2014 and 2013 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 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 the institution’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, 2014 and December 31, 2013 for all commercial loans:
	12/31/14
(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, commercial real estate loans, and SEPH commercial land and development loans was an immaterial amount of consumer loans that were not broken out by class.
	12/31/13
(In thousands)	5 Rated			6 Rated			Impaired			Pass Rated			Recorded Investment
Commercial, financial and agricultural*	$	6,055		$	532		$	20,740		$	801,184		$	828,511
Commercial real estate*	11,591			1,525			41,822			1,061,100			1,116,038
Construction real estate:
SEPH commercial land and development*	354			—			4,777			717			5,848
Remaining commercial	6,858			244			10,782			93,221			111,105
Residential real estate:
Commercial	5,033			397			33,408			369,453			408,291
Leases	—			—			—			3,427			3,427
Total Commercial Loans	$	29,891		$	2,698		$	111,529		$	2,329,102		$	2,473,220
* Included within commercial, financial and agricultural loans, commercial real estate loans, and SEPH commercial land and development loans was an immaterial amount of consumer loans that were not broken out by class.
Troubled Debt Restructuring (TDRs)
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. Certain loans which were modified during the years ended December 31, 2014 and December 31, 2013 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, 2014 and 2013, Park removed the TDR classification on $2.5 million and $7.7 million, respectively, of loans that met the requirements discussed above.
At December 31, 2014 and 2013, there were $47.5 million and $76.3 million, respectively, of TDRs included in the nonaccrual loan totals. At December 31, 2014 and 2013, $15.7 million and $50.6 million of these nonaccrual TDRs were performing in accordance with the terms of the restructured note. As of December 31, 2014 and 2013, there were $16.3 million and $18.8 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, 2014 and 2013, Park had commitments to lend $1.4 million and $4.0 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, 2014 and 2013 was $2.4 million and $7.5 million, respectively. Modifications made in 2013 and 2014 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 $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, 2014 and 2013 that did not meet the definition of a TDR. Modified/renewed substandard commercial loans which did not meet the definition of a TDR had a total recorded investment as of December 31, 2014 and 2013 of $987,000 and $878,000, 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, 2014 and 2013 of $19.9 million and $24.2 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, 2014 and 2013 as well as the recorded investment of these contracts at December 31, 2014 and 2013. The recorded investment pre- and post-modification is generally the same due to the fact that Park does not typically provide for forgiveness of principal.
	Year ended
	31-Dec-14
(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
	31-Dec-13
(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, 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, 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					Year ended
	31-Dec-14					31-Dec-13
(In thousands)	Number of Contracts		Recorded Investment			Number of Contracts			Recorded Investment
Commercial, financial and agricultural	4		$	206		11			$	771
Commercial real estate	1		302			11			2,839
Construction real estate:
SEPH commercial land and development	—		—			—			—
Remaining commercial	—		—			—			—
Mortgage	—		—			—			—
Installment	—		—			1			10
Residential real estate:
Commercial	1		3			4			1,683
Mortgage	14		810			26			1,533
HELOC	2		160			—			—
Installment	2		12			5			72
Consumer	62		516			74			471
Leases	—		—			—			—
Total loans	86		$	2,009		$	132		$	7,379
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.
Management transfers a loan to OREO at the time that Park takes deed/title of the asset. At December 31, 2014 and 2013, Park had $22.6 million and $34.6 million, respectively, of OREO.
Certain of the Corporation’s executive officers, directors and related entities of directors are loan customers of PNB. As of December 31, 2014 and 2013, credit exposure aggregating approximately $45.7 million and $49.7 million, respectively, was outstanding to such parties. Of this total exposure, approximately $36.0 million and $37.7 million were outstanding at December 31, 2014 and 2013, respectively, with the remaining balance representing available credit. During 2014, new loans and advances on existing loans were made to these executive officers, directors and related entities totaling $6.0 million and $6.4 million, respectively. These extensions of credit were offset by payments of $14.1 million. During 2013, new loans and advances on existing loans were $547,000 and $11.9 million, respectively. These extensions of credit were offset by payments of $10.0 million.

Allowance_for_Loan_Losses

Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2014
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 of these Notes to Consolidated Financial Statements.
	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 period compared to the 2012 and 2013 periods.
	With the inclusion of 2014 net charge-off information in the fourth quarter of 2014, management extended the historical loss period to six years. Due to the same factors that management considered in 2013, management applied more weight to the 2009 through 2011 periods compared to the 2012 through 2014 periods.
	The activity in the allowance for loan losses for the years ended December 31, 2014, 2013, and 2012 is summarized in the following tables.
		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
		Year ended December 31, 2012
	(In thousands)	Commercial, financial and agricultural			Commercial real estate			Construction real estate			Residential real estate			Consumer			Leases			Total
	Allowance for credit losses:
	Beginning balance	$	16,950		$	15,539		$	14,433		$	15,692		$	5,830		$	—		$	68,444
	Charge-offs	26,847			10,454			9,985			8,607			5,375			—			61,268
	Recoveries	(1,066		)	(783		)	(2,979		)	(5,559		)	(2,555		)	—			(12,942		)
	Net charge-offs	25,781			9,671			7,006			3,048			2,820			—			48,326
	Provision (Recovery)	24,466			5,868			(586		)	2,115			3,556			—			35,419
	Ending balance	$	15,635		$	11,736		$	6,841		$	14,759		$	6,566		—			$	55,537
	Loans collectively evaluated for impairment in the following tables include all performing loans at December 31, 2014 and 2013, 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, 2014 and 2013, which are evaluated for impairment in accordance with GAAP (see Note 1 of these Notes to Consolidated Financial Statements).
	The composition of the allowance for loan losses at December 31, 2014 and 2013 was as follows:
		31-Dec-14
	(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		%	0.8		%	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
		31-Dec-13
	(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	$	3,268		$	5,496		$	1,132		$	555		$	—		$	—		$	10,451
	Collectively evaluated for impairment	10,950			10,403			5,723			13,696			8,245			—			49,017
	Total ending allowance balance	$	14,218		$	15,899		$	6,855		$	14,251		$	8,245		$	—		$	59,468
	Loan Balance:
	Loans individually evaluated for impairment	$	20,724		$	41,816		$	15,559		$	33,406		$	799		$	—		$	112,304
	Loans collectively evaluated for impairment	804,708			1,070,457			140,557			1,766,141			722,934			3,404			4,508,201
Total ending loan balance	$	825,432		$	1,112,273		$	156,116		$	1,799,547		$	723,733		$	3,404		$	4,620,505
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment	15.77		%	13.14		%	7.28		%	1.66		%	—		%	—		%	9.31		%
Loans collectively evaluated for impairment	1.36		%	0.97		%	4.07		%	0.78		%	1.14		%	—		%	1.09		%
Total	1.72		%	1.43		%	4.39		%	0.79		%	1.14		%	—		%	1.29		%
Recorded Investment:
Loans individually evaluated for impairment	$	20,727		$	41,822		$	15,559		$	33,408		$	799		$	—		$	112,315
Loans collectively evaluated for impairment	807,784			1,074,216			140,944			1,769,604			725,709			3,427			4,521,684
Total recorded investment	$	828,511		$	1,116,038		$	156,503		$	1,803,012		$	726,508		$	3,427		$	4,633,999

Loans_Held_for_Sale_Notes

Loans Held for Sale (Notes)	12 Months Ended
	Dec. 31, 2014
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 $5.3 million and $1.7 million at December 31, 2014 and 2013, respectively. These amounts are included in loans on the Consolidated Balance Sheets and in the residential real estate loan segments in Note 7 and Note 8. The contractual balance was $5.2 million and $1.6 million at December 31, 2014 and 2013, respectively. The gain expected upon sale was $80,000 and $28,000 at December 31, 2014 and 2013, respectively. None of these loans were 90 days or more past due or on nonaccrual status as of December 31, 2014 or 2013.
	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.

Premises_And_Equipment

Premises And Equipment	12 Months Ended
	Dec. 31, 2014
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)	2014			2013
	Land	$	17,836		$	17,657
	Buildings	71,002			70,183
	Equipment, furniture and fixtures	42,139			36,937
	Leasehold improvements	3,439			3,903
	Total	$	134,416		$	128,680
	Less accumulated depreciation	(78,937		)	(73,402		)
	Premises and equipment, net	$	55,479		$	55,278
	Depreciation expense amounted to $7.2 million, $7.3 million and $7.0 million for the years ended December 31, 2014, 2013 and 2012, 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)
	2015	1,143
	2016	755
	2017	559
	2018	448
	2019	367
	Thereafter	252
	Total	$	3,524
	Rent expense for Park was $1.7 million, $1.8 million and $1.9 million, for the years ended December 31, 2014, 2013 and 2012, respectively.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2014
Deposits [Abstract]
Deposits	Deposits
	At December 31, 2014 and 2013, non-interest bearing and interest bearing deposits were as follows:
	December 31 (In thousands)	2014			2013
	Non-interest bearing	$	1,269,296		$	1,193,553
	Interest bearing	3,858,704			3,596,441
	Total	$	5,128,000		$	4,789,994
	At December 31, 2014, the maturities of time deposits were as follows:
	(In thousands)
	2015	$	823,230
	2016	254,565
	2017	145,321
	2018	42,160
	2019	144,133
	After 5 years	502
	Total	$	1,409,911
	At December 31, 2014 and 2013, respectively, Park had approximately $21.9 million and $18.4 million of deposits received from executive officers, directors and their related entities.
	Maturities of time deposits over $100,000 and $250,000 as of December 31, 2014 were:
	December 31 (In thousands)	Over $100,000		Over $250,000
	3 months or less	$	210,386	$	18,927
	Over 3 months through 6 months	93,168		11,954
	Over 6 months through 12 months	132,344		10,470
	Over 12 months	323,295		223,892
	Total	$	759,193	$	265,243

ShortTerm_Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2014
Short-term Debt [Abstract]
Short-Term Borrowings	Short-Term Borrowings
	Short-term borrowings were as follows:
	December 31 (In thousands)	2014			2013
	Securities sold under agreements to repurchase and federal funds purchased	$	276,980		$	242,029
	FHLB advances	—			—
	Total short-term borrowings	$	276,980		$	242,029
	The outstanding balances for all short-term borrowings as of December 31, 2014 and 2013 and the weighted-average interest rates as of and paid during each of the years then ended were as follows:
	(In thousands)	Repurchase agreements and Federal Funds Purchased			FHLB Advances
	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		%	0.1		%
	2013
	Ending balance	$	242,029		$	—
	Highest month-end balance	280,863			—
	Average daily balance	251,868			1,255
	Weighted-average interest rate:
	As of year-end	0.19		%	—		%
	Paid during the year	0.21		%	0.41		%
	During 2013 and 2014, 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.
	See Note 6 of these Notes to Consolidated Financial Statements for the amount of investment securities that are pledged. At December 31, 2014 and 2013, $2,038 million and $2,072 million, respectively, of commercial real estate and residential mortgage loans were pledged under a blanket agreement to the FHLB by Park’s bank subsidiary.
	Note 6 states that $664 million and $648 million of securities were pledged to secure repurchase agreements as of December 31, 2014 and 2013, respectively. Park’s repurchase agreements in short-term borrowings consist of customer accounts and securities which are pledged on an individual security basis. Park’s repurchase agreements with a third-party financial institution are classified as long-term debt. See Note 13 of these Notes to Consolidated Financial Statements.

LongTerm_Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt
	Long-term debt is listed below:
	December 31,	2014					2013
	(In thousands)	Outstanding Balance			Average Rate		Outstanding Balance			Average Rate
	Total Federal Home Loan Bank advances by year of maturity:
	2014	—			—	%	100,500			1.51	%
	2015	51,000			2	%	51,000			2	%
	2016	26,000			0.92	%	26,000			0.92	%
	2017	51,000			1.28	%	51,000			3.37	%
	2018	125,049			2.11	%	125,062			2.11	%
	2019	75,333			1.97	%	25,415			1.94	%
	Thereafter	176,161			3.16	%	151,330			3.33	%
	Total	$	504,543		2.3	%	530,307			2.39	%
	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:
	2014	—			—	%	100,500			1.51	%
	2015	51,000			2	%	51,000			2	%
	2016	26,000			0.92	%	26,000			0.92	%
	2017	351,000			1.68	%	351,000			1.99	%
	2018	125,049			2.11	%	125,062			2.11	%
	2019	75,333			1.97	%	25,415			1.94	%
	Thereafter	176,161			3.16	%	151,330			3.33	%
	Total	$	804,543		2.09	%	$	830,307		2.16	%
	Prepayment penalty	(17,941		)	—		(19,766		)	—
	Total long-term debt	$	786,602		2.89	%	$	810,541		2.79	%
	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, $14.8 million remained to be amortized as of December 31, 2014. The remaining amortization will be $5.0 million in 2015, $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, $3.1 million remained to be amortized as of December 31, 2014. The remaining amortization will be $1.0 million in 2015, $1.1 million in 2016, and $1.0 million in 2017.
	Park had approximately $176.2 million of long-term debt at December 31, 2014 with a contractual maturity longer than five years. However, approximately $150 million of this debt is callable by the issuer in 2015.
	At December 31, 2014 and 2013, 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.
	See Note 6 of these Notes to Consolidated Financial Statements for the amount of investment securities that were pledged. See Note 12 of these Notes to Consolidated Financial Statements for the amount of commercial real estate and residential mortgage loans that were pledged to the FHLB at December 31, 2014 and December 31, 2013.

Subordinated_DebenturesNotes

Subordinated Debentures/Notes	12 Months Ended
	Dec. 31, 2014
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 a 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.
	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.

ShareBased_Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Option Plan	Share-Based Compensation
	The Park National Corporation 2005 Incentive Stock Option Plan (the “2005 Plan”) was adopted by the Board of Directors of Park on January 18, 2005, and was approved by Park's shareholders at the Annual Meeting of Shareholders on April 18, 2005. Under the 2005 Plan, 1,500,000 common shares were authorized for delivery upon the exercise of incentive stock options. All of the common shares delivered upon the exercise of incentive stock options granted under the 2005 Plan were to be treasury shares. The 2005 Plan was terminated on April 22, 2013 and no common shares were delivered thereunder.
	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 replaces the 2005 Plan and Park's Stock Plan for Non-Employee Directors of Park National Corporation and Subsidiaries (the "Directors' Stock Plan") which were terminated immediately following the approval of the 2013 Incentive Plan. 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 appreciations rights, restricted common shares, restricted stock 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 granted. 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, 2014, 557,275 common shares were available for future grants under the 2013 Incentive Plan.
	During 2014 and 2013, Park granted 10,200 and 10,550 common shares, respectively, to directors under the 2013 Incentive Plan. The common shares granted to directors were not subjected to a vesting period and resulted in expense of $801,000 and $850,000 in 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 21,975 performance-based restricted stock units (“PBRSUs”) to certain employees of Park, which grants were effective on January 24, 2014. The number of PBRSUs earned or settled will depend on certain performance conditions and are also subject to service-based vesting. Share-based compensation expense of $458,000 was recognized in 2014 related to awards to employees. Park expects to recognize additional share-based compensation expense of approximately $1.2 million through the first quarter of 2018 related to these PBRSUs. No share-based compensation expense was recognized in 2013 or 2012 as there were no outstanding awards held by employees.

Benefit_Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2014
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.
	The Corporation generally contributes annually an amount that can be deducted for federal income tax purposes using a different actuarial cost method and different assumptions from those used for financial reporting purposes. In January 2013, management contributed $12.6 million, of which $11.0 million was deductible on the 2012 tax return and $1.6 million was deductible on the 2013 tax return. See Note 17 of these Notes to Consolidated Financial Statements. There was no pension contribution in 2014 and there is no contribution expected in 2015.
	Using an accrual measurement date of December 31, 2014 and 2013, plan assets and benefit obligation activity for the Pension Plan are listed below:
	(In thousands)		2014				2013
	Change in fair value of plan assets
	Fair value at beginning of measurement period		$	152,739			$	117,768
	Actual return on plan assets		15,511				31,518
	Company contributions		—				12,638
	Benefits paid		(7,652		)		(9,185		)
	Fair value at end of measurement period		$	160,598			$	152,739
	Change in benefit obligation
	Projected benefit obligation at beginning of measurement period		$	89,179			$	97,653
	Service cost		4,331				4,817
	Interest cost		4,577				4,223
	Actuarial (gains) loss		18,893				(8,329		)
	Benefits paid		(7,652		)		(9,185		)
	Projected benefit obligation at the end of measurement period		$	109,328			$	89,179
	Funded status at end of year (fair value of plan assets less benefit obligation)		$	51,270			$	63,560
	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		2014			2013
	Equity securities		50% - 100%		85	%		83	%
	Fixed income and cash equivalents		remaining balance		15	%		17	%
	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, 2014 and 2013. 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 $92.0 million and $75.9 million at December 31, 2014 and 2013, 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, 2014 and 2013, the fair value of the 115,800 common shares held by the Pension Plan was $10.2 million, or $88.48 per share and $9.9 million, or $85.07 per share, respectively.
	The weighted average assumptions used to determine benefit obligations at December 31, 2014, 2013 and 2012 were as follows:
			2014			2013			2012
	Discount rate		4.42	%		5.3	%		4.47	%
	Rate of compensation increase								3	%
	Under age 30		10	%		10	%
	Ages 30-39		6	%		6	%
	Ages 40 and over		3	%		3	%
	The estimated future pension benefit payments reflecting expected future service for the next ten years are shown below (in thousands):
	2015	$	6,282
	2016	6,236
	2017	6,902
	2018	7,081
	2019	7,799
	2020-2024	46,850
	Total	$	81,150
	The following table shows ending balances of accumulated other comprehensive loss at December 31, 2014 and 2013.
	(In thousands)		2014				2013
	Prior service cost		$	(15	)		$	(34	)
	Net actuarial loss		(22,855		)		(8,579		)
	Total		(22,870		)		(8,613		)
	Deferred taxes		8,005				3,015
	Accumulated other comprehensive loss		$	(14,865	)		$	(5,598	)
	Using an actuarial measurement date of December 31 for 2014, 2013 and 2012, components of net periodic benefit cost and other amounts recognized in other comprehensive (loss) income were as follows:
	(In thousands)		2014				2013				2012
	Components of net periodic benefit cost and other amounts recognized in other comprehensive (loss) income
	Service cost		$	(4,331	)		$	(4,817	)		$	(4,271	)
	Interest cost		(4,577		)		(4,223		)		(4,048		)
	Expected return on plan assets		10,869				9,536				8,742
	Amortization of prior service cost		(19		)		(20		)		(20		)
	Recognized net actuarial loss		—				(2,703		)		(1,708		)
	Net periodic benefit income (cost)		$	1,942			$	(2,227	)		$	(1,305	)
	Change to net actuarial (loss) gain for the period		$	(14,276	)		$	30,409			$	(11,236	)
	Amortization of prior service cost		19				20				20
	Amortization of net loss		—				2,703				1,708
	Total recognized in other comprehensive (loss) income		(14,257		)		33,132				(9,508		)
Total recognized in net benefit cost and other comprehensive (loss) income		$	(12,315	)		$	30,905			$	(10,813	)
The estimated prior service costs for the Pension Plan that will be amortized from accumulated other comprehensive loss into net periodic benefit cost over the next fiscal year is $15,000. The estimated net actuarial loss expected to be recognized in the next fiscal year is $637,000.
The weighted average assumptions used to determine net periodic benefit cost for the years ended December 31, 2014, 2013 and 2012 are listed below:
		2014			2013			2012
Discount Rate		5.3	%		4.47	%		5.18	%
Rate of compensation increase								3	%
Under age 30		10	%		10	%
Ages 30-39		6	%		6	%
Ages 40 and over		3	%		3	%
Expected long-term return on plan assets		7.25	%		7.5	%		7.75	%
The Pension Plan maintains cash in a PNB savings account. The Pension Plan cash balance was $1.9 million at December 31, 2014.
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, 2014 was $160.6 million. At December 31, 2014, $141.1 million of equity investments and cash in the Pension Plan were categorized as Level 1 inputs; $19.5 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 $152.7 million at December 31, 2013. At December 31, 2013, $128.7 million of investments in the Pension Plan were categorized as Level 1 inputs; $24.0 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 $1.1 million, $1.1 million, and $1.0 million for 2014, 2013 and 2012, respectively.
The Corporation has a Supplemental Executive Retirement Plan (SERP) covering certain key officers of the Corporation and its subsidiaries with defined pension benefits in excess of limits imposed by federal tax law. The accrued benefit cost for the SERP totaled $7.6 million and $6.8 million for 2014 and 2013, respectively. The expense for the Corporation was $0.2 million for 2014, $0.2 million for 2013 and $0.3 million for 2012.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
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)	2014				2013
	Deferred tax assets:
	Allowance for loan losses	$	19,023			$	20,814
	Accumulated other comprehensive loss – Pension Plan	8,005				3,015
	Accumulated other comprehensive loss – Unrealized losses on securities	—				16,057
	Intangible assets	543				673
	Deferred compensation	3,820				3,611
	OREO devaluations	3,984				5,287
	Partnership adjustments	4,725				3,793
	Net deferred loan fees	933				282
	Other	3,795				3,423
	Total deferred tax assets	$	44,828			$	56,955
	Deferred tax liabilities:
	Accumulated other comprehensive income – Unrealized gains on securities	677				—
	Deferred investment income	10,199				10,199
	Pension Plan	25,949				25,261
	Mortgage servicing rights	3,015				3,154
	Other	804				850
	Total deferred tax liabilities	$	40,644			$	39,464
	Net deferred tax assets	$	4,184			$	17,491
	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, 2014 or 2013 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)	2014				2013				2012
	Currently payable
	Federal	$	27,039			$	27,587			$	12,984
	Deferred
	Federal	1,563				(2,456		)		12,717
	Total	28,602				25,131				25,701
	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, 2014, 2013 and 2012.
		2014			2013			2012
	Statutory federal corporate tax rate	35	%		35	%		35	%
	Changes in rates resulting from:
	Tax exempt interest income, net of disallowed interest	(0.5	)%		(0.8	)%		(0.9	)%
	Bank owned life insurance	(1.5	)%		(1.7	)%		(1.6	)%
	Tax credits (low income housing)	(6.3	)%		(6.6	)%		(6.1	)%
	Other	(1.3	)%		(1.3	)%		(1.8	)%
	Effective tax rate	25.4	%		24.6	%		24.6	%
	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)	2014				2013				2012
	January 1 Balance	$	518			$	517			$	485
	Additions based on tax positions related to the current year	76				74				74
	Additions for tax positions of prior years	14				4				25
	Reductions for tax positions of prior years	—				—				—
	Reductions due to statute of limitations	(76		)		(77		)		(67		)
	December 31 Balance	$	532			$	518			$	517
	The amount of unrecognized tax benefits that, if recognized, would favorably affect the effective income tax rate in the future periods at December 31, 2014, 2013 and 2012 was $413,000, $403,000 and $404,000, 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, 2013 and 2012 was $(500) and $4,500, 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, 2014, 2013 and 2012 was $67,000, $67,000 and $67,500, 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, 2011 are closed to examination by the federal and state taxing authorities.

Other_Comprehensive_Income_Los

Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2014
Other Comprehensive Income (Loss) [Abstract]
Other Comprehensive Income (Loss)	Other comprehensive income (loss) components, net of tax, are shown in the following table for the years ended December 31, 2014, 2013 and 2012.
	Year ended December 31,		Changes in Pension Plan assets and benefit obligations				Unrealized gains and losses on available-for-sale securities				Unrealized net holding loss on cash flow hedge			Total
	(in thousands)
	Beginning balance at December 31, 2013		$	(5,598	)		$	(29,821	)		$	—		$	(35,419	)
		Other comprehensive gain (loss) before reclassifications	(9,279		)		30,325				—			$	21,046
		Amounts reclassified from accumulated other comprehensive income	12				753				—			$	765
	Net current period other comprehensive income (loss)		(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 income	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	)
	Beginning balance at December 31, 2011		$	(20,954	)		$	12,673			$	(550	)	$	(8,831	)
		Net current period other comprehensive income (loss)	(6,180		)		(3,057		)		550			$	(8,687	)
	Ending balance at December 31, 2012		$	(27,134	)		$	9,616			$	—		$	(17,518	)
	Other Comprehensive Income (Loss)
	Other comprehensive income (loss) components, net of tax, are shown in the following table for the years ended December 31, 2014, 2013 and 2012.
	Year ended December 31,		Changes in Pension Plan assets and benefit obligations				Unrealized gains and losses on available-for-sale securities				Unrealized net holding loss on cash flow hedge			Total
	(in thousands)
	Beginning balance at December 31, 2013		$	(5,598	)		$	(29,821	)		$	—		$	(35,419	)
		Other comprehensive gain (loss) before reclassifications	(9,279		)		30,325				—			$	21,046
		Amounts reclassified from accumulated other comprehensive income	12				753				—			$	765
	Net current period other comprehensive income (loss)		(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 income	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	)
	Beginning balance at December 31, 2011		$	(20,954	)		$	12,673			$	(550	)	$	(8,831	)
		Net current period other comprehensive income (loss)	(6,180		)		(3,057		)		550			$	(8,687	)
	Ending balance at December 31, 2012		$	(27,134	)		$	9,616			$	—		$	(17,518	)
	The following table provides information concerning amounts reclassified out of accumulated other comprehensive income (loss) for the years ended December 31, 2014 and 2013:
			Amount Reclassified from Accumulated Other Comprehensive Income (Loss)							Affected Line Item in the Consolidated Statement of Income
	(in thousands)		2014			2013
	Amortization of defined benefit pension items
		Amortization of prior service cost	$	19		$	20			Salaries and employee benefits
		Amortization of net loss	—			2,703				Salaries and employee benefits
	Total income before income taxes		19			2,723				Total income before income taxes
		Federal income taxes	7			953				Federal income taxes
		Net of tax	$	12		$	1,770			Net of tax
	Unrealized gains & losses on available for sale securities
		Loss on sale of investment securities	$	1,158		$	—			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, 2014
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, warrants and convertible securities.
	The following table sets forth the computation of basic and diluted earnings per common share:
	Year ended December 31	2014		2013		2012
	(In thousands, except share data)
	Numerator:
	Net income available to common shareholders	$	84,090	$	77,227	$	75,205
	Denominator:
	Basic earnings per common share:
	Weighted-average shares	15,394,971		15,412,365		15,407,078
	Effect of dilutive securities – restricted stock units and warrants	18,861		—		1,063
	Diluted earnings per common share:
	Adjusted weighted-average shares and assumed conversions	15,413,832		15,412,365		15,408,141
	Earnings per common share:
	Basic earnings per common share	$	5.46	$	5.01	$	4.88
	Diluted earnings per common share	$	5.46	$	5.01	$	4.88
	On January 24, 2014, Park awarded 21,975 performance-based restricted stock units ("PBRSUs") to certain employees. The PBRSUs vest based on service and performance conditions. The dilutive effect of the PBRSUs was the addition of 18,861 common shares for the year ended December 31, 2014.
	A warrant to purchase 227,376 common shares was outstanding at December 31, 2011 as a result of Park’s participation in the U.S. Treasury Capital Purchase Program ("CPP"). Park repurchased the CPP warrant on May 2, 2012. The warrant to purchase 227,376 common shares issued under the CPP were included in the computation of diluted earnings per common share for the year ended December 31, 2012 as the dilutive effect of this warrant was 1,063 common shares for the twelve month period ended December 31, 2012. The exercise price of the CPP warrant to purchase 227,376 common shares was $65.97.
	All options under Park's 2005 Plan had expired by December 31, 2012. The common shares represented by the options for the twelve months ended December 31, 2012, totaling 63,308, were not included in the computation of diluted earnings per common share because the exercise price exceeded the fair value of the underlying common shares such that their inclusion would have had an anti-dilutive effect.

Dividend_Restrictions

Dividend Restrictions	12 Months Ended
	Dec. 31, 2014
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, 2014, approximately $86.7 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, 2014
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)	2014		2013
	Loan commitments	$	885,052	$	821,795
	Standby letters of credit	12,473		20,590
	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, 2014
Transfers and Servicing of Financial Assets [Abstract]
Loan Servicing	Loan Servicing
	Park serviced sold mortgage loans of $1,265 million at December 31, 2014, compared to $1,326 million at December 31, 2013 and $1,311 million at December 31, 2012. At December 31, 2014, $7.0 million of the sold mortgage loans were sold with recourse compared to $10.7 million at December 31, 2013. Management closely monitors the delinquency rates on the mortgage loans sold with recourse. As of December 31, 2014 and 2013, management had established a reserve of $379,000 and $1.0 million, 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)	2014			2013			2012
	Mortgage servicing rights:
	Carrying amount, net, beginning of year	$	9,013		$	7,763		$	9,301
	Additions	1,026			2,436			3,399
	Amortization	(1,631		)	(2,479		)	(3,634		)
	Change in valuation allowance	205			1,293			(1,303		)
	Carrying amount, net, end of year	$	8,613		$	9,013		$	7,763
	Valuation allowance:
	Beginning of year	$	1,031		$	2,324		$	1,021
	Change in valuation allowance	(205		)	(1,293		)	1,303
	End of year	$	826		$	1,031		$	2,324
	The fair value of mortgage servicing rights was $9.1 million and $9.5 million at December 31, 2014 and 2013, respectively. 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%. The fair value of mortgage servicing rights at December 31, 2013 was established using a discount rate of 10% and constant prepayment speeds ranging from 6.6% to 22.5%.
	Servicing fees included in other service income were $3.5 million, $3.6 million and $3.6 million for the years ended December 31, 2014, 2013 and 2012, respectively.

Fair_Values

Fair Values	12 Months Ended
	Dec. 31, 2014
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, 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
	Fair Value Measurements at December 31, 2013 using:
	(In thousands)		Level 1			Level 2			Level 3		Balance at December 31, 2013
	Assets
	Investment securities:
	Obligations of U.S. Treasury and other U.S. Government sponsored entities		$	—		$	525,136		$	—	$	525,136
	U.S. Government sponsored entities’ asset-backed securities		—			648,471			—		648,471
	Equity securities		1,900			—			759		2,659
	Mortgage loans held for sale		—			1,666			—		1,666
	Mortgage IRLCs		—			61			—		61
	Liabilities
	Fair value swap		$	—		$	—		$	135	$	135
	There were no transfers between Level 1 and Level 2 during 2014 or 2013. 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. The Fair Value Measurements tables exclude Park’s FHLB stock and FRB stock. These assets are carried at their respective redemption values, as it is not practicable to calculate their fair values. For securities where quoted prices or market prices of similar securities are not available, which include municipal securities, 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, 2014 and 2013, 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, 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	)
	Balance at January 1, 2013		$	780		$	(135	)
	Total Gains (Losses)
	Included in earnings - realized		(17		)	—
	Included in earnings - unrealized		—			—
	Included in other comprehensive income		(4		)	—
	Purchases, sales, issuances and settlements, other, net		—			—
	Re-evaluation of fair value swap		—			—
	Balance at December 31, 2013		$	759		$	(135	)
	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, 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
Fair Value Measurements at December 31, 2013 Using:
(In thousands)		Level 1			Level 2			Level 3		Balance at December 31, 2013
Impaired Loans:
Commercial real estate		$	—		$	—		$	21,100	$	21,100
Construction real estate:
SEPH commercial land and development		—			—			4,777		4,777
Remaining commercial		—			—			3,788		3,788
Residential real estate		—			—			4,154		4,154
Total impaired loans		$	—		$	—		$	33,819	$	33,819
Mortgage Servicing Rights		$	—		$	2,259		$	—	$	2,259
Other Real Estate Owned:
Commercial real estate		—			—			4,119		4,119
Construction real estate		—			—			11,041		11,041
Residential real estate		—			—			3,366		3,366
Total Other Real Estate Owned		$	—		$	—		$	18,526	$	18,526
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.
		31-Dec-14
(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
		31-Dec-13
(In thousands)		Recorded Investment			Prior Charge-Offs			Specific Valuation Allowance		Carrying Balance
Impaired loans recorded at fair value		$	41,002		$	48,952		$	7,183	$	33,819
Remaining impaired loans		71,313			14,320			3,268		68,045
Total impaired loans		$	112,315		$	63,272		$	10,451	$	101,864
The expense of credit adjustments related to impaired loans carried at fair value for the years ended December 31, 2014, 2013 and 2012 was $3.0 million, $8.1 million, and $16.0 million, respectively.
MSRs totaled $8.6 million at December 31, 2014. 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. The remaining $5.7 million was recorded at cost, as the fair value exceeded cost at December 31, 2014. At December 31, 2013, MSRs totaled $9.0 million. Of this $9.0 million MSR carrying balance, $2.3 million was recorded at fair value and included a valuation allowance of $1.0 million. The remaining $6.7 million was recorded at cost, as the fair value exceeded cost at December 31, 2013. Income (Expense) related to MSRs carried at fair value for the years ended December 31, 2014, 2013 and 2012 was $0.2 million, $1.3 million and $(1.3) million, respectively.
Total OREO held by Park at December 31, 2014 and 2013 was $22.6 million and $34.6 million, respectively. Approximately 46% and 53% of OREO held by Park at December 31, 2014 and 2013, respectively, was carried at fair value due to fair value adjustments made subsequent to the initial OREO measurement. At December 31, 2014 and 2013, OREO held at fair value, less estimated selling costs, amounted to $10.3 million and $18.5 million, respectively. The net expense related to OREO fair value adjustments was $2.4 million, $3.2 million and $6.9 million for the years ended December 31, 2014, 2013 and 2012, 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, 2014 and December 31, 2013:
31-Dec-14
(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%)
31-Dec-13
(In thousands)		Fair Value			Valuation Technique		Unobservable Input(s)	Range (Weighted Average)
Impaired loans:
Commercial real estate		$	21,100		Sales comparison approach		Adj to comparables	0.0% - 109.0% (22.8%)
					Income approach		Capitalization rate	8.0% - 12.5% (9.1%)
					Cost approach		Accumulated depreciation	11.7% - 65.0% (37.1%)
Construction real estate:
SEPH commercial land and development		$	4,777		Sales comparison approach		Adj to comparables	0.0% - 96.0% (13.9%)
					Bulk sale approach		Discount rate	11.0% - 20.0% (14.9%)
Remaining commercial		$	3,788		Sales comparison approach		Adj to comparables	0.0% - 40.0% (22.4%)
					Bulk sale approach		Discount rate	11.0% - 20.0% (18.0%)
Residential real estate		$	4,154		Sales comparison approach		Adj to comparables	0.0% - 121.8% (14.9%)
					Income approach		Capitalization rate	7.8% - 10.0% (8.4%)
Other real estate owned:
Commercial real estate		$	4,119		Sales comparison approach		Adj to comparables	0.0% - 140.0% (17.7%)
					Income approach		Capitalization rate	8.0% - 11.5% (9.6%)
					Cost approach		Accumulated depreciation	60.0% - 95.0% (80.0%)
Construction real estate		$	11,041		Sales comparison approach		Adj to comparables	0.0% - 484.0% (36.2%)
					Bulk sale approach		Discount rate	13.0% - 14.0% (13.6%)
Residential real estate		$	3,366		Sales comparison approach		Adj to comparables	0.0% - 273.0% (19.2%)
					Income approach		Capitalization rate	5.4% - 7.8% (7.4%)
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.
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, 2014 and December 31, 2013, was as follows:
		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
		31-Dec-13
					Fair Value Measurements
(In thousands)		Carrying value			Level 1			Level 2		Level 3		Total fair value
Financial assets:
Cash and money market instruments		$	147,030		$	147,030		$	—	$	—	$	147,030
Investment securities		1,358,327			1,900			1,361,009		759		1,363,668
Accrued interest receivable - securities		4,840			—			4,840		—		4,840
Accrued interest receivable - loans		13,495			—			—		13,495		13,495
Mortgage loans held for sale		1,666			—			1,666		—		1,666
Impaired loans carried at fair value		33,819			—			—		33,819		33,819
Mortgage IRLCs		61			—			61		—		61
Other loans		4,525,491			—			—		4,531,680		4,531,680
Loans receivable, net		$	4,561,037		$	—		$	1,727	$	4,565,499	$	4,567,226
Financial liabilities:
Non-interest bearing checking accounts		$	1,193,553		$	1,193,553		$	—	—		$	1,193,553
Interest bearing transaction accounts		1,145,525			1,145,525			—		—		1,145,525
Savings accounts		1,124,994			1,124,994			—		—		1,124,994
Time deposits		1,324,659			—			1,331,129		—		1,331,129
Other		1,263			1,263			—		—		1,263
Total deposits		$	4,789,994		$	3,465,335		$	1,331,129	$	—	$	4,796,464
Short-term borrowings		$	242,029		$	—		$	242,029	$	—	$	242,029
Long-term debt		810,541			—			860,963		—		860,963
Subordinated notes		80,250			—			83,140		—		83,140
Accrued interest payable – deposits		1,366			16			1,350		—		1,366
Accrued interest payable – debt/borrowings		1,535			4			1,531		—		1,535
Derivative financial instruments:
Fair value swap		$	135		$	—		$	—	$	135	$	135

Capital_Ratios

Capital Ratios	12 Months Ended
	Dec. 31, 2014
Capital [Abstract]
Capital Ratios	Capital Ratios
	At December 31, 2014 and 2013, the Corporation and PNB had Tier 1, total risk-based capital and leverage ratios which were well above the required minimum levels of 4.00%, 8.00% and 4.00%.
	The following table indicates the capital ratios for Park and PNB at December 31, 2014 and December 31, 2013.
		2014								2013
		Tier 1		Total Risk-Based			Leverage			Tier 1			Total Risk-Based			Leverage
		Risk-Based								Risk-Based
	Park National Bank	10.13	%	11.74	%		6.96	%		10.01	%		11.78	%		7.1	%
	Park	13.39	%	15.14	%		9.25	%		13.27	%		15.91	%		9.48	%
	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, 2014 and 2013, 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, 2014
	Total Risk-Based Capital
	(to risk-weighted assets)
	PNB	$	563,188		11.74	%		$	383,634			8	%		$	479,542		10	%
	Park	739,517			15.14	%		390,822				8	%		N/A			N/A
	Tier 1 Risk-Based Capital
	(to risk-weighted assets)
	PNB	$	485,943		10.13	%		$	191,817			4	%		$	287,725		6	%
	Park	654,339			13.39	%		195,411				4	%		N/A			N/A
	Leverage Ratio
	(to average total assets)
	PNB	$	485,943		6.96	%		$	279,210			4	%		$	349,013		5	%
	Park	654,339			9.25	%		282,992				4	%		N/A			N/A
	At December 31, 2013
	Total Risk-Based Capital
	(to risk-weighted assets)
	PNB	$	545,144		11.78	%		$	370,198			8	%		$	462,747		10	%
	Park	754,605			15.91	%		379,446				8	%		N/A			N/A
	Tier 1 Risk-Based Capital
	(to risk-weighted assets)
	PNB	$	463,015		10.01	%		$	185,099			4	%		$	277,648		6	%
	Park	629,410			13.27	%		189,723				4	%		N/A			N/A
	Leverage Ratio
	(to average total assets)
	PNB	$	463,015		7.1	%		$	261,025			4	%		$	326,281		5	%
	Park	629,410			9.48	%		265,633				4	%		N/A			N/A

Segment_Information

Segment Information	12 Months Ended
	Dec. 31, 2014
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, 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	171,365				4,103				11,766				8,000				195,234
	Income (loss) before taxes	113,143				1,809				7,577				(9,837		)		112,692
	Income taxes (benefit)	30,103				634				2,652				(4,787		)		28,602
	Net income (loss)	$	83,040			$	1,175			$	4,925			$	(5,050	)		$	84,090
	Balances at December 31, 2014
	Assets	$	6,912,443			$	40,308			$	43,762			$	6,743			$	7,003,256
	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	165,665				3,133				12,211				7,520				188,529
	Income (loss) before taxes	101,918				4,444				219				(4,223		)		102,358
	Income taxes (benefit)	26,324				1,556				77				(2,826		)		25,131
	Net income (loss)	$	75,594			$	2,888			$	142			$	(1,397	)		$	77,227
	Balances at December 31, 2013
	Assets	$	6,524,098			$	47,115			$	72,781			$	(5,647	)		$	6,638,347
	Loans	4,559,406				47,228				38,014				(24,143		)		4,620,505
	Deposits	4,896,405				7,159				—				(113,570		)		4,789,994
	Operating results for the year ended December 31, 2012 (In thousands)
		PNB				GFSC				SEPH				All Other				Total
	Net interest income (loss)	$	221,758			$	9,156			$	(341	)		$	4,742			$	235,315
	Provision for loan losses	16,678				859				17,882				—				35,419
	Other income	70,739				—				21,431				233				92,403
	Other expense	156,516				2,835				22,032				6,585				187,968
	Income (loss) before taxes	119,303				5,462				(18,824		)		(1,610		)		104,331
	Income taxes (benefit)	32,197				1,912				(6,603		)		(1,805		)		25,701
	Net income (loss)	$	87,106			$	3,550			$	(12,221	)		$	195			$	78,630
	Balances at December 31, 2012
	Assets	$	6,502,579			$	49,926			$	104,428			$	(14,130	)		$	6,642,803
	Loans	4,369,173				50,082				59,178				(28,111		)		4,450,322
	Deposits	4,814,107				8,358				—				(106,433		)		4,716,032
	The following is a reconciliation of financial information for the reportable segments to the Corporation’s consolidated totals:
		2014
	(In thousands)	Net Interest Income			Depreciation Expense				Other Expense				Income Taxes				Assets				Deposits
	Totals for reportable segments	$	227,056		$	7,243			$	179,991			$	33,389			$	6,996,513			$	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			$	187,991			$	28,602			$	7,003,256			$	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			$	173,694			$	27,957			$	6,643,994			$	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			$	181,214			$	25,131			$	6,638,347			$	4,789,994
		2012
	(In thousands)	Net Interest Income			Depreciation Expense				Other Expense				Income Taxes				Assets				Deposits
	Totals for reportable segments	$	230,573		$	6,954			$	174,429			$	27,506			$	6,656,933			$	4,822,465
	Elimination of intersegment items	8,558			—				—				—				(35,639		)		(106,433		)
	Parent Co. totals - not eliminated	(3,816		)	—				6,585				(1,805		)		21,509				—
	Totals	$	235,315		$	6,954			$	181,014			$	25,701			$	6,642,803			$	4,716,032

Parent_Company_Statements

Parent Company Statements	12 Months Ended
	Dec. 31, 2014
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 $5.81 million, $2.54 million and $4.54 million in 2014, 2013 and 2012, respectively.
	At December 31, 2014 and 2013, shareholders’ equity reflected in the Parent Company balance sheet includes $197.9 million and $196.0 million, respectively, of undistributed earnings of the Corporation’s subsidiaries which are restricted from transfer as dividends to the Corporation.
	Balance Sheets
	December 31, 2014 and 2013
	(In thousands)	2014			2013
	Assets:
	Cash	$	98,671		$	106,942
	Investment in subsidiaries	601,912			582,992
	Debentures receivable from PNB	25,000			25,000
	Other investments	2,344			2,297
	Other assets	23,260			21,984
	Total assets	$	751,187		$	739,215
	Liabilities:
	Subordinated notes	45,000			80,250
	Other liabilities	7,589			7,218
	Total liabilities	52,589			87,468
	Total shareholders’ equity	698,598			651,747
	Total liabilities and shareholders’ equity	$	751,187		$	739,215
	Statements of Income
	for the years ended December 31, 2014, 2013 and 2012
	(In thousands)	2014			2013			2012
	Income:
	Dividends from subsidiaries	$	60,000		$	15,000		$	197,000
	Interest and dividends	3,708			8,659			10,027
	Other	262			531			232
	Total income	63,970			24,190			207,259
	Expense:
	Other, net	13,807			13,413			11,869
	Total expense	13,807			13,413			11,869
	Income before federal taxes and equity in undistributed income (losses) of subsidiaries	50,163			10,777			195,390
	Federal income tax benefit	4,787			2,826			1,806
	Income before equity in undistributed income (losses) of subsidiaries	54,950			13,603			197,196
	Equity in undistributed income (losses) of subsidiaries	29,140			63,624			(118,566		)
	Net income	$	84,090		$	77,227		$	78,630
	Other comprehensive income (loss) (1)	21,811			(17,901		)	(8,687		)
	Comprehensive income	105,901			59,326			69,943
	(1) See Consolidated Statements of Comprehensive Income for other comprehensive income detail
	Statements of Cash Flows
	for the years ended December 31, 2014, 2013 and 2012
	(In thousands)	2014			2013			2012
	Operating activities:
	Net income	$	84,090		$	77,227		$	78,630
	Adjustments to reconcile net income to net cash provided by operating activities:
	Undistributed (income) losses of subsidiaries	(29,140		)	(63,624		)	118,566
	Compensation expense for issuance of treasury stock to directors	801			850			407
	Share-based compensation expense	458			—			—
	(Decrease) increase in other assets	(1,292		)	(2,215		)	5,748
	Increase (decrease) in other liabilities	298			(2,187		)	1,724
	Net cash provided by operating activities	55,215			10,051			205,075
	Investing activities:
	Capital contribution in subsidiary	—			(45,000		)	(45,000		)
	Purchase of debentures receivable from subsidiaries	—			—			(115,000		)
	Repayment of investments in and advances to subsidiaries	32,000			101,960			52,000
	Net cash provided by (used in) investing activities	32,000			56,960			(108,000		)
	Financing activities:
	Cash dividends paid	(57,876		)	(57,949		)	(60,154		)
	Payment to repurchase warrants	—			—			(2,843		)
	Payment to repurchase preferred shares	—			—			(100,000		)
	Repayment of subordinated notes	(35,250		)	—			—
	Repurchase of treasury shares	(2,355		)	(843		)	—
	Proceeds from issuance of subordinated notes	—			—			30,000
	Cash payment for fractional shares	(5		)	(3		)	(2		)
Net cash used in financing activities	(95,486		)	(58,795		)	(132,999		)
(Decrease) increase in cash	(8,271		)	8,216			(35,924		)
Cash at beginning of year	106,942			98,726			134,650
Cash at end of year	$	98,671		$	106,942		$	98,726

Participation_In_The_US_Treasu

Participation In The U.S. Treasury Capital Purchase Program	12 Months Ended
	Dec. 31, 2014
Participation In The U.S. Treasury Capital Purchase Program [Abstract]
Participation In U S Treasury Capital Purchase Program	Participation in the U.S. Treasury Capital Purchase Program (CPP)
	On December 23, 2008, Park issued $100 million of Fixed Rate Cumulative Perpetual Preferred Shares, Series A, with a liquidation preference of $1,000 per share (the “Series A Preferred Shares”), associated with Park's participation in the CPP. As part of its participation in the CPP, Park also issued a warrant to the U.S. Treasury to purchase 227,376 common shares (the “Warrant”).
	On April 25, 2012, Park entered into a Letter Agreement with the U.S. Treasury pursuant to which Park repurchased the 100,000 Series A Preferred Shares for a purchase price of $100 million plus a pro rata accrued and unpaid dividend. Total consideration of $101.0 million included accrued and unpaid dividends of $1.0 million. In addition to the accrued and unpaid dividends of $1.0 million, the charge to retained earnings, resulting from the repurchase of the Series A Preferred Shares, was $1.6 million on April 25, 2012.
	On May 2, 2012, Park entered into a Letter Agreement pursuant to which Park repurchased from the U.S. Treasury the Warrant to purchase 227,376 Park common shares in full for consideration of $2.8 million, or $12.50 per Park common share.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
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. Reclassifications had no effect on prior year net income or shareholders' equity.
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 $40.3 million at December 31, 2014 and $48.0 million at December 31, 2013. No other compensating balance arrangements were in existence at December 31, 2014.
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 6 of these Notes to Consolidated Financial Statements).
	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, 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.
	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. 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. Accrued interest on these loans is considered a loss, unless the loan is well-secured and in the process of collection. Commercial loans placed on nonaccrual status are considered impaired (see Note 7 of these Notes to Consolidated Financial Statements). 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 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 credit cards 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, 2014, 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 2014 within the individual segments of the commercial and consumer loan categories. Management believes the 72-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, 2014 was based on the historical loss experience over the past 72 months, plus an additional judgmental reserve, increasing the total allowance for loan loss coverage in the consumer portfolio to approximately 1.98 years of historical loss. The consumer loan portfolio loss coverage ratio was 1.68 years at December 31, 2013. The loss factor applied to Park’s commercial portfolio as of December 31, 2014 was based on the historical loss experience over the past 72 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 2.28 years of historical loss at December 31, 2014. The commercial loan portfolio loss coverage ratio was 2.42 years at December 31, 2013. 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, the observable market price of 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. 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 stated 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 (OREO)
	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 is 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 22 of these Notes to Consolidated Financial Statements.)
	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 and Other Intangible Assets
	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, 2014, the goodwill remaining on Park's Consolidated Balance Sheet consisted entirely of goodwill at PNB. (See Note 25 of these Notes to Consolidated Financial Statements 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, 2014, 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, changes in the funded status of the Company’s Defined Benefit Pension Plan, and the unrealized net holding gains and losses on the cash flow hedge that matured on December 28, 2012, 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. (See Note 15 of these Notes to Consolidated Financial Statements.)
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.
Derivative Instruments	Derivative Instruments
	At the inception of a derivative contract, the Company designates the derivative as one of three types based on the Company’s intentions and belief as to the derivative's likely effectiveness as a hedge. These three types are: (1) a hedge of the fair value of a recognized asset or liability or of an unrecognized firm commitment (“fair value hedge”); (2) a hedge of a forecasted transaction or the variability of cash flows to be received or paid related to a recognized asset or liability (“cash flow hedge”); or (3) an instrument with no hedging designation (“stand-alone derivative”). For a fair value hedge, the gain or loss on the derivative, as well as the offsetting loss or gain on the hedged item, are recognized in current earnings as fair values change. For a cash flow hedge, the gain or loss on the derivative is reported in other comprehensive income and is reclassified into earnings in the same periods during which the hedged transaction affects earnings. For both types of hedges, changes in the fair value of derivatives that are not highly effective in hedging the changes in fair value or expected cash flows of the hedged item are recognized immediately in current earnings. Changes in the fair value of derivatives that do not qualify for hedge accounting are reported currently in earnings, as non-interest income.
	The Company formally documents the relationship between derivatives and hedged items, as well as the risk-management objective and the strategy for undertaking hedge transactions at the inception of the hedging relationship. This documentation includes linking fair value or cash flow hedges to specific assets and liabilities on the Consolidated Balance Sheets or to specific firm commitments or forecasted transactions. The Company also formally assesses, both at the hedge’s inception and on an ongoing basis, whether the derivative instruments that are used are highly effective in offsetting changes in fair values or cash flows of the hedged items. The Company discontinues hedge accounting when it determines that the derivative is no longer effective in offsetting changes in the fair value or cash flows of the hedged item, the derivative is settled or terminates, a hedged forecasted transaction is no longer probable, a hedged firm commitment is no longer firm, or treatment of the derivative as a hedge is no longer appropriate or intended.
	When hedge accounting is discontinued, subsequent changes in fair value of the derivative are recorded as non-interest income. When a fair value hedge is discontinued, the hedged asset or liability is no longer adjusted for changes in fair value and the existing basis adjustment is amortized or accreted over the remaining life of the asset or liability. When a cash flow hedge is discontinued but the hedged cash flows or forecasted transactions are still expected to occur, gains or losses that were accumulated in other comprehensive income are amortized into earnings over the same periods in which the hedged transactions will affect earnings.
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 23 of these Notes to Consolidated Financial Statements. 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 401(k) plan expense is the amount of matching contributions. Deferred compensation and supplemental retirement plan expense allocates the benefits over years of service.
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.
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, The Park National Bank ("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 2013-11- Income Taxes (Topic 740): Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists: The ASU requires that an unrecognized tax benefit, or a portion of an unrecognized tax benefit, be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. However, if a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available at the reporting date under the tax law of the applicable jurisdiction to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and should not be combined with deferred tax assets. The amendments are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. The adoption of this guidance effective January 1, 2014 did not have an impact on Park's consolidated statements.
	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, FASB issued Accounting Standards Update 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 statement 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 is effective for annual periods, and interim reporting periods within those annual periods, beginning after December 15, 2014. The adoption of this guidance will not have a material impact on Park's consolidated financial statements, but may impact the presentation of Park's investments in qualified affordable housing projects. Finally, the adoption of this guidance will require additional disclosures.
	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 Accounting Standards Update 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). The 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 will not have a material impact on Park's consolidated financial statements, but will result in additional disclosures.
	ASU 2014-09 - Revenue from Contracts with Customers (Topic 606): In May 2014, FASB issued Accounting Standards Update 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, 2016. Early adoption is not permitted. 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, FASB issued Accounting Standards Update 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 will not have a material impact on Park's consolidated financial statements, but will result in additional disclosures.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
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

Sale_Of_Vision_Bank_Business_T

Sale Of Vision Bank Business (Tables)	12 Months Ended
	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
Schedule of composition of pre-tax gain on sale of business	The pre-tax gain, net of expense is summarized in the table below:
	(In thousands)
	Premium paid	$	27,913
	One-time gains	298
	Loss on sale of fixed assets	(2,434		)
	Employment and severance agreements	(1,610		)
	Other one-time charges, including estimates	(2,000		)
	Pre-tax gain	$	22,167

Goodwill_Tables

Goodwill (Tables)	12 Months Ended
	Dec. 31, 2014
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, 2014, 2013 and 2012.
	(In thousands)	Goodwill		Core Deposit Intangibles			Total
	1-Jan-12	$	72,334	$	2,509		$	74,843
	Amortization	—		(2,172		)	(2,172		)
	December 31, 2012	$	72,334	$	337		$	72,671
	Amortization	—		(337		)	(337		)
	December 31, 2013	$	72,334	$	—		$	72,334
	Amortization	—		—			—
	December 31, 2014	$	72,334	$	—		$	72,334

Investment_Securities_Tables

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Schedule of marketable securities	Investment securities at December 31, 2014 and December 31, 2013 were as follows:
	(In thousands)	Amortized Cost		Gross Unrealized/Unrecognized Holding Gains		Gross Unrealized/Unrecognized Holding Losses		Estimated Fair Value
	2014:00:00
	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
	2014:00:00
	Securities Held-to-Maturity
	U.S. Government sponsored entities’ asset-backed securities	$	140,562	$	3,088	$	160	$	143,490
	Total	$	140,562	$	3,088	$	160	$	143,490
	(In thousands)	Amortized Cost		Gross Unrealized/Unrecognized Holding Gains		Gross Unrealized/Unrecognized Holding Losses		Estimated Fair Value
	2013:00:00
	Securities Available-for-Sale
	Obligations of U.S. Treasury and other U.S. Government sponsored entities	$	570,632	$	—	$	45,496	$	525,136
	U.S. Government sponsored entities’ asset-backed securities	650,391		8,070		9,990		648,471
	Other equity securities	1,120		1,539		—		2,659
	Total	$	1,222,143	$	9,609	$	55,486	$	1,176,266
	2013:00:00
	Securities Held-to-Maturity
	Obligations of states and political subdivisions	$	240	$	1	$	—	$	241
	U.S. Government sponsored entities’ asset-backed securities	181,821		5,382		42		187,161
	Total	$	182,061	$	5,383	$	42	$	187,402
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, 2014 and December 31, 2013:
		Less than 12 Months				12 Months or Longer				Total
	(In thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
	2014:00:00
	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
	2014:00:00
	Securities Held-to-Maturity
	U.S. Government sponsored entities’ asset-backed securities	$	8,032	$	148	$	2,714	$	12	$	10,746	$	160
		Less than 12 Months				12 Months or Longer				Total
	(In thousands)	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
	2013:00:00
	Securities Available-for-Sale
	Obligations of U.S. Treasury and other U.S. Government sponsored entities	$	377,626	$	29,256	$	147,510	$	16,240	$	525,136	45,496
	U.S. Government sponsored entities' asset-backed securities	404,035		8,917		21,572		1,073		425,607		9,990
	Total	$	781,661	$	38,173	$	169,082	$	17,313	$	950,743	$	55,486
	2013:00:00
	Securities Held-to-Maturity
	U.S. Government sponsored entities' asset-backed securities	$	5,781	$	42	$	—	$	—	$	5,781	$	42
Schedule of contractual maturity of debt securities	The amortized cost and estimated fair value of investments in debt securities at December 31, 2014, are shown in the following table by contractual maturity or the expected call date, 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		Weighted Average Yield
	Securities Available-for-Sale
	U.S. Treasury and other U.S. Government sponsored entities’ notes:
	Due one through five years	30,000		30,011		2.1	%
	Due five through ten years	516,886		508,053		2.35	%
	Total	$	546,886	$	538,064	2.34	%
	U.S. Government sponsored entities’ asset-backed securities	$	751,974	$	761,153	2.36	%
	Securities Held-to-Maturity
	U.S. Government sponsored entities’ asset-backed securities	$	140,562	$	143,490	3.58	%

Loans_Tables

Loans (Tables)	12 Months Ended
	Dec. 31, 2014
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, 2014 and December 31, 2013 was as follows:
		12/31/14										12/31/13
	(In thousands)	Loan Balance			Accrued Interest Receivable			Recorded Investment				Loan Balance			Accrued Interest Receivable		Recorded Investment
	Commercial, financial and agricultural *	$	856,535		$	3,218		$	859,753			$	825,432		$	3,079	$	828,511
	Commercial real estate *	1,069,637			3,546			1,073,183				1,112,273			3,765		1,116,038
	Construction real estate:
	SEPH commercial land and development *	2,195			—			2,195				5,846			2		5,848
	Remaining commercial	115,139			300			115,439				110,842			263		111,105
	Mortgage	31,148			72			31,220				31,882			96		31,978
	Installment	7,322			23			7,345				7,546			26		7,572
	Residential real estate:
	Commercial	417,612			1,038			418,650				407,387			904		408,291
	Mortgage	1,189,709			1,548			1,191,257				1,144,754			1,559		1,146,313
	HELOC	216,915			803			217,718				213,565			870		214,435
	Installment	27,139			97			27,236				33,841			132		33,973
	Consumer	893,160			2,967			896,127				723,733			2,775		726,508
	Leases	3,171			17			3,188				3,404			23		3,427
	Total loans	$	4,829,682		$	13,629		$	4,843,311			$	4,620,505		$	13,494	$	4,633,999
	* Included within commercial, financial and agricultural loans, commercial real estate loans, and SEPH commercial land and development loans were 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, and loans past due 90 days or more and still accruing by class of loan as of December 31, 2014 and December 31, 2013:
		12/31/14
	(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
		12/31/13
	(In thousands)	Nonaccrual Loans			Accruing Troubled Debt Restructurings			Loans Past Due 90 Days or More and Accruing			Total Nonperforming Loans
	Commercial, financial and agricultural	$	20,633		$	107		$	80		$	20,820
	Commercial real estate	39,588			2,234			2			41,824
	Construction real estate:
	SEPH commercial land and development	4,777			—			—			4,777
	Remaining commercial	10,476			306			—			10,782
	Mortgage	87			97			—			184
	Installment	39			192			—			231
	Residential real estate:
	Commercial	32,495			913			—			33,408
	Mortgage	20,564			11,708			549			32,821
	HELOC	2,129			751			—			2,880
	Installment	965			885			80			1,930
	Consumer	3,463			1,616			1,016			6,095
	Total loans	$	135,216		$	18,809		$	1,727		$	155,752
Schedule of loans individually evaluated for impairment and loans collectively evaluated for impairment	The following table provides additional information regarding those nonaccrual and accruing troubled debt restructured loans that are individually evaluated for impairment and those collectively evaluated for impairment as of December 31, 2014 and December 31, 2013.
		12/31/14										12/31/13
		Nonaccrual and accruing troubled debt restructurings			Loans individually evaluated for impairment			Loans collectively evaluated for impairment				Nonaccrual and accruing troubled debt restructurings			Loans individually evaluated for impairment		Loans collectively evaluated for impairment
	(In thousands)
	Commercial, financial and agricultural	$	19,123		$	19,106		$	17			$	20,740		$	20,727	$	13
	Commercial real estate	21,989			21,989			—				41,822			41,822		—
	Construction real estate:
	SEPH commercial land and development	2,078			2,078			—				4,777			4,777		—
	Remaining commercial	5,609			5,609			—				10,782			10,782		—
	Mortgage	153			—			153				184			—		184
	Installment	240			—			240				231			—		231
	Residential real estate:
	Commercial	24,930			24,930			—				33,408			33,408		—
	Mortgage	32,218			—			32,218				32,272			—		32,272
	HELOC	2,509			—			2,509				2,880			—		2,880
	Installment	2,522			—			2,522				1,850			—		1,850
	Consumer	5,354			—			5,354				5,079			799		4,280
	Total loans	$	116,725		$	73,712		$	43,013			$	154,025		$	112,315	$	41,710
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, 2014 and December 31, 2013.
		12/31/14										12/31/13
	(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	$	30,601		$	17,883		$	—			$	22,429		$	12,885	$	—
	Commercial real estate	27,923			20,696			—				56,870			34,149		—
	Construction real estate:
	SEPH commercial land and development	11,026			2,078			—				23,722			4,777		—
	Remaining commercial	1,427			391			—				8,429			6,872		—
	Residential real estate:
	Commercial	25,822			23,352			—				36,709			31,461		—
	Consumer	—			—			—				799			799		—
	With an allowance recorded
	Commercial, financial and agricultural	1,251			1,223			981				12,616			7,842		3,268
	Commercial real estate	1,310			1,293			262				7,966			7,673		5,496
	Construction real estate:
	Remaining commercial	5,218			5,218			1,812				3,909			3,910		1,132
	Residential real estate:
	Commercial	1,578			1,578			605				2,129			1,947		555
	Consumer	—			—			—				—			—		—
	Total	$	106,156		$	73,712		$	3,660			$	175,578		$	112,315	$	10,451
Schedule of average recorded investment and interest income recognized on loans individually evaluated for impairment	the years ended December 31, 2014, 2013, and 2012:
					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
					Year ended
					31-Dec-12
	(In thousands)	Recorded Investment as of December 31, 2012			Average recorded investment			Interest income recognized
	Commercial, financial and agricultural	$	22,587		$	35,305		$	529
	Commercial real estate	44,278			44,541			968
	Construction real estate:
	SEPH commercial land and development	13,260			17,277			—
	Remaining commercial	21,574			27,774			818
	Residential real estate:
	Commercial	35,622			39,248			497
	Consumer	18			19			1
	Total	$	137,339		$	164,164		$	2,813
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, 2014 and December 31, 2013 by class of loan.
		12/31/14
	(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.
		12/31/13
	(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	$	1,233		$	13,275		$	14,508		$	814,003		$	828,511
	Commercial real estate	2,168			18,274			20,442			1,095,596			1,116,038
	Construction real estate:
	SEPH commercial land and development	—			4,242			4,242			1,606			5,848
	Remaining commercial	—			3,463			3,463			107,642			111,105
	Mortgage	264			75			339			31,639			31,978
	Installment	207			14			221			7,351			7,572
	Residential real estate:
	Commercial	900			5,659			6,559			401,732			408,291
	Mortgage	13,633			11,829			25,462			1,120,851			1,146,313
	HELOC	571			402			973			213,462			214,435
	Installment	696			436			1,132			32,841			33,973
	Consumer	12,143			3,941			16,084			710,424			726,508
	Leases	—			—			—			3,427			3,427
	Total loans	$	31,815		$	61,610		$	93,425		$	4,540,574		$	4,633,999
Schedule of recorded investment by loan grade	The tables below present the recorded investment by loan grade at December 31, 2014 and December 31, 2013 for all commercial loans:
		12/31/14
	(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, commercial real estate loans, and SEPH commercial land and development loans was an immaterial amount of consumer loans that were not broken out by class.
		12/31/13
	(In thousands)	5 Rated			6 Rated			Impaired			Pass Rated			Recorded Investment
	Commercial, financial and agricultural*	$	6,055		$	532		$	20,740		$	801,184		$	828,511
	Commercial real estate*	11,591			1,525			41,822			1,061,100			1,116,038
	Construction real estate:
	SEPH commercial land and development*	354			—			4,777			717			5,848
	Remaining commercial	6,858			244			10,782			93,221			111,105
	Residential real estate:
	Commercial	5,033			397			33,408			369,453			408,291
	Leases	—			—			—			3,427			3,427
	Total Commercial Loans	$	29,891		$	2,698		$	111,529		$	2,329,102		$	2,473,220
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, 2014 and 2013 as well as the recorded investment of these contracts at December 31, 2014 and 2013. The recorded investment pre- and post-modification is generally the same due to the fact that Park does not typically provide for forgiveness of principal.
		Year ended
		31-Dec-14
	(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
		31-Dec-13
	(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, 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					Year ended
		31-Dec-14					31-Dec-13
	(In thousands)	Number of Contracts		Recorded Investment			Number of Contracts			Recorded Investment
	Commercial, financial and agricultural	4		$	206		11			$	771
	Commercial real estate	1		302			11			2,839
	Construction real estate:
	SEPH commercial land and development	—		—			—			—
	Remaining commercial	—		—			—			—
	Mortgage	—		—			—			—
	Installment	—		—			1			10
	Residential real estate:
	Commercial	1		3			4			1,683
	Mortgage	14		810			26			1,533
	HELOC	2		160			—			—
	Installment	2		12			5			72
	Consumer	62		516			74			471
	Leases	—		—			—			—
	Total loans	86		$	2,009		$	132		$	7,379

Allowance_for_Loan_Losses_Tabl

Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2014
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, 2014, 2013, and 2012 is summarized in the following tables.
		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
		Year ended December 31, 2012
	(In thousands)	Commercial, financial and agricultural			Commercial real estate			Construction real estate			Residential real estate			Consumer			Leases			Total
	Allowance for credit losses:
	Beginning balance	$	16,950		$	15,539		$	14,433		$	15,692		$	5,830		$	—		$	68,444
	Charge-offs	26,847			10,454			9,985			8,607			5,375			—			61,268
	Recoveries	(1,066		)	(783		)	(2,979		)	(5,559		)	(2,555		)	—			(12,942		)
	Net charge-offs	25,781			9,671			7,006			3,048			2,820			—			48,326
	Provision (Recovery)	24,466			5,868			(586		)	2,115			3,556			—			35,419
	Ending balance	$	15,635		$	11,736		$	6,841		$	14,759		$	6,566		—			$	55,537
Schedule of the composition of the allowance for loan losses	The composition of the allowance for loan losses at December 31, 2014 and 2013 was as follows:
		31-Dec-14
	(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		%	0.8		%	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
		31-Dec-13
	(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	$	3,268		$	5,496		$	1,132		$	555		$	—		$	—		$	10,451
	Collectively evaluated for impairment	10,950			10,403			5,723			13,696			8,245			—			49,017
	Total ending allowance balance	$	14,218		$	15,899		$	6,855		$	14,251		$	8,245		$	—		$	59,468
	Loan Balance:
	Loans individually evaluated for impairment	$	20,724		$	41,816		$	15,559		$	33,406		$	799		$	—		$	112,304
	Loans collectively evaluated for impairment	804,708			1,070,457			140,557			1,766,141			722,934			3,404			4,508,201
	Total ending loan balance	$	825,432		$	1,112,273		$	156,116		$	1,799,547		$	723,733		$	3,404		$	4,620,505
	Allowance for loan losses as a percentage of loan balance:
	Loans individually evaluated for impairment	15.77		%	13.14		%	7.28		%	1.66		%	—		%	—		%	9.31		%
	Loans collectively evaluated for impairment	1.36		%	0.97		%	4.07		%	0.78		%	1.14		%	—		%	1.09		%
	Total	1.72		%	1.43		%	4.39		%	0.79		%	1.14		%	—		%	1.29		%
	Recorded Investment:
	Loans individually evaluated for impairment	$	20,727		$	41,822		$	15,559		$	33,408		$	799		$	—		$	112,315
	Loans collectively evaluated for impairment	807,784			1,074,216			140,944			1,769,604			725,709			3,427			4,521,684
	Total recorded investment	$	828,511		$	1,116,038		$	156,503		$	1,803,012		$	726,508		$	3,427		$	4,633,999

Premises_And_Equipment_Tables

Premises And Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
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)	2014			2013
	Land	$	17,836		$	17,657
	Buildings	71,002			70,183
	Equipment, furniture and fixtures	42,139			36,937
	Leasehold improvements	3,439			3,903
	Total	$	134,416		$	128,680
	Less accumulated depreciation	(78,937		)	(73,402		)
	Premises and equipment, net	$	55,479		$	55,278
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)
	2015	1,143
	2016	755
	2017	559
	2018	448
	2019	367
	Thereafter	252
	Total	$	3,524

Deposits_Tables

Deposits (Tables)	12 Months Ended
	Dec. 31, 2014
Deposits [Abstract]
Maturities Of Time Deposits Greater Than 100 K [Table Text Block]	Maturities of time deposits over $100,000 and $250,000 as of December 31, 2014 were:
	December 31 (In thousands)	Over $100,000		Over $250,000
	3 months or less	$	210,386	$	18,927
	Over 3 months through 6 months	93,168		11,954
	Over 6 months through 12 months	132,344		10,470
	Over 12 months	323,295		223,892
	Total	$	759,193	$	265,243
Schedule of summary of non-interest bearing and interest bearing deposits	At December 31, 2014 and 2013, non-interest bearing and interest bearing deposits were as follows:
	December 31 (In thousands)	2014			2013
	Non-interest bearing	$	1,269,296		$	1,193,553
	Interest bearing	3,858,704			3,596,441
	Total	$	5,128,000		$	4,789,994
Schedule of maturities of time deposits	At December 31, 2014, the maturities of time deposits were as follows:
	(In thousands)
	2015	$	823,230
	2016	254,565
	2017	145,321
	2018	42,160
	2019	144,133
	After 5 years	502
	Total	$	1,409,911

ShortTerm_Borrowings_Tables

Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2014
Short-term Debt [Abstract]
Schedule of short-term debt	Short-term borrowings were as follows:
	December 31 (In thousands)	2014			2013
	Securities sold under agreements to repurchase and federal funds purchased	$	276,980		$	242,029
	FHLB advances	—			—
	Total short-term borrowings	$	276,980		$	242,029
	The outstanding balances for all short-term borrowings as of December 31, 2014 and 2013 and the weighted-average interest rates as of and paid during each of the years then ended were as follows:
	(In thousands)	Repurchase agreements and Federal Funds Purchased			FHLB Advances
	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		%	0.1		%
	2013
	Ending balance	$	242,029		$	—
	Highest month-end balance	280,863			—
	Average daily balance	251,868			1,255
	Weighted-average interest rate:
	As of year-end	0.19		%	—		%
	Paid during the year	0.21		%	0.41		%

LongTerm_Debt_Tables

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Schedule of maturities of long-term debt	Long-term debt is listed below:
	December 31,	2014					2013
	(In thousands)	Outstanding Balance			Average Rate		Outstanding Balance			Average Rate
	Total Federal Home Loan Bank advances by year of maturity:
	2014	—			—	%	100,500			1.51	%
	2015	51,000			2	%	51,000			2	%
	2016	26,000			0.92	%	26,000			0.92	%
	2017	51,000			1.28	%	51,000			3.37	%
	2018	125,049			2.11	%	125,062			2.11	%
	2019	75,333			1.97	%	25,415			1.94	%
	Thereafter	176,161			3.16	%	151,330			3.33	%
	Total	$	504,543		2.3	%	530,307			2.39	%
	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:
	2014	—			—	%	100,500			1.51	%
	2015	51,000			2	%	51,000			2	%
	2016	26,000			0.92	%	26,000			0.92	%
	2017	351,000			1.68	%	351,000			1.99	%
	2018	125,049			2.11	%	125,062			2.11	%
	2019	75,333			1.97	%	25,415			1.94	%
	Thereafter	176,161			3.16	%	151,330			3.33	%
	Total	$	804,543		2.09	%	$	830,307		2.16	%
	Prepayment penalty	(17,941		)	—		(19,766		)	—
	Total long-term debt	$	786,602		2.89	%	$	810,541		2.79	%

Benefit_Plans_Tables

Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2014
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, 2014 and 2013, plan assets and benefit obligation activity for the Pension Plan are listed below:
	(In thousands)		2014				2013
	Change in fair value of plan assets
	Fair value at beginning of measurement period		$	152,739			$	117,768
	Actual return on plan assets		15,511				31,518
	Company contributions		—				12,638
	Benefits paid		(7,652		)		(9,185		)
	Fair value at end of measurement period		$	160,598			$	152,739
	Change in benefit obligation
	Projected benefit obligation at beginning of measurement period		$	89,179			$	97,653
	Service cost		4,331				4,817
	Interest cost		4,577				4,223
	Actuarial (gains) loss		18,893				(8,329		)
	Benefits paid		(7,652		)		(9,185		)
	Projected benefit obligation at the end of measurement period		$	109,328			$	89,179
	Funded status at end of year (fair value of plan assets less benefit obligation)		$	51,270			$	63,560
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		2014			2013
	Equity securities		50% - 100%		85	%		83	%
	Fixed income and cash equivalents		remaining balance		15	%		17	%
	Total				100	%		100	%
Schedule of assumptions used to determine benefit obligations	The weighted average assumptions used to determine benefit obligations at December 31, 2014, 2013 and 2012 were as follows:
			2014			2013			2012
	Discount rate		4.42	%		5.3	%		4.47	%
	Rate of compensation increase								3	%
	Under age 30		10	%		10	%
	Ages 30-39		6	%		6	%
	Ages 40 and over		3	%		3	%
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):
	2015	$	6,282
	2016	6,236
	2017	6,902
	2018	7,081
	2019	7,799
	2020-2024	46,850
	Total	$	81,150
Schedule of balances of accumulated other comprehensive income loss	The following table shows ending balances of accumulated other comprehensive loss at December 31, 2014 and 2013.
	(In thousands)		2014				2013
	Prior service cost		$	(15	)		$	(34	)
	Net actuarial loss		(22,855		)		(8,579		)
	Total		(22,870		)		(8,613		)
	Deferred taxes		8,005				3,015
	Accumulated other comprehensive loss		$	(14,865	)		$	(5,598	)
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 2014, 2013 and 2012, components of net periodic benefit cost and other amounts recognized in other comprehensive (loss) income were as follows:
	(In thousands)		2014				2013				2012
	Components of net periodic benefit cost and other amounts recognized in other comprehensive (loss) income
	Service cost		$	(4,331	)		$	(4,817	)		$	(4,271	)
	Interest cost		(4,577		)		(4,223		)		(4,048		)
	Expected return on plan assets		10,869				9,536				8,742
	Amortization of prior service cost		(19		)		(20		)		(20		)
	Recognized net actuarial loss		—				(2,703		)		(1,708		)
	Net periodic benefit income (cost)		$	1,942			$	(2,227	)		$	(1,305	)
	Change to net actuarial (loss) gain for the period		$	(14,276	)		$	30,409			$	(11,236	)
	Amortization of prior service cost		19				20				20
	Amortization of net loss		—				2,703				1,708
	Total recognized in other comprehensive (loss) income		(14,257		)		33,132				(9,508		)
	Total recognized in net benefit cost and other comprehensive (loss) income		$	(12,315	)		$	30,905			$	(10,813	)
Schedule of assumptions used to determine costs	The weighted average assumptions used to determine net periodic benefit cost for the years ended December 31, 2014, 2013 and 2012 are listed below:
			2014			2013			2012
	Discount Rate		5.3	%		4.47	%		5.18	%
	Rate of compensation increase								3	%
	Under age 30		10	%		10	%
	Ages 30-39		6	%		6	%
	Ages 40 and over		3	%		3	%
	Expected long-term return on plan assets		7.25	%		7.5	%		7.75	%

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
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)	2014				2013
	Deferred tax assets:
	Allowance for loan losses	$	19,023			$	20,814
	Accumulated other comprehensive loss – Pension Plan	8,005				3,015
	Accumulated other comprehensive loss – Unrealized losses on securities	—				16,057
	Intangible assets	543				673
	Deferred compensation	3,820				3,611
	OREO devaluations	3,984				5,287
	Partnership adjustments	4,725				3,793
	Net deferred loan fees	933				282
	Other	3,795				3,423
	Total deferred tax assets	$	44,828			$	56,955
	Deferred tax liabilities:
	Accumulated other comprehensive income – Unrealized gains on securities	677				—
	Deferred investment income	10,199				10,199
	Pension Plan	25,949				25,261
	Mortgage servicing rights	3,015				3,154
	Other	804				850
	Total deferred tax liabilities	$	40,644			$	39,464
	Net deferred tax assets	$	4,184			$	17,491
Federal and state income taxes	The components of the provision for federal income taxes are shown below:
	December 31, (In thousands)	2014				2013				2012
	Currently payable
	Federal	$	27,039			$	27,587			$	12,984
	Deferred
	Federal	1,563				(2,456		)		12,717
	Total	28,602				25,131				25,701
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, 2014, 2013 and 2012.
		2014			2013			2012
	Statutory federal corporate tax rate	35	%		35	%		35	%
	Changes in rates resulting from:
	Tax exempt interest income, net of disallowed interest	(0.5	)%		(0.8	)%		(0.9	)%
	Bank owned life insurance	(1.5	)%		(1.7	)%		(1.6	)%
	Tax credits (low income housing)	(6.3	)%		(6.6	)%		(6.1	)%
	Other	(1.3	)%		(1.3	)%		(1.8	)%
	Effective tax rate	25.4	%		24.6	%		24.6	%
Reconciliation of unrecognized tax benefits	The following is a reconciliation of the beginning and ending amount of unrecognized tax benefits.
	(In thousands)	2014				2013				2012
	January 1 Balance	$	518			$	517			$	485
	Additions based on tax positions related to the current year	76				74				74
	Additions for tax positions of prior years	14				4				25
	Reductions for tax positions of prior years	—				—				—
	Reductions due to statute of limitations	(76		)		(77		)		(67		)
	December 31 Balance	$	532			$	518			$	517

Other_Comprehensive_Income_Los1

Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2014
Other Comprehensive Income (Loss) [Abstract]
Schedule of components of other comprehensive income (loss)	The following table provides information concerning amounts reclassified out of accumulated other comprehensive income (loss) for the years ended December 31, 2014 and 2013:
			Amount Reclassified from Accumulated Other Comprehensive Income (Loss)				Affected Line Item in the Consolidated Statement of Income
	(in thousands)		2014		2013
	Amortization of defined benefit pension items
		Amortization of prior service cost	$	19	$	20	Salaries and employee benefits
		Amortization of net loss	—		2,703		Salaries and employee benefits
	Total income before income taxes		19		2,723		Total income before income taxes
		Federal income taxes	7		953		Federal income taxes
		Net of tax	$	12	$	1,770	Net of tax
	Unrealized gains & losses on available for sale securities
		Loss on sale of investment securities	$	1,158	$	—	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, 2014
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	2014		2013		2012
	(In thousands, except share data)
	Numerator:
	Net income available to common shareholders	$	84,090	$	77,227	$	75,205
	Denominator:
	Basic earnings per common share:
	Weighted-average shares	15,394,971		15,412,365		15,407,078
	Effect of dilutive securities – restricted stock units and warrants	18,861		—		1,063
	Diluted earnings per common share:
	Adjusted weighted-average shares and assumed conversions	15,413,832		15,412,365		15,408,141
	Earnings per common share:
	Basic earnings per common share	$	5.46	$	5.01	$	4.88
	Diluted earnings per common share	$	5.46	$	5.01	$	4.88

Financial_Instruments_With_Off1

Financial Instruments With Off-Balance Sheet Risk And Financial Instruments With Concentrations Of Credit Risk (Tables)	12 Months Ended
	Dec. 31, 2014
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)	2014		2013
	Loan commitments	$	885,052	$	821,795
	Standby letters of credit	12,473		20,590

Loan_Servicing_Tables

Loan Servicing (Tables)	12 Months Ended
	Dec. 31, 2014
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)	2014			2013			2012
	Mortgage servicing rights:
	Carrying amount, net, beginning of year	$	9,013		$	7,763		$	9,301
	Additions	1,026			2,436			3,399
	Amortization	(1,631		)	(2,479		)	(3,634		)
	Change in valuation allowance	205			1,293			(1,303		)
	Carrying amount, net, end of year	$	8,613		$	9,013		$	7,763
	Valuation allowance:
	Beginning of year	$	1,031		$	2,324		$	1,021
	Change in valuation allowance	(205		)	(1,293		)	1,303
	End of year	$	826		$	1,031		$	2,324

Fair_Values_Tables

Fair Values (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
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, 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
	Fair Value Measurements at December 31, 2013 using:
	(In thousands)	Level 1			Level 2			Level 3		Balance at December 31, 2013
	Assets
	Investment securities:
	Obligations of U.S. Treasury and other U.S. Government sponsored entities	$	—		$	525,136		$	—	$	525,136
	U.S. Government sponsored entities’ asset-backed securities	—			648,471			—		648,471
	Equity securities	1,900			—			759		2,659
	Mortgage loans held for sale	—			1,666			—		1,666
	Mortgage IRLCs	—			61			—		61
	Liabilities
	Fair value swap	$	—		$	—		$	135	$	135
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, 2014 and 2013, 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, 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	)
	Balance at January 1, 2013	$	780		$	(135	)
	Total Gains (Losses)
	Included in earnings - realized	(17		)	—
	Included in earnings - unrealized	—			—
	Included in other comprehensive income	(4		)	—
	Purchases, sales, issuances and settlements, other, net	—			—
	Re-evaluation of fair value swap	—			—
	Balance at December 31, 2013	$	759		$	(135	)
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, 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
	Fair Value Measurements at December 31, 2013 Using:
	(In thousands)	Level 1			Level 2			Level 3		Balance at December 31, 2013
	Impaired Loans:
	Commercial real estate	$	—		$	—		$	21,100	$	21,100
	Construction real estate:
	SEPH commercial land and development	—			—			4,777		4,777
	Remaining commercial	—			—			3,788		3,788
	Residential real estate	—			—			4,154		4,154
	Total impaired loans	$	—		$	—		$	33,819	$	33,819
	Mortgage Servicing Rights	$	—		$	2,259		$	—	$	2,259
	Other Real Estate Owned:
	Commercial real estate	—			—			4,119		4,119
	Construction real estate	—			—			11,041		11,041
	Residential real estate	—			—			3,366		3,366
	Total Other Real Estate Owned	$	—		$	—		$	18,526	$	18,526
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, 2014 and December 31, 2013:
	31-Dec-14
	(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%)
	31-Dec-13
	(In thousands)	Fair Value			Valuation Technique		Unobservable Input(s)	Range (Weighted Average)
	Impaired loans:
	Commercial real estate	$	21,100		Sales comparison approach		Adj to comparables	0.0% - 109.0% (22.8%)
					Income approach		Capitalization rate	8.0% - 12.5% (9.1%)
					Cost approach		Accumulated depreciation	11.7% - 65.0% (37.1%)
	Construction real estate:
	SEPH commercial land and development	$	4,777		Sales comparison approach		Adj to comparables	0.0% - 96.0% (13.9%)
					Bulk sale approach		Discount rate	11.0% - 20.0% (14.9%)
	Remaining commercial	$	3,788		Sales comparison approach		Adj to comparables	0.0% - 40.0% (22.4%)
					Bulk sale approach		Discount rate	11.0% - 20.0% (18.0%)
	Residential real estate	$	4,154		Sales comparison approach		Adj to comparables	0.0% - 121.8% (14.9%)
					Income approach		Capitalization rate	7.8% - 10.0% (8.4%)
	Other real estate owned:
	Commercial real estate	$	4,119		Sales comparison approach		Adj to comparables	0.0% - 140.0% (17.7%)
					Income approach		Capitalization rate	8.0% - 11.5% (9.6%)
					Cost approach		Accumulated depreciation	60.0% - 95.0% (80.0%)
	Construction real estate	$	11,041		Sales comparison approach		Adj to comparables	0.0% - 484.0% (36.2%)
					Bulk sale approach		Discount rate	13.0% - 14.0% (13.6%)
	Residential real estate	$	3,366		Sales comparison approach		Adj to comparables	0.0% - 273.0% (19.2%)
					Income approach		Capitalization rate	5.4% - 7.8% (7.4%)
Fair value, by balance sheet grouping	The fair value of financial instruments at December 31, 2014 and December 31, 2013, was as follows:
		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
		31-Dec-13
					Fair Value Measurements
	(In thousands)	Carrying value			Level 1			Level 2		Level 3		Total fair value
	Financial assets:
	Cash and money market instruments	$	147,030		$	147,030		$	—	$	—	$	147,030
	Investment securities	1,358,327			1,900			1,361,009		759		1,363,668
	Accrued interest receivable - securities	4,840			—			4,840		—		4,840
	Accrued interest receivable - loans	13,495			—			—		13,495		13,495
	Mortgage loans held for sale	1,666			—			1,666		—		1,666
	Impaired loans carried at fair value	33,819			—			—		33,819		33,819
	Mortgage IRLCs	61			—			61		—		61
	Other loans	4,525,491			—			—		4,531,680		4,531,680
	Loans receivable, net	$	4,561,037		$	—		$	1,727	$	4,565,499	$	4,567,226
	Financial liabilities:
	Non-interest bearing checking accounts	$	1,193,553		$	1,193,553		$	—	—		$	1,193,553
	Interest bearing transaction accounts	1,145,525			1,145,525			—		—		1,145,525
	Savings accounts	1,124,994			1,124,994			—		—		1,124,994
	Time deposits	1,324,659			—			1,331,129		—		1,331,129
	Other	1,263			1,263			—		—		1,263
	Total deposits	$	4,789,994		$	3,465,335		$	1,331,129	$	—	$	4,796,464
	Short-term borrowings	$	242,029		$	—		$	242,029	$	—	$	242,029
	Long-term debt	810,541			—			860,963		—		860,963
	Subordinated notes	80,250			—			83,140		—		83,140
	Accrued interest payable – deposits	1,366			16			1,350		—		1,366
	Accrued interest payable – debt/borrowings	1,535			4			1,531		—		1,535
	Derivative financial instruments:
	Fair value swap	$	135		$	—		$	—	$	135	$	135
Impaired Financing Receivables [Table Text Block]
		31-Dec-14
	(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
		31-Dec-13
	(In thousands)	Recorded Investment			Prior Charge-Offs			Specific Valuation Allowance		Carrying Balance
	Impaired loans recorded at fair value	$	41,002		$	48,952		$	7,183	$	33,819
	Remaining impaired loans	71,313			14,320			3,268		68,045
	Total impaired loans	$	112,315		$	63,272		$	10,451	$	101,864

Capital_Ratios_Tables

Capital Ratios (Tables)	12 Months Ended
	Dec. 31, 2014
Capital [Abstract]
Schedule of compliance with regulatory capital requirements under banking regulations	The following table indicates the capital ratios for Park and PNB at December 31, 2014 and December 31, 2013.
		2014								2013
		Tier 1		Total Risk-Based			Leverage			Tier 1			Total Risk-Based			Leverage
		Risk-Based								Risk-Based
	Park National Bank	10.13	%	11.74	%		6.96	%		10.01	%		11.78	%		7.1	%
	Park	13.39	%	15.14	%		9.25	%		13.27	%		15.91	%		9.48	%
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, 2014
	Total Risk-Based Capital
	(to risk-weighted assets)
	PNB	$	563,188		11.74	%		$	383,634			8	%		$	479,542		10	%
	Park	739,517			15.14	%		390,822				8	%		N/A			N/A
	Tier 1 Risk-Based Capital
	(to risk-weighted assets)
	PNB	$	485,943		10.13	%		$	191,817			4	%		$	287,725		6	%
	Park	654,339			13.39	%		195,411				4	%		N/A			N/A
	Leverage Ratio
	(to average total assets)
	PNB	$	485,943		6.96	%		$	279,210			4	%		$	349,013		5	%
	Park	654,339			9.25	%		282,992				4	%		N/A			N/A
	At December 31, 2013
	Total Risk-Based Capital
	(to risk-weighted assets)
	PNB	$	545,144		11.78	%		$	370,198			8	%		$	462,747		10	%
	Park	754,605			15.91	%		379,446				8	%		N/A			N/A
	Tier 1 Risk-Based Capital
	(to risk-weighted assets)
	PNB	$	463,015		10.01	%		$	185,099			4	%		$	277,648		6	%
	Park	629,410			13.27	%		189,723				4	%		N/A			N/A
	Leverage Ratio
	(to average total assets)
	PNB	$	463,015		7.1	%		$	261,025			4	%		$	326,281		5	%
	Park	629,410			9.48	%		265,633				4	%		N/A			N/A

Segment_Information_Tables

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2014
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, 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	171,365				4,103				11,766				8,000				195,234
	Income (loss) before taxes	113,143				1,809				7,577				(9,837		)		112,692
	Income taxes (benefit)	30,103				634				2,652				(4,787		)		28,602
	Net income (loss)	$	83,040			$	1,175			$	4,925			$	(5,050	)		$	84,090
	Balances at December 31, 2014
	Assets	$	6,912,443			$	40,308			$	43,762			$	6,743			$	7,003,256
	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	165,665				3,133				12,211				7,520				188,529
	Income (loss) before taxes	101,918				4,444				219				(4,223		)		102,358
	Income taxes (benefit)	26,324				1,556				77				(2,826		)		25,131
	Net income (loss)	$	75,594			$	2,888			$	142			$	(1,397	)		$	77,227
	Balances at December 31, 2013
	Assets	$	6,524,098			$	47,115			$	72,781			$	(5,647	)		$	6,638,347
	Loans	4,559,406				47,228				38,014				(24,143		)		4,620,505
	Deposits	4,896,405				7,159				—				(113,570		)		4,789,994
	Operating results for the year ended December 31, 2012 (In thousands)
		PNB				GFSC				SEPH				All Other				Total
	Net interest income (loss)	$	221,758			$	9,156			$	(341	)		$	4,742			$	235,315
	Provision for loan losses	16,678				859				17,882				—				35,419
	Other income	70,739				—				21,431				233				92,403
	Other expense	156,516				2,835				22,032				6,585				187,968
	Income (loss) before taxes	119,303				5,462				(18,824		)		(1,610		)		104,331
	Income taxes (benefit)	32,197				1,912				(6,603		)		(1,805		)		25,701
	Net income (loss)	$	87,106			$	3,550			$	(12,221	)		$	195			$	78,630
	Balances at December 31, 2012
	Assets	$	6,502,579			$	49,926			$	104,428			$	(14,130	)		$	6,642,803
	Loans	4,369,173				50,082				59,178				(28,111		)		4,450,322
	Deposits	4,814,107				8,358				—				(106,433		)		4,716,032
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:
		2014
	(In thousands)	Net Interest Income			Depreciation Expense				Other Expense				Income Taxes				Assets				Deposits
	Totals for reportable segments	$	227,056		$	7,243			$	179,991			$	33,389			$	6,996,513			$	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			$	187,991			$	28,602			$	7,003,256			$	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			$	173,694			$	27,957			$	6,643,994			$	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			$	181,214			$	25,131			$	6,638,347			$	4,789,994
		2012
	(In thousands)	Net Interest Income			Depreciation Expense				Other Expense				Income Taxes				Assets				Deposits
	Totals for reportable segments	$	230,573		$	6,954			$	174,429			$	27,506			$	6,656,933			$	4,822,465
	Elimination of intersegment items	8,558			—				—				—				(35,639		)		(106,433		)
	Parent Co. totals - not eliminated	(3,816		)	—				6,585				(1,805		)		21,509				—
	Totals	$	235,315		$	6,954			$	181,014			$	25,701			$	6,642,803			$	4,716,032

Parent_Company_Statements_Tabl

Parent Company Statements (Tables)	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Balance Sheets
	Balance Sheets
	December 31, 2014 and 2013
	(In thousands)	2014			2013
	Assets:
	Cash	$	98,671		$	106,942
	Investment in subsidiaries	601,912			582,992
	Debentures receivable from PNB	25,000			25,000
	Other investments	2,344			2,297
	Other assets	23,260			21,984
	Total assets	$	751,187		$	739,215
	Liabilities:
	Subordinated notes	45,000			80,250
	Other liabilities	7,589			7,218
	Total liabilities	52,589			87,468
	Total shareholders’ equity	698,598			651,747
	Total liabilities and shareholders’ equity	$	751,187		$	739,215
Statements of Income
	Statements of Income
	for the years ended December 31, 2014, 2013 and 2012
	(In thousands)	2014			2013			2012
	Income:
	Dividends from subsidiaries	$	60,000		$	15,000		$	197,000
	Interest and dividends	3,708			8,659			10,027
	Other	262			531			232
	Total income	63,970			24,190			207,259
	Expense:
	Other, net	13,807			13,413			11,869
	Total expense	13,807			13,413			11,869
	Income before federal taxes and equity in undistributed income (losses) of subsidiaries	50,163			10,777			195,390
	Federal income tax benefit	4,787			2,826			1,806
	Income before equity in undistributed income (losses) of subsidiaries	54,950			13,603			197,196
	Equity in undistributed income (losses) of subsidiaries	29,140			63,624			(118,566		)
	Net income	$	84,090		$	77,227		$	78,630
	Other comprehensive income (loss) (1)	21,811			(17,901		)	(8,687		)
	Comprehensive income	105,901			59,326			69,943
Statements of Cash Flows
	Statements of Cash Flows
	for the years ended December 31, 2014, 2013 and 2012
	(In thousands)	2014			2013			2012
	Operating activities:
	Net income	$	84,090		$	77,227		$	78,630
	Adjustments to reconcile net income to net cash provided by operating activities:
	Undistributed (income) losses of subsidiaries	(29,140		)	(63,624		)	118,566
	Compensation expense for issuance of treasury stock to directors	801			850			407
	Share-based compensation expense	458			—			—
	(Decrease) increase in other assets	(1,292		)	(2,215		)	5,748
	Increase (decrease) in other liabilities	298			(2,187		)	1,724
	Net cash provided by operating activities	55,215			10,051			205,075
	Investing activities:
	Capital contribution in subsidiary	—			(45,000		)	(45,000		)
	Purchase of debentures receivable from subsidiaries	—			—			(115,000		)
	Repayment of investments in and advances to subsidiaries	32,000			101,960			52,000
	Net cash provided by (used in) investing activities	32,000			56,960			(108,000		)
	Financing activities:
	Cash dividends paid	(57,876		)	(57,949		)	(60,154		)
	Payment to repurchase warrants	—			—			(2,843		)
	Payment to repurchase preferred shares	—			—			(100,000		)
	Repayment of subordinated notes	(35,250		)	—			—
	Repurchase of treasury shares	(2,355		)	(843		)	—
	Proceeds from issuance of subordinated notes	—			—			30,000
	Cash payment for fractional shares	(5		)	(3		)	(2		)
	Net cash used in financing activities	(95,486		)	(58,795		)	(132,999		)
	(Decrease) increase in cash	(8,271		)	8,216			(35,924		)
	Cash at beginning of year	106,942			98,726			134,650
	Cash at end of year	$	98,671		$	106,942		$	98,726

Summary_of_Significant_Account3

Summary of Significant Accounting Policies - Narrative (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Line Items]
Average required reserve balance	$40.30	$48
Historical loss period used in estimating loan loss reserve	72 months
Reserve coverage period in historical losses	1 year 11 months 22 days	1 year 8 months 5 days
Compensating Balance, Amount	$0
Commercial Loan
Accounting Policies [Line Items]
Reserve coverage period in historical losses	2 years 3 months 12 days	2 years 5 months

Summary_of_Significant_Account4

Summary of Significant Accounting Policies - Depreciable Lives of Premises and Equipment (Details)	12 Months Ended
	Dec. 31, 2014
Minimum | Buildings
Property, Plant and Equipment [Line Items]
Premises and equipment, depreciable lives	5 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	50 years
Maximum | Equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Premises and equipment, depreciable lives	20 years
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, depreciable lives	10 years

Sale_Of_Vision_Bank_Business_N

Sale Of Vision Bank Business - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 16, 2012	Feb. 19, 2012
Purchase price				$27,900,000
Gain on sale of the Vision business	0	0	22,167,000
Vision Bank | Obligation to repurchase receivables sold
Maximum amount allowed to put back				7,500,000
Put expiration period	180 days
Number of loans included in payments	44
Purchase price of loans	7,500,000
Amount of loans put back during the period	4,200,000
Amount of other expenses recognized due to provision for put backs	3,300,000
Non Performing Retained By Sellc [Member]
Loans left with Vision subsequent to transactions					88,000,000
Performing Retained By Sellc [Member]
Loans left with Vision subsequent to transactions					$22,000,000

Sale_Of_Vision_Bank_Business_S

Sale Of Vision Bank Business - Schedule of Composition of Pre-tax Gain on Sale of Business (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Discontinued Operations and Disposal Groups [Abstract]
Premium paid			$27,913
One-time gains			298
Loss on sale of fixed assets			-2,434
Employment and severance agreements			-1,610
Other one-time charges, including estimates			-2,000
Pre-tax gain	$0	$0	$22,167

Sale_Of_Vision_Bank_Business_S1

Sale Of Vision Bank Business - Schedule of Balance Sheet of SEPH (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Loans	$4,829,682	$4,620,505	$4,450,322
OREO	22,605	34,636
Other assets	489,439	506,046
Total assets	7,003,256	6,638,347	6,642,803
Other liabilities	68,076	63,786
Total liabilities and shareholders’ equity	$7,003,256	$6,638,347

Goodwill_Details

Goodwill (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Goodwill	$72,334,000	$72,334,000	$72,334,000	$72,334,000
Amortization of intangibles	0	337,000	2,172,000
Goodwill And Finite Lived Intangible Assets	72,334,000	72,334,000	72,671,000	74,843,000
Core deposits
Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets Amortization	0	337,000	2,172,000
Other Intangible Assets, Net	$0	$0	$337,000	$2,509,000

Investment_Securities_Narrativ

Investment Securities - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Investments [Line Items]
Other than Temporary Impairment Losses, Investments	$0	$17,000	$54,000
Amortized cost of securities available-for-sale	1,299,980,000	1,222,143,000
Amortized cost of held-to-maturity securities	140,562,000	182,061,000
Federal home loan bank stock	50,100,000	59,000,000
Federal reserve bank stock	8,200,000	6,900,000
Federal Home Loan Bank (FHLB) advance borrowings	1,205,000,000	1,321,000,000
Money pledged for government and trust department deposits	513,000,000	639,000,000
Money pledged to secure repurchase agreements	664,000,000	648,000,000
Money pledged as collateral for FHLB advance borrowings	28,000,000	34,000,000
Percentage of amount greater than shareholder's equity	10.00%
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
FHLB Shares repurchased	89,460
FHLB Stock amount repurchased	8,900,000
FRB Stock shares purchased	27,000
FRB amount stock purchased	1,400,000
U.S. Treasury and sponsored entities callable notes
Schedule of Investments [Line Items]
Available-for-sale securities	546,900,000
Available for Sale expected to be called	30,000,000
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	187000
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	751,974,000	650,391,000
Amortized cost of held-to-maturity securities	140,562,000	181,821,000
Residential mortgage-backed securities
Schedule of Investments [Line Items]
Amortized cost of securities available-for-sale	387,100,000
Amortized cost of held-to-maturity securities	0
Collateralized mortgage-backed securities
Schedule of Investments [Line Items]
Amortized cost of securities available-for-sale	364,900,000
Amortized cost of held-to-maturity securities	140,600,000
U.S. Government sponsored entity mortgage-backed securities
Schedule of Investments [Line Items]
Proceeds from sale of investment securities			$0
Minimum | U.S. Treasury and sponsored entities callable notes
Schedule of Investments [Line Items]
Available for Sale Securities, Debt Maturities, Term.	5
Maximum | U.S. Treasury and sponsored entities callable notes
Schedule of Investments [Line Items]
Available for Sale Securities, Debt Maturities, Term.	8

Investment_Securities_Schedule

Investment Securities - Schedule of Investment Securities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Securities Available-for-Sale
Amortized Cost	$1,299,980	$1,222,143
Gross Unrealized/Unrecognized Holding Gains	15,010	9,609
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	13,075	55,486
Estimated Fair Value	1,301,915	1,176,266
Securities Held-to-Maturity
Amortized cost of held-to-maturity securities	140,562	182,061
Gross Unrealized/Unrecognized Holding Gains	3,088	5,383
Gross Unrealized/Unrecognized Holding Losses	160	42
Estimated Fair Value	143,490	187,402
Obligations of U.S. Treasury and other U.S. Government sponsored entities
Securities Available-for-Sale
Amortized Cost	546,886	570,632
Gross Unrealized/Unrecognized Holding Gains	11
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	8,833	45,496
Estimated Fair Value	538,064	525,136
Obligations of States and Political Subdivisions
Securities Held-to-Maturity
Amortized cost of held-to-maturity securities		240
Gross Unrealized/Unrecognized Holding Gains		1
Estimated Fair Value		241
U.S. Government sponsored entity asset-backed securities
Securities Available-for-Sale
Amortized Cost	751,974	650,391
Gross Unrealized/Unrecognized Holding Gains	13,421	8,070
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	4,242	9,990
Estimated Fair Value	761,153	648,471
Securities Held-to-Maturity
Amortized cost of held-to-maturity securities	140,562	181,821
Gross Unrealized/Unrecognized Holding Gains	3,088	5,382
Gross Unrealized/Unrecognized Holding Losses	160	42
Estimated Fair Value	143,490	187,161
Equity securities
Securities Available-for-Sale
Amortized Cost	1,120	1,120
Gross Unrealized/Unrecognized Holding Gains	1,578	1,539
Estimated Fair Value	$2,698	$2,659

Investment_Securities_Schedule1

Investment Securities - Schedule of Unrealized Loss on Securities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 Months	$193,189	$781,661
12 Months or Longer	558,570	169,082
Total	751,759	950,743
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months	223	38,173
12 Months or Longer	12,852	17,313
Total	13,075	55,486
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	119,913	377,626
12 Months or Longer	388,140	147,510
Total	508,053	525,136
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months	87	29,256
12 Months or Longer	8,746	16,240
Total	8,833	45,496
U.S. Government sponsored entity asset-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 Months	73,276	404,035
12 Months or Longer	170,430	21,572
Total	243,706	425,607
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months	136	8,917
12 Months or Longer	4,106	1,073
Total	4,242	9,990
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 Months	8,032	5,781
12 Months or Longer	2,714
Total	10,746	5,781
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months	148	42
12 Months or Longer	12
Total	$160	$42

Investment_Securities_Amortize

Investment Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Estimated Fair Value	$1,301,915	$1,176,266
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]
U.S. Government sponsored entities’ asset-backed securities	140,562	182,061
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]
U.S. Government sponsored entities’ asset-backed securities	143,490	187,402
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	30,000
Due five through ten years	516,886
Total	546,886
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Due one through five years	30,011
Due five through ten years	508,053
Estimated Fair Value	538,064	525,136
Available for Sale Securities Weighted Avg Yield	2.34%
Available for Sale Securities Debt Maturities After Five Through Ten Years Weighted Avg Yield	2.35%
Available for Sale Securities Debt Maturities After One Through Five Years Weighted Avg Yield	2.10%
Obligations of States and Political Subdivisions
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]
U.S. Government sponsored entities’ asset-backed securities		240
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]
U.S. Government sponsored entities’ asset-backed securities		241
U.S. Government sponsored entity asset-backed securities
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract]
Total	751,974
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Estimated Fair Value	761,153	648,471
Available for Sale Securities Weighted Avg Yield	2.36%
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]
U.S. Government sponsored entities’ asset-backed securities	140,562	181,821
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]
U.S. Government sponsored entities’ asset-backed securities	$143,490	$187,161
Held to Maturity Securities weighted avg yield	3.58%

Loans_Narrative_Details

Loans - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Deferred Income	$9,400,000	$7,300,000
Deposit Liabilities Reclassified as Loans Receivable	2,300,000	3,300,000
Troubled Debt Restructuring, Classification removed	2,500,000	7,700,000
Partial charge-offs on impaired loans	32,480,000	63,272,000
Allowance for loans individually evaluated for impairment	3,660,000	10,451,000
Recorded investment, related to loans	9,300,000	21,400,000
Loans 90 days past due and still accruing	2,709,000	1,727,000
TDRs included in nonaccrual loan totals	47,500,000	76,300,000
Nonaccrual TDRs considered current	15,700,000	50,600,000
TDRs included in accruing loan totals	16,300,000	18,800,000
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR	1,400,000	4,000,000
Specific reserves related to troubled debt restructuring	2,400,000	7,500,000
Additional specific reserves related to troubled debt restructuring	700,000	1,100,000
Modified substandard commercial loans, total recorded investment	987,000	878,000
Modified substandard consumer loans total recorded investment	19,900,000	24,200,000
Nonaccrual loans not classified as TDRs at prior fiscal year end	700,000	5,500,000
Recorded investment modified as TDRs	2,009,000	7,379,000
Other real estate owned	22,600,000	34,600,000
With no related allowance recorded
Financing Receivable, Recorded Investment [Line Items]
Partial charge-offs on impaired loans	32,400,000	58,100,000
With an allowance recorded
Financing Receivable, Recorded Investment [Line Items]
Partial charge-offs on impaired loans	0	5,200,000
Consumer
Financing Receivable, Recorded Investment [Line Items]
Allowance for loans individually evaluated for impairment	0	0
Loans 90 days past due and still accruing	1,133,000	1,016,000
Executive officers and directors
Financing Receivable, Recorded Investment [Line Items]
Loans due from related party	45,700,000	49,700,000
New loan made to related party	6,000,000	500,000
Repayment of loans due from related party	14,100,000	10,000,000
Increase (Decrease) in Customer Advances	6,400,000	11,900,000
Accruing
Financing Receivable, Recorded Investment [Line Items]
Recorded investment modified as TDRs	314,000	397,000
Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Recorded investment modified as TDRs	1,700,000	7,000,000
Loans receivable | Executive officers and directors
Financing Receivable, Recorded Investment [Line Items]
Loans due from related party	$36,000,000	$37,700,000

Loans_Composition_of_Loan_Port

Loans - Composition of Loan Portfolio By Class of Loan (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]
Loan Balance	$4,829,682		$4,620,505
Accrued Interest Receivable	13,629		13,494
Recorded Investment	4,843,311		4,633,999
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Loan Balance	856,535	[1]	825,432	[1]
Accrued Interest Receivable	3,218	[1]	3,079	[1]
Recorded Investment	859,753	[1]	828,511	[1]
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loan Balance	1,069,637	[1]	1,112,273	[1]
Accrued Interest Receivable	3,546	[1]	3,765	[1]
Recorded Investment	1,073,183	[1]	1,116,038	[1]
Construction real estate
Financing Receivable, Recorded Investment [Line Items]
Loan Balance	155,804		156,116
Recorded Investment	156,199		156,503
SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Loan Balance	2,195	[1]	5,846	[1]
Accrued Interest Receivable	0	[1]	2	[1]
Recorded Investment	2,195	[1]	5,848	[1]
Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Loan Balance	115,139		110,842
Accrued Interest Receivable	300		263
Recorded Investment	115,439		111,105
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Loan Balance	31,148		31,882
Accrued Interest Receivable	72		96
Recorded Investment	31,220		31,978
Installment
Financing Receivable, Recorded Investment [Line Items]
Loan Balance	7,322		7,546
Accrued Interest Receivable	23		26
Recorded Investment	7,345		7,572
Commercial
Financing Receivable, Recorded Investment [Line Items]
Loan Balance	417,612		407,387
Accrued Interest Receivable	1,038		904
Recorded Investment	418,650		408,291
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Loan Balance	1,189,709		1,144,754
Accrued Interest Receivable	1,548		1,559
Recorded Investment	1,191,257		1,146,313
HELOC
Financing Receivable, Recorded Investment [Line Items]
Loan Balance	216,915		213,565
Accrued Interest Receivable	803		870
Recorded Investment	217,718		214,435
Installment
Financing Receivable, Recorded Investment [Line Items]
Loan Balance	27,139		33,841
Accrued Interest Receivable	97		132
Recorded Investment	27,236		33,973
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loan Balance	893,160		723,733
Accrued Interest Receivable	2,967		2,775
Recorded Investment	896,127		726,508
Leases
Financing Receivable, Recorded Investment [Line Items]
Loan Balance	3,171		3,404
Accrued Interest Receivable	17		23
Recorded Investment	$3,188		$3,427
[1]	Included within commercial, financial and agricultural loans, commercial real estate loans, and SEPH commercial land and development loans were an immaterial amount of consumer loans that were not broken out by class.

Loans_Recorded_Investment_in_N

Loans - Recorded Investment in Nonaccrual, Restructured and Loans Past Due 90 Days or More and Accruing (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	$73,712	$112,315	$137,339
Nonaccrual Loans	100,393	135,216
Accruing Troubled Debt Restructurings	16,332	18,809
Loans Past Due 90 Days or More and Accruing	2,709	1,727
Total Nonperforming Loans	119,434	155,752
Impaired Financing Receivable, Average Recorded Investment	92,614	124,089	164,164
Impaired Financing Receivable, Interest Income, Cash Basis Method	2,678	2,640	2,813
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	19,106	20,727	22,587
Nonaccrual Loans	18,826	20,633
Accruing Troubled Debt Restructurings	297	107
Loans Past Due 90 Days or More and Accruing	229	80
Total Nonperforming Loans	19,352	20,820
Impaired Financing Receivable, Average Recorded Investment	19,518	20,523	35,305
Impaired Financing Receivable, Interest Income, Cash Basis Method	360	412	529
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	21,989	41,822	44,278
Nonaccrual Loans	19,299	39,588
Accruing Troubled Debt Restructurings	2,690	2,234
Loans Past Due 90 Days or More and Accruing	0	2
Total Nonperforming Loans	21,989	41,824
Impaired Financing Receivable, Average Recorded Investment	31,945	41,426	44,541
Impaired Financing Receivable, Interest Income, Cash Basis Method	1,027	1,151	968
SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	2,078	4,777	13,260
Nonaccrual Loans	2,078
Accruing Troubled Debt Restructurings	0
Loans Past Due 90 Days or More and Accruing	0
Total Nonperforming Loans	2,078
Impaired Financing Receivable, Average Recorded Investment	3,658	8,723	17,277
Impaired Financing Receivable, Interest Income, Cash Basis Method	146
SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans		4,777
Accruing Troubled Debt Restructurings		0
Loans Past Due 90 Days or More and Accruing		0
Total Nonperforming Loans		4,777
Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	5,609	10,782	21,574
Nonaccrual Loans	5,558	10,476
Accruing Troubled Debt Restructurings	51	306
Loans Past Due 90 Days or More and Accruing	0	0
Total Nonperforming Loans	5,609	10,782
Impaired Financing Receivable, Average Recorded Investment	8,784	17,829	27,774
Impaired Financing Receivable, Interest Income, Cash Basis Method	61	616	818
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	59	87
Accruing Troubled Debt Restructurings	94	97
Loans Past Due 90 Days or More and Accruing	9	0
Total Nonperforming Loans	162	184
Installment
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	115	39
Accruing Troubled Debt Restructurings	125	192
Loans Past Due 90 Days or More and Accruing	0	0
Total Nonperforming Loans	240	231
Commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	24,930	33,408	35,622
Nonaccrual Loans	24,336	32,495
Accruing Troubled Debt Restructurings	594	913
Loans Past Due 90 Days or More and Accruing	0	0
Total Nonperforming Loans	24,930	33,408
Impaired Financing Receivable, Average Recorded Investment	28,306	34,972	39,248
Impaired Financing Receivable, Interest Income, Cash Basis Method	1,084	461	497
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	21,869	20,564
Accruing Troubled Debt Restructurings	10,349	11,708
Loans Past Due 90 Days or More and Accruing	1,329	549
Total Nonperforming Loans	33,547	32,821
HELOC
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	1,879	2,129
Accruing Troubled Debt Restructurings	630	751
Loans Past Due 90 Days or More and Accruing	9	0
Total Nonperforming Loans	2,518	2,880
Installment
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	1,743	965
Accruing Troubled Debt Restructurings	779	885
Loans Past Due 90 Days or More and Accruing	0	80
Total Nonperforming Loans	2,522	1,930
Consumer
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		799	18
Nonaccrual Loans	4,631	3,463
Accruing Troubled Debt Restructurings	723	1,616
Loans Past Due 90 Days or More and Accruing	1,133	1,016
Total Nonperforming Loans	6,487	6,095
Impaired Financing Receivable, Average Recorded Investment	403	616	19
Impaired Financing Receivable, Interest Income, Cash Basis Method			$1

Loans_Loans_Individually_and_C

Loans - Loans Individually and Collectively Evaluated for Impairment (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing troubled debt restructurings	$116,725	$154,025
Loans individually evaluated for impairment	73,712	112,315
Loans collectively evaluated for impairment	43,013	41,710
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing troubled debt restructurings	19,123	20,740
Loans individually evaluated for impairment	19,106	20,727
Loans collectively evaluated for impairment	17	13
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing troubled debt restructurings	21,989	41,822
Loans individually evaluated for impairment	21,989	41,822
Loans collectively evaluated for impairment	0	0
SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing troubled debt restructurings	2,078	4,777
Loans individually evaluated for impairment	2,078	4,777
Loans collectively evaluated for impairment	0	0
Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing troubled debt restructurings	5,609	10,782
Loans individually evaluated for impairment	5,609	10,782
Loans collectively evaluated for impairment	0	0
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing troubled debt restructurings	153	184
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	153	184
Installment
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing troubled debt restructurings	240	231
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	240	231
Commercial
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing troubled debt restructurings	24,930	33,408
Loans individually evaluated for impairment	24,930	33,408
Loans collectively evaluated for impairment	0	0
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing troubled debt restructurings	32,218	32,272
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	32,218	32,272
HELOC
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing troubled debt restructurings	2,509	2,880
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	2,509	2,880
Installment
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing troubled debt restructurings	2,522	1,850
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	2,522	1,850
Consumer
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing troubled debt restructurings	5,354	5,079
Loans individually evaluated for impairment	0	799
Loans collectively evaluated for impairment	$5,354	$4,280

Loans_Loans_Individually_Evalu

Loans - Loans Individually Evaluated for Impairment by Class of Loans (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	$106,156	$175,578
Recorded investment	73,712	112,315	137,339
Allowance for loan losses allocated	3,660	10,451
Impaired Financing Receivable, Average Recorded Investment	92,614	124,089	164,164
Impaired Financing Receivable, Interest Income, Cash Basis Method	2,678	2,640	2,813
Commercial, financial and agricultural
Financing Receivable, Impaired [Line Items]
Recorded investment	19,106	20,727	22,587
Impaired Financing Receivable, Average Recorded Investment	19,518	20,523	35,305
Impaired Financing Receivable, Interest Income, Cash Basis Method	360	412	529
Commercial, financial and agricultural | With no related allowance recorded
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	30,601	22,429
Recorded investment	17,883	12,885
Commercial, financial and agricultural | With an allowance recorded
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	1,251	12,616
Recorded investment	1,223	7,842
Allowance for loan losses allocated	981	3,268
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded investment	21,989	41,822	44,278
Impaired Financing Receivable, Average Recorded Investment	31,945	41,426	44,541
Impaired Financing Receivable, Interest Income, Cash Basis Method	1,027	1,151	968
Commercial real estate | With no related allowance recorded
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	27,923	56,870
Recorded investment	20,696	34,149
Commercial real estate | With an allowance recorded
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	1,310	7,966
Recorded investment	1,293	7,673
Allowance for loan losses allocated	262	5,496
SEPH commercial land and development | With no related allowance recorded
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	11,026	23,722
Recorded investment	2,078	4,777
Remaining commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	5,609	10,782	21,574
Impaired Financing Receivable, Average Recorded Investment	8,784	17,829	27,774
Impaired Financing Receivable, Interest Income, Cash Basis Method	61	616	818
Remaining commercial | With no related allowance recorded
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	1,427	8,429
Recorded investment	391	6,872
Remaining commercial | With an allowance recorded
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	5,218	3,909
Recorded investment	5,218	3,910
Allowance for loan losses allocated	1,812	1,132
Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	24,930	33,408	35,622
Impaired Financing Receivable, Average Recorded Investment	28,306	34,972	39,248
Impaired Financing Receivable, Interest Income, Cash Basis Method	1,084	461	497
Commercial | With no related allowance recorded
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	25,822	36,709
Recorded investment	23,352	31,461
Commercial | With an allowance recorded
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	1,578	2,129
Recorded investment	1,578	1,947
Allowance for loan losses allocated	605	555
Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment		799	18
Impaired Financing Receivable, Average Recorded Investment	403	616	19
Impaired Financing Receivable, Interest Income, Cash Basis Method			1
Consumer | With no related allowance recorded
Financing Receivable, Impaired [Line Items]
Unpaid principal balance		799
Recorded investment		799
Construction Real Estate Vision Commercial Land And Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	2,078	4,777	13,260
Impaired Financing Receivable, Average Recorded Investment	3,658	8,723	17,277
Impaired Financing Receivable, Interest Income, Cash Basis Method	$146

Loans_Average_Recorded_Investm

Loans - Average Recorded Investment and Interest Income Recognized on Loans Individually Evaluated for Impairment (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Recorded investment	$73,712	$112,315	$137,339
Average recorded investment	92,614	124,089	164,164
Interest income recognized	2,678	2,640	2,813
Commercial, financial and agricultural
Financing Receivable, Impaired [Line Items]
Recorded investment	19,106	20,727	22,587
Average recorded investment	19,518	20,523	35,305
Interest income recognized	360	412	529
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded investment	21,989	41,822	44,278
Average recorded investment	31,945	41,426	44,541
Interest income recognized	1,027	1,151	968
SEPH commercial land and development
Financing Receivable, Impaired [Line Items]
Recorded investment	2,078	4,777	13,260
Average recorded investment	3,658	8,723	17,277
Interest income recognized	146
Remaining commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	5,609	10,782	21,574
Average recorded investment	8,784	17,829	27,774
Interest income recognized	61	616	818
Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	24,930	33,408	35,622
Average recorded investment	28,306	34,972	39,248
Interest income recognized	1,084	461	497
Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment		799	18
Average recorded investment	403	616	19
Interest income recognized			$1

Loans_Aging_of_Recorded_Invest

Loans - Aging of Recorded Investment in Past Due Loans(Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	$31,074		$31,815
Past due nonaccrual loans and loans past due 90 days or more and accruing	52,932	[1]	61,610	[2]
Total past due	84,006		93,425
Total current	4,759,305		4,540,574
Recorded Investment	4,843,311		4,633,999
Commercial, financial and agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	6,482		1,233
Past due nonaccrual loans and loans past due 90 days or more and accruing	7,508	[1]	13,275	[2]
Total past due	13,990		14,508
Total current	845,763		814,003
Recorded Investment	859,753	[3]	828,511	[3]
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	808		2,168
Past due nonaccrual loans and loans past due 90 days or more and accruing	8,288	[1]	18,274	[2]
Total past due	9,096		20,442
Total current	1,064,087		1,095,596
Recorded Investment	1,073,183	[3]	1,116,038	[3]
Construction real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment	156,199		156,503
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	2,068	[1]
Total past due	2,068
Total current	127
Recorded Investment	2,195
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			4,242	[2]
Total past due			4,242
Total current			1,606
Recorded Investment			5,848
Remaining commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	166
Past due nonaccrual loans and loans past due 90 days or more and accruing	77	[1]	3,463	[2]
Total past due	243		3,463
Total current	115,196		107,642
Recorded Investment	115,439		111,105
Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	39		264
Past due nonaccrual loans and loans past due 90 days or more and accruing	68	[1]	75	[2]
Total past due	107		339
Total current	31,113		31,639
Recorded Investment	31,220		31,978
Installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	21		207
Past due nonaccrual loans and loans past due 90 days or more and accruing	25	[1]	14	[2]
Total past due	46		221
Total current	7,299		7,351
Recorded Investment	7,345		7,572
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	250		900
Past due nonaccrual loans and loans past due 90 days or more and accruing	19,592	[1]	5,659	[2]
Total past due	19,842		6,559
Total current	398,808		401,732
Recorded Investment	418,650		408,291
Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	11,146		13,633
Past due nonaccrual loans and loans past due 90 days or more and accruing	10,637	[1]	11,829	[2]
Total past due	21,783		25,462
Total current	1,169,474		1,120,851
Recorded Investment	1,191,257		1,146,313
HELOC
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	262		571
Past due nonaccrual loans and loans past due 90 days or more and accruing	387	[1]	402	[2]
Total past due	649		973
Total current	217,069		213,462
Recorded Investment	217,718		214,435
Installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	596		696
Past due nonaccrual loans and loans past due 90 days or more and accruing	464	[1]	436	[2]
Total past due	1,060		1,132
Total current	26,176		32,841
Recorded Investment	27,236		33,973
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days	11,304		12,143
Past due nonaccrual loans and loans past due 90 days or more and accruing	3,818	[1]	3,941	[2]
Total past due	15,122		16,084
Total current	881,005		710,424
Recorded Investment	896,127		726,508
Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total current	3,188		3,427
Recorded Investment	$3,188		$3,427
[1]	Includes $2.7 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans.
[2]	Includes $1.7 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, commercial real estate loans, and SEPH commercial land and development loans were an immaterial amount of consumer loans that were not broken out by class.

Loans_Recorded_Investment_by_L

Loans - Recorded Investment by Loan Grade (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Five Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	$16,252	$29,891
Five Rated [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	1,874	6,055
Five Rated [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	8,448	11,591
Five Rated [Member] | SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Commercial loans		354
Five Rated [Member] | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	3,349	6,858
Five Rated [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	2,581	5,033
Six Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	3,568	2,698
Six Rated [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	1,201	532
Six Rated [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	1,712	1,525
Six Rated [Member] | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	57	244
Six Rated [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	598	397
Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	73,729	111,529
Impaired [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	19,123	20,740
Impaired [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	21,989	41,822
Impaired [Member] | SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	2,078
Impaired [Member] | SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Commercial loans		4,777
Impaired [Member] | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	5,609	10,782
Impaired [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	24,930	33,408
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	2,378,859	2,329,102
Pass [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	837,555	801,184
Pass [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	1,041,034	1,061,100
Pass [Member] | SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	117
Pass [Member] | SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Commercial loans		717
Pass [Member] | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	106,424	93,221
Pass [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	390,541	369,453
Pass [Member] | Leases
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	3,188	3,427
Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	2,472,408	2,473,220
Recorded Investment [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	859,753	828,511
Recorded Investment [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	1,073,183	1,116,038
Recorded Investment [Member] | SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	2,195
Recorded Investment [Member] | SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Commercial loans		5,848
Recorded Investment [Member] | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	115,439	111,105
Recorded Investment [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	418,650	408,291
Recorded Investment [Member] | Leases
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	$3,188	$3,427

Loans_TDR_Number_of_Contracts_

Loans - TDR Number of Contracts Modified And Recorded Investment (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
	contracts	contracts
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	450	496
Total Recorded Investment Modified as TDRs During Period	$8,395	$18,467
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	30	34
Total Recorded Investment Modified as TDRs During Period	723	1,341
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	11	22
Total Recorded Investment Modified as TDRs During Period	2,438	8,563
SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	0
SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts		0
Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	2	3
Total Recorded Investment Modified as TDRs During Period	206	98
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	0	0
Installment
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	2	4
Total Recorded Investment Modified as TDRs During Period	56	51
Commercial
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	9	15
Total Recorded Investment Modified as TDRs During Period	866	2,552
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	46	62
Total Recorded Investment Modified as TDRs During Period	2,357	4,245
HELOC
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	10	16
Total Recorded Investment Modified as TDRs During Period	326	175
Installment
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	10	13
Total Recorded Investment Modified as TDRs During Period	121	292
Consumer
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	330	327
Total Recorded Investment Modified as TDRs During Period	1,302	1,150
Accruing
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	1,946	3,093
Accruing | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	292	7
Accruing | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	1,184
Accruing | Mortgage
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	0	0
Accruing | Installment
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	0	26
Accruing | Mortgage
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	32	1,967
Accruing | HELOC
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	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	244	805
Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	6,449	15,374
Nonaccrual | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	431	1,334
Nonaccrual | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	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	866	2,552
Nonaccrual | Mortgage
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	2,325	2,278
Nonaccrual | HELOC
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	241	0
Nonaccrual | Installment
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	12	179
Nonaccrual | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	$1,058	$345

Loans_Recorded_Investment_in_F

Loans - Recorded Investment in Financing Receivable Modified as TDR Within 12 Month (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	contracts	contracts
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	86	132
Recorded Investment	$2,009,000	$7,379,000
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	4	11
Recorded Investment	206,000	771,000
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	1	11
Recorded Investment	302,000	2,839,000
SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	0	0
Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	0	0
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	0	0
Recorded Investment	0
Installment
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	0	1
Recorded Investment	0	10,000
Commercial
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	1	4
Recorded Investment	3,000	1,683,000
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	14	26
Recorded Investment	810,000	1,533,000
HELOC
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	2	0
Recorded Investment	160,000
Installment
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	2	5
Recorded Investment	12,000	72,000
Leases
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	62	74
Recorded Investment	516,000	471,000
Leases
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	0	0
Recorded Investment	$0

Allowance_for_Loan_Losses_Allo

Allowance for Loan Losses - Allowance Calculation at the Segment Level and Adjusted Beginning Balance for the Allowance for Credit Losses (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Reserve Estimate Methodology, Historical Loss Period Factor	72 months
Beginning balance	$59,468	$55,537	$68,444
Charge-offs	24,780	19,153	61,268
Recoveries	-26,997	-19,669	-12,942
Net charge-offs (recoveries)	-2,217	-516	48,326
Provision (Recovery)	-7,333	3,415	35,419
Ending balance	54,352	59,468	55,537
Commercial, financial and agricultural
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	14,218	15,635	16,950
Charge-offs	3,779	6,160	26,847
Recoveries	-1,003	-1,314	-1,066
Net charge-offs (recoveries)	2,776	4,846	25,781
Provision (Recovery)	-723	3,429	24,466
Ending balance	10,719	14,218	15,635
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	15,899	11,736	15,539
Charge-offs	8,003	1,832	10,454
Recoveries	-7,759	-726	-783
Net charge-offs (recoveries)	244	1,106	9,671
Provision (Recovery)	-6,847	5,269	5,868
Ending balance	8,808	15,899	11,736
Construction real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	6,855	6,841	14,433
Charge-offs	1,316	1,791	9,985
Recoveries	-12,572	-9,378	-2,979
Net charge-offs (recoveries)	-11,256	-7,587	7,006
Provision (Recovery)	-9,459	-7,573	-586
Ending balance	8,652	6,855	6,841
Residential real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	14,251	14,759	15,692
Charge-offs	3,944	3,207	8,607
Recoveries	-2,985	-6,000	-5,559
Net charge-offs (recoveries)	959	-2,793	3,048
Provision (Recovery)	1,480	-3,301	2,115
Ending balance	14,772	14,251	14,759
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	8,245	6,566	5,830
Charge-offs	7,738	6,163	5,375
Recoveries	-2,671	-2,249	-2,555
Net charge-offs (recoveries)	5,067	3,914	2,820
Provision (Recovery)	8,223	5,593	3,556
Ending balance	11,401	8,245	6,566
Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	0	0	0
Charge-offs	0	0	0
Recoveries	-7	-2	0
Net charge-offs (recoveries)	-7	-2	0
Provision (Recovery)	-7	-2	0
Ending balance	$0	$0	$0

Allowance_for_Loan_Losses_Comp

Allowance for Loan Losses - Composition of the Allowance for Loan Losses (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	$54,352		$59,468		$55,537	$68,444
Ending allowance balance attributed to loans
Individually evaluated for impairment	3,660		10,451
Collectively evaluated for impairment	50,692		49,017
Total ending allowance balance	54,352		59,468
Loan Balance:
Loans individually evaluated for impairment	73,676		112,304
Loans collectively evaluated for impairment	4,756,006		4,508,201
Total ending loan balance	4,829,682		4,620,505
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment	4.97%		9.31%
Loans collectively evaluated for impairment	1.07%		1.09%
Total	1.13%		1.29%
Recorded Investment:
Loans individually evaluated for impairment	73,712		112,315
Loans collectively evaluated for impairment	4,769,599		4,521,684
Recorded Investment	4,843,311		4,633,999
Financing Receivable, Allowance for Credit Losses, Write-downs	24,780		19,153		61,268
Financing Receivable, Allowance for Credit Losses, Recovery	-26,997		-19,669		-12,942
Financing Receivables Allowance For Credit Losses Net Charge Offs	-2,217		-516		48,326
Provision for Loan, Lease, and Other Losses	-7,333		3,415		35,419
Commercial, financial and agricultural
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	10,719		14,218		15,635	16,950
Ending allowance balance attributed to loans
Individually evaluated for impairment	981		3,268
Collectively evaluated for impairment	9,738		10,950
Total ending allowance balance	10,719		14,218
Loan Balance:
Loans individually evaluated for impairment	19,103		20,724
Loans collectively evaluated for impairment	837,432		804,708
Total ending loan balance	856,535	[1]	825,432	[1]
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment	5.14%		15.77%
Loans collectively evaluated for impairment	1.16%		1.36%
Total	1.25%		1.72%
Recorded Investment:
Loans individually evaluated for impairment	19,106		20,727
Loans collectively evaluated for impairment	840,647		807,784
Recorded Investment	859,753	[1]	828,511	[1]
Financing Receivable, Allowance for Credit Losses, Write-downs	3,779		6,160		26,847
Financing Receivable, Allowance for Credit Losses, Recovery	-1,003		-1,314		-1,066
Financing Receivables Allowance For Credit Losses Net Charge Offs	2,776		4,846		25,781
Provision for Loan, Lease, and Other Losses	-723		3,429		24,466
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	8,808		15,899		11,736	15,539
Ending allowance balance attributed to loans
Individually evaluated for impairment	262		5,496
Collectively evaluated for impairment	8,546		10,403
Total ending allowance balance	8,808		15,899
Loan Balance:
Loans individually evaluated for impairment	21,978		41,816
Loans collectively evaluated for impairment	1,047,659		1,070,457
Total ending loan balance	1,069,637	[1]	1,112,273	[1]
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment	1.19%		13.14%
Loans collectively evaluated for impairment	0.82%		0.97%
Total	0.82%		1.43%
Recorded Investment:
Loans individually evaluated for impairment	21,989		41,822
Loans collectively evaluated for impairment	1,051,194		1,074,216
Recorded Investment	1,073,183	[1]	1,116,038	[1]
Financing Receivable, Allowance for Credit Losses, Write-downs	8,003		1,832		10,454
Financing Receivable, Allowance for Credit Losses, Recovery	-7,759		-726		-783
Financing Receivables Allowance For Credit Losses Net Charge Offs	244		1,106		9,671
Provision for Loan, Lease, and Other Losses	-6,847		5,269		5,868
Construction real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	8,652		6,855		6,841	14,433
Ending allowance balance attributed to loans
Individually evaluated for impairment	1,812		1,132
Collectively evaluated for impairment	6,840		5,723
Total ending allowance balance	8,652		6,855
Loan Balance:
Loans individually evaluated for impairment	7,690		15,559
Loans collectively evaluated for impairment	148,114		140,557
Total ending loan balance	155,804		156,116
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment	23.56%		7.28%
Loans collectively evaluated for impairment	4.62%		4.07%
Total	5.55%		4.39%
Recorded Investment:
Loans individually evaluated for impairment	7,687		15,559
Loans collectively evaluated for impairment	148,512		140,944
Recorded Investment	156,199		156,503
Financing Receivable, Allowance for Credit Losses, Write-downs	1,316		1,791		9,985
Financing Receivable, Allowance for Credit Losses, Recovery	-12,572		-9,378		-2,979
Financing Receivables Allowance For Credit Losses Net Charge Offs	-11,256		-7,587		7,006
Provision for Loan, Lease, and Other Losses	-9,459		-7,573		-586
Residential real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	14,772		14,251		14,759	15,692
Ending allowance balance attributed to loans
Individually evaluated for impairment	605		555
Collectively evaluated for impairment	14,167		13,696
Total ending allowance balance	14,772		14,251
Loan Balance:
Loans individually evaluated for impairment	24,905		33,406
Loans collectively evaluated for impairment	1,826,470		1,766,141
Total ending loan balance	1,851,375		1,799,547
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment	2.43%		1.66%
Loans collectively evaluated for impairment	0.78%		0.78%
Total	0.80%		0.79%
Recorded Investment:
Loans individually evaluated for impairment	24,930		33,408
Loans collectively evaluated for impairment	1,829,931		1,769,604
Recorded Investment	1,854,861		1,803,012
Financing Receivable, Allowance for Credit Losses, Write-downs	3,944		3,207		8,607
Financing Receivable, Allowance for Credit Losses, Recovery	-2,985		-6,000		-5,559
Financing Receivables Allowance For Credit Losses Net Charge Offs	959		-2,793		3,048
Provision for Loan, Lease, and Other Losses	1,480		-3,301		2,115
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	11,401		8,245		6,566	5,830
Ending allowance balance attributed to loans
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	11,401		8,245
Total ending allowance balance	11,401		8,245
Loan Balance:
Loans individually evaluated for impairment	0		799
Loans collectively evaluated for impairment	893,160		722,934
Total ending loan balance	893,160		723,733
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment	0.00%		0.00%
Loans collectively evaluated for impairment	1.28%		1.14%
Total	1.28%		1.14%
Recorded Investment:
Loans individually evaluated for impairment	0		799
Loans collectively evaluated for impairment	896,127		725,709
Recorded Investment	896,127		726,508
Financing Receivable, Allowance for Credit Losses, Write-downs	7,738		6,163		5,375
Financing Receivable, Allowance for Credit Losses, Recovery	-2,671		-2,249		-2,555
Financing Receivables Allowance For Credit Losses Net Charge Offs	5,067		3,914		2,820
Provision for Loan, Lease, and Other Losses	8,223		5,593		3,556
Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	0		0		0	0
Ending allowance balance attributed to loans
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	0		0
Total ending allowance balance	0		0
Loan Balance:
Loans individually evaluated for impairment	0		0
Loans collectively evaluated for impairment	3,171		3,404
Total ending loan balance	3,171		3,404
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment	0.00%		0.00%
Loans collectively evaluated for impairment	0.00%		0.00%
Total	0.00%		0.00%
Recorded Investment:
Loans individually evaluated for impairment	0		0
Loans collectively evaluated for impairment	3,188		3,427
Recorded Investment	3,188		3,427
Financing Receivable, Allowance for Credit Losses, Write-downs	0		0		0
Financing Receivable, Allowance for Credit Losses, Recovery	-7		-2		0
Financing Receivables Allowance For Credit Losses Net Charge Offs	-7		-2		0
Provision for Loan, Lease, and Other Losses	($7)		($2)		$0
[1]	Included within commercial, financial and agricultural loans, commercial real estate loans, and SEPH commercial land and development loans were 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, 2014	Dec. 31, 2013	Sep. 30, 2014
Loans Held for Sale [Line Items]
Disposal Group, Including Discontinued Operation, Mortgage Loans	$5,264,000	$1,666,000
Loans Held-for-sale, Mortgages, Contractual Balance	5,200,000	1,600,000
Expected Gain (Loss) on Sale of Mortgage Loans	80,000	28,000
Commercial Portfolio Segment [Member]
Loans Held for Sale [Line Items]
Loans held for sale - lower of cost or market			22,000,000
Gain (Loss) on Sale of Loans and Leases	$1,900,000

Premises_And_Equipment_Narrati

Premises And Equipment - Narrative (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$7.20	$7.30	$7
Rent expense	$1.70	$1.80	$1.90

Premises_And_Equipment_Major_C

Premises And Equipment - Major Categories of Premises and Equipment (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]
Premises and Equipment, Gross	$134,416	$128,680
Less accumulated depreciation	-78,937	-73,402
Premises and equipment, net	55,479	55,278
Land
Property, Plant and Equipment [Line Items]
Premises and Equipment, Gross	17,836	17,657
Buildings
Property, Plant and Equipment [Line Items]
Premises and Equipment, Gross	71,002	70,183
Equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Premises and Equipment, Gross	42,139	36,937
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and Equipment, Gross	$3,439	$3,903

Premises_And_Equipment_Schedul

Premises And Equipment - Schedule of Future Minimum Rental Payments Under Operating Leases (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2014	$1,143
2015	755
2016	559
2017	448
2018	367
Thereafter	252
Total	$3,524

Deposits_Narrative_Details

Deposits - Narrative (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Deposits [Abstract]
Deposits received from executive officers, directors, and their related interests	$21.90	$18.40

Deposits_Summary_of_Noninteres

Deposits - Summary of Noninterest Bearing and Interest Bearing Deposits (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deposits [Abstract]
Non-interest bearing	$1,269,296	$1,193,553
Interest bearing	3,858,704	3,596,441
Total deposits	$5,128,000	$4,789,994	$4,716,032

Deposits_Time_Deposits_Details

Deposits - Time Deposits (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Time Deposits, Fiscal Year Maturity [Abstract]
2013	$823,230
2014	254,565
2015	145,321
2016	42,160
2017	144,133
After 5 years	502
Total	$1,409,911

Deposits_Maturities_of_Time_De

Deposits - Maturities of Time Deposits (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Time Deposits, $250,000 or more	$265,243
3 months or less	210,386
Contractual Maturities, Time Deposits, $250,000 or More, Three months or less	18,927
Over 3 months through 6 months	93,168
Contractual Maturities, Time Deposits, $250,000 or More, Over Three months to Six months	11,954
Over 6 months through 12 months	132,344
Contractual Maturities, Time Deposits, $250,000 or More, Over Six months to Twelve months	10,470
Over 12 months	323,295
Contractual Maturities, Time Deposits, $250,000 or More, Over Twelve months	223,892
Total	$759,193

ShortTerm_Borrowings_Narrative

Short-Term Borrowings - Narrative (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
FHLB Advances
Short-term Debt [Line Items]
Commercial real estate and residential mortgage loans pledged under blanket agreement	$2,038	$2,072
Repurchase agreements and Federal Funds Purchased
Short-term Debt [Line Items]
Securities pledged to secure repurchase agreements	$664	$648

ShortTerm_Borrowings_Schedule_

Short-Term Borrowings - Schedule of Short-Term Borrowings (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Short-term Debt [Line Items]
Securities sold under agreements to repurchase and federal funds purchased	$276,980	$242,029
FHLB advances	0	0
Total short-term borrowings	276,980	242,029
Repurchase agreements and Federal Funds Purchased
Short-term Debt [Line Items]
Total short-term borrowings	276,980	242,029
Highest month-end balance	307,025	280,863
Average daily balance	262,709	251,868
Weighted-average interest rate:
As of year-end	0.18%	0.19%
Paid during the year	0.19%	0.21%
FHLB Advances
Short-term Debt [Line Items]
Total short-term borrowings	0	0
Highest month-end balance	0	0
Average daily balance	$561	$1,255
Weighted-average interest rate:
As of year-end	0.00%	0.00%
Paid during the year	0.10%	0.41%

LongTerm_Debt_Narrative_Detail

Long-Term Debt - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Nov. 30, 2012
Debt Instrument [Line Items]
Gains (Losses) on Restructuring of Debt	$3,200,000
prepayment penalty amount remaining to amortize	3,100,000
Amortization of prepayment penalty on long term debt	5,031,000	4,835,000	0
Prepayment Penalty, Future Amortization Expense [Abstract]
Prepayment penalty	-17,941,000	-19,766,000
Long-term debt with contractual maturity longer than five years	176,161,000	151,330,000
Long term debt, callable by the issuer	150,000,000
FHLB Debt Amount Restructured	50,000,000
Broker Repurchase Agreements
Debt Instrument [Line Items]
Debt repurchased during period				300,000,000
Debt repurchased during period, rate				1.75%
Total prepayment penalty	25,000,000
Effective interest rate percentage	3.55%
Prepayment Penalty, Future Amortization Expense [Abstract]
Prepayment penalty	14,800,000
Payments of Debt Extinguishment Costs, Amount to be Amortized in Year Two	5,000,000
Payments of Debt Extinguishment Costs, Amount to be Amortized in Year Three	5,100,000
Payments of Debt Extinguishment Costs, Amount to be Amortized in Year Four	4,700,000
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	1,000,000
Payments of Debt Extinguishment Costs, Amount to be Amortized in Year Three	1,100,000
Payments of Debt Extinguishment Costs, Amount to be Amortized in Year Four	$1,000,000

LongTerm_Debt_Schedule_of_long

Long-Term Debt - Schedule of long-Term Debt (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Long-term Debt, Fiscal Year Maturity [Abstract]
2015	$51,000	$100,500
2016	26,000	51,000
2017	351,000	26,000
2018	125,049	351,000
2019	75,333	125,062
2020		25,415
Thereafter	176,161	151,330
Total long-term debt, excluding prepayment penalty	804,543	830,307
Prepayment penalty	17,941	19,766
Total long-term debt	786,602	810,541
Long-term Debt, Fiscal Year Maturity, Average Rate [Abstract] [Abstract]
2015	2.00%	1.51%
2016	0.92%	2.00%
2017	1.68%	0.92%
2018	2.11%	1.99%
2019	1.97%	2.11%
2020		1.94%
Long-term Debt, Maturities, Repayments of Principal after Year Five	176,161
Thereafter		3.33%
Average rate, total, excluding prepayment penalty	2.09%	2.16%
Average rate, total	2.89%	2.79%
Long Term Debt Maturities Average Rate In After Year Five	3.16%
FHLB Advances
Long-term Debt, Fiscal Year Maturity [Abstract]
2015	51,000	100,500
2016	26,000	51,000
2017	51,000	26,000
2018	125,049	51,000
2019	75,333	125,062
2020		25,415
Thereafter		151,330
Total long-term debt, excluding prepayment penalty	504,543	530,307
Long-term Debt, Fiscal Year Maturity, Average Rate [Abstract] [Abstract]
2015	2.00%	1.51%
2016	0.92%	2.00%
2017	1.28%	0.92%
2018	2.11%	3.37%
2019	1.97%	2.11%
2020		1.94%
Long-term Debt, Maturities, Repayments of Principal after Year Five	176,161
Thereafter		3.33%
Average rate, total, excluding prepayment penalty	2.30%	2.39%
Long Term Debt Maturities Average Rate In After Year Five	3.16%
Broker Repurchase Agreements
Long-term Debt, Fiscal Year Maturity [Abstract]
2017	300,000
2018		300,000
Total long-term debt, excluding prepayment penalty	300,000	300,000
Prepayment penalty	($14,800)
Long-term Debt, Fiscal Year Maturity, Average Rate [Abstract] [Abstract]
2017	1.75%
2018		1.75%
Average rate, total, excluding prepayment penalty	1.75%	1.75%

Subordinated_DebenturesNotes_D

Subordinated Debentures/Notes (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 23, 2009	Apr. 20, 2012
			purchaser	purchaser
Subordinated notes	$45,000,000	$80,250,000
Number of purchasers			38
Trust I
Preferred securities issued	15,000,000
Junior subordinated notes
Junior subordinated debt purchased by Trust I	15,500,000
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	35,250,000
Portion of principal amount purchased by related parties	14,050,000
Interest rate	10.00%
Subordinated debt | 7% Subordinated notes due April 20, 2022
Subordinated borrowing, number of purchasers				56
Aggregate principal amount				$30,000,000
Interest rate	7.00%
Purchase price as a percentage of principal amount				100.00%
Repurchase amount as a percentage of principal				100.00%

ShareBased_Compensation_Narrat

Share-Based Compensation - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$458,000	$0
2005 Stock Incentive Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares authorized for delivery upon the exercise of incentive stock options		1,500,000
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
Common shares available for future grants under the 2005 Plan	557,275
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	21,975
Allocated Share-based Compensation Expense	801,000	850,000
Common Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock Reissued Shares For Director Grants	10,200	10,550	6,120
Allocated Share-based Compensation Expense	458,000
Scenario, Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense				$1,200,000

Benefit_Plans_Narrative_Detail

Benefit Plans - Narrative (Details) (USD $)	1 Months Ended		12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2015	Nov. 17, 2009
Defined Benefit Plan Disclosure [Line Items]
Company contributions	$12,638,000		$0	$12,638,000
Company contributions deductible on the 2012 tax return		11,000,000
Company Contribution Deductible On Two Thousand Thirteen Tax Return	1,600,000
Accumulated benefit obligation for the pension plan			92,000,000	75,900,000
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			10,200,000	9,900,000
Fair value of common shares held by pension plan, per share			$88.48	$85.07
Estimated net actuarial (loss) expected to be recognized in the next fiscal year			0	-2,703,000	-1,708,000
Expected long-term return on plan assets			7.25%	7.50%	7.75%
Cash balance in bank			1,900,000
Market value of pension plan assets			160,600,000	152,700,000
Defined Contribution Plan, Cost Recognized			1,100,000	1,100,000	1,000,000
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			15,000
S&P 500 Index
Defined Benefit Plan Disclosure [Line Items]
Expected long-term rate of return on plan assets			7.25%
Supplemental Executive Retirement Plan (SERP)
Defined Benefit Plan Disclosure [Line Items]
Benefit expense			200,000	200,000	300,000
Accrued benefit cost			7,600,000	6,800,000
Level 1
Defined Benefit Plan Disclosure [Line Items]
Equity investments			141,100,000	128,700,000
Level 2
Defined Benefit Plan Disclosure [Line Items]
Equity investments			19,500,000	24,000,000
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						$637,000

Benefit_Plans_Plan_Assets_and_

Benefit Plans - Plan Assets and Benefit Obligation Activity (Details) (USD $)	1 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Jan. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in fair value of plan assets
Fair value at beginning of measurement period	$117,768	$152,739	$117,768
Actual return on plan assets		15,511	31,518
Company contributions	12,638	0	12,638
Benefits paid		-7,652	-9,185
Fair value at end of measurement period		160,598	152,739	117,768
Change in benefit obligation
Projected benefit obligation at beginning of measurement period	97,653	89,179	97,653
Service cost		4,331	4,817	4,271
Interest cost		4,577	4,223	4,048
Actuarial (gains) loss		18,893	-8,329
Benefits paid		-7,652	-9,185
Projected benefit obligation at the end of measurement period		109,328	89,179	97,653
Funded status at end of year (fair value of plan assets less benefit obligation)		$51,270	$63,560

Benefit_Plans_Asset_Allocation

Benefit Plans - Asset Allocation for the Pension Plan by Asset Category (Details)	Dec. 31, 2014	Dec. 31, 2013
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%	83.00%
Fixed income and cash equivalents
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual Plan Asset Allocations	15.00%	17.00%

Benefit_Plans_Weighted_Average

Benefit Plans - Weighted Average Assumptions Used to Determine Benefit Obligations (Details)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.42%	5.30%	4.47%
Rate of compensation increase			3.00%
Under age 30 [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	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%
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%

Benefit_Plans_Estimated_Future

Benefit Plans - Estimated Future Pension Benefit Payments (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
2013	$6,282
2014	6,236
2015	6,902
2016	7,081
2017	7,799
2018-2022	46,850
Total	$81,150

Benefit_Plans_Balances_of_Accu

Benefit Plans - Balances of Accumulated Other Comprehensive Income (Loss) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Prior service cost	$15	$34
Net actuarial loss	-22,855	-8,579
Total	-22,870	-8,613
Deferred taxes	-8,005	-3,015
Accumulated other comprehensive loss	($14,865)	($5,598)

Benefit_Plans_Components_of_Ne

Benefit Plans - Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Loss) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of net periodic benefit cost
Service cost	($4,331,000)	($4,817,000)	($4,271,000)
Interest cost	-4,577,000	-4,223,000	-4,048,000
Expected return on plan assets	10,869,000	9,536,000	8,742,000
Net periodic benefit income (cost)	-1,942,000	2,227,000	1,305,000
Other amounts recognized in other comprehensive (Loss)
Change to net actuarial (loss) gain for the period	-14,276,000	30,409,000	-11,236,000
Amortization of prior service cost	-19,000	-20,000	-20,000
Defined Benefit Plan, Future Amortization of Gain (Loss)	0	-2,703,000	-1,708,000
Amortization of net loss	0	2,703,000	1,708,000
Total recognized in other comprehensive (loss) income	-14,257,000	33,132,000	-9,508,000
Total recognized in net benefit cost and other comprehensive (loss) income	($12,315,000)	$30,905,000	($10,813,000)

Benefit_Plans_Weighted_Average1

Benefit Plans - Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount Rate	5.30%	4.47%	5.18%
Rate of compensation increase			3.00%
Expected long-term return on plan assets	7.25%	7.50%	7.75%

Income_Taxes_Narrative_Details

Income Taxes - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Statutory federal corporate tax rate	35.00%	35.00%	35.00%
Unrecognized tax benefits that, if recognized, would favorably affect the effective income tax rate	$413,000	$403,000	$404,000
(Income)/expense related to interest and penalties	0	-500	4,500
Accrued amount for interest and penalties	$67,000	$67,000	$67,500

Income_Taxes_Components_of_Def

Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Deferred tax assets:
Allowance for loan losses	$19,023	$20,814
Accumulated other comprehensive loss – Pension Plan	8,005	3,015
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross	0	16,057
Intangible assets	543	673
Deferred compensation	3,820	3,611
OREO devaluations	3,984	5,287
Partnership adjustments	4,725	3,793
Deferred Tax Assets, Deferred Income	933	282
Other	3,795	3,423
Total deferred tax assets	44,828	56,955
Deferred tax liabilities:
Accumulated other comprehensive income – Unrealized gains on securities	677	0
Deferred investment income	10,199	10,199
Pension Plan	25,949	25,261
Mortgage servicing rights	3,015	3,154
Other	804	850
Total deferred tax liabilities	40,644	39,464
Net deferred tax assets	$4,184	$17,491

Income_Taxes_Components_of_the

Income Taxes - Components of the Provision for Federal and State Income Taxes (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Currently payable
Federal	$27,039	$27,587	$12,984
Deferred
Federal	1,563	-2,456	12,717
Total	$28,602	$25,131	$25,701

Income_Taxes_Reconciliation_of

Income Taxes - Reconciliation of Federal Income Tax Expense (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
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%	-0.80%	-0.90%
Bank owned life insurance	-1.50%	-1.70%	-1.60%
Tax credits (low income housing)	-6.30%	-6.60%	-6.10%
Other	-1.30%	-1.30%	-1.80%
Effective tax rate	25.40%	24.60%	24.60%

Income_Taxes_Reconciliation_of1

Income Taxes - Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
January 1 Balance	$518	$517	$485
Additions based on tax positions related to the current year	76	74	74
Additions for tax positions of prior years	14	4	25
Reductions for tax positions of prior years	0	0	0
Reductions due to statute of limitations	-76	-77	-67
December 31 Balance	$532	$518	$517

Other_Comprehensive_Income_Los2

Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	$19	$2,723
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax	7	953
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	14,865	5,598	-27,134	20,954
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	1,257	-29,821	9,616	12,673
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	0	0	0	-550
Accumulated Other Comprehensive Income (Loss), Net of Tax	-13,608	-35,419	-17,518	-8,831
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	-9,267	21,536	-6,180
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	31,078	-39,437	-3,057
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	-9,279	19,766	-7,303
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax	30,325	-39,448	-3,092
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	0	0	550
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	21,046	-19,682
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax	12	1,770	1,123
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	765	1,781
Other Comprehensive Income (Loss), Net of Tax	21,811	-17,901	-8,687
Gain (Loss) on Sale of Investments	1,158	0	0
Other than Temporary Impairment Losses, Investments	0	17	54
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax	1,158	17
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	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	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	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	$0	$2,703

Earnings_Per_Common_Share_Summ

Earnings Per Common Share - Summary of Computation of Basic and Diluted Earnings Per Common Share (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Net income available to common shareholders	$84,090	$77,227	$75,205
Denominator:
Weighted-average shares	15,394,971	15,412,365	15,407,078
Effect of dilutive securities – restricted stock units and warrants	18,861	0	1,063
Earnings per common share:	15,413,832	15,412,365	15,408,141
Earnings per common share:
Basic earnings per common share	$5.46	$5.01	$4.88
Diluted earnings per common share	$5.46	$5.01	$4.88

Earnings_Per_Common_Share_Narr

Earnings Per Common Share - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Class of Warrant or Right [Line Items]
Weighted Average Number Diluted Shares Outstanding Adjustment	18,861	0	1,063
Options and warrants not included in computation of diluted earnings per common shares			63,308
Dilutive effect of Capital Purchase Plan warrants			1,063
Exercise price of Capital Purchase Plan warrants to purchase common shares		$65.97
U.S. Treasury's Capital Purchase Program
Class of Warrant or Right [Line Items]
Warrants to purchase common shares outstanding related to common stock issuances		227,376	227,376
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	21,975

Dividend_Restrictions_Details

Dividend Restrictions (Details) (USD $)	Dec. 31, 2014
In Millions, unless otherwise specified
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Amount available for dividend distribution without prior approval from regulatory authority	$86.70

Financial_Instruments_With_Off2

Financial Instruments With Off-Balance Sheet Risk And Financial Instruments With Concentrations Of Credit Risk (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Risks and Uncertainties [Abstract]
Loan commitments	$885,052	$821,795
Standby letters of credit	$12,473	$20,590

Loan_Servicing_Narrative_Detai

Loan Servicing - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Servicing Assets at Fair Value [Line Items]
Mortgage Servicing Rights Fair Value	$9,057,000	$9,546,000
Transfers and Servicing of Financial Assets [Abstract]
Serviced sold mortgage loans	1,265,000,000	1,326,000,000	1,311,000,000
Serviced sold mortgage loans with recourse	7,000,000	10,700,000
Mortgage loans sold with recourse, reserve	379,000	1,000,000
Mortgage servicing rights, discount rate	10.00%	10.00%
Servicing fees included in other service income	$3,500,000	$3,600,000	$3,600,000
Minimum
Transfers and Servicing of Financial Assets [Abstract]
Mortgage servicing rights, constant prepayment speeds	5.70%	6.60%
Maximum
Transfers and Servicing of Financial Assets [Abstract]
Mortgage servicing rights, constant prepayment speeds	22.30%	22.50%

Loan_Servicing_Activity_for_MS

Loan Servicing - Activity for MSRs And Related Valuation Allowance (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Mortgage servicing rights:
Carrying amount, net, beginning of year	$9,013	$7,763	$9,301
Additions	1,026	2,436	3,399
Amortization	-1,631	-2,479	-3,634
Change in valuation allowance	205	1,293	-1,303
Carrying amount, net, end of year	8,613	9,013	7,763
Valuation allowance:
Beginning of year	1,031	2,324	1,021
Change in valuation allowance	-205	-1,293	1,303
End of year	$826	$1,031	$2,324

Fair_Values_Narrative_Details

Fair Values - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
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	$32,480,000	$63,272,000
Allowance for loans individually evaluated for impairment	3,660,000	10,451,000
Book Value Of Impaired Loans Carried At Fair Value	19,643,000	41,002,000
Impaired loans carried at fair value	16,963,000	33,819,000
Impaired Financing Receivable, Related Allowance	3,660,000	10,451,000
Impaired Financing Receivable, carried at fair value, related expense	3,000,000	8,100,000	16,000,000
MSR recorded at lower of cost or fair value	8,613,000	9,013,000	7,763,000	9,301,000
Servicing Asset at Fair Value, Amount	2,900,000	2,300,000
Mortgage Servicing Rights, at fair value	9,057,000	9,546,000
Valuation allowance of MSR	826,000	1,031,000	2,324,000	1,021,000
MSRs recorded at cost	5,700,000	6,700,000
Valuation allowance for impairment of recognized servicing assets, provisions (recoveries)	205,000	1,293,000	-1,303,000
Other Real Estate, Foreclosed Assets, and Repossessed Assets	22,605,000	34,636,000
Percent of OREO held at fair value	46.00%	53.00%
Estimated fair value of other real estate owned (OREO)	10,300,000	18,500,000
OREO devaluations	2,406,000	3,180,000	6,872,000
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	$2,680,000	$7,183,000

Fair_Values_Assets_and_Liabili

Fair Values - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage Loans Held for Sale	$5,264	$1,666
Mortgage IRLCs	70	61
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	5,264	1,666
Mortgage IRLCs	70	61
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	135
Fair value swap | Level 3
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swaps, fair value	226	135
Recurring basis
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage Loans Held for Sale	5,264	1,666
Mortgage IRLCs	70	61
Recurring basis | Level 2
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage Loans Held for Sale	5,264	1,666
Mortgage IRLCs	70	61
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	538,064	525,136
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	538,064	525,136
Recurring basis | U.S. Government Sponsored Entities’ Asset-Backed Securities
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment Securities	761,153	648,471
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	761,153	648,471
Recurring basis | Equity securities
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment Securities	2,698	2,659
Recurring basis | Equity securities | Level 1
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment Securities	1,922	1,900
Recurring basis | Equity securities | Level 3
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment Securities	776	759
Recurring basis | Fair value swap
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swaps, fair value	226	135
Recurring basis | Fair value swap | Level 3
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swaps, fair value	$226	$135

Fair_Values_Reconciliation_of_

Fair Values - Reconciliation of the Level 3 Inputs for Financial Instruments Measured on a Recurring Basis (Details) (Recurring basis, Level 3, USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$759	$780
Total Gains (Losses)
Included in earnings - realized	0	-17
Included in earnings - unrealized	0	0
Included in other comprehensive income	17	-4
Purchases, sales, issuances and settlements, other, net	0	0
Re-evaluation of fair value swap		0
Ending balance	776	759
Fair Value Swap
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	-135	-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	0
Ending Balance	($226)	($135)

Fair_Values_Assets_and_Liabili1

Fair Values - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	$16,963	$33,819
Mortgage Servicing Rights	2,900	2,300
Other loans	4,757,461	4,531,680
Level 1
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value		0
Level 2
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value		0
Level 3
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	16,963	33,819
Other loans	4,757,461	4,531,680
Nonrecurring basis
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	16,963	33,819
Mortgage Servicing Rights	2,928	2,259
Other loans	10,312	18,526
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	2,928	2,259
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	16,963	33,819
Other loans	10,312	18,526
Nonrecurring basis | Commercial real estate
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	8,481	21,100
Other loans	1,470	4,119
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	8,481	21,100
Other loans	1,470	4,119
Nonrecurring basis | Construction real estate
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans	6,473	11,041
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	6,473	11,041
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 | SEPH commercial land and development
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value		4,777
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		4,777
Nonrecurring basis | Remaining commercial
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	3,483	3,788
Nonrecurring basis | Remaining commercial | Level 3
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	3,483	3,788
Nonrecurring basis | Residential real estate
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	2,921	4,154
Other loans	2,369	3,366
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	2,921	4,154
Other loans	$2,369	$3,366

Fair_Values_Qualitative_Inform

Fair Values - Qualitative Information About Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on a Non-recurring Basis (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	16,963	33,819
Other real estate owned	4,757,461	4,531,680
Nonrecurring basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	16,963	33,819
Other real estate owned	10,312	18,526
Commercial real estate | Nonrecurring basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	8,481	21,100
Other real estate owned	1,470	4,119
Commercial real estate | Nonrecurring basis | Loans receivable
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	8,481	21,100
Construction real estate | Nonrecurring basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other real estate owned	6,473	11,041
SEPH commercial land and development | Nonrecurring basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	2,078
SEPH commercial land and development | Nonrecurring basis | Loans receivable
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	2,078	4,777
Remaining commercial | Nonrecurring basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	3,483	3,788
Remaining commercial | Nonrecurring basis | Loans receivable
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	3,483	3,788
Residential real estate | Nonrecurring basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	2,921	4,154
Other real estate owned	2,369	3,366
Residential real estate | Nonrecurring basis | Loans receivable
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	2,921	4,154
Commercial real estate | Nonrecurring basis | Other real estate owned
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other real estate owned	1,470	4,119
Construction real estate | Nonrecurring basis | Other real estate owned
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other real estate owned	6,473	11,041
Residential Real Estate | Nonrecurring basis | Other real estate owned
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other real estate owned	2,369	3,366
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	84.00%	109.00%
Sales comparison approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	38.80%	22.80%
Sales comparison approach | SEPH commercial land and development | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	0.00%	0.00%
Sales comparison approach | SEPH commercial land and development | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	35.00%	96.00%
Sales comparison approach | SEPH commercial land and development | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	17.50%	13.90%
Sales comparison approach | Remaining commercial | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	0.00%	0.00%
Sales comparison approach | Remaining commercial | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	76.00%	40.00%
Sales comparison approach | Remaining commercial | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	45.40%	22.40%
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	120.60%	121.80%
Sales comparison approach | Residential real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	11.10%	14.90%
Sales comparison approach | Commercial real estate | Low | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	0.00%	0.00%
Sales comparison approach | Commercial real estate | High | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	87.00%	140.00%
Sales comparison approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	30.50%	17.70%
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	82.90%	484.00%
Sales comparison approach | Construction real estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	27.10%	36.20%
Sales comparison approach | Residential Real Estate | Low | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	0.00%	0.00%
Sales comparison approach | Residential Real Estate | High | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	38.30%	273.00%
Sales comparison approach | Residential Real Estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	10.10%	19.20%
Income approach | Commercial real estate | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Capitalization rate	8.00%	8.00%
Income approach | Commercial real estate | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Capitalization rate	9.50%	12.50%
Income approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Capitalization rate	9.40%	9.10%
Income approach | Residential real estate | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Capitalization rate	7.90%	7.80%
Income approach | Residential real estate | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Capitalization rate	10.00%	10.00%
Income approach | Residential real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Capitalization rate	8.00%	8.40%
Income approach | Commercial real estate | Low | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Capitalization rate	8.40%	8.00%
Income approach | Commercial real estate | High | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Capitalization rate	10.00%	11.50%
Income approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Capitalization rate	9.40%	9.60%
Income approach | Residential Real Estate | Low | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Capitalization rate	6.80%	5.40%
Income approach | Residential Real Estate | High | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Capitalization rate	7.80%	7.80%
Income approach | Residential Real Estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Capitalization rate	7.60%	7.40%
Cost approach | Commercial real estate | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Fair Value Inputs, Accumulated Depreciation	23.00%	11.70%
Cost approach | Commercial real estate | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Fair Value Inputs, Accumulated Depreciation	23.00%	65.00%
Cost approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Fair Value Inputs, Accumulated Depreciation	23.00%	37.10%
Cost approach | Commercial real estate | Low | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Fair Value Inputs, Accumulated Depreciation	60.00%	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%	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%	80.00%
Bulk sale approach | SEPH commercial land and development | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Discount rate	10.80%	11.00%
Bulk sale approach | SEPH commercial land and development | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Discount rate	10.80%	20.00%
Bulk sale approach | SEPH commercial land and development | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Discount rate	10.80%	14.90%
Bulk sale approach | Remaining commercial | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Discount rate	10.00%	11.00%
Bulk sale approach | Remaining commercial | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Discount rate	22.00%	20.00%
Bulk sale approach | Remaining commercial | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Discount rate	16.50%	18.00%
Bulk sale approach | Construction real estate | Low | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Discount rate	15.00%	13.00%
Bulk sale approach | Construction real estate | High | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Discount rate	15.00%	14.00%
Bulk sale approach | Construction real estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Discount rate	15.00%	13.60%

Fair_Values_Fair_Value_of_Fina

Fair Values - Fair Value of Financial Instruments (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financial assets:
Cash and money market instruments	$237,699	$147,030
Investment securities	1,445,405	1,363,668
Mortgage loans held for sale	5,264	1,666
Impaired loans carried at fair value	16,963	33,819
Mortgage IRLCs	70	61
Other loans	4,757,461	4,531,680
Loans receivable, net	4,779,758	4,567,226
Financial liabilities:
Non-interest bearing checking accounts	1,269,296	1,193,553
Interest bearing transaction accounts	1,122,079	1,145,525
Savings accounts	1,325,445	1,124,994
Time Deposits, Fair Value	1,422,885	1,331,129
Other	1,269	1,263
Total deposits	5,140,974	4,796,464
Short-term borrowings	276,980	242,029
Long-term debt	827,500	860,963
Subordinated debentures/notes	42,995	83,140
Fair value swap
Derivative financial instruments:
Swaps, fair value	226	135
Carrying value
Financial assets:
Cash and money market instruments	237,699	147,030
Investment securities	1,442,477	1,358,327
Mortgage loans held for sale	5,264	1,666
Impaired loans carried at fair value	16,963	33,819
Mortgage IRLCs	70	61
Other loans	4,753,033	4,525,491
Loans receivable, net	4,775,330	4,561,037
Financial liabilities:
Non-interest bearing checking accounts	1,269,296	1,193,553
Interest bearing transaction accounts	1,122,079	1,145,525
Savings accounts	1,325,445	1,124,994
Time Deposits, Fair Value	1,409,911	1,324,659
Other	1,269	1,263
Total deposits	5,128,000	4,789,994
Short-term borrowings	276,980	242,029
Long-term debt	786,602	810,541
Subordinated debentures/notes	45,000	80,250
Carrying value | Fair value swap
Derivative financial instruments:
Swaps, fair value	226	135
Level 1
Financial assets:
Cash and money market instruments	237,699	147,030
Investment securities	1,922	1,900
Impaired loans carried at fair value		0
Mortgage IRLCs	0	0
Loans receivable, net	0	0
Financial liabilities:
Non-interest bearing checking accounts	1,269,296	1,193,553
Interest bearing transaction accounts	1,122,079	1,145,525
Savings accounts	1,325,445	1,124,994
Other	1,269	1,263
Total deposits	3,718,089	3,465,335
Level 2
Financial assets:
Investment securities	1,442,708	1,361,009
Mortgage loans held for sale	5,264	1,666
Impaired loans carried at fair value		0
Mortgage IRLCs	70	61
Loans receivable, net	5,334	1,727
Financial liabilities:
Time Deposits, Fair Value	1,422,885	1,331,129
Total deposits	1,422,885	1,331,129
Short-term borrowings	276,980	242,029
Long-term debt	827,500	860,963
Subordinated debentures/notes	42,995	83,140
Level 3
Financial assets:
Investment securities	775	759
Impaired loans carried at fair value	16,963	33,819
Mortgage IRLCs	0	0
Other loans	4,757,461	4,531,680
Loans receivable, net	4,774,424	4,565,499
Financial liabilities:
Total deposits	0	0
Level 3 | Fair value swap
Derivative financial instruments:
Swaps, fair value	226	135
Available-for-sale Securities [Member]
Financial assets:
Accrued interest receivable	4,048	4,840
Available-for-sale Securities [Member] | Carrying value
Financial assets:
Accrued interest receivable	4,048	4,840
Available-for-sale Securities [Member] | Level 2
Financial assets:
Accrued interest receivable	4,048	4,840
Loans
Financial assets:
Accrued interest receivable	13,629	13,495
Loans | Carrying value
Financial assets:
Accrued interest receivable	13,629	13,495
Loans | Level 3
Financial assets:
Accrued interest receivable	13,629	13,495
Deposits
Financial liabilities:
Accrued interest payable	1,125	1,366
Deposits | Carrying value
Financial liabilities:
Accrued interest payable	1,125	1,366
Deposits | Level 1
Financial liabilities:
Accrued interest payable	14	16
Deposits | Level 2
Financial liabilities:
Accrued interest payable	1,111	1,350
Borrowings
Financial liabilities:
Accrued interest payable	1,426	1,535
Borrowings | Carrying value
Financial liabilities:
Accrued interest payable	1,426	1,535
Borrowings | Level 1
Financial liabilities:
Accrued interest payable	3	4
Borrowings | Level 2
Financial liabilities:
Accrued interest payable	$1,423	$1,531

Fair_Values_Schedule_of_Impair

Fair Values Schedule of Impaired Financing Receivables (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Book Value Of Impaired Loans Carried At Fair Value	$19,643	$41,002
Partial Charge-Offs On Impaired Loans carried at Fair Value	19,731	48,952
Impaired Financing Receivable, Related Allowance	3,660	10,451
Impaired loans carried at fair value	16,963	33,819
Impaired Financing Receivable, loans not held at Fair Value, Recorded Investment	54,069	71,313
Partial Charge-offs on Impaired Loans carried at Cost	12,749	14,320
impaired Financing Receivable, loans not held at Fair Value, Carrying Amount	53,089	68,045
Recorded investment	73,712	112,315	137,339
Partial charge-offs on impaired loans	32,480	63,272
Individually evaluated for impairment	3,660	10,451
Impaired Financing Receivable, Carrying Value	70,052	101,864
Financing Receivable, not collateral dependent [Domain]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	980	3,268
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	$2,680	$7,183

Capital_Ratios_Capital_Ratios_

Capital Ratios - Capital Ratios for Park and Each Subsidiary (Details)	Dec. 31, 2014	Dec. 31, 2013
Park National Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Risk-Based Capital	10.13%	10.01%
Total Risk-Based	11.74%	11.78%
Leverage	6.96%	7.10%
Park
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Risk-Based Capital	13.39%	13.27%
Total Risk-Based	15.14%	15.91%
Leverage	9.25%	9.48%

Capital_Ratios_Various_Measure

Capital Ratios - Various Measures of Capital for Park and Each of PNB and VB (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Risk-Based Capital (to risk-weighted assets), To Be Adequately Capitalized, Ratio	8.00%
Tier 1 Risk-Based Capital (to risk-weighted assets)
Tier 1 Risk-Based Capital (to risk-weighted assets), To Be Adequately Capitalized, Ratio	4.00%
Leverage Ratio (to average total assets)
Leverage Ratio (to risk-weighted assets), To Be Adequately Capitalized, Ratio	4.00%
Park National Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Risk-Based Capital (to risk-weighted assets), Actual Amount	$563,188	$545,144
Total Risk-Based Capital (to risk-weighted assets), Ratio	11.74%	11.78%
Total Risk-Based Capital (to risk-weighted assets), To Be Adequately Capitalized, Amount	383,634	370,198
Total Risk-Based Capital (to risk-weighted assets), To Be Adequately Capitalized, Ratio	8.00%	8.00%
Total Risk-Based Capital (to risk-weighted assets), To Be Well Capitalized, Amount	479,542	462,747
Total Risk-Based Capital (to risk-weighted assets), To Be Well Capitalized, Ratio	10.00%	10.00%
Tier 1 Risk-Based Capital (to risk-weighted assets)
Tier 1 Risk-Based Capital (to risk-weighted assets), Actual Amount	485,943	463,015
Tier 1 Risk-Based Capital (to risk-weighted assets), Ratio	10.13%	10.01%
Tier 1 Risk-Based Capital (to risk-weighted assets), To Be Adequately Capitalized, Amount	191,817	185,099
Tier 1 Risk-Based Capital (to risk-weighted assets), To Be Adequately Capitalized, Ratio	4.00%	4.00%
Tier 1 Risk-Based Capital (to risk-weighted assets), To Be Well Capitalized, Amount	287,725	277,648
Tier 1 Risk-Based Capital (to risk-weighted assets), To Be Well Capitalized, Ratio	6.00%	6.00%
Leverage Ratio (to average total assets)
Leverage Ratio (to risk-weighted assets), Actual Amount	485,943	463,015
Leverage Ratio (to risk-weighted assets), Ratio	6.96%	7.10%
Leverage Ratio (to risk-weighted assets), To Be Adequately Capitalized, Amount	279,210	261,025
Leverage Ratio (to risk-weighted assets), To Be Adequately Capitalized, Ratio	4.00%	4.00%
Leverage Ratio (to risk-weighted assets), To Be Well Capitalized, Amount	349,013	326,281
Leverage Ratio (to risk-weighted assets), To Be Well Capitalized, Ratio	5.00%	5.00%
Park
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Risk-Based Capital (to risk-weighted assets), Actual Amount	739,517	754,605
Total Risk-Based Capital (to risk-weighted assets), Ratio	15.14%	15.91%
Total Risk-Based Capital (to risk-weighted assets), To Be Adequately Capitalized, Amount	390,822	379,446
Total Risk-Based Capital (to risk-weighted assets), To Be Adequately Capitalized, Ratio	8.00%	8.00%
Tier 1 Risk-Based Capital (to risk-weighted assets)
Tier 1 Risk-Based Capital (to risk-weighted assets), Actual Amount	654,339	629,410
Tier 1 Risk-Based Capital (to risk-weighted assets), Ratio	13.39%	13.27%
Tier 1 Risk-Based Capital (to risk-weighted assets), To Be Adequately Capitalized, Amount	195,411	189,723
Tier 1 Risk-Based Capital (to risk-weighted assets), To Be Adequately Capitalized, Ratio	4.00%	4.00%
Leverage Ratio (to average total assets)
Leverage Ratio (to risk-weighted assets), Actual Amount	654,339	629,410
Leverage Ratio (to risk-weighted assets), Ratio	9.25%	9.48%
Leverage Ratio (to risk-weighted assets), To Be Adequately Capitalized, Amount	$282,992	$265,633
Leverage Ratio (to risk-weighted assets), To Be Adequately Capitalized, Ratio	4.00%	4.00%

Segment_Information_Schedule_o

Segment Information - Schedule of Operating Results by Segment (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Other Noninterest Expense	$187,991	$181,214	$181,014
Net interest income (loss)	225,044	221,025	235,315
Depreciation, Amortization and Accretion, Net	7,243	7,315	6,954
(Recovery of) provision for loan losses	-7,333	3,415	35,419
Other income	75,549	73,277	92,403
Gain (Loss) on Sale of Investments	-1,158	0	0
Other expense	195,234	188,529	187,968
Income (loss) before taxes	112,692	102,358	104,331
Income taxes (benefit)	28,602	25,131	25,701
Net income	84,090	77,227	78,630
Assets	7,003,256	6,638,347	6,642,803
Loans	4,829,682	4,620,505	4,450,322
Deposits	5,128,000	4,789,994	4,716,032
Totals For Reportable Segments [Member]
Segment Reporting Information [Line Items]
Other Noninterest Expense	179,991	173,694	174,429
Net interest income (loss)	227,056	218,197	230,573
Depreciation, Amortization and Accretion, Net	7,243	7,315	6,954
Income taxes (benefit)	33,389	27,957	27,506
Assets	6,996,513	6,643,994	6,656,933
Deposits	5,228,649	4,903,564	4,822,465
PNB
Segment Reporting Information [Line Items]
Net interest income (loss)	218,641	210,781	221,758
(Recovery of) provision for loan losses	3,517	14,039	16,678
Other income	69,384	70,841	70,739
Other expense	171,365	165,665	156,516
Income (loss) before taxes	113,143	101,918	119,303
Income taxes (benefit)	30,103	26,324	32,197
Net income	83,040	75,594	87,106
Assets	6,912,443	6,524,098	6,502,579
Loans	4,781,761	4,559,406	4,369,173
Deposits	5,222,766	4,896,405	4,814,107
GFSC
Segment Reporting Information [Line Items]
Net interest income (loss)	7,457	8,741	9,156
(Recovery of) provision for loan losses	1,544	1,175	859
Other income	-1	11	0
Other expense	4,103	3,133	2,835
Income (loss) before taxes	1,809	4,444	5,462
Income taxes (benefit)	634	1,556	1,912
Net income	1,175	2,888	3,550
Assets	40,308	47,115	49,926
Loans	40,645	47,228	50,082
Deposits	5,883	7,159	8,358
SEPH
Segment Reporting Information [Line Items]
Net interest income (loss)	958	-1,325	-341
(Recovery of) provision for loan losses	-12,394	-11,799	17,882
Other income	5,991	1,956	21,431
Other expense	11,766	12,211	22,032
Income (loss) before taxes	7,577	219	-18,824
Income taxes (benefit)	2,652	77	-6,603
Net income	4,925	142	-12,221
Assets	43,762	72,781	104,428
Loans	23,956	38,014	59,178
Deposits	0	0	0
All Other
Segment Reporting Information [Line Items]
Net interest income (loss)	-2,012	2,828	4,742
(Recovery of) provision for loan losses	0	0	0
Other income	175	469	233
Other expense	8,000	7,520	6,585
Income (loss) before taxes	-9,837	-4,223	-1,610
Income taxes (benefit)	-4,787	-2,826	-1,805
Net income	-5,050	-1,397	195
Assets	6,743	-5,647	-14,130
Loans	-16,680	-24,143	-28,111
Deposits	-100,649	-113,570	-106,433
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Other Noninterest Expense	0	0	0
Net interest income (loss)	3,708	8,659	8,558
Depreciation, Amortization and Accretion, Net	0	0	0
Income taxes (benefit)	0	0	0
Assets	-18,556	-30,369	-35,639
Deposits	-100,649	-113,570	-106,433
Parent Co Gfsc Totals Not Eliminated [Member]
Segment Reporting Information [Line Items]
Other Noninterest Expense	8,000	7,520	6,585
Net interest income (loss)	-5,720	-5,831	-3,816
Depreciation, Amortization and Accretion, Net	0	0	0
Income taxes (benefit)	-4,787	-2,826	-1,805
Assets	25,299	24,722	21,509
Deposits	$0	$0	$0

Parent_Company_Statements_Narr

Parent Company Statements - Narrative (Details) (Parent Company, USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Parent Company
Income taxes	$5.81	$2.54	$4.54
Undistributed earnings, restricted from transfer as dividends	$197.90	$196

Parent_Company_Statements_Bala

Parent Company Statements - Balance Sheets (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Assets:
Other assets	$489,439	$506,046
Total assets	7,003,256	6,638,347	6,642,803
Liabilities:
Subordinated notes	45,000	80,250
Other liabilities	68,076	63,786
Total liabilities	6,304,658	5,986,600
Total liabilities and shareholders’ equity	7,003,256	6,638,347
Parent Company
Assets:
Cash	98,671	106,942	98,726	134,650
Investment in subsidiaries	601,912	582,992
Debentures receivable from PNB	25,000	25,000
Other investments	2,344	2,297
Other assets	23,260	21,984
Total assets	751,187	739,215
Liabilities:
Subordinated notes	45,000	80,250
Other liabilities	7,589	7,218
Total liabilities	52,589	87,468
Total shareholders’ equity	698,598	651,747
Total liabilities and shareholders’ equity	$751,187	$739,215

Parent_Company_Statements_Stat

Parent Company Statements - Statements of Income (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income:
Interest and dividends	$265,143	$262,947	$285,735
Expense:
Federal income tax benefit	-28,602	-25,131	-25,701
Net income	84,090	77,227	78,630
Other Comprehensive Income (Loss), Net of Tax	21,811	-17,901	-8,687
Parent Company
Income:
Dividends from subsidiaries	60,000	15,000	197,000
Interest and dividends	3,708	8,659	10,027
Other	262	531	232
Total income	63,970	24,190	207,259
Expense:
Other, net	13,807	13,413	11,869
Total expense	13,807	13,413	11,869
Income before federal taxes and equity in undistributed income (losses) of subsidiaries	50,163	10,777	195,390
Federal income tax benefit	4,787	2,826	1,806
Income before equity in undistributed income (losses) of subsidiaries	54,950	13,603	197,196
Equity in undistributed income (losses) of subsidiaries	29,140	63,624	-118,566
Net income	84,090	77,227	78,630
Other Comprehensive Income (Loss), Net of Tax	21,811	-17,901	-8,687
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$105,901	$59,326	$69,943

Parent_Company_Statements_Stat1

Parent Company Statements - Statements of Cash Flows (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Net income	$84,090	$77,227	$78,630
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based Compensation	1,259	850	407
Increase (decrease) in other liabilities	13,629	1,676	954
Net cash provided by operating activities	122,728	145,761	138,799
Investing activities:
Net cash used in investing activities	-280,565	-137,115	-228,346
Financing activities
Payment to repurchase warrants	0	0	-2,843
Repayment of subordinated notes	-35,250	0	-25,000
Treasury Stock, Value, Acquired, Cost Method	-2,355	-843	0
Proceeds from issuance of subordinated notes	0	0	30,000
Net cash provided by (used in) financing activities	248,506	-62,921	133,366
Increase (decrease) in cash and cash equivalents	90,669	-54,275	43,819
Parent Company
Net income	84,090	77,227	78,630
Adjustments to reconcile net income to net cash provided by operating activities:
Undistributed (income) losses of subsidiaries	-29,140	-63,624	118,566
(Decrease) increase in other assets	-1,292	-2,215	5,748
Increase (decrease) in other liabilities	298	-2,187	1,724
Net cash provided by operating activities	55,215	10,051	205,075
Investing activities:
Capital contribution in subsidiary	0	-45,000	-45,000
Purchase of debentures receivable from subsidiaries	0	0	-115,000
Repayment of investments in and advances to subsidiaries	32,000	101,960	52,000
Net cash used in investing activities	32,000	56,960	-108,000
Financing activities
Cash dividends paid	-57,876	-57,949	-60,154
Payment to repurchase warrants	0	0	-2,843
Payment to repurchase preferred shares	0	0	-100,000
Proceeds from issuance of subordinated notes	0	0	30,000
Cash payment for fractional shares	-5	-3	-2
Net cash provided by (used in) financing activities	-95,486	-58,795	-132,999
Increase (decrease) in cash and cash equivalents	-8,271	8,216	-35,924
Cash at beginning of year	106,942	98,726	134,650
Cash at end of year	98,671	106,942	98,726
Parent Company
Adjustments to reconcile net income to net cash provided by operating activities:
Compensation expense for issuance of treasury shares to directors	801	850	407
Share-based Compensation	458	0	0
Financing activities
Repayment of subordinated notes			$0

Participation_In_The_US_Treasu1

Participation In The U.S. Treasury Capital Purchase Program (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 23, 2008	2-May-12
Participation In The U.S. Treasury Capital Repurchase Program [Line Items]
Preferred stock value		$0	$0
Liquidation preference per senior preferred shares		$0	$0
Dividends, preferred stock, cash	1,571,000
Series A preferred stock
Participation In The U.S. Treasury Capital Repurchase Program [Line Items]
Preferred stock value				100,000,000
Liquidation preference per senior preferred shares				$1,000
Stock repurchased during period, shares	100,000
Stock repurchased during period, value	100,000,000
Payments for repurchase of preferred stock and preference stock including unpaid dividends	101,000,000
Dividends, preferred stock, cash	1,000,000
Charge to retained earnings from preferred stock repurchase	1,600,000
U.S. Treasury Capital Purchase Program
Participation In The U.S. Treasury Capital Repurchase Program [Line Items]
Number of securities repurchasable					227,376
Number of warrants repurchased					227,376
Payments for repurchase of warrants					$2,800,000
Repurchase price per share					$12.50