Park National (PRK) 10-K 21 Feb 17 2016 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Feb. 17, 2017	Jun. 30, 2016
Entity Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	FY
Entity Registrant Name	PARK NATIONAL CORP /OH/
Entity Central Index Key	805,676
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Common Stock, Shares Outstanding		15,290,709
Entity Public Float			$ 1,379,303,140

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets:
Cash and due from banks	$ 122,811	$ 119,412
Money market instruments	23,635	30,047
Cash and cash equivalents	146,446	149,459
Investment securities:
Securities available-for-sale, at fair value (amortized cost of $1,262,761 and $1,436,714 at December 31, 2016 and 2015, respectively)	1,258,139	1,436,266
Securities held-to-maturity, at amortized cost (fair value of $256,672 and $151,428 at December 31, 2016 and 2015, respectively)	259,833	149,302
Other investment securities	61,811	58,311
Total investment securities	1,579,783	1,643,879
Total loans	5,271,857	5,068,085
Allowance for loan losses	(50,624)	(56,494)
Net loans	5,221,233	5,011,591
Other assets:
Bank owned life insurance	185,234	181,684
Prepaid assets	88,874	80,635
Goodwill	72,334	72,334
Premises and equipment, net	57,971	59,493
Affordable housing tax credit investments	52,947	51,247
Accrued interest receivable	18,822	18,675
Other real estate owned	13,926	18,651
Mortgage loan servicing rights	9,266	9,008
Other	20,750	14,698
Total other assets	520,124	506,425
Total assets	7,467,586	7,311,354
Deposits:
Non-interest bearing	1,523,417	1,404,032
Interest bearing	3,998,539	3,943,610
Total deposits	5,521,956	5,347,642
Short-term borrowings	394,795	394,242
Long-term debt	694,281	738,105
Subordinated notes	45,000	45,000
Total borrowings	1,134,076	1,177,347
Other liabilities:
Accrued interest payable	2,151	2,338
Unfunded commitments in affordable housing tax credit investments	14,282	20,311
Other	52,881	50,361
Total other liabilities	69,314	73,010
Total liabilities	6,725,346	6,597,999
Commitments and Contingencies
Shareholders’ equity:
Preferred Stock, Value, Issued	0	0
Common shares, no par value (20,000,000 shares authorized; 16,150,807 and 16,150,854 shares issued at December 31, 2016 and 2015, respectively)	305,826	303,966
Accumulated other comprehensive loss, net	(17,745)	(15,643)
Retained earnings	535,631	507,505
Less: Treasury shares (810,089 and 820,039 shares at December 31, 2016 and 2015, respectively)	(81,472)	(82,473)
Total shareholders’ equity	742,240	713,355
Total liabilities and shareholders’ equity	$ 7,467,586	$ 7,311,354

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Amortized cost of securities available-for-sale	$ 1,262,761	$ 1,436,714
Fair value of securities held-to-maturity	$ 256,672	$ 151,428
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	16,150,807	16,150,854
Treasury stock, shares	810,089	820,039

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest and dividend income:
Interest and fees on loans	$ 241,979	$ 227,979	$ 227,644
Interest and dividends on:
Obligations of U.S. Government, its agencies and other securities	30,627	36,025	36,981
Obligations of states and political subdivisions	2,632	182	3
Other interest income	1,020	888	515
Total interest and dividend income	276,258	265,074	265,143
Interest on deposits:
Demand and savings deposits	4,079	2,229	1,677
Time deposits	9,337	10,125	9,323
Interest on short-term borrowings	456	469	517
Interest on long-term debt	24,300	24,619	28,582
Total interest expense	38,172	37,442	40,099
Net interest income	238,086	227,632	225,044
(Recovery of) provision for loan losses	(5,101)	4,990	(7,333)
Net interest income after (recovery of) provision for loan losses	243,187	222,642	232,377
Other income:
Income from fiduciary activities	21,400	20,195	19,150
Service charges on deposit accounts	14,259	14,751	15,423
Net gain on sales of securities	0	88	(1,158)
Other service income	14,419	11,438	10,459
Checkcard fee income	15,057	14,561	13,570
Bank owned life insurance income	4,338	5,783	4,861
ATM fees	2,268	2,428	2,467
Gain on sale of OREO, net	1,323	1,604	5,503
OREO valuation adjustments	(601)	(1,592)	(2,406)
Gain (Loss) on Sales of Loans, Net	0	756	1,867
Miscellaneous	6,268	7,539	5,813
Total other income	78,731	77,551	75,549
Other expense:
Salaries	87,034	86,189	81,977
Employee Benefit Expense	19,262	21,296	19,991
Data processing fees	5,608	5,037	4,712
Professional fees and services	27,181	23,452	29,580
Occupancy expense	10,239	9,686	10,006
Furniture and equipment expense	13,766	11,806	11,571
Insurance	5,825	5,629	5,723
Marketing	4,523	3,983	4,371
Communication	4,985	5,130	5,268
State tax expense	3,560	3,566	2,290
OREO expense	1,021	1,446	2,063
Prepayment penalty on long-term debt	5,554	532	0
Miscellaneous	10,465	8,862	9,958
Total other expense	199,023	186,614	187,510
Income (loss) before taxes	122,895	113,579	120,416
Federal income taxes	36,760	32,567	36,459
Net income	$ 86,135	$ 81,012	$ 83,957
Earnings per common share:
Basic (in dollars per share)	$ 5.62	$ 5.27	$ 5.45
Diluted (in dollars per share)	$ 5.59	$ 5.26	$ 5.45

Statements of Comprehensive Inc

Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income	$ 86,135	$ 81,012	$ 83,957
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax	(502)	(424)	(12)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	(109)	910	9,279
Other comprehensive income (loss), net of income tax:
Changes in pension plan assets and benefit obligations recognized in other comprehensive income	611	(486)	(9,267)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	0	0	753
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax	(2,713)	(1,549)	30,325
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(2,713)	(1,549)	31,078
Other Comprehensive Income (Loss), Net of Tax	(2,102)	(2,035)	21,811
Comprehensive income	$ 84,033	$ 78,977	$ 105,768

Statements of Comprehensive In6

Statements of Comprehensive Income (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax	$ 502,000	$ 424,000	$ 12,000
Tax Effect
Amortization of net loss and prior service costs, tax expense	271	228	7
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax	59	(490)	(4,997)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	0	0	405
Unrealized net holding gain (loss) on securities available-for-sale, tax expense	(1,461)	(834)	16,329
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	$ 109,000	$ (910,000)	$ (9,279,000)

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Shares	Common Shares	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive (Loss) Income
Beginning balance at Dec. 31, 2013		$ 0	$ 302,651	$ 458,719	$ (76,128)	$ (35,419)
Beginning balance, shares at Dec. 31, 2013		0	15,411,952
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 83,957			83,957
Other comprehensive income (loss), net of income tax:
Other Comprehensive Income (Loss), Net of Tax	$ 21,811					21,811
Cash dividends				(57,949)
Fractional shares issued in dividend reinvestment plan, shares			(53)
Cash payment for fractional shares in dividend reinvestment plan			$ (5)
Allocated Share-based Compensation Expense			$ 458
Treasury Stock, Shares, Acquired			(29,700)
Treasury Stock, Value, Acquired, Cost Method					2,355
Treasury Stock Reissued Shares For Director Grants	10,200		10,200
Treasury shares reissued for director grants				(243)	1,044
Ending balance at Dec. 31, 2014		$ 0	$ 303,104	484,484	(77,439)	(13,608)
Ending balance, shares at Dec. 31, 2014		0	15,392,399
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 81,012			81,012
Other comprehensive income (loss), net of income tax:
Other Comprehensive Income (Loss), Net of Tax	$ (2,035)					(2,035)
Cash dividends				(57,930)
Fractional shares issued in dividend reinvestment plan, shares			(34)
Cash payment for fractional shares in dividend reinvestment plan			$ (3)
Allocated Share-based Compensation Expense			$ 865
Treasury Stock, Shares, Acquired			(71,700)
Treasury Stock, Value, Acquired, Cost Method					(6,058)
Treasury Stock Reissued Shares For Director Grants	10,150		10,150
Treasury shares reissued for director grants				(61)	1,024
Ending balance at Dec. 31, 2015	$ 713,355	$ 0	$ 303,966	507,505	(82,473)	(15,643)
Ending balance, shares at Dec. 31, 2015		0	15,330,815
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	86,135			86,135
Other comprehensive income (loss), net of income tax:
Other Comprehensive Income (Loss), Net of Tax	$ (2,102)					(2,102)
Cash dividends				(57,958)
Fractional shares issued in dividend reinvestment plan, shares			(47)
Cash payment for fractional shares in dividend reinvestment plan			$ (4)
Allocated Share-based Compensation Expense			$ 1,864
Treasury Stock, Shares, Acquired			0
Treasury Stock Reissued Shares For Director Grants	9,950		9,950
Treasury shares reissued for director grants				(51)	1,001
Ending balance at Dec. 31, 2016	$ 742,240	$ 0	$ 305,826	$ 535,631	$ (81,472)	$ (17,745)
Ending balance, shares at Dec. 31, 2016		0	15,340,718

Consolidated Statements of Cha8

Consolidated Statements of Changes In Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash dividends on common stock per share	$ 3.76	$ 3.76	$ 3.76

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest Paid	$ 38,359	$ 37,655	$ 40,449
Operating activities:
Net income	86,135	81,012	83,957
Adjustments to reconcile net income to net cash provided by operating activities:
(Recovery of) provision for loan losses	(5,101)	4,990	(7,333)
Amortization of loan fees and costs, net	7,332	6,440	4,160
Provision for depreciation	8,396	7,347	7,243
Amortization (accretion) of investment securities, net	247	(226)	(213)
Amortization of prepayment penalty on long term debt	6,176	6,047	5,031
Prepayment penalty on long-term debt	5,554	532	0
Deferred income tax	581	(250)	2,528
Realized net investment security (gains) losses	0	0	1,158
Loan originations to be sold in secondary market	(287,722)	(220,800)	(136,125)
Proceeds from sale of loans in secondary market	290,132	222,785	135,209
Gain on sale of loans in secondary market	0	(756)	(1,867)
Proceeds from Sale of Other Loans Held-for-sale	0	900	20,966
Share-based Compensation	2,814	1,828	1,259
OREO valuation adjustments	601	1,592	2,406
Gains (Losses) on Sales of Other Real Estate	(1,323)	(1,604)	(5,503)
Proceeds from Sale of Other Real Estate	8,704	17,058	27,798
Bank owned life insurance income	(4,338)	(5,783)	(4,861)
Changes in assets and liabilities:
Increase in other assets	(18,086)	(10,978)	(18,313)
Increase in other liabilities	2,006	1,173	5,689
Net cash provided by operating activities	87,887	89,234	71,743
Proceeds from Life Insurance Policies	1,050	6,340	2,221
Investing activities:
Proceeds from Sale of Federal Home Loan Bank Stock	0	0	8,946
Proceeds from sales of securities	0	3,144	173,123
Proceeds from calls and maturities of securities:
Held-to-maturity	29,901	36,393	41,436
Available-for-sale	753,325	321,146	99,092
Purchase of securities:
Held-to-maturity	(141,045)	(48,226)	0
Available-for-sale	(579,006)	(457,617)	(350,934)
Payments to Acquire Other Investments	(3,500)	0	(1,350)
Net loan originations, portfolio loans	199,494	247,882	234,017
Payments for Affordable Housing Programs	(15,029)	(5,318)	(9,417)
Payments to Acquire Life Insurance Policies	0	10,045	0
Purchases of premises and equipment, net	(7,466)	(11,361)	(7,444)
Net cash used in investing activities	(152,560)	(395,468)	(229,580)
Financing activities
Net increase in deposits	174,314	219,642	338,006
Net increase in short-term borrowings	553	117,262	34,951
Proceeds from issuance of long-term debt	0	25,000	125,000
Repayment of subordinated notes	0	0	(35,250)
Repayment of long-term debt	(55,554)	(80,076)	(153,970)
Cash dividends paid	(57,653)	(57,776)	(57,876)
Net cash provided by financing activities	61,660	217,994	248,506
(Decrease) increase in cash and cash equivalents	(3,013)	(88,240)	90,669
Cash and cash equivalents at beginning of year	149,459	237,699	147,030
Cash and cash equivalents at end of year	146,446	149,459	237,699
Income Taxes Paid	27,260	26,140	27,810
Non cash activities [Abstract]
Real Estate Owned, Transfer to Real Estate Owned	3,339	13,447	12,780
Transfer of Portfolio Loans and Leases to Held-for-sale	0	144	21,985
Affordable Housing Program Obligation, Period Increase (Decrease)	9,000	9,000	8,000
Mortgage Loans on Real Estate [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Gain (Loss) on Sale of Loans and Leases	5,517	4,027	2,682
Held-to-maturity Securities [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Realized net investment security (gains) losses		(88)
Treasury Stock, Common [Member]
Financing activities
Treasury Stock, Value, Acquired, Cost Method	$ 0	$ (6,058)	$ (2,355)

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2016
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. Reclassifications Certain prior year amounts have been reclassified to conform with the current year presentation. These reclassifications had no impact on 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 $51.6 million at December 31, 2016 and $44.2 million at December 31, 2015 . No other compensating balance arrangements were in existence at December 31, 2016 . 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 4 - Investment Securities). HTM securities are those securities that the Corporation has the positive intent and ability to hold to maturity and are recorded at amortized cost. AFS securities are those securities that would be available to be sold in the future in response to the Corporation’s liquidity needs, changes in market interest rates, and asset-liability management strategies, among other reasons. AFS securities are reported at fair value, with unrealized holding gains and losses excluded from earnings but included in other comprehensive income (loss), net of applicable income taxes. The Corporation did not hold any trading securities during any period presented. AFS and HTM securities are evaluated quarterly for potential other-than-temporary impairment. Management considers the facts related to each security including the nature of the security, the amount and duration of the loss, the credit quality of the issuer, the expectations for that security’s performance and whether Park intends to sell, or it is more likely than not that Park will be required to sell, a security in an unrealized loss position before recovery of its amortized cost basis. Declines in the value of equity securities that are considered to be other-than-temporary are recorded as a charge to earnings in the Consolidated Statements of Income. Declines in the value of debt securities that are considered to be other-than-temporary are separated into (1) the amount of the total impairment related to credit loss and (2) the amount of the total impairment related to all other factors. The amount of the total other-than-temporary impairment related to the credit loss is recognized in earnings. The amount of the total other-than-temporary impairment related to all other factors is recognized in other comprehensive income (loss), net of income tax. Interest income from investment securities includes amortization of purchase premium or discount. Premiums and discounts on securities are amortized on the level-yield method without anticipating prepayments, except for mortgage-backed securities where prepayments are anticipated. Gains and losses realized on the sale of investment securities are recorded on the trade date and determined using the specific identification basis. Federal Home Loan Bank ("FHLB") and Federal Reserve Bank ("FRB") Stock Park’s national bank subsidiary, The Park National Bank ("PNB"), is a member of the FHLB. Additionally, PNB is a member of the FRB. Members are required to own a certain amount of stock based on their level of borrowings and other factors and may invest in additional amounts. FHLB stock and FRB stock are classified as restricted securities and are carried at their redemption value within other investment securities on the Consolidated Balance Sheets. Impairment is evaluated based on the ultimate recovery of par value. Both cash and stock dividends are reported as income. Bank Owned Life Insurance Park has purchased insurance policies on the lives of directors and certain key officers. Bank owned life insurance is recorded at its cash surrender value (or the amount that can be realized). Loans Held for Sale Generally, loans held for sale are carried at the lower of cost or fair value. Park has elected the fair value option for mortgage loans held for sale, which are carried at their fair value as of each balance sheet date. 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 accrued on the unpaid principal balance. Net deferred loan origination fees and costs are deferred and recognized in interest income using the level-yield method without anticipating prepayments. 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 ("HELOCs"), and installment loans included in the residential real estate segment; and (3) all loans included in the consumer segment. Generally, commercial loans are placed on nonaccrual status at 90 days past due and consumer and residential mortgage loans are placed on nonaccrual status at 120 days past due. Commercial loans placed on nonaccrual status are considered impaired (see Note 5 - Loans). For loans which are on nonaccrual status, it is Park’s policy to reverse interest previously accrued on the loans against interest income. Interest on such loans may be recorded on a cash basis and be included in earnings only when Park expects to receive the entire recorded investment of the loan. Park’s charge-off policy for commercial loans requires management to establish a specific reserve or record a charge-off as soon as it is apparent that the borrower is troubled and there is, or likely will be, a collateral shortfall related to the estimated value of the collateral securing the loan. The Company’s charge-off policy for consumer loans is dependent on the class of the loan. Residential mortgage loans, HELOCs, and consumer loans secured by residential real estate are typically charged down to the value of the collateral, less estimated selling costs, at 180 days past due. The charge-off policy for other consumer loans, primarily installment loans, requires a monthly review of delinquent loans and a complete charge-off for any account that reaches 120 days past due. The delinquency status of a loan is based on contractual terms and not on how recently payments have been received. Loans may be removed from nonaccrual status when loan payments have been received to cure the delinquency status, the borrower has demonstrated the ability to maintain current payment status in accordance with the loan agreement and the loan is deemed to be well-secured by management. A description of each segment of the loan portfolio, along with the risk characteristics of each segment, is included below: Commercial, financial and agricultural: Commercial, financial and agricultural loans are made for a wide variety of general corporate purposes, including financing for commercial and industrial businesses, financing for equipment, inventories and accounts receivable, acquisition financing and commercial leasing. The term of each commercial loan varies by its purpose. Repayment terms are structured such that commercial loans will be repaid within the economic useful life of the underlying asset. The commercial loan portfolio includes loans to a wide variety of corporations and businesses across many industrial classifications originated in the 28 Ohio counties where PNB operates. The primary industries represented by these customers include manufacturing, retail trade, health care and other services. Commercial real estate: Commercial real estate (“CRE”) loans include mortgage loans to developers and owners of commercial real estate. The lending policy for CRE loans is designed to address the unique risk attributes of CRE lending. The collateral for these CRE loans is the underlying commercial real estate. Construction real estate : The Company defines construction loans as both commercial construction loans and residential construction loans where the loan proceeds are used exclusively for the improvement of real estate as to which the Company holds a mortgage. Construction loans may be in the form of a permanent loan or short-term construction loan, depending on the needs of the individual borrower. Construction financing is generally considered to involve a higher degree of risk of loss than long-term financing on improved, occupied real estate. Risk of loss on a construction loan depends largely upon the accuracy of the initial estimate of the property’s value at completion of construction and the estimated cost (including interest) of construction. If the estimate of construction cost proves to be inaccurate, the PNB division making the loan may be required to advance funds beyond the amount originally committed to permit completion of the project. If the estimate of value proves inaccurate, the PNB division may be confronted, at or prior to the maturity of the loan, with a project having a value insufficient to assure full repayment, should the borrower default. In the event that a default on a construction loan occurs and foreclosure follows, the PNB division must take control of the project and attempt to either arrange for completion of construction or dispose of the unfinished project. Additional risk exists with respect to loans made to developers who do not have a buyer for the property, as the developer may lack funds to pay the loan if the property is not sold upon completion. PNB and its divisions attempt to reduce such risks on loans to developers by requiring personal guarantees and reviewing current personal financial statements and tax returns as well as other projects undertaken by the developer. Residential real estate: The Company defines residential real estate loans as first mortgages on individuals’ primary residences or second mortgages of individuals’ primary residences in the form of HELOCs or installment loans. Credit approval for residential real estate loans requires demonstration of sufficient income to repay the principal and interest and the real estate taxes and insurance, stability of employment, an established credit record and an appraised value of the real estate securing the loan. Consumer: The Company originates direct and indirect consumer loans, primarily automobile loans, 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 ("ALLL") 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”). Included in the statistical allocation is a reserve for troubled debt restructurings ("TDRs") within the consumer loan portfolio. Management performs a periodic evaluation to ensure the reserve calculated utilizing the statistical allocation is consistent with a reserve calculated under Accounting Standards Codification ("ASC") 310-10 - Receivables . In calculating the allowance for loan losses, management believes it is appropriate to consider 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, 2016 , 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 2010 through 2016 within the individual segments of the commercial and consumer loan categories. Management believes the 84 -month historical loss experience methodology is appropriate in the current economic environment, as it captures loss rates consistent with current expectations based on current economic conditions. The loss factor applied to Park’s consumer loan portfolio as of December 31, 2016 was based on the historical loss experience over the past 84 months, plus an additional judgmental reserve, increasing the total allowance for loan loss coverage in the consumer loan portfolio to approximately 1.95 years of historical losses. The consumer loan portfolio loss coverage ratio was 1.99 years at December 31, 2015 . Historical loss experience over the past 84 months for the consumer loan portfolio was 0.34% for 2016 and 0.42% for 2015. The loss factor applied to Park’s commercial loan portfolio as of December 31, 2016 was based on the historical loss experience over the past 84 months, plus additional reserves for consideration of (1) a loss emergence period factor, (2) a loss migration factor and (3) a judgmental or environmental loss factor. These additional reserves increased the total allowance for loan loss coverage in the commercial loan portfolio to approximately 3.20 years of historical losses at December 31, 2016. The commercial loan portfolio loss coverage ratio was 2.37 years at December 31, 2015 . Historical loss experience over the past 84 months for the commercial loan portfolio was 0.39% for 2016 and 0.53% for 2015. Park’s commercial loans are individually risk graded. If loan downgrades occur, the probability of default increases and accordingly management allocates a higher percentage reserve to those accruing commercial loans graded special mention and substandard. The judgmental increases discussed above incorporate management’s evaluation of the impact of environmental qualitative factors which pose additional risks and assign a component of the allowance for loan losses in consideration of these factors. Such environmental factors include: national and local economic trends and conditions; experience, ability and depth of lending management and staff; effects of any changes in lending policies and procedures; and levels of, and trends in, consumer bankruptcies, delinquencies, impaired loans and charge-offs and recoveries. GAAP requires a specific allocation to be established as a component of the allowance for loan losses for certain loans when it is probable that all amounts due pursuant to the contractual terms of the loans will not be collected, and the recorded investment in the loans exceeds their measure of impairment. Management considers the following related to commercial loans when determining if a loan should be considered impaired : (1) current debt service coverage levels of the borrowing entity; (2) payment history over the most recent 12-month period; (3) other signs of deterioration in the borrower’s financial situation, such as changes in credit scores; and (4) consideration of global cash flows of financially sound guarantors that have previously supported loan payments. The recorded investment is the carrying balance of the loan, plus accrued interest receivable, both as of the end of the year. Impairment is measured using either the present value of expected future cash flows based upon the initial effective interest rate on the loan, or the fair value of the collateral. If a loan is considered to be collateral dependent, the fair value of collateral, less estimated selling costs, is used to measure impairment. Troubled Debt Restructuring Management classifies loans as TDRs when a borrower is experiencing financial difficulty and Park has granted a concession. In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed of the probability that the borrower will be in payment default on any of the borrower's debt in the foreseeable future without the modification. This evaluation is performed under the Company’s internal underwriting policy. Management’s policy is to modify loans by extending the term or by granting a temporary or permanent contractual interest rate below the market rate, not by forgiving debt. A court's discharge of a borrower's debt in a Chapter 7 bankruptcy is considered a concession when the borrower does not reaffirm the discharged debt. TDRs are separately identified for impairment disclosures and are measured at the present value of estimated future cash flows using the loan’s effective rate at inception. If a TDR is considered to be a collateral dependent loan, the loan is reported, net, at the fair value of the collateral. Income Recognition Income earned by the Corporation and its subsidiaries is recognized on the accrual basis of accounting, except for nonaccrual loans as previously discussed, and late charges on loans which are recognized as income when they are collected. Premises and Equipment Land is carried at cost and is not subject to depreciation. Premises and equipment are carried at cost, less accumulated depreciation and amortization. Depreciation is generally provided on the straight-line method over the estimated useful lives of the related assets. Leasehold improvements are amortized over the shorter of the remaining lease period or the estimated useful lives of the improvements. Upon the sale or other disposal of an asset, the cost and related accumulated depreciation are removed from the accounts and the resulting gain or loss is recognized. Maintenance and repairs are charged to expense as incurred while renewals and improvements that extend the useful life of an asset are capitalized. Premises and equipment are evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount of a particular asset may not be recoverable. The range of depreciable lives over which premises and equipment are being depreciated are: Buildings 30 Years Equipment, furniture and fixtures 3 to 12 Years Leasehold improvements 1 to 10 Years Other Real Estate Owned ("OREO") Management transfers a loan to OREO at the time that Park takes deed/title of the asset. OREO is initially recorded at fair value less anticipated selling costs (net realizable value), establishing a new cost basis, and consists of property acquired through foreclosure and real estate held for sale. If the net realizable value is below the carrying value of the loan at the date of transfer, the difference is charged to the allowance for loan losses. These assets are subsequently accounted for at the lower of cost or fair value less costs to sell. Subsequent changes in the value of real estate are classified as OREO valuation adjustments, are reported as adjustments to the carrying amount of OREO and are recorded within “Other income”. In certain circumstances where management believes the devaluation may not be permanent in nature, Park utilizes a valuation allowance to record OREO devaluations, which is also expensed through “Other income”. Costs relating to development and improvement of such properties are capitalized (not in excess of fair value less estimated costs to sell) and costs relating to holding the properties are charged to "Other expense". Mortgage Servicing Rights ("MSR") When Park sells mortgage loans with servicing rights retained, servicing rights are recorded at an amount not to exceed fair value with the income statement effect recorded in "Other service income." Capitalized servicing rights are amortized in proportion to and over the period of the estimated future servicing income of the underlying loan and are included within “Other service income”. Mortgage servicing rights are assessed for impairment periodically, based on fair value, with any impairment recognized through a valuation allowance. The fair value of mortgage servicing rights is determined by discounting estimated future cash flows from the servicing assets, using market discount rates and expected future prepayment rates. In order to calculate fair value, the sold loan portfolio is stratified into homogeneous pools of like categories. (See Note 24 - Loan Servicing.) Fees received for servicing mortgage loans owned by investors are based on a percentage of the outstanding monthly principal balance of such loans and are included in income as loan payments are received. The cost of servicing loans is charged to expense as incurred. Goodwill Goodwill represents the excess of the purchase price over net identifiable tangible and intangible assets acquired in a purchase business combination. 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, 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. 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, 2016, the goodwill remaining on Park's Consolidated Balance Sheet consisted entirely of goodwill at PNB. (See Note 27 - Segment Information for operating segment results.) 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, 2016, 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. Goodwill in the amount of $72.3 million was recorded at each of December 31, 2016, 2015, and 2014. 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 to be held in treasury is recorded at cost. At the date of retirement or subsequent reissuance, the treasury shares account is reduced by the weighted average cost of the common shares retired or reissued. Comprehensive Income Comprehensive income consists of net income and other comprehensive income (loss). Other comprehensive income (loss) includes unrealized gains and losses on securities available for sale, and changes in the funded status of the Company’s defined benefit pension plan, which are also recognized as separate components of equity. Share-Based Compensation Compensation cost is recognized for restricted stock units and stock awards issued to employees and directors, respectively, based on the fair value of these awards at the date of grant. The market price of Park’s common shares at the date of grant is used to estimate the fair value of restricted stock units and stock awards. Compensation cost is recognized over the required service period, generally defined as the vesting period and is recorded in "Salaries" expense. (See Note 17-Share-Based Compensation.) Loan Commitments and Related Financial Instruments Financial instruments include off‑balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded. Fair Value Measurement Fair values of financial instruments are estimated using relevant market information and other assumptions, as more fully disclosed in Note 25 - Fair Value. Fair value estimates involve uncertainties and matters of significant judgment regarding interest rates, credit risk, prepayments, and other factors, especially in the absence of broad markets for particular items. Changes in assumptions or in market conditions could significantly affect the estimates. Transfers of Financial Assets Transfers of financial assets are accounted for as sales, when control over the assets has been relinquished. Control over transferred assets is deemed to be surrendered when the assets have been isolated from the Company, the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity. Retirement Plans Pension expense is the net of service and interest cost, return on plan assets and amortization of gains and losses not immediately recognized. Employee KSOP plan expense is the amount of matching contributions to Park's employees stock ownership plan. Deferred compensation and supplemental retirement plan expense allocates the benefits over years of service. (See Note 18 - Benefit Plans.) Earnings Per Common Share Basic earnings per common share is net income available to common shareholders divided by the weighted average number of common shares outstanding during the period. Diluted earnings per common share includes the dilutive effect of additional potential common shares issuable under stock awards, stock options, warrants and convertible securities. Earnings and dividends per common share are restated for any stock splits and stock dividends through the date of issuance of the consolidated financial statements. (See Note 21 - Earnings Per Common Share.) Operating Segments The Corporation is a financial holding company headquartered in Newark, Ohio. The operating segments for the Corporation are its chartered national bank subsidiary, PNB (headquartered in Newark, Ohio), SE Property Holdings, LLC ("SEPH"), and Guardian Financial Services Company ("GFSC").

Adoption of New Accounting Pron

Adoption of New Accounting Pronouncements (Notes)	12 Months Ended
	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	Adoption of New Accounting Pronouncements and Issued Not Yet Effective Accounting Standards ASU 2014-09 - Revenue from Contracts with Customers (Topic 606): In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). The ASU creates a new topic, Topic 606, to provide guidance on revenue recognition for entities that enter into contracts with customers to transfer goods or services or enter into contracts for the transfer of nonfinancial assets. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Additional disclosures are required to provide quantitative and qualitative information regarding the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The new guidance is effective for annual reporting periods, and interim reporting periods within those annual periods, beginning after December 15, 2017. While interest income is specifically out of scope of this standard, management is currently evaluating the revenue streams within "Other income" to assess the applicability of this standard. Specifically, management is evaluating the impact of this new guidance on deposit fees recorded within "Service Charges on Deposit Accounts" and trust income within "Income from Fiduciary Activities." ASU 2015-02 - Consolidation (Topic 810): Amendments to the Consolidation Analysis : In February 2015, the FASB issued ASU 2015-02, Consolidation (Topic 810) : Amendments to the Consolidation Analysis . The ASU amends the current consolidation guidance and affect both the variable interest entity and voting interest entity consolidation models. The new guidance is effective for annual reporting periods and interim reporting periods within those annual periods, beginning after December 15, 2015. The adoption of this guidance on January 1, 2016 did not have an impact on Park’s consolidated financial statements. ASU 2016-01 - Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. In January 2016, the FASB issued ASU 2016-01 - Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. Changes to the current U.S. GAAP model primarily affect the accounting for equity investments, financial liabilities under the fair value option, and the presentation and disclosure requirements for financial instruments. In addition, the ASU clarifies guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale securities. The new guidance is effective for annual reporting periods and interim reporting periods within those annual periods, beginning after December 15, 2017. The adoption of this guidance is not expected to have a material impact on Park's consolidated financial statements. ASU 2016-02 - Leases (Topic 842): In February 2016, the FASB issued ASU 2016-02 - Leases (Topic 842) . The ASU will require all organizations that lease assets to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases. Additional qualitative and quantitative disclosures will be required so that users can understand more about the nature of an entity’s leasing activities. The new guidance is effective for annual reporting periods and interim reporting periods within those annual periods, beginning after December 15, 2018. Early adoption is permitted. Management is currently analyzing data on leased assets. The adoption of this guidance is expected to increase both assets and liabilities, but is not expected to have a material impact on Park's consolidated statement of income. ASU 2016-09 - Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting: In March 2016, FASB issued ASU 2016-09 - Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting . The ASU provides simplification for several aspects of accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The new guidance is effective for annual reporting periods and interim reporting periods within those annual periods, beginning after December 15, 2016. Early adoption was permitted. The adoption of this guidance on January 1, 2017 did not have a material impact on Park's consolidated financial statements. ASU 2016-13 - Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments: In June 2016, FASB issued ASU 2016-13 - Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments . The new guidance replaces the incurred loss model with an expected loss model, which is referred to as the current expected credit loss ("CECL") model. The CECL model is applicable to the measurement of credit losses on financial assets measured at amortized cost, including loan receivables, HTM debt securities, and reinsurance receivables. It also applies to off-balance sheet credit exposures not accounted for as insurance (loan commitments, standby letters of credit, financial guarantees, and other similar instruments) and net investments in leases recognized by a lessor. The CECL model requires an entity to estimate the credit losses over the life of an asset or off-balance sheet exposure. The new guidance is effective for annual reporting periods and interim reporting periods within those annual periods, beginning after December 15, 2019. Early adoption is permitted for annual reporting periods and interim reporting periods within those annual periods, beginning after December 15, 2018. Management is currently evaluating the impact of the adoption of this guidance on Park's consolidated financial statements. We anticipate that the adoption of the CECL model will result in a material increase to Park's allowance for loan losses. Management has established a committee to oversee the implementation of CECL. This committee is currently assessing the data and system requirements necessary for adoption. Management plans to run our current model and a CECL model concurrently for 12 months prior to the adoption of this guidance on January 1, 2020. ASU 2016-15 - Statement of Cash Flows (Topic 203): Classification of Certain Cash Receipts and Cash Payments (a consensus of the Emerging Issues Task Force): In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 203): Classification of Certain Cash Receipts and Cash Payments (a consensus of the Emerging Issues Task Force) . This ASU provides guidance on eight specific cash flow issues where current GAAP is either unclear or does not include specific guidance. The new guidance is effective for annual reporting periods, and interim reporting periods within those annual periods, beginning after December 15, 2017. As such transactions arise, management will utilize the updated guidance within Park’s consolidated statements of cash flows. ASU 2017-04 - Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment: In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. This ASU eliminates Step 2 from the goodwill impairment test. Instead, under the new guidance, an entity should perform its annual goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An impairment charge would be recognized for the amount by which the carrying amount exceeds the reporting unit's fair value. The new guidance is effective for annual reporting periods, and interim reporting periods within those annual periods, beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The adoption of this guidance is not expected to have an impact on Park's consolidated financial statements.

Organization

Organization	12 Months Ended
	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization Park National Corporation is a financial holding company headquartered in Newark, Ohio. Through its national bank subsidiary, PNB, Park is engaged in a general commercial banking and trust business, primarily in Ohio. PNB operates through eleven banking divisions with the Park National Bank Division headquartered in Newark, Ohio, the Fairfield National Bank Division headquartered in Lancaster, Ohio, The Park National Bank of Southwest Ohio & Northern Kentucky Division headquartered in Cincinnati, Ohio, the First-Knox National Bank Division headquartered in Mount Vernon, Ohio, the Farmers Bank Division headquartered in Loudonville, Ohio, the Security National Bank Division headquartered in Springfield, Ohio, the Unity National Bank Division headquartered in Piqua, Ohio, the Richland Bank Division headquartered in Mansfield, Ohio, the Century National Bank Division headquartered in Zanesville, Ohio, the United Bank, N.A. Division headquartered in Bucyrus, Ohio and the Second National Bank Division headquartered in Greenville, Ohio. A wholly-owned subsidiary of Park, GFSC is a consumer finance company located in Central Ohio. Through February 16, 2012, Park operated a second banking subsidiary, Vision Bank ("Vision"), which was engaged in a general commercial banking business, primarily in Baldwin County, Alabama and the panhandle of Florida. Promptly following the sale of the Vision business to Centennial Bank (a wholly-owned subsidiary of HomeBanc Shares, Inc.), Vision surrendered its Florida banking charter to the Florida Office of Financial Regulation and became a non-bank Florida corporation. Vision (the Florida corporation) merged with and into a wholly-owned, non-bank subsidiary of Park, SEPH, with SEPH being the surviving entity. SEPH holds the remaining assets and liabilities retained by Vision subsequent to the sale. SEPH also holds OREO that had previously been transferred to SEPH from Vision. SEPH's assets consist primarily of performing and nonperforming loans and OREO. This segment represents a run off portfolio of the legacy Vision assets. All of the Ohio-based banking divisions provide the following principal services: the acceptance of deposits for demand, savings and time accounts; commercial, industrial, consumer and real estate lending, including installment loans, credit cards, home equity lines of credit; trust services; cash management; safe deposit operations; electronic funds transfers and a variety of additional banking-related services. See Note 27 - Segment Information for financial information on the Corporation’s operating segments.

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Investments Securities	Investment Securities The amortized cost and fair value of investment securities are shown in the following tables. Management performs a quarterly evaluation of investment securities for any other-than-temporary impairment. During 2016 , 2015 and 2014, there were no investment securities deemed to be other-than-temporarily impaired. Investment securities at December 31, 2016 and December 31, 2015 were as follows: (In thousands) Amortized Cost Gross Unrealized/Unrecognized Holding Gains Gross Unrealized/Unrecognized Holding Losses Estimated Fair Value 2016: Securities Available-for-Sale Obligations of U.S. Treasury and other U.S. Government sponsored entities $ 270,000 $ — $ 2,467 $ 267,533 U.S. Government sponsored entities’ asset-backed securities 991,642 5,372 9,842 987,172 Other equity securities 1,119 2,315 — 3,434 Total $ 1,262,761 $ 7,687 $ 12,309 $ 1,258,139 2016: Securities Held-to-Maturity Obligations of states and political subdivisions $ 188,622 $ 977 $ 5,148 $ 184,451 U.S. Government sponsored entities’ asset-backed securities 71,211 1,097 87 72,221 Total $ 259,833 $ 2,074 $ 5,235 $ 256,672 (In thousands) Amortized Cost Gross Unrealized/Unrecognized Holding Gains Gross Unrealized/Unrecognized Holding Losses Estimated Fair Value 2015: Securities Available-for-Sale Obligations of U.S. Treasury and other U.S. Government sponsored entities $ 527,605 $ — $ 5,542 $ 522,063 U.S. Government sponsored entities’ asset-backed securities 907,989 8,776 5,272 911,493 Other equity securities 1,120 1,590 — 2,710 Total $ 1,436,714 $ 10,366 $ 10,814 $ 1,436,266 2015: Securities Held-to-Maturity Obligations of states and political subdivisions $ 48,190 $ 734 $ — $ 48,924 U.S. Government sponsored entities’ asset-backed securities 101,112 1,526 134 102,504 Total $ 149,302 $ 2,260 $ 134 $ 151,428 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, 2016 , the amortized cost of Park’s available-for-sale mortgage-backed securities was $545.1 million and there were no held-to-maturity mortgage-backed securities within Park's investment portfolio. At December 31, 2016 , the amortized cost of Park's available-for-sale and held-to-maturity CMOs was $446.5 million and $71.2 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, 2016 and December 31, 2015 : Less than 12 Months 12 Months or Longer Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses 2016: Securities Available-for-Sale Obligations of U.S. Treasury and other U.S. Government sponsored entities $ 247,695 $ 2,305 $ 19,838 $ 162 $ 267,533 $ 2,467 U.S. Government sponsored entities' asset-backed securities 612,321 9,473 27,325 369 639,646 9,842 Total $ 860,016 $ 11,778 $ 47,163 $ 531 $ 907,179 $ 12,309 2016: Securities Held-to-Maturity Obligations of states and political subdivisions $ 134,909 $ 5,148 $ — $ — $ 134,909 $ 5,148 U.S. Government sponsored entities’ asset-backed securities — — 7,564 87 7,564 87 Total $ 134,909 $ 5,148 $ 7,564 $ 87 $ 142,473 $ 5,235 Less than 12 Months 12 Months or Longer Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses 2015: Securities Available-for-Sale Obligations of U.S. Treasury and other U.S. Government sponsored entities $ 326,973 $ 2,117 $ 195,090 $ 3,425 $ 522,063 $ 5,542 U.S. Government sponsored entities' asset-backed securities 384,169 2,776 114,543 2,496 498,712 5,272 Total $ 711,142 $ 4,893 $ 309,633 $ 5,921 $ 1,020,775 $ 10,814 2015: Securities Held-to-Maturity U.S. Government sponsored entities' asset-backed securities $ 5,656 $ 10 $ 7,792 $ 124 $ 13,448 $ 134 Management does not believe any individual unrealized loss as of December 31, 2016 or 2015 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, the FRB and other equities carried at cost. The FHLB and FRB restricted stock investments are carried at their redemption value. Park owned $50.1 million of FHLB stock and $8.2 million of FRB stock at both December 31, 2016 and December 31, 2015 . Park owned $3.5 million of other equities carried at cost at December 31, 2016 and carried no other equities held at cost at December 31, 2015 . The amortized cost and estimated fair value of investments in debt securities at December 31, 2016 , are shown in the following table by contractual maturity, except for asset-backed securities, which are shown as a single total, due to the unpredictability of the timing in principal repayments. (In thousands) Amortized Cost Estimated Fair Value Tax Equivalent Yield (1) Securities Available-for-Sale U.S. Treasury and other U.S. Government sponsored entities’ notes: Due within one year $ 25,000 $ 24,933 0.87 % Due one through five years 245,000 242,600 1.22 % Total $ 270,000 $ 267,533 1.18 % U.S. Government sponsored entities’ asset-backed securities $ 991,642 $ 987,172 2.10 % Securities Held-to-Maturity Obligations of states and political subdivisions Due greater than ten years $ 188,622 $ 184,451 4.50 % Total $ 188,622 $ 184,451 4.50 % U.S. Government sponsored entities’ asset-backed securities $ 71,211 $ 72,221 3.31 % (1) The tax equivalent yield for obligations of states and political subdivisions includes the effects of a taxable equivalent adjustment using a 35% rate. The taxable equivalent adjustment was $1.4 million for the year ended December 31, 2016. All 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 0.9 years to 3.5 years. The remaining weighted average life of the investment portfolio is 4.4 years. At December 31, 2016 , investment securities with an amortized cost of $343 million were pledged for government and trust department deposits, $569 million were pledged to secure repurchase agreements and $25 million were pledged as collateral for FHLB advance borrowings. At December 31, 2015 , investment securities with an amortized cost of $429 million were pledged for government and trust department deposits, $622 million were pledged to secure repurchase agreements and $21 million were pledged as collateral for FHLB advance borrowings. At December 31, 2016 , there were no holdings of securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of shareholders’ equity. During 2015, Park sold certain HTM investment securities with a book value of $3.1 million at a gain of $88,000 . These securities had been paid down to 97.8% of the principal outstanding at acquisition. During 2014, Park sold certain AFS investment securities with a book value of $187,000 at a gain of $22,000 . Additionally, Park sold certain AFS investment securities with a book value of $174.1 million at a loss of $1.2 million . No securities were sold during 2016.

Loans

Loans	12 Months Ended
	Dec. 31, 2016
Loans and Leases Receivable Disclosure [Abstract]
Loans	Loans The composition of the loan portfolio, by class of loan, as of December 31, 2016 and December 31, 2015 was as follows: 12/31/2016 12/31/2015 (In thousands) Loan Balance Accrued Interest Receivable Recorded Investment Loan Balance Accrued Interest Receivable Recorded Investment Commercial, financial and agricultural * $ 994,619 $ 3,558 $ 998,177 $ 955,727 $ 3,437 $ 959,164 Commercial real estate * 1,155,703 4,161 1,159,864 1,113,603 4,009 1,117,612 Construction real estate: SEPH commercial land and development — — — 2,044 — 2,044 Remaining commercial 135,343 398 135,741 128,046 321 128,367 Mortgage 48,699 106 48,805 36,722 75 36,797 Installment 4,903 17 4,920 6,533 21 6,554 Residential real estate: Commercial 406,687 940 407,627 410,571 1,014 411,585 Mortgage 1,169,495 1,459 1,170,954 1,210,819 1,469 1,212,288 HELOC 212,441 853 213,294 211,415 769 212,184 Installment 19,874 67 19,941 22,638 78 22,716 Consumer 1,120,850 3,385 1,124,235 967,111 3,032 970,143 Leases 3,243 29 3,272 2,856 14 2,870 Total loans $ 5,271,857 $ 14,973 $ 5,286,830 $ 5,068,085 $ 14,239 $ 5,082,324 * Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class. Loans are shown net of deferred origination fees, costs and unearned income of $11.1 million at December 31, 2016 and $10.4 million at December 31, 2015 , which represented a net deferred income position in both years. Overdrawn deposit accounts of $2.9 million and $1.7 million had been reclassified to loans at December 31, 2016 and 2015 , respectively, and are included in the commercial, financial and agricultural loan class above. Credit Quality The following table presents the recorded investment in nonaccrual loans, accruing troubled debt restructurings ("TDRs"), and loans past due 90 days or more and still accruing by class of loan as of December 31, 2016 and December 31, 2015 : 12/31/2016 (In thousands) Nonaccrual Loans Accruing Troubled Debt Restructurings Loans Past Due 90 Days or More and Accruing Total Nonperforming Loans Commercial, financial and agricultural $ 20,057 $ 600 $ 15 $ 20,672 Commercial real estate 19,169 5,305 — 24,474 Construction real estate: SEPH commercial land and development — — — — Remaining commercial 1,833 393 — 2,226 Mortgage — 104 — 104 Installment 61 95 12 168 Residential real estate: Commercial 23,013 89 — 23,102 Mortgage 18,313 9,612 887 28,812 HELOC 1,783 673 25 2,481 Installment 644 609 60 1,313 Consumer 2,949 748 1,139 4,836 Total loans $ 87,822 $ 18,228 $ 2,138 $ 108,188 12/31/2015 (In thousands) Nonaccrual Loans Accruing Troubled Debt Restructurings Loans Past Due 90 Days or More and Accruing Total Nonperforming Loans Commercial, financial and agricultural $ 21,676 $ 8,947 $ — $ 30,623 Commercial real estate 15,268 2,757 — 18,025 Construction real estate: SEPH commercial land and development 2,044 — — 2,044 Remaining commercial 4,162 514 — 4,676 Mortgage 7 110 — 117 Installment 64 114 — 178 Residential real estate: Commercial 25,063 261 — 25,324 Mortgage 20,378 10,143 851 31,372 HELOC 1,749 873 27 2,649 Installment 1,657 635 4 2,296 Consumer 3,819 734 1,093 5,646 Total loans $ 95,887 $ 25,088 $ 1,975 $ 122,950 The following table provides additional information regarding those nonaccrual and accruing TDR loans that are individually evaluated for impairment and those collectively evaluated for impairment as of December 31, 2016 and December 31, 2015 . 12/31/2016 12/31/2015 (In thousands) Nonaccrual and accruing TDRs Loans individually evaluated for impairment Loans collectively evaluated for impairment Nonaccrual and accruing TDRs Loans individually evaluated for impairment Loans collectively evaluated for impairment Commercial, financial and agricultural $ 20,657 $ 20,624 $ 33 $ 30,623 $ 30,595 $ 28 Commercial real estate 24,474 24,474 — 18,025 18,025 — Construction real estate: SEPH commercial land and development — — — 2,044 2,044 — Remaining commercial 2,226 2,226 — 4,676 4,676 — Mortgage 104 — 104 117 — 117 Installment 156 — 156 178 — 178 Residential real estate: Commercial 23,102 23,102 — 25,324 25,324 — Mortgage 27,925 — 27,925 30,521 — 30,521 HELOC 2,456 — 2,456 2,622 — 2,622 Installment 1,253 — 1,253 2,292 — 2,292 Consumer 3,697 — 3,697 4,553 — 4,553 Total loans $ 106,050 $ 70,426 $ 35,624 $ 120,975 $ 80,664 $ 40,311 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, 2016 and December 31, 2015 . 12/31/2016 12/31/2015 (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 $ 41,075 $ 19,965 $ — $ 32,583 $ 18,763 $ — Commercial real estate 23,961 23,474 — 15,138 14,916 — Construction real estate: SEPH commercial land and development — — — 10,834 2,044 — Remaining commercial 3,662 2,226 — 2,506 1,531 — Residential real estate: Commercial 24,409 22,687 — 23,798 23,480 — With an allowance recorded Commercial, financial and agricultural 810 659 152 16,155 11,832 1,904 Commercial real estate 1,014 1,000 309 3,195 3,109 381 Construction real estate: Remaining commercial — — — 3,145 3,145 1,356 Residential real estate: Commercial 427 415 87 1,951 1,844 550 Total $ 95,358 $ 70,426 $ 548 $ 109,305 $ 80,664 $ 4,191 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, 2016 and December 31, 2015 , there were $24.7 million and $24.2 million , respectively, of partial charge-offs on loans individually evaluated for impairment with no related allowance recorded and $177,000 and $4.5 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, 2016 and 2015 , of $0.5 million and $4.2 million , respectively. These loans with specific reserves had a recorded investment of $2.1 million and $19.9 million as of December 31, 2016 and 2015 , respectively. Interest income on nonaccrual loans individually evaluated for impairment is recognized on a cash basis only when Park expects to receive the entire recorded investment of the loan. Interest income on accruing TDRs individually evaluated for impairment continues to be recorded on an accrual basis. The following tables present the average recorded investment and interest income recognized during the year subsequent to impairment on loans individually evaluated for impairment as of and for the years ended December 31, 2016 , 2015 , and 2014 : Year ended December 31, 2016 (In thousands) Recorded Investment as of December 31, 2016 Average recorded investment Interest income recognized Commercial, financial and agricultural $ 20,624 $ 26,821 $ 885 Commercial real estate 24,474 22,828 884 Construction real estate: SEPH commercial land and development — 1,597 — Remaining commercial 2,226 3,906 66 Residential real estate: Commercial 23,102 24,341 2,942 Consumer — 3 — Total $ 70,426 $ 79,496 $ 4,777 Year ended December 31, 2015 (In thousands) Recorded Investment as of December 31, 2015 Average recorded investment Interest income recognized Commercial, financial and agricultural $ 30,595 $ 20,179 $ 340 Commercial real estate 18,025 17,883 550 Construction real estate: SEPH commercial land and development 2,044 2,066 21 Remaining commercial 4,676 5,666 26 Residential real estate: Commercial 25,324 24,968 1,026 Consumer — — — Total $ 80,664 $ 70,762 $ 1,963 Year ended December 31, 2014 (In thousands) Recorded Investment as of December 31, 2014 Average recorded investment Interest income recognized Commercial, financial and agricultural $ 19,106 $ 19,518 $ 360 Commercial real estate 21,989 31,945 1,027 Construction real estate: SEPH commercial land and development 2,078 3,658 146 Remaining commercial 5,609 8,784 61 Residential real estate: Commercial 24,930 28,306 1,084 Consumer — 403 — Total $ 73,712 $ 92,614 $ 2,678 The following tables present the aging of the recorded investment in past due loans as of December 31, 2016 and December 31, 2015 by class of loan. 12/31/2016 (In thousands) Accruing loans past due 30-89 days Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) Total past due Total current (2) Total recorded investment Commercial, financial and agricultural $ 371 $ 4,113 $ 4,484 $ 993,693 $ 998,177 Commercial real estate 355 2,499 2,854 1,157,010 1,159,864 Construction real estate: SEPH commercial land and development — — — — — Remaining commercial — 541 541 135,200 135,741 Mortgage 559 — 559 48,246 48,805 Installment 223 64 287 4,633 4,920 Residential real estate: Commercial 330 3,631 3,961 403,666 407,627 Mortgage 10,854 9,769 20,623 1,150,331 1,170,954 HELOC 970 1,020 1,990 211,304 213,294 Installment 350 319 669 19,272 19,941 Consumer 12,579 2,094 14,673 1,109,562 1,124,235 Leases — — — 3,272 3,272 Total loans $ 26,591 $ 24,050 $ 50,641 $ 5,236,189 $ 5,286,830 (1) Includes an aggregate of $2.1 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans. (2) Includes an aggregate of $65.9 million of nonaccrual loans which are current in regards to contractual principal and interest payments. 12/31/2015 (In thousands) Accruing loans past due 30-89 days Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) Total past due Total current (2) Total recorded investment Commercial, financial and agricultural $ 670 $ 7,536 $ 8,206 $ 950,958 $ 959,164 Commercial real estate 142 530 672 1,116,940 1,117,612 Construction real estate: SEPH commercial land and development — 2,044 2,044 — 2,044 Remaining commercial 165 84 249 128,118 128,367 Mortgage 63 7 70 36,727 36,797 Installment 200 46 246 6,308 6,554 Residential real estate: Commercial 325 19,521 19,846 391,739 411,585 Mortgage 10,569 8,735 19,304 1,192,984 1,212,288 HELOC 487 186 673 211,511 212,184 Installment 426 318 744 21,972 22,716 Consumer 11,458 3,376 14,834 955,309 970,143 Leases — — — 2,870 2,870 Total loans $ 24,505 $ 42,383 $ 66,888 $ 5,015,436 $ 5,082,324 (1) Includes an aggregate of $2.0 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans. (2) Includes an aggregate of $55.5 million of nonaccrual loans which are current in regards to contractual principal and interest payments. Credit Quality Indicators Management utilizes past due information as a credit quality indicator across the loan portfolio. Past due information as of December 31, 2016 and 2015 is included in the tables above. The past due information is the primary credit quality indicator within the following classes of loans: (1) mortgage loans and installment loans in the construction real estate segment; (2) mortgage loans, HELOC and installment loans in the residential real estate segment; and (3) consumer loans. The primary credit indicator for commercial loans is based on an internal grading system that grades all commercial loans on a scale from 1 to 8. Credit grades are continuously monitored by the responsible loan officer and adjustments are made when appropriate. A grade of 1 indicates little or no credit risk and a grade of 8 is considered a loss. Commercial loans that are pass-rated (graded a 1 through a 4) are considered to be of acceptable credit risk. Commercial loans graded a 5 (special mention) are considered to be watch list credits and a higher loan loss reserve percentage is allocated to these loans. Loans classified as special mention have potential weaknesses that require management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of Park’s credit position at some future date. Commercial loans graded a 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 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 placed on nonaccrual status and 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, 2016 and December 31, 2015 for all commercial loans: 12/31/2016 (In thousands) 5 Rated 6 Rated Impaired Pass Rated Recorded Investment Commercial, financial and agricultural* $ 5,826 $ — $ 20,657 $ 971,694 $ 998,177 Commercial real estate* 7,548 190 24,474 1,127,652 1,159,864 Construction real estate: SEPH commercial land and development — — — — — Remaining commercial 287 118 2,226 133,110 135,741 Residential real estate: Commercial 1,055 124 23,102 383,346 407,627 Leases — — — 3,272 3,272 Total Commercial Loans $ 14,716 $ 432 $ 70,459 $ 2,619,074 $ 2,704,681 * Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class. 12/31/2015 (In thousands) 5 Rated 6 Rated Impaired Pass Rated Recorded Investment Commercial, financial and agricultural* $ 4,392 $ 347 $ 30,623 $ 923,802 $ 959,164 Commercial real estate* 14,880 3,417 18,025 1,081,290 1,117,612 Construction real estate: SEPH commercial land and development — — 2,044 — 2,044 Remaining commercial 2,151 122 4,676 121,418 128,367 Residential real estate: Commercial 3,280 386 25,324 382,595 411,585 Leases — — — 2,870 2,870 Total Commercial Loans $ 24,703 $ 4,272 $ 80,692 $ 2,511,975 $ 2,621,642 * Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class. Troubled Debt Restructuring Management classifies loans as TDRs when a borrower is experiencing financial difficulties and Park has granted a concession to the borrower as part of a modification or in the loan renewal process. In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed of the probability that the borrower will be in payment default on any of the borrower's debt in the foreseeable future without the modification. This evaluation is performed in accordance with the Company’s internal underwriting policy. Management’s policy is to modify loans by extending the term or by granting a temporary or permanent contractual interest rate below the market rate, not by forgiving debt. A court's discharge of a borrower's debt in a Chapter 7 bankruptcy is considered a concession when the borrower does not reaffirm the discharged debt. Certain loans which were modified during the years ended December 31, 2016 and December 31, 2015 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, 2016 and 2015 , Park removed the TDR classification on $2.7 million and $1.2 million , respectively, of loans that met the requirements discussed above. At December 31, 2016 and 2015 , there were $46.9 million and $41.1 million , respectively, of TDRs included in the nonaccrual loan totals. At December 31, 2016 and 2015 , $38.0 million and $19.1 million , respectively, of these nonaccrual TDRs were performing in accordance with the terms of the restructured note. As of December 31, 2016 and 2015 , loans with a recorded investment of $18.2 million and $25.1 million , respectively, were included in accruing TDR 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, 2016 and 2015 , Park had commitments to lend $0.7 million and $2.3 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, 2016 and 2015 was $0.2 million and $2.3 million , respectively. Modifications made in 2015 and 2016 were largely the result of renewals and extending the maturity date of the loan, at terms consistent with the original note. These modifications were deemed to be TDRs primarily due to Park’s conclusion that the borrower would likely not have qualified for similar terms through another lender. Many of the modifications deemed to be TDRs were previously identified as impaired loans, and thus were also previously evaluated for impairment under ASC 310. Additional specific reserves of $1.0 million were recorded during the year ended December 31, 2016 , as a result of TDRs identified in the 2016 year. Additional specific reserves of $1.3 million were recorded during the year ended December 31, 2015 as a result of TDRs identified in the 2015 year. Additional specific reserves of $0.7 million were recorded during the year ended December 31, 2014 as a result of TDRs identified in the 2014 year. The terms of certain other loans were modified during the years ended December 31, 2016 and 2015 that did not meet the definition of a TDR. Modified substandard commercial loans which did not meet the definition of a TDR had a total recorded investment as of December 31, 2016 and 2015 of $26,000 and $116,000 , respectively. The renewal/modification of these loans: (1) resulted in a delay in a payment that was considered to be insignificant, or (2) 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, 2016 and 2015 of $7.4 million and $16.5 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, 2016 , 2015 and 2014 as well as the recorded investment of these contracts at December 31, 2016 , 2015 , and 2014. The recorded investment pre- and post-modification is generally the same due to the fact that Park does not typically forgive principal. Year ended December 31, 2016 (In thousands) Number of Contracts Accruing Nonaccrual Recorded Investment Commercial, financial and agricultural 32 $ 191 $ 8,450 $ 8,641 Commercial real estate 14 3,844 2,537 6,381 Construction real estate: SEPH commercial land and development — — — — Remaining commercial 2 — 1,143 1,143 Mortgage — — — — Installment 1 — — — Residential real estate: Commercial 11 89 1,033 1,122 Mortgage 34 114 2,292 2,406 HELOC 13 104 178 282 Installment 5 102 3 105 Consumer 293 184 994 1,178 Total loans 405 $ 4,628 $ 16,630 $ 21,258 Year ended December 31, 2015 (In thousands) Number of Contracts Accruing Nonaccrual Recorded Investment Commercial, financial and agricultural 39 $ 8,948 $ 3,640 $ 12,588 Commercial real estate 14 637 3,523 4,160 Construction real estate: SEPH commercial land and development — — — — Remaining commercial 2 513 — 513 Mortgage 1 19 — 19 Installment — — — — Residential real estate: Commercial 11 — 1,185 1,185 Mortgage 39 1,132 2,122 3,254 HELOC 26 315 45 360 Installment 9 — 155 155 Consumer 283 202 888 1,090 Total loans 424 $ 11,766 $ 11,558 $ 23,324 Year ended December 31, 2014 (In thousands) Number of Contracts Accruing Nonaccrual Recorded Investment Commercial, financial and agricultural 30 $ 292 $ 431 $ 723 Commercial real estate 11 1,184 1,254 2,438 Construction real estate: SEPH commercial land and development — — — — Remaining commercial 2 — 206 206 Mortgage — — — — Installment 2 — 56 56 Residential real estate: Commercial 9 — 866 866 Mortgage 46 32 2,325 2,357 HELOC 10 85 241 326 Installment 10 109 12 121 Consumer 330 244 1,058 1,302 Total loans 450 $ 1,946 $ 6,449 $ 8,395 Of those loans which were modified and determined to be a TDR during the year ended December 31, 2016 , $9.4 million were on nonaccrual status as of December 31, 2015 . Of those loans which were modified and determined to be a TDR during the year ended December 31, 2015 , $0.8 million were on nonaccrual status as of December 31, 2014 . Of those loans which were modified and determined to be a TDR during the year ended December 31, 2014, $0.7 million were on nonaccrual status as of December 31, 2013. 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, 2016 , December 31, 2015 , and December 31, 2014. For this table, a loan is considered to be in default when it becomes 30 days contractually past due under the modified terms. The additional allowance for loan loss resulting from the defaults on TDR loans was immaterial. Year ended December 31, 2016 Year ended Year ended (In thousands) Number of Contracts Recorded Investment Number of Contracts Recorded Investment Number of Contracts Recorded Investment Commercial, financial and agricultural 7 $ 419 1 $ 1 4 $ 206 Commercial real estate 5 843 1 626 1 302 Construction real estate: SEPH commercial land and development — — — — — — Remaining commercial — — — — — — Mortgage — — — — — — Installment — — — — — — Residential real estate: Commercial 7 848 3 1,005 1 3 Mortgage 15 1,201 12 682 14 810 HELOC — — 1 5 2 160 Installment 1 3 2 101 2 12 Consumer 62 484 47 434 62 516 Leases — — — — — — Total loans 97 $ 3,798 $ 67 $ 2,854 86 $ 2,009 Of the $3.8 million in modified TDRs which defaulted during the year ended December 31, 2016 , $111,000 were accruing loans and $3.7 million were nonaccrual loans. Of the $2.9 million in modified TDRs which defaulted during the year ended December 31, 2015 , $44,000 were accruing loans and $2.8 million were nonaccrual loans. Of the $2.0 million in modified TDRs which defaulted during the year ended December 31, 2014, $314,000 were accruing loans and $1.7 million were nonaccrual loans. Certain of the Corporation’s executive officers, directors and related entities of directors are loan customers of PNB. As of December 31, 2016 and 2015 , credit exposure aggregating approximately $43.4 million and $47.0 million , respectively, was outstanding to such parties. Of this total exposure, approximately $29.6 million and $36.0 million was outstanding at December 31, 2016 and 2015 , respectively, with the remaining balance representing available credit. During 2016 , new loans and advances on existing loans were made to these executive officers, directors and related entities of directors totaling $5.4 million and $3.5 million , respectively. These extensions of credit were offset by principal payments of $15.3 million . During 2015 , new loans and advances on existing loans were $5.8 million and $7.1 million , respectively. These extensions of credit were offset by principal payments of $12.9 million .

Allowance for Loan Losses

Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2016
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 the overall growth in the loan portfolio, an analysis of individual loans, prior and current loss experience, and current economic conditions. A provision for loan losses is charged to operations based on management’s periodic evaluation of these and other pertinent factors as discussed within Note 1 - Summary of Significant Accounting Policies. Loss factors are reviewed quarterly and updated at least annually to reflect recent loan loss history and incorporate current risk and trends which may not be recognized in historical data. Several enhancements were made in the third quarter of 2016 as a result of management's quarterly review. • Management updated the historical loss calculation during the third quarter of 2016 , incorporating annualized net charge-offs plus changes in specific reserves through September 30, 2016. Additionally, management removed from the historical loss calculation net charge-offs plus changes in specific reserves for the year ended December 31, 2009. Management's belief has been that historical losses should encompass the complete economic cycle. However, given the extended length of the economic recovery, management determined that 2009 loss data was no longer reflective of the current portfolio. Management has taken the look-back period into consideration in the quarterly evaluation of environmental loss factors. As part of the 2016 mid-year historical loss update, management determined that it was no longer appropriate to more heavily weight those years with higher losses in the historical loss calculation and applied equal percentages to each of the years in this calculation. The trends that existed resulting in management applying different weightings to years within the historical loss calculation no longer appeared to exist, resulting in the adjustment back to equal weightings. • As part of the normal quarterly process, management reviewed and updated the environmental loss factors applied to the commercial portfolio in order to incorporate changes in the macroeconomic environment. Additionally, management updated the calculation of the loss emergence period utilizing a more granular process. The impact of the changes described above resulted in a decrease of $3.8 million in the ALLL at September 30, 2016, compared to what the ALLL would have been had the calculation, and related assumptions, used at June 30, 2016 remained constant. The loss factors were updated in the fourth quarter of 2016 to incorporate losses through December 31, 2016 . The activity in the allowance for loan losses for the years ended December 31, 2016 , 2015 , and 2014 is summarized in the following tables. Year ended December 31, 2016 (In thousands) Commercial, financial and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for credit losses: Beginning balance $ 13,694 $ 9,197 $ 8,564 $ 13,514 $ 11,524 $ 1 $ 56,494 Charge-offs 5,786 412 1,436 3,014 10,151 — 20,799 Recoveries (1,259 ) (3,671 ) (8,559 ) (2,446 ) (4,094 ) (1 ) (20,030 ) Net charge-offs (recoveries) 4,527 (3,259 ) (7,123 ) 568 6,057 (1 ) 769 Provision (Recovery) 4,267 (2,024 ) (10,440 ) (1,988 ) 5,086 (2 ) (5,101 ) Ending balance $ 13,434 $ 10,432 $ 5,247 $ 10,958 $ 10,553 — $ 50,624 Year ended December 31, 2015 (In thousands) Commercial, financial and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for credit losses: Beginning balance $ 10,719 $ 8,808 $ 8,652 $ 14,772 $ 11,401 $ — $ 54,352 Charge-offs 2,478 348 470 2,352 8,642 — 14,290 Recoveries (1,373 ) (2,241 ) (2,092 ) (2,438 ) (3,295 ) (3 ) (11,442 ) Net charge-offs (recoveries) 1,105 (1,893 ) (1,622 ) (86 ) 5,347 (3 ) 2,848 Provision (Recovery) 4,080 (1,504 ) (1,710 ) (1,344 ) 5,470 (2 ) 4,990 Ending balance $ 13,694 $ 9,197 $ 8,564 $ 13,514 $ 11,524 $ 1 $ 56,494 Year ended December 31, 2014 (In thousands) Commercial, financial and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for credit losses: Beginning balance $ 14,218 $ 15,899 $ 6,855 $ 14,251 $ 8,245 $ — $ 59,468 Charge-offs 3,779 8,003 1,316 3,944 7,738 — 24,780 Recoveries (1,003 ) (7,759 ) (12,572 ) (2,985 ) (2,671 ) (7 ) (26,997 ) Net charge-offs (recoveries) 2,776 244 (11,256 ) 959 5,067 (7 ) (2,217 ) (Recovery) Provision (723 ) (6,847 ) (9,459 ) 1,480 8,223 (7 ) (7,333 ) Ending balance $ 10,719 $ 8,808 $ 8,652 $ 14,772 $ 11,401 $ — $ 54,352 Loans collectively evaluated for impairment in the following tables include all performing loans at December 31, 2016 and 2015 , 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, 2016 and 2015 , which are evaluated for impairment in accordance with GAAP (see Note 1 - Summary of Significant Accounting Policies). The composition of the allowance for loan losses at December 31, 2016 and 2015 was as follows: December 31, 2016 (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 $ 152 $ 309 $ — $ 87 $ — $ — $ 548 Collectively evaluated for impairment 13,282 10,123 5,247 10,871 10,553 — 50,076 Total ending allowance balance $ 13,434 $ 10,432 $ 5,247 $ 10,958 $ 10,553 $ — $ 50,624 Loan Balance: Loans individually evaluated for impairment $ 20,622 $ 24,465 $ 2,226 $ 23,102 $ — $ — $ 70,415 Loans collectively evaluated for impairment 973,997 1,131,238 186,719 1,785,395 1,120,850 3,243 5,201,442 Total ending loan balance $ 994,619 $ 1,155,703 $ 188,945 $ 1,808,497 $ 1,120,850 $ 3,243 $ 5,271,857 Allowance for loan losses as a percentage of loan balance: Loans individually evaluated for impairment 0.74 % 1.26 % — % 0.38 % — % — % 0.78 % Loans collectively evaluated for impairment 1.36 % 0.89 % 2.81 % 0.61 % 0.94 % — % 0.96 % Total 1.35 % 0.90 % 2.78 % 0.61 % 0.94 % — % 0.96 % Recorded Investment: Loans individually evaluated for impairment $ 20,624 $ 24,474 $ 2,226 $ 23,102 $ — $ — $ 70,426 Loans collectively evaluated for impairment 977,553 1,135,390 187,240 1,788,714 1,124,235 3,272 5,216,404 Total ending recorded investment $ 998,177 $ 1,159,864 $ 189,466 $ 1,811,816 $ 1,124,235 $ 3,272 $ 5,286,830 December 31, 2015 (In thousands) Commercial, financial, and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for loan losses: Ending allowance balance attributed to loans Individually evaluated for impairment $ 1,904 $ 381 $ 1,356 $ 550 $ — $ — $ 4,191 Collectively evaluated for impairment 11,790 8,816 7,208 12,964 11,524 1 52,303 Total ending allowance balance $ 13,694 $ 9,197 $ 8,564 $ 13,514 $ 11,524 $ 1 $ 56,494 Loan Balance: Loans individually evaluated for impairment $ 30,545 $ 18,015 $ 6,716 $ 25,323 $ — $ — $ 80,599 Loans collectively evaluated for impairment 925,182 1,095,588 166,629 1,830,120 967,111 2,856 4,987,486 Total ending loan balance $ 955,727 $ 1,113,603 $ 173,345 $ 1,855,443 $ 967,111 $ 2,856 $ 5,068,085 Allowance for loan losses as a percentage of loan balance: Loans individually evaluated for impairment 6.23 % 2.11 % 20.19 % 2.17 % — % — % 5.20 % Loans collectively evaluated for impairment 1.27 % 0.80 % 4.33 % 0.71 % 1.19 % 0.04 % 1.05 % Total 1.43 % 0.83 % 4.94 % 0.73 % 1.19 % 0.04 % 1.11 % Recorded Investment: Loans individually evaluated for impairment $ 30,595 $ 18,025 $ 6,720 $ 25,324 $ — $ — $ 80,664 Loans collectively evaluated for impairment 928,569 1,099,587 167,042 1,833,449 970,143 2,870 5,001,660 Total ending recorded investment $ 959,164 $ 1,117,612 $ 173,762 $ 1,858,773 $ 970,143 $ 2,870 $ 5,082,324

Loans Held for Sale (Notes)

Loans Held for Sale (Notes)	12 Months Ended
	Dec. 31, 2016
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 $10.4 million and $7.3 million at December 31, 2016 and 2015 , respectively. These amounts are included in loans on the Consolidated Balance Sheets and in the residential real estate loan segments in Note 5 - Loans and Note 6 - Allowance for Loan Losses. The contractual balance was $10.3 million and $7.2 million at December 31, 2016 and 2015 , respectively. The gain expected upon sale was $131,000 and $95,000 at December 31, 2016 and 2015 , respectively. None of these loans were 90 days or more past due or on nonaccrual status as of December 31, 2016 or 2015 . During 2015, Park transferred to held for sale and sold certain commercial loans previously held for investment with a book balance of $144,000 , and recognized a gain of $756,000 . During 2014, Park transferred certain commercial loans held for investment, with a book balance of $22.0 million , to the loans held for sale portfolio, and subsequently completed the sale of these commercial loans held for sale, recognizing a net gain on sale of $1.9 million . No commercial loans were held for sale or sold during 2016.

Other Real Estate Owned (Notes)

Other Real Estate Owned (Notes)	12 Months Ended
	Dec. 31, 2016
Schedule of Assets Repossessed or Foreclosed, or loans in process of foreclosure [Line Items]
Real Estate Owned [Text Block]	Other Real Estate Owned The carrying amount of foreclosed properties held at December 31, 2016 and December 31, 2015 are listed below, as well as the recorded investment of loans secured by residential real estate properties for which formal foreclosure proceedings were in process at those dates. (In thousands) December 31, 2016 December 31, 2015 OREO: Commercial real estate $ 7,642 $ 8,333 Construction real estate 4,624 7,259 Residential real estate 1,660 3,059 Total OREO $ 13,926 $ 18,651 Loans in process of foreclosure: Residential real estate $ 3,250 $ 2,021

Premises And Equipment

Premises And Equipment	12 Months Ended
	Dec. 31, 2016
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) 2016 2015 Land $ 19,577 $ 19,123 Buildings 75,472 74,525 Equipment, furniture and fixtures 52,719 47,839 Leasehold improvements 3,400 3,878 Total $ 151,168 $ 145,365 Less accumulated depreciation (93,197 ) (85,872 ) Premises and equipment, net $ 57,971 $ 59,493 Depreciation expense amounted to $8.4 million , $7.3 million and $7.2 million for the years ended December 31, 2016 , 2015 and 2014 , 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) 2017 $ 1,508 2018 1,269 2019 1,178 2020 621 2021 422 Thereafter 700 Total $ 5,698 Rent expense for Park was $2.1 million , $1.7 million and $1.7 million , for the years ended December 31, 2016 , 2015 and 2014 , respectively.

Investment in Qualified Afforda

Investment in Qualified Affordable Housing	12 Months Ended
	Dec. 31, 2016
Investments in Qualified Affordable Housing [Abstract]
Equity Method Investments and Joint Ventures Disclosure [Text Block]	Investment in Qualified Affordable Housing Park makes certain equity investments in various limited partnerships that sponsor affordable housing projects. The purposes of these investments are to achieve a satisfactory return on capital, help create affordable housing opportunities, and assist the Company to achieve our goals associated with the Community Reinvestment Act. As permitted by ASU 2014-01, Accounting for Investments in Qualified Affordable Housing Projects , Park elected the proportional amortization method of accounting. Under the proportional amortization method, amortization expense and tax benefits are recognized through the provision for income taxes. The table below details the balances of Park’s affordable housing tax credit investments and related unfunded commitments as of December 31, 2016 and 2015. (In thousands) December 31, 2016 December 31, 2015 Affordable housing tax credit investments $ 52,947 $ 51,247 Unfunded commitments 14,282 20,311 Commitments are funded when capital calls are made by the general partner. Park expects that the current commitment will be funded between 2017 and 2027. During the years ended December 31, 2016, 2015 and 2014, Park recognized amortization expense of $ 7.3 million , $6.7 million and $6.9 million , respectively, which was included within the provision for income taxes. For the years ended December 31, 2016, 2015 and 2014, Park recognized tax credits and other benefits from its affordable housing tax credit investments of $9.4 million , $8.9 million and $8.8 million , respectively.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2016
Deposits [Abstract]
Deposits	Deposits At December 31, 2016 and 2015 , non-interest bearing and interest bearing deposits were as follows: December 31 (In thousands) 2016 2015 Non-interest bearing $ 1,523,417 $ 1,404,032 Interest bearing 3,998,539 3,943,610 Total $ 5,521,956 $ 5,347,642 At December 31, 2016 , the maturities of time deposits were as follows: (In thousands) 2017 $ 717,879 2018 131,236 2019 153,257 2020 63,758 2021 51,245 After 5 years 495 Total $ 1,117,870 At December 31, 2016 and 2015, respectively, Park had approximately $26.5 million and $21.6 million of deposits received from executive officers, directors and related entities of directors. Time deposits that exceed the FDIC Insurance limit of $250,000 at December 31, 2016 and 2015 were $43.3 million and $49.7 million , respectively.

Repurchase Agreements (Notes)

Repurchase Agreements (Notes)	12 Months Ended
	Dec. 31, 2016
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Table Text Block]	Repurchase Agreement Borrowings Securities sold under agreements to repurchase ("repurchase agreements") with customers represent funds deposited by customers, generally on an overnight basis, that are collateralized by investment securities owned by Park. Repurchase agreements with customers are included in short-term borrowings on the Consolidated Balance Sheets. Park's repurchase agreements with a third-party financial institution are classified as long-term debt on the Consolidated Balance Sheets. All repurchase agreements are subject to terms and conditions of repurchase/security agreements between Park and the client and are accounted for as secured borrowings. Park's repurchase agreements reflected in short-term borrowings consist of customer accounts and securities which are pledged on an individual security basis. At December 31, 2016 and December 31, 2015 , Park's repurchase agreement borrowings totaled $510 million and $554 million , respectively. At both December 31, 2016 and December 31, 2015 , $300 million of Park's repurchase agreement borrowings were classified as long-term debt, with the remaining amount being classified as short-term debt on the Consolidated Balance Sheets. These borrowings were collateralized with U.S. government and agency securities with a carrying value of $569 million and $622 million at December 31, 2016 and December 31, 2015 , respectively. Declines in the value of the collateral would require Park to pledge additional securities. As of December 31, 2016 and December 31, 2015 , Park had $640 million and $583 million , respectively, of available unpledged securities. The following table presents the carrying value of Park's repurchase agreements by remaining contractual maturity and collateral pledged at December 31, 2016 and December 31, 2015 : December 31, 2016 (In thousands) Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 days 30 - 90 days Greater than 90 days Total U.S. government and agency securities $ 208,691 $ — $ — $ 301,104 $ 509,795 December 31, 2015 (In thousands) Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 days 30 - 90 days Greater than 90 days Total U.S. government and agency securities $ 247,618 $ 2,239 $ — $ 304,385 $ 554,242 See Note 13 - Short-Term Borrowings for additional information related to repurchase agreements classified as short-term borrowings. See Note 14 - Long-Term Debt for additional information related to repurchase agreements classified as long-term debt.

Short-Term Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2016
Short-term Debt [Abstract]
Short-Term Borrowings	Short-Term Borrowings Short-term borrowings were as follows: December 31 (In thousands) 2016 2015 Securities sold under agreements to repurchase $ 209,795 $ 254,242 FHLB advances 185,000 140,000 Total short-term borrowings $ 394,795 $ 394,242 The outstanding balances for all short-term borrowings as of December 31, 2016 and 2015 and the weighted-average interest rates as of and paid during each of the years then ended were as follows: (In thousands) Repurchase agreements FHLB Advances 2016 Ending balance $ 209,795 $ 185,000 Highest month-end balance 248,277 185,000 Average daily balance 224,763 15,694 Weighted-average interest rate: As of year-end 0.17 % 0.80 % Paid during the year 0.16 % 0.63 % 2015 Ending balance $ 254,242 $ 140,000 Highest month-end balance 278,324 140,000 Average daily balance 257,622 1,096 Weighted-average interest rate: As of year-end 0.17 % 0.56 % Paid during the year 0.18 % 0.59 % During 2015 and 2016 , outstanding FHLB advances were collateralized by investment securities owned by the Corporation’s bank subsidiary and by various loans pledged under a blanket agreement by the Corporation’s bank subsidiary. At December 31, 2016 and 2015, $25 million and $21 million , respectively, of investment securities were pledged as collateral for FHLB advances. At December 31, 2016 and 2015 , $1,909 million and $1,985 million , respectively, of commercial real estate and residential mortgage loans were pledged under a blanket agreement to the FHLB by Park’s bank subsidiary. See Note 12 - Repurchase Agreement Borrowings for information related to investment securities collateralizing repurchase agreements.

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt is listed below: December 31, 2016 2015 (In thousands) Outstanding Balance Average Rate Outstanding Balance Average Rate Total Federal Home Loan Bank advances by year of maturity: 2017 $ 50,000 1.25 % $ 50,000 1.25 % 2018 150,000 2.04 % 150,000 2.04 % 2019 75,000 1.96 % 75,000 1.96 % 2020 25,000 2.14 % 25,000 2.14 % 2021 — — % — — % Thereafter 100,000 3.40 % 150,000 3.32 % Total $ 400,000 2.27 % 450,000 2.37 % 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: 2017 350,000 1.68 % 350,000 1.68 % 2018 150,000 2.04 % 150,000 2.04 % 2019 75,000 1.96 % 75,000 1.96 % 2020 25,000 2.14 % 25,000 2.14 % 2021 — — % — — % Thereafter 100,000 3.40 % 150,000 3.32 % Total $ 700,000 2.05 % $ 750,000 2.12 % Prepayment penalty (5,719 ) — (11,895 ) — Total long-term debt $ 694,281 2.07 % $ 738,105 2.16 % 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, $4.7 million remained to be amortized as of December 31, 2016 . The remaining $4.7 million will be amortized 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, $1.0 million remained to be amortized as of December 31, 2016 . The remaining $1.0 million will be amortized in 2017. On March 30, 2015, Park prepaid $54.5 million of FHLB advances, with a weighted average rate of 1.59% , resulting in a prepayment penalty of $532,000 recognized within other expense on the Consolidated Statements of Income. On October 20, 2016, Park prepaid $50.0 million of FHLB advances, incurring a $5.6 million prepayment penalty recognized within other expense on the Consolidated Statements of Income. These advances had an interest rate of 3.15% and a maturity date of November 13, 2023. Park had approximately $100.0 million of long-term debt at December 31, 2016 with a contractual maturity longer than five years. However, all of this debt is callable by the lender in 2017. At December 31, 2016 and 2015 , FHLB advances were collateralized by investment securities owned by PNB’s banking divisions and by various loans pledged under a blanket agreement by PNB's banking divisions. At December 31, 2016 and 2015 , $25 million and $21 million , respectively, of investment securities were pledged as collateral for FHLB advances. At December 31, 2016 and 2015 , $1,909 million and $1,985 million , respectively, of commercial real estate and residential mortgage loans were pledged under a blanket agreement to the FHLB by Park's bank subsidiary. See Note 12 - Repurchase Agreement Borrowings for information related to investment securities collateralizing repurchase agreements.

Subordinated Debentures_Notes

Subordinated Debentures/Notes	12 Months Ended
	Dec. 31, 2016
Long-term Debt, Unclassified [Abstract]
Subordinated Debentures/Notes	Subordinated Notes As part of the acquisition of Vision's parent bank holding company ("Vision Parent") on March 9, 2007, Park became the successor to Vision Parent under (i) the Amended and Restated Trust Agreement of Vision Bancshares Trust I (the “Trust”), dated as of December 5, 2005, (ii) the Junior Subordinated Indenture, dated as of December 5, 2005, and (iii) the Guarantee Agreement, also dated as of December 5, 2005. On December 1, 2005, Vision Parent formed a wholly-owned Delaware statutory business trust, Vision Bancshares Trust I (“Trust I”), which issued $15.0 million of Trust I's floating rate preferred securities (the “Trust Preferred Securities”) to institutional investors. These Trust Preferred Securities qualify as Tier I capital under FRB guidelines. All of the common securities of Trust I are owned by Park. The proceeds from the issuance of the common securities and the Trust Preferred Securities were used by Trust I to purchase $15.5 million of junior subordinated notes, which carry a floating rate based on three-month LIBOR plus 148 basis points. The debentures represent the sole asset of Trust I. The Trust Preferred Securities accrue and pay distributions at a floating rate of three-month LIBOR plus 148 basis points per annum. The Trust Preferred Securities are mandatorily redeemable upon maturity of the notes in December 2035, or upon earlier redemption as provided in the notes. Park has the right to redeem the notes purchased by Trust I in whole or in part, on or after December 30, 2010. As specified in the indenture, if the notes are redeemed prior to maturity, the redemption price will be the principal amount, plus any unpaid accrued interest. In accordance with GAAP, Trust I is not consolidated with Park’s financial statements, but rather the subordinated notes are reflected as a liability. On December 23, 2009, Park entered into a Note Purchase Agreement, dated December 23, 2009, with 38 purchasers (the “2009 Purchasers”). Under the terms of the Note Purchase Agreement, the 2009 Purchasers purchased from Park an aggregate principal amount of $35.25 million of 10% Subordinated Notes due December 23, 2019 (the “2009 Notes”). The 2009 Notes were intended to qualify as Tier 2 capital under applicable rules and regulations of the FRB. The 2009 Notes could not be prepaid in any amount prior to December 23, 2014; however, subsequent to that date, Park could prepay, without penalty, all or a portion of the principal amount outstanding. Of the $35.25 million in 2009 Notes, $14.05 million were purchased by related parties. The 2009 Notes were prepaid in full on December 24, 2014, together with accrued interest. On April 20, 2012, Park entered into a Note Purchase Agreement, dated April 20, 2012 (the “2012 Purchase Agreement”), with 56 purchasers (the "2012 Purchasers"). Under the terms of the 2012 Purchase Agreement, the 2012 Purchasers purchased from Park an aggregate principal amount of $30 million of 7% Subordinated Notes due April 20, 2022 (the "2012 Notes"). The 2012 Notes are intended to qualify as Tier 2 capital under applicable rules and regulations of the FRB. Each 2012 Note was purchased at a purchase price of 100% of the principal amount thereof. The 2012 Notes may not be prepaid by Park prior to April 20, 2017. From and after April 20, 2017, Park may prepay all or, from time to time, any part of the 2012 Notes at 100% of the principal amount (plus accrued interest) without penalty, subject to any requirement under FRB regulations to obtain prior approval from the FRB before making any prepayment.

Contingent Liabilities (Notes)

Contingent Liabilities (Notes)	12 Months Ended
	Dec. 31, 2016
Loss Contingencies [Line Items]
Commitments and Contingencies Disclosure [Text Block]	Contingent Liabilities The Company is a defendant in lawsuits and other adversary proceedings arising in the ordinary course of business. Legal costs incurred in connection with the resolution of claims and lawsuits are generally expensed as incurred, and the Company establishes accruals for the outcome of litigation where losses are deemed probable and reasonably estimable. The Company’s assessment of the current exposure could change in the event of the discovery of additional facts with respect to legal matters pending against the Company or determinations by judges, juries, administrative agencies or other finders of fact that are not in accordance with the Company’s evaluation of claims. As of December 31, 2016, the Company had accrued charges of approximately $2.3 million for legal contingencies related to various legal and other adversary proceedings.

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Option Plan	Share-Based Compensation The Park National Corporation 2013 Long-Term Incentive Plan (the "2013 Incentive Plan") was adopted by the Board of Directors of Park on January 28, 2013 and was approved by Park's shareholders at the Annual Meeting of Shareholders on April 22, 2013. The 2013 Incentive Plan makes equity-based awards and cash-based awards available for grant to participants in the form of incentive stock options, nonqualified stock options, stock appreciation rights, restricted common shares, restricted stock unit awards that may be settled in common shares, cash or a combination of the two, unrestricted common shares and cash-based awards. Under the 2013 Incentive Plan, 600,000 common shares are authorized to be issued and delivered in connection with grants under the 2013 Incentive Plan. The common shares to be issued and delivered under the 2013 Incentive Plan may consist of either common shares currently held or common shares subsequently acquired by Park as treasury shares, including common shares purchased in the open market or in private transactions. No awards may be made under the 2013 Incentive Plan after April 22, 2023. At December 31, 2016, 473,725 common shares were available for future grants under the 2013 Incentive Plan. During 2016, 2015, and 2014, Park granted 9,950 , 10,150 , and 10,200 common shares, respectively, to directors of Park and to directors of Park's bank subsidiary PNB (and its divisions) under the 2013 Incentive Plan. The common shares granted to directors were not subjected to a vesting period and resulted in expense of $950,000 , $963,000 , and $801,000 in 2016, 2015, and 2014, respectively, which is included in Professional fees and services on the Consolidated Statements of Income. During 2016, 2015 and 2014, the Compensation Committee of the Board of Directors of Park granted awards of an aggregate of 41,550 , 23,025 and 21,975 , respectively, performance based restricted stock units ("PBRSUs") to certain employees of Park and its subsidiaries. The number of PBRSUs earned or settled will depend on certain performance conditions and are also subject to service based vesting. None of the PBRSUs had vested as of December 31, 2016. As of December 31, 2016, an aggregate of 1,125 PBRSUs had been forfeited. A summary of changes in Park's nonvested shares for the year ended December 31, 2016 follows: Shares Nonvested at January 1, 2016 44,700 Granted 41,550 Vested — Forfeited 825 Nonvested at December 31, 2016 85,425 Share-based compensation expense of $1.9 million , $865,000 and $458,000 was recognized for the years ended December 31, 2016 , 2015 and 2014, respectively, related to PBRSU awards to employees. The following table details expected additional share-based compensation expense related to PBRSUs currently outstanding: (In thousands) 2017 $ 1,193 2018 1,072 2019 491 2020 83 Total $ 2,839

Benefit Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2016
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Benefit Plans	Benefit Plans The Corporation has a noncontributory Defined Benefit Pension Plan (the “Pension Plan”) covering substantially all of the employees of the Corporation and its subsidiaries. The Pension Plan provides benefits based on an employee’s years of service and compensation. There were no pension contributions in 2015 or 2016 and there is no contribution expected to be made in 2017. Using an accrual measurement date of December 31, 2016 and 2015 , plan assets and benefit obligation activity for the Pension Plan are listed below: (In thousands) 2016 2015 Change in fair value of plan assets Fair value at beginning of measurement period $ 153,498 $ 160,598 Actual return on plan assets 19,256 (58 ) Benefits paid (5,707 ) (7,042 ) Fair value at end of measurement period $ 167,047 $ 153,498 Change in benefit obligation Projected benefit obligation at beginning of measurement period $ 102,245 $ 109,328 Service cost 5,055 5,368 Interest cost 4,869 4,695 Actuarial loss (gains) 7,993 (10,104 ) Benefits paid (5,707 ) (7,042 ) Projected benefit obligation at the end of measurement period $ 114,455 $ 102,245 Funded status at end of year (fair value of plan assets less benefit obligation) $ 52,592 $ 51,253 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 2016 2015 Equity securities 50% - 100% 84 % 85 % Fixed income and cash equivalents remaining balance 16 % 15 % Total 100 % 100 % The investment policy, as established by the Retirement Plan Committee, is to invest assets according to the target allocation stated above. Assets will be reallocated periodically based on the investment strategy of the Retirement Plan Committee. The investment policy is reviewed periodically. The expected long-term rate of return on plan assets used to measure the benefit obligation was 7.00% as of December 31, 2016 and 7.25% as of December 31, 2015. 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 $97.2 million and $86.1 million at December 31, 2016 and 2015 , 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, 2016 and 2015 , the fair value of the 115,800 common shares held by the Pension Plan was $13.9 million , or $119.66 per share and $10.5 million , or $90.48 per share, respectively. The weighted average assumptions used to determine benefit obligations at December 31, 2016 , 2015 and 2014 were as follows: 2016 2015 2014 Discount rate 4.58 % 4.88 % 4.42 % Rate of compensation increase Under age 30 10.00 % 10.00 % 10.00 % Ages 30-39 6.00 % 6.00 % 6.00 % Ages 40-49 4.00 % 3.00 % 3.00 % Ages 50 and over 3.00 % 3.00 % 3.00 % The estimated future pension benefit payments reflecting expected future service for the next ten years are shown below (in thousands): 2017 $ 6,924 2018 7,644 2019 7,875 2020 8,393 2021 9,503 2022-2026 48,058 Total $ 88,397 The following table shows ending balances of accumulated other comprehensive loss at December 31, 2016 and 2015. (In thousands) 2016 2015 Prior service cost $ — $ — Net actuarial loss (22,677 ) (23,618 ) Total (22,677 ) (23,618 ) Deferred taxes 7,937 8,267 Accumulated other comprehensive loss $ (14,740 ) $ (15,351 ) Using an actuarial measurement date of December 31 for 2016 , 2015 and 2014 , components of net periodic benefit income and other amounts recognized in other comprehensive income (loss) were as follows: (In thousands) 2016 2015 2014 Components of net periodic benefit income and other amounts recognized in other comprehensive income Service cost $ (5,055 ) $ (5,368 ) $ (4,331 ) Interest cost (4,869 ) (4,695 ) (4,577 ) Expected return on plan assets 10,950 11,420 10,869 Amortization of prior service cost — (15 ) (19 ) Recognized net actuarial loss (773 ) (637 ) — Net periodic benefit income $ 253 $ 705 $ 1,942 Change to net actuarial gain (loss) for the period $ 168 $ (1,400 ) $ (14,276 ) Amortization of prior service cost — 15 19 Amortization of net loss 773 637 — Total recognized in other comprehensive income (loss) 941 (748 ) (14,257 ) Total recognized in net benefit income and other comprehensive income (loss) $ 1,194 $ (43 ) $ (12,315 ) There are no estimated prior service costs for the Pension Plan to be amortized from accumulated other comprehensive income (loss) into net periodic benefit cost over the next fiscal year. The estimated net actuarial loss expected to be recognized in the next fiscal year is $576,000 . The weighted average assumptions used to determine net periodic benefit cost for the years ended December 31, 2016 , 2015 and 2014 are listed below: 2016 2015 2014 Discount Rate 4.88 % 4.42 % 5.30 % Rate of compensation increase Under age 30 10.00 % 10.00 % 10.00 % Ages 30-39 6.00 % 6.00 % 6.00 % Ages 40 and over 3.00 % 3.00 % 3.00 % Expected long-term return on plan assets 7.25 % 7.25 % 7.25 % The Pension Plan maintains cash in a PNB savings account. The Pension Plan cash balance was $2.5 million at December 31, 2016 . 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, 2016 was $167.0 million . At December 31, 2016 , $149.2 million of equity investments and cash in the Pension Plan were categorized as Level 1 inputs; $17.8 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 $153.5 million at December 31, 2015 . At December 31, 2015 , $135.0 million of investments in the Pension Plan were categorized as Level 1 inputs; $18.5 million were categorized as Level 2; and no investments were categorized as Level 3. The Corporation has a voluntary salary deferral plan covering substantially all of the employees of the Corporation and its subsidiaries. Eligible employees may contribute a portion of their compensation subject to a maximum statutory limitation. The Corporation provides a matching contribution established annually by the Corporation. Contribution expense for the Corporation was $1.3 million , $1.2 million , and $1.1 million for 2016 , 2015 and 2014 , respectively. The Corporation has entered into Supplemental Executive Retirement Plan Agreements (the "SERP Agreements") with certain key officers of the Corporation and its subsidiaries which provide defined pension benefits in excess of limits imposed by federal tax law. The accrued benefit cost for the SERP Agreements totaled $8.8 million and $8.0 million for 2016 and 2015 , respectively. The expense for the Corporation was $1.5 million for 2016 , $1.1 million for 2015 and $1.5 million for 2014 .

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2016
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) 2016 2015 Deferred tax assets: Allowance for loan losses $ 17,719 $ 19,773 Accumulated other comprehensive loss – Pension plan 7,937 8,266 Accumulated other comprehensive loss – Unrealized losses on securities 1,618 157 Deferred compensation 4,140 3,908 OREO valuation adjustments 2,322 2,418 Net deferred loan fees 1,397 1,204 Deferred contract bonus 1,074 1,031 Nonvested equity-based compensation 1,115 463 Fixed assets 781 413 Accrued litigation 793 482 Other 2,525 2,813 Total deferred tax assets $ 41,421 $ 40,928 Deferred tax liabilities: Deferred investment income 10,199 10,199 Pension plan 26,344 26,205 Mortgage servicing rights 3,243 3,153 Partnership adjustments 549 560 Other 596 872 Total deferred tax liabilities $ 40,931 $ 40,989 Net deferred tax asset (liability) $ 490 $ (61 ) 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, 2016 or 2015 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) 2016 2015 2014 Currently payable Federal $ 28,879 $ 26,153 $ 27,062 Amortization of qualified affordable housing projects 7,300 6,664 6,869 Deferred Federal 581 (250 ) 2,528 Total $ 36,760 $ 32,567 $ 36,459 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, 2016 , 2015 and 2014 . 2016 2015 2014 Statutory federal corporate tax rate 35.0 % 35.0 % 35.0 % Changes in rates resulting from: Tax exempt interest income, net of disallowed interest (1.3 )% (0.5 )% (0.5 )% Bank owned life insurance (1.2 )% (1.8 )% (1.4 )% Investments in qualified affordable housing projects, net of tax benefits (1.7 )% (1.9 )% (1.6 )% Other tax credits — % (0.9 )% — % KSOP dividend deduction (1.0 )% (1.0 )% (1.0 )% Other 0.1 % (0.2 )% (0.2 )% Effective tax rate 29.9 % 28.7 % 30.3 % 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 "State tax expense" 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) 2016 2015 2014 January 1 Balance $ 558 $ 532 $ 518 Additions based on tax positions related to the current year 117 80 76 Additions for tax positions of prior years 38 16 14 Reductions for tax positions of prior years — — — Reductions due to statute of limitations (80 ) (70 ) (76 ) December 31 Balance $ 633 $ 558 $ 532 The amount of unrecognized tax benefits that, if recognized, would favorably affect the effective income tax rate in the future periods at December 31, 2016 , 2015 and 2014 was $482,000 , $432,000 and $413,000 , respectively. Park does not expect the total amount of unrecognized tax benefits to significantly increase or decrease during the next year. The expense related to interest and penalties recorded on unrecognized tax benefits in the Consolidated Statements of Income for the years ended December 31, 2016 , and 2015 was $1,500 and $2,000 , respectively. There was no expense related to interest and penalties for the year ended December 31, 2014 . The amount accrued for interest and penalties at December 31, 2016 , 2015 and 2014 was $70,500 , $69,000 and $67,000 , respectively. Park and its subsidiaries are subject to U.S. federal income tax and income tax in various state jurisdictions. The Corporation is subject to routine audits of tax returns by the Internal Revenue Service and states in which we conduct business. No material adjustments have been made on closed federal and state tax audits. All tax years ending prior to December 31, 2013 are closed to examination by the federal taxing authorities. Generally, all tax years prior to December 31, 2012 are closed to examination by state taxing authorities.

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2016
Other Comprehensive Income (Loss) [Abstract]
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss) Other comprehensive income (loss) components, net of income tax, are shown in the following table for the years ended December 31, 2016 , 2015 and 2014 . Year ended December 31, (in thousands) Changes in Pension Plan assets and benefit obligations Unrealized gains and losses on available-for-sale securities Total Beginning balance at January 1, 2016 $ (15,351 ) $ (292 ) $ (15,643 ) Other comprehensive gain (loss) before reclassifications 109 (2,713 ) (2,604 ) Amounts reclassified from accumulated other comprehensive loss 502 — 502 Net current period other comprehensive income (loss) 611 (2,713 ) (2,102 ) Ending balance at December 31, 2016 $ (14,740 ) $ (3,005 ) $ (17,745 ) Beginning balance at January 1, 2015 $ (14,865 ) $ 1,257 $ (13,608 ) Other comprehensive loss before reclassifications (910 ) (1,549 ) (2,459 ) Amounts reclassified from accumulated other comprehensive loss 424 — 424 Net current period other comprehensive loss (486 ) (1,549 ) (2,035 ) Ending balance at December 31, 2015 $ (15,351 ) $ (292 ) $ (15,643 ) Beginning balance at January 1, 2014 $ (5,598 ) $ (29,821 ) $ (35,419 ) Other comprehensive (loss) gain before reclassifications (9,279 ) 30,325 21,046 Amounts reclassified from accumulated other comprehensive loss 12 753 765 Net current period other comprehensive (loss) income (9,267 ) 31,078 21,811 Ending balance at December 31, 2014 $ (14,865 ) $ 1,257 $ (13,608 ) The following table provides information concerning amounts reclassified out of accumulated other comprehensive loss for the years ended December 31, 2016 , 2015 and 2014 : Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Affected Line Item in the Consolidated Statement of Income (In thousands) 2016 2015 2014 Amortization of defined benefit pension items Amortization of prior service cost $ — $ 15 $ 19 Employee benefits Amortization of net loss 773 637 — Employee benefits Income before income taxes 773 652 19 Income before income taxes Federal income taxes 271 228 7 Federal income taxes Net of income tax $ 502 $ 424 $ 12 Net of income tax Unrealized gains & losses on available for sale securities Loss on sale of investment securities $ — $ — $ 1,158 Gain (loss) on sale of investment securities Other than temporary impairment — — — Miscellaneous expense Income before income taxes — — 1,158 Income before income taxes Federal income taxes — — 405 Federal income taxes Net of income tax $ — $ — $ 753 Net of income tax

Earnings Per Common Share

Earnings Per Common Share	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share GAAP requires the reporting of basic and diluted earnings per common share. Basic earnings per common share excludes any dilutive effects of restricted stock units. The following table sets forth the computation of basic and diluted earnings per common share: Year ended December 31 2016 2015 2014 Numerator: Net income available to common shareholders $ 86,135 $ 81,012 $ 83,957 Denominator: Weighted-average common shares outstanding 15,332,553 15,364,281 15,394,971 Effect of dilutive performance-based restricted stock units 72,607 40,459 18,861 Weighted-average common shares outstanding adjusted for the effect of dilutive performance-based restricted stock units 15,405,160 15,404,740 15,413,832 Earnings per common share: Basic earnings per common share $ 5.62 $ 5.27 $ 5.45 Diluted earnings per common share $ 5.59 $ 5.26 $ 5.45 Park awarded 41,550 , 23,025 and 21,975 PBRSUs to certain employees during the years ended December 31, 2016, 2015 and 2014, respectively. The PBRSUs vest based on service and performance conditions. The dilutive effect of the PBRSUs was the addition of 72,607 , 40,459 and 18,861 common shares for the years ended December 31, 2016, 2015 and 2014, respectively. During the years ended December 31, 2015 and 2014, Park repurchased 71,700 and 29,700 common shares, respectively, to fund the PBRSUs and common shares awarded to directors of Park and to directors of Park's subsidiary PNB (and its divisions). No common shares were repurchased during 2016.

Dividend Restrictions

Dividend Restrictions	12 Months Ended
	Dec. 31, 2016
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, 2016 , approximately $71.7 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, 2016
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) 2016 2015 Loan commitments $ 912,007 $ 888,411 Standby letters of credit 13,746 12,326 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, 2016
Transfers and Servicing of Financial Assets [Abstract]
Loan Servicing	Loan Servicing Park serviced sold mortgage loans of $1,330 million at December 31, 2016 , compared to $1,276 million at December 31, 2015 and $1,265 million at December 31, 2014 . At December 31, 2016 , $4.1 million of the sold mortgage loans were sold with recourse compared to $5.4 million at December 31, 2015 and $7.0 million at December 31, 2014 . Management closely monitors the delinquency rates on the mortgage loans sold with recourse. As of December 31, 2016 and 2015, management had established a reserve of $266,000 and $454,000 , respectively, to account for future loan repurchases. When Park sells mortgage loans with servicing rights retained, servicing rights are initially recorded at fair value. Park selected the “amortization method” as permissible within U.S. GAAP, whereby the servicing rights capitalized are amortized in proportion to and over the period of estimated future servicing income of the underlying loan. At the end of each reporting period, the carrying value of mortgage servicing rights (“MSRs”) is assessed for impairment with a comparison to fair value. MSRs are carried at the lower of their amortized cost or fair value. The amortization of mortgage loan servicing rights is included within “Other service income” in the Consolidated Statements of Income. Activity for mortgage servicing rights and the related valuation allowance follows: December 31 (In thousands) 2016 2015 2014 Mortgage servicing rights: Carrying amount, net, beginning of year $ 9,008 $ 8,613 $ 9,013 Additions 2,286 1,748 1,026 Amortization (1,835 ) (1,637 ) (1,631 ) Change in valuation allowance (193 ) 284 205 Carrying amount, net, end of year $ 9,266 $ 9,008 $ 8,613 Valuation allowance: Beginning of year $ 542 $ 826 $ 1,031 Change in valuation allowance 193 (284 ) (205 ) End of year $ 735 $ 542 $ 826 The fair value of mortgage servicing rights was $9.3 million and $9.6 million at December 31, 2016 and 2015, respectively. The fair value of mortgage servicing rights at December 31, 2016 was established using a discount rate of 13% and constant prepayment speeds ranging from 6.2% to 16.8% . The fair value of mortgage servicing rights at December 31, 2015 was established using a discount rate of 10% and constant prepayment speeds ranging from 6.3% to 22.0% . Servicing fees included in other service income were $3.4 million , $3.4 million and $3.5 million for the years ended December 31, 2016, 2015 and 2014, respectively.

Fair Values

Fair Values	12 Months Ended
	Dec. 31, 2016
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, 2016 using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2016 Assets Investment securities: Obligations of U.S. Treasury and other U.S. Government sponsored entities $ — $ 267,533 $ — $ 267,533 U.S. Government sponsored entities’ asset-backed securities — 987,172 — 987,172 Equity securities 2,644 — 790 3,434 Mortgage loans held for sale — 10,413 — 10,413 Mortgage IRLCs — 124 — 124 Liabilities Fair value swap $ — $ — $ 226 $ 226 Fair Value Measurements at December 31, 2015 using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2015 Assets Investment securities: Obligations of U.S. Treasury and other U.S. Government sponsored entities $ — $ 522,063 $ — $ 522,063 U.S. Government sponsored entities’ asset-backed securities — 911,493 — 911,493 Equity securities 1,941 — 769 2,710 Mortgage loans held for sale — 7,306 — 7,306 Mortgage IRLCs — 165 — 165 Liabilities Fair value swap $ — $ — $ 226 $ 226 There were no transfers between Level 1 and Level 2 during 2016 or 2015 . Management’s policy is to transfer assets or liabilities from one level to another when the methodology to obtain the fair value changes such that there are more or fewer unobservable inputs as of the end of the reporting period. The following methods and assumptions were used by the Company in determining fair value of the financial assets and liabilities discussed above: Investment securities: Fair values for investment securities are based on quoted market prices, where available. If quoted market prices are not available, fair values are based on quoted market prices of comparable instruments. For securities where quoted prices or market prices of similar securities are not available, fair values are calculated using discounted cash flows. Fair value swap: The fair value of the swap agreement entered into with the purchaser of the Visa Class B shares represents an internally developed estimate of the exposure based upon probability-weighted potential Visa litigation losses. Mortgage Interest Rate Lock Commitments (IRLCs): IRLCs are based on current secondary market pricing and are classified as Level 2. Mortgage loans held for sale: Mortgage loans held for sale are carried at their fair value. Mortgage loans held for sale are estimated using security prices for similar product types and, therefore, are classified in Level 2. The table below is a reconciliation of the beginning and ending balances of the Level 3 inputs for the years ended December 31, 2016 and 2015 , 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, 2016 $ 769 $ (226 ) Total Gains (Losses) Included in earnings - realized — — Included in earnings - unrealized — — Included in other comprehensive income 21 — Purchases, sales, issuances and settlements, other, net — — Re-evaluation of fair value swap — — Balance at December 31, 2016 $ 790 $ (226 ) Balance at January 1, 2015 $ 776 $ (226 ) Total Gains (Losses) Included in earnings - realized — — Included in earnings - unrealized — — Included in other comprehensive income (7 ) — Purchases, sales, issuances and settlements, other, net — — Re-evaluation of fair value swap — — Balance at December 31, 2015 $ 769 $ (226 ) Assets and liabilities measured at fair value on a nonrecurring basis: The following methods and assumptions were used by the Company in determining the fair value of assets and liabilities measured at fair value on a nonrecurring basis described below: Impaired Loans: At the time a loan is considered impaired, it is valued at the lower of cost or fair value. Impaired loans carried at fair value have been partially charged off or receive specific allocations of the allowance for loan losses. For collateral dependent loans, fair value is generally based on real estate appraisals. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available. Such adjustments result in a Level 3 classification of the inputs for determining fair value. Collateral is then adjusted or discounted based on management’s historical knowledge, changes in market conditions from the time of the valuation, and management’s expertise and knowledge of the client and client’s business, also resulting in a Level 3 fair value classification. Impaired loans are evaluated on a quarterly basis for additional impairment and adjusted accordingly. Additionally, updated independent 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. Fair Value Measurements at December 31, 2016 Using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2016 Impaired Loans: Commercial real estate $ — $ — $ 3,057 $ 3,057 Construction real estate — — 541 541 Residential real estate — — 2,385 2,385 Total impaired loans $ — $ — $ 5,983 $ 5,983 Mortgage Servicing Rights $ — $ 6,769 $ — $ 6,769 Other Real Estate Owned: Commercial real estate — — 2,644 2,644 Construction real estate — — 3,322 3,322 Residential real estate — — 931 931 Total Other Real Estate Owned $ — $ — $ 6,897 $ 6,897 Fair Value Measurements at December 31, 2015 Using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2015 Impaired Loans: Commercial real estate $ — $ — $ 3,698 $ 3,698 Construction real estate: SEPH commercial land and development — — 2,044 2,044 Remaining commercial — — 1,872 1,872 Residential real estate — — 1,882 1,882 Total impaired loans $ — $ — $ 9,496 $ 9,496 Mortgage Servicing Rights $ — $ 1,867 $ — $ 1,867 Other Real Estate Owned: Commercial real estate — — 2,796 2,796 Construction real estate — — 3,387 3,387 Residential real estate — — 2,332 2,332 Total Other Real Estate Owned $ — $ — $ 8,515 $ 8,515 The table below provides additional detail on those impaired loans which are recorded at fair value as well as the remaining impaired loan portfolio not included above. The remaining impaired loans consist of loans which are not collateral dependent as well as loans carried at cost as the fair value of the underlying collateral or the present value of expected future cash flows on each of the loans exceeded the book value for each respective credit. December 31, 2016 (In thousands) Recorded Investment Prior Charge-Offs Specific Valuation Allowance Carrying Balance Impaired loans recorded at fair value $ 6,379 $ 3,681 $ 396 $ 5,983 Remaining impaired loans 64,047 21,262 152 63,895 Total impaired loans $ 70,426 $ 24,943 $ 548 $ 69,878 December 31, 2015 (In thousands) Recorded Investment Prior Charge-Offs Specific Valuation Allowance Carrying Balance Impaired loans recorded at fair value $ 11,783 $ 10,512 $ 2,287 $ 9,496 Remaining impaired loans 68,881 18,193 1,904 66,977 Total impaired loans $ 80,664 $ 28,705 $ 4,191 $ 76,473 The income (expense) from credit adjustments related to impaired loans carried at fair value for the years ended December 31, 2016 , 2015 and 2014 was $0.9 million , $(2.1) million , and $(3.0) million , respectively. MSRs totaled $9.3 million at December 31, 2016 . Of this $9.3 million MSR carrying balance, $6.8 million was recorded at fair value and included a valuation allowance of $0.7 million . The remaining $2.5 million was recorded at cost, as the fair value exceeded cost at December 31, 2016 . At December 31, 2015 , MSRs totaled $9.0 million . Of this $9.0 million MSR carrying balance, $1.9 million was recorded at fair value and included a valuation allowance of $0.5 million . T he remaining $7.1 million was recorded at cost, as the fair value exceeded cost at December 31, 2015 . The (expense) income related to MSRs carried at fair value for the years ended December 31, 2016 , 2015 and 2014 was $(0.2) million , $0.3 million and $0.2 million , respectively. Total OREO held by Park at December 31, 2016 and 2015 was $13.9 million and $18.7 million , respectively. Approximately 50% and 46% of OREO held by Park at December 31, 2016 and 2015 , respectively, was carried at fair value due to fair value adjustments made subsequent to the initial OREO measurement. At December 31, 2016 and 2015 , OREO held at fair value, less estimated selling costs, amounted to $6.9 million and $8.5 million , respectively. The net expense related to OREO fair value adjustments was $0.6 million , $1.6 million and $2.4 million for the years ended December 31, 2016 , 2015 and 2014 , respectively. The following tables present quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a non-recurring basis at December 31, 2016 and December 31, 2015 : December 31, 2016 (In thousands) Fair Value Valuation Technique Unobservable Input(s) Range (Weighted Average) Impaired loans: Commercial real estate $ 3,057 Sales comparison approach Adj to comparables 0.0% - 90.0% (20.2%) Income approach Capitalization rate 9.0% - 10.6% (10.1%) Cost approach Accumulated depreciation 17.0% - 18.0% (17.8%) Construction real estate $ 541 Sales comparison approach Adj to comparables 0.0% - 11.1% (1.6%) Bulk sale approach Discount rate 10.0% (10.0%) Residential real estate $ 2,385 Sales comparison approach Adj to comparables 0.3% - 110.0% (17.0%) Income approach Capitalization rate 10.0% (10.0%) Other real estate owned: Commercial real estate $ 2,644 Sales comparison approach Adj to comparables 0.0% - 68.4% (26.5%) Income approach Capitalization rate 13.0% - 14.0% (13.1%) Construction real estate $ 3,322 Sales comparison approach Adj to comparables 0.0% - 90.0% (24.7%) Bulk sale approach Discount rate 15.0% (15.0%) Residential real estate $ 931 Sales comparison approach Adj to comparables 3.2% - 79.7% (30.6%) December 31, 2015 (In thousands) Fair Value Valuation Technique Unobservable Input(s) Range (Weighted Average) Impaired loans: Commercial real estate $ 3,698 Sales comparison approach Adj to comparables 0.0% - 45.9% (20.3%) Income approach Capitalization rate 7.0% - 13.3% (9.5%) Cost approach Accumulated depreciation 50.0% (50.0%) Construction real estate: SEPH commercial land and development $ 2,044 Sales comparison approach Adj to comparables 5.0% - 40.0% (22.1%) Bulk sale approach Discount rate 10.7% (10.7%) Remaining commercial $ 1,872 Sales comparison approach Adj to comparables 0.0% - 25.3% (1.0%) Bulk sale approach Discount rate 10.0% - 10.7% (10.0%) Residential real estate $ 1,882 Sales comparison approach Adj to comparables 0.0% - 96.7% (12.5%) Income approach Capitalization rate 3.8% - 10.1% (9.1%) Cost approach Accumulated depreciation 33.3% - 50.0% (43.4%) Other real estate owned: Commercial real estate $ 2,796 Sales comparison approach Adj to comparables 2.0% - 71.0% (26.9%) Income approach Capitalization rate 9.5% (9.5%) Construction real estate $ 3,387 Sales comparison approach Adj to comparables 0.0% - 85.0% (24.3%) Bulk sale approach Discount rate 15.0% (15.0%) Residential real estate $ 2,332 Sales comparison approach Adj to comparables 0.1% - 61.8% (23.0%) 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. Other investments: FHLB stock and FRB stock within other investments are carried at their respective redemption values as it is not practical to calculate their fair values. Additional investments within this category are carried at their cost basis as these investments do not have a readily determinable fair value and Park does not have the ability to influence the operating or financial decisions of the investee. 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, 2016 and December 31, 2015 , was as follows: December 31, 2016 Fair Value Measurements (In thousands) Carrying value Level 1 Level 2 Level 3 Total fair value Financial assets: Cash and money market instruments $ 146,466 $ 146,466 $ — $ — $ 146,466 Investment securities 1,517,972 2,644 1,511,377 790 1,514,811 Accrued interest receivable - securities 3,849 — 3,849 — 3,849 Accrued interest receivable - loans 14,973 — — 14,973 14,973 Mortgage loans held for sale 10,413 — 10,413 — 10,413 Impaired loans carried at fair value 5,983 — — 5,983 5,983 Mortgage IRLCs 124 — 124 — 124 Other loans 5,204,713 — — 5,161,919 5,161,919 Loans receivable, net $ 5,221,233 $ — $ 10,537 $ 5,167,902 $ 5,178,439 Financial liabilities: Non-interest bearing checking accounts $ 1,523,417 $ 1,523,417 $ — $ — $ 1,523,417 Interest bearing transaction accounts 1,174,448 1,174,448 — — 1,174,448 Savings accounts 1,704,920 1,704,920 — — 1,704,920 Time deposits 1,117,870 — 1,122,598 — 1,122,598 Other 1,301 1,301 — — 1,301 Total deposits $ 5,521,956 $ 4,404,086 $ 1,122,598 $ — $ 5,526,684 Short-term borrowings $ 394,795 $ — $ 394,795 $ — $ 394,795 Long-term debt 694,281 — 712,958 — 712,958 Subordinated notes 45,000 — 40,903 — 40,903 Accrued interest payable – deposits 900 82 818 — 900 Accrued interest payable – debt/borrowings 1,251 1 1,250 — 1,251 Derivative financial instruments: Fair value swap $ 226 $ — $ — $ 226 $ 226 December 31, 2015 Fair Value Measurements (In thousands) Carrying value Level 1 Level 2 Level 3 Total fair value Financial assets: Cash and money market instruments $ 149,459 $ 149,459 $ — $ — $ 149,459 Investment securities 1,585,568 1,941 1,584,984 769 1,587,694 Accrued interest receivable - securities 4,436 — 4,436 — 4,436 Accrued interest receivable - loans 14,239 — — 14,239 14,239 Mortgage loans held for sale 7,306 — 7,306 — 7,306 Impaired loans carried at fair value 9,496 — — 9,496 9,496 Mortgage IRLCs 165 — 165 — 165 Other loans 4,994,624 — — 4,997,318 4,997,318 Loans receivable, net $ 5,011,591 $ — $ 7,471 $ 5,006,814 $ 5,014,285 Financial liabilities: Non-interest bearing checking accounts $ 1,404,032 $ 1,404,032 $ — — $ 1,404,032 Interest bearing transaction accounts 1,107,200 1,107,200 — — 1,107,200 Savings accounts 1,544,708 1,544,708 — — 1,544,708 Time deposits 1,290,412 — 1,295,329 — 1,295,329 Other 1,290 1,290 — — 1,290 Total deposits $ 5,347,642 $ 4,057,230 $ 1,295,329 $ — $ 5,352,559 Short-term borrowings $ 394,242 $ — $ 394,242 $ — $ 394,242 Long-term debt 738,105 — 771,420 — 771,420 Subordinated notes 45,000 — 41,596 — 41,596 Accrued interest payable – deposits 987 66 921 — 987 Accrued interest payable – debt/borrowings 1,351 4 1,347 — 1,351 Derivative financial instruments: Fair value swap $ 226 $ — $ — $ 226 $ 226

Capital Ratios

Capital Ratios	12 Months Ended
	Dec. 31, 2016
Capital [Abstract]
Capital Ratios	Capital Ratios Financial institution regulators have established guidelines for minimum capital ratios for banks, thrifts and bank holding companies. During the first quarter of 2015, Park adopted the Basel III regulatory capital framework as approved by the federal banking agencies. The adoption of this framework modified the calculation of the various capital ratios, added an additional ratio, common equity tier 1, and revised the adequately and well capitalized thresholds. Additionally, under this framework, in order to avoid limitations on capital distributions, including dividend payments, Park must hold a capital conservation buffer above the adequately capitalized risk-based capital ratios. The capital conservation buffer is being phased in from 0.0% for 2015 to 2.50% by 2019. The capital conservation buffer was 0.625% for 2016. The amounts shown below as the adequately capitalized ratio plus capital conservation buffer includes the fully phased-in 2.50% buffer. PNB met each of the well-capitalized ratio guidelines at December 31, 2016. The following table indicates the capital ratios for PNB and Park at December 31, 2016 and 2015. As of December 31, 2016 Leverage Tier 1 Risk-Based Common Equity Tier 1 Total Risk-Based The Park National Bank 7.34 % 9.87 % 9.87 % 11.24 % Park National Corporation 9.56 % 12.83 % 12.55 % 14.32 % Adequately capitalized ratio 4.00 % 6.00 % 4.50 % 8.00 % Adequately capitalized ratio plus capital conservation buffer 4.00 % 8.50 % 7.00 % 10.50 % Well-capitalized ratio (PNB only) 5.00 % 8.00 % 6.50 % 10.00 % As of December 31, 2015 Leverage Tier 1 Risk-Based Common Equity Tier 1 Total Risk-Based The Park National Bank 7.06 % 9.83 % 9.83 % 11.37 % Park National Corporation 9.22 % 12.82 % 12.54 % 14.49 % Adequately capitalized ratio 4.00 % 6.00 % 4.50 % 8.00 % Adequately capitalized ratio plus capital conservation buffer 4.00 % 8.50 % 7.00 % 10.50 % Well-capitalized ratio (PNB only) 5.00 % 8.00 % 6.50 % 10.00 % 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, 2016 and 2015 , 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, 2016 Total Risk-Based Capital PNB $ 607,269 11.24 % $ 432,153 8.00 % $ 540,192 10.00 % Park 784,406 14.32 % 438,231 8.00 % N/A N/A Tier 1 Risk-Based Capital PNB $ 533,215 9.87 % $ 324,115 6.00 % $ 432,153 8.00 % Park 702,651 12.83 % 328,673 6.00 % N/A N/A Leverage Ratio PNB $ 533,215 7.34 % $ 290,671 4.00 % $ 363,339 5.00 % Park 702,651 9.56 % 293,916 4.00 % N/A N/A Common Equity Tier 1 PNB $ 533,215 9.87 % $ 243,086 4.50 % $ 351,125 6.50 % Park 687,651 12.55 % 246,505 4.50 % N/A N/A At December 31, 2015 Total Risk-Based Capital PNB $ 588,467 11.37 % $ 414,079 8.00 % $ 517,599 10.00 % Park 758,988 14.49 % 419,080 8.00 % N/A N/A Tier 1 Risk-Based Capital PNB $ 508,763 9.83 % $ 310,560 6.00 % $ 414,079 8.00 % Park 671,664 12.82 % 314,310 6.00 % N/A N/A Leverage Ratio PNB $ 508,763 7.06 % $ 288,147 4.00 % $ 360,183 5.00 % Park 671,664 9.22 % 291,449 4.00 % N/A N/A Common Equity Tier 1 PNB 508,763 9.83 % 232,920 4.50 % 336,439 6.50 % Park 656,664 12.54 % 235,732 4.50 % N/A N/A

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2016
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, 2016 (In thousands) PNB GFSC SEPH All Other Total Net interest income (loss) $ 227,576 $ 5,874 $ 4,774 $ (138 ) $ 238,086 Provision for (recovery of) loan losses 2,611 1,887 (9,599 ) — (5,101 ) Other income (loss) 74,803 (1 ) 2,974 955 78,731 Other expense 177,562 4,457 7,273 9,731 199,023 Income (loss) before taxes 122,206 (471 ) 10,074 (8,914 ) 122,895 Income taxes (benefit) 37,755 (164 ) 3,526 (4,357 ) 36,760 Net income (loss) $ 84,451 $ (307 ) $ 6,548 $ (4,557 ) $ 86,135 Balances at December 31, 2016 Assets $ 7,389,538 $ 32,268 $ 25,342 $ 20,438 $ 7,467,586 Loans 5,234,828 32,661 12,354 (7,986 ) 5,271,857 Deposits 5,630,199 3,809 — (112,052 ) 5,521,956 Operating results for the year ended December 31, 2015 (In thousands) PNB GFSC SEPH All Other Total Net interest income (loss) $ 220,879 $ 6,588 $ (74 ) $ 239 $ 227,632 Provision for (recovery of) loan losses 7,665 1,415 (4,090 ) — 4,990 Other income 75,188 2 1,848 513 77,551 Other expense 167,476 2,984 6,182 9,972 186,614 Income (loss) before taxes 120,926 2,191 (318 ) (9,220 ) 113,579 Income taxes (benefit) 36,581 768 (111 ) (4,671 ) 32,567 Net income (loss) $ 84,345 $ 1,423 $ (207 ) $ (4,549 ) $ 81,012 Balances at December 31, 2015 Assets $ 7,229,764 $ 35,793 $ 33,541 $ 12,256 $ 7,311,354 Loans 5,029,072 35,469 15,153 (11,609 ) 5,068,085 Deposits 5,447,293 4,627 — (104,278 ) 5,347,642 Operating results for the year ended December 31, 2014 (In thousands) PNB GFSC SEPH All Other Total Net interest income (loss) $ 218,641 $ 7,457 $ 958 $ (2,012 ) $ 225,044 Provision for (recovery of) loan losses 3,517 1,544 (12,394 ) — (7,333 ) Other income (loss) 69,384 (1 ) 5,991 175 75,549 Other expense 163,641 4,103 11,766 8,000 187,510 Income (loss) before taxes 120,867 1,809 7,577 (9,837 ) 120,416 Income taxes (benefit) 37,960 634 2,652 (4,787 ) 36,459 Net income (loss) $ 82,907 $ 1,175 $ 4,925 $ (5,050 ) $ 83,957 Balances at December 31, 2014 Assets $ 6,910,386 $ 40,308 $ 43,762 $ 6,743 $ 7,001,199 Loans 4,781,761 40,645 23,956 (16,680 ) 4,829,682 Deposits 5,222,766 5,883 — (100,649 ) 5,128,000 The following is a reconciliation of financial information for the reportable segments to the Corporation’s consolidated totals: 2016 (In thousands) Net Interest Income Depreciation Expense Other Expense Income Taxes Assets Deposits Totals for reportable segments $ 238,224 $ 8,396 $ 180,896 $ 41,117 $ 7,447,148 $ 5,634,008 Elimination of intersegment items 2,164 — — — (9,204 ) (112,052 ) Parent Co. totals - not eliminated (2,302 ) — 9,731 (4,357 ) 29,642 — Totals $ 238,086 $ 8,396 $ 190,627 $ 36,760 $ 7,467,586 $ 5,521,956 2015 (In thousands) Net Interest Income Depreciation Expense Other Expense Income Taxes Assets Deposits Totals for reportable segments $ 227,393 $ 7,347 $ 169,295 $ 37,238 $ 7,299,098 $ 5,451,920 Elimination of intersegment items 2,561 — — — (13,557 ) (104,278 ) Parent Co. totals - not eliminated (2,322 ) — 9,972 (4,671 ) 25,813 — Totals $ 227,632 $ 7,347 $ 179,267 $ 32,567 $ 7,311,354 $ 5,347,642 2014 (In thousands) Net Interest Income Depreciation Expense Other Expense Income Taxes Assets Deposits Totals for reportable segments $ 227,056 $ 7,243 $ 172,267 $ 41,246 $ 6,994,456 $ 5,228,649 Elimination of intersegment items 3,708 — — — (18,556 ) (100,649 ) Parent Co. totals - not eliminated (5,720 ) — 8,000 (4,787 ) 25,299 — Totals $ 225,044 $ 7,243 $ 180,267 $ 36,459 $ 7,001,199 $ 5,128,000

Parent Company Statements

Parent Company Statements	12 Months Ended
	Dec. 31, 2016
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. Cash represents non-interest bearing deposits with PNB. Net cash provided by operating activities reflects cash payments (received from subsidiaries) for income taxes of $4.4 million , $4.1 million and $5.8 million in 2016 , 2015 and 2014 , respectively. At December 31, 2016 and 2015 , shareholders’ equity reflected in the Parent Company balance sheet includes $259.7 million and $199.4 million , respectively, of undistributed earnings of the Corporation’s subsidiaries which are restricted from transfer as dividends to the Corporation. Balance Sheets December 31, 2016 and 2015 (In thousands) 2016 2015 Assets: Cash $ 112,067 $ 102,416 Investment in subsidiaries 626,569 613,383 Debentures receivable from PNB 25,000 25,000 Other investments 2,962 2,341 Other assets 26,651 23,443 Total assets $ 793,249 $ 766,583 Liabilities: Subordinated notes 45,000 45,000 Other liabilities 6,009 8,228 Total liabilities 51,009 53,228 Total shareholders’ equity 742,240 713,355 Total liabilities and shareholders’ equity $ 793,249 $ 766,583 Statements of Income for the years ended December 31, 2016, 2015 and 2014 (In thousands) 2016 2015 2014 Income: Dividends from subsidiaries $ 60,000 $ 60,000 $ 60,000 Interest and dividends 2,164 2,561 3,708 Other 1,081 560 262 Total income 63,245 63,121 63,970 Expense: Other, net 12,159 12,341 13,807 Total expense 12,159 12,341 13,807 Income before federal taxes and equity in undistributed income of subsidiaries 51,086 50,780 50,163 Federal income tax benefit 4,357 4,671 4,787 Income before equity in undistributed income of subsidiaries 55,443 55,451 54,950 Equity in undistributed income of subsidiaries 30,692 25,561 29,007 Net income $ 86,135 $ 81,012 $ 83,957 Other comprehensive (loss) income (1) (2,102 ) (2,035 ) 21,811 Comprehensive income 84,033 78,977 105,768 (1) See Consolidated Statements of Comprehensive Income for other comprehensive (loss) income detail Statements of Cash Flows for the years ended December 31, 2016, 2015 and 2014 (In thousands) 2016 2015 2014 Operating activities: Net income $ 86,135 $ 81,012 $ 83,957 Adjustments to reconcile net income to net cash provided by operating activities: Undistributed income of subsidiaries (30,692 ) (25,561 ) (29,007 ) Compensation expense for issuance of treasury stock to directors 950 963 801 Share-based compensation expense 1,864 865 458 Increase in other assets (3,425 ) (182 ) (1,292 ) (Decrease) increase in other liabilities (2,524 ) 485 298 Net cash provided by operating activities 52,308 57,582 55,215 Investing activities: Repayment of investments in and advances to subsidiaries 15,000 10,000 32,000 Net cash provided by investing activities 15,000 10,000 32,000 Financing activities: Cash dividends paid (57,653 ) (57,776 ) (57,876 ) Repayment of subordinated notes — — (35,250 ) Repurchase of treasury shares — (6,058 ) (2,355 ) Cash payment for fractional shares (4 ) (3 ) (5 ) Net cash used in financing activities (57,657 ) (63,837 ) (95,486 ) Increase (decrease) in cash 9,651 3,745 (8,271 ) Cash at beginning of year 102,416 98,671 106,942 Cash at end of year $ 112,067 $ 102,416 $ 98,671

Summary of Significant Accoun38

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2016
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.
Reclassifications	Reclassifications Certain prior year amounts have been reclassified to conform with the current year presentation. These reclassifications had no impact on 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 $51.6 million at December 31, 2016 and $44.2 million at December 31, 2015 . No other compensating balance arrangements were in existence at December 31, 2016 .
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 4 - Investment Securities). HTM securities are those securities that the Corporation has the positive intent and ability to hold to maturity and are recorded at amortized cost. AFS securities are those securities that would be available to be sold in the future in response to the Corporation’s liquidity needs, changes in market interest rates, and asset-liability management strategies, among other reasons. AFS securities are reported at fair value, with unrealized holding gains and losses excluded from earnings but included in other comprehensive income (loss), net of applicable income taxes. The Corporation did not hold any trading securities during any period presented. AFS and HTM securities are evaluated quarterly for potential other-than-temporary impairment. Management considers the facts related to each security including the nature of the security, the amount and duration of the loss, the credit quality of the issuer, the expectations for that security’s performance and whether Park intends to sell, or it is more likely than not that Park will be required to sell, a security in an unrealized loss position before recovery of its amortized cost basis. Declines in the value of equity securities that are considered to be other-than-temporary are recorded as a charge to earnings in the Consolidated Statements of Income. Declines in the value of debt securities that are considered to be other-than-temporary are separated into (1) the amount of the total impairment related to credit loss and (2) the amount of the total impairment related to all other factors. The amount of the total other-than-temporary impairment related to the credit loss is recognized in earnings. The amount of the total other-than-temporary impairment related to all other factors is recognized in other comprehensive income (loss), net of income tax. Interest income from investment securities includes amortization of purchase premium or discount. Premiums and discounts on securities are amortized on the level-yield method without anticipating prepayments, except for mortgage-backed securities where prepayments are anticipated. Gains and losses realized on the sale of investment securities are recorded on the trade date and determined using the specific identification basis.
Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) Stock	Federal Home Loan Bank ("FHLB") and Federal Reserve Bank ("FRB") Stock Park’s national bank subsidiary, The Park National Bank ("PNB"), is a member of the FHLB. Additionally, PNB is a member of the FRB. Members are required to own a certain amount of stock based on their level of borrowings and other factors and may invest in additional amounts. FHLB stock and FRB stock are classified as restricted securities and are carried at their redemption value within other investment securities on the Consolidated Balance Sheets. Impairment is evaluated based on the ultimate recovery of par value. Both cash and stock dividends are reported as income.
Bank Owned Life Insurance	Bank Owned Life Insurance Park has purchased insurance policies on the lives of directors and certain key officers. Bank owned life insurance is recorded at its cash surrender value (or the amount that can be realized).
Mortgage Loans Held For Sale	Loans Held for Sale Generally, loans held for sale are carried at the lower of cost or fair value. Park has elected the fair value option for mortgage loans held for sale, which are carried at their fair value as of each balance sheet date.
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 accrued on the unpaid principal balance. Net deferred loan origination fees and costs are deferred and recognized in interest income using the level-yield method without anticipating prepayments. 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 ("HELOCs"), and installment loans included in the residential real estate segment; and (3) all loans included in the consumer segment. Generally, commercial loans are placed on nonaccrual status at 90 days past due and consumer and residential mortgage loans are placed on nonaccrual status at 120 days past due. Commercial loans placed on nonaccrual status are considered impaired (see Note 5 - Loans). For loans which are on nonaccrual status, it is Park’s policy to reverse interest previously accrued on the loans against interest income. Interest on such loans may be recorded on a cash basis and be included in earnings only when Park expects to receive the entire recorded investment of the loan. Park’s charge-off policy for commercial loans requires management to establish a specific reserve or record a charge-off as soon as it is apparent that the borrower is troubled and there is, or likely will be, a collateral shortfall related to the estimated value of the collateral securing the loan. The Company’s charge-off policy for consumer loans is dependent on the class of the loan. Residential mortgage loans, HELOCs, and consumer loans secured by residential real estate are typically charged down to the value of the collateral, less estimated selling costs, at 180 days past due. The charge-off policy for other consumer loans, primarily installment loans, requires a monthly review of delinquent loans and a complete charge-off for any account that reaches 120 days past due. The delinquency status of a loan is based on contractual terms and not on how recently payments have been received. Loans may be removed from nonaccrual status when loan payments have been received to cure the delinquency status, the borrower has demonstrated the ability to maintain current payment status in accordance with the loan agreement and the loan is deemed to be well-secured by management. A description of each segment of the loan portfolio, along with the risk characteristics of each segment, is included below: Commercial, financial and agricultural: Commercial, financial and agricultural loans are made for a wide variety of general corporate purposes, including financing for commercial and industrial businesses, financing for equipment, inventories and accounts receivable, acquisition financing and commercial leasing. The term of each commercial loan varies by its purpose. Repayment terms are structured such that commercial loans will be repaid within the economic useful life of the underlying asset. The commercial loan portfolio includes loans to a wide variety of corporations and businesses across many industrial classifications originated in the 28 Ohio counties where PNB operates. The primary industries represented by these customers include manufacturing, retail trade, health care and other services. Commercial real estate: Commercial real estate (“CRE”) loans include mortgage loans to developers and owners of commercial real estate. The lending policy for CRE loans is designed to address the unique risk attributes of CRE lending. The collateral for these CRE loans is the underlying commercial real estate. Construction real estate : The Company defines construction loans as both commercial construction loans and residential construction loans where the loan proceeds are used exclusively for the improvement of real estate as to which the Company holds a mortgage. Construction loans may be in the form of a permanent loan or short-term construction loan, depending on the needs of the individual borrower. Construction financing is generally considered to involve a higher degree of risk of loss than long-term financing on improved, occupied real estate. Risk of loss on a construction loan depends largely upon the accuracy of the initial estimate of the property’s value at completion of construction and the estimated cost (including interest) of construction. If the estimate of construction cost proves to be inaccurate, the PNB division making the loan may be required to advance funds beyond the amount originally committed to permit completion of the project. If the estimate of value proves inaccurate, the PNB division may be confronted, at or prior to the maturity of the loan, with a project having a value insufficient to assure full repayment, should the borrower default. In the event that a default on a construction loan occurs and foreclosure follows, the PNB division must take control of the project and attempt to either arrange for completion of construction or dispose of the unfinished project. Additional risk exists with respect to loans made to developers who do not have a buyer for the property, as the developer may lack funds to pay the loan if the property is not sold upon completion. PNB and its divisions attempt to reduce such risks on loans to developers by requiring personal guarantees and reviewing current personal financial statements and tax returns as well as other projects undertaken by the developer. Residential real estate: The Company defines residential real estate loans as first mortgages on individuals’ primary residences or second mortgages of individuals’ primary residences in the form of HELOCs or installment loans. Credit approval for residential real estate loans requires demonstration of sufficient income to repay the principal and interest and the real estate taxes and insurance, stability of employment, an established credit record and an appraised value of the real estate securing the loan. Consumer: The Company originates direct and indirect consumer loans, primarily automobile loans, 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 ("ALLL") 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”). Included in the statistical allocation is a reserve for troubled debt restructurings ("TDRs") within the consumer loan portfolio. Management performs a periodic evaluation to ensure the reserve calculated utilizing the statistical allocation is consistent with a reserve calculated under Accounting Standards Codification ("ASC") 310-10 - Receivables . In calculating the allowance for loan losses, management believes it is appropriate to consider 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, 2016 , 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 2010 through 2016 within the individual segments of the commercial and consumer loan categories. Management believes the 84 -month historical loss experience methodology is appropriate in the current economic environment, as it captures loss rates consistent with current expectations based on current economic conditions. The loss factor applied to Park’s consumer loan portfolio as of December 31, 2016 was based on the historical loss experience over the past 84 months, plus an additional judgmental reserve, increasing the total allowance for loan loss coverage in the consumer loan portfolio to approximately 1.95 years of historical losses. The consumer loan portfolio loss coverage ratio was 1.99 years at December 31, 2015 . Historical loss experience over the past 84 months for the consumer loan portfolio was 0.34% for 2016 and 0.42% for 2015. The loss factor applied to Park’s commercial loan portfolio as of December 31, 2016 was based on the historical loss experience over the past 84 months, plus additional reserves for consideration of (1) a loss emergence period factor, (2) a loss migration factor and (3) a judgmental or environmental loss factor. These additional reserves increased the total allowance for loan loss coverage in the commercial loan portfolio to approximately 3.20 years of historical losses at December 31, 2016. The commercial loan portfolio loss coverage ratio was 2.37 years at December 31, 2015 . Historical loss experience over the past 84 months for the commercial loan portfolio was 0.39% for 2016 and 0.53% for 2015. Park’s commercial loans are individually risk graded. If loan downgrades occur, the probability of default increases and accordingly management allocates a higher percentage reserve to those accruing commercial loans graded special mention and substandard. The judgmental increases discussed above incorporate management’s evaluation of the impact of environmental qualitative factors which pose additional risks and assign a component of the allowance for loan losses in consideration of these factors. Such environmental factors include: national and local economic trends and conditions; experience, ability and depth of lending management and staff; effects of any changes in lending policies and procedures; and levels of, and trends in, consumer bankruptcies, delinquencies, impaired loans and charge-offs and recoveries. GAAP requires a specific allocation to be established as a component of the allowance for loan losses for certain loans when it is probable that all amounts due pursuant to the contractual terms of the loans will not be collected, and the recorded investment in the loans exceeds their measure of impairment. Management considers the following related to commercial loans when determining if a loan should be considered impaired : (1) current debt service coverage levels of the borrowing entity; (2) payment history over the most recent 12-month period; (3) other signs of deterioration in the borrower’s financial situation, such as changes in credit scores; and (4) consideration of global cash flows of financially sound guarantors that have previously supported loan payments. The recorded investment is the carrying balance of the loan, plus accrued interest receivable, both as of the end of the year. Impairment is measured using either the present value of expected future cash flows based upon the initial effective interest rate on the loan, or the fair value of the collateral. If a loan is considered to be collateral dependent, the fair value of collateral, less estimated selling costs, is used to measure impairment.
Troubled Debt Restructuring (TDRs)	Troubled Debt Restructuring Management classifies loans as TDRs when a borrower is experiencing financial difficulty and Park has granted a concession. In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed of the probability that the borrower will be in payment default on any of the borrower's debt in the foreseeable future without the modification. This evaluation is performed under the Company’s internal underwriting policy. Management’s policy is to modify loans by extending the term or by granting a temporary or permanent contractual interest rate below the market rate, not by forgiving debt. A court's discharge of a borrower's debt in a Chapter 7 bankruptcy is considered a concession when the borrower does not reaffirm the discharged debt. TDRs are separately identified for impairment disclosures and are measured at the present value of estimated future cash flows using the loan’s effective rate at inception. If a TDR is considered to be a collateral dependent loan, the loan is reported, net, at the fair value of the collateral.
Income Recognition	Income Recognition Income earned by the Corporation and its subsidiaries is recognized on the accrual basis of accounting, except for nonaccrual loans as previously discussed, and late charges on loans which are recognized as income when they are collected.
Premises and Equipment	Premises and Equipment Land is carried at cost and is not subject to depreciation. Premises and equipment are carried at cost, less accumulated depreciation and amortization. Depreciation is generally provided on the straight-line method over the estimated useful lives of the related assets. Leasehold improvements are amortized over the shorter of the remaining lease period or the estimated useful lives of the improvements. Upon the sale or other disposal of an asset, the cost and related accumulated depreciation are removed from the accounts and the resulting gain or loss is recognized. Maintenance and repairs are charged to expense as incurred while renewals and improvements that extend the useful life of an asset are capitalized. Premises and equipment are evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount of a particular asset may not be recoverable. The range of depreciable lives over which premises and equipment are being depreciated are: Buildings 30 Years Equipment, furniture and fixtures 3 to 12 Years Leasehold improvements 1 to 10 Years
Other Real Estate Owned (OREO)	Other Real Estate Owned ("OREO") Management transfers a loan to OREO at the time that Park takes deed/title of the asset. OREO is initially recorded at fair value less anticipated selling costs (net realizable value), establishing a new cost basis, and consists of property acquired through foreclosure and real estate held for sale. If the net realizable value is below the carrying value of the loan at the date of transfer, the difference is charged to the allowance for loan losses. These assets are subsequently accounted for at the lower of cost or fair value less costs to sell. Subsequent changes in the value of real estate are classified as OREO valuation adjustments, are reported as adjustments to the carrying amount of OREO and are recorded within “Other income”. In certain circumstances where management believes the devaluation may not be permanent in nature, Park utilizes a valuation allowance to record OREO devaluations, which is also expensed through “Other income”. Costs relating to development and improvement of such properties are capitalized (not in excess of fair value less estimated costs to sell) and costs relating to holding the properties are charged to "Other expense".
Mortgage Loan Servicing Rights	Mortgage Servicing Rights ("MSR") When Park sells mortgage loans with servicing rights retained, servicing rights are recorded at an amount not to exceed fair value with the income statement effect recorded in "Other service income." Capitalized servicing rights are amortized in proportion to and over the period of the estimated future servicing income of the underlying loan and are included within “Other service income”. Mortgage servicing rights are assessed for impairment periodically, based on fair value, with any impairment recognized through a valuation allowance. The fair value of mortgage servicing rights is determined by discounting estimated future cash flows from the servicing assets, using market discount rates and expected future prepayment rates. In order to calculate fair value, the sold loan portfolio is stratified into homogeneous pools of like categories. (See Note 24 - Loan Servicing.) Fees received for servicing mortgage loans owned by investors are based on a percentage of the outstanding monthly principal balance of such loans and are included in income as loan payments are received. The cost of servicing loans is charged to expense as incurred.
Goodwill and Other Intangible Assets	Goodwill Goodwill represents the excess of the purchase price over net identifiable tangible and intangible assets acquired in a purchase business combination. 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, 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. 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, 2016, the goodwill remaining on Park's Consolidated Balance Sheet consisted entirely of goodwill at PNB. (See Note 27 - Segment Information for operating segment results.) 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, 2016, 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. Goodwill in the amount of $72.3 million was recorded at each of December 31, 2016, 2015, and 2014.
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 to be held in treasury is recorded at cost. At the date of retirement or subsequent reissuance, the treasury shares account is reduced by the weighted average cost of the common shares retired or reissued.
Comprehensive Income	Comprehensive Income Comprehensive income consists of net income and other comprehensive income (loss). Other comprehensive income (loss) includes unrealized gains and losses on securities available for sale, and changes in the funded status of the Company’s defined benefit pension plan, which are also recognized as separate components of equity.
Stock Based Compensation	Share-Based Compensation Compensation cost is recognized for restricted stock units and stock awards issued to employees and directors, respectively, based on the fair value of these awards at the date of grant. The market price of Park’s common shares at the date of grant is used to estimate the fair value of restricted stock units and stock awards. Compensation cost is recognized over the required service period, generally defined as the vesting period and is recorded in "Salaries" expense. (See Note 17-Share-Based Compensation.)
Loan Commitments and Related Financial Instruments	Loan Commitments and Related Financial Instruments Financial instruments include off‑balance sheet credit instruments, such as commitments to make loans and commercial letters of credit, issued to meet customer financing needs. The face amount for these items represents the exposure to loss, before considering customer collateral or ability to repay. Such financial instruments are recorded when they are funded.
Fair Value Measurement	Fair Value Measurement Fair values of financial instruments are estimated using relevant market information and other assumptions, as more fully disclosed in Note 25 - Fair Value. Fair value estimates involve uncertainties and matters of significant judgment regarding interest rates, credit risk, prepayments, and other factors, especially in the absence of broad markets for particular items. Changes in assumptions or in market conditions could significantly affect the estimates.
Transfers and Financial Assets	Transfers of Financial Assets Transfers of financial assets are accounted for as sales, when control over the assets has been relinquished. Control over transferred assets is deemed to be surrendered when the assets have been isolated from the Company, the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and the Company does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity.
Retirement Plans	Retirement Plans Pension expense is the net of service and interest cost, return on plan assets and amortization of gains and losses not immediately recognized. Employee KSOP plan expense is the amount of matching contributions to Park's employees stock ownership plan. Deferred compensation and supplemental retirement plan expense allocates the benefits over years of service. (See Note 18 - Benefit Plans.)
Earnings Per Common Share	Earnings Per Common Share Basic earnings per common share is net income available to common shareholders divided by the weighted average number of common shares outstanding during the period. Diluted earnings per common share includes the dilutive effect of additional potential common shares issuable under stock awards, stock options, warrants and convertible securities. Earnings and dividends per common share are restated for any stock splits and stock dividends through the date of issuance of the consolidated financial statements. (See Note 21 - Earnings Per Common Share.)
Segment Reporting, Policy [Policy Text Block]	Operating Segments The Corporation is a financial holding company headquartered in Newark, Ohio. The operating segments for the Corporation are its chartered national bank subsidiary, PNB (headquartered in Newark, Ohio), SE Property Holdings, LLC ("SEPH"), and Guardian Financial Services Company ("GFSC").
Adoption of New Accounting Pronouncements	Adoption of New Accounting Pronouncements and Issued Not Yet Effective Accounting Standards ASU 2014-09 - Revenue from Contracts with Customers (Topic 606): In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). The ASU creates a new topic, Topic 606, to provide guidance on revenue recognition for entities that enter into contracts with customers to transfer goods or services or enter into contracts for the transfer of nonfinancial assets. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Additional disclosures are required to provide quantitative and qualitative information regarding the nature, amount, timing, and uncertainty of revenue and cash flows arising from contracts with customers. The new guidance is effective for annual reporting periods, and interim reporting periods within those annual periods, beginning after December 15, 2017. While interest income is specifically out of scope of this standard, management is currently evaluating the revenue streams within "Other income" to assess the applicability of this standard. Specifically, management is evaluating the impact of this new guidance on deposit fees recorded within "Service Charges on Deposit Accounts" and trust income within "Income from Fiduciary Activities." ASU 2015-02 - Consolidation (Topic 810): Amendments to the Consolidation Analysis : In February 2015, the FASB issued ASU 2015-02, Consolidation (Topic 810) : Amendments to the Consolidation Analysis . The ASU amends the current consolidation guidance and affect both the variable interest entity and voting interest entity consolidation models. The new guidance is effective for annual reporting periods and interim reporting periods within those annual periods, beginning after December 15, 2015. The adoption of this guidance on January 1, 2016 did not have an impact on Park’s consolidated financial statements. ASU 2016-01 - Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. In January 2016, the FASB issued ASU 2016-01 - Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. Changes to the current U.S. GAAP model primarily affect the accounting for equity investments, financial liabilities under the fair value option, and the presentation and disclosure requirements for financial instruments. In addition, the ASU clarifies guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale securities. The new guidance is effective for annual reporting periods and interim reporting periods within those annual periods, beginning after December 15, 2017. The adoption of this guidance is not expected to have a material impact on Park's consolidated financial statements. ASU 2016-02 - Leases (Topic 842): In February 2016, the FASB issued ASU 2016-02 - Leases (Topic 842) . The ASU will require all organizations that lease assets to recognize on the balance sheet the assets and liabilities for the rights and obligations created by those leases. Additional qualitative and quantitative disclosures will be required so that users can understand more about the nature of an entity’s leasing activities. The new guidance is effective for annual reporting periods and interim reporting periods within those annual periods, beginning after December 15, 2018. Early adoption is permitted. Management is currently analyzing data on leased assets. The adoption of this guidance is expected to increase both assets and liabilities, but is not expected to have a material impact on Park's consolidated statement of income. ASU 2016-09 - Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting: In March 2016, FASB issued ASU 2016-09 - Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting . The ASU provides simplification for several aspects of accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The new guidance is effective for annual reporting periods and interim reporting periods within those annual periods, beginning after December 15, 2016. Early adoption was permitted. The adoption of this guidance on January 1, 2017 did not have a material impact on Park's consolidated financial statements. ASU 2016-13 - Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments: In June 2016, FASB issued ASU 2016-13 - Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments . The new guidance replaces the incurred loss model with an expected loss model, which is referred to as the current expected credit loss ("CECL") model. The CECL model is applicable to the measurement of credit losses on financial assets measured at amortized cost, including loan receivables, HTM debt securities, and reinsurance receivables. It also applies to off-balance sheet credit exposures not accounted for as insurance (loan commitments, standby letters of credit, financial guarantees, and other similar instruments) and net investments in leases recognized by a lessor. The CECL model requires an entity to estimate the credit losses over the life of an asset or off-balance sheet exposure. The new guidance is effective for annual reporting periods and interim reporting periods within those annual periods, beginning after December 15, 2019. Early adoption is permitted for annual reporting periods and interim reporting periods within those annual periods, beginning after December 15, 2018. Management is currently evaluating the impact of the adoption of this guidance on Park's consolidated financial statements. We anticipate that the adoption of the CECL model will result in a material increase to Park's allowance for loan losses. Management has established a committee to oversee the implementation of CECL. This committee is currently assessing the data and system requirements necessary for adoption. Management plans to run our current model and a CECL model concurrently for 12 months prior to the adoption of this guidance on January 1, 2020. ASU 2016-15 - Statement of Cash Flows (Topic 203): Classification of Certain Cash Receipts and Cash Payments (a consensus of the Emerging Issues Task Force): In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 203): Classification of Certain Cash Receipts and Cash Payments (a consensus of the Emerging Issues Task Force) . This ASU provides guidance on eight specific cash flow issues where current GAAP is either unclear or does not include specific guidance. The new guidance is effective for annual reporting periods, and interim reporting periods within those annual periods, beginning after December 15, 2017. As such transactions arise, management will utilize the updated guidance within Park’s consolidated statements of cash flows. ASU 2017-04 - Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment: In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. This ASU eliminates Step 2 from the goodwill impairment test. Instead, under the new guidance, an entity should perform its annual goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An impairment charge would be recognized for the amount by which the carrying amount exceeds the reporting unit's fair value. The new guidance is effective for annual reporting periods, and interim reporting periods within those annual periods, beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The adoption of this guidance is not expected to have an impact on Park's consolidated financial statements.

Summary of Significant Accoun39

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2016
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

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Schedule of marketable securities	Investment securities at December 31, 2016 and December 31, 2015 were as follows: (In thousands) Amortized Cost Gross Unrealized/Unrecognized Holding Gains Gross Unrealized/Unrecognized Holding Losses Estimated Fair Value 2016: Securities Available-for-Sale Obligations of U.S. Treasury and other U.S. Government sponsored entities $ 270,000 $ — $ 2,467 $ 267,533 U.S. Government sponsored entities’ asset-backed securities 991,642 5,372 9,842 987,172 Other equity securities 1,119 2,315 — 3,434 Total $ 1,262,761 $ 7,687 $ 12,309 $ 1,258,139 2016: Securities Held-to-Maturity Obligations of states and political subdivisions $ 188,622 $ 977 $ 5,148 $ 184,451 U.S. Government sponsored entities’ asset-backed securities 71,211 1,097 87 72,221 Total $ 259,833 $ 2,074 $ 5,235 $ 256,672 (In thousands) Amortized Cost Gross Unrealized/Unrecognized Holding Gains Gross Unrealized/Unrecognized Holding Losses Estimated Fair Value 2015: Securities Available-for-Sale Obligations of U.S. Treasury and other U.S. Government sponsored entities $ 527,605 $ — $ 5,542 $ 522,063 U.S. Government sponsored entities’ asset-backed securities 907,989 8,776 5,272 911,493 Other equity securities 1,120 1,590 — 2,710 Total $ 1,436,714 $ 10,366 $ 10,814 $ 1,436,266 2015: Securities Held-to-Maturity Obligations of states and political subdivisions $ 48,190 $ 734 $ — $ 48,924 U.S. Government sponsored entities’ asset-backed securities 101,112 1,526 134 102,504 Total $ 149,302 $ 2,260 $ 134 $ 151,428
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, 2016 and December 31, 2015 : Less than 12 Months 12 Months or Longer Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses 2016: Securities Available-for-Sale Obligations of U.S. Treasury and other U.S. Government sponsored entities $ 247,695 $ 2,305 $ 19,838 $ 162 $ 267,533 $ 2,467 U.S. Government sponsored entities' asset-backed securities 612,321 9,473 27,325 369 639,646 9,842 Total $ 860,016 $ 11,778 $ 47,163 $ 531 $ 907,179 $ 12,309 2016: Securities Held-to-Maturity Obligations of states and political subdivisions $ 134,909 $ 5,148 $ — $ — $ 134,909 $ 5,148 U.S. Government sponsored entities’ asset-backed securities — — 7,564 87 7,564 87 Total $ 134,909 $ 5,148 $ 7,564 $ 87 $ 142,473 $ 5,235 Less than 12 Months 12 Months or Longer Total (In thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses 2015: Securities Available-for-Sale Obligations of U.S. Treasury and other U.S. Government sponsored entities $ 326,973 $ 2,117 $ 195,090 $ 3,425 $ 522,063 $ 5,542 U.S. Government sponsored entities' asset-backed securities 384,169 2,776 114,543 2,496 498,712 5,272 Total $ 711,142 $ 4,893 $ 309,633 $ 5,921 $ 1,020,775 $ 10,814 2015: Securities Held-to-Maturity U.S. Government sponsored entities' asset-backed securities $ 5,656 $ 10 $ 7,792 $ 124 $ 13,448 $ 134
Schedule of contractual maturity of debt securities	The amortized cost and estimated fair value of investments in debt securities at December 31, 2016 , are shown in the following table by contractual maturity, except for asset-backed securities, which are shown as a single total, due to the unpredictability of the timing in principal repayments. (In thousands) Amortized Cost Estimated Fair Value Tax Equivalent Yield (1) Securities Available-for-Sale U.S. Treasury and other U.S. Government sponsored entities’ notes: Due within one year $ 25,000 $ 24,933 0.87 % Due one through five years 245,000 242,600 1.22 % Total $ 270,000 $ 267,533 1.18 % U.S. Government sponsored entities’ asset-backed securities $ 991,642 $ 987,172 2.10 % Securities Held-to-Maturity Obligations of states and political subdivisions Due greater than ten years $ 188,622 $ 184,451 4.50 % Total $ 188,622 $ 184,451 4.50 % U.S. Government sponsored entities’ asset-backed securities $ 71,211 $ 72,221 3.31 %

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 and December 31, 2015 was as follows: 12/31/2016 12/31/2015 (In thousands) Loan Balance Accrued Interest Receivable Recorded Investment Loan Balance Accrued Interest Receivable Recorded Investment Commercial, financial and agricultural * $ 994,619 $ 3,558 $ 998,177 $ 955,727 $ 3,437 $ 959,164 Commercial real estate * 1,155,703 4,161 1,159,864 1,113,603 4,009 1,117,612 Construction real estate: SEPH commercial land and development — — — 2,044 — 2,044 Remaining commercial 135,343 398 135,741 128,046 321 128,367 Mortgage 48,699 106 48,805 36,722 75 36,797 Installment 4,903 17 4,920 6,533 21 6,554 Residential real estate: Commercial 406,687 940 407,627 410,571 1,014 411,585 Mortgage 1,169,495 1,459 1,170,954 1,210,819 1,469 1,212,288 HELOC 212,441 853 213,294 211,415 769 212,184 Installment 19,874 67 19,941 22,638 78 22,716 Consumer 1,120,850 3,385 1,124,235 967,111 3,032 970,143 Leases 3,243 29 3,272 2,856 14 2,870 Total loans $ 5,271,857 $ 14,973 $ 5,286,830 $ 5,068,085 $ 14,239 $ 5,082,324 * Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class.
Schedule of recorded investment in nonaccrual restructured and loans past due 90 days or more and accruing	The following table presents the recorded investment in nonaccrual loans, accruing troubled debt restructurings ("TDRs"), and loans past due 90 days or more and still accruing by class of loan as of December 31, 2016 and December 31, 2015 : 12/31/2016 (In thousands) Nonaccrual Loans Accruing Troubled Debt Restructurings Loans Past Due 90 Days or More and Accruing Total Nonperforming Loans Commercial, financial and agricultural $ 20,057 $ 600 $ 15 $ 20,672 Commercial real estate 19,169 5,305 — 24,474 Construction real estate: SEPH commercial land and development — — — — Remaining commercial 1,833 393 — 2,226 Mortgage — 104 — 104 Installment 61 95 12 168 Residential real estate: Commercial 23,013 89 — 23,102 Mortgage 18,313 9,612 887 28,812 HELOC 1,783 673 25 2,481 Installment 644 609 60 1,313 Consumer 2,949 748 1,139 4,836 Total loans $ 87,822 $ 18,228 $ 2,138 $ 108,188 12/31/2015 (In thousands) Nonaccrual Loans Accruing Troubled Debt Restructurings Loans Past Due 90 Days or More and Accruing Total Nonperforming Loans Commercial, financial and agricultural $ 21,676 $ 8,947 $ — $ 30,623 Commercial real estate 15,268 2,757 — 18,025 Construction real estate: SEPH commercial land and development 2,044 — — 2,044 Remaining commercial 4,162 514 — 4,676 Mortgage 7 110 — 117 Installment 64 114 — 178 Residential real estate: Commercial 25,063 261 — 25,324 Mortgage 20,378 10,143 851 31,372 HELOC 1,749 873 27 2,649 Installment 1,657 635 4 2,296 Consumer 3,819 734 1,093 5,646 Total loans $ 95,887 $ 25,088 $ 1,975 $ 122,950
Schedule of loans individually evaluated for impairment and loans collectively evaluated for impairment	The following table provides additional information regarding those nonaccrual and accruing TDR loans that are individually evaluated for impairment and those collectively evaluated for impairment as of December 31, 2016 and December 31, 2015 . 12/31/2016 12/31/2015 (In thousands) Nonaccrual and accruing TDRs Loans individually evaluated for impairment Loans collectively evaluated for impairment Nonaccrual and accruing TDRs Loans individually evaluated for impairment Loans collectively evaluated for impairment Commercial, financial and agricultural $ 20,657 $ 20,624 $ 33 $ 30,623 $ 30,595 $ 28 Commercial real estate 24,474 24,474 — 18,025 18,025 — Construction real estate: SEPH commercial land and development — — — 2,044 2,044 — Remaining commercial 2,226 2,226 — 4,676 4,676 — Mortgage 104 — 104 117 — 117 Installment 156 — 156 178 — 178 Residential real estate: Commercial 23,102 23,102 — 25,324 25,324 — Mortgage 27,925 — 27,925 30,521 — 30,521 HELOC 2,456 — 2,456 2,622 — 2,622 Installment 1,253 — 1,253 2,292 — 2,292 Consumer 3,697 — 3,697 4,553 — 4,553 Total loans $ 106,050 $ 70,426 $ 35,624 $ 120,975 $ 80,664 $ 40,311
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, 2016 and December 31, 2015 . 12/31/2016 12/31/2015 (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 $ 41,075 $ 19,965 $ — $ 32,583 $ 18,763 $ — Commercial real estate 23,961 23,474 — 15,138 14,916 — Construction real estate: SEPH commercial land and development — — — 10,834 2,044 — Remaining commercial 3,662 2,226 — 2,506 1,531 — Residential real estate: Commercial 24,409 22,687 — 23,798 23,480 — With an allowance recorded Commercial, financial and agricultural 810 659 152 16,155 11,832 1,904 Commercial real estate 1,014 1,000 309 3,195 3,109 381 Construction real estate: Remaining commercial — — — 3,145 3,145 1,356 Residential real estate: Commercial 427 415 87 1,951 1,844 550 Total $ 95,358 $ 70,426 $ 548 $ 109,305 $ 80,664 $ 4,191
Schedule of average recorded investment and interest income recognized on loans individually evaluated for impairment	The following tables present the average recorded investment and interest income recognized during the year subsequent to impairment on loans individually evaluated for impairment as of and for the years ended December 31, 2016 , 2015 , and 2014 : Year ended December 31, 2016 (In thousands) Recorded Investment as of December 31, 2016 Average recorded investment Interest income recognized Commercial, financial and agricultural $ 20,624 $ 26,821 $ 885 Commercial real estate 24,474 22,828 884 Construction real estate: SEPH commercial land and development — 1,597 — Remaining commercial 2,226 3,906 66 Residential real estate: Commercial 23,102 24,341 2,942 Consumer — 3 — Total $ 70,426 $ 79,496 $ 4,777 Year ended December 31, 2015 (In thousands) Recorded Investment as of December 31, 2015 Average recorded investment Interest income recognized Commercial, financial and agricultural $ 30,595 $ 20,179 $ 340 Commercial real estate 18,025 17,883 550 Construction real estate: SEPH commercial land and development 2,044 2,066 21 Remaining commercial 4,676 5,666 26 Residential real estate: Commercial 25,324 24,968 1,026 Consumer — — — Total $ 80,664 $ 70,762 $ 1,963 Year ended December 31, 2014 (In thousands) Recorded Investment as of December 31, 2014 Average recorded investment Interest income recognized Commercial, financial and agricultural $ 19,106 $ 19,518 $ 360 Commercial real estate 21,989 31,945 1,027 Construction real estate: SEPH commercial land and development 2,078 3,658 146 Remaining commercial 5,609 8,784 61 Residential real estate: Commercial 24,930 28,306 1,084 Consumer — 403 — Total $ 73,712 $ 92,614 $ 2,678
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, 2016 and December 31, 2015 by class of loan. 12/31/2016 (In thousands) Accruing loans past due 30-89 days Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) Total past due Total current (2) Total recorded investment Commercial, financial and agricultural $ 371 $ 4,113 $ 4,484 $ 993,693 $ 998,177 Commercial real estate 355 2,499 2,854 1,157,010 1,159,864 Construction real estate: SEPH commercial land and development — — — — — Remaining commercial — 541 541 135,200 135,741 Mortgage 559 — 559 48,246 48,805 Installment 223 64 287 4,633 4,920 Residential real estate: Commercial 330 3,631 3,961 403,666 407,627 Mortgage 10,854 9,769 20,623 1,150,331 1,170,954 HELOC 970 1,020 1,990 211,304 213,294 Installment 350 319 669 19,272 19,941 Consumer 12,579 2,094 14,673 1,109,562 1,124,235 Leases — — — 3,272 3,272 Total loans $ 26,591 $ 24,050 $ 50,641 $ 5,236,189 $ 5,286,830 (1) Includes an aggregate of $2.1 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans. (2) Includes an aggregate of $65.9 million of nonaccrual loans which are current in regards to contractual principal and interest payments. 12/31/2015 (In thousands) Accruing loans past due 30-89 days Past due, nonaccrual loans and loans past due 90 days or more and accruing (1) Total past due Total current (2) Total recorded investment Commercial, financial and agricultural $ 670 $ 7,536 $ 8,206 $ 950,958 $ 959,164 Commercial real estate 142 530 672 1,116,940 1,117,612 Construction real estate: SEPH commercial land and development — 2,044 2,044 — 2,044 Remaining commercial 165 84 249 128,118 128,367 Mortgage 63 7 70 36,727 36,797 Installment 200 46 246 6,308 6,554 Residential real estate: Commercial 325 19,521 19,846 391,739 411,585 Mortgage 10,569 8,735 19,304 1,192,984 1,212,288 HELOC 487 186 673 211,511 212,184 Installment 426 318 744 21,972 22,716 Consumer 11,458 3,376 14,834 955,309 970,143 Leases — — — 2,870 2,870 Total loans $ 24,505 $ 42,383 $ 66,888 $ 5,015,436 $ 5,082,324
Schedule of recorded investment by loan grade	The tables below present the recorded investment by loan grade at December 31, 2016 and December 31, 2015 for all commercial loans: 12/31/2016 (In thousands) 5 Rated 6 Rated Impaired Pass Rated Recorded Investment Commercial, financial and agricultural* $ 5,826 $ — $ 20,657 $ 971,694 $ 998,177 Commercial real estate* 7,548 190 24,474 1,127,652 1,159,864 Construction real estate: SEPH commercial land and development — — — — — Remaining commercial 287 118 2,226 133,110 135,741 Residential real estate: Commercial 1,055 124 23,102 383,346 407,627 Leases — — — 3,272 3,272 Total Commercial Loans $ 14,716 $ 432 $ 70,459 $ 2,619,074 $ 2,704,681 * Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class. 12/31/2015 (In thousands) 5 Rated 6 Rated Impaired Pass Rated Recorded Investment Commercial, financial and agricultural* $ 4,392 $ 347 $ 30,623 $ 923,802 $ 959,164 Commercial real estate* 14,880 3,417 18,025 1,081,290 1,117,612 Construction real estate: SEPH commercial land and development — — 2,044 — 2,044 Remaining commercial 2,151 122 4,676 121,418 128,367 Residential real estate: Commercial 3,280 386 25,324 382,595 411,585 Leases — — — 2,870 2,870 Total Commercial Loans $ 24,703 $ 4,272 $ 80,692 $ 2,511,975 $ 2,621,642
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, 2016 , 2015 and 2014 as well as the recorded investment of these contracts at December 31, 2016 , 2015 , and 2014. The recorded investment pre- and post-modification is generally the same due to the fact that Park does not typically forgive principal. Year ended December 31, 2016 (In thousands) Number of Contracts Accruing Nonaccrual Recorded Investment Commercial, financial and agricultural 32 $ 191 $ 8,450 $ 8,641 Commercial real estate 14 3,844 2,537 6,381 Construction real estate: SEPH commercial land and development — — — — Remaining commercial 2 — 1,143 1,143 Mortgage — — — — Installment 1 — — — Residential real estate: Commercial 11 89 1,033 1,122 Mortgage 34 114 2,292 2,406 HELOC 13 104 178 282 Installment 5 102 3 105 Consumer 293 184 994 1,178 Total loans 405 $ 4,628 $ 16,630 $ 21,258 Year ended December 31, 2015 (In thousands) Number of Contracts Accruing Nonaccrual Recorded Investment Commercial, financial and agricultural 39 $ 8,948 $ 3,640 $ 12,588 Commercial real estate 14 637 3,523 4,160 Construction real estate: SEPH commercial land and development — — — — Remaining commercial 2 513 — 513 Mortgage 1 19 — 19 Installment — — — — Residential real estate: Commercial 11 — 1,185 1,185 Mortgage 39 1,132 2,122 3,254 HELOC 26 315 45 360 Installment 9 — 155 155 Consumer 283 202 888 1,090 Total loans 424 $ 11,766 $ 11,558 $ 23,324 Year ended December 31, 2014 (In thousands) Number of Contracts Accruing Nonaccrual Recorded Investment Commercial, financial and agricultural 30 $ 292 $ 431 $ 723 Commercial real estate 11 1,184 1,254 2,438 Construction real estate: SEPH commercial land and development — — — — Remaining commercial 2 — 206 206 Mortgage — — — — Installment 2 — 56 56 Residential real estate: Commercial 9 — 866 866 Mortgage 46 32 2,325 2,357 HELOC 10 85 241 326 Installment 10 109 12 121 Consumer 330 244 1,058 1,302 Total loans 450 $ 1,946 $ 6,449 $ 8,395
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, 2016 , December 31, 2015 , and December 31, 2014. For this table, a loan is considered to be in default when it becomes 30 days contractually past due under the modified terms. The additional allowance for loan loss resulting from the defaults on TDR loans was immaterial. Year ended December 31, 2016 Year ended Year ended (In thousands) Number of Contracts Recorded Investment Number of Contracts Recorded Investment Number of Contracts Recorded Investment Commercial, financial and agricultural 7 $ 419 1 $ 1 4 $ 206 Commercial real estate 5 843 1 626 1 302 Construction real estate: SEPH commercial land and development — — — — — — Remaining commercial — — — — — — Mortgage — — — — — — Installment — — — — — — Residential real estate: Commercial 7 848 3 1,005 1 3 Mortgage 15 1,201 12 682 14 810 HELOC — — 1 5 2 160 Installment 1 3 2 101 2 12 Consumer 62 484 47 434 62 516 Leases — — — — — — Total loans 97 $ 3,798 $ 67 $ 2,854 86 $ 2,009

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 , 2015 , and 2014 is summarized in the following tables. Year ended December 31, 2016 (In thousands) Commercial, financial and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for credit losses: Beginning balance $ 13,694 $ 9,197 $ 8,564 $ 13,514 $ 11,524 $ 1 $ 56,494 Charge-offs 5,786 412 1,436 3,014 10,151 — 20,799 Recoveries (1,259 ) (3,671 ) (8,559 ) (2,446 ) (4,094 ) (1 ) (20,030 ) Net charge-offs (recoveries) 4,527 (3,259 ) (7,123 ) 568 6,057 (1 ) 769 Provision (Recovery) 4,267 (2,024 ) (10,440 ) (1,988 ) 5,086 (2 ) (5,101 ) Ending balance $ 13,434 $ 10,432 $ 5,247 $ 10,958 $ 10,553 — $ 50,624 Year ended December 31, 2015 (In thousands) Commercial, financial and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for credit losses: Beginning balance $ 10,719 $ 8,808 $ 8,652 $ 14,772 $ 11,401 $ — $ 54,352 Charge-offs 2,478 348 470 2,352 8,642 — 14,290 Recoveries (1,373 ) (2,241 ) (2,092 ) (2,438 ) (3,295 ) (3 ) (11,442 ) Net charge-offs (recoveries) 1,105 (1,893 ) (1,622 ) (86 ) 5,347 (3 ) 2,848 Provision (Recovery) 4,080 (1,504 ) (1,710 ) (1,344 ) 5,470 (2 ) 4,990 Ending balance $ 13,694 $ 9,197 $ 8,564 $ 13,514 $ 11,524 $ 1 $ 56,494 Year ended December 31, 2014 (In thousands) Commercial, financial and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for credit losses: Beginning balance $ 14,218 $ 15,899 $ 6,855 $ 14,251 $ 8,245 $ — $ 59,468 Charge-offs 3,779 8,003 1,316 3,944 7,738 — 24,780 Recoveries (1,003 ) (7,759 ) (12,572 ) (2,985 ) (2,671 ) (7 ) (26,997 ) Net charge-offs (recoveries) 2,776 244 (11,256 ) 959 5,067 (7 ) (2,217 ) (Recovery) Provision (723 ) (6,847 ) (9,459 ) 1,480 8,223 (7 ) (7,333 ) Ending balance $ 10,719 $ 8,808 $ 8,652 $ 14,772 $ 11,401 $ — $ 54,352
Schedule of the composition of the allowance for loan losses	The composition of the allowance for loan losses at December 31, 2016 and 2015 was as follows: December 31, 2016 (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 $ 152 $ 309 $ — $ 87 $ — $ — $ 548 Collectively evaluated for impairment 13,282 10,123 5,247 10,871 10,553 — 50,076 Total ending allowance balance $ 13,434 $ 10,432 $ 5,247 $ 10,958 $ 10,553 $ — $ 50,624 Loan Balance: Loans individually evaluated for impairment $ 20,622 $ 24,465 $ 2,226 $ 23,102 $ — $ — $ 70,415 Loans collectively evaluated for impairment 973,997 1,131,238 186,719 1,785,395 1,120,850 3,243 5,201,442 Total ending loan balance $ 994,619 $ 1,155,703 $ 188,945 $ 1,808,497 $ 1,120,850 $ 3,243 $ 5,271,857 Allowance for loan losses as a percentage of loan balance: Loans individually evaluated for impairment 0.74 % 1.26 % — % 0.38 % — % — % 0.78 % Loans collectively evaluated for impairment 1.36 % 0.89 % 2.81 % 0.61 % 0.94 % — % 0.96 % Total 1.35 % 0.90 % 2.78 % 0.61 % 0.94 % — % 0.96 % Recorded Investment: Loans individually evaluated for impairment $ 20,624 $ 24,474 $ 2,226 $ 23,102 $ — $ — $ 70,426 Loans collectively evaluated for impairment 977,553 1,135,390 187,240 1,788,714 1,124,235 3,272 5,216,404 Total ending recorded investment $ 998,177 $ 1,159,864 $ 189,466 $ 1,811,816 $ 1,124,235 $ 3,272 $ 5,286,830 December 31, 2015 (In thousands) Commercial, financial, and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for loan losses: Ending allowance balance attributed to loans Individually evaluated for impairment $ 1,904 $ 381 $ 1,356 $ 550 $ — $ — $ 4,191 Collectively evaluated for impairment 11,790 8,816 7,208 12,964 11,524 1 52,303 Total ending allowance balance $ 13,694 $ 9,197 $ 8,564 $ 13,514 $ 11,524 $ 1 $ 56,494 Loan Balance: Loans individually evaluated for impairment $ 30,545 $ 18,015 $ 6,716 $ 25,323 $ — $ — $ 80,599 Loans collectively evaluated for impairment 925,182 1,095,588 166,629 1,830,120 967,111 2,856 4,987,486 Total ending loan balance $ 955,727 $ 1,113,603 $ 173,345 $ 1,855,443 $ 967,111 $ 2,856 $ 5,068,085 Allowance for loan losses as a percentage of loan balance: Loans individually evaluated for impairment 6.23 % 2.11 % 20.19 % 2.17 % — % — % 5.20 % Loans collectively evaluated for impairment 1.27 % 0.80 % 4.33 % 0.71 % 1.19 % 0.04 % 1.05 % Total 1.43 % 0.83 % 4.94 % 0.73 % 1.19 % 0.04 % 1.11 % Recorded Investment: Loans individually evaluated for impairment $ 30,595 $ 18,025 $ 6,720 $ 25,324 $ — $ — $ 80,664 Loans collectively evaluated for impairment 928,569 1,099,587 167,042 1,833,449 970,143 2,870 5,001,660 Total ending recorded investment $ 959,164 $ 1,117,612 $ 173,762 $ 1,858,773 $ 970,143 $ 2,870 $ 5,082,324

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2016
Schedule of Assets Repossessed or Foreclosed, or loans in process of foreclosure [Line Items]
Schedule of Assets Repossessed or Foreclosed, or loans in process of foreclosure [Table Text Block] [Text Block]	The carrying amount of foreclosed properties held at December 31, 2016 and December 31, 2015 are listed below, as well as the recorded investment of loans secured by residential real estate properties for which formal foreclosure proceedings were in process at those dates. (In thousands) December 31, 2016 December 31, 2015 OREO: Commercial real estate $ 7,642 $ 8,333 Construction real estate 4,624 7,259 Residential real estate 1,660 3,059 Total OREO $ 13,926 $ 18,651 Loans in process of foreclosure: Residential real estate $ 3,250 $ 2,021

Premises And Equipment (Tables)

Premises And Equipment (Tables)	12 Months Ended
	Dec. 31, 2016
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) 2016 2015 Land $ 19,577 $ 19,123 Buildings 75,472 74,525 Equipment, furniture and fixtures 52,719 47,839 Leasehold improvements 3,400 3,878 Total $ 151,168 $ 145,365 Less accumulated depreciation (93,197 ) (85,872 ) Premises and equipment, net $ 57,971 $ 59,493
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) 2017 $ 1,508 2018 1,269 2019 1,178 2020 621 2021 422 Thereafter 700 Total $ 5,698

Investment in Qualified Affor45

Investment in Qualified Affordable Housing (Tables)	12 Months Ended
	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Equity Method Investments [Table Text Block]	The table below details the balances of Park’s affordable housing tax credit investments and related unfunded commitments as of December 31, 2016 and 2015. (In thousands) December 31, 2016 December 31, 2015 Affordable housing tax credit investments $ 52,947 $ 51,247 Unfunded commitments 14,282 20,311

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2016
Deposits [Abstract]
Schedule of summary of non-interest bearing and interest bearing deposits	At December 31, 2016 and 2015 , non-interest bearing and interest bearing deposits were as follows: December 31 (In thousands) 2016 2015 Non-interest bearing $ 1,523,417 $ 1,404,032 Interest bearing 3,998,539 3,943,610 Total $ 5,521,956 $ 5,347,642
Schedule of maturities of time deposits	At December 31, 2016 , the maturities of time deposits were as follows: (In thousands) 2017 $ 717,879 2018 131,236 2019 153,257 2020 63,758 2021 51,245 After 5 years 495 Total $ 1,117,870

Repurchase Agreements (Tables)

Repurchase Agreements (Tables)	12 Months Ended
	Dec. 31, 2016
Transfers of Certain Financial Assets Accounted for as Secured Borrowings [Abstract]
Schedule of Assets and Associated Liabilities Accounted for as Secured Borrowings [Table Text Block]	The following table presents the carrying value of Park's repurchase agreements by remaining contractual maturity and collateral pledged at December 31, 2016 and December 31, 2015 : December 31, 2016 (In thousands) Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 days 30 - 90 days Greater than 90 days Total U.S. government and agency securities $ 208,691 $ — $ — $ 301,104 $ 509,795 December 31, 2015 (In thousands) Remaining Contractual Maturity of the Agreements Overnight and Continuous Up to 30 days 30 - 90 days Greater than 90 days Total U.S. government and agency securities $ 247,618 $ 2,239 $ — $ 304,385 $ 554,242

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2016
Short-term Debt [Abstract]
Schedule of short-term debt	The outstanding balances for all short-term borrowings as of December 31, 2016 and 2015 and the weighted-average interest rates as of and paid during each of the years then ended were as follows: (In thousands) Repurchase agreements FHLB Advances 2016 Ending balance $ 209,795 $ 185,000 Highest month-end balance 248,277 185,000 Average daily balance 224,763 15,694 Weighted-average interest rate: As of year-end 0.17 % 0.80 % Paid during the year 0.16 % 0.63 % 2015 Ending balance $ 254,242 $ 140,000 Highest month-end balance 278,324 140,000 Average daily balance 257,622 1,096 Weighted-average interest rate: As of year-end 0.17 % 0.56 % Paid during the year 0.18 % 0.59 % Short-term borrowings were as follows: December 31 (In thousands) 2016 2015 Securities sold under agreements to repurchase $ 209,795 $ 254,242 FHLB advances 185,000 140,000 Total short-term borrowings $ 394,795 $ 394,242

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Schedule of maturities of long-term debt	Long-term debt is listed below: December 31, 2016 2015 (In thousands) Outstanding Balance Average Rate Outstanding Balance Average Rate Total Federal Home Loan Bank advances by year of maturity: 2017 $ 50,000 1.25 % $ 50,000 1.25 % 2018 150,000 2.04 % 150,000 2.04 % 2019 75,000 1.96 % 75,000 1.96 % 2020 25,000 2.14 % 25,000 2.14 % 2021 — — % — — % Thereafter 100,000 3.40 % 150,000 3.32 % Total $ 400,000 2.27 % 450,000 2.37 % 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: 2017 350,000 1.68 % 350,000 1.68 % 2018 150,000 2.04 % 150,000 2.04 % 2019 75,000 1.96 % 75,000 1.96 % 2020 25,000 2.14 % 25,000 2.14 % 2021 — — % — — % Thereafter 100,000 3.40 % 150,000 3.32 % Total $ 700,000 2.05 % $ 750,000 2.12 % Prepayment penalty (5,719 ) — (11,895 ) — Total long-term debt $ 694,281 2.07 % $ 738,105 2.16 %

Share-Based Compensation Change

Share-Based Compensation Changes in nonvested shares (Tables)	12 Months Ended
	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]	A summary of changes in Park's nonvested shares for the year ended December 31, 2016 follows: Shares Nonvested at January 1, 2016 44,700 Granted 41,550 Vested — Forfeited 825 Nonvested at December 31, 2016 85,425

Share-Based Compensation Additi

Share-Based Compensation Additional share based compensation expense related to PBRSUs (Tables)	12 Months Ended
	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition	The following table details expected additional share-based compensation expense related to PBRSUs currently outstanding: (In thousands) 2017 $ 1,193 2018 1,072 2019 491 2020 83 Total $ 2,839

Benefit Plans (Tables)

Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 and 2015 , plan assets and benefit obligation activity for the Pension Plan are listed below: (In thousands) 2016 2015 Change in fair value of plan assets Fair value at beginning of measurement period $ 153,498 $ 160,598 Actual return on plan assets 19,256 (58 ) Benefits paid (5,707 ) (7,042 ) Fair value at end of measurement period $ 167,047 $ 153,498 Change in benefit obligation Projected benefit obligation at beginning of measurement period $ 102,245 $ 109,328 Service cost 5,055 5,368 Interest cost 4,869 4,695 Actuarial loss (gains) 7,993 (10,104 ) Benefits paid (5,707 ) (7,042 ) Projected benefit obligation at the end of measurement period $ 114,455 $ 102,245 Funded status at end of year (fair value of plan assets less benefit obligation) $ 52,592 $ 51,253
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 2016 2015 Equity securities 50% - 100% 84 % 85 % Fixed income and cash equivalents remaining balance 16 % 15 % Total 100 % 100 %
Schedule of assumptions used to determine benefit obligations	The weighted average assumptions used to determine benefit obligations at December 31, 2016 , 2015 and 2014 were as follows: 2016 2015 2014 Discount rate 4.58 % 4.88 % 4.42 % Rate of compensation increase Under age 30 10.00 % 10.00 % 10.00 % Ages 30-39 6.00 % 6.00 % 6.00 % Ages 40-49 4.00 % 3.00 % 3.00 % Ages 50 and over 3.00 % 3.00 % 3.00 %
Schedule of estimated future pension benefit Payments	The estimated future pension benefit payments reflecting expected future service for the next ten years are shown below (in thousands): 2017 $ 6,924 2018 7,644 2019 7,875 2020 8,393 2021 9,503 2022-2026 48,058 Total $ 88,397
Schedule of balances of accumulated other comprehensive income loss	The following table shows ending balances of accumulated other comprehensive loss at December 31, 2016 and 2015. (In thousands) 2016 2015 Prior service cost $ — $ — Net actuarial loss (22,677 ) (23,618 ) Total (22,677 ) (23,618 ) Deferred taxes 7,937 8,267 Accumulated other comprehensive loss $ (14,740 ) $ (15,351 )
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 2016 , 2015 and 2014 , components of net periodic benefit income and other amounts recognized in other comprehensive income (loss) were as follows: (In thousands) 2016 2015 2014 Components of net periodic benefit income and other amounts recognized in other comprehensive income Service cost $ (5,055 ) $ (5,368 ) $ (4,331 ) Interest cost (4,869 ) (4,695 ) (4,577 ) Expected return on plan assets 10,950 11,420 10,869 Amortization of prior service cost — (15 ) (19 ) Recognized net actuarial loss (773 ) (637 ) — Net periodic benefit income $ 253 $ 705 $ 1,942 Change to net actuarial gain (loss) for the period $ 168 $ (1,400 ) $ (14,276 ) Amortization of prior service cost — 15 19 Amortization of net loss 773 637 — Total recognized in other comprehensive income (loss) 941 (748 ) (14,257 ) Total recognized in net benefit income and other comprehensive income (loss) $ 1,194 $ (43 ) $ (12,315 )
Schedule of assumptions used to determine costs	The weighted average assumptions used to determine net periodic benefit cost for the years ended December 31, 2016 , 2015 and 2014 are listed below: 2016 2015 2014 Discount Rate 4.88 % 4.42 % 5.30 % Rate of compensation increase Under age 30 10.00 % 10.00 % 10.00 % Ages 30-39 6.00 % 6.00 % 6.00 % Ages 40 and over 3.00 % 3.00 % 3.00 % Expected long-term return on plan assets 7.25 % 7.25 % 7.25 %

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2016
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) 2016 2015 Deferred tax assets: Allowance for loan losses $ 17,719 $ 19,773 Accumulated other comprehensive loss – Pension plan 7,937 8,266 Accumulated other comprehensive loss – Unrealized losses on securities 1,618 157 Deferred compensation 4,140 3,908 OREO valuation adjustments 2,322 2,418 Net deferred loan fees 1,397 1,204 Deferred contract bonus 1,074 1,031 Nonvested equity-based compensation 1,115 463 Fixed assets 781 413 Accrued litigation 793 482 Other 2,525 2,813 Total deferred tax assets $ 41,421 $ 40,928 Deferred tax liabilities: Deferred investment income 10,199 10,199 Pension plan 26,344 26,205 Mortgage servicing rights 3,243 3,153 Partnership adjustments 549 560 Other 596 872 Total deferred tax liabilities $ 40,931 $ 40,989 Net deferred tax asset (liability) $ 490 $ (61 )
Federal and state income taxes	The components of the provision for federal income taxes are shown below: December 31, (In thousands) 2016 2015 2014 Currently payable Federal $ 28,879 $ 26,153 $ 27,062 Amortization of qualified affordable housing projects 7,300 6,664 6,869 Deferred Federal 581 (250 ) 2,528 Total $ 36,760 $ 32,567 $ 36,459
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, 2016 , 2015 and 2014 . 2016 2015 2014 Statutory federal corporate tax rate 35.0 % 35.0 % 35.0 % Changes in rates resulting from: Tax exempt interest income, net of disallowed interest (1.3 )% (0.5 )% (0.5 )% Bank owned life insurance (1.2 )% (1.8 )% (1.4 )% Investments in qualified affordable housing projects, net of tax benefits (1.7 )% (1.9 )% (1.6 )% Other tax credits — % (0.9 )% — % KSOP dividend deduction (1.0 )% (1.0 )% (1.0 )% Other 0.1 % (0.2 )% (0.2 )% Effective tax rate 29.9 % 28.7 % 30.3 %
Reconciliation of unrecognized tax benefits	The following is a reconciliation of the beginning and ending amount of unrecognized tax benefits. (In thousands) 2016 2015 2014 January 1 Balance $ 558 $ 532 $ 518 Additions based on tax positions related to the current year 117 80 76 Additions for tax positions of prior years 38 16 14 Reductions for tax positions of prior years — — — Reductions due to statute of limitations (80 ) (70 ) (76 ) December 31 Balance $ 633 $ 558 $ 532

Other Comprehensive Income (L54

Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2016
Other Comprehensive Income (Loss) [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]	Other comprehensive income (loss) components, net of income tax, are shown in the following table for the years ended December 31, 2016 , 2015 and 2014 . Year ended December 31, (in thousands) Changes in Pension Plan assets and benefit obligations Unrealized gains and losses on available-for-sale securities Total Beginning balance at January 1, 2016 $ (15,351 ) $ (292 ) $ (15,643 ) Other comprehensive gain (loss) before reclassifications 109 (2,713 ) (2,604 ) Amounts reclassified from accumulated other comprehensive loss 502 — 502 Net current period other comprehensive income (loss) 611 (2,713 ) (2,102 ) Ending balance at December 31, 2016 $ (14,740 ) $ (3,005 ) $ (17,745 ) Beginning balance at January 1, 2015 $ (14,865 ) $ 1,257 $ (13,608 ) Other comprehensive loss before reclassifications (910 ) (1,549 ) (2,459 ) Amounts reclassified from accumulated other comprehensive loss 424 — 424 Net current period other comprehensive loss (486 ) (1,549 ) (2,035 ) Ending balance at December 31, 2015 $ (15,351 ) $ (292 ) $ (15,643 ) Beginning balance at January 1, 2014 $ (5,598 ) $ (29,821 ) $ (35,419 ) Other comprehensive (loss) gain before reclassifications (9,279 ) 30,325 21,046 Amounts reclassified from accumulated other comprehensive loss 12 753 765 Net current period other comprehensive (loss) income (9,267 ) 31,078 21,811 Ending balance at December 31, 2014 $ (14,865 ) $ 1,257 $ (13,608 )
Schedule of components of other comprehensive income (loss)	The following table provides information concerning amounts reclassified out of accumulated other comprehensive loss for the years ended December 31, 2016 , 2015 and 2014 : Amount Reclassified from Accumulated Other Comprehensive Income (Loss) Affected Line Item in the Consolidated Statement of Income (In thousands) 2016 2015 2014 Amortization of defined benefit pension items Amortization of prior service cost $ — $ 15 $ 19 Employee benefits Amortization of net loss 773 637 — Employee benefits Income before income taxes 773 652 19 Income before income taxes Federal income taxes 271 228 7 Federal income taxes Net of income tax $ 502 $ 424 $ 12 Net of income tax Unrealized gains & losses on available for sale securities Loss on sale of investment securities $ — $ — $ 1,158 Gain (loss) on sale of investment securities Other than temporary impairment — — — Miscellaneous expense Income before income taxes — — 1,158 Income before income taxes Federal income taxes — — 405 Federal income taxes Net of income tax $ — $ — $ 753 Net of income tax

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2016
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 2016 2015 2014 Numerator: Net income available to common shareholders $ 86,135 $ 81,012 $ 83,957 Denominator: Weighted-average common shares outstanding 15,332,553 15,364,281 15,394,971 Effect of dilutive performance-based restricted stock units 72,607 40,459 18,861 Weighted-average common shares outstanding adjusted for the effect of dilutive performance-based restricted stock units 15,405,160 15,404,740 15,413,832 Earnings per common share: Basic earnings per common share $ 5.62 $ 5.27 $ 5.45 Diluted earnings per common share $ 5.59 $ 5.26 $ 5.45

Financial Instruments With Of56

Financial Instruments With Off-Balance Sheet Risk And Financial Instruments With Concentrations Of Credit Risk (Tables)	12 Months Ended
	Dec. 31, 2016
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) 2016 2015 Loan commitments $ 912,007 $ 888,411 Standby letters of credit 13,746 12,326

Loan Servicing (Tables)

Loan Servicing (Tables)	12 Months Ended
	Dec. 31, 2016
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) 2016 2015 2014 Mortgage servicing rights: Carrying amount, net, beginning of year $ 9,008 $ 8,613 $ 9,013 Additions 2,286 1,748 1,026 Amortization (1,835 ) (1,637 ) (1,631 ) Change in valuation allowance (193 ) 284 205 Carrying amount, net, end of year $ 9,266 $ 9,008 $ 8,613 Valuation allowance: Beginning of year $ 542 $ 826 $ 1,031 Change in valuation allowance 193 (284 ) (205 ) End of year $ 735 $ 542 $ 826

Fair Values (Tables)

Fair Values (Tables)	12 Months Ended
	Dec. 31, 2016
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Schedule of financial assets and liabilities measured on a recurring basis	The following table presents assets and liabilities measured at fair value on a recurring basis: Fair Value Measurements at December 31, 2016 using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2016 Assets Investment securities: Obligations of U.S. Treasury and other U.S. Government sponsored entities $ — $ 267,533 $ — $ 267,533 U.S. Government sponsored entities’ asset-backed securities — 987,172 — 987,172 Equity securities 2,644 — 790 3,434 Mortgage loans held for sale — 10,413 — 10,413 Mortgage IRLCs — 124 — 124 Liabilities Fair value swap $ — $ — $ 226 $ 226 Fair Value Measurements at December 31, 2015 using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2015 Assets Investment securities: Obligations of U.S. Treasury and other U.S. Government sponsored entities $ — $ 522,063 $ — $ 522,063 U.S. Government sponsored entities’ asset-backed securities — 911,493 — 911,493 Equity securities 1,941 — 769 2,710 Mortgage loans held for sale — 7,306 — 7,306 Mortgage IRLCs — 165 — 165 Liabilities Fair value swap $ — $ — $ 226 $ 226
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, 2016 and 2015 , 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, 2016 $ 769 $ (226 ) Total Gains (Losses) Included in earnings - realized — — Included in earnings - unrealized — — Included in other comprehensive income 21 — Purchases, sales, issuances and settlements, other, net — — Re-evaluation of fair value swap — — Balance at December 31, 2016 $ 790 $ (226 ) Balance at January 1, 2015 $ 776 $ (226 ) Total Gains (Losses) Included in earnings - realized — — Included in earnings - unrealized — — Included in other comprehensive income (7 ) — Purchases, sales, issuances and settlements, other, net — — Re-evaluation of fair value swap — — Balance at December 31, 2015 $ 769 $ (226 )
Schedule of assets and liabilities measured at fair value on a nonrecurring basis	Fair Value Measurements at December 31, 2016 Using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2016 Impaired Loans: Commercial real estate $ — $ — $ 3,057 $ 3,057 Construction real estate — — 541 541 Residential real estate — — 2,385 2,385 Total impaired loans $ — $ — $ 5,983 $ 5,983 Mortgage Servicing Rights $ — $ 6,769 $ — $ 6,769 Other Real Estate Owned: Commercial real estate — — 2,644 2,644 Construction real estate — — 3,322 3,322 Residential real estate — — 931 931 Total Other Real Estate Owned $ — $ — $ 6,897 $ 6,897 Fair Value Measurements at December 31, 2015 Using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2015 Impaired Loans: Commercial real estate $ — $ — $ 3,698 $ 3,698 Construction real estate: SEPH commercial land and development — — 2,044 2,044 Remaining commercial — — 1,872 1,872 Residential real estate — — 1,882 1,882 Total impaired loans $ — $ — $ 9,496 $ 9,496 Mortgage Servicing Rights $ — $ 1,867 $ — $ 1,867 Other Real Estate Owned: Commercial real estate — — 2,796 2,796 Construction real estate — — 3,387 3,387 Residential real estate — — 2,332 2,332 Total Other Real Estate Owned $ — $ — $ 8,515 $ 8,515
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 quantitative information about Level 3 fair value measurements for financial instruments measured at fair value on a non-recurring basis at December 31, 2016 and December 31, 2015 : December 31, 2016 (In thousands) Fair Value Valuation Technique Unobservable Input(s) Range (Weighted Average) Impaired loans: Commercial real estate $ 3,057 Sales comparison approach Adj to comparables 0.0% - 90.0% (20.2%) Income approach Capitalization rate 9.0% - 10.6% (10.1%) Cost approach Accumulated depreciation 17.0% - 18.0% (17.8%) Construction real estate $ 541 Sales comparison approach Adj to comparables 0.0% - 11.1% (1.6%) Bulk sale approach Discount rate 10.0% (10.0%) Residential real estate $ 2,385 Sales comparison approach Adj to comparables 0.3% - 110.0% (17.0%) Income approach Capitalization rate 10.0% (10.0%) Other real estate owned: Commercial real estate $ 2,644 Sales comparison approach Adj to comparables 0.0% - 68.4% (26.5%) Income approach Capitalization rate 13.0% - 14.0% (13.1%) Construction real estate $ 3,322 Sales comparison approach Adj to comparables 0.0% - 90.0% (24.7%) Bulk sale approach Discount rate 15.0% (15.0%) Residential real estate $ 931 Sales comparison approach Adj to comparables 3.2% - 79.7% (30.6%) December 31, 2015 (In thousands) Fair Value Valuation Technique Unobservable Input(s) Range (Weighted Average) Impaired loans: Commercial real estate $ 3,698 Sales comparison approach Adj to comparables 0.0% - 45.9% (20.3%) Income approach Capitalization rate 7.0% - 13.3% (9.5%) Cost approach Accumulated depreciation 50.0% (50.0%) Construction real estate: SEPH commercial land and development $ 2,044 Sales comparison approach Adj to comparables 5.0% - 40.0% (22.1%) Bulk sale approach Discount rate 10.7% (10.7%) Remaining commercial $ 1,872 Sales comparison approach Adj to comparables 0.0% - 25.3% (1.0%) Bulk sale approach Discount rate 10.0% - 10.7% (10.0%) Residential real estate $ 1,882 Sales comparison approach Adj to comparables 0.0% - 96.7% (12.5%) Income approach Capitalization rate 3.8% - 10.1% (9.1%) Cost approach Accumulated depreciation 33.3% - 50.0% (43.4%) Other real estate owned: Commercial real estate $ 2,796 Sales comparison approach Adj to comparables 2.0% - 71.0% (26.9%) Income approach Capitalization rate 9.5% (9.5%) Construction real estate $ 3,387 Sales comparison approach Adj to comparables 0.0% - 85.0% (24.3%) Bulk sale approach Discount rate 15.0% (15.0%) Residential real estate $ 2,332 Sales comparison approach Adj to comparables 0.1% - 61.8% (23.0%)
Fair value, by balance sheet grouping	The fair value of financial instruments at December 31, 2016 and December 31, 2015 , was as follows: December 31, 2016 Fair Value Measurements (In thousands) Carrying value Level 1 Level 2 Level 3 Total fair value Financial assets: Cash and money market instruments $ 146,466 $ 146,466 $ — $ — $ 146,466 Investment securities 1,517,972 2,644 1,511,377 790 1,514,811 Accrued interest receivable - securities 3,849 — 3,849 — 3,849 Accrued interest receivable - loans 14,973 — — 14,973 14,973 Mortgage loans held for sale 10,413 — 10,413 — 10,413 Impaired loans carried at fair value 5,983 — — 5,983 5,983 Mortgage IRLCs 124 — 124 — 124 Other loans 5,204,713 — — 5,161,919 5,161,919 Loans receivable, net $ 5,221,233 $ — $ 10,537 $ 5,167,902 $ 5,178,439 Financial liabilities: Non-interest bearing checking accounts $ 1,523,417 $ 1,523,417 $ — $ — $ 1,523,417 Interest bearing transaction accounts 1,174,448 1,174,448 — — 1,174,448 Savings accounts 1,704,920 1,704,920 — — 1,704,920 Time deposits 1,117,870 — 1,122,598 — 1,122,598 Other 1,301 1,301 — — 1,301 Total deposits $ 5,521,956 $ 4,404,086 $ 1,122,598 $ — $ 5,526,684 Short-term borrowings $ 394,795 $ — $ 394,795 $ — $ 394,795 Long-term debt 694,281 — 712,958 — 712,958 Subordinated notes 45,000 — 40,903 — 40,903 Accrued interest payable – deposits 900 82 818 — 900 Accrued interest payable – debt/borrowings 1,251 1 1,250 — 1,251 Derivative financial instruments: Fair value swap $ 226 $ — $ — $ 226 $ 226 December 31, 2015 Fair Value Measurements (In thousands) Carrying value Level 1 Level 2 Level 3 Total fair value Financial assets: Cash and money market instruments $ 149,459 $ 149,459 $ — $ — $ 149,459 Investment securities 1,585,568 1,941 1,584,984 769 1,587,694 Accrued interest receivable - securities 4,436 — 4,436 — 4,436 Accrued interest receivable - loans 14,239 — — 14,239 14,239 Mortgage loans held for sale 7,306 — 7,306 — 7,306 Impaired loans carried at fair value 9,496 — — 9,496 9,496 Mortgage IRLCs 165 — 165 — 165 Other loans 4,994,624 — — 4,997,318 4,997,318 Loans receivable, net $ 5,011,591 $ — $ 7,471 $ 5,006,814 $ 5,014,285 Financial liabilities: Non-interest bearing checking accounts $ 1,404,032 $ 1,404,032 $ — — $ 1,404,032 Interest bearing transaction accounts 1,107,200 1,107,200 — — 1,107,200 Savings accounts 1,544,708 1,544,708 — — 1,544,708 Time deposits 1,290,412 — 1,295,329 — 1,295,329 Other 1,290 1,290 — — 1,290 Total deposits $ 5,347,642 $ 4,057,230 $ 1,295,329 $ — $ 5,352,559 Short-term borrowings $ 394,242 $ — $ 394,242 $ — $ 394,242 Long-term debt 738,105 — 771,420 — 771,420 Subordinated notes 45,000 — 41,596 — 41,596 Accrued interest payable – deposits 987 66 921 — 987 Accrued interest payable – debt/borrowings 1,351 4 1,347 — 1,351 Derivative financial instruments: Fair value swap $ 226 $ — $ — $ 226 $ 226
Impaired Financing Receivables [Table Text Block]	December 31, 2016 (In thousands) Recorded Investment Prior Charge-Offs Specific Valuation Allowance Carrying Balance Impaired loans recorded at fair value $ 6,379 $ 3,681 $ 396 $ 5,983 Remaining impaired loans 64,047 21,262 152 63,895 Total impaired loans $ 70,426 $ 24,943 $ 548 $ 69,878 December 31, 2015 (In thousands) Recorded Investment Prior Charge-Offs Specific Valuation Allowance Carrying Balance Impaired loans recorded at fair value $ 11,783 $ 10,512 $ 2,287 $ 9,496 Remaining impaired loans 68,881 18,193 1,904 66,977 Total impaired loans $ 80,664 $ 28,705 $ 4,191 $ 76,473

Capital Ratios (Tables)

Capital Ratios (Tables)	12 Months Ended
	Dec. 31, 2016
Capital [Abstract]
Schedule of compliance with regulatory capital requirements under banking regulations	The following table indicates the capital ratios for PNB and Park at December 31, 2016 and 2015. As of December 31, 2016 Leverage Tier 1 Risk-Based Common Equity Tier 1 Total Risk-Based The Park National Bank 7.34 % 9.87 % 9.87 % 11.24 % Park National Corporation 9.56 % 12.83 % 12.55 % 14.32 % Adequately capitalized ratio 4.00 % 6.00 % 4.50 % 8.00 % Adequately capitalized ratio plus capital conservation buffer 4.00 % 8.50 % 7.00 % 10.50 % Well-capitalized ratio (PNB only) 5.00 % 8.00 % 6.50 % 10.00 % As of December 31, 2015 Leverage Tier 1 Risk-Based Common Equity Tier 1 Total Risk-Based The Park National Bank 7.06 % 9.83 % 9.83 % 11.37 % Park National Corporation 9.22 % 12.82 % 12.54 % 14.49 % Adequately capitalized ratio 4.00 % 6.00 % 4.50 % 8.00 % Adequately capitalized ratio plus capital conservation buffer 4.00 % 8.50 % 7.00 % 10.50 % Well-capitalized ratio (PNB only) 5.00 % 8.00 % 6.50 % 10.00 %
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, 2016 Total Risk-Based Capital PNB $ 607,269 11.24 % $ 432,153 8.00 % $ 540,192 10.00 % Park 784,406 14.32 % 438,231 8.00 % N/A N/A Tier 1 Risk-Based Capital PNB $ 533,215 9.87 % $ 324,115 6.00 % $ 432,153 8.00 % Park 702,651 12.83 % 328,673 6.00 % N/A N/A Leverage Ratio PNB $ 533,215 7.34 % $ 290,671 4.00 % $ 363,339 5.00 % Park 702,651 9.56 % 293,916 4.00 % N/A N/A Common Equity Tier 1 PNB $ 533,215 9.87 % $ 243,086 4.50 % $ 351,125 6.50 % Park 687,651 12.55 % 246,505 4.50 % N/A N/A At December 31, 2015 Total Risk-Based Capital PNB $ 588,467 11.37 % $ 414,079 8.00 % $ 517,599 10.00 % Park 758,988 14.49 % 419,080 8.00 % N/A N/A Tier 1 Risk-Based Capital PNB $ 508,763 9.83 % $ 310,560 6.00 % $ 414,079 8.00 % Park 671,664 12.82 % 314,310 6.00 % N/A N/A Leverage Ratio PNB $ 508,763 7.06 % $ 288,147 4.00 % $ 360,183 5.00 % Park 671,664 9.22 % 291,449 4.00 % N/A N/A Common Equity Tier 1 PNB 508,763 9.83 % 232,920 4.50 % 336,439 6.50 % Park 656,664 12.54 % 235,732 4.50 % N/A N/A

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2016
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, 2016 (In thousands) PNB GFSC SEPH All Other Total Net interest income (loss) $ 227,576 $ 5,874 $ 4,774 $ (138 ) $ 238,086 Provision for (recovery of) loan losses 2,611 1,887 (9,599 ) — (5,101 ) Other income (loss) 74,803 (1 ) 2,974 955 78,731 Other expense 177,562 4,457 7,273 9,731 199,023 Income (loss) before taxes 122,206 (471 ) 10,074 (8,914 ) 122,895 Income taxes (benefit) 37,755 (164 ) 3,526 (4,357 ) 36,760 Net income (loss) $ 84,451 $ (307 ) $ 6,548 $ (4,557 ) $ 86,135 Balances at December 31, 2016 Assets $ 7,389,538 $ 32,268 $ 25,342 $ 20,438 $ 7,467,586 Loans 5,234,828 32,661 12,354 (7,986 ) 5,271,857 Deposits 5,630,199 3,809 — (112,052 ) 5,521,956 Operating results for the year ended December 31, 2015 (In thousands) PNB GFSC SEPH All Other Total Net interest income (loss) $ 220,879 $ 6,588 $ (74 ) $ 239 $ 227,632 Provision for (recovery of) loan losses 7,665 1,415 (4,090 ) — 4,990 Other income 75,188 2 1,848 513 77,551 Other expense 167,476 2,984 6,182 9,972 186,614 Income (loss) before taxes 120,926 2,191 (318 ) (9,220 ) 113,579 Income taxes (benefit) 36,581 768 (111 ) (4,671 ) 32,567 Net income (loss) $ 84,345 $ 1,423 $ (207 ) $ (4,549 ) $ 81,012 Balances at December 31, 2015 Assets $ 7,229,764 $ 35,793 $ 33,541 $ 12,256 $ 7,311,354 Loans 5,029,072 35,469 15,153 (11,609 ) 5,068,085 Deposits 5,447,293 4,627 — (104,278 ) 5,347,642 Operating results for the year ended December 31, 2014 (In thousands) PNB GFSC SEPH All Other Total Net interest income (loss) $ 218,641 $ 7,457 $ 958 $ (2,012 ) $ 225,044 Provision for (recovery of) loan losses 3,517 1,544 (12,394 ) — (7,333 ) Other income (loss) 69,384 (1 ) 5,991 175 75,549 Other expense 163,641 4,103 11,766 8,000 187,510 Income (loss) before taxes 120,867 1,809 7,577 (9,837 ) 120,416 Income taxes (benefit) 37,960 634 2,652 (4,787 ) 36,459 Net income (loss) $ 82,907 $ 1,175 $ 4,925 $ (5,050 ) $ 83,957 Balances at December 31, 2014 Assets $ 6,910,386 $ 40,308 $ 43,762 $ 6,743 $ 7,001,199 Loans 4,781,761 40,645 23,956 (16,680 ) 4,829,682 Deposits 5,222,766 5,883 — (100,649 ) 5,128,000
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: 2016 (In thousands) Net Interest Income Depreciation Expense Other Expense Income Taxes Assets Deposits Totals for reportable segments $ 238,224 $ 8,396 $ 180,896 $ 41,117 $ 7,447,148 $ 5,634,008 Elimination of intersegment items 2,164 — — — (9,204 ) (112,052 ) Parent Co. totals - not eliminated (2,302 ) — 9,731 (4,357 ) 29,642 — Totals $ 238,086 $ 8,396 $ 190,627 $ 36,760 $ 7,467,586 $ 5,521,956 2015 (In thousands) Net Interest Income Depreciation Expense Other Expense Income Taxes Assets Deposits Totals for reportable segments $ 227,393 $ 7,347 $ 169,295 $ 37,238 $ 7,299,098 $ 5,451,920 Elimination of intersegment items 2,561 — — — (13,557 ) (104,278 ) Parent Co. totals - not eliminated (2,322 ) — 9,972 (4,671 ) 25,813 — Totals $ 227,632 $ 7,347 $ 179,267 $ 32,567 $ 7,311,354 $ 5,347,642 2014 (In thousands) Net Interest Income Depreciation Expense Other Expense Income Taxes Assets Deposits Totals for reportable segments $ 227,056 $ 7,243 $ 172,267 $ 41,246 $ 6,994,456 $ 5,228,649 Elimination of intersegment items 3,708 — — — (18,556 ) (100,649 ) Parent Co. totals - not eliminated (5,720 ) — 8,000 (4,787 ) 25,299 — Totals $ 225,044 $ 7,243 $ 180,267 $ 36,459 $ 7,001,199 $ 5,128,000

Parent Company Statements (Tabl

Parent Company Statements (Tables)	12 Months Ended
	Dec. 31, 2016
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Balance Sheets	Balance Sheets December 31, 2016 and 2015 (In thousands) 2016 2015 Assets: Cash $ 112,067 $ 102,416 Investment in subsidiaries 626,569 613,383 Debentures receivable from PNB 25,000 25,000 Other investments 2,962 2,341 Other assets 26,651 23,443 Total assets $ 793,249 $ 766,583 Liabilities: Subordinated notes 45,000 45,000 Other liabilities 6,009 8,228 Total liabilities 51,009 53,228 Total shareholders’ equity 742,240 713,355 Total liabilities and shareholders’ equity $ 793,249 $ 766,583
Statements of Income	Statements of Income for the years ended December 31, 2016, 2015 and 2014 (In thousands) 2016 2015 2014 Income: Dividends from subsidiaries $ 60,000 $ 60,000 $ 60,000 Interest and dividends 2,164 2,561 3,708 Other 1,081 560 262 Total income 63,245 63,121 63,970 Expense: Other, net 12,159 12,341 13,807 Total expense 12,159 12,341 13,807 Income before federal taxes and equity in undistributed income of subsidiaries 51,086 50,780 50,163 Federal income tax benefit 4,357 4,671 4,787 Income before equity in undistributed income of subsidiaries 55,443 55,451 54,950 Equity in undistributed income of subsidiaries 30,692 25,561 29,007 Net income $ 86,135 $ 81,012 $ 83,957 Other comprehensive (loss) income (1) (2,102 ) (2,035 ) 21,811 Comprehensive income 84,033 78,977 105,768
Statements of Cash Flows	Statements of Cash Flows for the years ended December 31, 2016, 2015 and 2014 (In thousands) 2016 2015 2014 Operating activities: Net income $ 86,135 $ 81,012 $ 83,957 Adjustments to reconcile net income to net cash provided by operating activities: Undistributed income of subsidiaries (30,692 ) (25,561 ) (29,007 ) Compensation expense for issuance of treasury stock to directors 950 963 801 Share-based compensation expense 1,864 865 458 Increase in other assets (3,425 ) (182 ) (1,292 ) (Decrease) increase in other liabilities (2,524 ) 485 298 Net cash provided by operating activities 52,308 57,582 55,215 Investing activities: Repayment of investments in and advances to subsidiaries 15,000 10,000 32,000 Net cash provided by investing activities 15,000 10,000 32,000 Financing activities: Cash dividends paid (57,653 ) (57,776 ) (57,876 ) Repayment of subordinated notes — — (35,250 ) Repurchase of treasury shares — (6,058 ) (2,355 ) Cash payment for fractional shares (4 ) (3 ) (5 ) Net cash used in financing activities (57,657 ) (63,837 ) (95,486 ) Increase (decrease) in cash 9,651 3,745 (8,271 ) Cash at beginning of year 102,416 98,671 106,942 Cash at end of year $ 112,067 $ 102,416 $ 98,671

Summary of Significant Accoun62

Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Line Items]
Goodwill	$ 72,334	$ 72,334
Average required reserve balance	$ 51,600	$ 44,200
Historical loss period used in estimating loan loss reserve	84 months
Reserve coverage period in historical losses	1 year 11 months 12 days	1 year 11 months 26 days
Compensating Balance, Amount	$ 0
Commercial Loan
Accounting Policies [Line Items]
Reserve coverage period in historical losses	3 years 2 months 13 days	2 years 4 months 12 days
Consumer
Accounting Policies [Line Items]
Financing Receivable, Allowance for Credit Losses, Factors that Influenced Management's Judgment	0.0034	0.0042
Commercial Portfolio Segment [Member]
Accounting Policies [Line Items]
Financing Receivable, Allowance for Credit Losses, Factors that Influenced Management's Judgment	0.0039	0.0053

Summary of Significant Accoun63

Summary of Significant Accounting Policies - Depreciable Lives of Premises and Equipment (Details)	12 Months Ended
	Dec. 31, 2016
Minimum | Buildings
Property, Plant and Equipment [Line Items]
Premises and equipment, depreciable lives	30 years
Minimum | Equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Premises and equipment, depreciable lives	3 years
Minimum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, depreciable lives	1 year
Maximum | Buildings
Property, Plant and Equipment [Line Items]
Premises and equipment, depreciable lives	30 years
Maximum | Equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Premises and equipment, depreciable lives	12 years
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and equipment, depreciable lives	10 years

Investment Securities - Narrat

Investment Securities - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule of Investments [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	35.00%	35.00%	35.00%
Tax Equivalent Interest Adjustment	$ 1,400,000
Other than Temporary Impairment Losses, Investments	0	$ 0	$ 0
Amortized cost of securities available-for-sale	1,262,761,000	1,436,714,000
Securities held-to-maturity, at amortized cost (fair value of $256,672 and $151,428 at December 31, 2016 and 2015, respectively)	259,833,000	149,302,000
Federal home loan bank stock	50,100,000	50,086,000
Federal reserve bank stock	$ 8,200,000	8,226,000
Investment Securities average remaining life	4 years 5 months 2 days
Money pledged for government and trust department deposits	$ 343,000,000	429,000,000
Money pledged to secure repurchase agreements	569,000,000	622,000,000
Money Pledged as Collateral for FHLB Advance Borrowings	$ 25,000,000	21,000,000
Schedule of Repurchase Agreement Counterparties with Whom Repurchase Agreements Exceed 10 Percent of Stockholders' Equity [Table Text Block]	0
Percentage of amount greater than shareholder's equity	10.00%
Held-to-maturity Securities, Sold Security, Realized Gain (Loss)		88,000
Available-for-sale Securities, Gross Realized Gains			22,000
Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments		1,200,000
Equity investments	$ 3,500,000	0
Securities sold at a gain [Member]
Schedule of Investments [Line Items]
Amortized cost of securities available-for-sale			187,000
Securities held-to-maturity, at amortized cost (fair value of $256,672 and $151,428 at December 31, 2016 and 2015, respectively)		3,056,000
Securities sold at a loss [Member]
Schedule of Investments [Line Items]
Amortized cost of securities available-for-sale	$ 0		$ 174,100,000
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	$ 991,642,000	907,989,000
Securities held-to-maturity, at amortized cost (fair value of $256,672 and $151,428 at December 31, 2016 and 2015, respectively)	71,211,000	$ 101,112,000
Residential mortgage-backed securities
Schedule of Investments [Line Items]
Amortized cost of securities available-for-sale	545,100,000
Securities held-to-maturity, at amortized cost (fair value of $256,672 and $151,428 at December 31, 2016 and 2015, respectively)	0
Collateralized mortgage-backed securities
Schedule of Investments [Line Items]
Amortized cost of securities available-for-sale	446,500,000
Securities held-to-maturity, at amortized cost (fair value of $256,672 and $151,428 at December 31, 2016 and 2015, respectively)	$ 71,200,000
Minimum | U.S. Treasury and sponsored entities callable notes
Schedule of Investments [Line Items]
Available for Sale Securities, Debt Maturities, Term	10 months 20 days
Maximum | U.S. Treasury and sponsored entities callable notes
Schedule of Investments [Line Items]
Available for Sale Securities, Debt Maturities, Term	3 years 6 months

Investment Securities - Schedu

Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Securities Available-for-Sale
Amortized Cost	$ 1,262,761	$ 1,436,714
Gross Unrealized/Unrecognized Holding Gains	7,687	10,366
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	12,309	10,814
Estimated Fair Value	1,258,139	1,436,266
Securities Held-to-Maturity
Securities held-to-maturity, at amortized cost (fair value of $256,672 and $151,428 at December 31, 2016 and 2015, respectively)	259,833	149,302
Gross Unrealized/Unrecognized Holding Gains	2,074	2,260
Gross Unrealized/Unrecognized Holding Losses	5,235	134
Estimated Fair Value	256,672	151,428
Obligations of U.S. Treasury and other U.S. Government sponsored entities
Securities Available-for-Sale
Amortized Cost	270,000	527,605
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	2,467	5,542
Estimated Fair Value	267,533	522,063
Obligations of States and Political Subdivisions
Securities Held-to-Maturity
Securities held-to-maturity, at amortized cost (fair value of $256,672 and $151,428 at December 31, 2016 and 2015, respectively)	188,622	48,190
Gross Unrealized/Unrecognized Holding Gains	977	734
Gross Unrealized/Unrecognized Holding Losses	5,148
Estimated Fair Value	184,451	48,924
U.S. Government sponsored entity asset-backed securities
Securities Available-for-Sale
Amortized Cost	991,642	907,989
Gross Unrealized/Unrecognized Holding Gains	5,372	8,776
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	9,842	5,272
Estimated Fair Value	987,172	911,493
Securities Held-to-Maturity
Securities held-to-maturity, at amortized cost (fair value of $256,672 and $151,428 at December 31, 2016 and 2015, respectively)	71,211	101,112
Gross Unrealized/Unrecognized Holding Gains	1,097	1,526
Gross Unrealized/Unrecognized Holding Losses	87	134
Estimated Fair Value	72,221	102,504
Equity securities
Securities Available-for-Sale
Amortized Cost	1,119	1,120
Gross Unrealized/Unrecognized Holding Gains	2,315	1,590
Estimated Fair Value	$ 3,434	$ 2,710

Investment Securities - Sche66

Investment Securities - Schedule of Unrealized Loss on Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 Months	$ 860,016	$ 711,142
12 Months or Longer	47,163	309,633
Total	907,179	1,020,775
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months	11,778	4,893
12 Months or Longer	531	5,921
Total	12,309	10,814
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 Months	134,909
12 Months or Longer	7,564
Total	142,473
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months	5,148
12 Months or Longer	87
Total	5,235
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	247,695	326,973
12 Months or Longer	19,838	195,090
Total	267,533	522,063
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months	2,305	2,117
12 Months or Longer	162	3,425
Total	2,467	5,542
U.S. Government sponsored entity asset-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 Months	612,321	384,169
12 Months or Longer	27,325	114,543
Total	639,646	498,712
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months	9,473	2,776
12 Months or Longer	369	2,496
Total	9,842	5,272
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 Months		5,656
12 Months or Longer	7,564	7,792
Total	7,564	13,448
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months		10
12 Months or Longer	87	124
Total	87	$ 134
Obligations of States and Political Subdivisions
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 Months	134,909
Total	134,909
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months	5,148
Total	$ 5,148

Investment Securities - Amorti

Investment Securities - Amortized Cost and Estimated Fair Value of Investments in Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Estimated Fair Value	$ 1,258,139	$ 1,436,266
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	188,622
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	184,451
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]
U.S. Government sponsored entities’ asset-backed securities	259,833	149,302
Obligations of U.S. Treasury and other U.S. Government sponsored entities
Schedule of Investments [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	25,000
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	$ 24,933
Available for Sale Securities Debt Maturities next twelve months Weighted Avg Yield	0.87%
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract]
Due one through five years	$ 245,000
Total	270,000
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Due one through five years	242,600
Estimated Fair Value	$ 267,533	522,063
Available for Sale Securities Weighted Avg Yield	1.18%
Available for Sale Securities Debt Maturities After One Through Five Years Weighted Avg Yield	1.22%
Obligations of States and Political Subdivisions
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	$ 188,622
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	184,451
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]
U.S. Government sponsored entities’ asset-backed securities	$ 188,622	48,190
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]
Held to Maturity Securities weighted avg yield	4.50%
U.S. Government sponsored entity asset-backed securities
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract]
Total	$ 991,642
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Estimated Fair Value	$ 987,172	911,493
Available for Sale Securities Weighted Avg Yield	2.10%
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]
U.S. Government sponsored entities’ asset-backed securities	$ 71,211	$ 101,112
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]
Held to Maturity Securities weighted avg yield	3.31%

Loans - Narrative (Details)

Loans - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Deferred Income	$ 11,100,000	$ 10,400,000
Deposit Liabilities Reclassified as Loans Receivable	2,900,000	1,700,000
Troubled Debt Restructuring, Classification removed	2,700,000	1,200,000
Partial charge-offs on impaired loans	24,943,000	28,705,000
Allowance for loans individually evaluated for impairment	548,000	4,191,000
Recorded investment, related to loans	2,100,000	19,900,000
Loans 90 days past due and still accruing	2,138,000	1,975,000
financing receivable non accrual current	65,900,000	55,500,000
TDRs included in nonaccrual loan totals	46,900,000	41,100,000
Nonaccrual TDRs considered current	38,000,000	19,100,000
TDRs included in accruing loan totals	18,200,000	25,100,000
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR	700,000	2,300,000
Specific reserves related to troubled debt restructuring	200,000	2,300,000
Additional specific reserves related to troubled debt restructuring	1,000,000	1,300,000	$ 700,000
Modified substandard commercial loans, total recorded investment	26,000	116,000
Modified substandard consumer loans total recorded investment	7,400,000	16,500,000
Nonaccrual loans not classified as TDRs at prior fiscal year end	9,400,000	800,000	700,000
Recorded investment modified as TDRs	3,798,000	2,854,000	2,009,000
Consumer
Financing Receivable, Recorded Investment [Line Items]
Allowance for loans individually evaluated for impairment	0	0
Loans 90 days past due and still accruing	1,139,000	1,093,000
Executive officers and directors
Financing Receivable, Recorded Investment [Line Items]
Loans due from related party	43,400,000	47,000,000
New loan made to related party	5,400,000	5,800,000
Repayment of loans due from related party	15,300,000	12,900,000
Increase (Decrease) in Customer Advances	3,500,000	7,100,000
Accruing
Financing Receivable, Recorded Investment [Line Items]
Recorded investment modified as TDRs	111,000	44,000	314,000
Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Recorded investment modified as TDRs	3,700,000	2,800,000	$ 1,700,000
Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment [Line Items]
Partial charge-offs on impaired loans	24,700,000	24,200,000
Financing Receivable With Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment [Line Items]
Partial charge-offs on impaired loans	200,000	4,500,000
Loans receivable | Executive officers and directors
Financing Receivable, Recorded Investment [Line Items]
Loans due from related party	$ 29,600,000	$ 36,000,000

Loans - Composition of Loan Po

Loans - Composition of Loan Portfolio By Class of Loan (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		$ 95,358	$ 109,305
Impaired Financing Receivable, Recorded Investment		70,426	80,664	$ 73,712
Impaired Financing Receivable, Related Allowance		548	4,191
Loan Balance		5,271,857	5,068,085
Accrued Interest Receivable		14,973	14,239
Recorded Investment		5,286,830	5,082,324
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		20,624	30,595	19,106
Loan Balance	[1]	994,619	955,727
Accrued Interest Receivable	[1]	3,558	3,437
Recorded Investment	[1]	998,177	959,164
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		24,474	18,025	21,989
Loan Balance	[1]	1,155,703	1,113,603
Accrued Interest Receivable	[1]	4,161	4,009
Recorded Investment	[1]	1,159,864	1,117,612
Construction real estate
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		188,945	173,345
Recorded Investment		189,466	173,762
SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Loan Balance	[1]	0	2,044
Accrued Interest Receivable	[1]	0	0
Recorded Investment	[1]	0	2,044
Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		2,226	4,676	5,609
Loan Balance		135,343	128,046
Accrued Interest Receivable		398	321
Recorded Investment		135,741	128,367
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		48,699	36,722
Accrued Interest Receivable		106	75
Recorded Investment		48,805	36,797
Installment
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		4,903	6,533
Accrued Interest Receivable		17	21
Recorded Investment		4,920	6,554
Commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		23,102	25,324	$ 24,930
Loan Balance		406,687	410,571
Accrued Interest Receivable		940	1,014
Recorded Investment		407,627	411,585
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		1,169,495	1,210,819
Accrued Interest Receivable		1,459	1,469
Recorded Investment		1,170,954	1,212,288
HELOC
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		212,441	211,415
Accrued Interest Receivable		853	769
Recorded Investment		213,294	212,184
Installment
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		19,874	22,638
Accrued Interest Receivable		67	78
Recorded Investment		19,941	22,716
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		1,120,850	967,111
Accrued Interest Receivable		3,385	3,032
Recorded Investment		1,124,235	970,143
Leases
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		3,243	2,856
Accrued Interest Receivable		29	14
Recorded Investment		3,272	2,870
Financing Receivable With No Related Allowance Recorded [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		41,075	32,583
Impaired Financing Receivable, Recorded Investment		19,965	18,763
Financing Receivable With No Related Allowance Recorded [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		23,961	15,138
Impaired Financing Receivable, Recorded Investment		23,474	14,916
Financing Receivable With No Related Allowance Recorded [Member] | SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance			10,834
Impaired Financing Receivable, Recorded Investment			2,044
Financing Receivable With No Related Allowance Recorded [Member] | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		3,662	2,506
Impaired Financing Receivable, Recorded Investment		2,226	1,531
Financing Receivable With No Related Allowance Recorded [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		24,409	23,798
Impaired Financing Receivable, Recorded Investment		22,687	23,480
Financing Receivable With Related Allowance Recorded [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		810	16,155
Impaired Financing Receivable, Recorded Investment		659	11,832
Impaired Financing Receivable, Related Allowance		152	1,904
Financing Receivable With Related Allowance Recorded [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		1,014	3,195
Impaired Financing Receivable, Recorded Investment		1,000	3,109
Impaired Financing Receivable, Related Allowance		309	381
Financing Receivable With Related Allowance Recorded [Member] | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance			3,145
Impaired Financing Receivable, Recorded Investment			3,145
Impaired Financing Receivable, Related Allowance			1,356
Financing Receivable With Related Allowance Recorded [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Unpaid Principal Balance		427	1,951
Impaired Financing Receivable, Recorded Investment		415	1,844
Impaired Financing Receivable, Related Allowance		$ 87	$ 550
[1]	Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class.

Loans - Recorded Investment in

Loans - Recorded Investment in Nonaccrual, Restructured and Loans Past Due 90 Days or More and Accruing (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 70,426	$ 80,664	$ 73,712
Nonaccrual Loans	87,822	95,887
Accruing Troubled Debt Restructurings	18,228	25,088
Loans Past Due 90 Days or More and Accruing	2,138	1,975
Total Nonperforming Loans	108,188	122,950
Impaired Financing Receivable, Average Recorded Investment	79,496	70,762	92,614
Impaired Financing Receivable, Interest Income, Cash Basis Method	4,777	1,963	2,678
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	20,624	30,595	19,106
Nonaccrual Loans	20,057	21,676
Accruing Troubled Debt Restructurings	600	8,947
Loans Past Due 90 Days or More and Accruing	15	0
Total Nonperforming Loans	20,672	30,623
Impaired Financing Receivable, Average Recorded Investment	26,821	20,179	19,518
Impaired Financing Receivable, Interest Income, Cash Basis Method	885	340	360
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	24,474	18,025	21,989
Nonaccrual Loans	19,169	15,268
Accruing Troubled Debt Restructurings	5,305	2,757
Loans Past Due 90 Days or More and Accruing	0	0
Total Nonperforming Loans	24,474	18,025
Impaired Financing Receivable, Average Recorded Investment	22,828	17,883	31,945
Impaired Financing Receivable, Interest Income, Cash Basis Method	884	550	1,027
SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		2,044	2,078
Nonaccrual Loans	0	2,044
Accruing Troubled Debt Restructurings	0	0
Loans Past Due 90 Days or More and Accruing	0	0
Total Nonperforming Loans	0	2,044
Impaired Financing Receivable, Average Recorded Investment	1,597	2,066	3,658
Impaired Financing Receivable, Interest Income, Cash Basis Method		21	146
Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	2,226	4,676	5,609
Nonaccrual Loans	1,833	4,162
Accruing Troubled Debt Restructurings	393	514
Loans Past Due 90 Days or More and Accruing	0	0
Total Nonperforming Loans	2,226	4,676
Impaired Financing Receivable, Average Recorded Investment	3,906	5,666	8,784
Impaired Financing Receivable, Interest Income, Cash Basis Method	66	26	61
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	0	7
Accruing Troubled Debt Restructurings	104	110
Loans Past Due 90 Days or More and Accruing	0	0
Total Nonperforming Loans	104	117
Installment
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	61	64
Accruing Troubled Debt Restructurings	95	114
Loans Past Due 90 Days or More and Accruing	12	0
Total Nonperforming Loans	168	178
Commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	23,102	25,324	24,930
Nonaccrual Loans	23,013	25,063
Accruing Troubled Debt Restructurings	89	261
Loans Past Due 90 Days or More and Accruing	0	0
Total Nonperforming Loans	23,102	25,324
Impaired Financing Receivable, Average Recorded Investment	24,341	24,968	28,306
Impaired Financing Receivable, Interest Income, Cash Basis Method	2,942	1,026	1,084
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	18,313	20,378
Accruing Troubled Debt Restructurings	9,612	10,143
Loans Past Due 90 Days or More and Accruing	887	851
Total Nonperforming Loans	28,812	31,372
HELOC
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	1,783	1,749
Accruing Troubled Debt Restructurings	673	873
Loans Past Due 90 Days or More and Accruing	25	27
Total Nonperforming Loans	2,481	2,649
Installment
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	644	1,657
Accruing Troubled Debt Restructurings	609	635
Loans Past Due 90 Days or More and Accruing	60	4
Total Nonperforming Loans	1,313	2,296
Consumer
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	2,949	3,819
Accruing Troubled Debt Restructurings	748	734
Loans Past Due 90 Days or More and Accruing	1,139	1,093
Total Nonperforming Loans	4,836	$ 5,646
Impaired Financing Receivable, Average Recorded Investment	$ 3		$ 403

Loans - Loans Individually and

Loans - Loans Individually and Collectively Evaluated for Impairment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	$ 106,050	$ 120,975
Loans individually evaluated for impairment	70,426	80,664
Loans collectively evaluated for impairment	35,624	40,311
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	20,657	30,623
Loans individually evaluated for impairment	20,624	30,595
Loans collectively evaluated for impairment	33	28
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	24,474	18,025
Loans individually evaluated for impairment	24,474	18,025
Loans collectively evaluated for impairment	0	0
SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	0	2,044
Loans individually evaluated for impairment	0	2,044
Loans collectively evaluated for impairment	0	0
Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	2,226	4,676
Loans individually evaluated for impairment	2,226	4,676
Loans collectively evaluated for impairment	0	0
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	104	117
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	104	117
Installment
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	156	178
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	156	178
Commercial
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	23,102	25,324
Loans individually evaluated for impairment	23,102	25,324
Loans collectively evaluated for impairment	0	0
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	27,925	30,521
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	27,925	30,521
HELOC
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	2,456	2,622
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	2,456	2,622
Installment
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	1,253	2,292
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	1,253	2,292
Consumer
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	3,697	4,553
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	$ 3,697	$ 4,553

Loans - Loans Individually Eva

Loans - Loans Individually Evaluated for Impairment by Class of Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	$ 95,358	$ 109,305
Recorded investment	70,426	80,664	$ 73,712
Allowance for loan losses allocated	548	4,191
Impaired Financing Receivable, Average Recorded Investment	79,496	70,762	92,614
Impaired Financing Receivable, Interest Income, Cash Basis Method	4,777	1,963	2,678
Commercial, financial and agricultural
Financing Receivable, Impaired [Line Items]
Recorded investment	20,624	30,595	19,106
Impaired Financing Receivable, Average Recorded Investment	26,821	20,179	19,518
Impaired Financing Receivable, Interest Income, Cash Basis Method	885	340	360
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded investment	24,474	18,025	21,989
Impaired Financing Receivable, Average Recorded Investment	22,828	17,883	31,945
Impaired Financing Receivable, Interest Income, Cash Basis Method	884	550	1,027
Remaining commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	2,226	4,676	5,609
Impaired Financing Receivable, Average Recorded Investment	3,906	5,666	8,784
Impaired Financing Receivable, Interest Income, Cash Basis Method	66	26	61
Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	23,102	25,324	24,930
Impaired Financing Receivable, Average Recorded Investment	24,341	24,968	28,306
Impaired Financing Receivable, Interest Income, Cash Basis Method	2,942	1,026	1,084
Consumer
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment	3		403
Construction Real Estate Vision Commercial Land And Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment		2,044	2,078
Impaired Financing Receivable, Average Recorded Investment	1,597	2,066	3,658
Impaired Financing Receivable, Interest Income, Cash Basis Method		21	$ 146
With no related allowance recorded | Commercial, financial and agricultural
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	41,075	32,583
Recorded investment	19,965	18,763
With no related allowance recorded | Commercial real estate
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	23,961	15,138
Recorded investment	23,474	14,916
With no related allowance recorded | SEPH commercial land and development
Financing Receivable, Impaired [Line Items]
Unpaid principal balance		10,834
Recorded investment		2,044
With no related allowance recorded | Remaining commercial
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	3,662	2,506
Recorded investment	2,226	1,531
With no related allowance recorded | Commercial
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	24,409	23,798
Recorded investment	$ 22,687	$ 23,480

Loans - Average Recorded Inves

Loans - Average Recorded Investment and Interest Income Recognized on Loans Individually Evaluated for Impairment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Recorded investment	$ 70,426	$ 80,664	$ 73,712
Average recorded investment	79,496	70,762	92,614
Interest income recognized	4,777	1,963	2,678
Commercial, financial and agricultural
Financing Receivable, Impaired [Line Items]
Recorded investment	20,624	30,595	19,106
Average recorded investment	26,821	20,179	19,518
Interest income recognized	885	340	360
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded investment	24,474	18,025	21,989
Average recorded investment	22,828	17,883	31,945
Interest income recognized	884	550	1,027
SEPH commercial land and development
Financing Receivable, Impaired [Line Items]
Recorded investment		2,044	2,078
Average recorded investment	1,597	2,066	3,658
Interest income recognized		21	146
Remaining commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	2,226	4,676	5,609
Average recorded investment	3,906	5,666	8,784
Interest income recognized	66	26	61
Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	23,102	25,324	24,930
Average recorded investment	24,341	24,968	28,306
Interest income recognized	2,942	$ 1,026	1,084
Consumer
Financing Receivable, Impaired [Line Items]
Average recorded investment	$ 3		$ 403

Loans - Aging of Recorded Inve

Loans - Aging of Recorded Investment in Past Due Loans(Details) - USD ($) $ in Thousands		Dec. 31, 2016		Dec. 31, 2015
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		$ 26,591		$ 24,505
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)		24,050	[1]	42,383	[2]
Total past due		50,641		66,888
Total current (2)		5,236,189		5,015,436
Recorded Investment		5,286,830		5,082,324
Commercial, financial and agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		371		670
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)		4,113	[1]	7,536	[2]
Total past due		4,484		8,206
Total current (2)		993,693		950,958
Recorded Investment	[3]	998,177		959,164
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		355		142
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)		2,499	[1]	530	[2]
Total past due		2,854		672
Total current (2)		1,157,010		1,116,940
Recorded Investment	[3]	1,159,864		1,117,612
Construction real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment		189,466		173,762
SEPH commercial land and development
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)	[2]			2,044
Total past due				2,044
Recorded Investment				2,044
Remaining commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days				165
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)		541	[1]	84	[2]
Total past due		541		249
Total current (2)		135,200		128,118
Recorded Investment		135,741		128,367
Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		559		63
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)	[2]			7
Total past due		559		70
Total current (2)		48,246		36,727
Recorded Investment		48,805		36,797
Installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		223		200
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)		64	[1]	46	[2]
Total past due		287		246
Total current (2)		4,633		6,308
Recorded Investment		4,920		6,554
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		330		325
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)		3,631	[1]	19,521	[2]
Total past due		3,961		19,846
Total current (2)		403,666		391,739
Recorded Investment		407,627		411,585
Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		10,854		10,569
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)		9,769	[1]	8,735	[2]
Total past due		20,623		19,304
Total current (2)		1,150,331		1,192,984
Recorded Investment		1,170,954		1,212,288
HELOC
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		970		487
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)		1,020	[1]	186	[2]
Total past due		1,990		673
Total current (2)		211,304		211,511
Recorded Investment		213,294		212,184
Installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		350		426
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)		319	[1]	318	[2]
Total past due		669		744
Total current (2)		19,272		21,972
Recorded Investment		19,941		22,716
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		12,579		11,458
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)		2,094	[1]	3,376	[2]
Total past due		14,673		14,834
Total current (2)		1,109,562		955,309
Recorded Investment		1,124,235		970,143
Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total current (2)		3,272		2,870
Recorded Investment		$ 3,272		$ 2,870
[1]	(1) Includes an aggregate of $2.1 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans.(2) Includes an aggregate of $65.9 million of nonaccrual loans which are current in regards to contractual principal and interest payments.
[2]	(1) Includes an aggregate of $2.0 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans.(2) Includes an aggregate of $55.5 million of nonaccrual loans which are current in regards to contractual principal and interest payments.
[3]	Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class.

Loans - Recorded Investment by

Loans - Recorded Investment by Loan Grade (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 5,271,857	$ 5,068,085	$ 4,829,682
Five Rated [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total loans	5,826	4,392
Five Rated [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	7,548	14,880
Five Rated [Member] | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	287	2,151
Five Rated [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,055	3,280
Five Rated [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	14,716	24,703
Six Rated [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total loans		347
Six Rated [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	190	3,417
Six Rated [Member] | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	118	122
Six Rated [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	124	386
Six Rated [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	432	4,272
Impaired [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total loans	20,657	30,623
Impaired [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	24,474	18,025
Impaired [Member] | SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Total loans		2,044
Impaired [Member] | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,226	4,676
Impaired [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	23,102	25,324
Impaired [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	70,459	80,692
Pass [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total loans	971,694	923,802
Pass [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,127,652	1,081,290
Pass [Member] | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	133,110	121,418
Pass [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	383,346	382,595
Pass [Member] | Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,272	2,870
Pass [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,619,074	2,511,975
Recorded Investment [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total loans	998,177	959,164
Recorded Investment [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,159,864	1,117,612
Recorded Investment [Member] | SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Total loans		2,044
Recorded Investment [Member] | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	135,741	128,367
Recorded Investment [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	407,627	411,585
Recorded Investment [Member] | Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,272	2,870
Recorded Investment [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 2,704,681	$ 2,621,642

Loans - TDR Number of Contract

Loans - TDR Number of Contracts Modified And Recorded Investment (Details)	12 Months Ended
	Dec. 31, 2016USD ($)contracts	Dec. 31, 2015USD ($)contracts	Dec. 31, 2014USD ($)contracts
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	97	67	86
Recorded Investment	$ 3,798,000	$ 2,854,000	$ 2,009,000
Number of Contracts | contracts	405	424	450
Total Recorded Investment Modified as TDRs During Period	$ 21,258,000	$ 23,324,000	$ 8,395,000
Leases
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	0	0
Recorded Investment	$ 0
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	7	1	4
Recorded Investment	$ 419,000	$ 1,000	$ 206,000
Number of Contracts | contracts	32	39	30
Total Recorded Investment Modified as TDRs During Period	$ 8,641,000	$ 12,588,000	$ 723,000
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	5	1	1
Recorded Investment	$ 843,000	$ 626,000	$ 302,000
Number of Contracts | contracts	14	14	11
Total Recorded Investment Modified as TDRs During Period	$ 6,381,000	$ 4,160,000	$ 2,438,000
SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0
SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	0	0
Number of Contracts | contracts		0	0
Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	0	0
Number of Contracts | contracts	2	2	2
Total Recorded Investment Modified as TDRs During Period	$ 1,143,000	$ 513,000	$ 206,000
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	0	0
Recorded Investment	$ 0
Number of Contracts | contracts	0	1	0
Total Recorded Investment Modified as TDRs During Period		$ 19,000
Installment
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	0	0
Recorded Investment	$ 0
Number of Contracts | contracts	1	0	2
Total Recorded Investment Modified as TDRs During Period			$ 56,000
Commercial
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	7	3	1
Recorded Investment	$ 848,000	$ 1,005,000	$ 3,000
Number of Contracts | contracts	11	11	9
Total Recorded Investment Modified as TDRs During Period	$ 1,122,000	$ 1,185,000	$ 866,000
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	15	12	14
Recorded Investment	$ 1,201,000	$ 682,000	$ 810,000
Number of Contracts | contracts	34	39	46
Total Recorded Investment Modified as TDRs During Period	$ 2,406,000	$ 3,254,000	$ 2,357,000
HELOC
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	1	2
Recorded Investment		$ 5,000	$ 160,000
Number of Contracts | contracts	13	26	10
Total Recorded Investment Modified as TDRs During Period	$ 282,000	$ 360,000	$ 326,000
Installment
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	1	2	2
Recorded Investment	$ 3,000	$ 101,000	$ 12,000
Number of Contracts | contracts	5	9	10
Total Recorded Investment Modified as TDRs During Period	$ 105,000	$ 155,000	$ 121,000
Consumer
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	293	283	330
Total Recorded Investment Modified as TDRs During Period	$ 1,178,000	$ 1,090,000	$ 1,302,000
Accruing
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	111,000	44,000	314,000
Total Recorded Investment Modified as TDRs During Period	4,628,000	11,766,000	1,946,000
Accruing | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	191,000	8,948,000	292,000
Accruing | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	3,844,000	637,000	1,184,000
Accruing | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period		513,000
Accruing | Mortgage
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	0	19,000	0
Accruing | Installment
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	0	0	0
Accruing | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	89,000
Accruing | Mortgage
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	114,000	1,132,000	32,000
Accruing | HELOC
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	104,000	315,000	85,000
Accruing | Installment
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	102,000		109,000
Accruing | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	184,000	202,000	244,000
Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	3,700,000	2,800,000	1,700,000
Total Recorded Investment Modified as TDRs During Period	16,630,000	11,558,000	6,449,000
Nonaccrual | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	8,450,000	3,640,000	431,000
Nonaccrual | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	2,537,000	3,523,000	1,254,000
Nonaccrual | Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	1,143,000		206,000
Nonaccrual | Installment
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period			56,000
Nonaccrual | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	1,033,000	1,185,000	866,000
Nonaccrual | Mortgage
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	2,292,000	2,122,000	2,325,000
Nonaccrual | HELOC
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	178,000	45,000	241,000
Nonaccrual | Installment
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	3,000	155,000	12,000
Nonaccrual | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	$ 994,000	$ 888,000	$ 1,058,000

Loans - Recorded Investment 77

Loans - Recorded Investment in Financing Receivable Modified as TDR Within 12 Month (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)contracts	Dec. 31, 2015USD ($)contracts	Dec. 31, 2014USD ($)contracts
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	97	67	86
Recorded Investment | $	$ 3,798	$ 2,854	$ 2,009
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	7	1	4
Recorded Investment | $	$ 419	$ 1	$ 206
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	5	1	1
Recorded Investment | $	$ 843	$ 626	$ 302
SEPH commercial land and development
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	0	0	0
Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	0	0	0
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	0	0	0
Recorded Investment | $	$ 0
Installment
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	0	0	0
Recorded Investment | $	$ 0
Commercial
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	7	3	1
Recorded Investment | $	$ 848	$ 1,005	$ 3
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	15	12	14
Recorded Investment | $	$ 1,201	$ 682	$ 810
HELOC
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	0	1	2
Recorded Investment | $		$ 5	$ 160
Installment
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	1	2	2
Recorded Investment | $	$ 3	$ 101	$ 12
Leases
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	62	47	62
Recorded Investment | $	$ 484	$ 434	$ 516

Allowance for Loan Losses - Al

Allowance for Loan Losses - Allowance Calculation at the Segment Level and Adjusted Beginning Balance for the Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	$ 3,800
Allowance for Loan and Lease Losses, Reserve Estimate Methodology, Historical Loss Period Factor		84 months
Beginning balance		$ 56,494	$ 54,352
Charge-offs		20,799	14,290	$ 24,780
Recoveries		(20,030)	(11,442)	(26,997)
Net charge-offs (recoveries)		769	2,848	(2,217)
Provision (Recovery)		(5,101)	4,990	(7,333)
Ending balance		50,624	56,494	54,352
Commercial, financial and agricultural
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance		13,694	10,719
Charge-offs		5,786	2,478	3,779
Recoveries		(1,259)	(1,373)	(1,003)
Net charge-offs (recoveries)		4,527	1,105	2,776
Provision (Recovery)		4,267	4,080	(723)
Ending balance			13,694	10,719
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance		9,197	8,808
Charge-offs		412	348	8,003
Recoveries		(3,671)	(2,241)	(7,759)
Net charge-offs (recoveries)		(3,259)	(1,893)	244
Provision (Recovery)		(2,024)	(1,504)	(6,847)
Ending balance			9,197	8,808
Construction real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance		8,564	8,652
Charge-offs		1,436	470	1,316
Recoveries		(8,559)	(2,092)	(12,572)
Net charge-offs (recoveries)		(7,123)	(1,622)	(11,256)
Provision (Recovery)		(10,440)	(1,710)	(9,459)
Ending balance			8,564	8,652
Residential real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance		13,514	14,772
Charge-offs		3,014	2,352	3,944
Recoveries		(2,446)	(2,438)	(2,985)
Net charge-offs (recoveries)		568	(86)	959
Provision (Recovery)		(1,988)	(1,344)	1,480
Ending balance			13,514	14,772
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance		11,524	11,401
Charge-offs		10,151	8,642	7,738
Recoveries		(4,094)	(3,295)	(2,671)
Net charge-offs (recoveries)		6,057	5,347	5,067
Provision (Recovery)		5,086	5,470	8,223
Ending balance			11,524	11,401
Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance		1	0
Charge-offs		0	0	0
Recoveries		(1)	(3)	(7)
Net charge-offs (recoveries)		(1)	(3)	(7)
Provision (Recovery)		$ (2)	(2)	(7)
Ending balance			$ 1	$ 0

Allowance for Loan Losses - Co

Allowance for Loan Losses - Composition of the Allowance for Loan Losses (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance		$ 50,624	$ 56,494	$ 54,352	$ 59,468
Ending allowance balance attributed to loans
Individually evaluated for impairment		548	4,191
Collectively evaluated for impairment		50,076	52,303
Total ending allowance balance		50,624	56,494
Loan Balance:
Loans individually evaluated for impairment		70,415	80,599
Loans collectively evaluated for impairment		5,201,442	4,987,486
Total ending loan balance		$ 5,271,857	$ 5,068,085
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment		0.78%	5.20%
Loans collectively evaluated for impairment		0.96%	1.05%
Total		0.96%	1.11%
Recorded Investment:
Loans individually evaluated for impairment		$ 70,426	$ 80,664
Loans collectively evaluated for impairment		5,216,404	5,001,660
Recorded Investment		5,286,830	5,082,324
Financing Receivable, Allowance for Credit Losses, Write-downs		20,799	14,290	24,780
Financing Receivable, Allowance for Credit Losses, Recovery		(20,030)	(11,442)	(26,997)
Financing Receivables Allowance For Credit Losses Net Charge Offs		769	2,848	(2,217)
Provision for Loan, Lease, and Other Losses		(5,101)	4,990	(7,333)
Commercial, financial and agricultural
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance			13,694	10,719	14,218
Ending allowance balance attributed to loans
Individually evaluated for impairment		152	1,904
Collectively evaluated for impairment		13,282	11,790
Total ending allowance balance		13,434	13,694
Loan Balance:
Loans individually evaluated for impairment		20,622	30,545
Loans collectively evaluated for impairment		973,997	925,182
Total ending loan balance	[1]	$ 994,619	$ 955,727
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment		0.74%	6.23%
Loans collectively evaluated for impairment		1.36%	1.27%
Total		1.35%	1.43%
Recorded Investment:
Loans individually evaluated for impairment		$ 20,624	$ 30,595
Loans collectively evaluated for impairment		977,553	928,569
Recorded Investment	[1]	998,177	959,164
Financing Receivable, Allowance for Credit Losses, Write-downs		5,786	2,478	3,779
Financing Receivable, Allowance for Credit Losses, Recovery		(1,259)	(1,373)	(1,003)
Financing Receivables Allowance For Credit Losses Net Charge Offs		4,527	1,105	2,776
Provision for Loan, Lease, and Other Losses		4,267	4,080	(723)
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance			9,197	8,808	15,899
Ending allowance balance attributed to loans
Individually evaluated for impairment		309	381
Collectively evaluated for impairment		10,123	8,816
Total ending allowance balance		10,432	9,197
Loan Balance:
Loans individually evaluated for impairment		24,465	18,015
Loans collectively evaluated for impairment		1,131,238	1,095,588
Total ending loan balance	[1]	$ 1,155,703	$ 1,113,603
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment		1.26%	2.11%
Loans collectively evaluated for impairment		0.89%	0.80%
Total		0.90%	0.83%
Recorded Investment:
Loans individually evaluated for impairment		$ 24,474	$ 18,025
Loans collectively evaluated for impairment		1,135,390	1,099,587
Recorded Investment	[1]	1,159,864	1,117,612
Financing Receivable, Allowance for Credit Losses, Write-downs		412	348	8,003
Financing Receivable, Allowance for Credit Losses, Recovery		(3,671)	(2,241)	(7,759)
Financing Receivables Allowance For Credit Losses Net Charge Offs		(3,259)	(1,893)	244
Provision for Loan, Lease, and Other Losses		(2,024)	(1,504)	(6,847)
Construction real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance			8,564	8,652	6,855
Ending allowance balance attributed to loans
Individually evaluated for impairment		0	1,356
Collectively evaluated for impairment		5,247	7,208
Total ending allowance balance		5,247	8,564
Loan Balance:
Loans individually evaluated for impairment		2,226	6,716
Loans collectively evaluated for impairment		186,719	166,629
Total ending loan balance		$ 188,945	$ 173,345
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment		0.00%	20.19%
Loans collectively evaluated for impairment		2.81%	4.33%
Total		2.78%	4.94%
Recorded Investment:
Loans individually evaluated for impairment		$ 2,226	$ 6,720
Loans collectively evaluated for impairment		187,240	167,042
Recorded Investment		189,466	173,762
Financing Receivable, Allowance for Credit Losses, Write-downs		1,436	470	1,316
Financing Receivable, Allowance for Credit Losses, Recovery		(8,559)	(2,092)	(12,572)
Financing Receivables Allowance For Credit Losses Net Charge Offs		(7,123)	(1,622)	(11,256)
Provision for Loan, Lease, and Other Losses		(10,440)	(1,710)	(9,459)
Residential real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance			13,514	14,772	14,251
Ending allowance balance attributed to loans
Individually evaluated for impairment		87	550
Collectively evaluated for impairment		10,871	12,964
Total ending allowance balance		10,958	13,514
Loan Balance:
Loans individually evaluated for impairment		23,102	25,323
Loans collectively evaluated for impairment		1,785,395	1,830,120
Total ending loan balance		$ 1,808,497	$ 1,855,443
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment		0.38%	2.17%
Loans collectively evaluated for impairment		0.61%	0.71%
Total		0.61%	0.73%
Recorded Investment:
Loans individually evaluated for impairment		$ 23,102	$ 25,324
Loans collectively evaluated for impairment		1,788,714	1,833,449
Recorded Investment		1,811,816	1,858,773
Financing Receivable, Allowance for Credit Losses, Write-downs		3,014	2,352	3,944
Financing Receivable, Allowance for Credit Losses, Recovery		(2,446)	(2,438)	(2,985)
Financing Receivables Allowance For Credit Losses Net Charge Offs		568	(86)	959
Provision for Loan, Lease, and Other Losses		(1,988)	(1,344)	1,480
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance			11,524	11,401	8,245
Ending allowance balance attributed to loans
Individually evaluated for impairment		0	0
Collectively evaluated for impairment		10,553	11,524
Total ending allowance balance		10,553	11,524
Loan Balance:
Loans individually evaluated for impairment		0	0
Loans collectively evaluated for impairment		1,120,850	967,111
Total ending loan balance		$ 1,120,850	$ 967,111
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment		0.00%	0.00%
Loans collectively evaluated for impairment		0.94%	1.19%
Total		0.94%	1.19%
Recorded Investment:
Loans individually evaluated for impairment		$ 0	$ 0
Loans collectively evaluated for impairment		1,124,235	970,143
Recorded Investment		1,124,235	970,143
Financing Receivable, Allowance for Credit Losses, Write-downs		10,151	8,642	7,738
Financing Receivable, Allowance for Credit Losses, Recovery		(4,094)	(3,295)	(2,671)
Financing Receivables Allowance For Credit Losses Net Charge Offs		6,057	5,347	5,067
Provision for Loan, Lease, and Other Losses		5,086	5,470	8,223
Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance			1	0	$ 0
Ending allowance balance attributed to loans
Individually evaluated for impairment		0	0
Collectively evaluated for impairment		0	1
Total ending allowance balance		0	1
Loan Balance:
Loans individually evaluated for impairment		0	0
Loans collectively evaluated for impairment		3,243	2,856
Total ending loan balance		$ 3,243	$ 2,856
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%	0.04%
Total		0.00%	0.04%
Recorded Investment:
Loans individually evaluated for impairment		$ 0	$ 0
Loans collectively evaluated for impairment		3,272	2,870
Recorded Investment		3,272	2,870
Financing Receivable, Allowance for Credit Losses, Write-downs		0	0	0
Financing Receivable, Allowance for Credit Losses, Recovery		(1)	(3)	(7)
Financing Receivables Allowance For Credit Losses Net Charge Offs		(1)	(3)	(7)
Provision for Loan, Lease, and Other Losses		$ (2)	$ (2)	$ (7)
[1]	Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class.

Loans Held for Sale Narrative (

Loans Held for Sale Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Loans Held for Sale [Line Items]
Disposal Group, Including Discontinued Operation, Mortgage Loans	$ 10,413,000	$ 7,306,000
Loans Held-for-sale, Mortgages, Contractual Balance	10,300,000	7,200,000
Expected Gain (Loss) on Sale of Mortgage Loans	131,000	95,000
Commercial Portfolio Segment [Member]
Loans Held for Sale [Line Items]
Loans held for sale - lower of cost or market	$ 0	144,000	$ 22,000,000
Gain (Loss) on Sale of Loans and Leases		$ 800,000	$ 1,900,000

Other Real Estate Owned (Detail

Other Real Estate Owned (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Assets Repossessed or Foreclosed, or loans in process of foreclosure [Line Items]
Other Real Estate, Foreclosed Assets, and Repossessed Assets	$ 13,926	$ 18,651
Construction real estate
Schedule of Assets Repossessed or Foreclosed, or loans in process of foreclosure [Line Items]
Other Real Estate, Foreclosed Assets, and Repossessed Assets	4,624	7,259
Commercial Real Estate [Member]
Schedule of Assets Repossessed or Foreclosed, or loans in process of foreclosure [Line Items]
Other Real Estate, Foreclosed Assets, and Repossessed Assets	7,642	8,333
Residential real estate
Schedule of Assets Repossessed or Foreclosed, or loans in process of foreclosure [Line Items]
Other Real Estate, Foreclosed Assets, and Repossessed Assets	1,660	3,059
Mortgage Loans in Process of Foreclosure, Amount	$ 3,250	$ 2,021

Premises And Equipment - Narra

Premises And Equipment - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$ 8.4	$ 7.3	$ 7.2
Rent expense	$ 2.1	$ 1.7	$ 1.7

Premises And Equipment - Major

Premises And Equipment - Major Categories of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Premises and Equipment, Gross	$ 151,168	$ 145,365
Less accumulated depreciation	(93,197)	(85,872)
Premises and equipment, net	57,971	59,493
Land
Property, Plant and Equipment [Line Items]
Premises and Equipment, Gross	19,577	19,123
Buildings
Property, Plant and Equipment [Line Items]
Premises and Equipment, Gross	75,472	74,525
Equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Premises and Equipment, Gross	52,719	47,839
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and Equipment, Gross	$ 3,400	$ 3,878

Premises And Equipment - Schedu

Premises And Equipment - Schedule of Future Minimum Rental Payments Under Operating Leases (Details) $ in Thousands	Dec. 31, 2016USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2,017	$ 1,508
2,018	1,269
2,019	1,178
2,020	621
2,021	422
Thereafter	700
Total	$ 5,698

Investment in Qualified Affor85

Investment in Qualified Affordable Housing (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity investments	$ 3,500	$ 0
Amortization Method Qualified Affordable Housing Project Investments, Amortization	7,300	6,700	$ 6,900
Affordable Housing Tax Credits and Other Tax Benefits, Amount	9,400	8,900	$ 8,800
Affordable Housing Program Obligation	14,282	20,311
Qualified Affordable Housing [Domain]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity investments	$ 52,947	$ 51,247

Deposits - Narrative (Details)

Deposits - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Deposits [Abstract]
Deposits received from executive officers, directors, and their related interests	$ 26.5	$ 21.6
Time Deposits, $250,000 or more	$ 43.3	$ 49.7

Deposits - Summary of Noninter

Deposits - Summary of Noninterest Bearing and Interest Bearing Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deposits [Abstract]
Non-interest bearing	$ 1,523,417	$ 1,404,032
Interest bearing	3,998,539	3,943,610
Total deposits	$ 5,521,956	$ 5,347,642	$ 5,128,000

Deposits - Time Deposits (Deta

Deposits - Time Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deposits [Abstract]
Time Deposits, $250,000 or more	$ 43,300	$ 49,700
Time Deposits, Fiscal Year Maturity [Abstract]
2,017	717,879
2,018	131,236
2,019	153,257
2,020	63,758
2,021	51,245
After 5 years	495
Total	$ 1,117,870

Repurchase Agreements (Details)

Repurchase Agreements (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Nov. 30, 2012
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
ERROR in label resolution.	$ 640,000	$ 583,000
Pledged Assets Separately Reported, Securities Pledged for Repurchase Agreements, at Fair Value	569,000	622,000
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	509,795	554,242
Maturity Greater than 90 Days [Member]
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	301,104	304,385
Maturity 30 to 90 Days [Member]
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	0	0
Maturity Less than 30 Days [Member]
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	0	2,239
Maturity Overnight [Member]
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	$ 208,691	$ 247,618
Long-term Debt [Member]
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount			$ 300,000

Short-Term Borrowings - Narrat

Short-Term Borrowings - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Short-term Debt [Line Items]
Money Pledged as Collateral for FHLB Advance Borrowings	$ 25	$ 21
FHLB Advances
Short-term Debt [Line Items]
Commercial real estate and residential mortgage loans pledged under blanket agreement	$ 1,909	$ 1,985

Short-Term Borrowings - Schedu

Short-Term Borrowings - Schedule of Short-Term Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Short-term Debt [Line Items]
Securities sold under agreements to repurchase	$ 209,795	$ 254,242
FHLB advances	185,000	140,000
Total short-term borrowings	394,795	394,242
Repurchase agreements
Short-term Debt [Line Items]
Total short-term borrowings	209,795	254,242
Highest month-end balance	248,277	278,324
Average daily balance	$ 224,763	$ 257,622
Weighted-average interest rate:
As of year-end	0.17%	0.17%
Paid during the year	0.16%	0.18%
FHLB Advances
Short-term Debt [Line Items]
Total short-term borrowings	$ 185,000	$ 140,000
Highest month-end balance	185,000	140,000
Average daily balance	$ 15,694	$ 1,096
Weighted-average interest rate:
As of year-end	0.80%	0.56%
Paid during the year	0.63%	0.59%

Long-Term Debt - Narrative (De

Long-Term Debt - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Nov. 30, 2012
Debt Instrument [Line Items]
Prepayment penalty on long-term debt	$ 5,554	$ 532	$ 0
Gains (Losses) on Restructuring of Debt	5,600	500	3,200
Amortization of prepayment penalty on long term debt	6,176	6,047	5,031
Prepayment Penalty, Future Amortization Expense [Abstract]
Long-term debt with contractual maturity longer than five years	100,000	150,000
Money Pledged as Collateral for FHLB Advance Borrowings	25,000	21,000
FHLB Debt Prepaid	$ 50,000	$ 54,500
FHLB Debt Prepaid Weighted Avg Rate	3150.00%	1.59%
FHLB Debt Amount Restructured			$ 50,000
Broker Repurchase Agreements
Debt Instrument [Line Items]
Debt repurchased during period				$ 300,000
Debt repurchased during period, rate				1.75%
Prepayment penalty on long-term debt	$ 25,000
Effective interest rate percentage	3.55%
Prepayment Penalty, Future Amortization Expense [Abstract]
Payments of Debt Extinguishment Costs, Amount to be Amortized in Year Two	$ 4,700
Payments of Debt Extinguishment Costs, Amount to be Amortized in Year Three	$ 4,700
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]
Debt Instrument [Line Items]
Debt repurchased during period, rate				1.25%
Effective interest rate percentage	3.52%
Prepayment Penalty, Future Amortization Expense [Abstract]
Payments of Debt Extinguishment Costs, Amount to be Amortized in Year Two	$ 1,000
Payments of Debt Extinguishment Costs, Amount to be Amortized in Year Three	$ 1,000

Long-Term Debt - Schedule of l

Long-Term Debt - Schedule of long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Long-term Debt, Fiscal Year Maturity [Abstract]
2,017	$ 350,000
2,018	150,000	$ 350,000
2,019	75,000	150,000
2,020	25,000	75,000
2,021	0	25,000
2,021		0
Thereafter	100,000	150,000
Total long-term debt, excluding prepayment penalty	700,000	750,000
Prepayment penalty	(5,719)	(11,895)
Total long-term debt	$ 694,281	$ 738,105
Long-term Debt, Fiscal Year Maturity, Average Rate [Abstract] [Abstract]
2,017	1.68%
2,018	2.04%	1.68%
2,019	1.96%	2.04%
2,020	2.14%	1.96%
2,021	0.00%	2.14%
2,021		0.00%
Long-term Debt, Maturities, Repayments of Principal after Year Five	$ 100,000
Thereafter		3.32%
Average rate, total, excluding prepayment penalty	2.05%	2.12%
Average rate, total	2.07%	2.16%
Long Term Debt Maturities Average Rate In After Year Five	3.40%
FHLB Advances
Long-term Debt, Fiscal Year Maturity [Abstract]
2,017	$ 50,000
2,018	150,000	$ 50,000
2,019	75,000	150,000
2,020	25,000	75,000
2,021	0	25,000
2,021		0
Thereafter		150,000
Total long-term debt, excluding prepayment penalty	$ 400,000	$ 450,000
Long-term Debt, Fiscal Year Maturity, Average Rate [Abstract] [Abstract]
2,017	1.25%
2,018	2.04%	1.25%
2,019	1.96%	2.04%
2,020	2.14%	1.96%
2,021	0.00%	2.14%
2,021		0.00%
Long-term Debt, Maturities, Repayments of Principal after Year Five	$ 100,000
Thereafter		3.32%
Average rate, total, excluding prepayment penalty	2.27%	2.37%
Long Term Debt Maturities Average Rate In After Year Five	3.40%
Broker Repurchase Agreements
Long-term Debt, Fiscal Year Maturity [Abstract]
2,019	$ 300,000
2,020		$ 300,000
Total long-term debt, excluding prepayment penalty	$ 300,000	$ 300,000
Long-term Debt, Fiscal Year Maturity, Average Rate [Abstract] [Abstract]
2,019	1.75%
2,020		1.75%
Average rate, total, excluding prepayment penalty	1.75%	1.75%

Subordinated Debentures_Notes (

Subordinated Debentures/Notes (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Apr. 20, 2012USD ($)purchaser	Dec. 23, 2009purchaser
Subordinated notes	$ 45,000	$ 45,000
Number of purchasers | purchaser				38
Trust I
Preferred securities issued	15,000
Junior subordinated notes
Junior subordinated debt purchased by Trust I	$ 15,500
Trust preferred securities
Variable rate basis	three-month LIBOR plus 148 basis points
Basis spread on variable rate (percent)	1.48%
Subordinated note
Subordinated notes principal amount	$ 35,250
Portion of principal amount purchased by related parties	$ 14,050
Interest rate	10.00%
Subordinated debt | 7% Subordinated notes due April 20, 2022
Subordinated borrowing, number of purchasers | purchaser			56
Aggregate principal amount			$ 30,000
Interest rate	7.00%
Purchase price as a percentage of principal amount			100.00%
Repurchase amount as a percentage of principal			100.00%

Contingent Liabilities (Details

Contingent Liabilities (Details) $ in Millions	Dec. 31, 2016USD ($)
Commitments and Contingencies Disclosure [Abstract]
Loss Contingency Accrual	$ 2.3

Share-Based Compensation - Nar

Share-Based Compensation - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	85,425	44,700
Treasury Stock Reissued Shares For Director Grants	9,950	10,150	10,200
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	$ 950,000	$ 963,000	$ 801,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	825
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	1,125
Allocated Share-based Compensation Expense	$ 2,839,000
2013 Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares authorized for delivery upon the exercise of incentive stock options	600,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease)	473,725
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	41,550	23,025	21,975
Allocated Share-based Compensation Expense	$ 1,864,000	$ 865,000	$ 458,000
Common Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock Reissued Shares For Director Grants	9,950	10,150	10,200
Allocated Share-based Compensation Expense	$ 1,864,000	$ 865,000	$ 458,000
Expense to be paid next twelve months [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	1,193,000
Expense to be paid Year Two [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	1,072,000
Expense to be paid Year Three [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	491,000
Expense to be paid Year Four [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 83,000

Benefit Plans - Narrative (Det

Benefit Plans - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Nov. 17, 2009
Defined Benefit Plan Disclosure [Line Items]
Company contributions		$ 0	$ 0
Expected long-term rate of return on plan assets		7.00%	7.25%
Accumulated benefit obligation for the pension plan		$ 97,200,000	$ 86,100,000
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		$ 13,900,000	$ 10,500,000
Fair value of common shares held by pension plan, per share		$ 119.66	$ 90.48
Estimated net actuarial (loss) expected to be recognized in the next fiscal year		$ (773,000)	$ (637,000)	$ 0
Expected long-term return on plan assets		7.25%	7.25%	7.25%
Cash balance in bank		$ 2,500,000
Market value of pension plan assets		167,000,000	$ 153,500,000
Equity investments		3,500,000	0
Defined Contribution Plan, Cost Recognized		1,300,000	1,200,000	$ 1,100,000
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Estimated prior service costs expected to be recognized in net periodic benefit cost during next fiscal year		0
Supplemental Executive Retirement Plan (SERP)
Defined Benefit Plan Disclosure [Line Items]
Benefit expense		1,500,000	1,100,000	$ 1,500,000
Accrued benefit cost		8,800,000	8,000,000
Level 1
Defined Benefit Plan Disclosure [Line Items]
Equity investments		149,200,000	135,000,000
Level 2
Defined Benefit Plan Disclosure [Line Items]
Equity investments		17,800,000	18,500,000
Level 3
Defined Benefit Plan Disclosure [Line Items]
Equity investments		$ 0	$ 0
Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated net actuarial (loss) expected to be recognized in the next fiscal year	$ 576,000

Benefit Plans - Plan Assets an

Benefit Plans - Plan Assets and Benefit Obligation Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Change in fair value of plan assets
Fair value at beginning of measurement period	$ 153,498	$ 160,598
Actual return on plan assets	19,256	(58)
Benefits paid	(5,707)	(7,042)
Fair value at end of measurement period	167,047	153,498	$ 160,598
Change in benefit obligation
Projected benefit obligation at beginning of measurement period	102,245	109,328
Service cost	5,055	5,368	4,331
Interest cost	4,869	4,695	4,577
Actuarial loss (gains)	7,993	(10,104)
Benefits paid	(5,707)	(7,042)
Projected benefit obligation at the end of measurement period	114,455	102,245	$ 109,328
Funded status at end of year (fair value of plan assets less benefit obligation)	$ 52,592	$ 51,253

Benefit Plans - Asset Allocati

Benefit Plans - Asset Allocation for the Pension Plan by Asset Category (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Contributions by Employer	$ 0	$ 0
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual Plan Asset Allocations	100.00%	100.00%
Defined Benefit Plan, Expected Return on Plan Assets, Percentage	7.00%	7.25%
Equity securities
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual Plan Asset Allocations	84.00%	85.00%
Fixed income and cash equivalents
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual Plan Asset Allocations	16.00%	15.00%

Benefit Plans - Weighted Avera

Benefit Plans - Weighted Average Assumptions Used to Determine Benefit Obligations (Details)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.58%	4.88%	4.42%
Rate of compensation increase
Ages 50 and over [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	3000.00%	3000.00%	3000.00%
Ages 40-49 [Domain]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	4.00%	3.00%	3.00%
Ages 30-39 [Member] [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	6.00%	6.00%	6.00%
Under age 30 [Member]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Rate of compensation increase	10.00%	10.00%	10.00%

Benefit Plans - Estimated Futu

Benefit Plans - Estimated Future Pension Benefit Payments (Details) $ in Thousands	Dec. 31, 2016USD ($)
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]
2,017	$ 6,924
2,018	7,644
2,019	7,875
2,020	8,393
2,021	9,503
2022-2026	48,058
Total	$ 88,397

Benefit Plans - Balances of Ac

Benefit Plans - Balances of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Prior service cost	$ 0	$ 0
Net actuarial loss	(22,677)	(23,618)
Total	(22,677)	(23,618)
Deferred taxes	(7,937)	(8,267)
Accumulated other comprehensive loss	$ (14,740)	$ (15,351)

Benefit Plans - Components of

Benefit Plans - Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Components of net periodic benefit cost
Service cost	$ (5,055,000)	$ (5,368,000)	$ (4,331,000)
Interest cost	(4,869,000)	(4,695,000)	(4,577,000)
Expected return on plan assets	10,950,000	11,420,000	10,869,000
Net periodic benefit income	(253,000)	(705,000)	(1,942,000)
Other amounts recognized in other comprehensive (Loss)
Change to net actuarial gain (loss) for the period	168,000	(1,400,000)	(14,276,000)
Amortization of prior service cost	0	(15,000)	(19,000)
Defined Benefit Plan, Future Amortization of Gain (Loss)	(773,000)	(637,000)	0
Amortization of net loss	773,000	637,000	0
Total recognized in other comprehensive income (loss)	941,000	(748,000)	(14,257,000)
Total recognized in net benefit cost and other comprehensive income (loss)	$ 1,194,000	$ (43,000)	$ (12,315,000)

Benefit Plans - Weighted Av104

Benefit Plans - Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase
Expected long-term return on plan assets	7.25%	7.25%	7.25%
Discount Rate	4.88%	4.42%	5.30%
Ages 30-39 [Member] [Member]
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase	6.00%	6.00%	6.00%
Under age 30 [Member]
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase	10.00%	10.00%	10.00%
Ages 40 and over [Member]
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase	3.00%	3.00%	3.00%

Income Taxes - Components of D

Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Allowance for loan losses	$ 17,719	$ 19,773
Accumulated other comprehensive loss – Pension Plan	7,937	8,266
Accumulated other comprehensive loss – Unrealized losses on securities	1,618	157
Deferred compensation	4,140	3,908
OREO valuation adjustments	2,322	2,418
Net deferred loan fees	1,397	1,204
Deferred contract bonus	1,074	1,031
Nonvested PBRSUs	1,115	463
Fixed assets	781	413
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Legal Settlements	793	482
Other	2,525	2,813
Total deferred tax assets	41,421	40,928
Deferred tax liabilities:
Deferred investment income	10,199	10,199
Pension plan	26,344	26,205
Mortgage servicing rights	3,243	3,153
Partnership adjustments	549	560
Other	596	872
Total deferred tax liabilities	40,931	40,989
Deferred Tax Assets, Net	$ 490
Net deferred tax asset (liability)		$ 61

Income Taxes - Components of t

Income Taxes - Components of the Provision for Federal and State Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Currently payable
Federal	$ 28,879	$ 26,153	$ 27,062
Other Tax Expense (Benefit)	7,300	6,664	6,869
Deferred
Federal	581	(250)	2,528
Total	$ 36,760	$ 32,567	$ 36,459

Income Taxes - Reconciliation

Income Taxes - Reconciliation of Federal Income Tax Expense (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Tax Examination, Penalties and Interest Expense	$ 1,500		$ 0
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	(1.30%)	(0.50%)	(0.50%)
Bank owned life insurance	(1.20%)	(1.80%)	(1.40%)
Effective Income Tax Rate Reconciliation, Investment in Qualified Affordable Housing, Percent	(1.70%)	(1.90%)	(1.60%)
Investments in qualified affordable housing projects, net of tax benefits	(0.00%)	(0.90%)	(0.00%)
Effective Income Tax Rate Reconciliation, Deduction, Employee Stock Ownership Plan Dividend, Percent	(1.00%)	(1.00%)	(1.00%)
Other	0.10%	(0.20%)	(0.20%)
Effective tax rate	29.90%	28.70%	30.30%

Income Taxes - Reconciliati108

Income Taxes - Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 482,000	$ 432,000	$ 413,000
Income Tax Examination, Penalties and Interest Expense	1,500		0
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
January 1 Balance	558,000	532,000	518,000
Additions based on tax positions related to the current year	117,000	80,000	76,000
Additions for tax positions of prior years	38,000	16,000	14,000
Reductions for tax positions of prior years	0	0	0
Reductions due to statute of limitations	(80,000)	(70,000)	(76,000)
December 31 Balance	633,000	558,000	532,000
Income Tax Examination, Penalties and Interest Accrued	$ 70,500	$ 69,000	$ 67,000

Other Comprehensive Income (109

Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service Cost (Credit), before Tax	$ 0	$ 15	$ 19
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss), before Tax	773	637	0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	773	652	19
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax	271	228	7
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	14,740	15,351	14,865	$ 5,598
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(3,005)	(292)	1,257	(29,821)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(17,745)	(15,643)	(13,608)	$ (35,419)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	611	(486)	(9,267)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(2,713)	(1,549)	31,078
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax	109	(910)	(9,279)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax	(2,713)	(1,549)	30,325
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(2,604)	(2,459)	21,046
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax	502	424	12
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	502	424	765
Other Comprehensive Income (Loss), Net of Tax	(2,102)	(2,035)	21,811
Gain (Loss) on Sale of Investments	0	0	1,158
Other than Temporary Impairment Losses, Investments	0	0	0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax	0	0	1,158
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	0	0	405
Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 0	$ 0	$ 753

Earnings Per Common Share - Su

Earnings Per Common Share - Summary of Computation of Basic and Diluted Earnings Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Net income available to common shareholders	$ 86,135	$ 81,012	$ 83,957
Denominator:
Weighted-average common shares outstanding	15,332,553	15,364,281	15,394,971
Effect of dilutive performance-based restricted stock units	72,607	40,459	18,861
Earnings per common share:	15,405,160	15,404,740	15,413,832
Earnings per common share:
Basic earnings per common share	$ 5.62	$ 5.27	$ 5.45
Diluted earnings per common share	$ 5.59	$ 5.26	$ 5.45

Earnings Per Common Share - Na

Earnings Per Common Share - Narrative (Details) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Class of Warrant or Right [Line Items]
Weighted Average Number Diluted Shares Outstanding Adjustment	72,607	40,459	18,861
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	41,550	23,025	21,975
Common Shares
Class of Warrant or Right [Line Items]
Treasury Stock, Shares, Acquired	0	71,700	29,700

Dividend Restrictions (Details)

Dividend Restrictions (Details) $ in Millions	Dec. 31, 2016USD ($)
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Amount available for dividend distribution without prior approval from regulatory authority	$ 71.7

Financial Instruments With O113

Financial Instruments With Off-Balance Sheet Risk And Financial Instruments With Concentrations Of Credit Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Risks and Uncertainties [Abstract]
Loan commitments	$ 912,007	$ 888,411
Standby letters of credit	$ 13,746	$ 12,326

Loan Servicing - Narrative (De

Loan Servicing - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Servicing Assets at Fair Value [Line Items]
Mortgage Servicing Rights Fair Value	$ 9,299	$ 9,593
Transfers and Servicing of Financial Assets [Abstract]
Serviced sold mortgage loans	1,330,000	1,276,000	$ 1,265,000
Serviced sold mortgage loans with recourse	4,100	5,400	7,000
Mortgage loans sold with recourse, reserve	$ 266	$ 500
Mortgage servicing rights, discount rate	13.00%	10.00%
Servicing fees included in other service income	$ 3,400	$ 3,400	$ 3,500
Minimum
Transfers and Servicing of Financial Assets [Abstract]
Mortgage servicing rights, constant prepayment speeds	6.20%	6.30%
Maximum
Transfers and Servicing of Financial Assets [Abstract]
Mortgage servicing rights, constant prepayment speeds	16.80%	22.00%

Loan Servicing - Activity for

Loan Servicing - Activity for MSRs And Related Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Mortgage servicing rights:
Carrying amount, net, beginning of year	$ 9,008	$ 8,613	$ 9,013
Additions	2,286	1,748	1,026
Amortization	(1,835)	(1,637)	(1,631)
Change in valuation allowance	(193)	284	205
Carrying amount, net, end of year	9,266	9,008	8,613
Valuation allowance:
Beginning of year	542	826	1,031
Change in valuation allowance	193	(284)	(205)
End of year	$ 735	$ 542	$ 826

Fair Values - Narrative (Detai

Fair Values - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
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	$ 24,943	$ 28,705
Allowance for loans individually evaluated for impairment	548	4,191
Book Value Of Impaired Loans Carried At Fair Value	6,379	11,783
Impaired loans carried at fair value	5,983	9,496
Impaired Financing Receivable, Related Allowance	548	4,191
Impaired Financing Receivable, carried at fair value, related expense	900	(2,100)	$ (3,000)
MSR recorded at lower of cost or fair value	9,266	9,008	8,613	$ 9,013
Servicing Asset at Fair Value, Amount	6,800	1,900
Valuation allowance of MSR	735	542	826	$ 1,031
MSRs recorded at cost	2,500	7,100
Valuation allowance for impairment of recognized servicing assets, provisions (recoveries)	(193)	284	205
Other Real Estate, Foreclosed Assets, and Repossessed Assets	$ 13,926	$ 18,651
Percent of OREO held at fair value	50.00%	46.00%
Estimated fair value of other real estate owned (OREO)	$ 6,900	$ 8,500
OREO devaluations	601	1,592	$ 2,406
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	$ 396	$ 2,287

Fair Values - Assets and Liabi

Fair Values - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage Loans Held for Sale	$ 10,413	$ 7,306
Mortgage IRLCs	124	165
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	10,413	7,306
Mortgage IRLCs	124	165
Level 3
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage IRLCs	0	0
Fair value swap
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swaps, fair value	226	226
Fair value swap | Level 3
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swaps, fair value	226	226
Recurring basis
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage Loans Held for Sale	10,413	7,306
Mortgage IRLCs	124	165
Recurring basis | Level 2
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage Loans Held for Sale	10,413	7,306
Mortgage IRLCs	124	165
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	267,533	522,063
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	267,533	522,063
Recurring basis | U.S. Government Sponsored Entities’ Asset-Backed Securities
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment Securities	987,172	911,493
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	987,172	911,493
Recurring basis | Equity securities
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment Securities	3,434	2,710
Recurring basis | Equity securities | Level 1
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment Securities	2,644	1,941
Recurring basis | Equity securities | Level 3
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment Securities	790	769
Recurring basis | Fair value swap
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swaps, fair value	226	226
Recurring basis | Fair value swap | Level 3
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swaps, fair value	$ 226	$ 226

Fair Values - Reconciliation o

Fair Values - Reconciliation of the Level 3 Inputs for Financial Instruments Measured on a Recurring Basis (Details) - Recurring basis - Level 3 - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Equity Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 769	$ 776
Total Gains (Losses)
Included in earnings - realized	0	0
Included in earnings - unrealized	0	0
Included in other comprehensive income	21	(7)
Purchases, sales, issuances and settlements, other, net	0	0
Re-evaluation of fair value swap		0
Ending balance	790	769
Fair Value Swap
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(226)	(226)
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		0
Ending Balance	$ (226)	$ (226)

Fair Values - Assets and Li119

Fair Values - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	$ 5,983	$ 9,496
Mortgage Servicing Rights	6,800	1,900
Other loans	5,161,919	4,997,318
Level 3
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	5,983	9,496
Other loans	5,161,919	4,997,318
Nonrecurring basis
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	5,983	9,496
Mortgage Servicing Rights	6,769	1,867
Other loans	6,897	8,515
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	6,769	1,867
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	5,983	9,496
Other loans	6,897	8,515
Nonrecurring basis | Commercial real estate
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	3,057	3,698
Other loans	2,644	2,796
Nonrecurring basis | Commercial real estate | Level 1
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans	0	0
Nonrecurring basis | Commercial real estate | Level 2
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans	0	0
Nonrecurring basis | Commercial real estate | Level 3
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	3,057	3,698
Other loans	2,644	2,796
Nonrecurring basis | Construction real estate
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans	3,322	3,387
Nonrecurring basis | Construction real estate | Level 1
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans	0	0
Nonrecurring basis | Construction real estate | Level 2
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans	0	0
Nonrecurring basis | Construction real estate | Level 3
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans	3,322	3,387
Nonrecurring basis | SEPH commercial land and development
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value		2,044
Nonrecurring basis | SEPH commercial land and development | Level 3
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value		2,044
Nonrecurring basis | Remaining commercial
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	541	1,872
Nonrecurring basis | Remaining commercial | Level 3
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	541	1,872
Nonrecurring basis | Residential real estate
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	2,385	1,882
Other loans	931	2,332
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	2,385	1,882
Other loans	$ 931	$ 2,332

Fair Values - Qualitative Info

Fair Values - Qualitative Information About Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on a Non-recurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	$ 5,983	$ 9,496
Other real estate owned	5,161,919	4,997,318
Nonrecurring basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	5,983	9,496
Other real estate owned	6,897	8,515
Commercial real estate | Nonrecurring basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	3,057	3,698
Other real estate owned	2,644	2,796
Commercial real estate | Nonrecurring basis | Loans receivable
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	3,057	3,698
Construction real estate | Nonrecurring basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other real estate owned	3,322	3,387
SEPH commercial land and development | Nonrecurring basis | Loans receivable
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans		2,044
Remaining commercial | Nonrecurring basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	541	1,872
Remaining commercial | Nonrecurring basis | Loans receivable
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	541	1,872
Residential real estate | Nonrecurring basis
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	2,385	1,882
Other real estate owned	931	2,332
Residential real estate | Nonrecurring basis | Loans receivable
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired loans	2,385	1,882
Commercial real estate | Nonrecurring basis | Other real estate owned
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other real estate owned	2,644	2,796
Construction real estate | Nonrecurring basis | Other real estate owned
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other real estate owned	3,322	3,387
Residential Real Estate | Nonrecurring basis | Other real estate owned
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other real estate owned	$ 931	$ 2,332
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	90.00%	45.90%
Sales comparison approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	20.20%	20.30%
Sales comparison approach | SEPH commercial land and development | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables		5.00%
Sales comparison approach | SEPH commercial land and development | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables		40.00%
Sales comparison approach | SEPH commercial land and development | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables		22.10%
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	11.10%	25.30%
Sales comparison approach | Remaining commercial | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	1.60%	1.00%
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	110.00%	96.70%
Sales comparison approach | Residential real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Adj to comparables	17.00%	12.50%
Sales comparison approach | Commercial real estate | Low | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	0.00%	2.00%
Sales comparison approach | Commercial real estate | High | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	68.40%	71.00%
Sales comparison approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	26.50%	26.90%
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	90.00%	85.00%
Sales comparison approach | Construction real estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	24.70%	24.30%
Sales comparison approach | Residential Real Estate | Low | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	3.20%	0.00%
Sales comparison approach | Residential Real Estate | High | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	79.70%	61.80%
Sales comparison approach | Residential Real Estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Adj to comparables	30.60%	23.00%
Income approach | Commercial real estate | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Capitalization rate	9.00%	7.00%
Income approach | Commercial real estate | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Capitalization rate	10.60%	13.30%
Income approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Capitalization rate	10.10%	9.50%
Income approach | Residential real estate | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Capitalization rate	10.00%	3.80%
Income approach | Residential real estate | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Capitalization rate	10.00%	10.10%
Income approach | Residential real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Capitalization rate	10.00%	9.10%
Income approach | Commercial real estate | Low | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Capitalization rate	13.00%	9.50%
Income approach | Commercial real estate | High | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Capitalization rate	14.00%	9.50%
Income approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Capitalization rate	13.10%	9.50%
Cost approach | Commercial real estate | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Fair Value Inputs, Accumulated Depreciation	17.00%	50.00%
Cost approach | Commercial real estate | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Fair Value Inputs, Accumulated Depreciation	18.00%	50.00%
Cost approach | Commercial real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Fair Value Inputs, Accumulated Depreciation	17.80%	50.00%
Cost approach | Residential real estate | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Fair Value Inputs, Accumulated Depreciation		33.30%
Cost approach | Residential real estate | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Fair Value Inputs, Accumulated Depreciation		50.00%
Cost approach | Residential real estate | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Fair Value Inputs, Accumulated Depreciation		43.40%
Bulk sale approach | SEPH commercial land and development | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Discount rate		10.70%
Bulk sale approach | SEPH commercial land and development | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Discount rate		10.70%
Bulk sale approach | SEPH commercial land and development | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Discount rate		10.70%
Bulk sale approach | Remaining commercial | Low | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Discount rate	10.00%	10.00%
Bulk sale approach | Remaining commercial | High | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Discount rate	10.00%	10.70%
Bulk sale approach | Remaining commercial | Weighted Average [Member] | Nonrecurring basis | Loans receivable
Fair Value Inputs [Abstract]
Discount rate	10.00%	10.00%
Bulk sale approach | Construction real estate | Low | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Discount rate	15.00%	15.00%
Bulk sale approach | Construction real estate | High | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Discount rate	15.00%	15.00%
Bulk sale approach | Construction real estate | Weighted Average [Member] | Nonrecurring basis | Other real estate owned
Fair Value Inputs [Abstract]
Discount rate	15.00%	15.00%

Fair Values - Fair Value of Fi

Fair Values - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Financial assets:
Cash and money market instruments	$ 146,466	$ 149,459
Investment securities	1,514,811	1,587,694
Mortgage loans held for sale	10,413	7,306
Impaired loans carried at fair value	5,983	9,496
Derivative Asset	124	165
Other loans	5,161,919	4,997,318
Loans receivable, net	5,178,439	5,014,285
Financial liabilities:
Non-interest bearing checking accounts	1,523,417	1,404,032
Interest bearing transaction accounts	1,174,448	1,107,200
Savings accounts	1,704,920	1,544,708
Time Deposits, Fair Value	1,122,598	1,295,329
Other	1,301	1,290
Total deposits	5,526,684	5,352,559
Short-term borrowings	394,795	394,242
Long-term debt	712,958	771,420
Subordinated debentures/notes	40,903	41,596
Fair value swap
Derivative financial instruments:
Swaps, fair value	226	226
Level 1
Financial assets:
Cash and money market instruments	146,466	149,459
Investment securities	2,644	1,941
Derivative Asset	0	0
Loans receivable, net	0	0
Financial liabilities:
Non-interest bearing checking accounts	1,523,417	1,404,032
Interest bearing transaction accounts	1,174,448	1,107,200
Savings accounts	1,704,920	1,544,708
Other	1,301	1,290
Total deposits	4,404,086	4,057,230
Level 2
Financial assets:
Investment securities	1,511,377	1,584,984
Mortgage loans held for sale	10,413	7,306
Derivative Asset	124	165
Loans receivable, net	10,537	7,471
Financial liabilities:
Time Deposits, Fair Value	1,122,598	1,295,329
Total deposits	1,122,598	1,295,329
Short-term borrowings	394,795	394,242
Long-term debt	712,958	771,420
Subordinated debentures/notes	40,903	41,596
Level 3
Financial assets:
Investment securities	790	769
Impaired loans carried at fair value	5,983	9,496
Derivative Asset	0	0
Other loans	5,161,919	4,997,318
Loans receivable, net	5,167,902	5,006,814
Financial liabilities:
Total deposits	0	0
Level 3 | Fair value swap
Derivative financial instruments:
Swaps, fair value	226	226
Available-for-sale Securities [Member]
Financial assets:
Accrued interest receivable	3,849	4,436
Available-for-sale Securities [Member] | Level 2
Financial assets:
Accrued interest receivable	3,849	4,436
Loans
Financial assets:
Accrued interest receivable	14,973	14,239
Loans | Level 3
Financial assets:
Accrued interest receivable	14,973	14,239
Deposits
Financial liabilities:
Accrued interest payable	900	987
Deposits | Level 1
Financial liabilities:
Accrued interest payable	82	66
Deposits | Level 2
Financial liabilities:
Accrued interest payable	818	921
Borrowings
Financial liabilities:
Accrued interest payable	1,251	1,351
Borrowings | Level 1
Financial liabilities:
Accrued interest payable	1	4
Borrowings | Level 2
Financial liabilities:
Accrued interest payable	1,250	1,347
Reported Value Measurement [Member]
Financial assets:
Cash and money market instruments	146,466	149,459
Investment securities	1,517,972	1,585,568
Mortgage loans held for sale	10,413	7,306
Impaired loans carried at fair value	5,983	9,496
Derivative Asset	124	165
Other loans	5,204,713	4,994,624
Loans receivable, net	5,221,233	5,011,591
Financial liabilities:
Non-interest bearing checking accounts	1,523,417	1,404,032
Interest bearing transaction accounts	1,174,448	1,107,200
Savings accounts	1,704,920	1,544,708
Time Deposits, Fair Value	1,117,870	1,290,412
Other	1,301	1,290
Total deposits	5,521,956	5,347,642
Short-term borrowings	394,795	394,242
Long-term debt	694,281	738,105
Subordinated debentures/notes	45,000	45,000
Reported Value Measurement [Member] | Fair value swap
Derivative financial instruments:
Swaps, fair value	226	226
Reported Value Measurement [Member] | Available-for-sale Securities [Member]
Financial assets:
Accrued interest receivable	3,849	4,436
Reported Value Measurement [Member] | Loans
Financial assets:
Accrued interest receivable	14,973	14,239
Reported Value Measurement [Member] | Deposits
Financial liabilities:
Accrued interest payable	900	987
Reported Value Measurement [Member] | Borrowings
Financial liabilities:
Accrued interest payable	$ 1,251	$ 1,351

Fair Values Schedule of Impaire

Fair Values Schedule of Impaired Financing Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Book Value Of Impaired Loans Carried At Fair Value	$ 6,379	$ 11,783
Partial Charge-Offs On Impaired Loans carried at Fair Value	3,681	10,512
Impaired Financing Receivable, Related Allowance	548	4,191
Impaired loans carried at fair value	5,983	9,496
Impaired Financing Receivable, loans not held at Fair Value, Recorded Investment	64,047	68,881
Partial Charge-offs on Impaired Loans carried at Cost	21,262	18,193
impaired Financing Receivable, loans not held at Fair Value, Carrying Amount	63,895	66,977
Recorded investment	70,426	80,664	$ 73,712
Partial charge-offs on impaired loans	24,943	28,705
Individually evaluated for impairment	548	4,191
Impaired Financing Receivable, Carrying Value	69,878	76,473
Financing Receivable, not collateral dependent [Domain]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	152	1,904
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	$ 396	$ 2,287

Capital Ratios - Capital Ratio

Capital Ratios - Capital Ratios for Park and Each Subsidiary (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital Conservation Buffer	0.625%
Park National Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Risk-Based Capital	9.87%	9.83%
Tier One Risk Based Capital Required for Capital Adequacy	$ 324,115	$ 310,560
Common Equity Tier 1	9.87%	9.83%
Common Equity Tier 1 Capital Required For Capital Adequacy	$ 243,086	$ 232,920
Total Risk-Based	11.24%	11.37%
Capital Required for Capital Adequacy	$ 432,153	$ 414,079
Leverage Capital Required For Capital Adequacy To Average Total Assets	4.00%	4.00%
Common Equity Tier 1 Capital	$ 533,215	$ 508,763
Leverage Capital Required To Be Well Capitalized	$ 363,339	$ 360,183
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	6.00%	6.00%
Leverage Capital	$ 533,215	$ 508,763
Tier One Risk Based Capital Required to be Well Capitalized	$ 432,153	$ 414,079
Common Equity Tier 1 Capital Required For Capital Adequacy To Average Total Assets	4.50%	4.50%
Common Equity Tier 1 Capital Required To Be Well Capitalized	$ 351,125	$ 336,439
Leverage	7.34%	7.06%
Leverage Capital Required For Capital Adequacy	$ 290,671	$ 288,147
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%	8.00%
Capital Required to be Well Capitalized	$ 540,192	$ 517,599
Tier One Risk Based Capital	$ 533,215	$ 508,763
Common Equity Tier 1 Capital Required To Be Well Capitalized To Average Total Assets	6.50%	6.50%
Risk Based Capital	$ 607,269	$ 588,467
Leverage Capital Required To Be Well Capitalized To Average Total Assets	5.00%	5.00%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%	8.00%
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%	10.00%
Park
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Risk-Based Capital	12.83%	12.82%
Tier One Risk Based Capital Required for Capital Adequacy	$ 328,673	$ 314,310
Common Equity Tier 1	12.55%	12.54%
Common Equity Tier 1 Capital Required For Capital Adequacy	$ 246,505	$ 235,732
Total Risk-Based	14.32%	14.49%
Capital Required for Capital Adequacy	$ 438,231	$ 419,080
Leverage Capital Required For Capital Adequacy To Average Total Assets	4.00%	4.00%
Common Equity Tier 1 Capital	$ 687,651	$ 656,664
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	6.00%	6.00%
Leverage Capital	$ 702,651	$ 671,664
Common Equity Tier 1 Capital Required For Capital Adequacy To Average Total Assets	4.50%	4.50%
Leverage	9.56%	9.22%
Leverage Capital Required For Capital Adequacy	$ 293,916	$ 291,449
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%	8.00%
Leverage Capital Required For Capital Adequacy plus capital conservation buffer To Average Total Assets	4.00%	4.00%
Tier One Risk Based Capital Required For Capital Adequacy plus capital conservation buffer To Average Total Assets	8.50%	8.50%
Common Equity Tier 1 Capital Required For Capital Adequacy plus capital conservation buffer To Average Total Assets	7.00%	7.00%
Capital Required For Capital Adequacy plus capital conservation buffer To Average Total Assets	10.50%	10.50%
Tier One Risk Based Capital	$ 702,651	$ 671,664
Risk Based Capital	$ 784,406	$ 758,988

Segment Information - Schedule

Segment Information - Schedule of Operating Results by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Other Noninterest Expense	$ 190,627	$ 179,267	$ 180,267
Net interest income (loss)	238,086	227,632	225,044
Depreciation, Amortization and Accretion, Net	8,396	7,347	7,243
(Recovery of) provision for loan losses	(5,101)	4,990	(7,333)
Other income	78,731	77,551	75,549
Gain (Loss) on Sale of Investments	0	0	(1,158)
Other expense	199,023	186,614	187,510
Income (loss) before taxes	122,895	113,579	120,416
Income taxes (benefit)	36,760	32,567	36,459
Net income	86,135	81,012	83,957
Assets	7,467,586	7,311,354	7,001,199
Loans	5,271,857	5,068,085	4,829,682
Total deposits	5,521,956	5,347,642	5,128,000
Totals For Reportable Segments [Member]
Segment Reporting Information [Line Items]
Other Noninterest Expense	180,896	169,295	172,267
Net interest income (loss)	238,224	227,393	227,056
Depreciation, Amortization and Accretion, Net	8,396	7,347	7,243
Income taxes (benefit)	41,117	37,238	41,246
Assets	7,447,148	7,299,098	6,994,456
Total deposits	5,634,008	5,451,920	5,228,649
PNB
Segment Reporting Information [Line Items]
Net interest income (loss)	227,576	220,879	218,641
(Recovery of) provision for loan losses	2,611	7,665	3,517
Other income	74,803	75,188	69,384
Other expense	177,562	167,476	163,641
Income (loss) before taxes	122,206	120,926	120,867
Income taxes (benefit)	37,755	36,581	37,960
Net income	84,451	84,345	82,907
Assets	7,389,538	7,229,764	6,910,386
Loans	5,234,828	5,029,072	4,781,761
Total deposits	5,630,199	5,447,293	5,222,766
GFSC
Segment Reporting Information [Line Items]
Net interest income (loss)	5,874	6,588	7,457
(Recovery of) provision for loan losses	1,887	1,415	1,544
Other income	(1)	2	(1)
Other expense	4,457	2,984	4,103
Income (loss) before taxes	(471)	2,191	1,809
Income taxes (benefit)	(164)	768	634
Net income	(307)	1,423	1,175
Assets	32,268	35,793	40,308
Loans	32,661	35,469	40,645
Total deposits	3,809	4,627	5,883
SEPH
Segment Reporting Information [Line Items]
Net interest income (loss)	4,774	(74)	958
(Recovery of) provision for loan losses	(9,599)	(4,090)	(12,394)
Other income	2,974	1,848	5,991
Other expense	7,273	6,182	11,766
Income (loss) before taxes	10,074	(318)	7,577
Income taxes (benefit)	3,526	(111)	2,652
Net income	6,548	(207)	4,925
Assets	25,342	33,541	43,762
Loans	12,354	15,153	23,956
Total deposits	0	0	0
All Other
Segment Reporting Information [Line Items]
Net interest income (loss)	(138)	239	(2,012)
(Recovery of) provision for loan losses	0	0	0
Other income	955	513	175
Other expense	9,731	9,972	8,000
Income (loss) before taxes	(8,914)	(9,220)	(9,837)
Income taxes (benefit)	(4,357)	(4,671)	(4,787)
Net income	(4,557)	(4,549)	(5,050)
Assets	20,438	12,256	6,743
Loans	(7,986)	(11,609)	(16,680)
Total deposits	(112,052)	(104,278)	(100,649)
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Other Noninterest Expense	0	0	0
Net interest income (loss)	2,164	2,561	3,708
Depreciation, Amortization and Accretion, Net	0	0	0
Income taxes (benefit)	0	0	0
Assets	(9,204)	(13,557)	(18,556)
Total deposits	(112,052)	(104,278)	(100,649)
Parent Co Gfsc Totals Not Eliminated [Member]
Segment Reporting Information [Line Items]
Other Noninterest Expense	9,731	9,972	8,000
Net interest income (loss)	(2,302)	(2,322)	(5,720)
Depreciation, Amortization and Accretion, Net	0	0	0
Income taxes (benefit)	(4,357)	(4,671)	(4,787)
Assets	29,642	25,813	25,299
Total deposits	$ 0	$ 0	$ 0

Parent Company Statements - Na

Parent Company Statements - Narrative (Details) - Parent Company - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income taxes	$ 4,400	$ 4,130	$ 5,810
Undistributed earnings, restricted from transfer as dividends	$ 259,700	$ 199,400

Parent Company Statements - Ba

Parent Company Statements - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets:
Other assets	$ 520,124	$ 506,425
Total assets	7,467,586	7,311,354	$ 7,001,199
Liabilities:
Subordinated notes	45,000	45,000
Other liabilities	69,314	73,010
Total liabilities	6,725,346	6,597,999
Total liabilities and shareholders’ equity	7,467,586	7,311,354
Parent Company
Assets:
Cash	112,067	102,416	$ 98,671	$ 106,942
Investment in subsidiaries	626,569	613,383
Debentures receivable from PNB	25,000	25,000
Other investments	2,962	2,341
Other assets	26,651	23,443
Total assets	793,249	766,583
Liabilities:
Subordinated notes	45,000	45,000
Other liabilities	6,009	8,228
Total liabilities	51,009	53,228
Total shareholders’ equity	742,240	713,355
Total liabilities and shareholders’ equity	$ 793,249	$ 766,583

Parent Company Statements - St

Parent Company Statements - Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income:
Interest and dividends	$ 276,258	$ 265,074	$ 265,143
Expense:
Federal income tax benefit	(36,760)	(32,567)	(36,459)
Net income	86,135	81,012	83,957
Other Comprehensive Income (Loss), Net of Tax	(2,102)	(2,035)	21,811
Parent Company
Income:
Dividends from subsidiaries	60,000	60,000	60,000
Interest and dividends	2,164	2,561	3,708
Other	1,081	560	262
Total income	63,245	63,121	63,970
Expense:
Other, net	12,159	12,341	13,807
Total expense	12,159	12,341	13,807
Income before federal taxes and equity in undistributed income of subsidiaries	51,086	50,780	50,163
Federal income tax benefit	4,357	4,671	4,787
Income before equity in undistributed income of subsidiaries	55,443	55,451	54,950
Equity in undistributed income of subsidiaries	30,692	25,561	29,007
Net income	86,135	81,012	83,957
Other Comprehensive Income (Loss), Net of Tax	(2,102)	(2,035)	21,811
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 84,033	$ 78,977	$ 105,768

Parent Company Statements -128

Parent Company Statements - Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net income	$ 86,135	$ 81,012	$ 83,957
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based Compensation	2,814	1,828	1,259
(Decrease) increase in other liabilities	2,006	1,173	5,689
Net cash provided by operating activities	87,887	89,234	71,743
Investing activities:
Net cash used in investing activities	(152,560)	(395,468)	(229,580)
Financing activities
Repayment of subordinated notes	0	0	(35,250)
Net cash provided by financing activities	61,660	217,994	248,506
Increase (decrease) in cash and cash equivalents	(3,013)	(88,240)	90,669
Parent Company
Net income	86,135	81,012	83,957
Adjustments to reconcile net income to net cash provided by operating activities:
Undistributed income of subsidiaries	(30,692)	(25,561)	(29,007)
Increase in other assets	(3,425)	(182)	(1,292)
(Decrease) increase in other liabilities	(2,524)	485	298
Net cash provided by operating activities	52,308	57,582	55,215
Investing activities:
Repayment of investments in and advances to subsidiaries	15,000	10,000	32,000
Net cash used in investing activities	15,000	10,000	32,000
Financing activities
Cash dividends paid	(57,653)	(57,776)	(57,876)
Cash payment for fractional shares	(4)	(3)	(5)
Net cash provided by financing activities	(57,657)	(63,837)	(95,486)
Increase (decrease) in cash and cash equivalents	9,651	3,745	(8,271)
Cash at beginning of year	102,416	98,671	106,942
Cash at end of year	112,067	102,416	98,671
Parent Company
Adjustments to reconcile net income to net cash provided by operating activities:
Compensation expense for issuance of treasury shares to directors	950	963	801
Share-based Compensation	1,864	865	458
Treasury Stock, Common [Member]
Financing activities
Payments for Repurchase of Equity	$ 0	$ 6,058	$ 2,355