Park National (PRK) 10-K 26 Feb 19 2018 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 25, 2019	Jun. 30, 2018
Entity Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
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 Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		15,611,521
Entity Public Float			$ 1,668,369,370

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets:
Cash and due from banks	$ 141,890	$ 131,946
Money market instruments	25,324	37,166
Cash and cash equivalents	167,214	169,112
Investment securities:
Debt securities available-for-sale, at fair value (amortized cost of $1,028,883 and $1,097,645 at December 31, 2018 and 2017, respectively)	1,003,421	1,091,881
Debt securities held-to-maturity, at amortized cost (fair value of $351,422 and $363,779 at December 31, 2018 and 2017, respectively)	351,808	357,197
Other investment securities	55,851	63,746
Total investment securities	1,411,080	1,512,824
Total loans	5,692,132	5,372,483
Allowance for loan losses	(51,512)	(49,988)
Net loans	5,640,620	5,322,495
Other assets:
Bank owned life insurance	188,417	189,322
Prepaid assets	94,079	97,712
Goodwill	112,739	72,334
Intangible Assets, Net (Excluding Goodwill)	6,971	0
Premises and equipment, net	59,771	55,901
Affordable housing tax credit investments	50,347	49,669
Accrued interest receivable	22,974	22,164
Other real estate owned	4,303	14,190
Mortgage loan servicing rights	10,178	9,688
Other	35,615	22,209
Total other assets	585,394	533,189
Total assets	7,804,308	7,537,620
Deposits:
Non-interest bearing	1,804,881	1,633,941
Interest bearing	4,455,979	4,183,385
Total deposits	6,260,860	5,817,326
Short-term borrowings	221,966	391,289
Long-term debt	400,000	500,000
Subordinated notes	15,000	15,000
Total borrowings	636,966	906,289
Other liabilities:
Accrued interest payable	2,625	2,278
Unfunded commitments in affordable housing tax credit investments	22,282	14,282
Other	49,069	41,344
Total other liabilities	73,976	57,904
Total liabilities	6,971,802	6,781,519
Commitments and contingencies
Shareholders’ equity:
Preferred Stock, Value, Issued	0	0
Common shares, no par value (20,000,000 common shares authorized; 16,586,165 and 16,150,752 common shares issued at December 31, 2018 and 2017, respectively)	358,598	307,726
Accumulated other comprehensive loss, net of taxes	(49,788)	(26,454)
Retained earnings	614,069	561,908
Less: Treasury shares (887,987 and 862,558 common shares at December 31, 2018 and 2017, respectively)	(90,373)	(87,079)
Total shareholders’ equity	832,506	756,101
Total liabilities and shareholders’ equity	$ 7,804,308	$ 7,537,620

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Amortized cost of securities available-for-sale	$ 1,028,883	$ 1,097,645
Fair value of securities held-to-maturity	$ 351,422	$ 363,779
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	16,586,165	16,150,752
Treasury stock, shares	887,987	862,558

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest and dividend income:
Interest and fees on loans	$ 271,145	$ 248,687	$ 241,979
Interest and dividends on:
Obligations of U.S. Government, its agencies and other securities - taxable	29,479	27,440	30,627
Obligations of states and political subdivisions - tax-exempt	8,770	7,210	2,632
Other interest income	1,407	3,087	1,020
Total interest and dividend income	310,801	286,424	276,258
Interest on deposits:
Demand and savings deposits	19,815	9,464	4,079
Time deposits	12,375	9,629	9,337
Interest on short-term borrowings	1,600	992	456
Interest on long-term debt	10,113	22,580	24,300
Total interest expense	43,903	42,665	38,172
Net interest income	266,898	243,759	238,086
Provision for (recovery of) loan losses	7,945	8,557	(5,101)
Net interest income after provision for (recovery of) loan losses	258,953	235,202	243,187
Net (loss) gain on the sale of investment securities	(2,271)	1,821	0
Gain on equity securities, net	3,213	0	0
Other components of net periodic benefit income	6,820	5,794	5,308
Bank owned life insurance income	6,815	4,858	4,338
ATM fees	1,978	2,253	2,268
Gain on the sale of OREO, net	4,235	251	1,323
OREO valuation adjustments	(491)	(458)	(601)
Gain on the sale of non-performing loans	2,826	0	0
Miscellaneous	8,639	6,562	6,268
Total other income	101,101	86,429	84,039
Other expense:
Salaries	103,755	92,177	87,034
Employee benefits	30,289	24,937	24,174
Data processing fees	8,477	7,250	5,608
Professional fees and services	28,894	24,833	27,181
Occupancy expense	11,251	10,201	10,239
Furniture and equipment expense	16,139	15,324	13,766
Insurance	5,289	6,354	5,825
Marketing	5,144	4,374	4,523
Communication	4,981	4,826	4,985
State tax expense	3,813	3,583	3,560
Amortization of intangibles	578	0	0
Prepayment penalty on long-term debt	0	0	5,554
Miscellaneous	10,145	9,303	11,882
Total other expense	228,755	203,162	204,331
Income (loss) before taxes	131,299	118,469	122,895
Income Tax Expense (Benefit)	20,912	34,227	36,760
Net income	$ 110,387	$ 84,242	$ 86,135
Earnings per common share:
Basic (in dollars per share)	$ 7.13	$ 5.51	$ 5.62
Diluted (in dollars per share)	$ 7.07	$ 5.47	$ 5.59
Fiduciary and Trust [Member]
Interest on deposits:
Revenue from Contract with Customer, Including Assessed Tax	$ 26,293	$ 23,735	$ 21,400
Deposit Account [Member]
Interest on deposits:
Revenue from Contract with Customer, Including Assessed Tax	11,461	12,653	14,259
Bank Servicing [Member]
Interest on deposits:
Revenue from Contract with Customer, Including Assessed Tax	14,266	13,162	14,419
Miscellaneous	14,300	13,200	14,400
Debit Card [Member]
Interest on deposits:
Revenue from Contract with Customer, Including Assessed Tax	$ 17,317	$ 15,798	$ 15,057

Statements of Comprehensive Inc

Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income	$ 110,387	$ 84,242	$ 86,135
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	(1,075)	(455)	(502)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	4,046	9,241	(109)
Other comprehensive (loss) income, net of income tax:
Changes in pension plan assets and benefit obligations recognized in other comprehensive income	(2,971)	(8,786)	611
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	2,024	(1,184)	0
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax	(17,586)	1,261	(2,713)
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax	(15,562)	77	(2,713)
Other Comprehensive Income (Loss), Net of Tax	(18,533)	(8,709)	(2,102)
Comprehensive income	$ 91,854	$ 75,533	$ 84,033

Statements of Comprehensive I_2

Statements of Comprehensive Income (Parenthetical) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	$ 1,075,000	$ 455,000	$ 502,000
Tax Effect
Amortization of net loss and prior service costs, tax expense	286	121	271
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax	(1,076)	(2,457)	59
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	538	(637)	0
Unrealized net holding (loss) gain on securities available-for-sale, tax expense	(4,674)	678	(1,461)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	$ (4,046,000)	$ (9,241,000)	$ 109,000

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Shares	Common Shares	Retained Earnings	AOCI Including Portion Attributable to Noncontrolling Interest [Member]	Treasury Shares	Accumulated Other Comprehensive (Loss) Income	Retained Earnings
Beginning balance at Dec. 31, 2015		$ 0	$ 303,966	$ 507,505		$ (82,473)	$ (15,643)
Beginning 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 (loss) income, 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		$ 0	$ 305,826	535,631		(81,472)	(17,745)
Ending balance, shares at Dec. 31, 2016		0	15,340,718
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 84,242			84,242
Other comprehensive (loss) income, net of income tax:
Other Comprehensive Income (Loss), Net of Tax	$ (8,709)						(8,709)
Cash dividends				(57,883)
Fractional shares issued in dividend reinvestment plan, shares			(55)
Cash payment for fractional shares in dividend reinvestment plan			$ (6)
Allocated Share-based Compensation Expense			$ 2,701
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures			6,381
Stock Granted, Value, Share-based Compensation, Net of Forfeitures			$ (795)	(197)		(645)
Treasury Stock, Shares, Acquired			(70,000)
Treasury Stock, Value, Acquired, Cost Method						7,378
Treasury Stock Reissued Shares For Director Grants	11,150		11,150
Treasury shares reissued for director grants				115		1,126
Ending balance at Dec. 31, 2017	$ 756,101	$ 0	$ 307,726	561,908		(87,079)	(26,454)
Ending balance (Adjustments for New Accounting Pronouncement [Member]) at Dec. 31, 2017				563,825			(27,449)
Ending balance, shares at Dec. 31, 2017		0	15,288,194
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets							(3,806)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | Accounting Standards Update 2016-01 [Member]				1,917	$ (995)		(995)
Cumulative Effect of New Accounting Principle in Period of Adoption | Adjustments for New Accounting Pronouncement [Member]								$ 3,806
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	110,387			110,387
Other comprehensive (loss) income, net of income tax:
Other Comprehensive Income (Loss), Net of Tax	(18,533)						(18,533)
Cash dividends				(63,555)
Fractional shares issued in dividend reinvestment plan, shares			(44)
Cash payment for fractional shares in dividend reinvestment plan			$ (4)
Stock Issued During Period, Shares, Acquisitions			435,457
Stock Issued During Period, Value, Acquisitions			$ 48,519
Allocated Share-based Compensation Expense	$ 3,954		3,954
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures	12,921
Stock Granted, Value, Share-based Compensation, Net of Forfeitures			$ (1,597)	(317)		(1,304)
Treasury Stock, Shares, Acquired			(50,000)
Treasury Stock, Value, Acquired, Cost Method						5,784
Treasury Stock Reissued Shares For Director Grants	11,650		11,650
Treasury shares reissued for director grants				(77)		1,186
Ending balance at Dec. 31, 2018	$ 832,506	$ 0	$ 358,598	$ 614,069		$ (90,373)	$ (49,788)
Ending balance, shares at Dec. 31, 2018		0	15,698,178

Consolidated Statements of Ch_2

Consolidated Statements of Changes In Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Common Stock, Dividends, Per Share, Cash Paid	$ 4.07	$ 3.76	$ 3.76

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest Paid, Including Capitalized Interest, Operating and Investing Activities	$ 43,600	$ 42,538	$ 38,359
Operating activities:
Net income	110,387	84,242	86,135
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for (recovery of) loan losses	7,945	8,557	(5,101)
Amortization of loan fees and costs, net	(6,158)	(5,758)	(5,279)
Net accretion of purchase accounting adjustments	(793)	0	0
Depreciation of premises and equipment	8,585	8,644	8,396
Amortization of investment securities, net	1,262	1,473	247
Amortization of prepayment penalty on long-term debt	0	5,719	6,176
Prepayment penalty on long-term debt	0	0	5,554
Decrease in deferred income tax	538	3,289	581
Realized net investment securities losses (gains)	2,271	(1,821)	0
Gain on equity securities, net	(3,213)	0	0
Loan originations to be sold in secondary market	(202,827)	(230,860)	(287,722)
Proceeds from sale of loans in secondary market	207,836	242,139	290,132
Gain on sale of nonperforming loans	(2,826)	0	0
Share-based compensation expense	5,063	3,942	2,814
OREO valuation adjustments	491	458	601
Gain on sale of OREO, net	(4,235)	(251)	(1,323)
Bank owned life insurance income	(6,815)	(4,858)	(4,338)
Investment in qualified affordable housing tax credits amortization	7,322	10,278	7,300
Pension contribution	0		0
Changes in assets and liabilities:
Decrease (increase) in other assets	9,163	(1,060)	(7,042)
Increase (decrease) in other liabilities	5,131	(11,778)	2,006
Net cash provided by operating activities	132,950	87,991	87,887
Investing activities:
Proceeds from redemption/repurchase of Federal Home Loan Bank stock	7,003	0	0
Proceeds from sales of investment securities	244,399	2,265	0
Proceeds from calls and maturities of:
Held-to-maturity debt securities	10,547	14,426	29,901
Available-for-sale debt securities	197,826	193,937	753,325
Purchase of:
Held-to-maturity debt securities	(7,133)	(113,519)	(141,045)
Available-for-sale debt securities	(373,372)	(29,684)	(579,006)
Equity securities	(2,590)	0	(3,500)
Net loan originations, portfolio loans	57,315	119,336	199,494
Proceeds from sale of nonperforming loans	3,000	0	0
Proceeds from the sale of OREO	13,094	2,921	8,704
Life insurance death benefits	8,096	1,037	1,050
Investment in qualified affordable housing projects	0	(7,000)	(15,029)
Purchases of premises and equipment	(11,533)	(7,018)	(7,466)
Cash received from acquisitions, net	12,270	0	0
Net cash provided by (used in) investing activities	44,292	(61,971)	(152,560)
Financing activities
Net increase in deposits	159,590	295,370	174,314
Net (decrease) increase in short-term borrowings	(169,323)	(3,506)	553
Proceeds from issuance of long-term debt	50,000	150,000	0
Repayment of subordinated notes	0	(30,000)	0
Repayment of long-term debt	(150,000)	(350,000)	(55,554)
Value of common shares withheld to pay employee income taxes	(610)	(347)	0
Cash dividends paid	(63,013)	(57,493)	(57,653)
Net cash (used in) provided by financing activities	(179,140)	(3,354)	61,660
(Decrease) increase in cash and cash equivalents	(1,898)	22,666	(3,013)
Cash and cash equivalents at beginning of year	169,112	146,446	149,459
Cash and cash equivalents at end of year	167,214	169,112	146,446
Income Taxes Paid	7,345	26,190	27,260
Non cash activities [Abstract]
Real Estate Owned, Transfer to Real Estate Owned	1,204	3,457	3,339
Affordable Housing Program Obligation, Period Increase (Decrease)	8,000	7,000	9,000
Consumer
Adjustments to reconcile net income to net cash provided by operating activities:
Increase in prepaid dealer premiums	(1,298)	(4,350)	(5,733)
Mortgages [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of loans in secondary market	4,879	5,014	5,517
Foreclosed Asset [Domain]
Changes in assets and liabilities:
Decrease (increase) in other assets	(11,379)	(5,553)	0
Treasury Stock, Common [Member]
Financing activities
Repurchase of treasury shares	$ (5,784)	(7,378)	$ 0
Pension Plan [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Pension contribution		$ (15,000)

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
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”), unless the context otherwise requires. Material intercompany accounts and transactions have been eliminated. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America ("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. Additionally, prior period financial statements reflect the retrospective application of Accounting Standards Update ("ASU") 2017-07 - Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. These reclassifications had no impact on net income or shareholders' equity. Restrictions on Cash and Due from Banks The Corporation’s national bank subsidiary, The Park National Bank ("PNB"), is required to maintain average reserve balances with the Federal Reserve Bank of Cleveland. The average required reserve balance was approximately $73.9 million at December 31, 2018 and $64.8 million at December 31, 2017 . No other compensating balance arrangements were in existence at December 31, 2018 . Investment Securities Debt securities are classified upon acquisition into one of three categories: held-to-maturity ("HTM"), available-for-sale ("AFS"), or trading (see Note 5 - Investment Securities). HTM securities are those debt securities that the Corporation has the positive intent and ability to hold to maturity and are recorded at amortized cost. AFS securities are those debt 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. Equity securities are carried at fair value, with changes in fair value reported in net income. Equity securities without readily determinable fair values are carried at cost, minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment. Debt 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 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. The credit loss is defined as the difference between the present value of the cash flows expected to be collected and the amortized costs basis. 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 method. Federal Home Loan Bank ("FHLB") and Federal Reserve Bank of Cleveland ("FRB") Stock PNB is a member of the FHLB and 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 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 value of the interest rate lock is recorded at the time the commitment to fund the mortgage loan is executed and is adjusted for the expected exercise of the commitment before the loan is funded. In order to hedge the change in interest rates resulting from its commitments to fund the loans, the Company enters into forward commitments for the future delivery of mortgage loans when interest rate locks are entered into. Fair value of these mortgage derivatives is estimated based on the change in mortgage interest rates from the date the interest on the loan is locked. Changes in the fair values of these derivatives are included in "Other service income" in the Consolidated Statements of Income. 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 nonaccrual interest payments applied to principal, 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. Late charges on loans are recognized as income when they are collected. Net 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. The delinquency status of a loan is based on contractual terms and not on how recently payments have been received. Commercial loans placed on nonaccrual status are considered impaired (see Note 6 - Loans). Park’s charge-off policy for commercial loans requires management to establish a specific reserve or record a charge-off when collection is in doubt or it is probable a loss has been incurred 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. 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. 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 ("C&I") loans are made for a wide variety of general corporate purposes, including financing for commercial and industrial properties, financing for equipment, inventory and accounts receivable, acquisition financing, commercial leasing, and to consumer finance companies. 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. Risk of loss on C&I loans largely depends upon general economic cycles, as they may adversely impact certain industries, competency of the borrower's management team, the quality of the underlying assets supporting the loans including accounts receivable, inventory, and equipment, and the accuracy of the borrower's financial reporting. Such risks are mitigated by generally requiring the borrower's owners to guaranty the loans. 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. Risk of loss on CRE loans largely depends upon the cash flow of the properties which is influenced by the amount of vacancy experienced by the underlying real estate, the credit capacity of the tenants occupying the underlying real estate, and general economic trends as they may adversely impact the value of the property. These risks are mitigated by generally requiring personal guaranties of the owners of the properties and by requiring appraisals pursuant to government regulations. 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 a 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 a current independent third-party appraisal providing the market value of the real estate securing the loan. Residential real estate loans typically have longer terms and higher balances with lower yields as compared to consumer loans, but generally carry lower risks of default. The Dodd-Frank Wall Street Reform and Consumer Protection Act requires creditors to make a reasonable and good faith determination of a consumer's ability to repay any consumer credit transaction secured by a dwelling. Documentation and verification of income within defined time frames and not-to-exceed limits are basis for affirming ability to repay. Risk of loss largely depends upon factors affecting the borrower's ability to repay as well as the general economic trends as they may adversely impact the value of the property. These risks are mitigated by completing a comprehensive underwriting of the borrower and by requiring appraisals pursuant to government regulations. 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. Concentration of Credit Risk Park's commercial loan portfolio includes loans to a wide variety of corporations and businesses across many industrial classifications in the 29 Ohio counties, 2 North Carolina counties and 1 Kentucky county where PNB and its divisions operate, with the exception of nationwide aircraft loans and nationwide asset-based lending to consumer finance companies. The primary industries represented by these customers include real estate rental and leasing, finance and insurance, construction, agriculture, forestry, fishing and hunting, manufacturing, retail trade, health care, accommodation and food services and other services. Purchased Credit Impaired (“PCI”) Loans The Company has purchased loans, some of which have shown evidence of credit deterioration since origination. These PCI loans are recorded at fair value, such that there is no carryover of the sellers' allowance for loan losses. After acquisition, losses are recognized by an increase in the allowance for loan losses. Such PCI loans are accounted for individually. The Company estimates the amount and timing of expected cash flows for each loan and the expected cash flows in excess of the amount paid is recorded as interest income over the remaining life of the loan (accretable yield). The excess of the loan’s contractual principal and interest over expected cash flows is not recorded (nonaccretable difference). Over the life of the loan, expected cash flows continue to be estimated. If the present value of expected cash flows is less than the carrying amount, a loss is recorded as a provision for loan losses. If the present value of expected cash flows is greater than the carrying amount, it is recognized as part of future interest income. 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, 2018 , 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 2018 within the individual segments of the commercial and consumer loan categories. The 108 -month historical loss period captures all annual periods subsequent to June 2009, the end of the most recent recession, thus encompassing the full economic cycle to date. The loss factor applied to Park’s consumer loan portfolio as of December 31, 2018 was based on the historical loss experience over the preceding 108 months, plus an additional judgmental reserve, increasing the total allowance for loan loss coverage in the consumer loan portfolio to approximately 1.87 years of historical losses, compared to 1.92 years at December 31, 2017 . Historical loss experience over the preceding 108 months for the consumer loan portfolio was 0.33% for 2018. Historical loss experience over the preceding 96 months for the consumer loan portfolio was 0.34% for 2017. The loss factor applied to Park’s commercial loan portfolio as of December 31, 2018 was based on the historical loss experience over the preceding 108 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 3.39 years of historical losses at December 31, 2018, compared to 3.24 years at December 31, 2017 . Historical loss experience over the preceding 108 months for the commercial loan portfolio was 0.35% for 2018. Historical loss experience over the preceding 96 months for the commercial loan portfolio was 0.37% for 2017. 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 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. Loans acquired as part of the acquisition of NewDominion Bank were recorded at fair value on the date of acquisition, July 1, 2018. An allowance is only established on these NewDominion Bank loans as a result of credit deterioration post acquisition. As of December 31, 2018, there was no allowance related to acquired NewDominion Bank loans. Troubled Debt Restructurings 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 measured at the present value of estimated future cash flows using the loan’s effective rate at inception, or if a TDR is considered to be a collateral dependent loan, the loan is reported, net, at the fair value of the collateral. Commercial TDRs are separately identified for impairment disclosures. 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 16 Years Other Real Estate Owned ("OREO") Management transfers a loan to OREO at the time that Park takes deed/title to 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". Foreclosed Assets Foreclosed assets include non-real estate assets where Park, as creditor, has received physical possession of a borrower’s assets, regardless of whether formal foreclosure proceedings take place. Additionally, TDRs in which Park obtains one of more of the debtor’s non-real estate assets in place of all or part of the receivable are accounted for as foreclosed assets. Foreclosed assets are initially recorded as fair value less costs to sell when acquired, establishing a new cost basis. Operating costs after acquisition are expensed. As of December 31, 2018 and 2017, Park had $4.0 million and $5.5 million , respectively, of foreclosed assets included within “Other assets.” Mortgage Servicing Rights ("MSRs") When Park sells mortgage loans with MSRs retained, MSRs are recorded at fair value with the income statement effect recorded in "Other service income." Capitalized MSRs 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”. MSRs are assessed for impairment periodically, based on fair value, with any impairment recognized through a valuation allowance. The fair value of MSRs 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 25 - 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 amortization of MSRs is netted against loan servicing fee income, recorded in "Other service income". Goodwill and Other Intangible Assets Goodwill represents the excess of the purchase price over net identifiable tangible and intangible assets acquired in a purchase business combination. Goodwill is not amortized to expense, but is 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 the performance of additional analysis 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, not to exceed the total goodwill allocated to the reporting unit. 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, 2018, the goodwill remaining on Park's Consolidated Balance Sheets consisted entirely of goodwill at PNB. (See Note 8 - Goodwill and Other Intangible Assets and Note 28 - 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, 2018, the Company determined that goodwill for PNB was not impaired. There have been no subsequent circumstances or events triggering an additional evaluation. Other intangible assets consist of core deposit intangibles and a trade name intangible. Core deposit intangibles are amortized on an accelerated basis over a period of ten years. The trade name intangible is an indefinite life assets and is not amortized but rather is assessed, at least annually, for impairment. Goodwill of $112.7 million and other intangible assets in the amount of $7.0 million were recorded at December 31, 2018 and $72.3 million of goodwill was recorded at each of December 31, 2017 and 2016. Goodwill and other intangible assets increased by an aggregate amount of $48.0 million as a result of the acquisition of NewDominion on July 1, 2018. Consolidated Statements 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. Management does not believe there now are such matters that will have a material effect on the financial statements. 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

Adoption of New Accounting Pron

Adoption of New Accounting Pronouncements and Issued Not Yet Effective Accounting Standards	12 Months Ended
	Dec. 31, 2018
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 But Not Yet Effective Accounting Standards The following is a summary of new accounting pronouncements impacting Park's consolidated financial statements, and issued but not yet effective accounting standards: Adoption of New Accounting Pronouncements ASU 2014-09 - Revenue from Contracts with Customers (Topic 606): In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). This 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. The majority of the Company's revenues come from interest income and other sources, including loans, leases, securities and derivatives, that are outside the scope of ASC 606. Certain services that fall within the scope of ASC 606 are presented within "Other income" and are recognized as revenue as the Company satisfies its obligation to the customer. Services within the scope of ASC 606 include income from fiduciary activities, service charges on deposit accounts, other service income, checkcard fee income, ATM fees, and gain on sale of OREO, net. The adoption of this guidance on January 1, 2018 did not have a material impact on Park's consolidated financial statements. However, the adoption of this standard resulted in additional disclosures beginning with the Quarterly Report on 2018 Form 10-Q for the quarterly period ended March 31, 2018. Reference Note 30 - Revenue from Contracts with Customers, for further discussion on the Company's accounting policies for revenue sources within the scope of ASC 606. 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 reflected in the current 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, this ASU clarifies guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on AFS 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 on January 1, 2018 resulted in a $1.9 million increase to beginning retained earnings and a $995,000 increase to beginning accumulated other comprehensive loss. Further, beginning with the first quarter of 2018, Park's fair value disclosures (see Note 26 - Fair Value), have incorporated the revised disclosure requirements for financial investments. 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 then current GAAP was either unclear or did 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. The adoption of this guidance on January 1, 2018 did not have an impact on Park's consolidated financial statements. As such transactions arise, management will utilize the updated guidance in providing disclosures within Park’s consolidated statements of cash flows. ASU 2017-07 - Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost: In March 2017, the FASB issued ASU 2017-07 - Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. This ASU requires that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the income statement separately from the service cost component. The new guidance is effective for annual reporting periods, and interim reporting periods within those annual periods, beginning after December 15, 2017. As a result of the adoption of this guidance on January 1, 2018, all prior periods have been recast to separately record the service cost component and other components of net benefit cost. For all periods presented, this resulted in an increase in other income and an offsetting increase in other expense with no change to net income. See Note 19 - Benefit Plans, for further details. ASU 2017-09 - Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting: In May 2017, the FASB issued ASU 2017-09 - Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting. This ASU amends the guidance concerning which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting under Topic 718. 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 on January 1, 2018 did not impact Park's consolidated financial statements. ASU 2017-12 - Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities: In August 2017, the FASB issued ASU 2017-12 - Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. This ASU amends the current guidance with the objective of improving the financial reporting of hedging relationships to better portray the economic results of an entity's risk management activities in its financial statements. In addition, this ASU amends the current guidance to simplify the application of the hedge accounting guidance. 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 for interim or annual periods. The early adoption of this guidance on July 1, 2018 did not have an impact on Park's consolidated financial statements. Park will apply this guidance to future transactions. ASU 2018-02 - Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income : In February 2018, the FASB issued ASU 2018-02 - Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. This ASU allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects, resulting from the federal corporate income tax rate enacted under the Tax Cuts and Jobs Act. The amount of the reclassification is the difference between the historical federal corporate income tax rate and the newly-enacted 21% federal corporate income tax rate. The guidance is effective for annual reporting periods, and interim reporting periods within those annual periods, beginning after December 15, 2018. Early adoption is permitted for interim or annual periods. The early adoption of this guidance effective January 1, 2018 resulted in a $3.8 million increase to Park's accumulated other comprehensive loss and a $3.8 million increase to retained earnings. ASU 2018-03 - Technical Corrections and Improvements to Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. In February 2018, the FASB issued ASU 2018-03 - Technical Corrections and Improvements to Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. This ASU includes amendments that clarify certain aspects of the guidance issued in ASU 2016-01. Park considered this clarification in determining the appropriate adoption of ASU 2016-01 effective as of January 1, 2018. Issued But Not Yet Effective Accounting Standards ASU 2016-02 - Leases (Topic 842): In February 2016, the FASB issued ASU 2016-02 - Leases (Topic 842) . This 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. The adoption of this guidance on January 1, 2019 resulted in an approximate $11.1 million increase in assets and an approximate $11.0 million increase in liabilities, but is not expected to have a material impact on Park's Consolidated Statements of Income. 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 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 the CECL model and is currently in the process of evaluating segmentation and model selection. Management plans to run our current allowance model and a CECL model concurrently beginning with March 31, 2019 data. ASU 2017-08 - Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities: In March 2017, the FASB issued ASU 2017-08 - Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities. This ASU amends the amortization period for certain purchased callable debt securities held at a premium. It shortens the amortization period for the premium to the earliest call date. Under current GAAP, premiums on callable debt securities generally are amortized to the maturity date. The new guidance is effective for annual reporting periods, and interim reporting periods within those annual periods, beginning after December 15, 2018. The adoption of this guidance on January 1, 2019 did not have a material impact on Park's consolidated financial statements. ASU 2018-10 - Codification Improvements to Topic 842, Leases: In July 2018, the FASB issued ASU 2018-10 - Codification Improvements to Topic 842, Leases . This ASU includes amendments that clarify certain aspects of the guidance issued in ASU 2016-02. Park considered this clarification in determining the appropriate adoption of ASU 2016-02 on January 1, 2019. ASU 2018-11 - Leases (Topic 842): Targeted Improvements: In July 2018, the FASB issued ASU 2018-11 - Leases (Topic 842): Targeted Improvements . This ASU amends the guidance in ASU 2016-02 which is not yet effective. The amendments in the ASU provide entities with an additional (and optional) transition method to adopt the new leases standard. Under this new transition method, an entity initially applies the new leases standard at the adoption date and recognizes a cumulative-effect adjustment to the opening balance of retained earnings for the period of adoption. Additionally, this amendment provides lessors with a practical expedient, by class of asset, to not separate nonlease components from the associated lease component and, instead, to account for those components as a single component if certain criteria are met. Park considered this clarification in determining the appropriate adoption of ASU 2016-02 on January 1, 2019. ASU 2018-13 - Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement: In August 2018, the FASB issued ASU 2018-13 - Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement . This ASU modifies the disclosure requirements on fair value measurements in Topic 820, Fair Value Measurement by removing, modifying and adding certain requirements. The amendments in this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted upon issuance of this ASU. An entity is permitted to early adopt and remove or modify disclosures upon issuance of the ASU and delay adoption of the additional disclosures until their effective date. The adoption of this guidance will not have an impact on Park’s consolidated financial statements, but will impact disclosures. ASU 2018-14 - Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans: In August 2018, the FASB issued ASU 2018-14 - Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans . These amendments in this ASU modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans by removing disclosures that are no longer considered cost beneficial, clarifying the specific requirements of disclosures and adding disclosure requirements identified as relevant. The amendments in this ASU are effective for fiscal years ending after December 15, 2020. Early adoption is permitted. The adoption of this guidance will not have an impact on Park’s consolidated financial statements, but will impact disclosures. ASU 2018-16 - Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes: In October 2018, the FASB issued ASU 2018-16 - Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes. The amendments in this ASU permit use of the OIS rate based on SOFR as a U.S. benchmark interest rate for hedge accounting purposes under Topic 815 in addition to the interest rates on direct Treasury obligations of the U.S. government ("UST"), the LIBOR swap rate, the OIS rate based on the Fed Funds Effective Rate, and the SIFMA Municipal Swap Rate. The amendments in this ASU are effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The adoption of this guidance on January 1, 2019 did not have an impact on Park’s consolidated financial statements. ASU 2018-19 - Codification Improvements to Topic 326, Financial Instruments - Credit Losses: In November 2018, the FASB issued ASU 2018-19 - Codification Improvements to Topic 326, Financial Instruments - Credit Losses. The amendment in this ASU clarifies that receivables arising from operating leases are not within the scope of Subtopic 326-20. Impairment of receivables arising from operating leases should be accounted for in accordance with Topic 842, Leases. Park will consider this clarification in determining the appropriate adoption of ASU 2016-13, effective for annual reporting periods and interim reporting periods within those annual periods, beginning after December 15, 2019. ASU 2018-20 - Leases (Topic 842): Narrow - Scope Improvements for Lessors: In December 2018, the FASB issued ASU 2018-20 - Leases (Topic 842): Narrow - Scope Improvements for Lessors. The amendments in this ASU address the treatment of certain sales taxes and other similar taxes, certain lessor costs and recognition of variable payments for contracts with lease and nonlease components. Park considered this clarification in determining the appropriate adoption of ASU 2016-02 on January 1, 2019.

Organization

Organization	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization Park National Corporation is a financial holding company headquartered in Newark, Ohio. Through PNB, Park is engaged in a general commercial banking and trust business, primarily in Ohio and North Carolina, with the exception of nationwide aircraft loans and nationwide asset-based lending to consumer finance companies. 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 Richland Bank Division headquartered in Mansfield, Ohio, the Century National Bank Division headquartered in Zanesville, Ohio, the First-Knox National Bank Division headquartered in Mount Vernon, Ohio, the United Bank, N.A. Division headquartered in Bucyrus, Ohio, the Second National Bank Division headquartered in Greenville, Ohio, the Security National Bank Division headquartered in Springfield, Ohio, the Unity National Bank Division headquartered in Piqua, Ohio, The Park National Bank of Southwest Ohio & Northern Kentucky Division headquartered in Cincinnati, Ohio, and the NewDominion Bank Division headquartered in Charlotte, North Carolina. 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 nonperforming loans and OREO. This segment represents a run off portfolio of the legacy Vision assets. All of PNB's 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 28 - Segment Information for financial information on the Corporation’s operating segments.

Business Combination

Business Combination	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Business Combination	Business Combinations On July 1, 2018, NewDominion Bank, a North Carolina state-chartered bank (“NewDominion”), merged with and into PNB, with PNB continuing as the surviving entity pursuant to the Agreement and Plan of Merger and Reorganization (the “NewDominion Merger Agreement”), dated as of January 22, 2018, by and among Park, PNB, and NewDominion. In accordance with the NewDominion Merger Agreement, NewDominion shareholders were permitted to make an election to receive for their shares of NewDominion common stock either $1.08 in cash without interest (the cash consideration) or 0.01023 of a Park common share, plus cash in lieu of any fractional Park common share (the stock consideration). Based on the terms of the NewDominion Merger Agreement, the aggregate consideration to be paid in the merger was subject to proration and allocation procedures to ensure that 60 percent of the shares of NewDominion common stock outstanding immediately prior to the completion of the merger were exchanged for the stock consideration and that the remaining 40 percent of the shares of NewDominion common stock outstanding immediately prior to the completion of the merger were exchanged for the cash consideration, including, in each case, shares of NewDominion common stock subject to NewDominion options and restricted stock awards. Purchase consideration consisted of 435,457 Park common shares, valued at $48.5 million , and $30.7 million in cash to acquire 91.45% of the outstanding shares of NewDominion common stock. The remaining 8.55% of the outstanding shares of NewDominion common stock were previously held by Park. Park recognized a gain of $3.5 million as a result of the remeasuring to fair value of its 8.55% equity interest in NewDominion held before the business combination. This non-taxable gain is included in "Gain on equity securities, net" in the consolidated statements of income. The acquisition is expected to provide additional revenue growth and geographic diversification. NewDominion's results of operations were included in Park’s results beginning July 1, 2018. For the year ended December 31, 2018, Park recorded merger-related expenses of $4.6 million associated with the NewDominion acquisition. Of this $4.6 million in expense, $2.5 million is included within "Professional fees and services", $2.0 million is included within "Salaries", and $78,000 is included within "Employee benefits" on the consolidated statements of income. Goodwill of $40.4 million arising from the acquisition consisted largely of synergies and the cost savings resulting from the combining of the operations of PNB and NewDominion. The goodwill is not deductible for income tax purposes as the transaction was accounted for as a tax-free exchange. The following table summarizes the consideration paid for NewDominion and the amounts of the assets acquired and liabilities assumed at their fair value: (in thousands) Consideration Cash $ 30,684 Park common shares 48,519 Previous 8.55% investment in NewDominion 7,000 Fair value of total consideration transferred $ 86,203 Recognized amounts of identifiable assets acquired and liabilities assumed Cash and cash equivalents $ 42,954 Securities 1,954 Loans 272,753 Premises and equipment 940 Core deposit intangibles 6,249 Trade name intangible 1,300 Other assets 6,133 Total assets acquired $ 332,283 Deposits 284,231 Other liabilities 2,254 Total liabilities assumed 286,485 Net identifiable assets 45,798 Goodwill $ 40,405 Park accounted for the NewDominion acquisition using the acquisition method of accounting and accordingly, assets acquired, liabilities assumed and consideration exchanged were recorded at estimated fair value on the acquisition date, in accordance with FASB ASC Topic 805, Business Combinations. The fair value of net assets acquired includes fair value adjustments to loans that were not considered impaired as of the acquisition date. The fair value adjustments were determined using discounted contractual cash flows. However, Park believes that all contractual cash flows related to these loans will be collected. As such, these loans were not considered impaired at the acquisition date and were not subject to the guidance relating to purchased credit impaired loans, which have shown evidence of credit deterioration since origination. Loans acquired that were not subject to these requirements included non-impaired loans with a fair value and gross contractual amounts receivable of $267.9 million and $273.7 million , respectively, on the date of acquisition. The table below presents information with respect to the fair value of the NewDominion acquired loans as well as their book balance at the acquisition date. (in thousands) Book Balance Fair Value Commercial, financial and agricultural $ 19,246 $ 19,138 Commercial real estate 119,434 117,638 Construction real estate: Commercial 22,494 22,235 Mortgage 8,391 8,111 Residential real estate: Commercial 14,798 14,797 Mortgage 50,295 48,714 HELOC 37,651 36,688 Consumer 541 539 Purchased credit impaired 5,069 4,893 Total loans $ 277,919 $ 272,753 The following table presents supplemental pro forma information as if the acquisition had occurred at the beginning of 2017. The unaudited pro forma information includes adjustments for interest income on loans and securities acquired, amortization of intangibles arising from the transaction, depreciation expense on property acquired, interest expense on deposits acquired, and the related tax effects. The pro forma information is not necessarily indicative of the results of operations that would have occurred had the transactions been effected on the assumed dates. Twelve months ended December 31, (dollars in thousands, except per share data) 2018 2017 Net interest income $ 273,685 $ 257,604 Net income 115,118 89,092 Basic earnings per share 7.33 5.66 Diluted earnings per share 7.27 5.62

Investment Securities

Investment Securities	12 Months Ended
	Dec. 31, 2018
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 2018 , 2017 and 2016, there were no investment securities deemed to be other-than-temporarily impaired. Investment securities at December 31, 2018 and December 31, 2017 were as follows: (In thousands) Amortized Cost Gross Unrealized/Unrecognized Holding Gains Gross Unrealized/Unrecognized Holding Losses Estimated Fair Value 2018: Debt Securities Available-for-Sale U.S. Government sponsored entities’ asset-backed securities $ 1,028,883 $ 453 $ 25,915 $ 1,003,421 Total $ 1,028,883 $ 453 $ 25,915 $ 1,003,421 2018: Debt Securities Held-to-Maturity Obligations of states and political subdivisions $ 305,278 $ 3,202 $ 2,672 $ 305,808 U.S. Government sponsored entities’ asset-backed securities 46,530 87 1,003 45,614 Total $ 351,808 $ 3,289 $ 3,675 $ 351,422 (In thousands) Amortized Cost Gross Unrealized/Unrecognized Holding Gains Gross Unrealized/Unrecognized Holding Losses Estimated Fair Value 2017: Debt Securities Available-for-Sale Obligations of U.S. Treasury and other U.S. Government sponsored entities $ 245,000 $ — $ 2,280 $ 242,720 U.S. Government sponsored entities’ asset-backed securities 852,645 4,645 8,129 849,161 Total $ 1,097,645 $ 4,645 $ 10,409 $ 1,091,881 2017: Debt Securities Held-to-Maturity Obligations of states and political subdivisions $ 300,412 $ 6,575 $ 713 $ 306,274 U.S. Government sponsored entities’ asset-backed securities 56,785 758 38 57,505 Total $ 357,197 $ 7,333 $ 751 $ 363,779 Park’s U.S. Government sponsored entities' asset-backed securities consisted primarily of 15 -year residential mortgage-backed securities and collateralized mortgage obligations ("CMOs"). At December 31, 2018 , the amortized cost of Park’s AFS mortgage-backed securities was $705.3 million and there were no HTM mortgage-backed securities within Park's investment portfolio. At December 31, 2018 , the amortized cost of Park's AFS and HTM CMOs was $323.6 million and $46.5 million , respectively. The following table provides detail on investment securities with unrealized/unrecognized losses aggregated by investment category and length of time the individual securities had been in a continuous loss position at December 31, 2018 and December 31, 2017 : Less than 12 Months 12 Months or Longer Total (In thousands) Fair Value Unrealized/Unrecognized Losses Fair Value Unrealized/Unrecognized Losses Fair Value Unrealized/Unrecognized Losses 2018: Debt Securities Available-for-Sale U.S. Government sponsored entities' asset-backed securities $ 506,280 $ 5,998 $ 449,569 $ 19,917 $ 955,849 $ 25,915 Total $ 506,280 $ 5,998 $ 449,569 $ 19,917 $ 955,849 $ 25,915 2018: Debt Securities Held-to-Maturity Obligations of states and political subdivisions $ 91,960 $ 1,095 $ 70,723 $ 1,577 $ 162,683 $ 2,672 U.S. Government sponsored entities’ asset-backed securities 32,656 838 6,931 165 39,587 1,003 Total $ 124,616 $ 1,933 $ 77,654 $ 1,742 $ 202,270 $ 3,675 Less than 12 Months 12 Months or Longer Total (In thousands) Fair Value Unrealized/Unrecognized Losses Fair Value Unrealized/Unrecognized Losses Fair Value Unrealized/Unrecognized Losses 2017: Debt Securities Available-for-Sale Obligations of U.S. Treasury and other U.S. Government sponsored entities $ 24,931 $ 70 $ 217,789 $ 2,210 $ 242,720 $ 2,280 U.S. Government sponsored entities' asset-backed securities 236,924 2,786 318,797 5,343 555,721 8,129 Total $ 261,855 $ 2,856 $ 536,586 $ 7,553 $ 798,441 $ 10,409 2017: Debt Securities Held-to-Maturity Obligations of states and political subdivisions $ 26,644 $ 194 $ 45,498 $ 519 $ 72,142 $ 713 U.S. Government sponsored entities' asset-backed securities 7,331 38 — — 7,331 38 Total $ 33,975 $ 232 $ 45,498 $ 519 $ 79,473 $ 751 Management does not believe any individual unrealized/unrecognized loss as of December 31, 2018 or 2017 represented an other-than-temporary impairment. The unrealized/unrecognized losses on agency issued and non-agency issued 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 attributable to credit will be recognized in net income in the period the other-than-temporary impairment is identified. The amortized cost and estimated fair value of investments in debt securities at December 31, 2018 , 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) Debt Securities Available-for-Sale U.S. Government sponsored entities’ asset-backed securities $ 1,028,883 $ 1,003,421 2.35 % Debt Securities Held-to-Maturity Obligations of states and political subdivisions Due five through ten years $ 4,036 $ 3,987 3.04 % Due greater than ten years 301,242 301,821 3.69 % Total $ 305,278 $ 305,808 3.68 % U.S. Government sponsored entities’ asset-backed securities $ 46,530 $ 45,614 2.83 % (1) The tax equivalent yield for obligations of states and political subdivisions includes the effects of a taxable equivalent adjustment using a 21% federal corporate income tax rate. At December 31, 2018 , investment securities with an amortized cost of $332 million were pledged for government and trust department deposits, $280 million were pledged to secure repurchase agreements and $22 million were pledged as collateral for FHLB advance borrowings. At December 31, 2017 , investment securities with an amortized cost of $317 million were pledged for government and trust department deposits, $215 million were pledged to secure repurchase agreements and $25 million were pledged as collateral for FHLB advance borrowings. At December 31, 2018 , 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 2018, Park sold certain AFS debt securities with a book value of $245.0 million at a gross loss of $2.6 million , sold certain AFS debt securities with a book value of $2.0 million at a gross gain of $60,000 , and sold certain HTM debt securities with a book value of $7.4 million at a gross gain of $0.3 million . These HTM debt securities had been paid down by 96.3% of the principal outstanding at acquisition. During 2017, Park sold certain equity securities with a book value of $444,000 at a gain of $1.8 million . No investment securities were sold during 2016. Other investment securities (as shown on the Consolidated Balance Sheets) consist of stock investments in the FHLB, the FRB and equity securities. The FHLB and FRB restricted stock investments are carried at their redemption value. Equity securities with a readily determinable fair value are carried at fair value. Beginning on January 1, 2018, with the adoption of ASU 2016-01, changes in fair value are included in other income on the Consolidated Statements of Income as opposed to in accumulated other comprehensive loss on the Consolidated Balance Sheets. Equity securities without a readily determinable fair value are recorded at cost, minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions ("modified cost"). The carrying amount of other investment securities at December 31, 2018 and 2017 was as follows: (In thousands) December 31, 2018 December 31, 2017 FHLB stock $ 43,388 $ 50,086 FRB stock 8,225 8,225 Equity investments carried at fair value 1,649 1,935 Equity investments carried at cost/modified cost (1) 2,589 3,500 Total other investment securities $ 55,851 $ 63,746 (1) There have been no impairments, downward adjustments, or upward adjustments made to equity investments carried at modified cost. For the year ended December 31, 2018, $287,000 of unrealized losses were recorded within "Gain on equity securities, net" on the consolidated statements of income. An additional $3.5 million gain recorded within "Gain on equity securities, net" on the consolidated statements of income for the year ended December 31, 2018 relates to Park's 8.55% investment in NewDominion which was held at December 31, 2017. See Note 4 - Business Combinations.

Loans

Loans	12 Months Ended
	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Abstract]
Loans	Loans The composition of the loan portfolio, by class of loan, as of December 31, 2018 and December 31, 2017 was as follows: 12/31/2018 12/31/2017 (In thousands) Loan Balance Accrued Interest Receivable Recorded Investment Loan Balance Accrued Interest Receivable Recorded Investment Commercial, financial and agricultural * $ 1,072,786 $ 4,603 $ 1,077,389 $ 1,053,453 $ 4,413 $ 1,057,866 Commercial real estate * 1,283,045 4,750 1,287,795 1,167,607 4,283 1,171,890 Construction real estate: Commercial 175,300 801 176,101 125,389 401 125,790 Mortgage 70,541 151 70,692 52,203 133 52,336 Installment 2,433 7 2,440 3,878 13 3,891 Residential real estate: Commercial 429,730 1,150 430,880 393,094 1,029 394,123 Mortgage 1,134,278 1,227 1,135,505 1,110,426 1,516 1,111,942 HELOC 215,283 1,159 216,442 203,178 974 204,152 Installment 14,327 36 14,363 18,526 53 18,579 Consumer 1,292,136 3,756 1,295,892 1,241,736 3,808 1,245,544 Leases 2,273 26 2,299 2,993 36 3,029 Total loans $ 5,692,132 $ 17,666 $ 5,709,798 $ 5,372,483 $ 16,659 $ 5,389,142 * 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 $12.5 million at December 31, 2018 and of $12.2 million at December 31, 2017 , which represented a net deferred income position in both years. At December 31, 2018 , loans included a purchase accounting adjustment of $4.4 million , which represented a net deferred income position. This fair market value adjustment is expected to be recognized into interest income on a level yield basis over the remaining expected life of the loans. Overdrawn deposit accounts of $2.3 million and $1.9 million had been reclassified to loans at December 31, 2018 and 2017 , 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 TDRs, and loans past due 90 days or more and still accruing by class of loan as of December 31, 2018 and December 31, 2017 : 12/31/2018 (In thousands) Nonaccrual Loans Accruing TDRs Loans Past Due 90 Days or More and Accruing Total Nonperforming Loans Commercial, financial and agricultural $ 14,998 $ 196 $ 10 $ 15,204 Commercial real estate 25,566 2,860 — 28,426 Construction real estate: Commercial 1,866 — — 1,866 Mortgage — 15 20 35 Installment 19 9 — 28 Residential real estate: Commercial 2,610 122 — 2,732 Mortgage 16,892 9,100 1,124 27,116 HELOC 2,158 1,028 9 3,195 Installment 468 1,049 24 1,541 Consumer 3,377 843 1,115 5,335 Total loans $ 67,954 $ 15,222 $ 2,302 $ 85,478 12/31/2017 (In thousands) Nonaccrual Loans Accruing TDRs Loans Past Due 90 Days or More and Accruing Total Nonperforming Loans Commercial, financial and agricultural $ 16,773 $ 1,291 $ — $ 18,064 Commercial real estate 12,979 5,163 — 18,142 Construction real estate: Commercial 986 338 — 1,324 Mortgage 8 92 — 100 Installment 52 — — 52 Residential real estate: Commercial 18,835 224 — 19,059 Mortgage 16,841 10,766 568 28,175 HELOC 1,593 1,025 14 2,632 Installment 586 616 7 1,209 Consumer 3,403 662 1,256 5,321 Total loans $ 72,056 $ 20,177 $ 1,845 $ 94,078 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, 2018 and December 31, 2017 . 12/31/2018 12/31/2017 (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 $ 15,194 $ 15,120 $ 74 $ 18,064 $ 18,039 $ 25 Commercial real estate 28,426 28,426 — 18,142 18,142 — Construction real estate: Commercial 1,866 1,866 — 1,324 1,324 — Mortgage 15 — 15 100 — 100 Installment 28 — 28 52 — 52 Residential real estate: Commercial 2,732 2,732 — 19,059 19,059 — Mortgage 25,992 — 25,992 27,607 — 27,607 HELOC 3,186 — 3,186 2,618 — 2,618 Installment 1,517 — 1,517 1,202 — 1,202 Consumer 4,220 — 4,220 4,065 — 4,065 Total loans $ 83,176 $ 48,144 $ 35,032 $ 92,233 $ 56,564 $ 35,669 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, 2018 and December 31, 2017 . 12/31/2018 12/31/2017 (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 $ 8,999 $ 3,713 $ — $ 19,899 $ 14,704 $ — Commercial real estate 26,663 26,213 — 18,974 18,060 — Construction real estate: Commercial 4,679 1,866 — 2,788 1,324 — Residential real estate: Commercial 2,691 2,374 — 19,346 19,012 — With an allowance recorded Commercial, financial and agricultural 13,736 11,407 2,169 5,394 3,335 681 Commercial real estate 2,255 2,213 86 137 82 2 Construction real estate: Commercial — — — — — — Residential real estate: Commercial 358 358 18 47 47 1 Total $ 59,381 $ 48,144 $ 2,273 $ 66,585 $ 56,564 $ 684 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, 2018 and December 31, 2017 , there were $8.8 million and $7.9 million , respectively, of partial charge-offs on loans individually evaluated for impairment with no related allowance recorded and $2.4 million and $2.1 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, 2018 and 2017 , of $2.3 million and $0.7 million , respectively. These loans with specific reserves had a recorded investment of $14.0 million and $3.5 million as of December 31, 2018 and 2017 , 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 subsequent to impairment on loans individually evaluated for impairment as of and for the years ended December 31, 2018 , 2017 , and 2016 : Year ended December 31, 2018 (In thousands) Recorded Investment as of December 31, 2018 Average recorded investment Interest income recognized Commercial, financial and agricultural $ 15,120 $ 21,000 $ 695 Commercial real estate 28,426 23,024 1,047 Construction real estate: Commercial 1,866 1,709 34 Residential real estate: Commercial 2,732 5,308 114 Consumer — — — Total $ 48,144 $ 51,041 $ 1,890 Year ended December 31, 2017 (In thousands) Recorded Investment as of December 31, 2017 Average recorded investment Interest income recognized Commercial, financial and agricultural $ 18,039 $ 23,154 $ 963 Commercial real estate 18,142 21,692 903 Construction real estate: Commercial 1,324 1,729 64 Residential real estate: Commercial 19,059 20,490 778 Consumer — 5 — Total $ 56,564 $ 67,070 $ 2,708 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: Commercial 2,226 5,503 66 Residential real estate: Commercial 23,102 24,341 2,942 Consumer — 3 — Total $ 70,426 $ 79,496 $ 4,777 The following tables present the aging of the recorded investment in past due loans as of December 31, 2018 and December 31, 2017 by class of loan. 12/31/2018 (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 $ 4,786 $ 1,375 $ 6,161 $ 1,071,228 $ 1,077,389 Commercial real estate 780 3,584 4,364 1,283,431 1,287,795 Construction real estate: Commercial — 1,635 1,635 174,466 176,101 Mortgage 133 20 153 70,539 70,692 Installment 28 19 47 2,393 2,440 Residential real estate: Commercial 683 1,104 1,787 429,093 430,880 Mortgage 13,210 8,553 21,763 1,113,742 1,135,505 HELOC 620 907 1,527 214,915 216,442 Installment 155 274 429 13,934 14,363 Consumer 9,524 2,131 11,655 1,284,237 1,295,892 Leases — — — 2,299 2,299 Total loans $ 29,919 $ 19,602 $ 49,521 $ 5,660,277 $ 5,709,798 (1) Includes an aggregate of $2.3 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans. (2) Includes an aggregate of $50.7 million of nonaccrual loans which are current in regards to contractual principal and interest payments. 12/31/2017 (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 $ 145 $ 1,043 $ 1,188 $ 1,056,678 $ 1,057,866 Commercial real estate 856 2,360 3,216 1,168,674 1,171,890 Construction real estate: Commercial 29 — 29 125,761 125,790 Mortgage 256 — 256 52,080 52,336 Installment 54 19 73 3,818 3,891 Residential real estate: Commercial 16 1,586 1,602 392,521 394,123 Mortgage 11,515 9,232 20,747 1,091,195 1,111,942 HELOC 616 876 1,492 202,660 204,152 Installment 239 253 492 18,087 18,579 Consumer 11,515 2,407 13,922 1,231,622 1,245,544 Leases — — — 3,029 3,029 Total loans $ 25,241 $ 17,776 $ 43,017 $ 5,346,125 $ 5,389,142 (1) Includes an aggregate of $1.8 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans. (2) Includes an aggregate of $56.1 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, 2018 and 2017 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, 2018 and December 31, 2017 for all commercial loans: 12/31/2018 (In thousands) 5 Rated 6 Rated Nonaccrual and Accruing TDRs Purchased Credit Impaired (1) Pass-Rated Recorded Investment Commercial, financial and agricultural* $ 11,509 $ 444 $ 15,194 $ 148 $ 1,050,094 $ 1,077,389 Commercial real estate* 2,707 — 28,426 3,059 1,253,603 $ 1,287,795 Construction real estate: Commercial 1,560 — 1,866 503 172,172 $ 176,101 Residential real estate: Commercial 272 41 2,732 251 427,584 $ 430,880 Leases — — — — 2,299 $ 2,299 Total Commercial Loans $ 16,048 $ 485 $ 48,218 $ 3,961 $ 2,905,752 $ 2,974,464 * 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. (1) Excludes loans acquired with deteriorated credit quality which are nonaccrual or TDRs due to additional credit deterioration or modification post acquisition. These loans had a recorded investment of $475,000 at December 31, 2018 . 12/31/2017 (In thousands) 5 Rated 6 Rated Nonaccrual and Accruing TDRs Purchased Credit Impaired Pass Rated Recorded Investment Commercial, financial and agricultural* $ 17,272 $ 153 $ 18,064 $ — $ 1,022,377 $ 1,057,866 Commercial real estate* 5,322 457 18,142 — 1,147,969 1,171,890 Construction real estate: Commercial 278 — 1,324 — 124,188 125,790 Residential real estate: Commercial 216 1 19,059 — 374,847 394,123 Leases — — — — 3,029 3,029 Total Commercial Loans $ 23,088 $ 611 $ 56,589 $ — $ 2,672,410 $ 2,752,698 * 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. Purchased Credit Impaired ("PCI") Loans In conjunction with the NewDominion acquisition, Park acquired loans with a book value of $277.9 million as of July 1, 2018. These loans were recorded at the initial fair value of $272.8 million . Loans acquired with deteriorated credit quality with a book value of $5.1 million were recorded at the initial fair value of $4.9 million . The carrying amount of loans acquired with deteriorated credit quality at December 31, 2018 was $4.4 million , while the outstanding customer balance was $4.6 million . At December 31, 2018 , no allowance for loan losses had been recognized related to the acquired impaired loans. The following table provides changes in accretable discount for loans acquired with deteriorated credit quality: For the Year Ended (in thousands) December 31, 2018 December 31, 2017 Balance at the beginning of the period $ — $ — Acquisitions 176 — Reductions due to change in projected cash flows — — Reclass from non-accretable difference — — Transfers out 16 — Accretion 16 — Balance at end of period $ 144 $ — TDRs Management classifies loans as TDRs when a borrower is experiencing financial difficulties and Park has granted a concession to the borrower as part of a modification or in the loan renewal process. In order to determine whether a borrower is experiencing financial difficulty, an evaluation is performed of the probability that the borrower will be in payment default on any of the borrower's debt in the foreseeable future without the modification. This evaluation is performed in accordance with the Company’s internal underwriting policy. Management’s policy is to modify loans by extending the term or by granting a temporary or permanent contractual interest rate below the market rate, not by forgiving debt. 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, 2018 and December 31, 2017 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. Quarterly, 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 and the terms of the renewal/modification are considered to be market terms based on the current risk characteristics of the borrower, 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, 2018 and 2017 , Park removed the TDR classification on $2.4 million and $0.5 million , respectively, of loans that met the requirements discussed above. At December 31, 2018 and 2017 , there were $24.6 million and $38.5 million , respectively, of TDRs included in the nonaccrual loan totals. At December 31, 2018 and 2017 , $19.2 million and $32.4 million , respectively, of these nonaccrual TDRs were performing in accordance with the terms of the restructured note. As of December 31, 2018 and 2017 , loans with a recorded investment of $15.2 million and $20.2 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, 2018 and 2017 , Park had commitments to lend $0.3 million and $1.3 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, 2018 and 2017 was $1.2 million and $0.5 million , respectively. Modifications made in 2017 and 2018 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 $0.2 million were recorded during the year ended December 31, 2018 , as a result of TDRs identified in the 2018 year. Additional specific reserves of $0.3 million were recorded during the year ended December 31, 2017 as a result of TDRs identified in the 2017 year. 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. The terms of certain other loans were modified during the years ended December 31, 2018 and 2017 that did not meet the definition of a TDR. Substandard commercial loans modified during the years ended December 31, 2018 and 2017 which did not meet the definition of a TDR had a total recorded investment of $368,000 and $106,000 , 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. Consumer loans modified during 2018 which did not meet the definition of a TDR had a total recorded investment as of December 31, 2018 of $20.9 million . Consumer loans modified during 2017 which did not meet the definition of a TDR had a total recorded investment as of December 31, 2017 of $8.9 million . 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, 2018 , 2017 and 2016 as well as the recorded investment of these contracts at December 31, 2018 , 2017 , and 2016 . 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, 2018 (In thousands) Number of Contracts Accruing Nonaccrual Recorded Investment Commercial, financial and agricultural 21 $ 28 $ 829 $ 857 Commercial real estate 17 414 3,172 3,586 Construction real estate: Commercial 1 — — — Mortgage — — — — Installment 2 10 — 10 Residential real estate: Commercial 3 54 363 417 Mortgage 25 842 854 1,696 HELOC 21 558 86 644 Installment 19 459 69 528 Consumer 283 204 1,249 1,453 Total loans 392 $ 2,569 $ 6,622 $ 9,191 Year ended December 31, 2017 (In thousands) Number of Contracts Accruing Nonaccrual Recorded Investment Commercial, financial and agricultural 29 $ 945 $ 2,770 $ 3,715 Commercial real estate 9 1,050 313 1,363 Construction real estate: Commercial — — — — Mortgage 1 — 8 8 Installment — — — — Residential real estate: Commercial 15 144 486 630 Mortgage 33 888 1,359 2,247 HELOC 19 474 102 576 Installment 11 251 43 294 Consumer 309 171 1,121 1,292 Total loans 426 $ 3,923 $ 6,202 $ 10,125 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: 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 Of those loans which were modified and determined to be a TDR during the year ended December 31, 2018 , $0.5 million were on nonaccrual status as of December 31, 2017 . Of those loans which were modified and determined to be a TDR during the year ended December 31, 2017 , $1.8 million were on nonaccrual status as of December 31, 2016 . 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 . 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, 2018 , December 31, 2017 , and December 31, 2016 . 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, 2018 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 3 $ 104 — $ — 7 $ 419 Commercial real estate — — 2 82 5 843 Construction real estate: Commercial — — — — — — Mortgage — — — — — — Installment — — — — — — Residential real estate: Commercial — — 2 117 7 848 Mortgage 8 518 6 467 15 1,201 HELOC 2 32 4 194 — — Installment 1 29 — — 1 3 Consumer 59 636 50 375 62 484 Leases — — — — — — Total loans 73 $ 1,319 $ 64 $ 1,235 97 $ 3,798 Of the $1.3 million in modified TDRs which defaulted during the year ended December 31, 2018 , $86,000 were accruing loans and $1.2 million were nonaccrual loans. Of the $1.2 million in modified TDRs which defaulted during the year ended December 31, 2017 , $180,000 were accruing loans and $1.1 million were nonaccrual loans. 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. Certain of the Corporation’s executive officers, directors and related entities of directors are loan customers of PNB. As of December 31, 2018 and 2017 , credit exposure aggregating approximately $35.9 million and $42.1 million , respectively, was outstanding to such parties. Of this total exposure, approximately $25.9 million and $31.1 million was outstanding at December 31, 2018 and 2017 , respectively, with the remaining balance representing available credit. During 2018 , new loans and advances on existing loans were made to these executive officers, directors and related entities of directors totaling $1.4 million and $4.9 million , respectively. These extensions of credit were offset by principal payments of $11.5 million . During 2017 , new loans and advances on existing loans were $1.6 million and $11.4 million , respectively. These extensions of credit were offset by principal payments of $11.4 million .

Allowance for Loan Losses

Allowance for Loan Losses	12 Months Ended
	Dec. 31, 2018
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. The following are factors management reviews on a quarterly or annual basis. • Historical Loss Factor: Management updated the historical loss calculation during the fourth quarter of 2018, incorporating annualized net charge-offs plus changes in specific reserves through December 31, 2018. With the addition of 2018 historical losses, management extended the historical loss period to 108 months from 96 months. The 108 month historical loss period captures all annual periods subsequent to June 2009, the end of the most recent recession, thus encompassing the full economic cycle to date. • Loss Emergence Period Factor: At least annually, management calculates the loss emergence period for each commercial loan segment. This loss emergence period is calculated based upon the average period of time it takes from the probable occurrence of a loss event to the credit being moved to nonaccrual. If the loss emergence period for any commercial loan segment is greater than one year, management applies additional general reserves to all performing loans within that segment of the commercial loan portfolio. The loss emergence period was last updated in the fourth quarter of 2018. • Loss Migration Factor: 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. Annually, management calculates a loss migration factor for each commercial loan segment for special mention and substandard credits based on a review of losses over the period of time a loan takes to migrate from pass-rated to impaired. The loss migration factor was last updated in the fourth quarter of 2018. • Environmental Loss Factor: Management has identified certain macroeconomic factors that trend in accordance with losses in Park’s commercial loan portfolio. These macroeconomic factors are reviewed quarterly and the adjustments made to the environmental loss factor impacting each segment in the performing commercial loan portfolio correlate to changes in the macroeconomic environment. The environmental loss factor was increased by 0.05% during the fourth quarter of 2018 due to consideration of the current economic environment in association to the 108 month historical loss period. The activity in the allowance for loan losses for the years ended December 31, 2018 , 2017 , and 2016 is summarized in the following tables. Year ended December 31, 2018 (In thousands) Commercial, financial and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for credit losses: Beginning balance $ 15,022 $ 9,601 $ 4,430 $ 9,321 $ 11,614 $ — $ 49,988 Charge-offs 2,796 281 72 441 9,962 — 13,552 Recoveries (1,221 ) (272 ) (712 ) (844 ) (4,078 ) (4 ) (7,131 ) Net charge-offs (recoveries) 1,575 9 (640 ) (403 ) 5,884 (4 ) 6,421 Provision (Recovery) 3,330 176 (607 ) (993 ) 6,043 (4 ) 7,945 Ending balance $ 16,777 $ 9,768 $ 4,463 $ 8,731 $ 11,773 — $ 51,512 Year ended December 31, 2017 (In thousands) Commercial, financial and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for credit losses: Beginning balance $ 13,434 $ 10,432 $ 5,247 $ 10,958 $ 10,553 $ — $ 50,624 Charge-offs 6,017 1,798 105 1,208 10,275 — 19,403 Recoveries (809 ) (810 ) (2,124 ) (1,863 ) (4,603 ) (1 ) (10,210 ) Net charge-offs (recoveries) 5,208 988 (2,019 ) (655 ) 5,672 (1 ) 9,193 Provision (Recovery) 6,796 157 (2,836 ) (2,292 ) 6,733 (1 ) 8,557 Ending balance $ 15,022 $ 9,601 $ 4,430 $ 9,321 $ 11,614 $ — $ 49,988 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 Loans collectively evaluated for impairment in the following tables include all performing loans at December 31, 2018 and 2017 , 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, 2018 and 2017 , 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, 2018 and 2017 was as follows: December 31, 2018 (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 $ 2,169 $ 86 $ — $ 18 $ — $ — $ 2,273 Collectively evaluated for impairment 14,608 9,682 4,463 8,713 11,773 — 49,239 Acquired with deteriorated credit quality — — — — — — — Total ending allowance balance $ 16,777 $ 9,768 $ 4,463 $ 8,731 $ 11,773 $ — $ 51,512 Loan balance: Loans individually evaluated for impairment $ 15,119 $ 28,418 $ 1,866 $ 2,732 $ — $ — $ 48,135 Loans collectively evaluated for impairment 1,057,520 1,251,579 245,909 1,790,637 1,292,136 2,273 5,640,054 Loans acquired with deteriorated credit quality (1) 147 3,048 499 249 — — 3,943 Total ending loan balance $ 1,072,786 $ 1,283,045 $ 248,274 $ 1,793,618 $ 1,292,136 $ 2,273 $ 5,692,132 Allowance for loan losses as a percentage of loan balance: Loans individually evaluated for impairment 14.35 % 0.30 % — % 0.66 % — % — % 4.72 % Loans collectively evaluated for impairment 1.38 % 0.77 % 1.81 % 0.49 % 0.91 % — % 0.87 % Loans acquired with deteriorated credit quality — % — % — % — % — % — % — % Total 1.56 % 0.76 % 1.80 % 0.49 % 0.91 % — % 0.90 % Recorded investment: Loans individually evaluated for impairment $ 15,120 $ 28,426 $ 1,866 $ 2,732 $ — $ — $ 48,144 Loans collectively evaluated for impairment 1,062,121 1,256,310 246,864 1,794,207 1,295,892 2,299 5,657,693 Loans acquired with deteriorated credit quality (1) 148 3,059 503 251 — — 3,961 Total ending recorded investment $ 1,077,389 $ 1,287,795 $ 249,233 $ 1,797,190 $ 1,295,892 $ 2,299 $ 5,709,798 (1) Excludes loans acquired with deteriorated credit quality which are individually evaluated for impairment due to additional credit deterioration post acquisition. These loans had a balance of $475,000 , a recorded investment of $475,000 , and zero allowance as of December 31, 2018 . December 31, 2017 (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 $ 681 $ 2 $ — $ 1 $ — $ — $ 684 Collectively evaluated for impairment 14,341 9,599 4,430 9,320 11,614 — 49,304 Total ending allowance balance $ 15,022 $ 9,601 $ 4,430 $ 9,321 $ 11,614 $ — $ 49,988 Loan balance: Loans individually evaluated for impairment $ 18,034 $ 18,131 $ 1,322 $ 19,058 $ — $ — $ 56,545 Loans collectively evaluated for impairment 1,035,419 1,149,476 180,148 1,706,166 1,241,736 2,993 5,315,938 Total ending loan balance $ 1,053,453 $ 1,167,607 $ 181,470 $ 1,725,224 $ 1,241,736 $ 2,993 $ 5,372,483 Allowance for loan losses as a percentage of loan balance: Loans individually evaluated for impairment 3.78 % 0.01 % — % 0.01 % — % — % 1.21 % Loans collectively evaluated for impairment 1.39 % 0.84 % 2.46 % 0.55 % 0.94 % — % 0.93 % Total 1.43 % 0.82 % 2.44 % 0.54 % 0.94 % — % 0.93 % Recorded investment: Loans individually evaluated for impairment $ 18,039 $ 18,142 $ 1,324 $ 19,059 $ — $ — $ 56,564 Loans collectively evaluated for impairment 1,039,827 1,153,748 180,693 1,709,737 1,245,544 3,029 5,332,578 Total ending recorded investment $ 1,057,866 $ 1,171,890 $ 182,017 $ 1,728,796 $ 1,245,544 $ 3,029 $ 5,389,142

Goodwill and Other Intangibles

Goodwill and Other Intangibles	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangibles	Goodwill and Other Intangible Assets The following table shows the activity in goodwill and other intangible assets for the year ended December 31, 2018. (in thousands) Goodwill Other Intangible Assets Total December 31, 2017 $ 72,334 $ — $ 72,334 Acquired goodwill and other intangible assets 40,405 7,549 47,954 Amortization — 578 578 December 31, 2018 $ 112,739 $ 6,971 $ 119,710 Goodwill impairment exists when a reporting unit's carrying value exceeds its fair value. At April 1, 2018, the Company's reporting unit, PNB, had positive equity and the Company elected to perform a qualitative assessment to determine if it was more likely than not that the fair value of the reporting unit exceeded its carrying value, including goodwill. The qualitative assessment indicated that it was more likely than not that the fair value of the reporting unit exceeded its carrying value, resulting in no impairment. There have been no subsequent circumstances or events triggering an additional evaluation. Acquired Intangible Assets The following table shows the balance of acquired intangible assets as of December 31, 2018. Park had no acquired intangible assets as of December 31, 2017. 2018 (in thousands) Gross Carrying Amount Accumulated Amortization Other intangible assets: Core deposit intangibles $ 6,249 $ 578 Trade name intangible 1,300 — Total $ 7,549 $ 578 Core deposit intangibles are being amortized, on an accelerated basis, over a period of ten years. The trade name intangible is an indefinite life asset and is not amortized, but rather is assessed, at least annually, for impairment. Amortization expense was $578,000 for the year ended December 31, 2018. There was no amortization expense during 2017. The following is a schedule of estimated amortization expense for each of the next five years: (in thousands) Total 2019 $ 1,234 2020 1,149 2021 869 2022 629 2023 521

Loans Held for Sale

Loans Held for Sale	12 Months Ended
	Dec. 31, 2018
Loans Held for Sale [Abstract]
Loans Held for Sale	Loans Held for Sale Mortgage loans held for sale are carried at their fair value. Mortgage loans held for sale were $4.2 million and $4.1 million at December 31, 2018 and 2017 , respectively. These amounts are included in "Loans" on the Consolidated Balance Sheets and in the residential real estate loan segments in Note 6 - Loans and Note 7 - Allowance for Loan Losses. The contractual balance was $4.1 million at both December 31, 2018 and 2017 . The gain expected upon sale was $60,000 and $55,000 at December 31, 2018 and 2017 , respectively. None of these loans were 90 days or more past due or on nonaccrual status as of December 31, 2018 or 2017 . During 2018, Park transferred certain non-performing loans held for investment, with a book balance of $174,000 , to the loans held for sale portfolio, and subsequently completed the sale of these non-performing loans held for sale, recognizing a net gain on sale of $2.8 million . No non-performing loans were held for sale or sold during 2017 or 2016.

Foreclosed and Repossessed Asse

Foreclosed and Repossessed Assets	12 Months Ended
	Dec. 31, 2018
Schedule of Assets Repossessed or Foreclosed, or loans in process of foreclosure [Line Items]
Real Estate Owned [Text Block]	Foreclosed and Repossessed Assets The carrying amount of foreclosed properties held at December 31, 2018 and December 31, 2017 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, 2018 December 31, 2017 OREO: Commercial real estate $ 2,359 $ 7,888 Construction real estate 1,108 4,852 Residential real estate 836 1,450 Total OREO $ 4,303 $ 14,190 Loans in process of foreclosure: Residential real estate $ 2,346 $ 2,948 In addition to real estate, Park may also repossess different types of collateral. As of December 31, 2018 and December 31, 2017 , Park had $4.0 million and $5.5 million in other repossessed assets which are included in "Other assets" on the Consolidated Balance Sheets. As of December 31, 2018 , this asset largely consisted of an aircraft acquired as part of a loan workout. As of December 31, 2017 , this asset largely consisted of lease receivables acquired as part of a loan workout.

Premises And Equipment

Premises And Equipment	12 Months Ended
	Dec. 31, 2018
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) 2018 2017 Land $ 20,062 $ 19,603 Buildings 79,706 77,711 Equipment, furniture and fixtures 65,659 55,799 Leasehold improvements 4,791 3,273 Total $ 170,218 $ 156,386 Less accumulated depreciation (110,447 ) (100,485 ) Premises and equipment, net $ 59,771 $ 55,901 Depreciation expense amounted to $8.6 million , $8.6 million and $8.4 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. The Corporation leases certain premises and equipment accounted for as operating leases. The following is a schedule of the future minimum rental payments, before considering renewals, required for the next five years under such leases with initial terms in excess of one year: (In thousands) 2019 $ 2,839 2020 2,072 2021 1,653 2022 1,576 2023 1,420 Thereafter 810 Total $ 10,370 Rent expense for Park was $2.4 million , $2.0 million and $2.1 million , for the years ended December 31, 2018 , 2017 and 2016 , respectively.

Investment in Qualified Afforda

Investment in Qualified Affordable Housing	12 Months Ended
	Dec. 31, 2018
Investments in Qualified Affordable Housing [Abstract]
Equity Method Investments and Joint Ventures Disclosure [Text Block]	Investments 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 has 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, 2018 and 2017 . (In thousands) December 31, 2018 December 31, 2017 Affordable housing tax credit investments $ 50,347 $ 49,669 Unfunded commitments 22,282 14,282 Commitments are funded when capital calls are made by the general partner. Park expects that the commitments as of December 31, 2018 will be funded between 2019 and 2029. During the years ended December 31, 2018 , 2017 and 2016 , Park recognized amortization expense of $ 7.3 million , $10.3 million and $7.3 million , respectively, which was included within the provision for income taxes. Included in the $10.3 million of amortization expense during the year ended December 31, 2017 was $3.1 million in accelerated amortization as a result of tax reform as discussed in Note 20 - Income Taxes. This reflects an overall reduction in the total projected tax benefits of the affordable housing tax credit investments as a result of the reduction in the federal corporate income tax rate to 21% . For the years ended December 31, 2018 , 2017 and 2016 , Park recognized tax credits and other benefits from its affordable housing tax credit investments of $9.0 million , $9.4 million and $9.4 million , respectively.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2018
Deposits [Abstract]
Deposits	Deposits At December 31, 2018 and 2017 , non-interest bearing and interest bearing deposits were as follows: December 31 (In thousands) 2018 2017 Non-interest bearing $ 1,804,881 $ 1,633,941 Interest bearing 4,455,979 4,183,385 Total $ 6,260,860 $ 5,817,326 At December 31, 2018 , the maturities of time deposits were as follows: (In thousands) 2019 $ 670,674 2020 248,938 2021 55,873 2022 47,190 2023 20,405 After 5 years 97 Total $ 1,043,177 At December 31, 2018 and 2017, respectively, Park had approximately $19.7 million and $24.9 million of deposits received from executive officers, directors and related entities of directors. Time deposits that meet or exceed the FDIC Insurance limit of $250,000 at December 31, 2018 and 2017 were $62.9 million and $38.5 million , respectively.

Repurchase Agreement Borrowings

Repurchase Agreement Borrowings	12 Months Ended
	Dec. 31, 2018
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 are included in short-term borrowings on the Consolidated Balance Sheets. All repurchase agreements are subject to the terms and conditions of repurchase/security agreements between Park and the client and are accounted for as secured borrowings. Park's repurchase agreements consist of customer accounts and securities which are pledged on an individual security basis. At December 31, 2018 and December 31, 2017 , Park's repurchase agreement borrowings totaled $165 million and $183 million , respectively. These borrowings were collateralized with U.S. government and agency securities with a fair value of $272 million and $213 million at December 31, 2018 and December 31, 2017 , respectively. Declines in the value of the collateral would require Park to pledge additional securities. As of December 31, 2018 and December 31, 2017 , Park had $933 million and $975 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, 2018 and December 31, 2017 : December 31, 2018 (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 $ 164,966 $ — $ — $ — $ 164,966 December 31, 2017 (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 $ 182,185 $ — $ — $ 1,104 $ 183,289 See Note 15 - Short-Term Borrowings for additional information related to repurchase agreements.

Short-Term Borrowings

Short-Term Borrowings	12 Months Ended
	Dec. 31, 2018
Short-term Debt [Abstract]
Short-Term Borrowings	Short-Term Borrowings Short-term borrowings were as follows: December 31 (In thousands) 2018 2017 Securities sold under agreements to repurchase $ 164,966 $ 183,289 FHLB advances 57,000 208,000 Total short-term borrowings $ 221,966 $ 391,289 The outstanding balances for all short-term borrowings as of December 31, 2018 and 2017 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 2018 Ending balance $ 164,966 $ 57,000 Highest month-end balance 199,729 256,000 Average daily balance 172,774 44,553 Weighted-average interest rate: As of year-end 0.49 % 2.45 % Paid during the year 0.42 % 1.95 % 2017 Ending balance $ 183,289 $ 208,000 Highest month-end balance 230,905 208,000 Average daily balance 205,269 23,924 Weighted-average interest rate: As of year-end 0.41 % 1.64 % Paid during the year 0.35 % 1.16 % During 2017 and 2018 , outstanding FHLB advances were collateralized by investment securities owned by PNB and by various loans pledged under a blanket agreement by PNB. At December 31, 2018 and 2017, $22 million and $25 million , respectively, of investment securities were pledged as collateral for FHLB advances. At December 31, 2018 and 2017 , $1,646 million and $1,789 million , respectively, of commercial real estate and residential mortgage loans were pledged under a blanket agreement to the FHLB by PNB. See Note 14 - Repurchase Agreement Borrowings for information related to investment securities collateralizing repurchase agreements.

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt is listed below: December 31, 2018 2017 (In thousands) Outstanding Balance Average Rate Outstanding Balance Average Rate Total Federal Home Loan Bank advances by year of maturity: 2018 $ — — % $ 150,000 2.04 % 2019 100,000 1.92 % 100,000 1.92 % 2020 50,000 2.04 % 50,000 2.04 % 2021 100,000 1.96 % 100,000 1.96 % 2022 50,000 3.01 % — — % 2023 100,000 3.40 % 100,000 3.40 % Thereafter — — % — — % Total $ 400,000 2.45 % 500,000 2.27 % 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 was 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% . The entire $25 million prepayment penalty had been amortized by December 31, 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 was 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% . The entire $3.2 million prepayment penalty had been amortized by December 31, 2017. 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 for the year ended December 31, 2016. These advances had an interest rate of 3.15% and a maturity date of November 13, 2023. Park had no long-term debt at December 31, 2018 with a contractual maturity longer than five years. At December 31, 2018 and 2017 , FHLB advances were collateralized by investment securities owned by PNB and by various loans pledged under a blanket agreement by PNB. At December 31, 2018 and 2017 , $22 million and $25 million , respectively, of investment securities were pledged as collateral for FHLB advances. At December 31, 2018 and 2017 , $1,646 million and $1,789 million , respectively, of commercial real estate and residential mortgage loans were pledged under a blanket agreement to the FHLB by PNB.

Subordinated Notes

Subordinated Notes	12 Months Ended
	Dec. 31, 2018
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 junior subordinated notes 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 junior subordinated notes in December 2035, or upon earlier redemption as provided in the junior subordinated notes. Since December 30, 2010, Park has had the right to redeem the junior subordinated notes purchased by Trust I in whole or in part. As specified in the indenture, if the junior subordinated 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 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 were intended to qualify as Tier 2 capital under applicable rules and regulations of the FRB. The 2012 Notes could not be prepaid in any amount prior to April 21, 2017; however, subsequent to that date, Park could prepay, without penalty, all or a portion of the principal amount outstanding. On April 24, 2017, Park prepaid in full the $30 million outstanding aggregate principal amount of the 2012 Notes, plus accrued interest on the 2012 Notes in the aggregate amount of $140,000 .

Share-Based Compensation

Share-Based Compensation	12 Months Ended
	Dec. 31, 2018
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 made 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 ("SARs"), restricted common shares ("Restricted Stock"), restricted stock unit awards that may be settled in common shares, cash or a combination of the two ("Restricted Stock Units"), unrestricted common shares ("Other Stock-Based Awards") and cash-based awards. Under the 2013 Incentive Plan, 600,000 common shares were authorized to be delivered in connection with grants under the 2013 Incentive Plan. The common shares to be delivered under the 2013 Incentive Plan are to 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. At December 31, 2018, there were 92,404 common shares subject to performance-based Restricted Stock Units (“PBRSUs”) granted under the 2013 Incentive Plan. The Park National Corporation 2017 Long-Term Incentive Plan for Employees (the "2017 Employees LTIP") was adopted by the Board of Directors of Park on January 23, 2017 and was approved by Park's shareholders at the Annual Meeting of Shareholders on April 24, 2017. The 2017 Employees LTIP makes equity-based awards and cash-based awards available for grant to participants in the form of incentive stock options, nonqualified stock options, SARs, Restricted Stock, Restricted Stock Units, Other Stock-Based Awards and cash-based awards. Under the 2017 Employees LTIP, 750,000 common shares are authorized to be delivered in connection with grants under the 2017 Employees LTIP. The common shares to be delivered under the 2017 Employees LTIP are to 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. At December 31, 2018, 689,773 common shares were available for future grants under the 2017 Employee LTIP. The Park National Corporation 2017 Long-Term Incentive Plan for Non-Employee Directors (the "2017 Non-Employee Directors LTIP") was adopted by the Board of Directors of Park on January 23, 2017 and was approved by Park's shareholders at the Annual Meeting of Shareholders on April 24, 2017. The 2017 Non-Employee Directors LTIP makes equity-based awards and cash-based awards available for grant to participants in the form of nonqualified stock options, SARs, Restricted Stock, Restricted Stock Units, Other Stock-Based Awards, and cash-based awards. Under the 2017 Non-Employee Directors LTIP, 150,000 common shares are authorized to be delivered in connection with grants under the 2017 Non-Employee Directors LTIP. The common shares to be delivered under the 2017 Non-Employee Directors LTIP are to 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. At December 31, 2018, 127,200 common shares were available for future grants under the 2017 Non-Employee Directors LTIP. The 2017 Employees LTIP and the 2017 Non-Employee Directors LTIP have replaced the provisions of the 2013 Incentive Plan with respect to the grant of future awards. As a result of the approval of the 2017 Employees LTIP and the 2017 Non-Employee Directors LTIP, Park will not grant any additional awards under the 2013 Incentive Plan after April 24, 2017. Awards made under the 2013 Incentive Plan prior to April 24, 2017 will remain in effect in accordance with their respective terms. During 2018 and 2017, Park granted 11,650 and 11,150 common shares, respectively, to directors of Park and to directors of PNB (and its divisions) under the 2017 Non-Employee Directors LTIP. During 2016, Park granted 9,950 common shares to directors of Park and to directors of PNB (and its divisions) under the 2013 Incentive Plan. The common shares granted to directors were not subject to a vesting period and resulted in expense of $1.1 million , $1.2 million , and $950,000 in 2018, 2017, and 2016, respectively, which is included in professional fees and services on the Consolidated Statements of Income. During 2018, the Compensation Committee of the Board of Directors of Park granted awards of PBRSUs, under the 2017 Employees LTIP, covering an aggregate of 48,053 common shares to certain employees of Park and its subsidiaries. Additionally, on July 1, 2018, Park granted 13,637 time-based restricted stock units ("TBRSUs") to certain NewDominion employees. During 2017 and 2016, the Compensation Committee of the Board of Directors of Park granted awards of PBRSUs covering an aggregate of 45,788 common shares and 41,550 common shares, respectively, under the 2013 Incentive Plan, to certain employees of Park and its subsidiaries. The number of PBRSUs earned or settled will depend on the level of achievement with respect to certain performance criteria and are also subject to service-based vesting requirements. The number of TBRSUs earned or settled are subject to service-based vesting. A summary of changes in the common shares subject to nonvested PBRSUs and TBRSUs for the years ended December 31, 2018 and 2017 follows: Common shares subject to PBRSUs and TBRSUs Nonvested at January 1, 2017 85,425 Granted 45,788 Vested (9,674 ) Forfeited (3,021 ) Adjustment for performance conditions of PBRSUs (1) (1,802 ) Nonvested at January 1, 2018 116,716 Granted 61,690 Vested (18,800 ) Forfeited (4,655 ) Adjustment for performance conditions of PBRSUs (1) (2,320 ) Nonvested at December 31, 2018 (2) 152,631 (1) The number of PBRSUs earned depends on the level of achievement with respect to certain performance criteria. Adjustment herein represents the difference between the maximum number of common shares which could be earned and the actual number earned for those PBRSUs as to which the performance period was completed. (2) Nonvested amount herein represents the maximum number of nonvested PBRSUs and TBRSUs. As of December 31, 2018, 140,134 PBRSUs and TBRSUs are expected to vest. On March 31, 2018, an aggregate of 18,800 of the PBRSUs granted in 2014 and 2015 vested in full due to the level of achievement with respect to certain performance criteria and the satisfaction of the service-based vesting requirement. A total of 5,879 common shares were withheld to satisfy employee income tax withholding obligations. This resulted in a net number of 12,921 common shares being issued to employees of Park. On March 31, 2017, 9,674 PBRSUs granted in 2014 vested in full due to the level of achievement with respect to certain performance criteria and the satisfaction of the service-based vesting requirement. A total of 3,293 common shares were withheld to pay employee income taxes. This resulted in a net number of 6,381 common shares being issued to employees of Park. Share-based compensation expense of $4.0 million , $2.7 million and $1.9 million was recognized for the years ended December 31, 2018 , 2017 and 2016, respectively, related to PBRSU and TBRSU awards to employees. The following table details expected additional share-based compensation expense related to PBRSUs and TBRSUs currently outstanding: (In thousands) 2019 $ 3,580 2020 2,390 2021 1,010 2022 223 Total $ 7,203

Benefit Plans

Benefit Plans	12 Months Ended
	Dec. 31, 2018
Defined Benefit Plan [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 was no pension contribution in 2018. During 2017, management contributed $15.0 million , all of which was deductible on the 2017 tax return. There is no contribution expected in 2019. Using accrual measurement dates of December 31, 2018 and 2017 , plan assets and benefit obligation activity for the Pension Plan are listed below: (In thousands) 2018 2017 Change in fair value of plan assets Fair value at beginning of measurement period $ 195,735 $ 167,047 Actual return on plan assets (8,118 ) 21,573 Employer contributions — 15,000 Benefits paid (10,540 ) (7,885 ) Fair value at end of measurement period $ 177,077 $ 195,735 Change in benefit obligation Projected benefit obligation at beginning of measurement period $ 138,698 $ 114,455 Service cost 6,547 5,270 Interest cost 5,236 5,085 Actuarial (gain) loss (16,413 ) 21,773 Benefits paid (10,540 ) (7,885 ) Projected benefit obligation at the end of measurement period $ 123,528 $ 138,698 Funded status at end of year (fair value of plan assets less benefit obligation) $ 53,549 $ 57,037 The change in the actuarial (gain) loss from an actuarial loss of $21.8 million as of December 31, 2017 to an actuarial gain of $16.4 million as of December 31, 2018, was the result of changes in actuarial assumptions partially offset by lower than projected returns on pension plan assets during 2018. Changes in actuarial assumptions included a change in the discount rate from 3.89% to 4.60% as well as a change in the generational mortality improvement projection scale from scale MP-2017 to scale MP-2018. 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 2018 2017 Equity securities 50% - 100% 82 % 79 % Fixed income and cash equivalents remaining balance 18 % 21 % 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% at both December 31, 2018 and December 31, 2017 . 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 $104.9 million and $116.0 million at December 31, 2018 and 2017 , 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, 2018 and 2017 , the fair value of the 115,800 common shares held by the Pension Plan was $9.8 million , or $84.95 per share and $12.0 million , or $104.00 per share, respectively. The weighted average assumptions used to determine benefit obligations at December 31, 2018 , 2017 and 2016 were as follows: 2018 2017 2016 Discount rate 4.60 % 3.89 % 4.58 % 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 % 4.00 % 4.00 % 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): 2019 $ 8,428 2020 8,733 2021 9,787 2022 10,324 2023 9,698 2024-2028 51,726 Total $ 98,696 The following table shows ending balances of accumulated other comprehensive loss at December 31, 2018 and 2017 . (In thousands) 2018 2017 Prior service cost $ — $ — Net actuarial loss (37,560 ) (33,799 ) Total (37,560 ) (33,799 ) Deferred taxes 7,888 7,098 Disparate tax effect (1) — 3,175 Accumulated other comprehensive loss $ (29,672 ) $ (23,526 ) (1) In accordance with U.S. GAAP, Park revalued the deferred tax asset related to net actuarial loss upon the enactment of the Tax Cuts and Jobs Act on December 22, 2017. U.S. GAAP does not allow for a similar revaluation of accumulated other comprehensive loss, resulting in a disparate tax effect. Park adopted ASU 2018-02 on January 1, 2018, which allows for the reclassification of the disparate tax effect to retained earnings. Using actuarial measurement dates of December 31 for 2018 , 2017 and 2016 , components of net periodic benefit income and other amounts recognized in other comprehensive income were as follows: (In thousands) 2018 2017 2016 Affected Line Item in the Consolidated Statements of Income Components of net periodic benefit income and other amounts recognized in other comprehensive income (loss) Service cost $ (6,547 ) $ (5,270 ) $ (5,055 ) Employee benefits Interest cost (5,236 ) (5,085 ) (4,869 ) Other components of net periodic benefit income Expected return on plan assets 13,417 11,455 10,950 Other components of net periodic benefit income Recognized net actuarial loss (1,361 ) (576 ) (773 ) Other components of net periodic benefit income Net periodic benefit income $ 273 $ 524 $ 253 Net (loss) gain $ (5,122 ) $ (11,698 ) $ 168 Amortization of net loss 1,361 576 773 Total recognized in other comprehensive income (loss) (3,761 ) (11,122 ) 941 Total recognized in net benefit income and other comprehensive income (loss) $ (3,488 ) $ (10,598 ) $ 1,194 There are no estimated prior service costs for the Pension Plan to be amortized from accumulated other comprehensive loss into net periodic benefit cost over the next fiscal year. The estimated net actuarial loss expected to be recognized in the next fiscal year is $1.9 million . The weighted average assumptions used to determine net periodic benefit income for the years ended December 31, 2018 , 2017 and 2016 are listed below: 2018 2017 2016 Discount rate 3.89 % 4.58 % 4.88 % 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 % 4.00 % 3.00 % Ages 50 and over 3.00 % 3.00 % 3.00 % Expected long-term return on plan assets 7.00 % 7.00 % 7.25 % The Pension Plan maintains cash in a PNB savings account. The Pension Plan cash balance was $2.0 million at December 31, 2018 . 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, 2018 was $177.1 million . At December 31, 2018 , $147.1 million of equity investments and cash in the Pension Plan were categorized as Level 1 inputs; $30.0 million of Pension Plan investments in corporate (U.S. large cap), U.S. Government sponsored entity bonds and marketable CD's 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 $195.7 million at December 31, 2017 . At December 31, 2017 , $169.6 million of investments in the Pension Plan were categorized as Level 1 inputs; $26.1 million were categorized as Level 2; and no investments were categorized as Level 3. Salary Deferral Plan The Corporation has a voluntary salary deferral plan (the Corporation's Employees Stock Ownership 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 $3.0 million , $1.3 million , and $1.3 million for 2018 , 2017 and 2016 , respectively. Supplemental Executive Retirement Plan 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 income tax law. The accrued benefit cost for the SERP Agreements totaled $10.3 million and $9.9 million for 2018 and 2017 , respectively. The expense for the Corporation was $1.0 million for 2018 , $1.7 million for 2017 and $1.5 million for 2016 .

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes On December 22, 2017, “H.R.1,” known as the “Tax Cuts and Jobs Act", was signed into law. Among other things, the Tax Cuts and Jobs Act permanently lowered the corporate federal corporate income tax rate to 21% from the then existing maximum rate of 35% , effective January 1, 2018. As a result of the reduction of the federal corporate income tax rate to 21% , U.S. GAAP required companies to revalue certain tax-related assets and liabilities as of the date of enactment, with the resulting tax effects accounted for in the reporting period of enactment. This revaluation impacted Park’s net deferred tax liabilities and qualified affordable housing tax credit investments. This revaluation resulted in a $1.9 million tax benefit as a result of the revaluation of Park’s net deferred tax liabilities offset by $3.1 million in tax expense as a result of the accelerated amortization of qualified affordable housing tax credit investments. The net effect of the Tax Cuts and Jobs Act was an increase to federal income tax expense at Park of $1.2 million in the fourth quarter of 2017 . Also on December 22, 2017, the U.S. Securities and Exchange Commission (“SEC”) released Staff Accounting Bulletin No. 118 (“SAB 118”) to address any uncertainty or diversity of views in practice in accounting for the income tax effects of the Act in situations where a registrant does not have the necessary information available, prepared, or analyzed in reasonable detail to complete this accounting in the reporting period that includes the enactment date. SAB 118 allowed for a measurement period not to extend beyond one year from the Act’s enactment date to complete the necessary accounting. As of December 31, 2017, management recorded provisional amounts of deferred income taxes using reasonable estimates in one area where information necessary to complete the accounting was not available, prepared, or analyzed. Park's deferred tax liability for temporary differences associated with equity investments in partnerships was awaiting receipt of Schedules K-1 from outside preparers, which was necessary to determine our 2017 tax impact from these investments. Management made no adjustments to deferred tax assets representing future deductions for accrued compensation that may be subject to new limitations under Internal Revenue Code Section 162(m) which, generally, limits the annual deduction for certain compensation paid to certain employees to $1.0 million . All of these matters were finalized in 2018 with no material impact to the Corporation's federal income tax expense. 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) 2018 2017 Deferred tax assets: Allowance for loan losses $ 10,818 $ 10,498 Accumulated other comprehensive loss – Pension plan 7,888 7,098 Accumulated other comprehensive loss – Unrealized losses on securities 5,347 946 Deferred compensation 2,896 2,744 OREO valuation adjustments 1,028 1,327 Net deferred loan fees 1,221 1,115 Deferred contract bonus 556 645 Nonvested equity-based compensation 1,567 1,069 Fixed assets 206 877 Net operating loss ("NOL") carryforward 4,663 — Other 824 1,230 Total deferred tax assets $ 37,014 $ 27,549 Deferred tax liabilities: Deferred investment income 6,120 6,120 Pension Plan 19,133 19,076 MSRs 2,137 2,034 Partnership adjustments 630 460 Purchase accounting adjustments 769 166 Other 210 198 Total deferred tax liabilities $ 28,999 $ 28,054 Net deferred tax asset (liability) $ 8,015 $ (505 ) At of December 31, 2018 , the Corporation has $19.4 million million of federal net operating loss carryforwards, and $19.3 million of North Carolina net operating loss carryforwards available that were obtained through the acquisition of NewDominion, the utilization of which are limited under Internal Revenue Code Section 382. These net operating losses begin to expire in 2030. The related deferred tax asset is $4.7 million . 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, 2018 or 2017 deferred tax assets in accordance with GAAP since it is more likely than not that the deferred tax asset will be fully utilized in future periods. The components of the provision for federal income taxes are shown below: December 31, (In thousands) 2018 2017 2016 Currently payable Federal $ 12,700 $ 20,660 $ 28,879 State 352 — — Amortization of qualified affordable housing projects 7,322 10,278 7,300 Deferred Federal 481 3,289 581 State 57 — — Total $ 20,912 $ 34,227 $ 36,760 The following is a reconciliation of income tax expense to the amount computed at the statutory federal corporate income tax rate of 21% for the year ended December 31, 2018 , and 35% for the years ended December 31, 2017 and 2016 . 2018 2017 2016 Statutory federal corporate income tax rate 21.0 % 35.0 % 35.0 % Changes in rates resulting from: Tax exempt interest income, net of disallowed interest (1.8 )% (2.8 )% (1.3 )% Bank owned life insurance (1.1 )% (1.4 )% (1.2 )% Investments in qualified affordable housing projects, net of tax benefits (1.3 )% (1.9 )% (1.7 )% KSOP dividend deduction (0.6 )% (1.0 )% (1.0 )% Impact of the Tax Cuts and Jobs Act (1) — % 1.0 % — % Non-taxable gain on NewDominion common stock (0.6 )% — % — % State income tax, net of federal tax benefits 0.2 % — % — % Other 0.1 % — % 0.1 % Effective tax rate 15.9 % 28.9 % 29.9 % (1) As a result of the reduction of the federal corporate income tax rate to 21% , GAAP required companies to re-value certain tax-related assets and liabilities as of the date of enactment, with the resulting tax effects accounted for in the reporting period of enactment. This re-valuation resulted in a $1.9 million tax benefit as a result of the revaluation of Park’s net deferred tax liabilities and $3.1 million in tax expense as a result of accelerated amortization of qualified affordable housing tax credit investments. The net effect of the Tax Cuts and Jobs Act was an increase to federal income tax expense at Park of $1.2 million . 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. Park is also subject to state income tax in various states, including the state of North Carolina. State income tax expense is included in “Income taxes” on Park’s Consolidated Statements of Income. Park’s 2018 state income tax expense was $409,000 . Unrecognized Tax Benefits The following is a reconciliation of the beginning and ending amount of unrecognized tax benefits. (In thousands) 2018 2017 2016 January 1 Balance $ 664 $ 633 $ 558 Additions based on tax positions related to the current year 10 117 117 Additions for tax positions of prior years 781 — 38 Reductions for tax positions of prior years — (9 ) — Reductions due to statute of limitations (229 ) (77 ) (80 ) December 31 Balance $ 1,226 $ 664 $ 633 The amount of unrecognized tax benefits that, if recognized, would favorably affect the effective income tax rate in the future periods at December 31, 2018 , 2017 and 2016 was $1.1 million , $506,000 and $482,000 , 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, 2018 , 2017 , and 2016 was $79,500 , $3,500 , and $1,500 , respectively. The amount accrued for interest and penalties at December 31, 2018 , 2017 and 2016 was $153,500 , $74,000 and $70,500 , respectively. Park and its subsidiaries are subject to U.S. federal income tax and income tax in various state jurisdictions. The Corporation is subject to routine audits of tax returns by the Internal Revenue Service and states in which we conduct business. No material adjustments have been made on closed federal and state tax audits. Generally, all tax years ended prior to December 31, 2015 are closed to examination by federal and state taxing authorities.

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2018
Other Comprehensive Income (Loss) [Abstract]
Other Comprehensive Income (Loss)	Other Comprehensive Loss Other comprehensive income (loss) components, net of income tax, are shown in the following table for the years ended December 31, 2018 , 2017 and 2016 . Year ended December 31, (in thousands) Changes in Pension Plan assets and benefit obligations Unrealized gains and losses on AFS debt securities Total Beginning balance at January 1, 2018, as previously presented $ (23,526 ) $ (2,928 ) $ (26,454 ) Cumulative effect of change in accounting principle for marketable equity securities, net of tax — (995 ) (995 ) Beginning balance at January 1, 2018, as adjusted (23,526 ) (3,923 ) (27,449 ) Reclassification of disproportionate income tax effects (3,175 ) (631 ) (3,806 ) Net current period activity Other comprehensive loss before reclassifications (4,046 ) (17,586 ) (21,632 ) Amounts reclassified from accumulated other comprehensive loss 1,075 2,024 3,099 Net current period other comprehensive loss (2,971 ) (15,562 ) (18,533 ) Ending balance at December 31, 2018 $ (29,672 ) $ (20,116 ) $ (49,788 ) Beginning balance at January 1, 2017 $ (14,740 ) $ (3,005 ) $ (17,745 ) Other comprehensive (loss) gain before reclassifications (9,241 ) 1,261 (7,980 ) Amounts reclassified from accumulated other comprehensive loss 455 (1,184 ) (729 ) Net current period other comprehensive (loss) income (8,786 ) 77 (8,709 ) Ending balance at December 31, 2017 $ (23,526 ) $ (2,928 ) $ (26,454 ) 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 ) The following table provides information concerning amounts reclassified out of accumulated other comprehensive loss for the years ended December 31, 2018 , 2017 and 2016 : Amount Reclassified from Accumulated Other Comprehensive Loss Affected Line Item in the Consolidated Statements of Income (In thousands) 2018 2017 2016 Amortization of defined benefit pension items Amortization of net loss 1,361 576 773 Employee benefits Income before income taxes 1,361 576 773 Income before income taxes Income taxes 286 121 271 Income taxes Net of income tax $ 1,075 $ 455 $ 502 Net income Unrealized gains & losses on available for sale securities Loss (gain) on the sale of investment securities $ 2,562 $ (1,821 ) $ — Net (loss) gain on the sale of investment securities Income before income taxes 2,562 (1,821 ) — Income before income taxes Income taxes 538 (637 ) — Income taxes Net of income tax $ 2,024 $ (1,184 ) $ — Net income

Earnings Per Common Share

Earnings Per Common Share	12 Months Ended
	Dec. 31, 2018
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 PBRSUs and TBRSUs. The following table sets forth the computation of basic and diluted earnings per common share: Year ended December 31 2018 2017 2016 Numerator: Net income $ 110,387 $ 84,242 $ 86,135 Denominator: Weighted-average common shares outstanding 15,488,982 15,295,573 15,332,553 Effect of dilutive PBRSUs and TBRSUs 122,507 94,779 72,607 Weighted-average common shares outstanding adjusted for the effect of dilutive PBRSUs and TBRSUs 15,611,489 15,390,352 15,405,160 Earnings per common share: Basic earnings per common share $ 7.13 $ 5.51 $ 5.62 Diluted earnings per common share $ 7.07 $ 5.47 $ 5.59 Park awarded 48,053 , 45,788 and 41,550 PBRSUs to certain employees during the years ended December 31, 2018, 2017 and 2016, respectively. On July 1, 2018, Park issued 435,457 common shares to complete its acquisition of NewDominion and granted 13,637 TBRSUs to NewDominion employees. These common shares are included in average common shares outstanding beginning on that date. During the years ended December 31, 2018 and 2017, Park repurchased 50,000 and 70,000 common shares, respectively, to fund the PBRSUs, TBRSUs and common shares awarded to directors of Park and to directors of PNB (and its divisions). No common shares were repurchased during 2016.

Dividend Restrictions

Dividend Restrictions	12 Months Ended
	Dec. 31, 2018
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, 2018 , approximately $86.2 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, 2018
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) 2018 2017 Loan commitments $ 1,012,820 $ 893,205 Standby letters of credit 13,334 13,421 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, Kentucky and North Carolina with exception of nationwide aircraft loans and nationwide asset based lending to consumer finance companies. 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, 2018
Transfers and Servicing of Financial Assets [Abstract]
Loan Servicing	Loan Servicing Park serviced sold mortgage loans of $1,389 million at December 31, 2018 , compared to $1,371 million at December 31, 2017 and $1,330 million at December 31, 2016 . At December 31, 2018 , $2.5 million of the sold mortgage loans were sold with recourse compared to $3.0 million at December 31, 2017 and $4.1 million at December 31, 2016 . Management closely monitors the delinquency rates on the mortgage loans sold with recourse. As of December 31, 2018 and 2017, management had established a reserve of $60,000 and $270,000 , 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 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 MSRs is included within other service income in the Consolidated Statements of Income. Activity for MSRs and the related valuation allowance follows: December 31 (In thousands) 2018 2017 2016 MSRs: Carrying amount, net, beginning of year $ 9,688 $ 9,266 $ 9,008 Additions 1,591 1,941 2,286 Amortization (1,499 ) (1,624 ) (1,835 ) Change in valuation allowance 398 105 (193 ) Carrying amount, net, end of year $ 10,178 $ 9,688 $ 9,266 Valuation allowance: Beginning of year $ 630 $ 735 $ 542 Change in valuation allowance (398 ) (105 ) 193 End of year $ 232 $ 630 $ 735 The fair value of MSRs was $11.0 million and $9.7 million at December 31, 2018 and 2017, respectively. The fair value of MSRs at December 31, 2018 was established using a discount rate of 12% and constant prepayment speeds ranging from 4.80% to 17.82% . The fair value of MSRs at December 31, 2017 was established using a discount rate of 13% and constant prepayment speeds ranging from 6.54% to 17.10% . Servicing fees included in other service income were $3.6 million , $3.5 million and $3.4 million for the years ended December 31, 2018, 2017 and 2016, respectively.

Fair Values

Fair Values	12 Months Ended
	Dec. 31, 2018
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 (exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction 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 in accordance with Park's valuation requirements under 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, 2018 using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2018 Assets Investment securities: U.S. Government sponsored entities’ asset-backed securities — 1,003,421 — 1,003,421 Equity securities 1,225 — 424 1,649 Mortgage loans held for sale — 4,158 — 4,158 Mortgage IRLCs — 87 — 87 Liabilities Fair value swap $ — $ — $ 226 $ 226 Fair Value Measurements at December 31, 2017 using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2017 Assets Investment securities: Obligations of U.S. Treasury and other U.S. Government sponsored entities $ — $ 242,720 $ — $ 242,720 U.S. Government sponsored entities’ asset-backed securities — 849,161 — 849,161 Equity securities 1,518 — 417 1,935 Mortgage loans held for sale — 4,148 — 4,148 Mortgage IRLCs — 94 — 94 Liabilities Fair value swap $ — $ — $ 226 $ 226 There were no transfers between Level 1 and Level 2 during 2018 or 2017 . 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 (Level 1). If quoted market prices are not available, fair values are based on quoted market prices of comparable instruments (Level 2). For securities where quoted prices or market prices of similar securities are not available, fair values are calculated using discounted cash flows (Level 3). 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): Mortgage 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, 2018 and 2017 , 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, 2018 $ 417 $ (226 ) Total Gains (Losses) Included in other income 7 — Balance at December 31, 2018 $ 424 $ (226 ) Balance at January 1, 2017 $ 790 $ (226 ) Total Gains (Losses) Included in other comprehensive income 6 — Transfers out of Level 3 (1) (346 ) — Purchases, sales, issuances and settlements, other, net (33 ) — Balance at December 31, 2017 $ 417 $ (226 ) (1) Transferred from Level 3 to Level 1 as the result of a quoted market price becoming available. 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. Collateral dependent 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 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. Collateral is then adjusted or discounted based on management’s historical knowledge, changes in market conditions from the time of the valuation, and management’s expertise and knowledge of the client and client’s business, resulting in a Level 3 fair value classification. Impaired loans are evaluated on a quarterly basis for additional impairment and adjusted accordingly. Additionally, updated independent valuations are obtained annually for all impaired loans in accordance with Company policy. 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 received by the Company: real estate appraisals, income approach appraisals, and lot development loan appraisals. 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. Other repossessed assets: Other repossessed assets are initially recorded at fair value less costs to sell when acquired. The carrying value of other repossessed assets 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. As of December 31, 2018 , other repossessed assets largely consisted of aircraft acquired as part of a loan workout. Fair value is based on Aircraft Bluebook and VREF Aircraft Value Reference values based on the model of aircraft and adjustments for flight hours, features and other variables. Such adjustments result in a Level 3 classification of the inputs for determining fair value. As of December 31, 2017, other repossessed assets largely consisted of lease receivables acquired as part of a loan workout. These receivables were initially recorded at fair value less costs to sell establishing a new cost basis and were not recorded as fair value as of December 31, 2017. 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. As of December 31, 2018 , there were no PCI loans carried at fair value. 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, 2018 Using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2018 Impaired loans recorded at fair value: Commercial real estate $ — $ — $ 4,059 $ 4,059 Construction real estate — — 1,635 1,635 Residential real estate — — 705 705 Total impaired loans recorded at fair value $ — $ — $ 6,399 $ 6,399 Mortgage servicing rights $ — $ 1,169 $ — $ 1,169 OREO recorded at fair value: Commercial real estate — — 2,295 2,295 Construction real estate — — 729 729 Residential real estate — — 650 650 Total OREO recorded at fair value $ — $ — $ 3,674 $ 3,674 Other repossessed assets $ — $ — $ 3,464 $ 3,464 Fair Value Measurements at December 31, 2017 Using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2017 Impaired loans recorded at fair value: Commercial real estate $ — $ — $ 2,735 $ 2,735 Construction real estate — — 127 127 Residential real estate — — 712 712 Total impaired loans recorded at fair value $ — $ — $ 3,574 $ 3,574 MSRs $ — $ 7,316 $ — $ 7,316 OREO recorded at fair value: Commercial real estate — — 2,295 2,295 Construction real estate — — 3,204 3,204 Residential real estate — — 1,021 1,021 Total OREO recorded at fair value $ — $ — $ 6,520 $ 6,520 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, 2018 (In thousands) Recorded Investment Prior Charge-Offs Specific Valuation Allowance Carrying Balance Impaired loans recorded at fair value $ 6,503 $ 3,630 $ 104 $ 6,399 Remaining impaired loans 41,641 7,616 2,169 39,472 Total impaired loans $ 48,144 $ 11,246 $ 2,273 $ 45,871 December 31, 2017 (In thousands) Recorded Investment Prior Charge-Offs Specific Valuation Allowance Carrying Balance Impaired loans recorded at fair value $ 3,577 $ 2,780 $ 3 $ 3,574 Remaining impaired loans 52,987 7,260 681 52,306 Total impaired loans $ 56,564 $ 10,040 $ 684 $ 55,880 The (expense) income from credit adjustments related to impaired loans carried at fair value for the years ended December 31, 2018 , 2017 and 2016 was $(0.4) million , $(1.6) million , and $0.9 million , respectively. MSRs totaled $10.2 million at December 31, 2018 . Of this $10.2 million MSR carrying balance, $1.2 million was recorded at fair value and included a valuation allowance of $0.2 million . The remaining $9.0 million was recorded at cost, as the fair value exceeded cost at December 31, 2018 . At December 31, 2017 , MSRs totaled $9.7 million . Of this $9.7 million MSR carrying balance, $7.3 million was recorded at fair value and included a valuation allowance of $0.6 million . T he remaining $2.4 million was recorded at cost, as the fair value exceeded cost at December 31, 2017 . The income (expense) related to MSRs carried at fair value for the years ended December 31, 2018 , 2017 and 2016 was $0.4 million , $0.1 million and $(0.2) million , respectively. Total OREO held by Park at December 31, 2018 and 2017 was $4.3 million and $14.2 million , respectively. Approximately 85% and 46% of OREO held by Park at December 31, 2018 and 2017 , respectively, was carried at fair value due to fair value adjustments made subsequent to the initial OREO measurement. At December 31, 2018 and 2017 , OREO held at fair value, less estimated selling costs, amounted to $3.7 million and $6.5 million , respectively. The net expense related to OREO fair value adjustments was $0.5 million , $0.5 million and $0.6 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. Other repossessed assets totaled $4.0 million at December 31, 2018 , of which $3.5 million were recorded at fair value. Other repossessed asset totaled $5.5 million at December 31, 2017, none of which were recorded at fair value. The net expense related to other repossessed asset fair value adjustments was $269,000 for the year ended December 31, 2018 . There was no expense related to fair value adjustments on other repossessed assets during either 2017 or 2016 . 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, 2018 and December 31, 2017 : December 31, 2018 (In thousands) Fair Value Valuation Technique Unobservable Input(s) Range (Weighted Average) Impaired loans: Commercial real estate $ 4,059 Sales comparison approach Adj to comparables 0.0% - 107.5% (31.1%) Income approach Capitalization rate 9.5% - 10.8% (10.6%) Cost approach Accumulated depreciation 4.2% - 90.1% (11.0%) Construction real estate $ 1,635 Sales comparison approach Adj to comparables 5.0% - 90.0% (26.1%) Residential real estate $ 705 Sales comparison approach Adj to comparables 0.0% - 40.0% (13.2%) Income approach Capitalization rate 10.5% (10.5%) Other real estate owned: Commercial real estate $ 2,295 Sales comparison approach Adj to comparables 0.9% - 68.4% (34.7%) Income approach Capitalization rate 13.0% (13.0%) Construction real estate $ 729 Sales comparison approach Adj to comparables 0.0% - 45.0% (21.7%) Residential real estate $ 650 Sales comparison approach Adj to comparables 30.4% - 54.6% (42.5%) December 31, 2017 (In thousands) Fair Value Valuation Technique Unobservable Input(s) Range (Weighted Average) Impaired loans: Commercial real estate $ 2,735 Sales comparison approach Adj to comparables 0.0% - 90.0% (22.7%) Income approach Capitalization rate 9.0% - 11.0% (9.9%) Cost approach Accumulated depreciation 90.1% (90.1%) Construction real estate $ 127 Sales comparison approach Adj to comparables 0.0% - 4.8% (2.4%) Residential real estate $ 712 Sales comparison approach Adj to comparables 0.3% - 33.0% (12.5%) Income approach Capitalization rate 10.5% (10.5%) Other real estate owned: Commercial real estate $ 2,295 Sales comparison approach Adj to comparables 0.9% - 68.4% (34.7%) Income approach Capitalization rate 13.0% (13.0%) Construction real estate $ 3,204 Sales comparison approach Adj to comparables 0.0% - 90.0% (24.5%) Bulk sale approach Discount rate 15.0% (15.0%) Residential real estate $ 1,021 Sales comparison approach Adj to comparables 1.2% - 79.7% (31.8%) Assets Measured at Net Asset Value: The adoption of ASU 2016-01 on January 1, 2018 required Park to evaluate the accounting for equity investments, including those previously held at cost. Under the new guidance, Park determined that its portfolio of equity investments in limited partnerships which provide mezzanine funding ("Partnership Investments") should be valued using the net asset value ("NAV") practical expedient in accordance with ASC 820. The adoption of this guidance on January 1, 2018, resulted in a $1.2 million increase to Partnership Investments, which are included within other assets on the Consolidated Balance Sheets, and a $922,000 increase to beginning retained earnings. As of December 31, 2018 and December 31, 2017, Park had Partnerships Investments with a NAV of $11.0 million and $8.8 million , respectively. As of December 31, 2018 and December 31, 2017, Park had $6.1 million and $7.2 million in unfunded commitments related to these Partnership Investments. For the year ended December 31, 2018 , Park had recognized $1.4 million in income related to these Partnership Investments. The fair value of financial instruments at December 31, 2018 and December 31, 2017 , was as follows: December 31, 2018 Fair Value Measurements (In thousands) Carrying value Level 1 Level 2 Level 3 Total fair value Financial assets: Cash and money market instruments $ 167,214 $ 167,214 $ — $ — $ 167,214 Investment securities (1) 1,355,229 — 1,354,843 — 1,354,843 Other investment securities (2) 1,649 1,225 — 424 1,649 Mortgage loans held for sale 4,158 — 4,158 — 4,158 Mortgage IRLCs 87 — 87 — 87 Impaired loans carried at fair value 6,399 — — 6,399 6,399 Other loans, net (3) 5,629,976 — — 5,570,136 5,570,136 Loans receivable, net $ 5,640,620 $ — $ 4,245 $ 5,576,535 $ 5,580,780 Financial liabilities: Time deposits 1,043,177 — 1,044,620 — 1,044,620 Other 1,267 1,267 — — 1,267 Total deposits $ 1,044,444 $ 1,267 $ 1,044,620 $ — $ 1,045,887 Short-term borrowings $ 221,966 $ — $ 221,966 $ — $ 221,966 Long-term debt 400,000 — 400,203 — 400,203 Subordinated notes 15,000 — 12,959 — 12,959 Derivative financial instruments: Fair value swap $ 226 $ — $ — $ 226 $ 226 (1) Includes AFS debt securities and HTM debt securities. (2) Excludes FHLB stock and FRB stock which are carried at their respective redemption values. Additionally, excludes investment securities accounted for at modified cost, as these investment securities do not have a readily determinable fair value. (3) Fair value calculated using an exit price notion consistent with Topic 820, Fair Value Measurement. December 31, 2017 Fair Value Measurements (In thousands) Carrying value Level 1 Level 2 Level 3 Total fair value Financial assets: Cash and money market instruments $ 169,112 $ 169,112 $ — $ — $ 169,112 Investment securities (1) 1,449,078 — 1,455,660 — 1,455,660 Other investment securities (2) 1,935 1,518 — 417 1,935 Loans held for sale 4,148 — 4,148 — 4,148 Mortgage IRLCs 94 — 94 — 94 Impaired loans carried at fair value 3,574 — — 3,574 3,574 Other loans, net 5,314,679 — — 5,247,021 5,247,021 Loans receivable, net $ 5,322,495 $ — $ 4,242 $ 5,250,595 $ 5,254,837 Financial liabilities: Time deposits 1,033,476 — 1,035,093 — 1,035,093 Other 1,269 1,269 — — 1,269 Total deposits $ 1,034,745 $ 1,269 $ 1,035,093 $ — $ 1,036,362 Short-term borrowings $ 391,289 $ — $ 391,289 $ — $ 391,289 Long-term debt 500,000 — 504,503 — 504,503 Subordinated notes 15,000 — 13,370 — 13,370 Derivative financial instruments: Fair value swap $ 226 $ — $ — $ 226 $ 226 (1) Includes AFS debt securities and HTM debt securities. (2) Excludes FHLB stock and FRB stock which are carried at their respective redemption values. Additionally, excludes investment securities accounted for at modified cost, as these investment securities do not have a readily determinable fair value.

Capital Ratios

Capital Ratios	12 Months Ended
	Dec. 31, 2018
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 under the prompt corrective action regulations applicable to PNB. Additionally, under this framework, in order to avoid limitations on capital distributions, including dividend payments and stock repurchases, Park must hold a capital conservation buffer above the adequately capitalized risk-based capital ratios. The capital conservation buffer began to phase in starting on January 1, 2016 at 0.625% and effective January 1, 2019, was fully phased in at 2.50% . The capital conservation buffer was 1.875% for 2018 and 1.25% for 2017. The amounts shown below as the adequately capitalized ratio plus capital conservation buffer includes the fully phased-in 2.50% buffer. The Federal Reserve Board also adopted requirements Park must maintain to be deemed "well-capitalized" and to remain a financial holding company. Each of PNB and Park met each of the well-capitalized ratio guidelines applicable to it at December 31, 2018. The following table indicates the capital ratios for PNB and Park at December 31, 2018 and 2017. As of December 31, 2018 Leverage Tier 1 Risk-Based Common Equity Tier 1 Total Risk-Based PNB 8.29 % 11.01 % 11.01 % 12.30 % Park 10.04 % 13.30 % 13.04 % 14.19 % 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 5.00 % 8.00 % 6.50 % 10.00 % Well-capitalized ratio - Park N/A 6.00 % N/A 10.00 % As of December 31, 2017 Leverage Tier 1 Risk-Based Common Equity Tier 1 Total Risk-Based PNB 7.36 % 10.35 % 10.35 % 11.60 % Park 9.44 % 13.22 % 12.94 % 14.14 % 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 5.00 % 8.00 % 6.50 % 10.00 % Well-capitalized ratio - Park N/A 6.00 % N/A 10.00 % 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, 2018 Total Risk-Based Capital PNB $ 709,101 12.30 % $ 461,293 8.00 % $ 576,617 10.00 % Park 826,006 14.19 % 465,732 8.00 % 582,166 10.00 % Tier 1 Risk-Based Capital PNB $ 634,909 11.01 % $ 345,970 6.00 % $ 461,293 8.00 % Park 774,369 13.30 % 349,299 6.00 % 349,299 6.00 % Leverage Ratio PNB $ 634,909 8.29 % $ 306,485 4.00 % $ 383,106 5.00 % Park 774,369 10.04 % 308,397 4.00 % N/A N/A Common Equity Tier 1 PNB $ 634,909 11.01 % $ 259,478 4.50 % $ 374,801 6.50 % Park 759,369 13.04 % 261,975 4.50 % N/A N/A At December 31, 2017 Total Risk-Based Capital PNB $ 628,440 11.60 % $ 433,406 8.00 % $ 541,757 10.00 % Park 775,867 14.14 % 438,981 8.00 % 548,726 10.00 % Tier 1 Risk-Based Capital PNB $ 560,530 10.35 % $ 325,054 6.00 % $ 433,406 8.00 % Park 725,221 13.22 % 329,235 6.00 % 329,235 6.00 % Leverage Ratio PNB $ 560,530 7.36 % $ 304,722 4.00 % $ 380,903 5.00 % Park 725,221 9.44 % 307,441 4.00 % N/A N/A Common Equity Tier 1 PNB 560,530 10.35 % 243,791 4.50 % 352,142 6.50 % Park 710,221 12.94 % 246,927 4.50 % N/A N/A

Segment Information

Segment Information	12 Months Ended
	Dec. 31, 2018
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 PNB, 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, 2018 (In thousands) PNB GFSC SEPH All Other Total Net interest income $ 258,547 $ 5,048 $ 2,611 $ 692 $ 266,898 Provision for (recovery of) loan losses 7,569 1,328 (952 ) — 7,945 Other income 88,981 187 5,900 6,033 101,101 Other expense 206,843 3,245 4,049 14,618 228,755 Income (loss) before income taxes 133,116 662 5,414 (7,893 ) 131,299 Income tax expense (benefit) 23,644 141 1,137 (4,010 ) 20,912 Net income (loss) $ 109,472 $ 521 $ 4,277 $ (3,883 ) $ 110,387 Balances at December 31, 2018 Assets $ 7,753,848 $ 31,388 $ 8,428 $ 10,644 $ 7,804,308 Loans 5,671,173 32,664 1,636 (13,341 ) 5,692,132 Deposits 6,334,796 4,142 — (78,078 ) 6,260,860 Operating results for the year ended December 31, 2017 (In thousands) PNB GFSC SEPH All Other Total Net interest income $ 235,243 $ 5,839 $ 2,089 $ 588 $ 243,759 Provision for (recovery of) loan losses 9,898 1,917 (3,258 ) — 8,557 Other income 82,742 103 519 3,065 86,429 Other expense 185,891 3,099 5,367 8,805 203,162 Income (loss) before income taxes 122,196 926 499 (5,152 ) 118,469 Income tax expense (benefit) 34,881 666 1,375 (2,695 ) 34,227 Net income (loss) $ 87,315 $ 260 $ (876 ) $ (2,457 ) $ 84,242 Balances at December 31, 2017 Assets $ 7,467,851 $ 32,077 $ 24,902 $ 12,790 $ 7,537,620 Loans 5,339,255 33,385 10,891 (11,048 ) 5,372,483 Deposits 5,896,676 3,449 — (82,799 ) 5,817,326 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 79,959 57 3,068 955 84,039 Other expense 182,718 4,515 7,367 9,731 204,331 Income (loss) before income taxes 122,206 (471 ) 10,074 (8,914 ) 122,895 Income tax expense (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 The following is a reconciliation of financial information for the reportable segments to the Corporation’s consolidated totals: 2018 (In thousands) Net Interest Income Depreciation Expense Other Expense Income Taxes Assets Deposits Totals for reportable segments $ 266,206 $ 8,585 $ 205,552 $ 24,922 $ 7,793,664 $ 6,338,938 Elimination of intersegment items 1,275 — — — (16,521 ) (78,078 ) Parent Co. totals - not eliminated (583 ) — 14,618 (4,010 ) 27,165 — Totals $ 266,898 $ 8,585 $ 220,170 $ 20,912 $ 7,804,308 $ 6,260,860 2017 (In thousands) Net Interest Income Depreciation Expense Other Expense Income Taxes Assets Deposits Totals for reportable segments $ 243,171 $ 8,644 $ 185,713 $ 36,922 $ 7,524,830 $ 5,900,125 Elimination of intersegment items 1,500 — — — (14,679 ) (82,799 ) Parent Co. totals - not eliminated (912 ) — 8,805 (2,695 ) 27,469 — Totals $ 243,759 $ 8,644 $ 194,518 $ 34,227 $ 7,537,620 $ 5,817,326 2016 (In thousands) Net Interest Income Depreciation Expense Other Expense Income Taxes Assets Deposits Totals for reportable segments $ 238,224 $ 8,396 $ 186,204 $ 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 $ 195,935 $ 36,760 $ 7,467,586 $ 5,521,956

Parent Company Statements

Parent Company Statements	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information 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 $3.9 million , $3.3 million and $4.4 million in 2018 , 2017 and 2016 , respectively. Condensed Balance Sheets December 31, 2018 and 2017 (In thousands) 2018 2017 Assets: Cash $ 75,094 $ 79,452 Investment in subsidiaries 727,773 645,287 Debentures receivable from PNB 25,000 25,000 Other investments 1,165 1,398 Other assets 25,972 26,838 Total assets $ 855,004 $ 777,975 Liabilities: Subordinated notes 15,000 15,000 Other liabilities 7,498 6,874 Total liabilities 22,498 21,874 Total shareholders’ equity 832,506 756,101 Total liabilities and shareholders’ equity $ 855,004 $ 777,975 Condensed Statements of Income for the years ended December 31, 2018, 2017 and 2016 (In thousands) 2018 2017 2016 Income: Dividends from subsidiaries $ 100,000 $ 60,000 $ 60,000 Interest and dividends 1,275 1,500 2,164 Gain on sale of investment securities — 1,821 — Other 6,068 1,405 1,081 Total income 107,343 64,726 63,245 Expense: Interest expense 617 1,073 2,429 Other, net 14,619 8,805 9,730 Total expense 15,236 9,878 12,159 Income before income taxes and equity in undistributed income of subsidiaries 92,107 54,848 51,086 Income tax benefit 4,010 2,695 4,357 Income before equity in undistributed income of subsidiaries 96,117 57,543 55,443 Equity in undistributed income of subsidiaries 14,270 26,699 30,692 Net income $ 110,387 $ 84,242 $ 86,135 Other comprehensive loss (1) (18,533 ) (8,709 ) (2,102 ) Comprehensive income $ 91,854 $ 75,533 $ 84,033 (1) See Consolidated Statements of Comprehensive Income for other comprehensive loss detail. Statements of Cash Flows for the years ended December 31, 2018, 2017 and 2016 (In thousands) 2018 2017 2016 Operating activities: Net income $ 110,387 $ 84,242 $ 86,135 Adjustments to reconcile net income to net cash provided by operating activities: Undistributed income of subsidiaries (14,270 ) (26,699 ) (30,692 ) Compensation expense for issuance of treasury shares to directors 1,109 1,241 950 Share-based compensation expense 3,954 2,701 1,864 Realized net investment security gains — (1,821 ) — Gain on equity securities, net (3,267 ) — — (Increase) decrease in other assets (2,073 ) 205 (3,425 ) (Decrease) increase in other liabilities (163 ) 475 (2,524 ) Net cash provided by operating activities 95,677 60,344 52,308 Investing activities: Proceeds from sales of securities — 2,265 — Outlays for business acquisitions (30,684 ) — — Repayment of investments in and advances to subsidiaries — — 15,000 Other, net 60 — — Net cash (used in) provided by investing activities (30,624 ) 2,265 15,000 Financing activities: Cash dividends paid (63,013 ) (57,493 ) (57,653 ) Repayment of subordinated notes — (30,000 ) — Repurchase of treasury shares (5,784 ) (7,378 ) — Cash payment for fractional shares (4 ) (6 ) (4 ) Value of common shares withheld to pay employee income taxes (610 ) (347 ) — Net cash used in financing activities (69,411 ) (95,224 ) (57,657 ) (Decrease) increase in cash (4,358 ) (32,615 ) 9,651 Cash at beginning of year 79,452 112,067 102,416 Cash at end of year $ 75,094 $ 79,452 $ 112,067

Revenue from Contracts with Cus

Revenue from Contracts with Customers	12 Months Ended
	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Text Block]	Revenue from Contracts with Customers The Company adopted ASC 606 using the modified retrospective method applied to all contracts not completed as of January 1, 2018. Results for reporting periods beginning on and after January 1, 2018 are presented under ASC 606 while prior period amounts continue to be reported in accordance with legacy GAAP. The adoption of ASC 606 did not result in a change to the accounting for any of the in-scope revenue streams; as such, no cumulative effect adjustment was recorded. All of Park's revenue from contracts with customers within the scope of ASC 606 is recognized within "Other income" in the Consolidated Statements of Income. The following table presents Park's sources of other income by revenue stream and operating segment for the years ended December 31, 2018 , December 31, 2017 and December 31, 2016 . Year Ended Revenue by Operating Segment (in thousands) PNB GFSC SEPH All Other Total Income from fiduciary activities Personal trust and agency accounts $ 8,495 $ — $ — $ — $ 8,495 Employee benefit and retirement-related accounts 6,863 — — — 6,863 Investment management and investment advisory agency accounts 9,352 — — — 9,352 Other 1,583 — — — 1,583 Service charges on deposit accounts Non-sufficient funds (NSF) fees 7,483 — — — 7,483 Demand deposit account (DDA) charges 3,310 — — — 3,310 Other 668 — — — 668 Other service income (1) Credit card 2,212 27 — — 2,239 HELOC 471 — — — 471 Installment 243 — — — 243 Real estate 9,079 — — — 9,079 Commercial 1,153 — 1,081 — 2,234 Checkcard fee income 17,317 — — — 17,317 Bank owned life insurance income (2) 4,903 — — 1,912 6,815 ATM fees 1,978 — — — 1,978 OREO valuation adjustments (2) (272 ) — (219 ) — (491 ) Gain on the sale of OREO, net 1,440 — 2,795 — 4,235 Net loss on the sale of investment securities (2) (2,271 ) — — — (2,271 ) (Loss) gain on equity securities, net (2) (53 ) — — 3,266 3,213 Other components of net periodic pension benefit income (2) 6,609 75 136 — 6,820 Gain on the sale of non-performing loans (2) 660 — 2,166 — 2,826 Miscellaneous (3) 7,758 85 (59 ) 855 8,639 Total other income $ 88,981 $ 187 $ 5,900 $ 6,033 $ 101,101 (1) Of the $14.3 million of revenue included within "Other service income", approximately $5.5 million is within the scope of ASC 606, with the remaining $8.8 million consisting primarily of residential real estate loan fees which are out of scope. (2) Not within the scope of ASC 606. (3) "Miscellaneous" income includes brokerage income, safe deposit box rentals, and miscellaneous bank fees totaling $8.6 million , all of which are within the scope of ASC 606 . Year Ended December 31, 2017 (4) Revenue by Operating Segment (in thousands) PNB GFSC SEPH All Other Total Income from fiduciary activities Personal trust and agency accounts $ 7,752 $ — $ — $ — $ 7,752 Employee benefit and retirement-related accounts 6,234 — — — 6,234 Investment management and investment advisory agency accounts 8,386 — — — 8,386 Other 1,363 — — — 1,363 Service charges on deposit accounts Non-sufficient funds (NSF) fees 8,122 — — — 8,122 Demand deposit account (DDA) charges 3,847 — — — 3,847 Other 684 — — — 684 Other service income (1) Credit card 1,987 (6 ) — — 1,981 HELOC 474 — 4 — 478 Installment 387 — — — 387 Real estate 8,974 — 31 — 9,005 Commercial 1,118 — 193 — 1,311 Checkcard fee income 15,798 — — — 15,798 Bank owned life insurance income (2) 4,441 — — 417 4,858 ATM fees 2,253 — — — 2,253 OREO valuation adjustments (2) (458 ) — — — (458 ) Gain on the sale of OREO, net 239 — 12 — 251 Net gain on sale of investment securities (2) — — — 1,821 1,821 Other components of net periodic pension benefit income (2) 5,616 63 115 — 5,794 Miscellaneous (3) 5,525 46 164 827 6,562 Total other income $ 82,742 $ 103 $ 519 $ 3,065 $ 86,429 (1) Of the $13.2 million of revenue included within "Other service income", approximately $4.4 million is within the scope of ASC 606, with the remaining $8.8 million consisting primarily of residential real estate loan fees which are out of scope. (2) Not within the scope of ASC 606. (3) "Miscellaneous" income includes brokerage income, safe deposit box rentals, and miscellaneous bank fees totaling $6.6 million , all of which are within the scope of ASC 606. (4) The Corporation elected the modified retrospective approach of adoption; therefore, prior period balances are presented under legacy GAAP and may not be comparable to current year presentation. Year Ended December 31, 2016 (4) Revenue by Operating Segment (in thousands) PNB GFSC SEPH All Other Total Income from fiduciary activities Personal trust and agency accounts 7,101 — — — $ 7,101 Employee benefit and retirement-related accounts 5,432 — — — 5,432 Investment management and investment advisory agency accounts 7,693 — — — 7,693 Other 1,174 — — — 1,174 Service charges on deposit accounts Non-sufficient funds (NSF) fees 8,970 — — — 8,970 Demand deposit account (DDA) charges 3,932 — — — 3,932 Other 1,357 — — — 1,357 Other service income (1) Credit card 1,584 — — — 1,584 HELOC 453 — 5 — 458 Installment 638 — — — 638 Real estate 9,319 — — — 9,319 Commercial 739 — 1,681 — 2,420 Checkcard fee income 15,057 — — — 15,057 Bank owned life insurance income (2) 3,913 — — 425 4,338 ATM fees 2,268 — — — 2,268 OREO valuation adjustments (2) (583 ) — (18 ) — (601 ) Gain on the sale of OREO, net 257 — 1,066 — 1,323 Other components of net periodic pension benefit income (2) 5,156 58 94 — 5,308 Miscellaneous (3) 5,499 (1 ) 240 530 6,268 Total other income $ 79,959 $ 57 $ 3,068 $ 955 $ 84,039 (1) Of the $14.4 million of revenue included within "Other service income", approximately $5.4 million is within the scope of ASC 606, with the remaining $9.0 million consisting primarily of residential real estate loan fees which are out of scope. (2) Not within the scope of ASC 606. (3) "Miscellaneous" income includes brokerage income, safe deposit box rentals, and miscellaneous bank fees totaling $6.3 million , all of which are within the scope of ASC 606. (4) The Corporation elected the modified retrospective approach of adoption; therefore, prior period balances are presented under legacy GAAP and may not be comparable to current year presentation. A description of Park's material revenue streams accounted for under ASC 606 follows: Income from fiduciary activities (Gross) : Park earns fiduciary fee income and investment brokerage fees from its contracts with trust customers for various fiduciary and investment-related services. These fees are earned over time as the Company provides the contracted monthly and quarterly services and are generally assessed based on the market value of the trust assets. Service charges on deposit accounts and ATM fees : The Corporation earns fees from its deposit customers for transaction-based, account maintenance, and overdraft services. Transaction-based fees, which include services such as ATM use fees, stop payment charges, statement rendering, and ACH fees, are recognized at the time the transaction is executed as that is the point in time the Corporation fulfills the customer's request. Account maintenance fees, which relate primarily to monthly maintenance, are generally recognized at the end of the month, representing the period over which the Corporation satisfies the performance obligation. Overdraft fees are recognized at the point in time that the overdraft occurs. Service charges on deposits are withdrawn from the customer's account balance. Other service income : Other service income includes income from 1) the sale and servicing of loans sold to the secondary market, 2) incentive income from third-party credit card issuers, and 3) loan customers for various loan-related activities and services. These fees are generally recognized at a point in time following the completion of a loan sale or related service activity. Checkcard fee income : Park earns interchange fees from checkcard cardholder transactions conducted primarily through the Visa payment network. Interchange fees from cardholder transactions represent a percentage of the underlying transaction value and are recognized daily, net of card network fees, concurrently with the transaction processing services provided to the cardholder. Gain on sale of OREO, net : The Corporation records a gain or loss from the sale of OREO when control of the property transfers to the buyer, which generally occurs at the time of delivery of an executed deed. When Park finances the sale of OREO to the buyer, the Corporation assesses whether the buyer is committed to perform the buyer's obligation under the contract and whether collectability of the transaction price is probable. Once these criteria are met, the OREO asset is derecognized and the gain or loss on sale is recorded upon the transfer of control of the property to the buyer. In determining the gain or loss on the sale, the Corporation adjusts the transaction price and related gain (loss) on sale if a significant financing component is present.

Subsequent Event Business Combi

Subsequent Event Business Combinations	12 Months Ended
	Dec. 31, 2018
Business Acquisition [Line Items]
Schedule of Business Acquisitions by Acquisition, Contingent Consideration [Table Text Block]	Subsequent Events On September 12, 2018, Park and CAB Financial Corporation, a South Carolina corporation (“CABF”), entered into an Agreement and Plan of Merger and Reorganization (the “CABF Merger Agreement”), pursuant to which CABF will merge with and into Park (the “CABF Merger”). Following the CABF Merger, CABF’s wholly-owned bank subsidiary, Carolina Alliance Bank, will merge with and into PNB, with PNB as the surviving bank. Subject to the terms and conditions of the CABF Merger Agreement, at the effective time of the CABF Merger (the “CABF Effective Time”), CABF shareholders will receive, for each share of CABF’s common stock, $1.00 par value per share, (i) $3.80 in cash and (ii) 0.1378 of Park's common shares (the “CABF Merger Consideration”). At the CABF Effective Time, CABF stock options with an exercise price of less than $19.00 will be canceled and converted into the right to receive the CABF Merger Consideration. CABF stock options with an exercise price of $19.00 or more will be assumed and converted into an option to purchase Park common shares, on the same terms and conditions as were applicable under such CABF stock option. At the CABF Effective Time, CABF restricted stock awards will fully vest (with any performance-based vesting condition deemed satisfied) and will be canceled and converted automatically into the right to receive CABF Merger Consideration. On January 14, 2019, the shareholders of CABF voted in favor of approving the CABF Merger. The CABF Merger is expected to close early in the second quarter of 2019.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
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”), unless the context otherwise requires. Material intercompany accounts and transactions have been eliminated.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America ("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. Additionally, prior period financial statements reflect the retrospective application of Accounting Standards Update ("ASU") 2017-07 - Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. 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, The Park National Bank ("PNB"), is required to maintain average reserve balances with the Federal Reserve Bank of Cleveland. The average required reserve balance was approximately $73.9 million at December 31, 2018 and $64.8 million at December 31, 2017 . No other compensating balance arrangements were in existence at December 31, 2018 .
Investment Securities	Investment Securities Debt securities are classified upon acquisition into one of three categories: held-to-maturity ("HTM"), available-for-sale ("AFS"), or trading (see Note 5 - Investment Securities). HTM securities are those debt securities that the Corporation has the positive intent and ability to hold to maturity and are recorded at amortized cost. AFS securities are those debt 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. Equity securities are carried at fair value, with changes in fair value reported in net income. Equity securities without readily determinable fair values are carried at cost, minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment. Debt 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 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. The credit loss is defined as the difference between the present value of the cash flows expected to be collected and the amortized costs basis. 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 method.
Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) Stock	Federal Home Loan Bank ("FHLB") and Federal Reserve Bank of Cleveland ("FRB") Stock PNB is a member of the FHLB and 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 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 value of the interest rate lock is recorded at the time the commitment to fund the mortgage loan is executed and is adjusted for the expected exercise of the commitment before the loan is funded. In order to hedge the change in interest rates resulting from its commitments to fund the loans, the Company enters into forward commitments for the future delivery of mortgage loans when interest rate locks are entered into. Fair value of these mortgage derivatives is estimated based on the change in mortgage interest rates from the date the interest on the loan is locked. Changes in the fair values of these derivatives are included in "Other service income" in the Consolidated Statements of Income.
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 nonaccrual interest payments applied to principal, 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. Late charges on loans are recognized as income when they are collected. Net 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. The delinquency status of a loan is based on contractual terms and not on how recently payments have been received. Commercial loans placed on nonaccrual status are considered impaired (see Note 6 - Loans). Park’s charge-off policy for commercial loans requires management to establish a specific reserve or record a charge-off when collection is in doubt or it is probable a loss has been incurred 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. 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. 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 ("C&I") loans are made for a wide variety of general corporate purposes, including financing for commercial and industrial properties, financing for equipment, inventory and accounts receivable, acquisition financing, commercial leasing, and to consumer finance companies. 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. Risk of loss on C&I loans largely depends upon general economic cycles, as they may adversely impact certain industries, competency of the borrower's management team, the quality of the underlying assets supporting the loans including accounts receivable, inventory, and equipment, and the accuracy of the borrower's financial reporting. Such risks are mitigated by generally requiring the borrower's owners to guaranty the loans. 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. Risk of loss on CRE loans largely depends upon the cash flow of the properties which is influenced by the amount of vacancy experienced by the underlying real estate, the credit capacity of the tenants occupying the underlying real estate, and general economic trends as they may adversely impact the value of the property. These risks are mitigated by generally requiring personal guaranties of the owners of the properties and by requiring appraisals pursuant to government regulations. 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 a 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 a current independent third-party appraisal providing the market value of the real estate securing the loan. Residential real estate loans typically have longer terms and higher balances with lower yields as compared to consumer loans, but generally carry lower risks of default. The Dodd-Frank Wall Street Reform and Consumer Protection Act requires creditors to make a reasonable and good faith determination of a consumer's ability to repay any consumer credit transaction secured by a dwelling. Documentation and verification of income within defined time frames and not-to-exceed limits are basis for affirming ability to repay. Risk of loss largely depends upon factors affecting the borrower's ability to repay as well as the general economic trends as they may adversely impact the value of the property. These risks are mitigated by completing a comprehensive underwriting of the borrower and by requiring appraisals pursuant to government regulations. 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.
Concentration Risk, Credit Risk, Policy [Policy Text Block]	Concentration of Credit Risk Park's commercial loan portfolio includes loans to a wide variety of corporations and businesses across many industrial classifications in the 29 Ohio counties, 2 North Carolina counties and 1 Kentucky county where PNB and its divisions operate, with the exception of nationwide aircraft loans and nationwide asset-based lending to consumer finance companies. The primary industries represented by these customers include real estate rental and leasing, finance and insurance, construction, agriculture, forestry, fishing and hunting, manufacturing, retail trade, health care, accommodation and food services and other services.
Certain Loans and Debt Securities Acquired in Transfer, Recognizing Interest Income on Impaired Loans, Policy [Policy Text Block]	Purchased Credit Impaired (“PCI”) Loans The Company has purchased loans, some of which have shown evidence of credit deterioration since origination. These PCI loans are recorded at fair value, such that there is no carryover of the sellers' allowance for loan losses. After acquisition, losses are recognized by an increase in the allowance for loan losses. Such PCI loans are accounted for individually. The Company estimates the amount and timing of expected cash flows for each loan and the expected cash flows in excess of the amount paid is recorded as interest income over the remaining life of the loan (accretable yield). The excess of the loan’s contractual principal and interest over expected cash flows is not recorded (nonaccretable difference). Over the life of the loan, expected cash flows continue to be estimated. If the present value of expected cash flows is less than the carrying amount, a loss is recorded as a provision for loan losses. If the present value of expected cash flows is greater than the carrying amount, it is recognized as part of future interest income.
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, 2018 , 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 2018 within the individual segments of the commercial and consumer loan categories. The 108 -month historical loss period captures all annual periods subsequent to June 2009, the end of the most recent recession, thus encompassing the full economic cycle to date. The loss factor applied to Park’s consumer loan portfolio as of December 31, 2018 was based on the historical loss experience over the preceding 108 months, plus an additional judgmental reserve, increasing the total allowance for loan loss coverage in the consumer loan portfolio to approximately 1.87 years of historical losses, compared to 1.92 years at December 31, 2017 . Historical loss experience over the preceding 108 months for the consumer loan portfolio was 0.33% for 2018. Historical loss experience over the preceding 96 months for the consumer loan portfolio was 0.34% for 2017. The loss factor applied to Park’s commercial loan portfolio as of December 31, 2018 was based on the historical loss experience over the preceding 108 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 3.39 years of historical losses at December 31, 2018, compared to 3.24 years at December 31, 2017 . Historical loss experience over the preceding 108 months for the commercial loan portfolio was 0.35% for 2018. Historical loss experience over the preceding 96 months for the commercial loan portfolio was 0.37% for 2017. 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 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. Loans acquired as part of the acquisition of NewDominion Bank were recorded at fair value on the date of acquisition, July 1, 2018. An allowance is only established on these NewDominion Bank loans as a result of credit deterioration post acquisition. As of December 31, 2018, there was no allowance related to acquired NewDominion Bank loans.
Troubled Debt Restructuring (TDRs)	Troubled Debt Restructurings 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 measured at the present value of estimated future cash flows using the loan’s effective rate at inception, or if a TDR is considered to be a collateral dependent loan, the loan is reported, net, at the fair value of the collateral. Commercial TDRs are separately identified for impairment disclosures.
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 16 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 to 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".
Finance, Loan and Lease Receivables, Held for Investments, Foreclosed Assets Policy [Policy Text Block]	Foreclosed Assets Foreclosed assets include non-real estate assets where Park, as creditor, has received physical possession of a borrower’s assets, regardless of whether formal foreclosure proceedings take place. Additionally, TDRs in which Park obtains one of more of the debtor’s non-real estate assets in place of all or part of the receivable are accounted for as foreclosed assets. Foreclosed assets are initially recorded as fair value less costs to sell when acquired, establishing a new cost basis. Operating costs after acquisition are expensed. As of December 31, 2018 and 2017, Park had $4.0 million and $5.5 million , respectively, of foreclosed assets included within “Other assets.”
Mortgage Loan Servicing Rights	Mortgage Servicing Rights ("MSRs") When Park sells mortgage loans with MSRs retained, MSRs are recorded at fair value with the income statement effect recorded in "Other service income." Capitalized MSRs 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”. MSRs are assessed for impairment periodically, based on fair value, with any impairment recognized through a valuation allowance. The fair value of MSRs 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 25 - 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 amortization of MSRs is netted against loan servicing fee income, recorded in "Other service income".
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill represents the excess of the purchase price over net identifiable tangible and intangible assets acquired in a purchase business combination. Goodwill is not amortized to expense, but is 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 the performance of additional analysis 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, not to exceed the total goodwill allocated to the reporting unit. 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, 2018, the goodwill remaining on Park's Consolidated Balance Sheets consisted entirely of goodwill at PNB. (See Note 8 - Goodwill and Other Intangible Assets and Note 28 - 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, 2018, the Company determined that goodwill for PNB was not impaired. There have been no subsequent circumstances or events triggering an additional evaluation. Other intangible assets consist of core deposit intangibles and a trade name intangible. Core deposit intangibles are amortized on an accelerated basis over a period of ten years. The trade name intangible is an indefinite life assets and is not amortized but rather is assessed, at least annually, for impairment. Goodwill of $112.7 million and other intangible assets in the amount of $7.0 million were recorded at December 31, 2018 and $72.3 million of goodwill was recorded at each of December 31, 2017 and 2016. Goodwill and other intangible assets increased by an aggregate amount of $48.0 million as a result of the acquisition of NewDominion on July 1, 2018.
Consolidated Statement of Cash Flows	Consolidated Statements 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. Management does not believe there now are such matters that will have a material effect on the financial statements.
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.
Policyholders' Dividend [Policy Text Block]	Dividend Restriction Banking regulations require maintaining certain capital levels and may limit the dividends paid by a bank to its parent holding company or by the parent holding company to its shareholders. (See Note 23 - Dividend Restrictions and Note 27 - Capital Ratios.)
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 debt 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 on a straight-line basis over the required service period, generally defined as the vesting period and is recorded in "Salaries" expense. (See Note 18 - Share-Based Compensation.) The Company's accounting policy is to recognize forfeitures as they occur.
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 26 - 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. The service cost component of pension expense is recorded within "Employee benefits" on the Consolidated Statements of Income. All other components of pension expense are recorded within "Other components of net periodic benefit income" on the Consolidated Statements of Income. 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 19 - Benefit Plans.)
Earnings Per Common Share	Earnings Per Common Share Basic earnings per common share is net income 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 restricted stock unit awards. 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 18 - Share-Based Compensation and Note 22 - 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 Pr_2

Adoption of New Accounting Pronouncements (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Changes and Error Corrections [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]	Adoption of New Accounting Pronouncements and Issued But Not Yet Effective Accounting Standards The following is a summary of new accounting pronouncements impacting Park's consolidated financial statements, and issued but not yet effective accounting standards: Adoption of New Accounting Pronouncements ASU 2014-09 - Revenue from Contracts with Customers (Topic 606): In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). This 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. The majority of the Company's revenues come from interest income and other sources, including loans, leases, securities and derivatives, that are outside the scope of ASC 606. Certain services that fall within the scope of ASC 606 are presented within "Other income" and are recognized as revenue as the Company satisfies its obligation to the customer. Services within the scope of ASC 606 include income from fiduciary activities, service charges on deposit accounts, other service income, checkcard fee income, ATM fees, and gain on sale of OREO, net. The adoption of this guidance on January 1, 2018 did not have a material impact on Park's consolidated financial statements. However, the adoption of this standard resulted in additional disclosures beginning with the Quarterly Report on 2018 Form 10-Q for the quarterly period ended March 31, 2018. Reference Note 30 - Revenue from Contracts with Customers, for further discussion on the Company's accounting policies for revenue sources within the scope of ASC 606. 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 reflected in the current 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, this ASU clarifies guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on AFS 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 on January 1, 2018 resulted in a $1.9 million increase to beginning retained earnings and a $995,000 increase to beginning accumulated other comprehensive loss. Further, beginning with the first quarter of 2018, Park's fair value disclosures (see Note 26 - Fair Value), have incorporated the revised disclosure requirements for financial investments. 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 then current GAAP was either unclear or did 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. The adoption of this guidance on January 1, 2018 did not have an impact on Park's consolidated financial statements. As such transactions arise, management will utilize the updated guidance in providing disclosures within Park’s consolidated statements of cash flows. ASU 2017-07 - Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost: In March 2017, the FASB issued ASU 2017-07 - Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost. This ASU requires that an employer report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the income statement separately from the service cost component. The new guidance is effective for annual reporting periods, and interim reporting periods within those annual periods, beginning after December 15, 2017. As a result of the adoption of this guidance on January 1, 2018, all prior periods have been recast to separately record the service cost component and other components of net benefit cost. For all periods presented, this resulted in an increase in other income and an offsetting increase in other expense with no change to net income. See Note 19 - Benefit Plans, for further details. ASU 2017-09 - Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting: In May 2017, the FASB issued ASU 2017-09 - Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting. This ASU amends the guidance concerning which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting under Topic 718. 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 on January 1, 2018 did not impact Park's consolidated financial statements. ASU 2017-12 - Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities: In August 2017, the FASB issued ASU 2017-12 - Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. This ASU amends the current guidance with the objective of improving the financial reporting of hedging relationships to better portray the economic results of an entity's risk management activities in its financial statements. In addition, this ASU amends the current guidance to simplify the application of the hedge accounting guidance. 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 for interim or annual periods. The early adoption of this guidance on July 1, 2018 did not have an impact on Park's consolidated financial statements. Park will apply this guidance to future transactions. ASU 2018-02 - Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income : In February 2018, the FASB issued ASU 2018-02 - Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. This ASU allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects, resulting from the federal corporate income tax rate enacted under the Tax Cuts and Jobs Act. The amount of the reclassification is the difference between the historical federal corporate income tax rate and the newly-enacted 21% federal corporate income tax rate. The guidance is effective for annual reporting periods, and interim reporting periods within those annual periods, beginning after December 15, 2018. Early adoption is permitted for interim or annual periods. The early adoption of this guidance effective January 1, 2018 resulted in a $3.8 million increase to Park's accumulated other comprehensive loss and a $3.8 million increase to retained earnings. ASU 2018-03 - Technical Corrections and Improvements to Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. In February 2018, the FASB issued ASU 2018-03 - Technical Corrections and Improvements to Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. This ASU includes amendments that clarify certain aspects of the guidance issued in ASU 2016-01. Park considered this clarification in determining the appropriate adoption of ASU 2016-01 effective as of January 1, 2018. Issued But Not Yet Effective Accounting Standards ASU 2016-02 - Leases (Topic 842): In February 2016, the FASB issued ASU 2016-02 - Leases (Topic 842) . This 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. The adoption of this guidance on January 1, 2019 resulted in an approximate $11.1 million increase in assets and an approximate $11.0 million increase in liabilities, but is not expected to have a material impact on Park's Consolidated Statements of Income. 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 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 the CECL model and is currently in the process of evaluating segmentation and model selection. Management plans to run our current allowance model and a CECL model concurrently beginning with March 31, 2019 data. ASU 2017-08 - Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities: In March 2017, the FASB issued ASU 2017-08 - Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities. This ASU amends the amortization period for certain purchased callable debt securities held at a premium. It shortens the amortization period for the premium to the earliest call date. Under current GAAP, premiums on callable debt securities generally are amortized to the maturity date. The new guidance is effective for annual reporting periods, and interim reporting periods within those annual periods, beginning after December 15, 2018. The adoption of this guidance on January 1, 2019 did not have a material impact on Park's consolidated financial statements. ASU 2018-10 - Codification Improvements to Topic 842, Leases: In July 2018, the FASB issued ASU 2018-10 - Codification Improvements to Topic 842, Leases . This ASU includes amendments that clarify certain aspects of the guidance issued in ASU 2016-02. Park considered this clarification in determining the appropriate adoption of ASU 2016-02 on January 1, 2019. ASU 2018-11 - Leases (Topic 842): Targeted Improvements: In July 2018, the FASB issued ASU 2018-11 - Leases (Topic 842): Targeted Improvements . This ASU amends the guidance in ASU 2016-02 which is not yet effective. The amendments in the ASU provide entities with an additional (and optional) transition method to adopt the new leases standard. Under this new transition method, an entity initially applies the new leases standard at the adoption date and recognizes a cumulative-effect adjustment to the opening balance of retained earnings for the period of adoption. Additionally, this amendment provides lessors with a practical expedient, by class of asset, to not separate nonlease components from the associated lease component and, instead, to account for those components as a single component if certain criteria are met. Park considered this clarification in determining the appropriate adoption of ASU 2016-02 on January 1, 2019. ASU 2018-13 - Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement: In August 2018, the FASB issued ASU 2018-13 - Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement . This ASU modifies the disclosure requirements on fair value measurements in Topic 820, Fair Value Measurement by removing, modifying and adding certain requirements. The amendments in this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted upon issuance of this ASU. An entity is permitted to early adopt and remove or modify disclosures upon issuance of the ASU and delay adoption of the additional disclosures until their effective date. The adoption of this guidance will not have an impact on Park’s consolidated financial statements, but will impact disclosures. ASU 2018-14 - Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans: In August 2018, the FASB issued ASU 2018-14 - Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans . These amendments in this ASU modify the disclosure requirements for employers that sponsor defined benefit pension or other postretirement plans by removing disclosures that are no longer considered cost beneficial, clarifying the specific requirements of disclosures and adding disclosure requirements identified as relevant. The amendments in this ASU are effective for fiscal years ending after December 15, 2020. Early adoption is permitted. The adoption of this guidance will not have an impact on Park’s consolidated financial statements, but will impact disclosures. ASU 2018-16 - Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes: In October 2018, the FASB issued ASU 2018-16 - Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes. The amendments in this ASU permit use of the OIS rate based on SOFR as a U.S. benchmark interest rate for hedge accounting purposes under Topic 815 in addition to the interest rates on direct Treasury obligations of the U.S. government ("UST"), the LIBOR swap rate, the OIS rate based on the Fed Funds Effective Rate, and the SIFMA Municipal Swap Rate. The amendments in this ASU are effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted. The adoption of this guidance on January 1, 2019 did not have an impact on Park’s consolidated financial statements. ASU 2018-19 - Codification Improvements to Topic 326, Financial Instruments - Credit Losses: In November 2018, the FASB issued ASU 2018-19 - Codification Improvements to Topic 326, Financial Instruments - Credit Losses. The amendment in this ASU clarifies that receivables arising from operating leases are not within the scope of Subtopic 326-20. Impairment of receivables arising from operating leases should be accounted for in accordance with Topic 842, Leases. Park will consider this clarification in determining the appropriate adoption of ASU 2016-13, effective for annual reporting periods and interim reporting periods within those annual periods, beginning after December 15, 2019. ASU 2018-20 - Leases (Topic 842): Narrow - Scope Improvements for Lessors: In December 2018, the FASB issued ASU 2018-20 - Leases (Topic 842): Narrow - Scope Improvements for Lessors. The amendments in this ASU address the treatment of certain sales taxes and other similar taxes, certain lessor costs and recognition of variable payments for contracts with lease and nonlease components. Park considered this clarification in determining the appropriate adoption of ASU 2016-02 on January 1, 2019.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
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 16 Years

Business Combination (Tables)

Business Combination (Tables)	12 Months Ended
	Dec. 31, 2018
Business Acquisition, Pro Forma [Abstract]
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	The table below presents information with respect to the fair value of the NewDominion acquired loans as well as their book balance at the acquisition date. (in thousands) Book Balance Fair Value Commercial, financial and agricultural $ 19,246 $ 19,138 Commercial real estate 119,434 117,638 Construction real estate: Commercial 22,494 22,235 Mortgage 8,391 8,111 Residential real estate: Commercial 14,798 14,797 Mortgage 50,295 48,714 HELOC 37,651 36,688 Consumer 541 539 Purchased credit impaired 5,069 4,893 Total loans $ 277,919 $ 272,753 The following table summarizes the consideration paid for NewDominion and the amounts of the assets acquired and liabilities assumed at their fair value: (in thousands) Consideration Cash $ 30,684 Park common shares 48,519 Previous 8.55% investment in NewDominion 7,000 Fair value of total consideration transferred $ 86,203 Recognized amounts of identifiable assets acquired and liabilities assumed Cash and cash equivalents $ 42,954 Securities 1,954 Loans 272,753 Premises and equipment 940 Core deposit intangibles 6,249 Trade name intangible 1,300 Other assets 6,133 Total assets acquired $ 332,283 Deposits 284,231 Other liabilities 2,254 Total liabilities assumed 286,485 Net identifiable assets 45,798 Goodwill $ 40,405
Business Acquisition, Pro Forma Information [Table Text Block]	The following table presents supplemental pro forma information as if the acquisition had occurred at the beginning of 2017. The unaudited pro forma information includes adjustments for interest income on loans and securities acquired, amortization of intangibles arising from the transaction, depreciation expense on property acquired, interest expense on deposits acquired, and the related tax effects. The pro forma information is not necessarily indicative of the results of operations that would have occurred had the transactions been effected on the assumed dates. Twelve months ended December 31, (dollars in thousands, except per share data) 2018 2017 Net interest income $ 273,685 $ 257,604 Net income 115,118 89,092 Basic earnings per share 7.33 5.66 Diluted earnings per share 7.27 5.62

Investment Securities (Tables)

Investment Securities (Tables)	12 Months Ended
	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Cost and Equity Method Investments Disclosure [Text Block]	The carrying amount of other investment securities at December 31, 2018 and 2017 was as follows: (In thousands) December 31, 2018 December 31, 2017 FHLB stock $ 43,388 $ 50,086 FRB stock 8,225 8,225 Equity investments carried at fair value 1,649 1,935 Equity investments carried at cost/modified cost (1) 2,589 3,500 Total other investment securities $ 55,851 $ 63,746
Schedule of marketable securities	Investment securities at December 31, 2018 and December 31, 2017 were as follows: (In thousands) Amortized Cost Gross Unrealized/Unrecognized Holding Gains Gross Unrealized/Unrecognized Holding Losses Estimated Fair Value 2018: Debt Securities Available-for-Sale U.S. Government sponsored entities’ asset-backed securities $ 1,028,883 $ 453 $ 25,915 $ 1,003,421 Total $ 1,028,883 $ 453 $ 25,915 $ 1,003,421 2018: Debt Securities Held-to-Maturity Obligations of states and political subdivisions $ 305,278 $ 3,202 $ 2,672 $ 305,808 U.S. Government sponsored entities’ asset-backed securities 46,530 87 1,003 45,614 Total $ 351,808 $ 3,289 $ 3,675 $ 351,422 (In thousands) Amortized Cost Gross Unrealized/Unrecognized Holding Gains Gross Unrealized/Unrecognized Holding Losses Estimated Fair Value 2017: Debt Securities Available-for-Sale Obligations of U.S. Treasury and other U.S. Government sponsored entities $ 245,000 $ — $ 2,280 $ 242,720 U.S. Government sponsored entities’ asset-backed securities 852,645 4,645 8,129 849,161 Total $ 1,097,645 $ 4,645 $ 10,409 $ 1,091,881 2017: Debt Securities Held-to-Maturity Obligations of states and political subdivisions $ 300,412 $ 6,575 $ 713 $ 306,274 U.S. Government sponsored entities’ asset-backed securities 56,785 758 38 57,505 Total $ 357,197 $ 7,333 $ 751 $ 363,779
Schedule of unrealized loss on investments	The following table provides detail on investment securities with unrealized/unrecognized losses aggregated by investment category and length of time the individual securities had been in a continuous loss position at December 31, 2018 and December 31, 2017 : Less than 12 Months 12 Months or Longer Total (In thousands) Fair Value Unrealized/Unrecognized Losses Fair Value Unrealized/Unrecognized Losses Fair Value Unrealized/Unrecognized Losses 2018: Debt Securities Available-for-Sale U.S. Government sponsored entities' asset-backed securities $ 506,280 $ 5,998 $ 449,569 $ 19,917 $ 955,849 $ 25,915 Total $ 506,280 $ 5,998 $ 449,569 $ 19,917 $ 955,849 $ 25,915 2018: Debt Securities Held-to-Maturity Obligations of states and political subdivisions $ 91,960 $ 1,095 $ 70,723 $ 1,577 $ 162,683 $ 2,672 U.S. Government sponsored entities’ asset-backed securities 32,656 838 6,931 165 39,587 1,003 Total $ 124,616 $ 1,933 $ 77,654 $ 1,742 $ 202,270 $ 3,675 Less than 12 Months 12 Months or Longer Total (In thousands) Fair Value Unrealized/Unrecognized Losses Fair Value Unrealized/Unrecognized Losses Fair Value Unrealized/Unrecognized Losses 2017: Debt Securities Available-for-Sale Obligations of U.S. Treasury and other U.S. Government sponsored entities $ 24,931 $ 70 $ 217,789 $ 2,210 $ 242,720 $ 2,280 U.S. Government sponsored entities' asset-backed securities 236,924 2,786 318,797 5,343 555,721 8,129 Total $ 261,855 $ 2,856 $ 536,586 $ 7,553 $ 798,441 $ 10,409 2017: Debt Securities Held-to-Maturity Obligations of states and political subdivisions $ 26,644 $ 194 $ 45,498 $ 519 $ 72,142 $ 713 U.S. Government sponsored entities' asset-backed securities 7,331 38 — — 7,331 38 Total $ 33,975 $ 232 $ 45,498 $ 519 $ 79,473 $ 751
Schedule of contractual maturity of debt securities	The amortized cost and estimated fair value of investments in debt securities at December 31, 2018 , 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) Debt Securities Available-for-Sale U.S. Government sponsored entities’ asset-backed securities $ 1,028,883 $ 1,003,421 2.35 % Debt Securities Held-to-Maturity Obligations of states and political subdivisions Due five through ten years $ 4,036 $ 3,987 3.04 % Due greater than ten years 301,242 301,821 3.69 % Total $ 305,278 $ 305,808 3.68 % U.S. Government sponsored entities’ asset-backed securities $ 46,530 $ 45,614 2.83 %

Loans (Tables)

Loans (Tables)	12 Months Ended
	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Abstract]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table Text Block]	The following table provides changes in accretable discount for loans acquired with deteriorated credit quality: For the Year Ended (in thousands) December 31, 2018 December 31, 2017 Balance at the beginning of the period $ — $ — Acquisitions 176 — Reductions due to change in projected cash flows — — Reclass from non-accretable difference — — Transfers out 16 — Accretion 16 — Balance at end of period $ 144 $ —
Schedule of composition of loan portfolio by class of loan	The composition of the loan portfolio, by class of loan, as of December 31, 2018 and December 31, 2017 was as follows: 12/31/2018 12/31/2017 (In thousands) Loan Balance Accrued Interest Receivable Recorded Investment Loan Balance Accrued Interest Receivable Recorded Investment Commercial, financial and agricultural * $ 1,072,786 $ 4,603 $ 1,077,389 $ 1,053,453 $ 4,413 $ 1,057,866 Commercial real estate * 1,283,045 4,750 1,287,795 1,167,607 4,283 1,171,890 Construction real estate: Commercial 175,300 801 176,101 125,389 401 125,790 Mortgage 70,541 151 70,692 52,203 133 52,336 Installment 2,433 7 2,440 3,878 13 3,891 Residential real estate: Commercial 429,730 1,150 430,880 393,094 1,029 394,123 Mortgage 1,134,278 1,227 1,135,505 1,110,426 1,516 1,111,942 HELOC 215,283 1,159 216,442 203,178 974 204,152 Installment 14,327 36 14,363 18,526 53 18,579 Consumer 1,292,136 3,756 1,295,892 1,241,736 3,808 1,245,544 Leases 2,273 26 2,299 2,993 36 3,029 Total loans $ 5,692,132 $ 17,666 $ 5,709,798 $ 5,372,483 $ 16,659 $ 5,389,142 * 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 TDRs, and loans past due 90 days or more and still accruing by class of loan as of December 31, 2018 and December 31, 2017 : 12/31/2018 (In thousands) Nonaccrual Loans Accruing TDRs Loans Past Due 90 Days or More and Accruing Total Nonperforming Loans Commercial, financial and agricultural $ 14,998 $ 196 $ 10 $ 15,204 Commercial real estate 25,566 2,860 — 28,426 Construction real estate: Commercial 1,866 — — 1,866 Mortgage — 15 20 35 Installment 19 9 — 28 Residential real estate: Commercial 2,610 122 — 2,732 Mortgage 16,892 9,100 1,124 27,116 HELOC 2,158 1,028 9 3,195 Installment 468 1,049 24 1,541 Consumer 3,377 843 1,115 5,335 Total loans $ 67,954 $ 15,222 $ 2,302 $ 85,478 12/31/2017 (In thousands) Nonaccrual Loans Accruing TDRs Loans Past Due 90 Days or More and Accruing Total Nonperforming Loans Commercial, financial and agricultural $ 16,773 $ 1,291 $ — $ 18,064 Commercial real estate 12,979 5,163 — 18,142 Construction real estate: Commercial 986 338 — 1,324 Mortgage 8 92 — 100 Installment 52 — — 52 Residential real estate: Commercial 18,835 224 — 19,059 Mortgage 16,841 10,766 568 28,175 HELOC 1,593 1,025 14 2,632 Installment 586 616 7 1,209 Consumer 3,403 662 1,256 5,321 Total loans $ 72,056 $ 20,177 $ 1,845 $ 94,078
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, 2018 and December 31, 2017 . 12/31/2018 12/31/2017 (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 $ 15,194 $ 15,120 $ 74 $ 18,064 $ 18,039 $ 25 Commercial real estate 28,426 28,426 — 18,142 18,142 — Construction real estate: Commercial 1,866 1,866 — 1,324 1,324 — Mortgage 15 — 15 100 — 100 Installment 28 — 28 52 — 52 Residential real estate: Commercial 2,732 2,732 — 19,059 19,059 — Mortgage 25,992 — 25,992 27,607 — 27,607 HELOC 3,186 — 3,186 2,618 — 2,618 Installment 1,517 — 1,517 1,202 — 1,202 Consumer 4,220 — 4,220 4,065 — 4,065 Total loans $ 83,176 $ 48,144 $ 35,032 $ 92,233 $ 56,564 $ 35,669
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, 2018 and December 31, 2017 . 12/31/2018 12/31/2017 (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 $ 8,999 $ 3,713 $ — $ 19,899 $ 14,704 $ — Commercial real estate 26,663 26,213 — 18,974 18,060 — Construction real estate: Commercial 4,679 1,866 — 2,788 1,324 — Residential real estate: Commercial 2,691 2,374 — 19,346 19,012 — With an allowance recorded Commercial, financial and agricultural 13,736 11,407 2,169 5,394 3,335 681 Commercial real estate 2,255 2,213 86 137 82 2 Construction real estate: Commercial — — — — — — Residential real estate: Commercial 358 358 18 47 47 1 Total $ 59,381 $ 48,144 $ 2,273 $ 66,585 $ 56,564 $ 684
Schedule of average recorded investment and interest income recognized on loans individually evaluated for impairment	The following tables present the average recorded investment and interest income recognized subsequent to impairment on loans individually evaluated for impairment as of and for the years ended December 31, 2018 , 2017 , and 2016 : Year ended December 31, 2018 (In thousands) Recorded Investment as of December 31, 2018 Average recorded investment Interest income recognized Commercial, financial and agricultural $ 15,120 $ 21,000 $ 695 Commercial real estate 28,426 23,024 1,047 Construction real estate: Commercial 1,866 1,709 34 Residential real estate: Commercial 2,732 5,308 114 Consumer — — — Total $ 48,144 $ 51,041 $ 1,890 Year ended December 31, 2017 (In thousands) Recorded Investment as of December 31, 2017 Average recorded investment Interest income recognized Commercial, financial and agricultural $ 18,039 $ 23,154 $ 963 Commercial real estate 18,142 21,692 903 Construction real estate: Commercial 1,324 1,729 64 Residential real estate: Commercial 19,059 20,490 778 Consumer — 5 — Total $ 56,564 $ 67,070 $ 2,708 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: Commercial 2,226 5,503 66 Residential real estate: Commercial 23,102 24,341 2,942 Consumer — 3 — Total $ 70,426 $ 79,496 $ 4,777
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, 2018 and December 31, 2017 by class of loan. 12/31/2018 (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 $ 4,786 $ 1,375 $ 6,161 $ 1,071,228 $ 1,077,389 Commercial real estate 780 3,584 4,364 1,283,431 1,287,795 Construction real estate: Commercial — 1,635 1,635 174,466 176,101 Mortgage 133 20 153 70,539 70,692 Installment 28 19 47 2,393 2,440 Residential real estate: Commercial 683 1,104 1,787 429,093 430,880 Mortgage 13,210 8,553 21,763 1,113,742 1,135,505 HELOC 620 907 1,527 214,915 216,442 Installment 155 274 429 13,934 14,363 Consumer 9,524 2,131 11,655 1,284,237 1,295,892 Leases — — — 2,299 2,299 Total loans $ 29,919 $ 19,602 $ 49,521 $ 5,660,277 $ 5,709,798 (1) Includes an aggregate of $2.3 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans. (2) Includes an aggregate of $50.7 million of nonaccrual loans which are current in regards to contractual principal and interest payments. 12/31/2017 (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 $ 145 $ 1,043 $ 1,188 $ 1,056,678 $ 1,057,866 Commercial real estate 856 2,360 3,216 1,168,674 1,171,890 Construction real estate: Commercial 29 — 29 125,761 125,790 Mortgage 256 — 256 52,080 52,336 Installment 54 19 73 3,818 3,891 Residential real estate: Commercial 16 1,586 1,602 392,521 394,123 Mortgage 11,515 9,232 20,747 1,091,195 1,111,942 HELOC 616 876 1,492 202,660 204,152 Installment 239 253 492 18,087 18,579 Consumer 11,515 2,407 13,922 1,231,622 1,245,544 Leases — — — 3,029 3,029 Total loans $ 25,241 $ 17,776 $ 43,017 $ 5,346,125 $ 5,389,142 (1) Includes an aggregate of $1.8 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans. (2) Includes an aggregate of $56.1 million of nonaccrual loans which are current in regards to contractual principal and interest payments.
Schedule of recorded investment by loan grade	The tables below present the recorded investment by loan grade at December 31, 2018 and December 31, 2017 for all commercial loans: 12/31/2018 (In thousands) 5 Rated 6 Rated Nonaccrual and Accruing TDRs Purchased Credit Impaired (1) Pass-Rated Recorded Investment Commercial, financial and agricultural* $ 11,509 $ 444 $ 15,194 $ 148 $ 1,050,094 $ 1,077,389 Commercial real estate* 2,707 — 28,426 3,059 1,253,603 $ 1,287,795 Construction real estate: Commercial 1,560 — 1,866 503 172,172 $ 176,101 Residential real estate: Commercial 272 41 2,732 251 427,584 $ 430,880 Leases — — — — 2,299 $ 2,299 Total Commercial Loans $ 16,048 $ 485 $ 48,218 $ 3,961 $ 2,905,752 $ 2,974,464 * 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. (1) Excludes loans acquired with deteriorated credit quality which are nonaccrual or TDRs due to additional credit deterioration or modification post acquisition. These loans had a recorded investment of $475,000 at December 31, 2018 . 12/31/2017 (In thousands) 5 Rated 6 Rated Nonaccrual and Accruing TDRs Purchased Credit Impaired Pass Rated Recorded Investment Commercial, financial and agricultural* $ 17,272 $ 153 $ 18,064 $ — $ 1,022,377 $ 1,057,866 Commercial real estate* 5,322 457 18,142 — 1,147,969 1,171,890 Construction real estate: Commercial 278 — 1,324 — 124,188 125,790 Residential real estate: Commercial 216 1 19,059 — 374,847 394,123 Leases — — — — 3,029 3,029 Total Commercial Loans $ 23,088 $ 611 $ 56,589 $ — $ 2,672,410 $ 2,752,698
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, 2018 , 2017 and 2016 as well as the recorded investment of these contracts at December 31, 2018 , 2017 , and 2016 . 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, 2018 (In thousands) Number of Contracts Accruing Nonaccrual Recorded Investment Commercial, financial and agricultural 21 $ 28 $ 829 $ 857 Commercial real estate 17 414 3,172 3,586 Construction real estate: Commercial 1 — — — Mortgage — — — — Installment 2 10 — 10 Residential real estate: Commercial 3 54 363 417 Mortgage 25 842 854 1,696 HELOC 21 558 86 644 Installment 19 459 69 528 Consumer 283 204 1,249 1,453 Total loans 392 $ 2,569 $ 6,622 $ 9,191 Year ended December 31, 2017 (In thousands) Number of Contracts Accruing Nonaccrual Recorded Investment Commercial, financial and agricultural 29 $ 945 $ 2,770 $ 3,715 Commercial real estate 9 1,050 313 1,363 Construction real estate: Commercial — — — — Mortgage 1 — 8 8 Installment — — — — Residential real estate: Commercial 15 144 486 630 Mortgage 33 888 1,359 2,247 HELOC 19 474 102 576 Installment 11 251 43 294 Consumer 309 171 1,121 1,292 Total loans 426 $ 3,923 $ 6,202 $ 10,125 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: 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 Of those loans which were modified and determined to be a TDR during the year ended December 31, 2018 , $0.5 million were on nonaccrual status as of December 31, 2017 . Of those loans which were modified and determined to be a TDR during the year ended December 31, 2017 , $1.8 million were on nonaccrual status as of December 31, 2016 . 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 . 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, 2018 , December 31, 2017 , and December 31, 2016 . 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, 2018 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 3 $ 104 — $ — 7 $ 419 Commercial real estate — — 2 82 5 843 Construction real estate: Commercial — — — — — — Mortgage — — — — — — Installment — — — — — — Residential real estate: Commercial — — 2 117 7 848 Mortgage 8 518 6 467 15 1,201 HELOC 2 32 4 194 — — Installment 1 29 — — 1 3 Consumer 59 636 50 375 62 484 Leases — — — — — — Total loans 73 $ 1,319 $ 64 $ 1,235 97 $ 3,798

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 , 2017 , and 2016 is summarized in the following tables. Year ended December 31, 2018 (In thousands) Commercial, financial and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for credit losses: Beginning balance $ 15,022 $ 9,601 $ 4,430 $ 9,321 $ 11,614 $ — $ 49,988 Charge-offs 2,796 281 72 441 9,962 — 13,552 Recoveries (1,221 ) (272 ) (712 ) (844 ) (4,078 ) (4 ) (7,131 ) Net charge-offs (recoveries) 1,575 9 (640 ) (403 ) 5,884 (4 ) 6,421 Provision (Recovery) 3,330 176 (607 ) (993 ) 6,043 (4 ) 7,945 Ending balance $ 16,777 $ 9,768 $ 4,463 $ 8,731 $ 11,773 — $ 51,512 Year ended December 31, 2017 (In thousands) Commercial, financial and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for credit losses: Beginning balance $ 13,434 $ 10,432 $ 5,247 $ 10,958 $ 10,553 $ — $ 50,624 Charge-offs 6,017 1,798 105 1,208 10,275 — 19,403 Recoveries (809 ) (810 ) (2,124 ) (1,863 ) (4,603 ) (1 ) (10,210 ) Net charge-offs (recoveries) 5,208 988 (2,019 ) (655 ) 5,672 (1 ) 9,193 Provision (Recovery) 6,796 157 (2,836 ) (2,292 ) 6,733 (1 ) 8,557 Ending balance $ 15,022 $ 9,601 $ 4,430 $ 9,321 $ 11,614 $ — $ 49,988 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
Schedule of the composition of the allowance for loan losses	The composition of the allowance for loan losses at December 31, 2018 and 2017 was as follows: December 31, 2018 (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 $ 2,169 $ 86 $ — $ 18 $ — $ — $ 2,273 Collectively evaluated for impairment 14,608 9,682 4,463 8,713 11,773 — 49,239 Acquired with deteriorated credit quality — — — — — — — Total ending allowance balance $ 16,777 $ 9,768 $ 4,463 $ 8,731 $ 11,773 $ — $ 51,512 Loan balance: Loans individually evaluated for impairment $ 15,119 $ 28,418 $ 1,866 $ 2,732 $ — $ — $ 48,135 Loans collectively evaluated for impairment 1,057,520 1,251,579 245,909 1,790,637 1,292,136 2,273 5,640,054 Loans acquired with deteriorated credit quality (1) 147 3,048 499 249 — — 3,943 Total ending loan balance $ 1,072,786 $ 1,283,045 $ 248,274 $ 1,793,618 $ 1,292,136 $ 2,273 $ 5,692,132 Allowance for loan losses as a percentage of loan balance: Loans individually evaluated for impairment 14.35 % 0.30 % — % 0.66 % — % — % 4.72 % Loans collectively evaluated for impairment 1.38 % 0.77 % 1.81 % 0.49 % 0.91 % — % 0.87 % Loans acquired with deteriorated credit quality — % — % — % — % — % — % — % Total 1.56 % 0.76 % 1.80 % 0.49 % 0.91 % — % 0.90 % Recorded investment: Loans individually evaluated for impairment $ 15,120 $ 28,426 $ 1,866 $ 2,732 $ — $ — $ 48,144 Loans collectively evaluated for impairment 1,062,121 1,256,310 246,864 1,794,207 1,295,892 2,299 5,657,693 Loans acquired with deteriorated credit quality (1) 148 3,059 503 251 — — 3,961 Total ending recorded investment $ 1,077,389 $ 1,287,795 $ 249,233 $ 1,797,190 $ 1,295,892 $ 2,299 $ 5,709,798 (1) Excludes loans acquired with deteriorated credit quality which are individually evaluated for impairment due to additional credit deterioration post acquisition. These loans had a balance of $475,000 , a recorded investment of $475,000 , and zero allowance as of December 31, 2018 . December 31, 2017 (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 $ 681 $ 2 $ — $ 1 $ — $ — $ 684 Collectively evaluated for impairment 14,341 9,599 4,430 9,320 11,614 — 49,304 Total ending allowance balance $ 15,022 $ 9,601 $ 4,430 $ 9,321 $ 11,614 $ — $ 49,988 Loan balance: Loans individually evaluated for impairment $ 18,034 $ 18,131 $ 1,322 $ 19,058 $ — $ — $ 56,545 Loans collectively evaluated for impairment 1,035,419 1,149,476 180,148 1,706,166 1,241,736 2,993 5,315,938 Total ending loan balance $ 1,053,453 $ 1,167,607 $ 181,470 $ 1,725,224 $ 1,241,736 $ 2,993 $ 5,372,483 Allowance for loan losses as a percentage of loan balance: Loans individually evaluated for impairment 3.78 % 0.01 % — % 0.01 % — % — % 1.21 % Loans collectively evaluated for impairment 1.39 % 0.84 % 2.46 % 0.55 % 0.94 % — % 0.93 % Total 1.43 % 0.82 % 2.44 % 0.54 % 0.94 % — % 0.93 % Recorded investment: Loans individually evaluated for impairment $ 18,039 $ 18,142 $ 1,324 $ 19,059 $ — $ — $ 56,564 Loans collectively evaluated for impairment 1,039,827 1,153,748 180,693 1,709,737 1,245,544 3,029 5,332,578 Total ending recorded investment $ 1,057,866 $ 1,171,890 $ 182,017 $ 1,728,796 $ 1,245,544 $ 3,029 $ 5,389,142

Goodwill and Other Intangibles

Goodwill and Other Intangibles (Tables)	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets and Goodwill [Table Text Block]	The following table shows the activity in goodwill and other intangible assets for the year ended December 31, 2018. (in thousands) Goodwill Other Intangible Assets Total December 31, 2017 $ 72,334 $ — $ 72,334 Acquired goodwill and other intangible assets 40,405 7,549 47,954 Amortization — 578 578 December 31, 2018 $ 112,739 $ 6,971 $ 119,710
Intangible Assets Disclosure [Text Block]	The following table shows the balance of acquired intangible assets as of December 31, 2018. Park had no acquired intangible assets as of December 31, 2017. 2018 (in thousands) Gross Carrying Amount Accumulated Amortization Other intangible assets: Core deposit intangibles $ 6,249 $ 578 Trade name intangible 1,300 — Total $ 7,549 $ 578
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	The following is a schedule of estimated amortization expense for each of the next five years: (in thousands) Total 2019 $ 1,234 2020 1,149 2021 869 2022 629 2023 521

Foreclosed and Repossessed As_2

Foreclosed and Repossessed Assets (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 and December 31, 2017 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, 2018 December 31, 2017 OREO: Commercial real estate $ 2,359 $ 7,888 Construction real estate 1,108 4,852 Residential real estate 836 1,450 Total OREO $ 4,303 $ 14,190 Loans in process of foreclosure: Residential real estate $ 2,346 $ 2,948

Premises And Equipment (Tables)

Premises And Equipment (Tables)	12 Months Ended
	Dec. 31, 2018
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) 2018 2017 Land $ 20,062 $ 19,603 Buildings 79,706 77,711 Equipment, furniture and fixtures 65,659 55,799 Leasehold improvements 4,791 3,273 Total $ 170,218 $ 156,386 Less accumulated depreciation (110,447 ) (100,485 ) Premises and equipment, net $ 59,771 $ 55,901
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, before considering renewals, required for the next five years under such leases with initial terms in excess of one year: (In thousands) 2019 $ 2,839 2020 2,072 2021 1,653 2022 1,576 2023 1,420 Thereafter 810 Total $ 10,370

Investment in Qualified Affor_2

Investment in Qualified Affordable Housing (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 and 2017 . (In thousands) December 31, 2018 December 31, 2017 Affordable housing tax credit investments $ 50,347 $ 49,669 Unfunded commitments 22,282 14,282

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2018
Deposits [Abstract]
Schedule of summary of non-interest bearing and interest bearing deposits	At December 31, 2018 and 2017 , non-interest bearing and interest bearing deposits were as follows: December 31 (In thousands) 2018 2017 Non-interest bearing $ 1,804,881 $ 1,633,941 Interest bearing 4,455,979 4,183,385 Total $ 6,260,860 $ 5,817,326
Schedule of maturities of time deposits	At December 31, 2018 , the maturities of time deposits were as follows: (In thousands) 2019 $ 670,674 2020 248,938 2021 55,873 2022 47,190 2023 20,405 After 5 years 97 Total $ 1,043,177

Repurchase Agreement Borrowin_2

Repurchase Agreement Borrowings (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 and December 31, 2017 : December 31, 2018 (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 $ 164,966 $ — $ — $ — $ 164,966 December 31, 2017 (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 $ 182,185 $ — $ — $ 1,104 $ 183,289

Short-Term Borrowings (Tables)

Short-Term Borrowings (Tables)	12 Months Ended
	Dec. 31, 2018
Short-term Debt [Abstract]
Schedule of short-term debt	Short-term borrowings were as follows: December 31 (In thousands) 2018 2017 Securities sold under agreements to repurchase $ 164,966 $ 183,289 FHLB advances 57,000 208,000 Total short-term borrowings $ 221,966 $ 391,289 The outstanding balances for all short-term borrowings as of December 31, 2018 and 2017 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 2018 Ending balance $ 164,966 $ 57,000 Highest month-end balance 199,729 256,000 Average daily balance 172,774 44,553 Weighted-average interest rate: As of year-end 0.49 % 2.45 % Paid during the year 0.42 % 1.95 % 2017 Ending balance $ 183,289 $ 208,000 Highest month-end balance 230,905 208,000 Average daily balance 205,269 23,924 Weighted-average interest rate: As of year-end 0.41 % 1.64 % Paid during the year 0.35 % 1.16 %

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Schedule of maturities of long-term debt	Long-term debt is listed below: December 31, 2018 2017 (In thousands) Outstanding Balance Average Rate Outstanding Balance Average Rate Total Federal Home Loan Bank advances by year of maturity: 2018 $ — — % $ 150,000 2.04 % 2019 100,000 1.92 % 100,000 1.92 % 2020 50,000 2.04 % 50,000 2.04 % 2021 100,000 1.96 % 100,000 1.96 % 2022 50,000 3.01 % — — % 2023 100,000 3.40 % 100,000 3.40 % Thereafter — — % — — % Total $ 400,000 2.45 % 500,000 2.27 %

Share-Based Compensation Change

Share-Based Compensation Changes in nonvested shares (Tables)	12 Months Ended
	Dec. 31, 2018
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 the common shares subject to nonvested PBRSUs and TBRSUs for the years ended December 31, 2018 and 2017 follows: Common shares subject to PBRSUs and TBRSUs Nonvested at January 1, 2017 85,425 Granted 45,788 Vested (9,674 ) Forfeited (3,021 ) Adjustment for performance conditions of PBRSUs (1) (1,802 ) Nonvested at January 1, 2018 116,716 Granted 61,690 Vested (18,800 ) Forfeited (4,655 ) Adjustment for performance conditions of PBRSUs (1) (2,320 ) Nonvested at December 31, 2018 (2) 152,631

Share-Based Compensation Additi

Share-Based Compensation Additional share based compensation expense related to PBRSUs (Tables)	12 Months Ended
	Dec. 31, 2018
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 and TBRSUs currently outstanding: (In thousands) 2019 $ 3,580 2020 2,390 2021 1,010 2022 223 Total $ 7,203

Benefit Plans (Tables)

Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Defined Benefit Plan [Abstract]
Schedule of plan assets and benefit obligation activity	Using accrual measurement dates of December 31, 2018 and 2017 , plan assets and benefit obligation activity for the Pension Plan are listed below: (In thousands) 2018 2017 Change in fair value of plan assets Fair value at beginning of measurement period $ 195,735 $ 167,047 Actual return on plan assets (8,118 ) 21,573 Employer contributions — 15,000 Benefits paid (10,540 ) (7,885 ) Fair value at end of measurement period $ 177,077 $ 195,735 Change in benefit obligation Projected benefit obligation at beginning of measurement period $ 138,698 $ 114,455 Service cost 6,547 5,270 Interest cost 5,236 5,085 Actuarial (gain) loss (16,413 ) 21,773 Benefits paid (10,540 ) (7,885 ) Projected benefit obligation at the end of measurement period $ 123,528 $ 138,698 Funded status at end of year (fair value of plan assets less benefit obligation) $ 53,549 $ 57,037
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 2018 2017 Equity securities 50% - 100% 82 % 79 % Fixed income and cash equivalents remaining balance 18 % 21 % Total 100 % 100 %
Schedule of assumptions used to determine benefit obligations	The weighted average assumptions used to determine benefit obligations at December 31, 2018 , 2017 and 2016 were as follows: 2018 2017 2016 Discount rate 4.60 % 3.89 % 4.58 % 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 % 4.00 % 4.00 % 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): 2019 $ 8,428 2020 8,733 2021 9,787 2022 10,324 2023 9,698 2024-2028 51,726 Total $ 98,696
Schedule of balances of accumulated other comprehensive income loss	The following table shows ending balances of accumulated other comprehensive loss at December 31, 2018 and 2017 . (In thousands) 2018 2017 Prior service cost $ — $ — Net actuarial loss (37,560 ) (33,799 ) Total (37,560 ) (33,799 ) Deferred taxes 7,888 7,098 Disparate tax effect (1) — 3,175 Accumulated other comprehensive loss $ (29,672 ) $ (23,526 )
Schedule of components of net periodic benefit cost and other amounts recognized in other comprehensive income (loss)	Using actuarial measurement dates of December 31 for 2018 , 2017 and 2016 , components of net periodic benefit income and other amounts recognized in other comprehensive income were as follows: (In thousands) 2018 2017 2016 Affected Line Item in the Consolidated Statements of Income Components of net periodic benefit income and other amounts recognized in other comprehensive income (loss) Service cost $ (6,547 ) $ (5,270 ) $ (5,055 ) Employee benefits Interest cost (5,236 ) (5,085 ) (4,869 ) Other components of net periodic benefit income Expected return on plan assets 13,417 11,455 10,950 Other components of net periodic benefit income Recognized net actuarial loss (1,361 ) (576 ) (773 ) Other components of net periodic benefit income Net periodic benefit income $ 273 $ 524 $ 253 Net (loss) gain $ (5,122 ) $ (11,698 ) $ 168 Amortization of net loss 1,361 576 773 Total recognized in other comprehensive income (loss) (3,761 ) (11,122 ) 941 Total recognized in net benefit income and other comprehensive income (loss) $ (3,488 ) $ (10,598 ) $ 1,194
Schedule of assumptions used to determine costs	The weighted average assumptions used to determine net periodic benefit income for the years ended December 31, 2018 , 2017 and 2016 are listed below: 2018 2017 2016 Discount rate 3.89 % 4.58 % 4.88 % 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 % 4.00 % 3.00 % Ages 50 and over 3.00 % 3.00 % 3.00 % Expected long-term return on plan assets 7.00 % 7.00 % 7.25 %

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
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) 2018 2017 Deferred tax assets: Allowance for loan losses $ 10,818 $ 10,498 Accumulated other comprehensive loss – Pension plan 7,888 7,098 Accumulated other comprehensive loss – Unrealized losses on securities 5,347 946 Deferred compensation 2,896 2,744 OREO valuation adjustments 1,028 1,327 Net deferred loan fees 1,221 1,115 Deferred contract bonus 556 645 Nonvested equity-based compensation 1,567 1,069 Fixed assets 206 877 Net operating loss ("NOL") carryforward 4,663 — Other 824 1,230 Total deferred tax assets $ 37,014 $ 27,549 Deferred tax liabilities: Deferred investment income 6,120 6,120 Pension Plan 19,133 19,076 MSRs 2,137 2,034 Partnership adjustments 630 460 Purchase accounting adjustments 769 166 Other 210 198 Total deferred tax liabilities $ 28,999 $ 28,054 Net deferred tax asset (liability) $ 8,015 $ (505 )
Federal and state income taxes	The components of the provision for federal income taxes are shown below: December 31, (In thousands) 2018 2017 2016 Currently payable Federal $ 12,700 $ 20,660 $ 28,879 State 352 — — Amortization of qualified affordable housing projects 7,322 10,278 7,300 Deferred Federal 481 3,289 581 State 57 — — Total $ 20,912 $ 34,227 $ 36,760
Schedule of income tax rate reconciliation	The following is a reconciliation of income tax expense to the amount computed at the statutory federal corporate income tax rate of 21% for the year ended December 31, 2018 , and 35% for the years ended December 31, 2017 and 2016 . 2018 2017 2016 Statutory federal corporate income tax rate 21.0 % 35.0 % 35.0 % Changes in rates resulting from: Tax exempt interest income, net of disallowed interest (1.8 )% (2.8 )% (1.3 )% Bank owned life insurance (1.1 )% (1.4 )% (1.2 )% Investments in qualified affordable housing projects, net of tax benefits (1.3 )% (1.9 )% (1.7 )% KSOP dividend deduction (0.6 )% (1.0 )% (1.0 )% Impact of the Tax Cuts and Jobs Act (1) — % 1.0 % — % Non-taxable gain on NewDominion common stock (0.6 )% — % — % State income tax, net of federal tax benefits 0.2 % — % — % Other 0.1 % — % 0.1 % Effective tax rate 15.9 % 28.9 % 29.9 %
Reconciliation of unrecognized tax benefits	The following is a reconciliation of the beginning and ending amount of unrecognized tax benefits. (In thousands) 2018 2017 2016 January 1 Balance $ 664 $ 633 $ 558 Additions based on tax positions related to the current year 10 117 117 Additions for tax positions of prior years 781 — 38 Reductions for tax positions of prior years — (9 ) — Reductions due to statute of limitations (229 ) (77 ) (80 ) December 31 Balance $ 1,226 $ 664 $ 633

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 , 2017 and 2016 . Year ended December 31, (in thousands) Changes in Pension Plan assets and benefit obligations Unrealized gains and losses on AFS debt securities Total Beginning balance at January 1, 2018, as previously presented $ (23,526 ) $ (2,928 ) $ (26,454 ) Cumulative effect of change in accounting principle for marketable equity securities, net of tax — (995 ) (995 ) Beginning balance at January 1, 2018, as adjusted (23,526 ) (3,923 ) (27,449 ) Reclassification of disproportionate income tax effects (3,175 ) (631 ) (3,806 ) Net current period activity Other comprehensive loss before reclassifications (4,046 ) (17,586 ) (21,632 ) Amounts reclassified from accumulated other comprehensive loss 1,075 2,024 3,099 Net current period other comprehensive loss (2,971 ) (15,562 ) (18,533 ) Ending balance at December 31, 2018 $ (29,672 ) $ (20,116 ) $ (49,788 ) Beginning balance at January 1, 2017 $ (14,740 ) $ (3,005 ) $ (17,745 ) Other comprehensive (loss) gain before reclassifications (9,241 ) 1,261 (7,980 ) Amounts reclassified from accumulated other comprehensive loss 455 (1,184 ) (729 ) Net current period other comprehensive (loss) income (8,786 ) 77 (8,709 ) Ending balance at December 31, 2017 $ (23,526 ) $ (2,928 ) $ (26,454 ) 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 )
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, 2018 , 2017 and 2016 : Amount Reclassified from Accumulated Other Comprehensive Loss Affected Line Item in the Consolidated Statements of Income (In thousands) 2018 2017 2016 Amortization of defined benefit pension items Amortization of net loss 1,361 576 773 Employee benefits Income before income taxes 1,361 576 773 Income before income taxes Income taxes 286 121 271 Income taxes Net of income tax $ 1,075 $ 455 $ 502 Net income Unrealized gains & losses on available for sale securities Loss (gain) on the sale of investment securities $ 2,562 $ (1,821 ) $ — Net (loss) gain on the sale of investment securities Income before income taxes 2,562 (1,821 ) — Income before income taxes Income taxes 538 (637 ) — Income taxes Net of income tax $ 2,024 $ (1,184 ) $ — Net income

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2018
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 2018 2017 2016 Numerator: Net income $ 110,387 $ 84,242 $ 86,135 Denominator: Weighted-average common shares outstanding 15,488,982 15,295,573 15,332,553 Effect of dilutive PBRSUs and TBRSUs 122,507 94,779 72,607 Weighted-average common shares outstanding adjusted for the effect of dilutive PBRSUs and TBRSUs 15,611,489 15,390,352 15,405,160 Earnings per common share: Basic earnings per common share $ 7.13 $ 5.51 $ 5.62 Diluted earnings per common share $ 7.07 $ 5.47 $ 5.59

Financial Instruments With Of_2

Financial Instruments With Off-Balance Sheet Risk And Financial Instruments With Concentrations Of Credit Risk (Tables)	12 Months Ended
	Dec. 31, 2018
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) 2018 2017 Loan commitments $ 1,012,820 $ 893,205 Standby letters of credit 13,334 13,421

Loan Servicing (Tables)

Loan Servicing (Tables)	12 Months Ended
	Dec. 31, 2018
Transfers and Servicing of Financial Assets [Abstract]
Schedule of servicing assets at amortized value	Activity for MSRs and the related valuation allowance follows: December 31 (In thousands) 2018 2017 2016 MSRs: Carrying amount, net, beginning of year $ 9,688 $ 9,266 $ 9,008 Additions 1,591 1,941 2,286 Amortization (1,499 ) (1,624 ) (1,835 ) Change in valuation allowance 398 105 (193 ) Carrying amount, net, end of year $ 10,178 $ 9,688 $ 9,266 Valuation allowance: Beginning of year $ 630 $ 735 $ 542 Change in valuation allowance (398 ) (105 ) 193 End of year $ 232 $ 630 $ 735

Fair Values (Tables)

Fair Values (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Measurement Inputs and Valuation Techniques [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, 2018 using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2018 Assets Investment securities: U.S. Government sponsored entities’ asset-backed securities — 1,003,421 — 1,003,421 Equity securities 1,225 — 424 1,649 Mortgage loans held for sale — 4,158 — 4,158 Mortgage IRLCs — 87 — 87 Liabilities Fair value swap $ — $ — $ 226 $ 226 Fair Value Measurements at December 31, 2017 using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2017 Assets Investment securities: Obligations of U.S. Treasury and other U.S. Government sponsored entities $ — $ 242,720 $ — $ 242,720 U.S. Government sponsored entities’ asset-backed securities — 849,161 — 849,161 Equity securities 1,518 — 417 1,935 Mortgage loans held for sale — 4,148 — 4,148 Mortgage IRLCs — 94 — 94 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, 2018 and 2017 , 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, 2018 $ 417 $ (226 ) Total Gains (Losses) Included in other income 7 — Balance at December 31, 2018 $ 424 $ (226 ) Balance at January 1, 2017 $ 790 $ (226 ) Total Gains (Losses) Included in other comprehensive income 6 — Transfers out of Level 3 (1) (346 ) — Purchases, sales, issuances and settlements, other, net (33 ) — Balance at December 31, 2017 $ 417 $ (226 )
Schedule of assets and liabilities measured at fair value on a nonrecurring basis	Fair Value Measurements at December 31, 2018 Using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2018 Impaired loans recorded at fair value: Commercial real estate $ — $ — $ 4,059 $ 4,059 Construction real estate — — 1,635 1,635 Residential real estate — — 705 705 Total impaired loans recorded at fair value $ — $ — $ 6,399 $ 6,399 Mortgage servicing rights $ — $ 1,169 $ — $ 1,169 OREO recorded at fair value: Commercial real estate — — 2,295 2,295 Construction real estate — — 729 729 Residential real estate — — 650 650 Total OREO recorded at fair value $ — $ — $ 3,674 $ 3,674 Other repossessed assets $ — $ — $ 3,464 $ 3,464 Fair Value Measurements at December 31, 2017 Using: (In thousands) Level 1 Level 2 Level 3 Balance at December 31, 2017 Impaired loans recorded at fair value: Commercial real estate $ — $ — $ 2,735 $ 2,735 Construction real estate — — 127 127 Residential real estate — — 712 712 Total impaired loans recorded at fair value $ — $ — $ 3,574 $ 3,574 MSRs $ — $ 7,316 $ — $ 7,316 OREO recorded at fair value: Commercial real estate — — 2,295 2,295 Construction real estate — — 3,204 3,204 Residential real estate — — 1,021 1,021 Total OREO recorded at fair value $ — $ — $ 6,520 $ 6,520
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, 2018 and December 31, 2017 : December 31, 2018 (In thousands) Fair Value Valuation Technique Unobservable Input(s) Range (Weighted Average) Impaired loans: Commercial real estate $ 4,059 Sales comparison approach Adj to comparables 0.0% - 107.5% (31.1%) Income approach Capitalization rate 9.5% - 10.8% (10.6%) Cost approach Accumulated depreciation 4.2% - 90.1% (11.0%) Construction real estate $ 1,635 Sales comparison approach Adj to comparables 5.0% - 90.0% (26.1%) Residential real estate $ 705 Sales comparison approach Adj to comparables 0.0% - 40.0% (13.2%) Income approach Capitalization rate 10.5% (10.5%) Other real estate owned: Commercial real estate $ 2,295 Sales comparison approach Adj to comparables 0.9% - 68.4% (34.7%) Income approach Capitalization rate 13.0% (13.0%) Construction real estate $ 729 Sales comparison approach Adj to comparables 0.0% - 45.0% (21.7%) Residential real estate $ 650 Sales comparison approach Adj to comparables 30.4% - 54.6% (42.5%) December 31, 2017 (In thousands) Fair Value Valuation Technique Unobservable Input(s) Range (Weighted Average) Impaired loans: Commercial real estate $ 2,735 Sales comparison approach Adj to comparables 0.0% - 90.0% (22.7%) Income approach Capitalization rate 9.0% - 11.0% (9.9%) Cost approach Accumulated depreciation 90.1% (90.1%) Construction real estate $ 127 Sales comparison approach Adj to comparables 0.0% - 4.8% (2.4%) Residential real estate $ 712 Sales comparison approach Adj to comparables 0.3% - 33.0% (12.5%) Income approach Capitalization rate 10.5% (10.5%) Other real estate owned: Commercial real estate $ 2,295 Sales comparison approach Adj to comparables 0.9% - 68.4% (34.7%) Income approach Capitalization rate 13.0% (13.0%) Construction real estate $ 3,204 Sales comparison approach Adj to comparables 0.0% - 90.0% (24.5%) Bulk sale approach Discount rate 15.0% (15.0%) Residential real estate $ 1,021 Sales comparison approach Adj to comparables 1.2% - 79.7% (31.8%)
Fair value, by balance sheet grouping	The fair value of financial instruments at December 31, 2018 and December 31, 2017 , was as follows: December 31, 2018 Fair Value Measurements (In thousands) Carrying value Level 1 Level 2 Level 3 Total fair value Financial assets: Cash and money market instruments $ 167,214 $ 167,214 $ — $ — $ 167,214 Investment securities (1) 1,355,229 — 1,354,843 — 1,354,843 Other investment securities (2) 1,649 1,225 — 424 1,649 Mortgage loans held for sale 4,158 — 4,158 — 4,158 Mortgage IRLCs 87 — 87 — 87 Impaired loans carried at fair value 6,399 — — 6,399 6,399 Other loans, net (3) 5,629,976 — — 5,570,136 5,570,136 Loans receivable, net $ 5,640,620 $ — $ 4,245 $ 5,576,535 $ 5,580,780 Financial liabilities: Time deposits 1,043,177 — 1,044,620 — 1,044,620 Other 1,267 1,267 — — 1,267 Total deposits $ 1,044,444 $ 1,267 $ 1,044,620 $ — $ 1,045,887 Short-term borrowings $ 221,966 $ — $ 221,966 $ — $ 221,966 Long-term debt 400,000 — 400,203 — 400,203 Subordinated notes 15,000 — 12,959 — 12,959 Derivative financial instruments: Fair value swap $ 226 $ — $ — $ 226 $ 226 (1) Includes AFS debt securities and HTM debt securities. (2) Excludes FHLB stock and FRB stock which are carried at their respective redemption values. Additionally, excludes investment securities accounted for at modified cost, as these investment securities do not have a readily determinable fair value. (3) Fair value calculated using an exit price notion consistent with Topic 820, Fair Value Measurement. December 31, 2017 Fair Value Measurements (In thousands) Carrying value Level 1 Level 2 Level 3 Total fair value Financial assets: Cash and money market instruments $ 169,112 $ 169,112 $ — $ — $ 169,112 Investment securities (1) 1,449,078 — 1,455,660 — 1,455,660 Other investment securities (2) 1,935 1,518 — 417 1,935 Loans held for sale 4,148 — 4,148 — 4,148 Mortgage IRLCs 94 — 94 — 94 Impaired loans carried at fair value 3,574 — — 3,574 3,574 Other loans, net 5,314,679 — — 5,247,021 5,247,021 Loans receivable, net $ 5,322,495 $ — $ 4,242 $ 5,250,595 $ 5,254,837 Financial liabilities: Time deposits 1,033,476 — 1,035,093 — 1,035,093 Other 1,269 1,269 — — 1,269 Total deposits $ 1,034,745 $ 1,269 $ 1,035,093 $ — $ 1,036,362 Short-term borrowings $ 391,289 $ — $ 391,289 $ — $ 391,289 Long-term debt 500,000 — 504,503 — 504,503 Subordinated notes 15,000 — 13,370 — 13,370 Derivative financial instruments: Fair value swap $ 226 $ — $ — $ 226 $ 226 (1) Includes AFS debt securities and HTM debt securities. (2) Excludes FHLB stock and FRB stock which are carried at their respective redemption values. Additionally, excludes investment securities accounted for at modified cost, as these investment securities do not have a readily determinable fair value.
Impaired Financing Receivables [Table Text Block]	December 31, 2018 (In thousands) Recorded Investment Prior Charge-Offs Specific Valuation Allowance Carrying Balance Impaired loans recorded at fair value $ 6,503 $ 3,630 $ 104 $ 6,399 Remaining impaired loans 41,641 7,616 2,169 39,472 Total impaired loans $ 48,144 $ 11,246 $ 2,273 $ 45,871 December 31, 2017 (In thousands) Recorded Investment Prior Charge-Offs Specific Valuation Allowance Carrying Balance Impaired loans recorded at fair value $ 3,577 $ 2,780 $ 3 $ 3,574 Remaining impaired loans 52,987 7,260 681 52,306 Total impaired loans $ 56,564 $ 10,040 $ 684 $ 55,880

Capital Ratios (Tables)

Capital Ratios (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 and 2017. As of December 31, 2018 Leverage Tier 1 Risk-Based Common Equity Tier 1 Total Risk-Based PNB 8.29 % 11.01 % 11.01 % 12.30 % Park 10.04 % 13.30 % 13.04 % 14.19 % 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 5.00 % 8.00 % 6.50 % 10.00 % Well-capitalized ratio - Park N/A 6.00 % N/A 10.00 % As of December 31, 2017 Leverage Tier 1 Risk-Based Common Equity Tier 1 Total Risk-Based PNB 7.36 % 10.35 % 10.35 % 11.60 % Park 9.44 % 13.22 % 12.94 % 14.14 % 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 5.00 % 8.00 % 6.50 % 10.00 % Well-capitalized ratio - Park N/A 6.00 % N/A 10.00 %
Schedule of various measures of capital ratio	The following table reflects various measures of capital for Park and PNB: To Be Adequately Capitalized To Be Well-Capitalized (In thousands) Actual Amount Ratio Amount Ratio Amount Ratio At December 31, 2018 Total Risk-Based Capital PNB $ 709,101 12.30 % $ 461,293 8.00 % $ 576,617 10.00 % Park 826,006 14.19 % 465,732 8.00 % 582,166 10.00 % Tier 1 Risk-Based Capital PNB $ 634,909 11.01 % $ 345,970 6.00 % $ 461,293 8.00 % Park 774,369 13.30 % 349,299 6.00 % 349,299 6.00 % Leverage Ratio PNB $ 634,909 8.29 % $ 306,485 4.00 % $ 383,106 5.00 % Park 774,369 10.04 % 308,397 4.00 % N/A N/A Common Equity Tier 1 PNB $ 634,909 11.01 % $ 259,478 4.50 % $ 374,801 6.50 % Park 759,369 13.04 % 261,975 4.50 % N/A N/A At December 31, 2017 Total Risk-Based Capital PNB $ 628,440 11.60 % $ 433,406 8.00 % $ 541,757 10.00 % Park 775,867 14.14 % 438,981 8.00 % 548,726 10.00 % Tier 1 Risk-Based Capital PNB $ 560,530 10.35 % $ 325,054 6.00 % $ 433,406 8.00 % Park 725,221 13.22 % 329,235 6.00 % 329,235 6.00 % Leverage Ratio PNB $ 560,530 7.36 % $ 304,722 4.00 % $ 380,903 5.00 % Park 725,221 9.44 % 307,441 4.00 % N/A N/A Common Equity Tier 1 PNB 560,530 10.35 % 243,791 4.50 % 352,142 6.50 % Park 710,221 12.94 % 246,927 4.50 % N/A N/A

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Dec. 31, 2018
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 PNB, 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, 2018 (In thousands) PNB GFSC SEPH All Other Total Net interest income $ 258,547 $ 5,048 $ 2,611 $ 692 $ 266,898 Provision for (recovery of) loan losses 7,569 1,328 (952 ) — 7,945 Other income 88,981 187 5,900 6,033 101,101 Other expense 206,843 3,245 4,049 14,618 228,755 Income (loss) before income taxes 133,116 662 5,414 (7,893 ) 131,299 Income tax expense (benefit) 23,644 141 1,137 (4,010 ) 20,912 Net income (loss) $ 109,472 $ 521 $ 4,277 $ (3,883 ) $ 110,387 Balances at December 31, 2018 Assets $ 7,753,848 $ 31,388 $ 8,428 $ 10,644 $ 7,804,308 Loans 5,671,173 32,664 1,636 (13,341 ) 5,692,132 Deposits 6,334,796 4,142 — (78,078 ) 6,260,860 Operating results for the year ended December 31, 2017 (In thousands) PNB GFSC SEPH All Other Total Net interest income $ 235,243 $ 5,839 $ 2,089 $ 588 $ 243,759 Provision for (recovery of) loan losses 9,898 1,917 (3,258 ) — 8,557 Other income 82,742 103 519 3,065 86,429 Other expense 185,891 3,099 5,367 8,805 203,162 Income (loss) before income taxes 122,196 926 499 (5,152 ) 118,469 Income tax expense (benefit) 34,881 666 1,375 (2,695 ) 34,227 Net income (loss) $ 87,315 $ 260 $ (876 ) $ (2,457 ) $ 84,242 Balances at December 31, 2017 Assets $ 7,467,851 $ 32,077 $ 24,902 $ 12,790 $ 7,537,620 Loans 5,339,255 33,385 10,891 (11,048 ) 5,372,483 Deposits 5,896,676 3,449 — (82,799 ) 5,817,326 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 79,959 57 3,068 955 84,039 Other expense 182,718 4,515 7,367 9,731 204,331 Income (loss) before income taxes 122,206 (471 ) 10,074 (8,914 ) 122,895 Income tax expense (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
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: 2018 (In thousands) Net Interest Income Depreciation Expense Other Expense Income Taxes Assets Deposits Totals for reportable segments $ 266,206 $ 8,585 $ 205,552 $ 24,922 $ 7,793,664 $ 6,338,938 Elimination of intersegment items 1,275 — — — (16,521 ) (78,078 ) Parent Co. totals - not eliminated (583 ) — 14,618 (4,010 ) 27,165 — Totals $ 266,898 $ 8,585 $ 220,170 $ 20,912 $ 7,804,308 $ 6,260,860 2017 (In thousands) Net Interest Income Depreciation Expense Other Expense Income Taxes Assets Deposits Totals for reportable segments $ 243,171 $ 8,644 $ 185,713 $ 36,922 $ 7,524,830 $ 5,900,125 Elimination of intersegment items 1,500 — — — (14,679 ) (82,799 ) Parent Co. totals - not eliminated (912 ) — 8,805 (2,695 ) 27,469 — Totals $ 243,759 $ 8,644 $ 194,518 $ 34,227 $ 7,537,620 $ 5,817,326 2016 (In thousands) Net Interest Income Depreciation Expense Other Expense Income Taxes Assets Deposits Totals for reportable segments $ 238,224 $ 8,396 $ 186,204 $ 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 $ 195,935 $ 36,760 $ 7,467,586 $ 5,521,956

Parent Company Statements (Tabl

Parent Company Statements (Tables)	12 Months Ended
	Dec. 31, 2018
Condensed Financial Information Disclosure [Abstract]
Balance Sheets	Condensed Balance Sheets December 31, 2018 and 2017 (In thousands) 2018 2017 Assets: Cash $ 75,094 $ 79,452 Investment in subsidiaries 727,773 645,287 Debentures receivable from PNB 25,000 25,000 Other investments 1,165 1,398 Other assets 25,972 26,838 Total assets $ 855,004 $ 777,975 Liabilities: Subordinated notes 15,000 15,000 Other liabilities 7,498 6,874 Total liabilities 22,498 21,874 Total shareholders’ equity 832,506 756,101 Total liabilities and shareholders’ equity $ 855,004 $ 777,975
Statements of Income	Condensed Statements of Income for the years ended December 31, 2018, 2017 and 2016 (In thousands) 2018 2017 2016 Income: Dividends from subsidiaries $ 100,000 $ 60,000 $ 60,000 Interest and dividends 1,275 1,500 2,164 Gain on sale of investment securities — 1,821 — Other 6,068 1,405 1,081 Total income 107,343 64,726 63,245 Expense: Interest expense 617 1,073 2,429 Other, net 14,619 8,805 9,730 Total expense 15,236 9,878 12,159 Income before income taxes and equity in undistributed income of subsidiaries 92,107 54,848 51,086 Income tax benefit 4,010 2,695 4,357 Income before equity in undistributed income of subsidiaries 96,117 57,543 55,443 Equity in undistributed income of subsidiaries 14,270 26,699 30,692 Net income $ 110,387 $ 84,242 $ 86,135 Other comprehensive loss (1) (18,533 ) (8,709 ) (2,102 ) Comprehensive income $ 91,854 $ 75,533 $ 84,033
Statements of Cash Flows	Statements of Cash Flows for the years ended December 31, 2018, 2017 and 2016 (In thousands) 2018 2017 2016 Operating activities: Net income $ 110,387 $ 84,242 $ 86,135 Adjustments to reconcile net income to net cash provided by operating activities: Undistributed income of subsidiaries (14,270 ) (26,699 ) (30,692 ) Compensation expense for issuance of treasury shares to directors 1,109 1,241 950 Share-based compensation expense 3,954 2,701 1,864 Realized net investment security gains — (1,821 ) — Gain on equity securities, net (3,267 ) — — (Increase) decrease in other assets (2,073 ) 205 (3,425 ) (Decrease) increase in other liabilities (163 ) 475 (2,524 ) Net cash provided by operating activities 95,677 60,344 52,308 Investing activities: Proceeds from sales of securities — 2,265 — Outlays for business acquisitions (30,684 ) — — Repayment of investments in and advances to subsidiaries — — 15,000 Other, net 60 — — Net cash (used in) provided by investing activities (30,624 ) 2,265 15,000 Financing activities: Cash dividends paid (63,013 ) (57,493 ) (57,653 ) Repayment of subordinated notes — (30,000 ) — Repurchase of treasury shares (5,784 ) (7,378 ) — Cash payment for fractional shares (4 ) (6 ) (4 ) Value of common shares withheld to pay employee income taxes (610 ) (347 ) — Net cash used in financing activities (69,411 ) (95,224 ) (57,657 ) (Decrease) increase in cash (4,358 ) (32,615 ) 9,651 Cash at beginning of year 79,452 112,067 102,416 Cash at end of year $ 75,094 $ 79,452 $ 112,067

Revenue from Contract with Cust

Revenue from Contract with Customers (Tables)	12 Months Ended
	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue [Table Text Block]	The following table presents Park's sources of other income by revenue stream and operating segment for the years ended December 31, 2018 , December 31, 2017 and December 31, 2016 . Year Ended Revenue by Operating Segment (in thousands) PNB GFSC SEPH All Other Total Income from fiduciary activities Personal trust and agency accounts $ 8,495 $ — $ — $ — $ 8,495 Employee benefit and retirement-related accounts 6,863 — — — 6,863 Investment management and investment advisory agency accounts 9,352 — — — 9,352 Other 1,583 — — — 1,583 Service charges on deposit accounts Non-sufficient funds (NSF) fees 7,483 — — — 7,483 Demand deposit account (DDA) charges 3,310 — — — 3,310 Other 668 — — — 668 Other service income (1) Credit card 2,212 27 — — 2,239 HELOC 471 — — — 471 Installment 243 — — — 243 Real estate 9,079 — — — 9,079 Commercial 1,153 — 1,081 — 2,234 Checkcard fee income 17,317 — — — 17,317 Bank owned life insurance income (2) 4,903 — — 1,912 6,815 ATM fees 1,978 — — — 1,978 OREO valuation adjustments (2) (272 ) — (219 ) — (491 ) Gain on the sale of OREO, net 1,440 — 2,795 — 4,235 Net loss on the sale of investment securities (2) (2,271 ) — — — (2,271 ) (Loss) gain on equity securities, net (2) (53 ) — — 3,266 3,213 Other components of net periodic pension benefit income (2) 6,609 75 136 — 6,820 Gain on the sale of non-performing loans (2) 660 — 2,166 — 2,826 Miscellaneous (3) 7,758 85 (59 ) 855 8,639 Total other income $ 88,981 $ 187 $ 5,900 $ 6,033 $ 101,101 (1) Of the $14.3 million of revenue included within "Other service income", approximately $5.5 million is within the scope of ASC 606, with the remaining $8.8 million consisting primarily of residential real estate loan fees which are out of scope. (2) Not within the scope of ASC 606. (3) "Miscellaneous" income includes brokerage income, safe deposit box rentals, and miscellaneous bank fees totaling $8.6 million , all of which are within the scope of ASC 606 . Year Ended December 31, 2017 (4) Revenue by Operating Segment (in thousands) PNB GFSC SEPH All Other Total Income from fiduciary activities Personal trust and agency accounts $ 7,752 $ — $ — $ — $ 7,752 Employee benefit and retirement-related accounts 6,234 — — — 6,234 Investment management and investment advisory agency accounts 8,386 — — — 8,386 Other 1,363 — — — 1,363 Service charges on deposit accounts Non-sufficient funds (NSF) fees 8,122 — — — 8,122 Demand deposit account (DDA) charges 3,847 — — — 3,847 Other 684 — — — 684 Other service income (1) Credit card 1,987 (6 ) — — 1,981 HELOC 474 — 4 — 478 Installment 387 — — — 387 Real estate 8,974 — 31 — 9,005 Commercial 1,118 — 193 — 1,311 Checkcard fee income 15,798 — — — 15,798 Bank owned life insurance income (2) 4,441 — — 417 4,858 ATM fees 2,253 — — — 2,253 OREO valuation adjustments (2) (458 ) — — — (458 ) Gain on the sale of OREO, net 239 — 12 — 251 Net gain on sale of investment securities (2) — — — 1,821 1,821 Other components of net periodic pension benefit income (2) 5,616 63 115 — 5,794 Miscellaneous (3) 5,525 46 164 827 6,562 Total other income $ 82,742 $ 103 $ 519 $ 3,065 $ 86,429 (1) Of the $13.2 million of revenue included within "Other service income", approximately $4.4 million is within the scope of ASC 606, with the remaining $8.8 million consisting primarily of residential real estate loan fees which are out of scope. (2) Not within the scope of ASC 606. (3) "Miscellaneous" income includes brokerage income, safe deposit box rentals, and miscellaneous bank fees totaling $6.6 million , all of which are within the scope of ASC 606. (4) The Corporation elected the modified retrospective approach of adoption; therefore, prior period balances are presented under legacy GAAP and may not be comparable to current year presentation. Year Ended December 31, 2016 (4) Revenue by Operating Segment (in thousands) PNB GFSC SEPH All Other Total Income from fiduciary activities Personal trust and agency accounts 7,101 — — — $ 7,101 Employee benefit and retirement-related accounts 5,432 — — — 5,432 Investment management and investment advisory agency accounts 7,693 — — — 7,693 Other 1,174 — — — 1,174 Service charges on deposit accounts Non-sufficient funds (NSF) fees 8,970 — — — 8,970 Demand deposit account (DDA) charges 3,932 — — — 3,932 Other 1,357 — — — 1,357 Other service income (1) Credit card 1,584 — — — 1,584 HELOC 453 — 5 — 458 Installment 638 — — — 638 Real estate 9,319 — — — 9,319 Commercial 739 — 1,681 — 2,420 Checkcard fee income 15,057 — — — 15,057 Bank owned life insurance income (2) 3,913 — — 425 4,338 ATM fees 2,268 — — — 2,268 OREO valuation adjustments (2) (583 ) — (18 ) — (601 ) Gain on the sale of OREO, net 257 — 1,066 — 1,323 Other components of net periodic pension benefit income (2) 5,156 58 94 — 5,308 Miscellaneous (3) 5,499 (1 ) 240 530 6,268 Total other income $ 79,959 $ 57 $ 3,068 $ 955 $ 84,039 (1) Of the $14.4 million of revenue included within "Other service income", approximately $5.4 million is within the scope of ASC 606, with the remaining $9.0 million consisting primarily of residential real estate loan fees which are out of scope. (2) Not within the scope of ASC 606. (3) "Miscellaneous" income includes brokerage income, safe deposit box rentals, and miscellaneous bank fees totaling $6.3 million , all of which are within the scope of ASC 606. (4) The Corporation elected the modified retrospective approach of adoption; therefore, prior period balances are presented under legacy GAAP and may not be comparable to current year presentation.

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Line Items]
Other Repossessed Assets	$ 3,954	$ 5,510
Goodwill	112,739	72,334
Other Intangible Assets, Net	6,971	0
Average required reserve balance	$ 73,900	$ 64,800
Historical loss period used in estimating loan loss reserve	108 months	96 months
Reserve coverage period in historical losses	1 year 10 months 14 days	1 year 11 months 2 days
Compensating Balance, Amount	$ 0
Goodwill, Acquired During Period	$ 40,405
Commercial Loan
Accounting Policies [Line Items]
Reserve coverage period in historical losses	3 years 4 months 21 days	3 years 2 months 28 days
Consumer
Accounting Policies [Line Items]
Financing Receivable, Allowance for Credit Losses, Factors that Influenced Management's Judgment	0.0033	0.0034
Commercial Portfolio Segment [Member]
Accounting Policies [Line Items]
Financing Receivable, Allowance for Credit Losses, Factors that Influenced Management's Judgment	0.0035	0.0037

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Depreciable Lives of Premises and Equipment (Details)	12 Months Ended
	Dec. 31, 2018
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	16 years

Adoption of New Accounting Pr_3

Adoption of New Accounting Pronouncements and Issued Not Yet Effective Accounting Standards (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Adjustments for New Accounting Pronouncement [Member] | Retained Earnings
New Accounting Pronouncement, Early Adoption [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		$ 3,806
Adjustments for New Accounting Pronouncement [Member] | Accumulated Other Comprehensive (Loss) Income
New Accounting Pronouncement, Early Adoption [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption		(3,806)
Adjustments for New Accounting Pronouncement [Member] | Other Assets [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 11,100
Adjustments for New Accounting Pronouncement [Member] | Other Liabilities [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 11,000
AOCI Including Portion Attributable to Noncontrolling Interest [Member] | Accounting Standards Update 2016-01 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		$ (995)

Business Combination (Details)

Business Combination (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jul. 01, 2018
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Revenue		$ 273,685	$ 257,604
Business Combination, Acquired Receivable, Fair Value		272,753
Business Combination, Acquired Receivables, Gross Contractual Amount		277,919			$ 277,900
Business Acquisition, Share Price					$ 1.08
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain		3,500
Stock Issued During Period, Shares, Acquisitions	435,457
Payments to Acquire Businesses, Gross		$ 30,684	0	$ 0
Business Acquisition, Percentage of Voting Interests Acquired		91.50%
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable		$ 48,519
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value		7,000
Business Combination, Consideration Transferred		86,203
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents		42,954
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities		1,954
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables		272,753			$ 272,753
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment		940
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		6,249
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets		1,300
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets		6,133
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		332,283
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities		284,231
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities		2,254
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		286,485
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		45,798
Goodwill, Acquired During Period		$ 40,405
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage		8.60%
Business Acquisition, Transaction Costs		$ 4,600
Business Combination, Consideration Transferred allocation percentage stock	60.00%
Business Combination, Consideration Transferred allocation percentage cash	40.00%
Business Acquisition, Pro Forma Net Income (Loss)		$ 115,118	$ 89,092
Business Acquisition, Pro Forma Earnings Per Share, Basic		$ 7.33	$ 5.66
Business Acquisition, Pro Forma Earnings Per Share, Diluted		$ 7.27	$ 5.62
Common Shares
Business Acquisition [Line Items]
Business Acquisition, Share Price					$ 0.01
Professional fees and services [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Business Acquisition, Transaction Costs		$ 2,500
Salaries [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Business Acquisition, Transaction Costs		2,000
Employee benefits [Member]
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Business Acquisition, Transaction Costs		100
Performing Financial Instruments [Member]
Business Acquisition [Line Items]
Business Combination, Acquired Receivable, Fair Value					$ 267,900
Business Combination, Acquired Receivables, Gross Contractual Amount					$ 273,700
Commercial Financial Agricultural [Member]
Business Acquisition [Line Items]
Business Combination, Acquired Receivable, Fair Value		19,138
Business Combination, Acquired Receivables, Gross Contractual Amount		19,246
Commercial Real Estate [Member]
Business Acquisition [Line Items]
Business Combination, Acquired Receivable, Fair Value		117,638
Business Combination, Acquired Receivables, Gross Contractual Amount		119,434
Construction Real Estate Commercial [Domain]
Business Acquisition [Line Items]
Business Combination, Acquired Receivable, Fair Value		22,235
Business Combination, Acquired Receivables, Gross Contractual Amount		22,494
Mortgage
Business Acquisition [Line Items]
Business Combination, Acquired Receivable, Fair Value		8,111
Business Combination, Acquired Receivables, Gross Contractual Amount		8,391
Commercial
Business Acquisition [Line Items]
Business Combination, Acquired Receivable, Fair Value		14,797
Business Combination, Acquired Receivables, Gross Contractual Amount		14,798
Mortgage
Business Acquisition [Line Items]
Business Combination, Acquired Receivable, Fair Value		48,714
Business Combination, Acquired Receivables, Gross Contractual Amount		50,295
HELOC
Business Acquisition [Line Items]
Business Combination, Acquired Receivable, Fair Value		36,688
Business Combination, Acquired Receivables, Gross Contractual Amount		37,651
Leases
Business Acquisition [Line Items]
Business Combination, Acquired Receivable, Fair Value		539
Business Combination, Acquired Receivables, Gross Contractual Amount		541
Purchased credit impaired [Member]
Business Acquisition [Line Items]
Business Combination, Acquired Receivable, Fair Value		4,893
Business Combination, Acquired Receivables, Gross Contractual Amount		$ 5,069

Investment Securities - Narrat

Investment Securities - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Investments [Line Items]
Gain on equity securities, net	$ 3,213,000	$ 0	$ 0
Pledged Financial Instruments, Not Separately Reported, Securities	332,000,000	317,000,000
Pledged Financial Instruments, Not Separately Reported, Securities for Repurchase Agreements	280,000,000	215,000,000
Pledged Financial Instruments, Not Separately Reported, Securities for Federal Home Loan Bank	$ 21,913,000	$ 24,900,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%	35.00%
Other than Temporary Impairment Losses, Investments	$ 0	$ 0	$ 0
Debt Securities, Available-for-sale, Amortized Cost	1,028,883,000	1,097,645,000
Debt Securities, Available-for-sale, Realized Gain	60,000
Amortized cost of securities available-for-sale	1,028,883,000	1,097,645,000
Debt securities held-to-maturity, at amortized cost (fair value of $351,422 and $363,779 at December 31, 2018 and 2017, respectively)	351,808,000	357,197,000
Federal home loan bank stock	43,388,000	50,086,000
Federal reserve bank stock	8,225,000	8,225,000
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%
Debt Securities, Available-for-sale, Realized Loss	$ 2,600,000
Debt Securities, Held-to-maturity, Sold, Realized Gain (Loss)	$ 291,000
percent of held to securities sold paid down	96.30%
Equity Securities, FV-NI	$ 1,649,000	1,935,000
Equity Securities without Readily Determinable Fair Value, Amount	2,589,000	3,500,000
Other investment securities	55,851,000	63,746,000
Debt Securities sold at a loss [Domain]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	245,000,000
Equity securities
Schedule of Investments [Line Items]
Equity Securities, FV-NI, Unrealized Gain	(3,500,000)
Common Shares
Schedule of Investments [Line Items]
Gain on equity securities, net	(287,000)
Securities sold at a gain [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2,000,000
Amortized cost of securities available-for-sale			$ 0
Debt securities held-to-maturity, at amortized cost (fair value of $351,422 and $363,779 at December 31, 2018 and 2017, respectively)	7,400,000
Available-for-sale Securities, Equity Securities	$ 444,000
Debt and Equity Securities, Realized Gain (Loss)		1,821,000
U.S. Government sponsored entity asset-backed securities
Schedule of Investments [Line Items]
Asset-backed securities mortgage portfolio, maturity term	15 years
Debt Securities, Available-for-sale, Amortized Cost	$ 1,028,883,000	852,645,000
Debt securities held-to-maturity, at amortized cost (fair value of $351,422 and $363,779 at December 31, 2018 and 2017, respectively)	46,530,000	$ 56,785,000
Residential mortgage-backed securities
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	705,300,000
Debt securities held-to-maturity, at amortized cost (fair value of $351,422 and $363,779 at December 31, 2018 and 2017, respectively)	0
Collateralized mortgage-backed securities
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	323,600,000
Debt securities held-to-maturity, at amortized cost (fair value of $351,422 and $363,779 at December 31, 2018 and 2017, respectively)	$ 46,500,000

Investment Securities - Schedu

Investment Securities - Schedule of Investment Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities Available-for-Sale
Amortized Cost	$ 1,028,883	$ 1,097,645
Gross Unrealized/Unrecognized Holding Gains	453	4,645
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	25,915	10,409
Estimated Fair Value	1,003,421	1,091,881
Debt Securities Held-to-Maturity
Debt securities held-to-maturity, at amortized cost (fair value of $351,422 and $363,779 at December 31, 2018 and 2017, respectively)	351,808	357,197
Gross Unrealized/Unrecognized Holding Gains	3,289	7,333
Gross Unrealized/Unrecognized Holding Losses	3,675	751
Estimated Fair Value	351,422	363,779
Obligations of U.S. Treasury and other U.S. Government sponsored entities
Debt Securities Available-for-Sale
Amortized Cost		245,000
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		2,280
Estimated Fair Value		242,720
Obligations of States and Political Subdivisions
Debt Securities Held-to-Maturity
Debt securities held-to-maturity, at amortized cost (fair value of $351,422 and $363,779 at December 31, 2018 and 2017, respectively)	305,278	300,412
Gross Unrealized/Unrecognized Holding Gains	3,202	6,575
Gross Unrealized/Unrecognized Holding Losses	2,672	713
Estimated Fair Value	305,808	306,274
U.S. Government sponsored entity asset-backed securities
Debt Securities Available-for-Sale
Amortized Cost	1,028,883	852,645
Gross Unrealized/Unrecognized Holding Gains	453	4,645
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	25,915	8,129
Estimated Fair Value	1,003,421	849,161
Debt Securities Held-to-Maturity
Debt securities held-to-maturity, at amortized cost (fair value of $351,422 and $363,779 at December 31, 2018 and 2017, respectively)	46,530	56,785
Gross Unrealized/Unrecognized Holding Gains	87	758
Gross Unrealized/Unrecognized Holding Losses	1,003	38
Estimated Fair Value	$ 45,614	$ 57,505

Investment Securities - Sche_2

Investment Securities - Schedule of Unrealized Loss on Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]
Less than 12 Months	$ 506,280	$ 261,855
12 Months or Longer	449,569	536,586
Total	955,849	798,441
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months	5,998	2,856
12 Months or Longer	19,917	7,553
Total	25,915	10,409
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 Months	124,616	33,975
12 Months or Longer	77,654	45,498
Total	202,270	79,473
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months	1,933	232
12 Months or Longer	1,742	519
Total	3,675	751
Obligations of U.S. Treasury and other U.S. Government sponsored entities
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]
Less than 12 Months		24,931
12 Months or Longer		217,789
Total		242,720
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months		70
12 Months or Longer		2,210
Total		2,280
U.S. Government sponsored entity asset-backed securities
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract]
Less than 12 Months	506,280	236,924
12 Months or Longer	449,569	318,797
Total	955,849	555,721
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months	5,998	2,786
12 Months or Longer	19,917	5,343
Total	25,915	8,129
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 Months	32,656	7,331
12 Months or Longer	6,931
Total	39,587	7,331
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months	838	38
12 Months or Longer	165
Total	1,003	38
Obligations of States and Political Subdivisions
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than 12 Months	91,960	26,644
12 Months or Longer	70,723	45,498
Total	162,683	72,142
Held-to-maturity Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]
Less than 12 Months	1,095	194
12 Months or Longer	1,577	519
Total	$ 2,672	$ 713

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, 2018	Dec. 31, 2017
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract]
Amortized Cost	$ 1,028,883	$ 1,097,645
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Estimated Fair Value	1,003,421	1,091,881
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]
U.S. Government sponsored entities’ asset-backed securities	351,808	357,197
Fair value of securities held-to-maturity	351,422	363,779
Obligations of U.S. Treasury and other U.S. Government sponsored entities
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract]
Amortized Cost		245,000
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Estimated Fair Value		242,720
Obligations of States and Political Subdivisions
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	4,036
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	$ 3,987
held to maturity securities weighted avg yield yrs 5-10	3.04%
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost	$ 301,242
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	$ 301,821
Debt Securities, Held-to-maturity, Maturity, after 10 Years, Weighted Average Yield	3.69%
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]
U.S. Government sponsored entities’ asset-backed securities	$ 305,278	300,412
Fair value of securities held-to-maturity	305,808	306,274
U.S. Government sponsored entity asset-backed securities
Available-for-sale Securities, Debt Maturities, Amortized Cost [Abstract]
Amortized Cost	1,028,883	852,645
Available-for-sale Securities, Debt Maturities, Estimated Fair Value [Abstract]
Estimated Fair Value	$ 1,003,421	849,161
Available for Sale Securities Weighted Avg Yield	2.35%
Held-to-maturity Securities, Debt Maturities, Amortized Cost [Abstract]
U.S. Government sponsored entities’ asset-backed securities	$ 46,530	56,785
Fair value of securities held-to-maturity	$ 45,614	$ 57,505
Held-to-maturity Securities, Debt Maturities, Estimated Fair Value [Abstract]
Held to Maturity Securities weighted avg yield	2.83%

Loans - Narrative (Details)

Loans - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jul. 01, 2018
Financing Receivable, Recorded Investment [Line Items]
Business Combination, Acquired Receivable, Fair Value	$ 272,753,000
Business Combination, Acquired Receivables, Gross Contractual Amount	277,919,000			$ 277,900,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	272,753,000			272,753,000
Business Combination, Acquired Receivables, Estimated Uncollectible	0
Recorded Investment	1,319,000	$ 1,235,000	$ 3,798,000
Loans and Leases Receivable, Deferred Income	12,500,000	12,200,000
Net accretion of purchase accounting adjustments	(793,000)	0	0
Deposit Liabilities Reclassified as Loans Receivable	2,300,000	1,900,000
Troubled Debt Restructuring, Classification removed	2,400,000	500,000
Partial charge-offs on impaired loans	11,246,000	10,040,000
Allowance for loans individually evaluated for impairment	2,273,000	684,000
Recorded investment, related to loans	14,000,000	3,500,000
Loans 90 days past due and still accruing	2,302,000	1,845,000
financing receivable non accrual current	50,700,000	56,100,000
TDRs included in nonaccrual loan totals	24,600,000	38,500,000
Nonaccrual TDRs considered current	19,200,000	32,400,000
TDRs included in accruing loan totals	15,200,000	20,200,000
Loans and Leases Receivable, Impaired, Commitment to Lend	300,000	1,300,000
Specific reserves related to troubled debt restructuring	1,200,000	500,000
Additional specific reserves related to troubled debt restructuring	200,000	300,000	1,000,000
Modified substandard commercial loans, total recorded investment	368,000	106,000
Modified substandard consumer loans total recorded investment	20,900,000	8,900,000
Nonaccrual loans not classified as TDRs at prior fiscal year end	500,000	1,800,000	9,400,000
Loans receivable
Financing Receivable, Recorded Investment [Line Items]
Net accretion of purchase accounting adjustments	4,400,000
Consumer
Financing Receivable, Recorded Investment [Line Items]
Allowance for loans individually evaluated for impairment	0	0
Loans 90 days past due and still accruing	1,115,000	1,256,000
Executive officers and directors
Financing Receivable, Recorded Investment [Line Items]
Loans due from related party	35,900,000	42,100,000
New loan made to related party	1,400,000	1,600,000
Repayment of loans due from related party	11,500,000	11,400,000
Increase (Decrease) in Customer Advances	4,900,000	11,400,000
Accruing
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	86,000	180,000	111,000
Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	1,200,000	1,100,000	$ 3,700,000
Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment [Line Items]
Partial charge-offs on impaired loans	8,800,000	7,900,000
Financing Receivable With Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment [Line Items]
Partial charge-offs on impaired loans	2,400,000	2,100,000
Loans receivable | Executive officers and directors
Financing Receivable, Recorded Investment [Line Items]
Loans due from related party	25,900,000	$ 31,100,000
Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable, Recorded Investment [Line Items]
Business Combination, Acquired Receivable, Fair Value	4,400,000			4,900,000
Business Combination, Acquired Receivables, Gross Contractual Amount	$ 4,600,000			$ 5,100,000

Loans - Composition of Loan Po

Loans - Composition of Loan Portfolio By Class of Loan (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		$ 14,000	$ 3,500
Impaired Financing Receivable, Related Allowance		2,273	684
Impaired Financing Receivable, Unpaid Principal Balance		59,381	66,585
Recorded investment		48,144	56,564	$ 70,426
Loan Balance		5,692,132	5,372,483
Accrued Interest Receivable		17,666	16,659
Recorded Investment		5,709,798	5,389,142
Net accretion of purchase accounting adjustments		(793)	0	0
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		11,407	3,335
Impaired Financing Receivable, Related Allowance		2,169	681
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		13,736	5,394
Recorded investment		15,120	18,039	20,624
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		8,999	19,899
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		3,713	14,704
Loan Balance	[1]	1,072,786	1,053,453
Accrued Interest Receivable	[1]	4,603	4,413
Recorded Investment	[1]	1,077,389	1,057,866
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		2,213	82
Impaired Financing Receivable, Related Allowance		86	2
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		2,255	137
Recorded investment		28,426	18,142	24,474
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		26,663	18,974
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		26,213	18,060
Loan Balance	[1]	1,283,045	1,167,607
Accrued Interest Receivable	[1]	4,750	4,283
Recorded Investment	[1]	1,287,795	1,171,890
Construction real estate
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		248,274	181,470
Recorded Investment		249,233	182,017
Commercial
Financing Receivable, Recorded Investment [Line Items]
Recorded investment		1,866	1,324	2,226
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		4,679	2,788
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		1,866	1,324
Loan Balance		175,300	125,389
Accrued Interest Receivable		801	401
Recorded Investment		176,101	125,790
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		70,541	52,203
Accrued Interest Receivable		151	133
Recorded Investment		70,692	52,336
Installment
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		2,433	3,878
Accrued Interest Receivable		7	13
Recorded Investment		2,440	3,891
Commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		358	47
Impaired Financing Receivable, Related Allowance		18	1
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance		358	47
Recorded investment		2,732	19,059	$ 23,102
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance		2,691	19,346
Impaired Financing Receivable, with No Related Allowance, Recorded Investment		2,374	19,012
Loan Balance		429,730	393,094
Accrued Interest Receivable		1,150	1,029
Recorded Investment		430,880	394,123
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		1,134,278	1,110,426
Accrued Interest Receivable		1,227	1,516
Recorded Investment		1,135,505	1,111,942
HELOC
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		215,283	203,178
Accrued Interest Receivable		1,159	974
Recorded Investment		216,442	204,152
Installment
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		14,327	18,526
Accrued Interest Receivable		36	53
Recorded Investment		14,363	18,579
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		1,292,136	1,241,736
Accrued Interest Receivable		3,756	3,808
Recorded Investment		1,295,892	1,245,544
Leases
Financing Receivable, Recorded Investment [Line Items]
Loan Balance		2,273	2,993
Accrued Interest Receivable		26	36
Recorded Investment		$ 2,299	$ 3,029
[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, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 48,144	$ 56,564	$ 70,426
Nonaccrual Loans	67,954	72,056
Accruing TDRs	15,222	20,177
Loans Past Due 90 Days or More and Accruing	2,302	1,845
Total Nonperforming Loans	85,478	94,078
Impaired Financing Receivable, Average Recorded Investment	51,041	67,070	79,496
Impaired Financing Receivable, Interest Income, Cash Basis Method	1,890	2,708	4,777
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	15,120	18,039	20,624
Nonaccrual Loans	14,998	16,773
Accruing TDRs	196	1,291
Loans Past Due 90 Days or More and Accruing	10	0
Total Nonperforming Loans	15,204	18,064
Impaired Financing Receivable, Average Recorded Investment	21,000	23,154	26,821
Impaired Financing Receivable, Interest Income, Cash Basis Method	695	963	885
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	28,426	18,142	24,474
Nonaccrual Loans	25,566	12,979
Accruing TDRs	2,860	5,163
Loans Past Due 90 Days or More and Accruing	0	0
Total Nonperforming Loans	28,426	18,142
Impaired Financing Receivable, Average Recorded Investment	23,024	21,692	22,828
Impaired Financing Receivable, Interest Income, Cash Basis Method	1,047	903	884
Commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	1,866	1,324	2,226
Nonaccrual Loans	1,866	986
Accruing TDRs	0	338
Loans Past Due 90 Days or More and Accruing	0	0
Total Nonperforming Loans	1,866	1,324
Impaired Financing Receivable, Average Recorded Investment	1,709	1,729	5,503
Impaired Financing Receivable, Interest Income, Cash Basis Method	34	64	66
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	0	8
Accruing TDRs	15	92
Loans Past Due 90 Days or More and Accruing	20	0
Total Nonperforming Loans	35	100
Installment
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	19	52
Accruing TDRs	9	0
Loans Past Due 90 Days or More and Accruing	0	0
Total Nonperforming Loans	28	52
Commercial
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment	2,732	19,059	23,102
Nonaccrual Loans	2,610	18,835
Accruing TDRs	122	224
Loans Past Due 90 Days or More and Accruing	0	0
Total Nonperforming Loans	2,732	19,059
Impaired Financing Receivable, Average Recorded Investment	5,308	20,490	24,341
Impaired Financing Receivable, Interest Income, Cash Basis Method	114	778	2,942
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	16,892	16,841
Accruing TDRs	9,100	10,766
Loans Past Due 90 Days or More and Accruing	1,124	568
Total Nonperforming Loans	27,116	28,175
HELOC
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	2,158	1,593
Accruing TDRs	1,028	1,025
Loans Past Due 90 Days or More and Accruing	9	14
Total Nonperforming Loans	3,195	2,632
Installment
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	468	586
Accruing TDRs	1,049	616
Loans Past Due 90 Days or More and Accruing	24	7
Total Nonperforming Loans	1,541	1,209
Consumer
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual Loans	3,377	3,403
Accruing TDRs	843	662
Loans Past Due 90 Days or More and Accruing	1,115	1,256
Total Nonperforming Loans	$ 5,335	5,321
Impaired Financing Receivable, Average Recorded Investment		$ 5	$ 3

Loans - Loans Individually and

Loans - Loans Individually and Collectively Evaluated for Impairment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	$ 83,176	$ 92,233
Loans individually evaluated for impairment	48,144	56,564
Loans collectively evaluated for impairment	35,032	35,669
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	15,194	18,064
Loans individually evaluated for impairment	15,120	18,039
Loans collectively evaluated for impairment	74	25
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	28,426	18,142
Loans individually evaluated for impairment	28,426	18,142
Loans collectively evaluated for impairment	0	0
Commercial
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	1,866	1,324
Loans individually evaluated for impairment	1,866	1,324
Loans collectively evaluated for impairment	0	0
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	15	100
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	15	100
Installment
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	28	52
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	28	52
Commercial
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	2,732	19,059
Loans individually evaluated for impairment	2,732	19,059
Loans collectively evaluated for impairment	0	0
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	25,992	27,607
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	25,992	27,607
HELOC
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	3,186	2,618
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	3,186	2,618
Installment
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	1,517	1,202
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	1,517	1,202
Consumer
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual and accruing TDRs	4,220	4,065
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	$ 4,220	$ 4,065

Loans - Loans Individually Eva

Loans - Loans Individually Evaluated for Impairment by Class of Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	$ 59,381	$ 66,585
Recorded investment	48,144	56,564	$ 70,426
Allowance for loan losses allocated	2,273	684
Impaired Financing Receivable, Average Recorded Investment	51,041	67,070	79,496
Impaired Financing Receivable, Interest Income, Cash Basis Method	1,890	2,708	4,777
Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	1,866	1,324	2,226
Impaired Financing Receivable, Average Recorded Investment	1,709	1,729	5,503
Impaired Financing Receivable, Interest Income, Cash Basis Method	34	64	66
Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	2,732	19,059	23,102
Allowance for loan losses allocated	18	1
Impaired Financing Receivable, Average Recorded Investment	5,308	20,490	24,341
Impaired Financing Receivable, Interest Income, Cash Basis Method	114	778	2,942
Commercial, financial and agricultural
Financing Receivable, Impaired [Line Items]
Recorded investment	15,120	18,039	20,624
Allowance for loan losses allocated	2,169	681
Impaired Financing Receivable, Average Recorded Investment	21,000	23,154	26,821
Impaired Financing Receivable, Interest Income, Cash Basis Method	695	963	885
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded investment	28,426	18,142	24,474
Allowance for loan losses allocated	86	2
Impaired Financing Receivable, Average Recorded Investment	23,024	21,692	22,828
Impaired Financing Receivable, Interest Income, Cash Basis Method	$ 1,047	903	884
Consumer
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Average Recorded Investment		$ 5	$ 3

Loans - Aging of Recorded Inve

Loans - Aging of Recorded Investment in Past Due Loans (Details) - USD ($) $ in Thousands		Dec. 31, 2018		Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		$ 29,919		$ 25,241
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)		19,602	[1]	17,776	[2]
Total past due		49,521		43,017
Total current (2)		5,660,277		5,346,125
Recorded Investment		5,709,798		5,389,142
Installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		155		239
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)		274	[1]	253	[2]
Total past due		429		492
Total current (2)		13,934		18,087
Recorded Investment		14,363		18,579
HELOC
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		620		616
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)		907	[1]	876	[2]
Total past due		1,527		1,492
Total current (2)		214,915		202,660
Recorded Investment		216,442		204,152
Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		13,210		11,515
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)		8,553	[1]	9,232	[2]
Total past due		21,763		20,747
Total current (2)		1,113,742		1,091,195
Recorded Investment		1,135,505		1,111,942
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		683		16
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)		1,104	[1]	1,586	[2]
Total past due		1,787		1,602
Total current (2)		429,093		392,521
Recorded Investment		430,880		394,123
Installment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		28		54
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)		19	[1]	19	[2]
Total past due		47		73
Total current (2)		2,393		3,818
Recorded Investment		2,440		3,891
Mortgage
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		133		256
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)	[1]	20
Total past due		153		256
Total current (2)		70,539		52,080
Recorded Investment		70,692		52,336
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days				29
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)	[1]	1,635
Total past due		1,635		29
Total current (2)		174,466		125,761
Recorded Investment		176,101		125,790
Commercial, financial and agricultural
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		4,786		145
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)		1,375	[1]	1,043	[2]
Total past due		6,161		1,188
Total current (2)		1,071,228		1,056,678
Recorded Investment	[3]	1,077,389		1,057,866
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		780		856
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)		3,584	[1]	2,360	[2]
Total past due		4,364		3,216
Total current (2)		1,283,431		1,168,674
Recorded Investment	[3]	1,287,795		1,171,890
Construction real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment		249,233		182,017
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		9,524		11,515
Past due, nonaccrual loans and loans past due 90 days or more and accruing (1)		2,131	[1]	2,407	[2]
Total past due		11,655		13,922
Total current (2)		1,284,237		1,231,622
Recorded Investment		1,295,892		1,245,544
Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total current (2)		2,299		3,029
Recorded Investment		$ 2,299		$ 3,029
[1]	(1) Includes an aggregate of $2.3 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans.(2) Includes an aggregate of $50.7 million of nonaccrual loans which are current in regards to contractual principal and interest payments.
[2]	(1) Includes an aggregate of $1.8 million of loans past due 90 days or more and accruing. The remaining are past due, nonaccrual loans.(2) Includes an aggregate of $56.1 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 - 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, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Recorded investment	$ 48,144	$ 56,564	$ 70,426
Average recorded investment	51,041	67,070	79,496
Interest income recognized	1,890	2,708	4,777
Commercial, financial and agricultural
Financing Receivable, Impaired [Line Items]
Recorded investment	15,120	18,039	20,624
Average recorded investment	21,000	23,154	26,821
Interest income recognized	695	963	885
Commercial real estate
Financing Receivable, Impaired [Line Items]
Recorded investment	28,426	18,142	24,474
Average recorded investment	23,024	21,692	22,828
Interest income recognized	1,047	903	884
Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	1,866	1,324	2,226
Average recorded investment	1,709	1,729	5,503
Interest income recognized	34	64	66
Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	2,732	19,059	23,102
Average recorded investment	5,308	20,490	24,341
Interest income recognized	$ 114	778	2,942
Consumer
Financing Receivable, Impaired [Line Items]
Average recorded investment		$ 5	$ 3

Loans - Recorded Investment by

Loans - Recorded Investment by Loan Grade (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 5,692,132	$ 5,372,483	$ 5,271,857
Five Rated [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total loans	11,509	17,272
Five Rated [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,707	5,322
Five Rated [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,560	278
Five Rated [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	272	216
Five Rated [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	16,048	23,088
Six Rated [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total loans	444	153
Six Rated [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans		457
Six Rated [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	41	1
Six Rated [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	485	611
Impaired [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total loans	15,194	18,064
Impaired [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	28,426	18,142
Impaired [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,866	1,324
Impaired [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,732	19,059
Impaired [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	48,218	56,589
Purchased credit impaired [Member] | Commercial Financial Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	148
Purchased credit impaired [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,059
Purchased credit impaired [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	503
Purchased credit impaired [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	251
Purchased credit impaired [Member] | Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans	0	0
Purchased credit impaired [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	3,961
Pass [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,050,094	1,022,377
Pass [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,253,603	1,147,969
Pass [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	172,172	124,188
Pass [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	427,584	374,847
Pass [Member] | Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,299	3,029
Pass [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,905,752	2,672,410
Recorded Investment [Member] | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,077,389	1,057,866
Recorded Investment [Member] | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans	1,287,795	1,171,890
Recorded Investment [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	176,101	125,790
Recorded Investment [Member] | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total loans	430,880	394,123
Recorded Investment [Member] | Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans	2,299	3,029
Recorded Investment [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans	$ 2,974,464	$ 2,752,698

Loans - TDR Number of Contract

Loans - TDR Number of Contracts Modified And Recorded Investment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)contracts	Dec. 31, 2017USD ($)contracts	Dec. 31, 2016USD ($)contracts
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	392	426	405
Total Recorded Investment Modified as TDRs During Period	$ 9,191	$ 10,125	$ 21,258
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	21	29	32
Total Recorded Investment Modified as TDRs During Period	$ 857	$ 3,715	$ 8,641
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	17	9	14
Total Recorded Investment Modified as TDRs During Period	$ 3,586	$ 1,363	$ 6,381
Commercial
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	1	0	2
Total Recorded Investment Modified as TDRs During Period			$ 1,143
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	1	0
Total Recorded Investment Modified as TDRs During Period		$ 8
Installment
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	2	0	1
Total Recorded Investment Modified as TDRs During Period	$ 10
Commercial
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	3	15	11
Total Recorded Investment Modified as TDRs During Period	$ 417	$ 630	$ 1,122
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	25	33	34
Total Recorded Investment Modified as TDRs During Period	$ 1,696	$ 2,247	$ 2,406
HELOC
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	21	19	13
Total Recorded Investment Modified as TDRs During Period	$ 644	$ 576	$ 282
Installment
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	19	11	5
Total Recorded Investment Modified as TDRs During Period	$ 528	$ 294	$ 105
Consumer
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	283	309	293
Total Recorded Investment Modified as TDRs During Period	$ 1,453	$ 1,292	$ 1,178
Accruing
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	2,569	3,923	4,628
Accruing | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	28	945	191
Accruing | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	414	1,050	3,844
Accruing | Mortgage
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	0	0	0
Accruing | Installment
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	10	0	0
Accruing | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	54	144	89
Accruing | Mortgage
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	842	888	114
Accruing | HELOC
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	558	474	104
Accruing | Installment
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	459	251	102
Accruing | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	204	171	184
Nonaccrual
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	6,622	6,202	16,630
Nonaccrual | Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	829	2,770	8,450
Nonaccrual | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	3,172	313	2,537
Nonaccrual | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period			1,143
Nonaccrual | Mortgage
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period		8
Nonaccrual | Commercial
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	363	486	1,033
Nonaccrual | Mortgage
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	854	1,359	2,292
Nonaccrual | HELOC
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	86	102	178
Nonaccrual | Installment
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	69	43	3
Nonaccrual | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment Modified as TDRs During Period	$ 1,249	$ 1,121	$ 994

Loans - Recorded Investment _2

Loans - Recorded Investment in Financing Receivable Modified as TDR Within 12 Month (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)contracts	Dec. 31, 2017USD ($)contracts	Dec. 31, 2016USD ($)contracts
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	73	64	97
Recorded Investment | $	$ 1,319	$ 1,235	$ 3,798
Commercial, financial and agricultural
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	3	0	7
Recorded Investment | $	$ 104		$ 419
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	0	2	5
Recorded Investment | $		$ 82	$ 843
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	0	2	7
Recorded Investment | $		$ 117	$ 848
Mortgage
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	8	6	15
Recorded Investment | $	$ 518	$ 467	$ 1,201
HELOC
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	2	4	0
Recorded Investment | $	$ 32	$ 194
Installment
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	1	0	1
Recorded Investment | $	$ 29		$ 3
Leases
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	59	50	62
Recorded Investment | $	$ 636	$ 375	$ 484
Leases
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts	0	0	0
Recorded Investment | $	$ 0

Loans Accretable discount for l

Loans Accretable discount for loans acquired with deteriorated credit quality (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield	$ 144	$ 0	$ 0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Additions	176	0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Reclassifications from Nonaccretable Difference	0	0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Disposals of Loans	16	0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Accretion	$ 16	$ 0

Allowance for Loan Losses - Al

Allowance for Loan Losses - Allowance Calculation at the Segment Level and Adjusted Beginning Balance for the Allowance for Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loan and Lease Losses, Reserve Estimate Methodology, Historical Loss Period Factor	108 months	96 months
Beginning balance	$ 49,988	$ 50,624	$ 56,494
Charge-offs	13,552	19,403	20,799
Recoveries	(7,131)	(10,210)	(20,030)
Net charge-offs (recoveries)	6,421	9,193	769
Provision (Recovery)	7,945	8,557	(5,101)
Ending balance	51,512	49,988	50,624
Commercial, financial and agricultural
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	15,022	13,434	13,694
Charge-offs	2,796	6,017	5,786
Recoveries	(1,221)	(809)	(1,259)
Net charge-offs (recoveries)	1,575	5,208	4,527
Provision (Recovery)	3,330	6,796	4,267
Ending balance	16,777	15,022	13,434
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	9,601	10,432	9,197
Charge-offs	281	1,798	412
Recoveries	(272)	(810)	(3,671)
Net charge-offs (recoveries)	9	988	(3,259)
Provision (Recovery)	176	157	(2,024)
Ending balance	9,768	9,601	10,432
Construction real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	4,430	5,247	8,564
Charge-offs	72	105	1,436
Recoveries	(712)	(2,124)	(8,559)
Net charge-offs (recoveries)	(640)	(2,019)	(7,123)
Provision (Recovery)	(607)	(2,836)	(10,440)
Ending balance	4,463	4,430	5,247
Residential real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	9,321	10,958	13,514
Charge-offs	441	1,208	3,014
Recoveries	(844)	(1,863)	(2,446)
Net charge-offs (recoveries)	(403)	(655)	568
Provision (Recovery)	(993)	(2,292)	(1,988)
Ending balance	8,731	9,321	10,958
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	11,614	10,553	11,524
Charge-offs	9,962	10,275	10,151
Recoveries	(4,078)	(4,603)	(4,094)
Net charge-offs (recoveries)	5,884	5,672	6,057
Provision (Recovery)	6,043	6,733	5,086
Ending balance	11,773	11,614	10,553
Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning balance	0	0	1
Charge-offs	0	0	0
Recoveries	(4)	(1)	(1)
Net charge-offs (recoveries)	(4)	(1)	(1)
Provision (Recovery)	(4)	(1)	(2)
Ending balance	$ 0	$ 0	$ 0

Allowance for Loan Losses - Co

Allowance for Loan Losses - Composition of the Allowance for Loan Losses (Details) - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans		$ 5,692,132,000	$ 5,372,483,000	$ 5,271,857,000
Loans and Leases Receivable, Allowance		51,512,000	49,988,000	50,624,000	$ 56,494,000
Ending allowance balance attributed to loans:
Individually evaluated for impairment		2,273,000	684,000
Collectively evaluated for impairment		49,239,000	49,304,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses		0
Total ending allowance balance		51,512,000	49,988,000
Loan balance:
Loans individually evaluated for impairment		48,135,000	56,545,000
Loans collectively evaluated for impairment		5,640,054,000	5,315,938,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance		3,943,000
Total ending loan balance		$ 5,692,132,000	$ 5,372,483,000
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment		4.72%	1.21%
Loans collectively evaluated for impairment		0.87%	0.93%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance		0.00%
Total		0.90%	0.93%
Recorded investment:
Loans individually evaluated for impairment		$ 48,144,000	$ 56,564,000
Loans collectively evaluated for impairment		5,657,693,000	5,332,578,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net		3,961,000
Recorded Investment		5,709,798,000	5,389,142,000
Financing Receivable, Allowance for Credit Losses, Write-downs		13,552,000	19,403,000	20,799,000
Financing Receivable, Allowance for Credit Losses, Recovery		(7,131,000)	(10,210,000)	(20,030,000)
Financing Receivables Allowance For Credit Losses Net Charge Offs		6,421,000	9,193,000	769,000
Provision for Loan, Lease, and Other Losses		7,945,000	8,557,000	(5,101,000)
Commercial, financial and agricultural
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance		16,777,000	15,022,000	13,434,000	13,694,000
Ending allowance balance attributed to loans:
Individually evaluated for impairment		2,169,000	681,000
Collectively evaluated for impairment		14,608,000	14,341,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses		0
Total ending allowance balance		16,777,000	15,022,000
Loan balance:
Loans individually evaluated for impairment		15,119,000	18,034,000
Loans collectively evaluated for impairment		1,057,520,000	1,035,419,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance		147,000
Total ending loan balance	[1]	$ 1,072,786,000	$ 1,053,453,000
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment		14.35%	3.78%
Loans collectively evaluated for impairment		1.38%	1.39%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance		0.00%
Total		1.56%	1.43%
Recorded investment:
Loans individually evaluated for impairment		$ 15,120,000	$ 18,039,000
Loans collectively evaluated for impairment		1,062,121,000	1,039,827,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net		148,000
Recorded Investment	[1]	1,077,389,000	1,057,866,000
Financing Receivable, Allowance for Credit Losses, Write-downs		2,796,000	6,017,000	5,786,000
Financing Receivable, Allowance for Credit Losses, Recovery		(1,221,000)	(809,000)	(1,259,000)
Financing Receivables Allowance For Credit Losses Net Charge Offs		1,575,000	5,208,000	4,527,000
Provision for Loan, Lease, and Other Losses		3,330,000	6,796,000	4,267,000
Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance		9,768,000	9,601,000	10,432,000	9,197,000
Ending allowance balance attributed to loans:
Individually evaluated for impairment		86,000	2,000
Collectively evaluated for impairment		9,682,000	9,599,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses		0
Total ending allowance balance		9,768,000	9,601,000
Loan balance:
Loans individually evaluated for impairment		28,418,000	18,131,000
Loans collectively evaluated for impairment		1,251,579,000	1,149,476,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance		3,048,000
Total ending loan balance	[1]	$ 1,283,045,000	$ 1,167,607,000
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment		0.30%	0.01%
Loans collectively evaluated for impairment		0.77%	0.84%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance		0.00%
Total		0.76%	0.82%
Recorded investment:
Loans individually evaluated for impairment		$ 28,426,000	$ 18,142,000
Loans collectively evaluated for impairment		1,256,310,000	1,153,748,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net		3,059,000
Recorded Investment	[1]	1,287,795,000	1,171,890,000
Financing Receivable, Allowance for Credit Losses, Write-downs		281,000	1,798,000	412,000
Financing Receivable, Allowance for Credit Losses, Recovery		(272,000)	(810,000)	(3,671,000)
Financing Receivables Allowance For Credit Losses Net Charge Offs		9,000	988,000	(3,259,000)
Provision for Loan, Lease, and Other Losses		176,000	157,000	(2,024,000)
Construction real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance		4,463,000	4,430,000	5,247,000	8,564,000
Ending allowance balance attributed to loans:
Individually evaluated for impairment		0	0
Collectively evaluated for impairment		4,463,000	4,430,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses		0
Total ending allowance balance		4,463,000	4,430,000
Loan balance:
Loans individually evaluated for impairment		1,866,000	1,322,000
Loans collectively evaluated for impairment		245,909,000	180,148,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance		499,000
Total ending loan balance		$ 248,274,000	$ 181,470,000
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment		0.00%	0.00%
Loans collectively evaluated for impairment		1.81%	2.46%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance		0.00%
Total		1.80%	2.44%
Recorded investment:
Loans individually evaluated for impairment		$ 1,866,000	$ 1,324,000
Loans collectively evaluated for impairment		246,864,000	180,693,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net		503,000
Recorded Investment		249,233,000	182,017,000
Financing Receivable, Allowance for Credit Losses, Write-downs		72,000	105,000	1,436,000
Financing Receivable, Allowance for Credit Losses, Recovery		(712,000)	(2,124,000)	(8,559,000)
Financing Receivables Allowance For Credit Losses Net Charge Offs		(640,000)	(2,019,000)	(7,123,000)
Provision for Loan, Lease, and Other Losses		(607,000)	(2,836,000)	(10,440,000)
Residential real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance		8,731,000	9,321,000	10,958,000	13,514,000
Ending allowance balance attributed to loans:
Individually evaluated for impairment		18,000	1,000
Collectively evaluated for impairment		8,713,000	9,320,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses		0
Total ending allowance balance		8,731,000	9,321,000
Loan balance:
Loans individually evaluated for impairment		2,732,000	19,058,000
Loans collectively evaluated for impairment		1,790,637,000	1,706,166,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance		249,000
Total ending loan balance		$ 1,793,618,000	$ 1,725,224,000
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment		0.66%	0.01%
Loans collectively evaluated for impairment		0.49%	0.55%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance		0.00%
Total		0.49%	0.54%
Recorded investment:
Loans individually evaluated for impairment		$ 2,732,000	$ 19,059,000
Loans collectively evaluated for impairment		1,794,207,000	1,709,737,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net		251,000
Recorded Investment		1,797,190,000	1,728,796,000
Financing Receivable, Allowance for Credit Losses, Write-downs		441,000	1,208,000	3,014,000
Financing Receivable, Allowance for Credit Losses, Recovery		(844,000)	(1,863,000)	(2,446,000)
Financing Receivables Allowance For Credit Losses Net Charge Offs		(403,000)	(655,000)	568,000
Provision for Loan, Lease, and Other Losses		(993,000)	(2,292,000)	(1,988,000)
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance		11,773,000	11,614,000	10,553,000	11,524,000
Ending allowance balance attributed to loans:
Individually evaluated for impairment		0	0
Collectively evaluated for impairment		11,773,000	11,614,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses		0
Total ending allowance balance		11,773,000	11,614,000
Loan balance:
Loans individually evaluated for impairment		0	0
Loans collectively evaluated for impairment		1,292,136,000	1,241,736,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance		0
Total ending loan balance		$ 1,292,136,000	$ 1,241,736,000
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment		0.00%	0.00%
Loans collectively evaluated for impairment		0.91%	0.94%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance		0.00%
Total		0.91%	0.94%
Recorded investment:
Loans individually evaluated for impairment		$ 0	$ 0
Loans collectively evaluated for impairment		1,295,892,000	1,245,544,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net		0
Recorded Investment		1,295,892,000	1,245,544,000
Financing Receivable, Allowance for Credit Losses, Write-downs		9,962,000	10,275,000	10,151,000
Financing Receivable, Allowance for Credit Losses, Recovery		(4,078,000)	(4,603,000)	(4,094,000)
Financing Receivables Allowance For Credit Losses Net Charge Offs		5,884,000	5,672,000	6,057,000
Provision for Loan, Lease, and Other Losses		6,043,000	6,733,000	5,086,000
Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance		0	0	0	$ 1,000
Ending allowance balance attributed to loans:
Individually evaluated for impairment		0	0
Collectively evaluated for impairment		0	0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance for Loan Losses		0
Total ending allowance balance		0	0
Loan balance:
Loans individually evaluated for impairment		0	0
Loans collectively evaluated for impairment		2,273,000	2,993,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance		0
Total ending loan balance		$ 2,273,000	$ 2,993,000
Allowance for loan losses as a percentage of loan balance:
Loans individually evaluated for impairment		0.00%	0.00%
Loans collectively evaluated for impairment		0.00%	0.00%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance		0.00%
Total		0.00%	0.00%
Recorded investment:
Loans individually evaluated for impairment		$ 0	$ 0
Loans collectively evaluated for impairment		2,299,000	3,029,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net		0
Recorded Investment		2,299,000	3,029,000
Financing Receivable, Allowance for Credit Losses, Write-downs		0	0	0
Financing Receivable, Allowance for Credit Losses, Recovery		(4,000)	(1,000)	(1,000)
Financing Receivables Allowance For Credit Losses Net Charge Offs		(4,000)	(1,000)	(1,000)
Provision for Loan, Lease, and Other Losses		(4,000)	(1,000)	$ (2,000)
Purchased credit impaired [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans		3,961,000
Purchased credit impaired [Member] | Commercial real estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans		3,059,000
Purchased credit impaired [Member] | Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans		0	$ 0
Purchased credit impaired [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans		475,000
Ending allowance balance attributed to loans:
Individually evaluated for impairment		$ 0
[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.

Goodwill and Other Intangible_2

Goodwill and Other Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill	$ 112,739	$ 72,334
Finite-Lived Intangible Assets, Gross	6,249
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	1,234
Finite-Lived Intangible Assets, Amortization Expense, Year Two	1,149
Finite-Lived Intangible Assets, Amortization Expense, Year Three	869
Finite-Lived Intangible Assets, Amortization Expense, Year Four	629
Finite-Lived Intangible Assets, Amortization Expense, Year Five	521
Finite-Lived Intangible Assets, Accumulated Amortization	578
Indefinite-lived Intangible Assets (Excluding Goodwill)	1,300
Intangible Assets, Gross (Excluding Goodwill)	7,549
Other Intangible Assets, Net	6,971	0
Intangible Assets, Net (Including Goodwill)	119,710	72,334
Goodwill, Acquired During Period	40,405
Indefinite-lived Intangible Assets Acquired	7,549
Acquired goodwill and intangibles	47,954
Amortization of intangibles	578	0	$ 0
Trade Names [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	0
Core Deposits [Member]
Goodwill [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization	$ 578	$ 0

Loans Held for Sale (Details)

Loans Held for Sale (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Loans Held for Sale [Line Items]
Disposal Group, Including Discontinued Operation, Mortgage Loans	$ 4,158	$ 4,148
Loans Held-for-sale, Mortgages, Contractual Balance	4,098	4,092
Expected Gain (Loss) on Sale of Mortgage Loans	60	55
Loans held for sale - lower of cost or market		$ 0
Impaired [Member]
Loans Held for Sale [Line Items]
Loans held for sale - lower of cost or market	$ 174
Gain on sale of loans in secondary market			$ 2,826

Foreclosed and Repossessed As_3

Foreclosed and Repossessed Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Assets Repossessed or Foreclosed, or loans in process of foreclosure [Line Items]
Other Real Estate, Foreclosed Assets, and Repossessed Assets	$ 4,303	$ 14,190
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	1,108	4,852
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	2,359	7,888
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	836	1,450
Mortgage Loans in Process of Foreclosure, Amount	$ 2,346	$ 2,948

- Premises and Equipment (Detai

- Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$ 8,600	$ 8,644	$ 8,396
Rent expense	$ 2,434	$ 2,003	$ 2,117

Premises And Equipment - Major

Premises And Equipment - Major Categories of Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Premises and Equipment, Gross	$ 170,218	$ 156,386
Less accumulated depreciation	(110,447)	(100,485)
Premises and equipment, net	59,771	55,901
Land
Property, Plant and Equipment [Line Items]
Premises and Equipment, Gross	20,062	19,603
Buildings
Property, Plant and Equipment [Line Items]
Premises and Equipment, Gross	79,706	77,711
Equipment, furniture and fixtures
Property, Plant and Equipment [Line Items]
Premises and Equipment, Gross	65,659	55,799
Leasehold improvements
Property, Plant and Equipment [Line Items]
Premises and Equipment, Gross	$ 4,791	$ 3,273

Premises And Equipment - Schedu

Premises And Equipment - Schedule of Future Minimum Rental Payments Under Operating Leases (Details) $ in Thousands	Dec. 31, 2018USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2,019	$ 2,839
2,020	2,072
2,021	1,653
2,022	1,576
2,023	1,420
Thereafter	810
Total	$ 10,370

Investment in Qualified Affor_3

Investment in Qualified Affordable Housing (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investment in qualified affordable housing tax credits amortization	$ 7,322	$ 10,278	$ 7,300
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%	35.00%
Affordable Housing Tax Credits and Other Tax Benefits, Amount	$ 8,997	$ 9,438	$ 9,350
Affordable Housing Program Obligation	22,282	14,282
Qualified Affordable Housing [Domain]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity investments	$ 50,347	49,669
Change in Accounting Method Accounted for as Change in Estimate [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investment in qualified affordable housing tax credits amortization		$ 3,100

Deposits - Narrative (Details)

Deposits - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deposits [Abstract]
Deposits received from executive officers, directors, and their related interests	$ 19,700	$ 24,919
Time Deposits, $250,000 or more	$ 62,863	$ 38,539

Deposits - Summary of Noninter

Deposits - Summary of Noninterest Bearing and Interest Bearing Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deposits [Abstract]
Non-interest bearing	$ 1,804,881	$ 1,633,941
Interest bearing	4,455,979	4,183,385
Total deposits	$ 6,260,860	$ 5,817,326	$ 5,521,956

Deposits - Time Deposits (Deta

Deposits - Time Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deposits [Abstract]
Time Deposits, $250,000 or more	$ 62,863	$ 38,539
Time Deposits, Fiscal Year Maturity [Abstract]
2,019	670,674
2,020	248,938
2,021	55,873
2,022	47,190
2,023	20,405
After 5 years	97
Total	$ 1,043,177

Repurchase Agreement Borrowin_3

Repurchase Agreement Borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Available unpledged securities	$ 933,429	$ 975,013
Pledged Assets Separately Reported, Securities Pledged for Repurchase Agreements, at Fair Value	272,000	213,000
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	164,966	183,289
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	0	1,104
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	0
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	$ 164,966	$ 182,185

Short-Term Borrowings - Narrat

Short-Term Borrowings - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Pledged Financial Instruments, Not Separately Reported, Securities for Federal Home Loan Bank	$ 21,913	$ 24,900
FHLB Advances
Short-term Debt [Line Items]
Commercial real estate and residential mortgage loans pledged under blanket agreement	$ 1,646,226	$ 1,789,478

Short-Term Borrowings - Schedu

Short-Term Borrowings - Schedule of Short-Term Borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Securities sold under agreements to repurchase	$ 164,966	$ 183,289
FHLB advances	57,000	208,000
Total short-term borrowings	221,966	391,289
FHLB Advances
Short-term Debt [Line Items]
Total short-term borrowings	57,000	208,000
Highest month-end balance	256,000	208,000
Short-term Debt, Average Outstanding Amount	$ 44,553	$ 23,924
Weighted-average interest rate:
As of year-end	2.45%	1.64%
Paid during the year	1.95%	1.16%
Securities Sold under Agreements to Repurchase [Member]
Short-term Debt [Line Items]
Total short-term borrowings	$ 164,966	$ 183,289
Highest month-end balance	199,729	230,905
Short-term Debt, Average Outstanding Amount	$ 172,774	$ 205,269
Weighted-average interest rate:
As of year-end	0.49%	0.41%
Paid during the year	0.42%	0.35%

Long-Term Debt - Narrative (De

Long-Term Debt - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2014	Dec. 31, 2012	Nov. 30, 2012
Debt Instrument [Line Items]
Prepayment penalty on long-term debt	$ 0	$ 0	$ 5,554
Gains (Losses) on Restructuring of Debt			5,600	$ 3,200
Amortization of prepayment penalty on long-term debt	0	$ 5,719	6,176
Prepayment Penalty, Future Amortization Expense [Abstract]
Long-term Debt, Maturities, Repayments of Principal after Year Five	$ 0
FHLB Debt Prepaid			$ 50,000
FHLB Debt Prepaid Weighted Avg Rate			3150.00%
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%
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%

Long-Term Debt - Schedule of l

Long-Term Debt - Schedule of long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Long-term Debt, Fiscal Year Maturity [Abstract]
Long-term Debt, Maturities, Repayments of Principal after Year Five	$ 0
FHLB Advances
Debt Instrument [Line Items]
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	0
Long-term Debt, Fiscal Year Maturity [Abstract]
LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	100,000	$ 150,000
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	50,000	100,000
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	100,000	50,000
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	50,000	100,000
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	100,000	0
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearSix		100,000
Long-term Debt, Maturities, Repayments of Principal after Year Five	0
Thereafter		0
Total	$ 400,000	$ 500,000
Long-term Debt, Fiscal Year Maturity, Average Rate [Abstract] [Abstract]
LongTermDebtMaturitiesAverageRateInNextTwelveMonths	1.92%	2.04%
LongTermDebtMaturitiesAverageRateInYearTwo	2.04%	1.92%
LongTermDebtMaturitiesAverageRateInYearThree	1.96%	2.04%
LongTermDebtMaturitiesAverageRateInYearFour	3.01%	1.96%
LongTermDebtMaturitiesAverageRateInYearFive	3.40%	0.00%
LongTermDebtMaturitiesAverageRateInYearSix		3.40%
Long Term Debt Maturities Average Rate In After Year Five	0.00%
Thereafter		0.00%
Total	2.45%	2.27%

Subordinated Notes (Details)

Subordinated Notes (Details)	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Apr. 20, 2012USD ($)purchaser
Subordinated notes	$ 15,000,000	$ 15,000,000
Trust I
Preferred securities issued	15,000,000
Junior subordinated notes
Junior subordinated debt purchased by Trust I	$ 15,500,000
Trust preferred securities
Variable rate basis	three-month LIBOR plus 148 basis points
Basis spread on variable rate (percent)	1.48%
Subordinated debt | 7% Subordinated notes due April 20, 2022
Subordinated borrowing, number of purchasers | purchaser			56
Aggregate principal amount			$ 30,000,000
Interest rate	7.00%
Interest Expense, Debt		$ 140,000

Share-Based Compensation - Sha

Share-Based Compensation - Share-Based Compensation Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number	140,134
Treasury Stock Reissued Shares For Director Grants	11,650	11,150	9,950
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	$ 1,109	$ 1,240	$ 950
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	116,716	85,425
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(18,800)	(9,674)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(4,655)	(3,021)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease)	(2,320)	(1,802)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	152,631	116,716	85,425
Allocated Share-based Compensation Expense	$ 7,203
Allocated Share-based Compensation Expense	$ 3,954
Shares Paid for Tax Withholding for Share Based Compensation	5,879	3,293
Restricted Stock, Shares Issued Net of Shares for Tax Withholdings	12,921	6,381
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)	92,404
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	61,690	45,788	41,550
Allocated Share-based Compensation Expense		$ 2,701	$ 1,864
2017 Employees Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	48,053
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	750,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	689,773
2017 Non Employee Directors LTIP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	150,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	127,200
Common Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock Reissued Shares For Director Grants	11,650	11,150	9,950
Allocated Share-based Compensation Expense	$ 3,954	$ 2,701	$ 1,864
Expense to be paid next twelve months [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	3,580
Expense to be paid Year Two [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	2,390
Expense to be paid Year Three [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	1,010
Expense to be paid Year Four [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 223
Restricted Stock Units (RSUs) [Member] | 2017 Employees Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	13,637

Benefit Plans - Narrative (Det

Benefit Plans - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Nov. 17, 2009
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)		$ (16,413,000)	$ 21,773,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		4.60%	3.89%	4.58%
Defined Benefit Plan, Plan Assets, Contributions by Employer		$ 0	$ 15,000,000
Expected long-term rate of return on plan assets		7.00%
Accumulated benefit obligation for the pension plan		$ 104,900,000	$ 116,000,000
Common share purchased under pension plan, shares					115,800
Common share purchased under pension plan, value					$ 7,000,000
Common share purchased under pension plan, value per share					$ 60.45
Fair value, pension plan common shares held, shares		115,800	115,800
Fair value of common shares held by pension plan		$ 9,800,000	$ 12,000,000
Fair value of common shares held by pension plan, per share		$ 84.95	$ 104
Estimated net actuarial (loss) expected to be recognized in the next fiscal year		$ 1,882,000
Expected long-term return on plan assets		7.00%	7.00%	7.25%
Market value of pension plan assets		$ 177,100,000	$ 195,700,000
Defined Contribution Plan, Cost		3,000,000	1,300,000	$ 1,300,000
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		1,000,000	1,700,000	$ 1,500,000
Accrued benefit cost		10,300,000	9,900,000
Level 1
Defined Benefit Plan Disclosure [Line Items]
Equity investments		147,100,000	169,600,000
Level 2
Defined Benefit Plan Disclosure [Line Items]
Equity investments		30,000,000	26,100,000
Level 3
Defined Benefit Plan Disclosure [Line Items]
Equity investments		0	$ 0
Subsequent Event [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Market value of pension plan assets		$ 2,000,000

Benefit Plans - Plan Assets an

Benefit Plans - Plan Assets and Benefit Obligation Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Change in fair value of plan assets
Fair value at beginning of measurement period	$ 195,735	$ 167,047
Actual return on plan assets	(8,118)	21,573
Benefits paid	(10,540)	(7,885)
Fair value at end of measurement period	177,077	195,735	$ 167,047
Change in benefit obligation
Projected benefit obligation at beginning of measurement period	138,698	114,455
Service cost	6,547	5,270	5,055
Interest cost	5,236	5,085	4,869
Actuarial (gain) loss	(16,413)	21,773
Benefits paid	10,540	7,885
Projected benefit obligation at the end of measurement period	123,528	138,698	$ 114,455
Funded status at end of year (fair value of plan assets less benefit obligation)	53,549	57,037
Defined Benefit Plan, Plan Assets, Contributions by Employer	0	15,000
Defined Benefit Plan, Plan Assets, Benefits Paid	$ 10,540	$ 7,885

Benefit Plans - Asset Allocati

Benefit Plans - Asset Allocation for the Pension Plan by Asset Category (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 0	$ 15,000
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%
Equity securities
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual Plan Asset Allocations	82.00%	79.00%
Fixed income and cash equivalents
Defined Benefit Plan, Information about Plan Assets [Abstract]
Actual Plan Asset Allocations	18.00%	21.00%

Benefit Plans - Weighted Avera

Benefit Plans - Weighted Average Assumptions Used to Determine Benefit Obligations (Details)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate	4.60%	3.89%	4.58%
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%	4.00%	4.00%
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, 2018USD ($)
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Defined Benefit Plan Expected Future Benefit Payments Next Twelve Months	$ 8,428
Defined Benefit Plan Expected Future Benefit Payments Year Two	8,733
Defined Benefit Plan Expected Future Benefit Payments Year Three	9,787
Defined Benefit Plan Expected Future Benefit Payments Year Four	10,324
Defined Benefit Plan Expected Future Benefit Payments Year Five	9,698
Defined Benefit Plan Expected Future Benefit Payments Five Fiscal Years Thereafter	51,726
Total	$ 98,696

Benefit Plans - Balances of Ac

Benefit Plans - Balances of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Prior service cost	$ 0	$ 0
Net actuarial loss	(37,560)	(33,799)
Total	(37,560)	(33,799)
Deferred taxes	(7,888)	(7,098)
Tax Effect of Extraordinary Item, Gain (Loss)	0	3,175
Accumulated other comprehensive loss	$ (29,672)	$ (23,526)

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Components of net periodic benefit cost
Service cost	$ (6,547,000)	$ (5,270,000)	$ (5,055,000)
Interest cost	(5,236,000)	(5,085,000)	(4,869,000)
Expected return on plan assets	13,417,000	11,455,000	10,950,000
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	(1,361,000)	(576,000)	(773,000)
Net periodic benefit income	(273,000)	(524,000)	(253,000)
Other amounts recognized in other comprehensive (Loss)
Net (loss) gain	(5,122,000)	(11,698,000)	168,000
Amortization of net loss	1,361,000	576,000	773,000
Total recognized in other comprehensive income (loss)	(3,761,000)	(11,122,000)	941,000
Total recognized in net benefit income and other comprehensive income (loss)	$ (3,488,000)	$ (10,598,000)	$ 1,194,000

Benefit Plans - Weighted Ave_2

Benefit Plans - Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase
Expected long-term return on plan assets	7.00%	7.00%	7.25%
Discount rate	3.89%	4.58%	4.88%
Ages 30-39 [Member] [Member]
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase	6.00%	6.00%	6.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, 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%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	10.00%	10.00%	10.00%
Ages 40-49 [Domain]
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase	4.00%	4.00%	4.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase	4.00%	4.00%	3.00%
Ages 50 and over [Member]
Defined Benefit Plan Disclosure [Line Items]
Rate of compensation increase	3000.00%	3000.00%	3000.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, 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	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets, Operating Loss Carryforwards	$ 4,663	$ 0
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	35.00%	35.00%
Current Federal Tax Expense (Benefit)		$ 1,200
Investment in qualified affordable housing tax credits amortization	$ 7,322	10,278	$ 7,300
Other Information Pertaining to Income Taxes	1
Deferred tax assets:
Allowance for loan losses	$ 10,818	10,498
Accumulated other comprehensive loss – Pension plan	7,888	7,098
Accumulated other comprehensive loss – Unrealized losses on securities	5,347	946
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation	2,896	2,744
Deferred compensation	1,028	1,327
Net deferred loan fees	1,221	1,115
Deferred contract bonus	556	645
Nonvested equity-based compensation	1,567	1,069
Fixed assets	206	877
Deferred Tax Assets, Operating Loss Carryforwards	4,663	0
Other	824	1,230
Total deferred tax assets	37,014	27,549
Deferred tax liabilities:
Deferred investment income	6,120	6,120
Pension Plan	19,133	19,076
MSRs	2,137	2,034
Partnership adjustments	630	460
Deferred Tax Liabilities, Deferred Expense, Deferred Policy Acquisition Cost	769	166
Other	210	198
Total deferred tax liabilities	28,999	28,054
Net deferred tax asset (liability)		(505)
Deferred Tax Assets, Net	8,015
Change in Accounting Method Accounted for as Change in Estimate [Member]
Investment in qualified affordable housing tax credits amortization		$ 3,100
Domestic Tax Authority [Member]
Deferred Tax Assets, Operating Loss Carryforwards	19,400
Deferred tax assets:
Deferred Tax Assets, Operating Loss Carryforwards	19,400
State and Local Jurisdiction [Member]
Deferred Tax Assets, Operating Loss Carryforwards	19,300
Deferred tax assets:
Deferred Tax Assets, Operating Loss Carryforwards	$ 19,300

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Currently payable
Federal	$ 12,700	$ 20,660	$ 28,879
Current State and Local Tax Expense (Benefit)	352	0	0
Other Tax Expense (Benefit)	7,322	10,278	7,300
Deferred
Federal	481	3,289	581
Deferred State and Local Income Tax Expense (Benefit)	57	0	0
Total	$ 20,912	$ 34,227	$ 36,760

Income Taxes - Reconciliation

Income Taxes - Reconciliation of Federal Income Tax Expense (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments, Owned, Federal Income Tax Note [Line Items]
State and Local Income Tax Expense (Benefit), Continuing Operations	$ 409,000
Income Tax Examination, Penalties and Interest Expense	$ 79,500	$ 3,500	$ 1,500
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory federal corporate income tax rate	21.00%	35.00%	35.00%
Changes in rates resulting from:
Tax exempt interest income, net of disallowed interest	(1.80%)	(2.80%)	(1.30%)
Bank owned life insurance	(1.10%)	(1.40%)	(1.20%)
Investments in qualified affordable housing projects, net of tax benefits	(1.30%)	(1.90%)	(1.70%)
KSOP dividend deduction	(0.60%)	(1.00%)	(1.00%)
Impact of the Tax Cuts and Jobs Act (1)	0.00%	1.00%	0.00%
Non-taxable gain on NewDominion common stock	(0.60%)	0.00%	0.00%
Other	0.10%	(0.00%)	0.10%
Effective tax rate	15.90%	28.90%	29.90%
Deferred Tax Liabilities, Deferred Expense		$ 1,900,000

Income Taxes - Reconciliatio_2

Income Taxes - Reconciliation of the Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 1,122,000	$ 506,000	$ 482,000
Income Tax Examination, Penalties and Interest Expense	79,500	3,500	1,500
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
January 1 Balance	664,000	633,000	558,000
Additions based on tax positions related to the current year	10,000	117,000	117,000
Additions for tax positions of prior years	781,000	0	38,000
Reductions for tax positions of prior years	0	(9,000)	0
Reductions due to statute of limitations	(229,000)	(77,000)	(80,000)
December 31 Balance	1,226,000	664,000	633,000
Income Tax Examination, Penalties and Interest Accrued	$ 153,500	$ 74,000	$ 70,500

Other Comprehensive Income (L_3

Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax	$ 1,361	$ 576	$ 773
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax	1,361	576	773
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax	286	121	271
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(29,672)	(23,526)	(14,740)	$ (15,351)
Accumulated Other Comprehensive Income (Loss), Debt Securities, Available-for-sale, Adjustment, after Tax	(20,116)	(2,928)	(3,005)	(292)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(49,788)	(26,454)	(17,745)	$ (15,643)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(2,971)	(8,786)	611
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax	(15,562)	77	(2,713)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax	(4,046)	(9,241)	109
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Reclassification Adjustments, after Tax	(17,586)	1,261	(2,713)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(21,632)	(7,980)	(2,604)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax	1,075	455	502
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	3,099	(729)	502
Other Comprehensive Income (Loss), Net of Tax	(18,533)	(8,709)	(2,102)
Gain (Loss) on Sale of Investments	2,271	(1,821)	0
Other than Temporary Impairment Losses, Investments	0	0	0
Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, before Tax	2,562	(1,821)	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	538	(637)	0
Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2,024	(1,184)	0
Debt Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	2,024	(1,184)	0
Adjustments for New Accounting Pronouncement [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax		(23,526)
Accumulated Other Comprehensive Income (Loss), Debt Securities, Available-for-sale, Adjustment, after Tax		(3,923)
Accumulated Other Comprehensive Income (Loss), Net of Tax		(27,449)
Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		(3,806)
Other Comprehensive Income (Loss), Net of Tax	(18,533)	(8,709)	$ (2,102)
Accumulated Other Comprehensive (Loss) Income | Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		(3,175)
Accumulated Other Comprehensive (Loss) Income | Debt Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		(631)
Accumulated Other Comprehensive (Loss) Income | Accounting Standards Update 2016-01 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		$ (995)
Available-for-sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Gain (Loss) on Sale of Investments	$ 2,562

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Income (Loss) Available to Common Stockholders, Basic [Abstract]
Net income	$ 110,387	$ 84,242	$ 86,135
Denominator:
Weighted-average common shares outstanding	15,488,982	15,295,573	15,332,553
Effect of dilutive PBRSUs and TBRSUs	122,507	94,779	72,607
Earnings per common share:	15,611,489	15,390,352	15,405,160
Earnings per common share:
Basic earnings per common share	$ 7.13	$ 5.51	$ 5.62
Diluted earnings per common share	$ 7.07	$ 5.47	$ 5.59

Earnings Per Common Share - Na

Earnings Per Common Share - Narrative (Details) - shares	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Warrant or Right [Line Items]
Stock Issued During Period, Shares, Acquisitions	435,457
Weighted Average Number Diluted Shares Outstanding Adjustment		122,507	94,779	72,607
2017 Employees 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		48,053
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		61,690	45,788	41,550
Common Shares
Class of Warrant or Right [Line Items]
Stock Issued During Period, Shares, Acquisitions		435,457
Treasury Stock, Shares, Acquired		50,000	70,000	0
Restricted Stock Units (RSUs) [Member] | 2017 Employees 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		13,637

Dividend Restrictions (Details)

Dividend Restrictions (Details) $ in Millions	Dec. 31, 2018USD ($)
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]
Amount available for dividend distribution without prior approval from regulatory authority	$ 86.2

Financial Instruments With Of_3

Financial Instruments With Off-Balance Sheet Risk And Financial Instruments With Concentrations Of Credit Risk (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Unused Commitments to Extend Credit	$ 1,012,820	$ 893,205
Standby letters of credit	$ 13,334	$ 13,421

Loan Servicing - Narrative (De

Loan Servicing - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Transfers and Servicing of Financial Assets [Abstract]
Serviced sold mortgage loans	$ 1,389,000	$ 1,371,000	$ 1,330,000
Serviced sold mortgage loans with recourse	2,500	3,000	4,100
Mortgage loans sold with recourse, reserve	$ 60	$ 300
Mortgage servicing rights, discount rate	12.00%	13.00%
Minimum
Transfers and Servicing of Financial Assets [Abstract]
Mortgage servicing rights, constant prepayment speeds	4.80%	6.50%
Maximum
Transfers and Servicing of Financial Assets [Abstract]
Mortgage servicing rights, constant prepayment speeds	17.80%	17.10%
Mortgages [Member]
Servicing Assets at Fair Value [Line Items]
Servicing Asset at Amortized Cost, Fair Value	$ 10,971	$ 9,692
Bank Servicing [Member]
Transfers and Servicing of Financial Assets [Abstract]
Revenue from Contract with Customer, Including Assessed Tax	14,266	13,162	14,419
Real Estate Loan [Member] | Bank Servicing [Member]
Transfers and Servicing of Financial Assets [Abstract]
Revenue from Contract with Customer, Including Assessed Tax	$ 3,600	$ 3,500	$ 3,400

Loan Servicing - Activity for

Loan Servicing - Activity for MSRs And Related Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
MSRs:
Carrying amount, net, beginning of year	$ 9,688	$ 9,266	$ 9,008
Additions	1,591	1,941	2,286
Amortization	(1,499)	(1,624)	(1,835)
Change in valuation allowance	398	105	(193)
Carrying amount, net, end of year	10,178	9,688	9,266
Valuation allowance:
Beginning of year	630	735	542
Change in valuation allowance	(398)	(105)	193
End of year	$ 232	$ 630	$ 735

Fair Value - Narrative (Detail

Fair Value - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	$ 6,100,000	$ 7,200,000
Alternative Investment, income recognized	$ 1,403,000
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	$ 11,246,000	10,040,000
Allowance for loans individually evaluated for impairment	2,273,000	684,000
Book Value Of Impaired Loans Carried At Fair Value	6,503,000	3,577,000
Impaired loans carried at fair value	6,399,000	3,574,000
Impaired Financing Receivable, Related Allowance	2,273,000	684,000
Impaired Financing Receivable, carried at fair value, related expense	(400,000)	(1,600,000)	$ 900,000
MSR recorded at lower of cost or fair value	10,178,000	9,688,000	9,266,000	$ 9,008,000
Servicing Asset at Fair Value, Amount	1,200,000	7,300,000
Valuation allowance of MSR	232,000	630,000	735,000	$ 542,000
MSRs recorded at cost	9,000,000	2,400,000
Valuation allowance for impairment of recognized servicing assets, provisions (recoveries)	398,000	105,000	(193,000)
Other Real Estate, Foreclosed Assets, and Repossessed Assets	$ 4,303,000	$ 14,190,000
Percent of OREO held at fair value	85.00%	46.00%
Estimated fair value of other real estate owned (OREO)	$ 3,700,000	$ 6,500,000
OREO devaluations	491,000	458,000	$ 601,000
Other Repossessed Assets	3,954,000	5,510,000
Other Assets, Fair Value Disclosure	5,570,136,000	5,247,021,000
expense related to other repossessed assets	269,000	0
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	104,000	3,000
Fair Value Measured at Net Asset Value Per Share [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Alternative Investment	11,000,000	8,800,000
Accounting Standards Update 2016-01 [Member] | Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		1,200,000
Accounting Standards Update 2016-01 [Member] | Retained Earnings
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		$ 922,000
Commercial Portfolio Segment [Member] | Purchased credit impaired [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	$ 0

Fair Value - Assets and Liabil

Fair Value - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage Loans Held for Sale	$ 4,158	$ 4,148
Mortgage IRLCs	87	94
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	4,158	4,148
Mortgage IRLCs	87	94
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	4,158	4,148
Mortgage IRLCs	87	94
Recurring basis | Level 2
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage Loans Held for Sale	4,158	4,148
Mortgage IRLCs	87	94
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		242,720
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		242,720
Recurring basis | U.S. Government Sponsored Entities’ Asset-Backed Securities
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment Securities	1,003,421	849,161
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	1,003,421	849,161
Recurring basis | Equity securities
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment Securities	1,649	1,935
Recurring basis | Equity securities | Level 1
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment Securities	1,225	1,518
Recurring basis | Equity securities | Level 3
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment Securities	424	417
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 Value - Reconciliation of

Fair Value - Reconciliation of the Level 3 Inputs for Financial Instruments Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3		$ (346)
Total Gains (Losses)
Purchases, sales, issuances and settlements, other, net		33
Equity Securities | Recurring basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	$ 7
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	417	790
Total Gains (Losses)
Included in other income		6
Ending balance	424	417
Fair Value Swap | Recurring basis | Level 3
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	(226)	(226)
Total Gains (Losses)
Ending Balance	$ (226)	$ (226)

Fair Value - Assets and Liab_2

Fair Value - Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	$ 6,399	$ 3,574
Mortgage servicing rights	1,200	7,300
Other loans, net (3)	5,570,136	5,247,021
Level 3
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	6,399	3,574
Other loans, net (3)	5,570,136	5,247,021
Nonrecurring basis
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	6,399	3,574
Mortgage servicing rights	1,169	7,316
Other loans, net (3)	3,674	6,520
Nonrecurring basis | Level 1
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans, net (3)	0	0
Nonrecurring basis | Level 2
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Mortgage servicing rights	1,169	7,316
Other loans, net (3)	0	0
Nonrecurring basis | Level 3
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	6,399	3,574
Other loans, net (3)	3,674	6,520
Nonrecurring basis | Commercial real estate
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	4,059	2,735
Other loans, net (3)	2,295	2,295
Nonrecurring basis | Commercial real estate | Level 1
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans, net (3)	0	0
Nonrecurring basis | Commercial real estate | Level 2
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans, net (3)	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	4,059	2,735
Other loans, net (3)	2,295	2,295
Nonrecurring basis | Construction real estate
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans, net (3)	729	3,204
Nonrecurring basis | Construction real estate | Level 1
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans, net (3)	0	0
Nonrecurring basis | Construction real estate | Level 2
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans, net (3)	0	0
Nonrecurring basis | Construction real estate | Level 3
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans, net (3)	729	3,204
Nonrecurring basis | Commercial
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	1,635	127
Nonrecurring basis | Commercial | Level 3
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	1,635	127
Nonrecurring basis | Residential real estate
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Impaired loans carried at fair value	705	712
Other loans, net (3)	650	1,021
Nonrecurring basis | Residential real estate | Level 1
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans, net (3)	0	0
Nonrecurring basis | Residential real estate | Level 2
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans, net (3)	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	705	712
Other loans, net (3)	650	$ 1,021
Other Assets [Member] | Nonrecurring basis
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans, net (3)	3,464
Other Assets [Member] | Nonrecurring basis | Level 1
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans, net (3)	0
Other Assets [Member] | Nonrecurring basis | Level 2
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans, net (3)	0
Other Assets [Member] | Nonrecurring basis | Level 3
Fair Value, Assets And Liabilities Measured On Nonrecurring Basis [Line Items]
Other loans, net (3)	$ 3,464

Fair Value - Qualitative Infor

Fair Value - Qualitative Information About Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on a Non-recurring Basis (Details) $ in Thousands	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans carried at fair value	$ 6,399	$ 3,574
Other loans, net (3)	5,570,136	5,247,021
Nonrecurring basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans carried at fair value	6,399	3,574
Other loans, net (3)	3,674	6,520
Commercial real estate | Nonrecurring basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans carried at fair value	4,059	2,735
Other loans, net (3)	2,295	2,295
Commercial real estate | Nonrecurring basis | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans carried at fair value	4,059	2,735
Commercial | Nonrecurring basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans carried at fair value	1,635	127
Commercial | Nonrecurring basis | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans carried at fair value	1,635	127
Construction real estate | Nonrecurring basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other loans, net (3)	729	3,204
Residential real estate | Nonrecurring basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans carried at fair value	705	712
Other loans, net (3)	650	1,021
Residential real estate | Nonrecurring basis | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans carried at fair value	705	712
Other Real Estate Owned, Commercial [Member] | Nonrecurring basis | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other loans, net (3)	2,295	2,295
Other Real Estate Owned, Construction [Member] | Nonrecurring basis | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other loans, net (3)	729	3,204
Other Real Estate Owned, Residential [Member] | Nonrecurring basis | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other loans, net (3)	650	1,021
Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans carried at fair value	6,399	3,574
Other loans, net (3)	5,570,136	5,247,021
Fair Value, Inputs, Level 3 [Member] | Nonrecurring basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans carried at fair value	6,399	3,574
Other loans, net (3)	3,674	6,520
Fair Value, Inputs, Level 3 [Member] | Commercial real estate | Nonrecurring basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans carried at fair value	4,059	2,735
Other loans, net (3)	2,295	2,295
Fair Value, Inputs, Level 3 [Member] | Commercial | Nonrecurring basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans carried at fair value	1,635	127
Fair Value, Inputs, Level 3 [Member] | Construction real estate | Nonrecurring basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other loans, net (3)	729	3,204
Fair Value, Inputs, Level 3 [Member] | Residential real estate | Nonrecurring basis
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired loans carried at fair value	705	712
Other loans, net (3)	$ 650	$ 1,021
Measurement Input, Discount Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Construction real estate | Low | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Measurement Input		0.150
Measurement Input, Discount Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Construction real estate | High | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Measurement Input		0.150
Measurement Input, Discount Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Construction real estate | Weighted Average [Member] | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Measurement Input		0.150
Measurement input replacement cost [Member] | Fair Value, Inputs, Level 3 [Member] | Cost approach | Commercial real estate | Low | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loans Receivable, Measurement Input	0.042	0.901
Measurement input replacement cost [Member] | Fair Value, Inputs, Level 3 [Member] | Cost approach | Commercial real estate | High | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loans Receivable, Measurement Input	0.901	0.901
Measurement input replacement cost [Member] | Fair Value, Inputs, Level 3 [Member] | Cost approach | Commercial real estate | Weighted Average [Member] | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loans Receivable, Measurement Input	0.110	0.901
Measurement Input, Cap Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Income approach | Commercial real estate | Low | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loans Receivable, Measurement Input	0.095	0.090
Measurement Input, Cap Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Income approach | Commercial real estate | Low | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Measurement Input	0.130	0.130
Measurement Input, Cap Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Income approach | Commercial real estate | High | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loans Receivable, Measurement Input	0.108	0.110
Measurement Input, Cap Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Income approach | Commercial real estate | High | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Measurement Input	0.130	0.130
Measurement Input, Cap Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Income approach | Commercial real estate | Weighted Average [Member] | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loans Receivable, Measurement Input	0.106	0.099
Measurement Input, Cap Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Income approach | Commercial real estate | Weighted Average [Member] | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Measurement Input	0.130	0.130
Measurement Input, Cap Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Income approach | Residential real estate | Low | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loans Receivable, Measurement Input	0.105	0.105
Measurement Input, Cap Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Income approach | Residential real estate | High | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loans Receivable, Measurement Input	0.105	0.105
Measurement Input, Cap Rate [Member] | Fair Value, Inputs, Level 3 [Member] | Income approach | Residential real estate | Weighted Average [Member] | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loans Receivable, Measurement Input	0.105	0.105
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Commercial real estate | Low | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loans Receivable, Measurement Input	0	0
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Commercial real estate | Low | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Measurement Input	0.009	0
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Commercial real estate | High | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loans Receivable, Measurement Input	1.075	0.900
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Commercial real estate | High | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Measurement Input	0.684	0.684
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Commercial real estate | Weighted Average [Member] | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loans Receivable, Measurement Input	0.311	0.227
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Commercial real estate | Weighted Average [Member] | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Measurement Input	0.347	0.347
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Construction real estate | Low | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loans Receivable, Measurement Input	0.050	0
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Construction real estate | Low | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Measurement Input	0	0
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Construction real estate | High | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loans Receivable, Measurement Input	0.900	0.048
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Construction real estate | High | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Measurement Input	0.450	0.900
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Construction real estate | Weighted Average [Member] | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loans Receivable, Measurement Input	0.261	0.024
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Construction real estate | Weighted Average [Member] | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Measurement Input	0.217	0.245
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Residential real estate | Low | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loans Receivable, Measurement Input	0	0.003
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Residential real estate | Low | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Measurement Input	0.304	0.012
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Residential real estate | High | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loans Receivable, Measurement Input	0.400	0.330
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Residential real estate | High | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Measurement Input	0.546	0.797
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Residential real estate | Weighted Average [Member] | Loans receivable
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Impaired Loans Receivable, Measurement Input	0.132	0.125
Measurement Input, Comparability Adjustment [Member] | Fair Value, Inputs, Level 3 [Member] | Valuation, Market Approach [Member] | Residential real estate | Weighted Average [Member] | Other real estate owned
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Measurement Input	0.425	0.318

Fair Value - Fair Value of Fin

Fair Value - Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financial assets:
Cash and money market instruments	$ 167,214	$ 169,112
Mortgage loans held for sale	4,158	4,148
Impaired loans carried at fair value	6,399	3,574
Derivative Asset	87	94
Other loans, net (3)	5,570,136	5,247,021
Loans receivable, net	5,580,780	5,254,837
Financial liabilities:
Time Deposits, Fair Value	1,044,620	1,035,093
Other	1,267	1,269
Total deposits	1,045,887	1,036,362
Short-term borrowings	221,966	391,289
Long-term debt	400,203	504,503
Subordinated debentures/notes	12,959	13,370
Derivative financial instruments:
Investment Owned, at Fair Value	1,354,843	1,455,660
Level 1
Financial assets:
Cash and money market instruments	167,214	169,112
Derivative Asset	0	0
Loans receivable, net	0	0
Financial liabilities:
Other	1,267	1,269
Total deposits	1,267	1,269
Level 2
Financial assets:
Mortgage loans held for sale	4,158	4,148
Derivative Asset	87	94
Loans receivable, net	4,245	4,242
Financial liabilities:
Time Deposits, Fair Value	1,044,620	1,035,093
Total deposits	1,044,620	1,035,093
Short-term borrowings	221,966	391,289
Long-term debt	400,203	504,503
Subordinated debentures/notes	12,959	13,370
Derivative financial instruments:
Investment Owned, at Fair Value	1,354,843	1,455,660
Level 3
Financial assets:
Impaired loans carried at fair value	6,399	3,574
Derivative Asset	0	0
Other loans, net (3)	5,570,136	5,247,021
Loans receivable, net	5,576,535	5,250,595
Financial liabilities:
Total deposits	0	0
Equity securities
Derivative financial instruments:
Investment Owned, at Fair Value	1,649	1,935
Equity securities | Level 1
Derivative financial instruments:
Investment Owned, at Fair Value	1,225	1,518
Equity securities | Level 3
Derivative financial instruments:
Investment Owned, at Fair Value	424	417
Fair value swap
Derivative financial instruments:
Swaps, fair value	226	226
Fair value swap | Level 3
Derivative financial instruments:
Swaps, fair value	226	226
Reported Value Measurement [Member]
Financial assets:
Cash and money market instruments	167,214	169,112
Mortgage loans held for sale	4,158	4,148
Impaired loans carried at fair value	6,399	3,574
Derivative Asset	87	94
Other loans, net (3)	5,629,976	5,314,679
Loans receivable, net	5,640,620	5,322,495
Financial liabilities:
Time Deposits, Fair Value	1,043,177	1,033,476
Other	1,267	1,269
Total deposits	1,044,444	1,034,745
Short-term borrowings	221,966	391,289
Long-term debt	400,000	500,000
Subordinated debentures/notes	15,000	15,000
Derivative financial instruments:
Investment Owned, at Fair Value	1,355,229	1,449,078
Reported Value Measurement [Member] | Equity securities
Derivative financial instruments:
Investment Owned, at Fair Value	1,649	1,935
Reported Value Measurement [Member] | Fair value swap
Derivative financial instruments:
Swaps, fair value	$ 226	$ 226

Fair Value Schedule of Impaired

Fair Value Schedule of Impaired Financing Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Book Value Of Impaired Loans Carried At Fair Value	$ 6,503	$ 3,577
Partial Charge-Offs On Impaired Loans carried at Fair Value	3,630	2,780
Impaired Financing Receivable, Related Allowance	2,273	684
Impaired loans carried at fair value	6,399	3,574
Impaired Financing Receivable, loans not held at Fair Value, Recorded Investment	41,641	52,987
Partial Charge-offs on Impaired Loans carried at Cost	7,616	7,260
impaired Financing Receivable, loans not held at Fair Value, Carrying Amount	39,472	52,306
Recorded investment	48,144	56,564	$ 70,426
Partial charge-offs on impaired loans	11,246	10,040
Individually evaluated for impairment	2,273	684
Impaired Financing Receivable, Carrying Value	45,871	55,880
Financing Receivable, not collateral dependent [Domain]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	2,169	681
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Related Allowance	$ 104	$ 3

Capital Ratios - Capital Ratio

Capital Ratios - Capital Ratios for Park and Each Subsidiary (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital Conservation Buffer	1.875%	1.25%
Park National Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Risk-Based Capital	11.01%	10.35%
Tier One Risk Based Capital Required for Capital Adequacy	$ 345,970	$ 325,054
Common Equity Tier 1	11.01%	10.35%
Common Equity Tier One Capital Required for Capital Adequacy	$ 259,478	$ 243,791
Total Risk-Based	12.30%	11.60%
Capital Required for Capital Adequacy	$ 461,293	$ 433,406
Leverage Capital Required For Capital Adequacy To Average Total Assets	4.00%	4.00%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	6.00%	6.00%
Tier One Risk Based Capital Required to be Well Capitalized	$ 461,293	$ 433,406
Common Equity Tier 1 Capital Required For Capital Adequacy To Average Total Assets	4.50%	4.50%
Common Equity Tier One Capital Required to be Well-Capitalized	$ 374,801	$ 352,142
Leverage	8.29%	7.36%
Tier One Leverage Capital Required for Capital Adequacy	$ 306,485	$ 304,722
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%	8.00%
Capital Required to be Well Capitalized	$ 576,617	$ 541,757
Tier One Risk Based Capital	$ 634,909	$ 560,530
Common Equity Tier 1 Capital Required To Be Well Capitalized To Average Total Assets	6.50%	6.50%
Common Equity Tier One Capital	$ 634,909	$ 560,530
Risk Based Capital	$ 709,101	$ 628,440
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%
Tier One Leverage Capital	$ 634,909	$ 560,530
Tier One Leverage Capital Required to be Well Capitalized	$ 383,106	$ 380,903
Park
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Risk-Based Capital	13.30%	13.22%
Tier One Risk Based Capital Required for Capital Adequacy	$ 349,299	$ 329,235
Common Equity Tier 1	13.04%	12.94%
Common Equity Tier One Capital Required for Capital Adequacy	$ 261,975	$ 246,927
Total Risk-Based	14.19%	14.14%
Capital Required for Capital Adequacy	$ 465,732	$ 438,981
Leverage Capital Required For Capital Adequacy To Average Total Assets	4.00%	4.00%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	6.00%	6.00%
Tier One Risk Based Capital Required to be Well Capitalized	$ 349,299	$ 329,235
Common Equity Tier 1 Capital Required For Capital Adequacy To Average Total Assets	4.50%	4.50%
Leverage	10.04%	9.44%
Tier One Leverage Capital Required for Capital Adequacy	$ 308,397	$ 307,441
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%	8.00%
Capital Required to be Well Capitalized	$ 582,166	$ 548,726
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	$ 774,369	$ 725,221
Common Equity Tier One Capital	759,369	710,221
Risk Based Capital	$ 826,006	$ 775,867
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	6.00%	6.00%
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%	10.00%
Tier One Leverage Capital	$ 774,369	$ 725,221
Minimum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital Conservation Buffer			0.625%
Maximum
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital Conservation Buffer	2.50%

Segment Information - Schedule

Segment Information - Schedule of Operating Results by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net interest income	$ 266,898	$ 243,759	$ 238,086
Provision for (recovery of) loan losses	7,945	8,557	(5,101)
Other income	101,101	86,429	84,039
Gain (Loss) on Sale of Investments	(2,271)	1,821	0
Other Noninterest Expense	220,170	194,518	195,935
Depreciation, Amortization and Accretion, Net	8,585	8,644	8,396
Other expense	228,755	203,162	204,331
Income (loss) before income taxes	131,299	118,469	122,895
Income tax expense (benefit)	20,912	34,227	36,760
Net income	110,387	84,242	86,135
Assets	7,804,308	7,537,620	7,467,586
Loans	5,692,132	5,372,483	5,271,857
Total deposits	6,260,860	5,817,326	5,521,956
Totals For Reportable Segments [Member]
Segment Reporting Information [Line Items]
Net interest income	266,206	243,171	238,224
Other Noninterest Expense	205,552	185,713	186,204
Depreciation, Amortization and Accretion, Net	8,585	8,644	8,396
Income tax expense (benefit)	24,922	36,922	41,117
Assets	7,793,664	7,524,830	7,447,148
Total deposits	6,338,938	5,900,125	5,634,008
PNB
Segment Reporting Information [Line Items]
Net interest income	258,547	235,243	227,576
Provision for (recovery of) loan losses	7,569	9,898	2,611
Other income	88,981	82,742	79,959
Other expense	206,843	185,891	182,718
Income (loss) before income taxes	133,116	122,196	122,206
Income tax expense (benefit)	23,644	34,881	37,755
Net income	109,472	87,315	84,451
Assets	7,753,848	7,467,851	7,389,538
Loans	5,671,173	5,339,255	5,234,828
Total deposits	6,334,796	5,896,676	5,630,199
GFSC
Segment Reporting Information [Line Items]
Net interest income	5,048	5,839	5,874
Provision for (recovery of) loan losses	1,328	1,917	1,887
Other income	187	103	57
Other expense	3,245	3,099	4,515
Income (loss) before income taxes	662	926	(471)
Income tax expense (benefit)	141	666	(164)
Net income	521	260	(307)
Assets	31,388	32,077	32,268
Loans	32,664	33,385	32,661
Total deposits	4,142	3,449	3,809
SEPH
Segment Reporting Information [Line Items]
Net interest income	2,611	2,089	4,774
Provision for (recovery of) loan losses	(952)	(3,258)	(9,599)
Other income	5,900	519	3,068
Other expense	4,049	5,367	7,367
Income (loss) before income taxes	5,414	499	10,074
Income tax expense (benefit)	1,137	1,375	3,526
Net income	4,277	(876)	6,548
Assets	8,428	24,902	25,342
Loans	1,636	10,891	12,354
Total deposits	0	0	0
All Other
Segment Reporting Information [Line Items]
Net interest income	692	588	(138)
Provision for (recovery of) loan losses	0	0	0
Other income	6,033	3,065	955
Other expense	14,618	8,805	9,731
Income (loss) before income taxes	(7,893)	(5,152)	(8,914)
Income tax expense (benefit)	(4,010)	(2,695)	(4,357)
Net income	(3,883)	(2,457)	(4,557)
Assets	10,644	12,790	20,438
Loans	(13,341)	(11,048)	(7,986)
Total deposits	(78,078)	(82,799)	(112,052)
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Net interest income	1,275	1,500	2,164
Other Noninterest Expense	0	0	0
Depreciation, Amortization and Accretion, Net	0	0	0
Income tax expense (benefit)	0	0	0
Assets	(16,521)	(14,679)	(9,204)
Total deposits	(78,078)	(82,799)	(112,052)
Parent Co Gfsc Totals Not Eliminated [Member]
Segment Reporting Information [Line Items]
Net interest income	(583)	(912)	(2,302)
Other Noninterest Expense	14,618	8,805	9,731
Depreciation, Amortization and Accretion, Net	0	0	0
Income tax expense (benefit)	(4,010)	(2,695)	(4,357)
Assets	27,165	27,469	29,642
Total deposits	$ 0	$ 0	$ 0

Parent Company Statements - Na

Parent Company Statements - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Parent Company
Income taxes	$ 3,900	$ 3,300	$ 4,400

Parent Company Statements - Ba

Parent Company Statements - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets:
Other assets	$ 585,394	$ 533,189
Total assets	7,804,308	7,537,620	$ 7,467,586
Liabilities:
Subordinated notes	15,000	15,000
Other liabilities	73,976	57,904
Total liabilities	6,971,802	6,781,519
Total liabilities and shareholders’ equity	7,804,308	7,537,620
Parent Company
Assets:
Cash	75,094	79,452	$ 112,067	$ 102,416
Investment in subsidiaries	727,773	645,287
Debentures receivable from PNB	25,000	25,000
Other investments	1,165	1,398
Other assets	25,972	26,838
Total assets	855,004	777,975
Liabilities:
Subordinated notes	15,000	15,000
Other liabilities	7,498	6,874
Total liabilities	22,498	21,874
Total shareholders’ equity	832,506	756,101
Total liabilities and shareholders’ equity	$ 855,004	$ 777,975

Parent Company Statements - St

Parent Company Statements - Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income:
Interest and dividends	$ 310,801	$ 286,424	$ 276,258
Gain (Loss) on Sale of Investments	(2,271)	1,821	0
Interest Expense	43,903	42,665	38,172
Expense:
Income tax benefit	(20,912)	(34,227)	(36,760)
Net income	110,387	84,242	86,135
Other Comprehensive Income (Loss), Net of Tax	(18,533)	(8,709)	(2,102)
Parent Company
Income:
Dividends from subsidiaries	100,000	60,000	60,000
Interest and dividends	1,275	1,500	2,164
Gain (Loss) on Sale of Investments	0	1,821	0
Other	6,068	1,405	1,081
Total income	107,343	64,726	63,245
Interest Expense	617	1,073	2,429
Expense:
Other, net	14,619	8,805	9,730
Total expense	15,236	9,878	12,159
Income before income taxes and equity in undistributed income of subsidiaries	92,107	54,848	51,086
Income tax benefit	4,010	2,695	4,357
Income before equity in undistributed income of subsidiaries	96,117	57,543	55,443
Equity in undistributed income of subsidiaries	14,270	26,699	30,692
Net income	110,387	84,242	86,135
Other Comprehensive Income (Loss), Net of Tax	(18,533)	(8,709)	(2,102)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 91,854	$ 75,533	$ 84,033

Parent Company Statements - _2

Parent Company Statements - Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income	$ 110,387	$ 84,242	$ 86,135
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation expense	5,063	3,942	2,814
Debt and Equity Securities, Unrealized Gain (Loss)	(3,267)	0	0
(Decrease) increase in other liabilities	5,131	(11,778)	2,006
Net cash provided by operating activities	132,950	87,991	87,887
Payments to Acquire Businesses, Gross	(30,684)	0	0
Investing activities:
Other investing activities, net	60	0	0
Net cash used in investing activities	44,292	(61,971)	(152,560)
Financing activities
Repayment of subordinated notes	0	(30,000)	0
Payments Related to Tax Withholding for Share-based Compensation	610	347	0
Net cash (used in) provided by financing activities	(179,140)	(3,354)	61,660
Increase (decrease) in cash and cash equivalents	(1,898)	22,666	(3,013)
Parent Company
Net income	110,387	84,242	86,135
Adjustments to reconcile net income to net cash provided by operating activities:
Undistributed income of subsidiaries	(14,270)	(26,699)	(30,692)
Compensation expense for issuance of treasury shares to directors	1,109	1,241	950
Share-based compensation expense	3,954	2,701	1,864
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments	0	(1,821)	0
(Increase) decrease in other assets	(2,073)	205	(3,425)
(Decrease) increase in other liabilities	(163)	475	(2,524)
Net cash provided by operating activities	95,677	60,344	52,308
Proceeds from Sale of Available-for-sale Securities, Equity	0	2,265	0
Investing activities:
Repayment of investments in and advances to subsidiaries	0	0	(15,000)
Net cash used in investing activities	(30,624)	2,265	15,000
Financing activities
Cash dividends paid	(63,013)	(57,493)	(57,653)
Cash payment for fractional shares	(4)	(6)	(4)
Payments Related to Tax Withholding for Share-based Compensation	(610)	(347)	0
Net cash (used in) provided by financing activities	(69,411)	(95,224)	(57,657)
Increase (decrease) in cash and cash equivalents	(4,358)	(32,615)	9,651
Cash at beginning of year	79,452	112,067	102,416
Cash at end of year	75,094	79,452	112,067
Treasury Stock, Common [Member]
Financing activities
Payments for Repurchase of Equity	$ 5,784	$ 7,378	$ 0

Revenue from Contract with Cu_2

Revenue from Contract with Customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Personal trust and agency accounts income	$ 8,495	$ 7,752	$ 7,101
Employee benefit and retirement-related accounts income	6,863	6,234	5,432
Investment management and investment advisory agency accounts income	9,352	8,386	7,693
Other income from fiduciary activities	1,583	1,363	1,174
Non-sufficient funds (NSF) fees	7,483	8,122	8,970
Demand deposit account (DDA) charges	3,310	3,847	3,932
Other service charges on deposit accounts	668	684	1,357
Credit card other service income	2,239	1,981	1,584
HELOC other service income	471	478	458
Installment other service income	243	387	638
Real estate other service income	9,079	9,005	9,319
Commercial other service income	2,234	1,311	2,420
Checkcard fee income	17,317	15,798	15,057
Bank owned life insurance income	6,815	4,858	4,338
ATM fees	1,978	2,253	2,268
OREO valuation adjustments	(491)	(458)	(601)
Gain on the sale of OREO, net	4,235	251	1,323
Net (loss) gain on the sale of investment securities	(2,271)	1,821	0
Gain on equity securities, net	3,213	0	0
Other components of net periodic benefit income	6,820	5,794	5,308
Gain on the sale of non-performing loans	2,826	0	0
Miscellaneous	8,639	6,562	6,268
Noninterest Income	101,101	86,429	84,039
Within Scope [Domain]
Disaggregation of Revenue [Line Items]
Miscellaneous	5,500	4,400	5,400
Out of Scope [Domain]
Disaggregation of Revenue [Line Items]
Miscellaneous	8,800	8,800	9,000
Pnb Segment [Member]
Disaggregation of Revenue [Line Items]
Personal trust and agency accounts income	8,495	7,752	7,101
Employee benefit and retirement-related accounts income	6,863	6,234	5,432
Investment management and investment advisory agency accounts income	9,352	8,386	7,693
Other income from fiduciary activities	1,583	1,363	1,174
Non-sufficient funds (NSF) fees	7,483	8,122	8,970
Demand deposit account (DDA) charges	3,310	3,847	3,932
Other service charges on deposit accounts	668	684	1,357
Credit card other service income	2,212	1,987	1,584
HELOC other service income	471	474	453
Installment other service income	243	387	638
Real estate other service income	9,079	8,974	9,319
Commercial other service income	1,153	1,118	739
Checkcard fee income	17,317	15,798	15,057
Bank owned life insurance income	4,903	4,441	3,913
ATM fees	1,978	2,253	2,268
OREO valuation adjustments	272	458	583
Gain on the sale of OREO, net	1,440	239	257
Net (loss) gain on the sale of investment securities	(2,271)	0
Gain on equity securities, net	(53)
Other components of net periodic benefit income	6,609	5,616	5,156
Gain on the sale of non-performing loans	660
Miscellaneous	7,758	5,525	5,499
Noninterest Income	88,981	82,742	79,959
GFSC
Disaggregation of Revenue [Line Items]
Personal trust and agency accounts income	0	0	0
Employee benefit and retirement-related accounts income	0	0	0
Investment management and investment advisory agency accounts income	0	0	0
Other income from fiduciary activities	0	0	0
Non-sufficient funds (NSF) fees	0	0	0
Demand deposit account (DDA) charges	0	0	0
Other service charges on deposit accounts	0	0	0
Credit card other service income	27	(6)	0
HELOC other service income	0	0	0
Installment other service income	0	0	0
Real estate other service income	0	0	0
Commercial other service income	0	0	0
Checkcard fee income	0	0	0
Bank owned life insurance income	0	0	0
ATM fees	0	0	0
OREO valuation adjustments	0	0	0
Gain on the sale of OREO, net	0	0	0
Net (loss) gain on the sale of investment securities	0	0
Gain on equity securities, net	0
Other components of net periodic benefit income	75	63	58
Gain on the sale of non-performing loans	0
Miscellaneous	85	46	(1)
Noninterest Income	187	103	57
SEPH
Disaggregation of Revenue [Line Items]
Personal trust and agency accounts income	0	0	0
Employee benefit and retirement-related accounts income	0	0	0
Investment management and investment advisory agency accounts income	0	0	0
Other income from fiduciary activities	0	0	0
Non-sufficient funds (NSF) fees	0	0	0
Demand deposit account (DDA) charges	0	0	0
Other service charges on deposit accounts	0	0	0
Credit card other service income	0	0	0
HELOC other service income	0	4	5
Installment other service income	0	0	0
Real estate other service income	0	31	0
Commercial other service income	1,081	193	1,681
Checkcard fee income	0	0	0
Bank owned life insurance income	0	0	0
ATM fees	0	0	0
OREO valuation adjustments	219	0	18
Gain on the sale of OREO, net	2,795	12	1,066
Net (loss) gain on the sale of investment securities	0	0
Gain on equity securities, net	0
Other components of net periodic benefit income	136	115	94
Gain on the sale of non-performing loans	2,166
Miscellaneous	(59)	164	240
Noninterest Income	5,900	519	3,068
All Other
Disaggregation of Revenue [Line Items]
Personal trust and agency accounts income	0	0	0
Employee benefit and retirement-related accounts income	0	0	0
Investment management and investment advisory agency accounts income	0	0	0
Other income from fiduciary activities	0	0	0
Non-sufficient funds (NSF) fees	0	0	0
Demand deposit account (DDA) charges	0	0	0
Other service charges on deposit accounts	0	0	0
Credit card other service income	0	0	0
HELOC other service income	0	0	0
Installment other service income	0	0	0
Real estate other service income	0	0	0
Commercial other service income	0	0	0
Checkcard fee income	0	0	0
Bank owned life insurance income	1,912	417	425
ATM fees	0	0	0
OREO valuation adjustments	0	0	0
Gain on the sale of OREO, net	0	0	0
Net (loss) gain on the sale of investment securities	0	1,821
Gain on equity securities, net	3,266
Other components of net periodic benefit income	0	0	0
Gain on the sale of non-performing loans	0
Miscellaneous	855	827	530
Noninterest Income	$ 6,033	$ 3,065	$ 955

Subsequent Event (Details)

Subsequent Event (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross		$ 30,684,000	$ 0	$ 0
Stock option price threshold		$ 19
Subsequent Event [Member]
Business Acquisition [Line Items]
Common Stock, Par or Stated Value Per Share	$ 1
Business Combination, Contingent Consideration, Asset, Current	$ 3.80
Subsequent Event [Member] | Common Shares
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 0.1378