Park National (PRK) 10-Q 2 May 18 2018 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 01, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
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 Common Stock, Shares Outstanding		15,301,101

Consolidated Condensed Balance

Consolidated Condensed Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets:
Cash and due from banks	$ 110,163	$ 131,946
Money market instruments	166,418	37,166
Cash and cash equivalents	276,581	169,112
Investment securities:
Debt securities available-for-sale, at fair value (amortized cost of $1,079,745 and $1,097,645 at March 31, 2018 and December 31, 2017, respectively)	1,046,910	1,091,881
Debt securities held-to-maturity, at amortized cost (fair value of $346,199 and $363,779 at March 31, 2018 and December 31, 2017, respectively)	347,622	357,197
Other Marketable Securities, Noncurrent	69,824	63,746
Total investment securities	1,464,356	1,512,824
Loan balance	5,292,349	5,372,483
Allowance for loan losses	(48,969)	(49,988)
Net loans	5,243,380	5,322,495
Bank owned life insurance	188,952	189,322
Prepaid assets	101,635	97,712
Goodwill	72,334	72,334
Premises and equipment, net	56,239	55,901
Affordable housing tax credit investments	47,818	49,669
Other real estate owned	9,055	14,190
Interest Receivable	20,369	22,164
Mortgage loan servicing rights	9,969	9,688
Other	28,282	22,209
Total assets	7,518,970	7,537,620
Liabilities and Shareholders' Equity:
Noninterest bearing	1,618,200	1,633,941
Interest bearing	4,466,094	4,183,385
Total deposits	6,084,294	5,817,326
Short-term borrowings	184,090	391,289
Long-term debt	425,000	500,000
Subordinated debentures and notes	15,000	15,000
Unfunded commitments in affordable housing tax credit investments	14,282	14,282
Accrued interest payable	2,024	2,278
Other	41,506	41,344
Total liabilities	6,766,196	6,781,519
Shareholders' equity:
Preferred shares (200,000 shares authorized; 0 shares issued)	0	0
Common shares (No par value; 20,000,000 shares authorized; 16,150,740 shares issued at March 31, 2018 and 16,150,752 shares issued at December 31, 2017)	307,249	307,726
Retained earnings	583,941	561,908
Treasury shares (849,637 shares at March 31, 2018 and 862,558 at December 31, 2017)	(85,775)	(87,079)
Accumulated other comprehensive loss, net of taxes	(52,641)	(26,454)
Total shareholders' equity	752,774	756,101
Total liabilities and shareholders' equity	$ 7,518,970	$ 7,537,620

Consolidated Condensed Balance3

Consolidated Condensed Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Securities available-for-sale, amortized cost	$ 1,079,745	$ 1,097,645
Securities held-to-maturity, fair value	$ 346,199	$ 363,779
Preferred Stock, Shares Authorized	200,000	200,000
Preferred Stock, Shares Issued	0	0
Common stock no par value	$ 0	$ 0
Common stock shares authorized	20,000,000	20,000,000
Common stock shares issued	16,150,740	16,150,752
Treasury stock shares	849,637	862,558

Consolidated Condensed Statemen

Consolidated Condensed Statements Of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest and dividend income:
Interest and fees on loans	$ 64,402	$ 59,908
Interest and dividends on:
Obligations of U.S. Government, its agencies and other securities	6,767	7,138
Interest Income, Securities, State and Municipal	2,174	1,460
Other interest income	371	249
Total interest and dividend income	73,714	68,755
Interest on deposits:
Demand and savings deposits	3,290	1,614
Time deposits	2,551	2,161
Interest on borrowings:
Short-term borrowings	575	235
Long-term debt	2,448	5,793
Total interest expense	8,864	9,803
Net interest income	64,850	58,952
Provision for loan losses	260	876
Net interest income after provision for loan losses	64,590	58,076
Other income:
Income from fiduciary activities	6,395	5,514
Service charges on deposit accounts	2,922	3,139
Other service income	4,172	2,804
Checkcard fee income	4,002	3,761
Bank owned life insurance income	1,009	1,103
ATM Fees	524	542
OREO valuation adjustments	(207)	(73)
Gain on sale of OREO, net	4,321	100
Gain (Loss) on Sale of Investments	(2,271)	0
Unrealized gain loss on equity securities	3,489	0
Other components of net periodic benefit income	1,705	1,448
Other	842	617
Total other income	26,903	18,955
Other expense:
Salaries and employee benefits	25,320	22,717
Employee Benefits and Share-based Compensation	7,029	6,468
Occupancy expense	2,936	2,635
Furniture and equipment expense	4,149	3,618
Data processing fees	1,773	1,965
Professional fees and services	6,190	4,829
Marketing	1,218	1,056
Insurance	1,428	1,570
Communication	1,250	1,333
Excise and Sales Taxes	1,105	1,063
Other expense	1,910	1,656
Total other expense	54,308	48,910
Income before income taxes	37,185	28,121
Income taxes	6,062	7,854
Net income	31,123	20,267
Net income available to common shareholders	$ 31,123	$ 20,267
Net income available to common shareholders
Basic	$ 2.04	$ 1.32
Diluted	$ 2.02	$ 1.31
Weighted average common shares outstanding
Basic	15,288,332	15,312,059
Diluted	15,431,328	15,432,769
Cash dividends declared	$ 0.94	$ 0.94

Consolidated Condensed Stateme5

Consolidated Condensed Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Income	$ 31,123	$ 20,267
Other comprehensive income, net of tax:
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	2,024	0
Unrealized net holding (loss) gain on debt securities available-for-sale, net of federal income tax effect of $(6,223) and $550 for the three months ended March 31, 2018 and 2017, respectively	(23,410)	1,022
Other comprehensive income (loss)	(21,386)	1,022
Comprehensive income	9,737	21,289
Accounting Standards Update 2016-01 [Member]
Other comprehensive income, net of tax:
Other comprehensive income (loss)	(26,187)
Accumulated Other Comprehensive Income (loss) [Member]
Other comprehensive income, net of tax:
Unrealized net holding (loss) gain on debt securities available-for-sale, net of federal income tax effect of $(6,223) and $550 for the three months ended March 31, 2018 and 2017, respectively	$ (21,386)	$ 1,022

Consolidated Condensed Stateme6

Consolidated Condensed Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	$ (6,223)	$ 550
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax	$ 538

Consolidated Condensed Stateme7

Consolidated Condensed Statements Of Changes In Stockholders' Equity - USD ($) $ in Thousands	Total	Preferred Stock [Member]	Common Stock [Member]	Retained Earnings [Member]	Treasury Stock At Cost [Member]	Accumulated Other Comprehensive Income (loss) [Member]
Balance at Dec. 31, 2016		$ 0	$ 305,826	$ 535,631	$ (81,472)	$ (17,745)
Net Income	$ 20,267			20,267
Other comprehensive income, net of tax:
Unrealized net holding (loss) gain on securities available-for-sale, net of income taxes	1,022					1,022
Dividends on common shares at $0.94 per share				(14,460)
Cash payment for fractional shares in dividend reinvestment plan			(1)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures			(795)	(197)	(645)
Allocated Share-based Compensation Expense	826		826
Treasury Stock, Value, Acquired, Cost Method					5,425
Balance at Mar. 31, 2017		0	305,856	541,241	(86,252)	(16,723)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets				3,806		(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]						(995)
Balance at Dec. 31, 2017	756,101	0	307,726	561,908	(87,079)	(26,454)
Balance (Adjustments for New Accounting Pronouncement [Member]) at Dec. 31, 2017				563,825		(27,449)
Net Income	31,123			31,123
Other comprehensive income, net of tax:
Unrealized net holding (loss) gain on securities available-for-sale, net of income taxes	(23,410)					(21,386)
Dividends on common shares at $0.94 per share				(14,496)
Cash payment for fractional shares in dividend reinvestment plan			(1)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures			(1,597)	(317)	(1,304)
Allocated Share-based Compensation Expense	1,121		1,121
Balance at Mar. 31, 2018	$ 752,774	$ 0	$ 307,249	583,941	$ (85,775)	$ (52,641)
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

Consolidated Condensed Stateme8

Consolidated Condensed Statements Of Changes In Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Stockholders' Equity [Abstract]
Cash dividends on common stock per share	$ 0.94	$ 0.94
Treasury Stock, Shares, Acquired	0	50,000
Stock Issued During Period, Shares, Restricted Stock Award, Gross	18,800	9,674

Consolidated Condensed Stateme9

Consolidated Condensed Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	$ 260	$ 876
Amortization of investment securities, net	(1,506)	(1,386)
Provision for depreciation	2,135	2,121
Amortization of investment securities, net	405	258
Gain (Loss) on Sale of Investments	2,271	0
Unrealized gain loss on equity securities	(3,489)	0
Amortization of prepayment penalty on long-term debt	0	1,559
Loan originations to be sold in secondary market	(40,379)	(42,370)
Proceeds from sale of loans in secondary market	38,769	46,848
Share-based compensation expense	1,121	826
OREO valuation adjustments	207	73
Gain on sale of OREO, net	(4,321)	(100)
Bank owned life insurance income	(1,009)	(1,103)
Amortization Method Qualified Affordable Housing Project Investments, Amortization	1,851	1,864
Changes in assets and liabilities:
Increase in other assets	(1,159)	(3,366)
Decrease in other liabilities	(2,891)	(63)
Net cash provided by operating activities	21,972	23,116
Investing activities:
Proceeds from Sale of Available-for-sale Securities	252,055	0
Proceeds from maturity of:
Available-for-sale securities	41,097	40,382
Held-to-maturity securities	1,652	5,990
Purchases of:
Available-for-sale securities	(270,005)	0
Payments to Acquire Held-to-maturity Securities	0	(30,943)
Payments to Acquire Available-for-sale Securities, Equity	(101)	0
Net loan originations, portfolio loans	82,288	(46,115)
Proceeds from the sale of OREO	9,816	674
Life insurance death benefits	1,379	74
Purchases of premises and equipment, net	(2,473)	(1,379)
Net cash provided by (used in) investing activities	115,708	(31,317)
Financing activities:
Net increase in deposits	266,968	398,604
Net decrease in short-term borrowings	(207,199)	(174,932)
Proceeds from issuance of long-term debt	25,000	50,000
Repayments of Long-term Debt	(100,000)	0
Payments Related to Tax Withholding for Share-based Compensation	(610)	(347)
Repurchase of common shares to be held as treasury shares	0	(5,425)
Cash dividends paid	(14,370)	(14,373)
Net cash (used in) provided by financing activities	(30,211)	253,527
Increase in cash and cash equivalents	107,469	245,326
Cash and cash equivalents at beginning of year	169,112	146,446
Cash and cash equivalents at end of period	276,581	391,772
Supplemental disclosures of cash flow information:
Cash paid for interest	9,118	9,765
Cash paid for income taxes	0	7,500
Non cash activities:
Loans transferred to OREO	628	448
Securities acquired through payable	2,448	0
Consumer Portfolio Segment [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Increase (Decrease) in Prepaid Expense	(471)	(2,401)
Mortgage Loans on Real Estate [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of loans in secondary market	$ 945	$ 787

Basis Of Presentation

Basis Of Presentation	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis Of Presentation	Basis of Presentation The accompanying unaudited consolidated condensed financial statements included in this report have been prepared for Park National Corporation (sometimes also referred to as the “Registrant”) and its subsidiaries. Unless the context otherwise requires, references to "Park", the "Corporation" or the "Company" and similar terms mean Park National Corporation and its subsidiaries. In the opinion of management, all adjustments (consisting of normal recurring accruals) necessary for a fair presentation of the results of operations for the interim periods included herein have been made. The results of operations for the three-month periods ended March 31, 2018 are not necessarily indicative of the operating results to be anticipated for the fiscal year ending December 31, 2018. The accompanying unaudited consolidated condensed financial statements have been prepared in accordance with the instructions for Form 10-Q and, therefore, do not include all information and footnotes necessary for a fair presentation of the condensed balance sheets, condensed statements of income, condensed statements of comprehensive income, condensed statements of changes in shareholders’ equity and condensed statements of cash flows in conformity with United States ("U.S.") generally accepted accounting principles (“U.S. GAAP”). These financial statements should be read in conjunction with the consolidated financial statements incorporated by reference in the Annual Report on Form 10-K of Park for the fiscal year ended December 31, 2017 from Park’s 2017 Annual Report to Shareholders (“Park's 2017 Annual Report”). Prior period financial statement 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. This change in classification had no effect on reported net income. Park’s significant accounting policies are described in Note 1 of the Notes to Consolidated Financial Statements included in Park’s 2017 Annual Report. For interim reporting purposes, Park follows the same basic accounting policies, as updated by the information contained in this report, and considers each interim period an integral part of an annual period.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recent Accounting Pronouncements	Adoption of New Accounting Pronouncements and Issued Not Yet Effective Accounting Standards The following is a summary of new accounting pronouncements impacting Park's consolidated financial statements, and issued 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 first quarter 2018 Form 10-Q. Reference Note 19, 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 to the current U.S. GAAP model primarily affect the accounting for equity investments, financial liabilities under the fair value option, and the presentation and disclosure requirements for financial instruments. In addition, this ASU clarifies guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale ("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 an $1.9 million increase to beginning retained earnings and a $995,000 increase to beginning accumulated other comprehensive loss. Additional income of $3.2 million was recorded in the first quarter of 2018 as a result of changes to the accounting for equity investments. Further, beginning with the first quarter of 2018, Park's fair value disclosures in Note 14 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 12 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 in 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 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 newly - enacted federal corporate income tax rate. 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 on 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 on January 1, 2018. Issued 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. Early adoption is permitted. Management is currently analyzing data on leased assets. The adoption of this guidance is expected to increase both assets and liabilities, but is not expected to have a material impact on Park's consolidated statement of income. ASU 2016-13 - 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, held-to-maturity ("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 implementing a software solution to assist in the adoption of this ASU. Management plans to run our current allowance model and a CECL model concurrently for 12 months prior to the adoption of this guidance on January 1, 2020. 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 U.S. 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. Early adoption is permitted for interim or annual periods. The adoption of this guidance is not expected to have a material impact on 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 adoption of this guidance is not expected to have a material impact on Park's consolidated financial statements. Park is considering the early adoption of this guidance. The following table summarizes the impact of retrospective application of this ASU to the consolidated condensed statement of income for the three months ended March 31, 2017. (in thousands) Three Months Ended Other components of net periodic benefit income As previously reported $ — As reported under new guidance 1,448 Total other income As previously reported $ 17,507 As reported under new guidance 18,955 Employee benefits expense As previously reported $ 5,181 As reported under new guidance 6,468 Miscellaneous expense As previously reported $ 1,495 As reported under new guidance 1,656 Total other expense As previously reported $ 47,462 As reported under new guidance 48,910

Loans

Loans	3 Months Ended
	Mar. 31, 2018
Loans and Leases Receivable Disclosure [Abstract]
Loans	Loans The composition of the loan portfolio, by class of loan, as of March 31, 2018 and December 31, 2017 was as follows: March 31, 2018 December 31, 2017 (In thousands) Loan Balance Accrued Interest Receivable Recorded Investment Loan Balance Accrued Interest Receivable Recorded Investment Commercial, financial and agricultural * $ 1,000,786 $ 4,243 $ 1,005,029 $ 1,053,453 $ 4,413 $ 1,057,866 Commercial real estate * 1,156,563 4,047 1,160,610 1,167,607 4,283 1,171,890 Construction real estate: Commercial 126,561 375 126,936 125,389 401 125,790 Mortgage 51,379 119 51,498 52,203 133 52,336 Installment 3,244 11 3,255 3,878 13 3,891 Residential real estate: Commercial 389,766 1,043 390,809 393,094 1,029 394,123 Mortgage 1,097,166 1,327 1,098,493 1,110,426 1,516 1,111,942 HELOC 194,158 904 195,062 203,178 974 204,152 Installment 17,570 49 17,619 18,526 53 18,579 Consumer 1,252,251 3,462 1,255,713 1,241,736 3,808 1,245,544 Leases 2,905 46 2,951 2,993 36 3,029 Total loans $ 5,292,349 $ 15,626 $ 5,307,975 $ 5,372,483 $ 16,659 $ 5,389,142 * Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class. Loans are shown net of deferred origination fees, costs and unearned income of $12.3 million at March 31, 2018 and $12.2 million at December 31, 2017 , which represented a net deferred income position in both periods. Overdrawn deposit accounts of $1.4 million and $1.9 million had been reclassified to loans at March 31, 2018 and December 31, 2017 , respectively, and are included in the commercial, financial and agricultural loan class above. Credit Quality The following tables present the recorded investment in nonaccrual loans, accruing troubled debt restructurings ("TDRs"), and loans past due 90 days or more and still accruing by class of loan as of March 31, 2018 and December 31, 2017 : March 31, 2018 (In thousands) Nonaccrual Loans Accruing TDRs Loans Past Due 90 Days or More and Accruing Total Nonperforming Loans Commercial, financial and agricultural $ 25,985 $ 1,088 $ — $ 27,073 Commercial real estate 14,213 4,770 — 18,983 Construction real estate: Commercial 960 433 — 1,393 Mortgage — 16 — 16 Installment 43 6 — 49 Residential real estate: Commercial 2,674 222 — 2,896 Mortgage 16,856 10,022 669 27,547 HELOC 1,482 882 47 2,411 Installment 527 695 — 1,222 Consumer 3,411 623 690 4,724 Total loans $ 66,151 $ 18,757 $ 1,406 $ 86,314 December 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 loans and accruing TDR loans that were individually evaluated for impairment and those collectively evaluated for impairment, as of March 31, 2018 and December 31, 2017 . March 31, 2018 December 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 $ 27,073 $ 27,050 $ 23 $ 18,064 $ 18,039 $ 25 Commercial real estate 18,983 18,983 — 18,142 18,142 — Construction real estate: Commercial 1,393 1,393 — 1,324 1,324 — Mortgage 16 — 16 100 — 100 Installment 49 — 49 52 — 52 Residential real estate: Commercial 2,896 2,896 — 19,059 19,059 — Mortgage 26,878 — 26,878 27,607 — 27,607 HELOC 2,364 — 2,364 2,618 — 2,618 Installment 1,222 — 1,222 1,202 — 1,202 Consumer 4,034 — 4,034 4,065 — 4,065 Total loans $ 84,908 $ 50,322 $ 34,586 $ 92,233 $ 56,564 $ 35,669 All of the loans individually evaluated for impairment were evaluated using the fair value of the underlying 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, together with the related allowance recorded, as of March 31, 2018 and December 31, 2017 . March 31, 2018 December 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 $ 27,201 $ 22,255 $ — $ 19,899 $ 14,704 $ — Commercial real estate 18,370 17,901 — 18,974 18,060 — Construction real estate: Commercial 1,264 1,265 — 2,788 1,324 — Residential real estate: Commercial 3,107 2,786 — 19,346 19,012 — With an allowance recorded: Commercial, financial and agricultural 7,082 4,795 1,165 5,394 3,335 681 Commercial real estate 1,524 1,082 29 137 82 2 Construction real estate: Commercial 1,592 128 8 — — — Residential real estate: Commercial 123 110 5 47 47 1 Consumer — — — — — — Total $ 60,263 $ 50,322 $ 1,207 $ 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 March 31, 2018 and December 31, 2017 , there were $5.8 million and $7.9 million , respectively, of partial charge-offs on loans individually evaluated for impairment with no related allowance recorded and $4.2 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 March 31, 2018 and December 31, 2017 of $1.2 million and $0.7 million , respectively. These loans with specific reserves had a recorded investment of $6.1 million and $3.5 million as of March 31, 2018 and December 31, 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 table presents the average recorded investment and interest income recognized subsequent to impairment on loans individually evaluated for impairment as of and for the three months ended March 31, 2018 and March 31, 2017 : Three Months Ended Three Months Ended (In thousands) Recorded Investment as of March 31, 2018 Average Recorded Investment Interest Income Recognized Recorded Investment as of March 31, 2017 Average Recorded Investment Interest Income Recognized Commercial, financial and agricultural $ 27,050 $ 20,078 $ 174 $ 22,542 $ 19,471 $ 220 Commercial real estate 18,983 18,193 202 22,732 23,297 231 Construction real estate: Commercial 1,393 1,377 14 2,041 2,096 15 Residential real estate: Commercial 2,896 11,215 31 22,803 23,081 345 Consumer — — — 9 5 — Total $ 50,322 $ 50,863 $ 421 $ 70,127 $ 67,950 $ 811 The following tables present the aging of the recorded investment in past due loans as of March 31, 2018 and December 31, 2017 by class of loan. March 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 $ 1,483 $ 13,100 $ 14,583 $ 990,446 $ 1,005,029 Commercial real estate 210 2,748 2,958 1,157,652 1,160,610 Construction real estate: Commercial — — — 126,936 126,936 Mortgage 84 — 84 51,414 51,498 Installment 49 3 52 3,203 3,255 Residential real estate: Commercial 413 1,023 1,436 389,373 390,809 Mortgage 9,465 8,010 17,475 1,081,018 1,098,493 HELOC 570 729 1,299 193,763 195,062 Installment 268 215 483 17,136 17,619 Consumer 7,567 1,798 9,365 1,246,348 1,255,713 Leases — — — 2,951 2,951 Total loans $ 20,109 $ 27,626 $ 47,735 $ 5,260,240 $ 5,307,975 (1) Includes $1.4 million of loans past due 90 days or more and accruing. The remaining loans were past due nonaccrual loans. (2) Includes $39.9 million of nonaccrual loans which were current in regards to contractual principal and interest payments. December 31, 2017 (in thousands) Accruing Loans Past Due 30-89 Days Past Due (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 $1.8 million of loans past due 90 days or more and accruing. The remaining loans were past due nonaccrual loans. (2) Includes $56.1 million of nonaccrual loans which were 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 March 31, 2018 and December 31, 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 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 an 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 to be watch list credits, are considered to represent higher credit risk and, as a result, a higher loan loss reserve percentage is allocated to these loans. Loans classified as substandard are inadequately protected by the current sound worth and paying capacity of the obligor or the value of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that Park will sustain some loss if the deficiencies are not corrected. Commercial loans that are graded a 7 (doubtful) are shown as nonaccrual and Park generally charges these loans down to their fair value by taking a partial charge-off or recording a specific reserve. Loans classified as doubtful have all the weaknesses inherent in those classified as substandard with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable. Certain 6-rated loans and all 7-rated loans are 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 March 31, 2018 and December 31, 2017 for all commercial loans: March 31, 2018 (In thousands) 5 Rated 6 Rated Nonaccrual and Accruing TDRs Pass-Rated Recorded Investment Commercial, financial and agricultural * $ 475 $ 130 $ 27,073 $ 977,351 $ 1,005,029 Commercial real estate * 2,176 — 18,983 1,139,451 1,160,610 Construction real estate: Commercial — 344 1,393 125,199 126,936 Residential real estate: Commercial 412 — 2,896 387,501 390,809 Leases — — — 2,951 2,951 Total commercial loans $ 3,063 $ 474 $ 50,345 $ 2,632,453 $ 2,686,335 * Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class. December 31, 2017 (In thousands) 5 Rated 6 Rated Nonaccrual and Accruing TDRs 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 each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class. Troubled Debt Restructurings ("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 three-month periods ended March 31, 2018 and March 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 did not contain a concessionary interest rate or other concessionary terms, management considers the potential removal of the TDR classification. If deemed appropriate, the TDR classification is removed if 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. The TDR classification was removed on $324,000 of loans during the three-month period ended March 31, 2018 . There were no TDR classifications removed during the three -month period ended March 31, 2017 . At March 31, 2018 and December 31, 2017 , there were $24.0 million and $38.5 million , respectively, of TDRs included in the nonaccrual loan totals. At March 31, 2018 and December 31, 2017 , $18.5 million and $32.4 million , respectively, of these nonaccrual TDRs were performing in accordance with the terms of the restructured note. As of March 31, 2018 and December 31, 2017 , loans with a recorded investment of $18.8 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 is appropriate to move certain nonaccrual TDRs to accrual status in the future. At March 31, 2018 and December 31, 2017 , Park had commitments to lend $0.8 million and $1.3 million , respectively, of additional funds to borrowers whose outstanding loan terms had been modified in a TDR. There were $0.7 million and $0.5 million of specific reserves related to TDRs at March 31, 2018 and December 31, 2017 , 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 Accounting Standards Codification (ASC) 310. Additional specific reserves of $10,000 and $280,000 were recorded during the three -month periods ended March 31, 2018 and March 31, 2017 , respectively, as a result of TDRs identified in the respective periods. The terms of certain other loans were modified during the three -month periods ended March 31, 2018 and March 31, 2017 that did not meet the definition of a TDR. There were no modified substandard commercial loans which did not meet the definition of a TDR at March 31, 2018 . Modified substandard commercial loans which did not meet the definition of a TDR had a total recorded investment of $113,000 at March 31, 2017 . 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 loans such that each modification was deemed to be at market terms. Consumer loans modified during the three -month periods ended March 31, 2018 and March 31, 2017 which did not meet the definition of a TDR had a total recorded investment of $6.0 million and $1.4 million , respectively. Many of these loans were to borrowers who were not experiencing financial difficulties but who were looking to reduce their cost of funds. The following tables detail the number of contracts modified as TDRs during the three -month periods ended March 31, 2018 and March 31, 2017 , as well as the recorded investment of these contracts at March 31, 2018 and March 31, 2017 . The recorded investment pre- and post-modification is generally the same due to the fact that Park does not typically forgive principal. Three Months Ended (In thousands) Number of Contracts Accruing Nonaccrual Total Recorded Investment Commercial, financial and agricultural 4 $ — $ 55 $ 55 Commercial real estate 3 — 249 249 Construction real estate: Commercial 1 63 — 63 Mortgage — — — — Installment — — — — Residential real estate: Commercial — — — — Mortgage 9 — 650 650 HELOC 2 251 88 339 Installment 5 102 13 115 Consumer 50 13 351 364 Total loans 74 $ 429 $ 1,406 $ 1,835 Three Months Ended (In thousands) Number of Contracts Accruing Nonaccrual Total Recorded Investment Commercial, financial and agricultural 6 $ 3,079 $ 1,019 $ 4,098 Commercial real estate 4 — 379 379 Construction real estate: Commercial — — — — Mortgage — — — — Installment — — — — Residential real estate: Commercial 3 — 2,140 2,140 Mortgage 9 — 608 608 HELOC 3 200 6 206 Installment 1 34 — 34 Consumer 57 272 348 620 Total loans 83 $ 3,585 $ 4,500 $ 8,085 Of those loans which were modified and determined to be a TDR during the three -month period ended March 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 three -month period ended March 31, 2017 , $2.6 million were on nonaccrual status as of December 31, 2016 . 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 three-month periods ended March 31, 2018 and March 31, 2017 , respectively. 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. Three Months Ended Three Months Ended (In thousands) Number of Contracts Recorded Investment Number of Contracts Recorded Investment Commercial, financial and agricultural 3 $ 207 6 $ 198 Commercial real estate 1 114 5 838 Construction real estate: Commercial — — — — Mortgage — — — — Installment — — — — Residential real estate: Commercial 1 17 3 49 Mortgage 7 536 8 631 HELOC 3 174 — — Installment — — 1 3 Consumer 41 329 29 268 Leases — — — — Total loans 56 $ 1,377 52 $ 1,987 Of the $1.4 million in modified TDRs which defaulted during the three -month period ended March 31, 2018 , $72,000 were accruing loans and $1.3 million were nonaccrual loans. Of the $2.0 million in modified TDRs which defaulted during the three -month period ended March 31, 2017 , $60,000 were accruing loans and $1.9 million were nonaccrual loans.

Allowance For Loan Losses

Allowance For Loan Losses	3 Months Ended
	Mar. 31, 2018
Allowance for Loan and Lease Losses Write-offs, Net [Abstract]
Allowance For Loan Losses	Allowance for Loan Losses The allowance for loan losses ("ALLL") is that amount management believes is adequate to absorb probable incurred credit losses in the loan portfolio based on management’s evaluation of various factors including overall growth in the loan portfolio, an analysis of individual loans, prior and current loss experience, and current economic conditions. A provision for loan losses is charged to operations based on management’s periodic evaluation of these and other pertinent factors as discussed within Note 1 of the Notes to Consolidated Financial Statements included in Park’s 2017 Annual Report. 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 2017, incorporating net charge-offs plus changes in specific reserves through December 31, 2017. With the addition of 2017 historical losses, management extended the historical loss period to 96 months from 84 months. The 96 -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 2017. • 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 2017. • 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. There was no change to the environmental loss factor during the first quarter of 2018. The activity in the allowance for loan losses for the three -month periods ended March 31, 2018 and March 31, 2017 is summarized in the following tables. Three Months Ended (In thousands) Commercial, financial and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for loan losses: Beginning balance $ 15,022 $ 9,601 $ 4,430 $ 9,321 $ 11,614 $ — $ 49,988 Charge-offs 649 47 — 116 2,638 — 3,450 Recoveries 652 87 59 360 1,013 — 2,171 Net (recoveries)/charge-offs (3 ) (40 ) (59 ) (244 ) 1,625 — 1,279 (Recovery)/provision (948 ) (153 ) (26 ) (150 ) 1,537 — 260 Ending balance $ 14,077 $ 9,488 $ 4,463 $ 9,415 $ 11,526 $ — $ 48,969 Three Months Ended (In thousands) Commercial, financial and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for loan losses: Beginning balance $ 13,434 $ 10,432 $ 5,247 $ 10,958 $ 10,553 $ — $ 50,624 Charge-offs 339 112 27 480 2,750 — 3,708 Recoveries 369 114 58 291 1,298 — 2,130 Net (recoveries)/charge-offs (30 ) (2 ) (31 ) 189 1,452 — 1,578 (Recovery)/provision (27 ) (153 ) (910 ) (24 ) 1,990 — 876 Ending balance $ 13,437 $ 10,281 $ 4,368 $ 10,745 $ 11,091 $ — $ 49,922 Loans collectively evaluated for impairment in the following tables include all performing loans at March 31, 2018 and December 31, 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 March 31, 2018 and December 31, 2017 , which are evaluated for impairment in accordance with U.S. GAAP (see Note 1 of the Notes to Consolidated Financial Statements included in Park’s 2017 Annual Report). The composition of the allowance for loan losses at March 31, 2018 and December 31, 2017 was as follows: March 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 $ 1,165 $ 29 $ 8 $ 5 $ — $ — $ 1,207 Collectively evaluated for impairment 12,912 9,459 4,455 9,410 11,526 — 47,762 Total ending allowance balance $ 14,077 $ 9,488 $ 4,463 $ 9,415 $ 11,526 $ — $ 48,969 Loan balance: Loans individually evaluated for impairment $ 27,045 $ 18,960 $ 1,391 $ 2,896 $ — $ — $ 50,292 Loans collectively evaluated for impairment 973,741 1,137,603 179,793 1,695,764 1,252,251 2,905 5,242,057 Total ending loan balance $ 1,000,786 $ 1,156,563 $ 181,184 $ 1,698,660 $ 1,252,251 $ 2,905 $ 5,292,349 Allowance for loan losses as a percentage of loan balance: Loans individually evaluated for impairment 4.31 % 0.15 % 0.58 % 0.17 % — % — % 2.40 % Loans collectively evaluated for impairment 1.33 % 0.83 % 2.48 % 0.55 % 0.92 % — % 0.91 % Total 1.41 % 0.82 % 2.46 % 0.55 % 0.92 % — % 0.93 % Recorded investment: Loans individually evaluated for impairment $ 27,050 $ 18,983 $ 1,393 $ 2,896 $ — $ — $ 50,322 Loans collectively evaluated for impairment 977,979 1,141,627 180,296 1,699,087 1,255,713 2,951 5,257,653 Total ending recorded investment $ 1,005,029 $ 1,160,610 $ 181,689 $ 1,701,983 $ 1,255,713 $ 2,951 $ 5,307,975 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

Other Real Estate Owned Other R

Other Real Estate Owned Other Real Estate Owned	3 Months Ended
	Mar. 31, 2018
Other Real Estate Owned [Abstract]
Real Estate Owned [Text Block]	Other Real Estate Owned ("OREO") Park typically transfers a loan to OREO at the time that Park takes deed/title to the asset. The carrying amounts of foreclosed properties held at March 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) March 31, 2018 December 31, 2017 OREO: Commercial real estate $ 2,890 $ 7,888 Construction real estate 4,692 4,852 Residential real estate 1,473 1,450 Total OREO $ 9,055 $ 14,190 Loans in process of foreclosure: Residential real estate $ 2,219 $ 2,948

Earnings Per Common Share

Earnings Per Common Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share The following table sets forth the computation of basic and diluted earnings per common share for the three months ended March 31, 2018 and 2017 . Three Months Ended (In thousands, except share and per common share data) 2018 2017 Numerator: Net income $ 31,123 $ 20,267 Denominator: Weighted-average common shares outstanding 15,288,332 15,312,059 Effect of dilutive performance-based restricted stock units 142,996 120,710 Weighted-average common shares outstanding adjusted for the effect of dilutive performance-based restricted stock units 15,431,328 15,432,769 Earnings per common share: Basic earnings per common share $ 2.04 $ 1.32 Diluted earnings per common share $ 2.02 $ 1.31 Park awarded 47,715 and 45,788 PBRSUs to certain employees during the three months ended March 31, 2018 and 2017, respectively. As of March 31, 2018, 139,144 PBRSUs were outstanding. The PBRSUs vest based on service and performance conditions. The dilutive effect of the outstanding PBRSUs was the addition of 142,996 and 120,710 common shares for the three months ended March 31, 2018 and 2017, respectively. Park repurchased 50,000 common shares during the three months ended March 31, 2017 to fund the PBRSUs and common shares awarded to directors of Park and to directors of Park's subsidiary PNB (and its divisions). Park did no t repurchase any common shares during the three months ended March 31, 2018.

Segment Information

Segment Information	3 Months Ended
	Mar. 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 its chartered national bank subsidiary, The Park National Bank (headquartered in Newark, Ohio) (“PNB”), SE Property Holdings, LLC (“SEPH”), and Guardian Financial Services Company (“GFSC”). Management is required 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 the company’s performance, better understand the potential for future cash flows, and make more informed judgments about the company as a whole. Park has three operating segments, 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 three months ended March 31, 2018 (In thousands) PNB GFSC SEPH All Other Total Net interest income $ 61,441 $ 1,305 $ 1,877 $ 227 $ 64,850 (Recovery of) provision for loan losses (67 ) 503 (176 ) — 260 Other income 19,915 30 3,587 3,371 26,903 Other expense 49,001 760 2,025 2,522 54,308 Income before income taxes $ 32,422 $ 72 $ 3,615 $ 1,076 $ 37,185 Federal income tax expense (benefit) 5,677 15 759 (389 ) 6,062 Net income $ 26,745 $ 57 $ 2,856 $ 1,465 $ 31,123 Assets (as of March 31, 2018) $ 7,455,518 $ 30,553 $ 27,726 $ 5,173 $ 7,518,970 Operating Results for the three months ended March 31, 2017 (In thousands) PNB GFSC SEPH All Other Total Net interest income $ 57,480 $ 1,478 $ 201 $ (207 ) $ 58,952 Provision for (recovery of) loan losses 720 437 (281 ) — 876 Other income (loss) 19,114 16 29 (204 ) 18,955 Other expense 45,206 752 805 2,147 48,910 Income (loss) before income taxes $ 30,668 $ 305 $ (294 ) $ (2,558 ) $ 28,121 Federal income tax expense (benefit) 9,182 107 (103 ) (1,332 ) 7,854 Net income (loss) $ 21,486 $ 198 $ (191 ) $ (1,226 ) $ 20,267 Assets (as of March 31, 2017) $ 7,667,288 $ 34,574 $ 24,727 $ 18,101 $ 7,744,690 The operating results of the Parent Company in the “All Other” column are used to reconcile the segment totals to the consolidated condensed statements of income for the three-month periods ended March 31, 2018 and 2017 . The reconciling amounts for consolidated total assets for the periods ended March 31, 2018 and 2017 consisted of the elimination of intersegment borrowings and the assets of the Parent Company which were not eliminated.

Mortgage Loans Held For Sale Mo

Mortgage Loans Held For Sale Mortgage Loans Held for Sale	3 Months Ended
	Mar. 31, 2018
Mortgage Loans Held for Sale [Line Items]
Mortgage Loans Held For Sale Disclosure [Text Block]	Loans Held For Sale Mortgage loans held for sale are carried at their fair value. At March 31, 2018 and December 31, 2017 , respectively, Park had approximately $6.7 million and $4.1 million in mortgage loans held for sale. These amounts are included in loans on the consolidated condensed balance sheets and in the residential real estate loan segments in Note 3 and Note 4. The contractual balance was $6.6 million and $4.1 million at March 31, 2018 and December 31, 2017 , respectively. The gain expected upon sale was $92,000 and $55,000 at March 31, 2018 and December 31, 2017 , respectively. None of these loans were 90 days or more past due or on nonaccrual status as of March 31, 2018 or December 31, 2017 .

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Investment 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. For the three-month periods ended March 31, 2018 and 2017, there were no investment securities deemed to be other-than-temporarily impaired. Investment securities at March 31, 2018 , were as follows: Debt Securities Available-for-Sale (In thousands) Amortized Cost Gross Unrealized Holding Gains Gross Unrealized Holding Losses Estimated Fair Value U.S. Government sponsored entities' asset-backed securities 1,079,745 880 33,715 1,046,910 Total $ 1,079,745 $ 880 $ 33,715 $ 1,046,910 Debt Securities Held-to-Maturity (In thousands) Amortized Cost Gross Gross Estimated Fair Value U.S. Government sponsored entities' asset-backed securities $ 47,767 $ 18 $ 1,246 $ 46,539 Obligations of states and political subdivisions 299,855 3,091 $ 3,286 299,660 Total $ 347,622 $ 3,109 $ 4,532 $ 346,199 Investment securities with unrealized/unrecognized losses at March 31, 2018 , were as follows: Unrealized/unrecognized loss position for less than 12 months Unrealized/unrecognized loss position for 12 months or longer Total (In thousands) Fair value Unrealized/unrecognized losses Fair value Unrealized/unrecognized Fair value Unrealized/unrecognized Debt Securities Available-for-Sale U.S. Government sponsored entities' asset-backed securities 662,276 17,518 $ 294,713 16,197 $ 956,989 33,715 Total $ 662,276 $ 17,518 $ 294,713 $ 16,197 $ 956,989 $ 33,715 Debt Securities Held-to-Maturity U.S. Government sponsored entities' asset-backed securities $ 45,521 $ 1,246 $ — $ — $ 45,521 $ 1,246 Obligations of states and political subdivisions 115,143 $ 1,534 49,748 1,752 $ 164,891 3,286 Total $ 160,664 $ 2,780 $ 49,748 $ 1,752 $ 210,412 $ 4,532 Investment securities at December 31, 2017 , were as follows: Debt Securities Available-for-Sale (In thousands) Amortized Cost Gross Gross Estimated Fair Value 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 Debt Securities Held-to-Maturity (In thousands) Amortized Cost Gross Gross Estimated Fair Value 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 Investment securities with unrealized/unrecognized losses at December 31, 2017 , were as follows: Unrealized/unrecognized loss position for less than 12 months Unrealized/unrecognized loss position for 12 months or longer Total (In thousands) Fair value Unrealized/unrecognized Fair value Unrealized/unrecognized Fair Unrealized/unrecognized 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 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 of the unrealized/unrecognized losses at March 31, 2018 or December 31, 2017 represented other-than-temporary impairment. Should the impairment of any of these securities become other-than-temporary, the cost basis of the investment will be reduced and the resulting loss recognized within net income in the period the other-than-temporary impairment is identified. Park’s U.S. Government sponsored entities' asset-backed securities consist of 15 -year residential mortgage-backed securities and collateralized mortgage obligations. The amortized cost and estimated fair value of investments in debt securities at March 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 of principal repayments. Securities Available-for-Sale (In thousands) Amortized cost Fair value Tax equivalent yield U.S. Government sponsored entities' asset-backed securities $ 1,079,745 $ 1,046,910 2.28 % Securities Held-to-Maturity (In thousands) Amortized cost Fair value Tax equivalent yield (1) Obligations of state and political subdivisions: Due five through ten years $ 2,446 $ 2,420 2.97 % Due over ten years $ 297,409 $ 297,240 3.68 % Total (1) $ 299,855 $ 299,660 3.67 % U.S. Government sponsored entities' asset-backed securities $ 47,767 $ 46,539 2.83 % (1) The tax equivalent yield for obligations of state and political subdivisions includes the effects of a taxable equivalent adjustment using a 21% federal corporate income tax rate. The remaining average life of the entire investment portfolio is estimated to be 4.9 years. During the three months ended March 31, 2018, Park sold certain AFS debt securities with a book value of $247.0 million at a loss of $2.6 million . Additionally, during the three months ended March 31, 2018, Park sold certain HTM debt securities with a book value of $7.4 million at a gain of $291,000 . These HTM securities had been paid down by 96.3% of the principal outstanding at acquisition. There were no sales of investment securities during the three-month period ended March 31, 2017. Investment securities having an amortized cost of $563 million and $557 million at March 31, 2018 and December 31, 2017, respectively, were pledged to collateralize government and trust department deposits in accordance with federal and state requirements, to secure repurchase agreements sold and as collateral for Federal Home Loan Bank ("FHLB") advance borrowings.

Other Investment Securities

Other Investment Securities	3 Months Ended
	Mar. 31, 2018
Other Investment Securities [Abstract]
Other Investment Securities	Other Investment Securities Other investment securities consist of stock investments in the FHLB, the Federal Reserve Bank ("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 condensed statement of income as opposed to in accumulated other comprehensive loss on the consolidated condensed balance sheet. 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 March 31, 2018 and December 31, 2017 was as follows: (In thousands) March 31, 2018 December 31, 2017 FHLB stock $ 50,086 $ 50,086 FRB stock 8,225 8,225 Equity investments carried at fair value 8,924 1,935 Equity investments carried at cost/modified cost (1) 2,589 3,500 Total other investment securities $ 69,824 $ 63,746 (1) There have been no impairments, downward adjustments, or upward adjustments made to equity investments carried at modified cost. During the three months ended March 31, 2018, an equity investment previously carried at cost, with a carrying amount of $3.5 million , was measured at fair value as a readily determinable market value became available. During the three months ended March 31, 2018, $3.5 million of unrealized gains were recorded within "unrealized gain on equity securities" on the consolidated condensed statement of income which relates to investment securities held at March 31, 2018.

Share Based Compensation Share

Share Based Compensation Share Based Compensation	3 Months Ended
	Mar. 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]	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. As of March 31, 2018, there were 92,554 common shares subject to performance-based restricted stock units (“PBRSUs”) issued under the 2013 Incentive Plan, which represented the only awards outstanding 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 March 31, 2018, 703,410 common shares were available for future grants under the 2017 Employees 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 March 31, 2018, 138,850 common shares were available for future grants under the 2017 Non-Employee Director 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 has not granted and 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 the three months ended March 31, 2018, the Compensation Committee of the Board of Directors of Park granted awards of PBRSUs, under the 2017 Employees LTIP, covering an aggregate of 47,715 common shares to certain employees of Park and its subsidiaries. During the three months ended March 31, 2017, the Compensation Committee of the Board of Directors of Park granted awards of PBRSUs, under the 2013 Incentive Plan, covering an aggregate of 45,788 common shares 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 subsequent service-based vesting. A summary of changes in the common shares subject to nonvested PBRSUs for the three months ended March 31, 2018 follows: Common shares subject to PBRSUs Nonvested at January 1, 2018 116,716 Granted 47,715 Vested (18,800 ) Forfeited (4,167 ) Adjustment for performance conditions of PBRSUs (1) (2,320 ) Nonvested at March 31, 2018 139,144 (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. 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 amount of 12,921 common shares being issued to employees of Park. On March 31, 2017, 9,674 of the 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 satisfy employee income tax withholding obligations. This resulted in a net amount of 6,381 common shares being issued to employees of Park. Share-based compensation expense of $1.1 million and $826,000 was recognized for the three-month periods ended March 31, 2018 and 2017, respectively. The following table details expected additional share-based compensation expense related to PBRSUs outstanding as of March 31, 2018: (In thousands) Nine months ending December 31, 2018 $ 2,724 2019 3,098 2020 2,072 2021 846 2022 133 Total $ 8,873

Benefit Plan

Benefit Plan	3 Months Ended
	Mar. 31, 2018
Defined Benefit Plan [Abstract]
Pension Plan	Benefit Plans Park has a noncontributory defined benefit pension plan covering substantially all of its employees. The plan provides benefits based on an employee’s years of service and compensation. There were no pension plan contributions for the three-month periods ended March 31, 2018 and 2017 . The following table shows the components of net periodic benefit income: Three Months Ended Affected Line Item in the Consolidated Condensed Statement of Income (In thousands) 2018 2017 Service cost $ 1,637 $ 1,317 Employee benefits Interest cost 1,309 1,271 Other components of net periodic benefit income Expected return on plan assets (3,354 ) (2,863 ) Other components of net periodic benefit income Amortization of prior service cost — — Other components of net periodic benefit income Recognized net actuarial loss 340 144 Other components of net periodic benefit income Net periodic benefit income $ (68 ) $ (131 ) Park has entered into Supplemental Executive Retirement Plan Agreements (the “SERP Agreements”) with certain key officers of the Corporation and its subsidiaries which provide defined pension benefits in excess of limits imposed by federal tax law. The expense for the Corporation related to the SERP Agreements for the three months ended March 31, 2018 and 2017 was as follows: Three Months Ended Affected Line Item in the Consolidated (In thousands) 2018 2017 Service cost $ 185 $ 233 Employee benefits Interest cost 161 117 Miscellaneous expense Total SERP expense $ 346 $ 350 Previously, the net periodic benefit income/expense related to Park’s Pension and SERP Agreements had been recorded within employee benefits. During the first quarter of 2018, Park adopted ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement . 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. This ASU is required to be applied retrospectively to all periods presented. 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. As a practical expedient, Park used the amounts disclosed in "Note 12 - Pension Plan" of the Notes to Unaudited Consolidated Condensed Financial Statements, included under Item 1 of Part I of Park's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2017 as the estimation basis for applying the retrospective presentation requirements. The following table summarizes the impact of retrospective application of this ASU to the consolidated condensed statement of income for the three months ended March 31, 2017. (in thousands) Three Months Ended Other components of net periodic benefit income As previously reported $ — As reported under new guidance 1,448 Total other income As previously reported $ 17,507 As reported under new guidance 18,955 Employee benefits expense As previously reported $ 5,181 As reported under new guidance 6,468 Miscellaneous expense As previously reported $ 1,495 As reported under new guidance 1,656 Total other expense As previously reported $ 47,462 As reported under new guidance 48,910

Loan Servicing

Loan Servicing	3 Months Ended
	Mar. 31, 2018
Transfers and Servicing of Financial Assets [Abstract]
Loan Servicing	Loan Servicing Park serviced sold mortgage loans of $1.37 billion at both March 31, 2018 and at December 31, 2017 and $1.33 billion at March 31, 2017 . At March 31, 2018 , $2.8 million of the sold mortgage loans were sold with recourse, compared to $3.0 million at December 31, 2017 and $3.6 million at March 31, 2017 . Management closely monitors the delinquency rates on the mortgage loans sold with recourse. At March 31, 2018 and December 31, 2017, management had established reserves of $43,000 and $270,000 , respectively, to account for expected losses on loan repurchases. When Park sells mortgage loans with servicing rights retained, these 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 with respect to the underlying loan. At the end of each reporting period, the carrying value of mortgage servicing rights (“MSRs”) is assessed for impairment with a comparison to fair value. MSRs are carried at the lower of their amortized cost or fair value. The amortization of MSRs is included within other service income in the consolidated condensed statements of income. Activity for MSRs and the related valuation allowance follows: Three Months Ended (In thousands) 2018 2017 Mortgage servicing rights: Carrying amount, net, beginning of period $ 9,688 $ 9,266 Additions 328 354 Amortization (352 ) (358 ) Changes in valuation allowance 305 59 Carrying amount, net, end of period $ 9,969 $ 9,321 Valuation allowance: Beginning of period $ 630 $ 735 Changes in valuation allowance (305 ) (59 ) End of period $ 325 $ 676 Servicing fees included in other service income were $0.9 million for both the three months ended March 31, 2018 and the three months ended March 31, 2017.

Fair Value

Fair Value	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value	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 March 31, 2018 using: (In thousands) Level 1 Level 2 Level 3 Balance at March 31, 2018 Assets Investment securities: U.S. Government sponsored entities’ asset-backed securities $ — $ 1,046,910 $ — $ 1,046,910 Equity securities 8,504 — 420 8,924 Mortgage loans held for sale — 6,703 — 6,703 Mortgage IRLCs — 161 — 161 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 the three months ended March 31, 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 the 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 presents a reconciliation of the beginning and ending balances of the Level 3 inputs for the three months ended March 31, 2018 and 2017 , for financial instruments measured on a recurring basis and classified as Level 3: Level 3 Fair Value Measurements Three months ended March 31, 2018 and 2017 (In thousands) Equity Securities Fair value swap Balance at January 1, 2018 $ 417 $ (226 ) Total gains/(losses) Included in other income 3 — Balance at March 31, 2018 $ 420 $ (226 ) Balance at January 1, 2017 $ 790 $ (226 ) Total gains/(losses) Included in other comprehensive income (14 ) — Balance at March 31, 2017 $ 776 $ (226 ) Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis: The following methods and assumptions were used by the Company in determining the fair value of assets and liabilities measured at fair value on a nonrecurring basis described below: Impaired Loans: At the time a loan is considered impaired, it is valued at the lower of cost or fair value. 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. Other Real Estate Owned ("OREO"): Assets acquired through or in lieu of loan foreclosure are initially recorded at fair value less costs to sell when acquired. The carrying value of OREO is not re-measured to fair value on a recurring basis, but is subject to fair value adjustments when the carrying value exceeds the fair value, less estimated selling costs. Fair value is based on recent real estate appraisals and is updated at least annually. These appraisals may utilize a single valuation approach or a combination of approaches including the comparable sales approach and the income approach. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available. Such adjustments result in a Level 3 classification of the inputs for determining fair value. Appraisals for both collateral dependent impaired loans and OREO are performed by licensed appraisers. Appraisals are generally obtained to support the fair value of collateral. In general, there are three types of appraisals 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% discount is based on historical discounts to appraised values on sold OREO properties. • Income approach appraisals typically incorporate the annual net operating income of the business divided by an appropriate capitalization rate, as determined by the appraiser. Management generally applies a 15% discount to income approach appraised values which management expects will cover all disposition costs (including selling costs). • Lot development loan appraisals are typically performed using a discounted cash flow analysis. Appraisers determine an anticipated absorption period and a discount rate that takes into account an investor’s required rate of return based on recent comparable sales. Management generally applies a 6% discount to lot development appraised values, which is an additional discount above the net present value calculation included in the appraisal, to account for selling costs. MSRs: MSRs are carried at the lower of cost or fair value. MSRs do not trade in active, open markets with readily observable prices. For example, sales of MSRs do occur, but precise terms and conditions typically are not readily available. As such, management, with the assistance of a third-party specialist, determines fair value based on the discounted value of the future cash flows estimated to be received. Significant inputs include the discount rate and assumed prepayment speeds. The calculated fair value is then compared to market values where possible to ascertain the reasonableness of the valuation in relation to current market expectations for similar products. Accordingly, MSRs are classified as Level 2. The following tables present assets and liabilities measured at fair value on a nonrecurring basis. Collateral dependent impaired loans are carried at fair value if they have been charged down to fair value or if a specific valuation allowance has been established. A new cost basis is established at the time a property is initially recorded in OREO. OREO properties are carried at fair value if a devaluation has been taken to the property's value subsequent to the initial measurement. Fair Value Measurements at March 31, 2018 using: (In thousands) Level 1 Level 2 Level 3 Balance at March 31, 2018 Impaired loans recorded at fair value: Commercial real estate $ — $ — $ 3,052 $ 3,052 Construction real estate — — 119 119 Residential real estate — — 696 696 Total impaired loans recorded at fair value $ — $ — $ 3,867 $ 3,867 Mortgage servicing rights $ — $ 1,537 $ — $ 1,537 OREO: Commercial real estate — — 2,295 2,295 Construction real estate — — 3,044 3,044 Residential real estate — — 813 813 Total OREO recorded at fair value $ — $ — $ 6,152 $ 6,152 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 Mortgage servicing rights $ — $ 7,316 $ — $ 7,316 OREO: 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. March 31, 2018 (In thousands) Recorded Investment Prior Charge-Offs Specific Valuation Allowance Carrying Balance Impaired loans recorded at fair value $ 3,908 $ 2,734 $ 41 $ 3,867 Remaining impaired loans 46,414 7,238 1,166 45,248 Total impaired loans $ 50,322 $ 9,972 $ 1,207 $ 49,115 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 from credit adjustments related to impaired loans carried at fair value during the three months ended March 31, 2018 and 2017 was $50,000 and $300,000 , respectively. MSRs totaled $10.0 million at March 31, 2018 . Of this $10.0 million MSR carrying balance, $1.5 million was recorded at fair value and included a valuation allowance of $0.3 million . The remaining $8.5 million was recorded at cost, as the fair value of the MSRs exceeded cost at March 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 . The remaining $2.4 million was recorded at cost, as the fair value exceeded cost at December 31, 2017 . The income related to MSRs carried at fair value during the three months ended March 31, 2018 and 2017 was $305,000 and $59,000 , respectively. Total OREO held by Park at March 31, 2018 and December 31, 2017 was $9.1 million and $14.2 million , respectively. Approximately 68% and 46% of OREO held by Park at March 31, 2018 and December 31, 2017 , respectively, was carried at fair value due to fair value adjustments made subsequent to the initial OREO measurement. At March 31, 2018 and December 31, 2017 , OREO held at fair value, less estimated selling costs, amounted to $6.2 million and $6.5 million , respectively. The net expense related to OREO fair value adjustments was $207,000 and $73,000 for the three -month periods ended March 31, 2018 and 2017 , respectively. The following tables present qualitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis at March 31, 2018 and December 31, 2017 : March 31, 2018 (In thousands) Fair Value Valuation Technique Unobservable Input(s) Range (Weighted Average) Impaired loans: Commercial real estate $ 3,052 Sales comparison approach Adj to comparables 0.0% - 65.7% (23.3%) Income approach Capitalization rate 9.0% - 11.0% (9.9%) Cost approach Accumulated depreciation 90.1% (90.1%) Construction real estate $ 119 Sales comparison approach Adj to comparables 11.1% - 15.2% (13.2%) Residential real estate $ 696 Sales comparison approach Adj to comparables 0.3% - 40.0% (15.8%) 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 $ 3,044 Sales comparison approach Adj to comparables 0.0% - 90.0% (23.7%) Residential real estate $ 813 Sales comparison approach Adj to comparables 1.2% - 79.7% (36.4%) Balance at 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 of 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 condensed balance sheet, and a $922,000 increase to beginning retained earnings. As of March 31, 2018 and December 31, 2017, Park had Partnerships Investments with a NAV of $8.6 million and $8.8 million , respectively. As of March 31, 2018, Park had $7.2 million in unfunded commitments related to these Partnership Investments. The fair value of certain financial instruments at March 31, 2018 and December 31, 2017 , was as follows: March 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 $ 276,581 $ 276,581 $ — $ — $ 276,581 Investment securities (1) 1,394,532 — 1,393,109 — 1,393,109 Other investment securities (2) 8,924 8,504 — 420 8,924 Loans held for sale 6,703 — 6,703 — 6,703 Mortgage IRLCs 161 — 161 — 161 Impaired loans carried at fair value 3,867 — — 3,867 3,867 Other loans, net (3) 5,232,649 — — 5,196,022 5,196,022 Loans receivable, net $ 5,243,380 $ — $ 6,864 $ 5,199,889 $ 5,206,753 Financial liabilities: Time deposits 1,029,785 — 1,028,948 — 1,028,948 Other 2,674 2,674 — — 2,674 Deposits (excluding demand deposits) $ 1,032,459 $ 2,674 $ 1,028,948 $ — $ 1,031,622 Short-term borrowings $ 184,090 $ — $ 184,090 $ — $ 184,090 Long-term debt 425,000 — 425,039 — 425,039 Subordinated notes 15,000 — 13,578 — 13,578 Derivative financial instruments: Fair value swap $ 226 $ — $ — $ 226 $ 226 (1) Includes debt securities AFS and debt securities HTM. (2) Excludes FHLB and FRB stock which are carried at their respective redemption values. Additionally, excludes investment securities accounted for under the measurement guidance for equity securities without readily determinable fair values (Topic 321). (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 debt securities AFS and debt securities HTM. (2) Excludes FHLB and FRB stock which are carried at their respective redemption values. Additionally, excludes investment securities carried at their cost basis as these investments do not have a readily determinable fair value.

Other Comprehensive Income (Los

Other Comprehensive Income (Loss) Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Comprehensive Income (Loss) Note [Text Block]	Other Comprehensive Income (Loss) Other comprehensive income (loss) components, net of income tax, are shown in the following table for the three-month periods ended March 31, 2018 and 2017 : (in thousands) Changes in pension plan assets and benefit obligations Change in unrealized losses on debt securities Total Beginning balance at January 1, 2018 $ (23,526 ) $ (2,928 ) $ (26,454 ) Other comprehensive loss before reclassifications — (23,410 ) (23,410 ) Cumulative effect of change in accounting principle for marketable equity securities, net of tax — (995 ) (995 ) Reclassification of disproportionate income tax effects (3,175 ) (631 ) (3,806 ) Amounts reclassified from accumulated other comprehensive loss — 2,024 2,024 Activity for the period (3,175 ) (23,012 ) (26,187 ) Ending balance at March 31, 2018 $ (26,701 ) $ (25,940 ) $ (52,641 ) Beginning balance at January 1, 2017 $ (14,740 ) $ (3,005 ) $ (17,745 ) Other comprehensive income before reclassifications — 1,022 1,022 Amounts reclassified from accumulated other comprehensive income — — — Net current period other comprehensive income — 1,022 1,022 Ending balance at March 31, 2017 $ (14,740 ) $ (1,983 ) $ (16,723 ) During the three-month period ended March 31, 2018 , there was $2.6 million ( $2.0 million net of tax) reclassified out of accumulated other comprehensive loss due to losses on the sale of AFS debt securities. These losses were recorded within net loss on sale of investment securities on the consolidated condensed statements of income. During the three-month period ended March 31, 2017, there were no reclassifications out of accumulated other comprehensive loss.

Investment in Qualified Afforda

Investment in Qualified Affordable Housing Investment in Qualified Affordable Housing	3 Months Ended
	Mar. 31, 2018
Equity Method Investments and Joint Ventures [Abstract]
Affordable Housing Program [Text Block]	Investment in Qualified Affordable Housing Park makes certain equity investments in various limited partnerships that sponsor affordable housing projects. The purposes of these investments are to achieve a satisfactory return on capital, help create affordable housing opportunities, and assist the Company to achieve our goals associated with the Community Reinvestment Act. The table below details the balances of Park’s affordable housing tax credit investments and related unfunded commitments as of March 31, 2018 and December 31, 2017. (in thousands) March 31, 2018 December 31, 2017 Affordable housing tax credit investments $ 47,818 $ 49,669 Unfunded commitments 14,282 14,282 Commitments are funded when capital calls are made by the general partner. Park expects that the current commitments will be funded between 2018 and 2027. During both the three months ended March 31, 2018 and 2017, Park recognized amortization expense of $1.9 million , which was included within the provision for income taxes. Additionally, during the three months ended March 31, 2018 and 2017, Park recognized tax credits and other benefits from its affordable housing tax credit investments of $2.7 million and $2.4 million , respectively.

Repurchase Agreement Borrowings

Repurchase Agreement Borrowings Repurchase Agreement Borrowings	3 Months Ended
	Mar. 31, 2018
Transfers and Servicing [Abstract]
Repurchase Agreement Borrowings	Repurchase Agreement Borrowings Securities sold under agreements to repurchase ("repurchase agreements") with customers represent funds deposited by customers, generally on an overnight basis, that are collateralized by investment securities owned by Park. Repurchase agreements with customers are included in short-term borrowings on the consolidated condensed balance sheets. All repurchase agreements are subject to terms and conditions of repurchase/security agreements between Park and the client and are accounted for as secured borrowings. Park's repurchase agreements consisted of customer accounts and securities which are pledged on an individual security basis. At March 31, 2018 and December 31, 2017 , Park's repurchase agreement borrowings totaled $184 million and $183 million , respectively. These borrowings were collateralized with U.S. government and agency securities with a carrying value of $207 million and $213 million at March 31, 2018 and December 31, 2017 , respectively. Declines in the value of the collateral would require Park to pledge additional securities. As of March 31, 2018 and December 31, 2017 , Park had $882 million and $975 million , respectively, of available unpledged securities. The table below shows the remaining contractual maturity of repurchase agreements by collateral pledged at March 31, 2018 and December 31, 2017 : March 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 $ 182,986 $ — $ — $ 1,104 $ 184,090 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

Contingent Liabilities Continge

Contingent Liabilities Contingent Liabilities	3 Months Ended
	Mar. 31, 2018
Contingent Liabilities [Abstract]
Schedule of Loss Contingencies by Contingency [Table Text Block]	Contingent Liabilities The Company is a defendant in lawsuits and other adversary proceedings arising in the ordinary course of business. Legal costs incurred in connection with the resolution of claims and lawsuits are generally expensed as incurred, and the Company establishes accruals for the outcome of litigation where losses are deemed probable and reasonably estimable. The Company’s assessment of the current exposure could change in the event of the discovery of additional facts with respect to legal matters pending against the Company or determinations by judges, juries, administrative agencies or other finders of fact that are not in accordance with the Company’s evaluation of claims. As of March 31, 2017, the Company had accrued charges of approximately $2.3 million for legal contingencies related to various legal and other adversary proceedings. This amount was paid out in full settlement of the related litigation during the three months ended September 30, 2017. As of March 31, 2018, the Company had accrued charges of $20,000 for legal contingencies related to various legal and other adversary proceedings.

Revenue from Contracts with Cus

Revenue from Contracts with Customers (Notes)	3 Months Ended
	Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Disaggregation of Revenue [Table 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 Condensed Statements of Income. The following table presents the Corporation's sources of other income by revenue stream and operating segment for the three-month periods ended March 31, 2018 and March 31, 2017 . Three Months Ended Revenue by Operating Segment (in thousands) PNB GFSC SEPH All Other Total Income from fiduciary activities Personal trust and agency accounts $ 2,126 $ — $ — $ — $ 2,126 Employee benefit and retirement-related accounts 1,643 — — — 1,643 Investment management and investment advisory agency accounts 2,244 — — — 2,244 Other 382 — — — 382 Service charges on deposit accounts Non-sufficient funds (NSF) fees 1,834 — — — 1,834 Demand deposit account (DDA) charges 926 — — — 926 Other 162 — — — 162 Other service income (1) Credit card 504 7 — — 511 HELOC 99 — — — 99 Installment 64 — — — 64 Real estate 2,246 — — — 2,246 Commercial 242 — 1,010 — 1,252 Checkcard fee income 4,002 — — — 4,002 Bank owned life insurance income (2) 922 — — 87 1,009 ATM fees 524 — — — 524 OREO valuation adjustments (2) (30 ) — (177 ) — (207 ) Gain on sale of OREO, net 1,585 — 2,736 — 4,321 Net loss on sale of investment securities (2) (2,271 ) — — — (2,271 ) Unrealized gain on equity securities (2) 27 — — 3,462 3,489 Other components of net periodic benefit income (2) 1,652 19 34 — 1,705 Miscellaneous (3) 1,032 4 (16 ) (178 ) 842 Total other income $ 19,915 $ 30 $ 3,587 $ 3,371 $ 26,903 (1) Of the $4.2 million of revenue included within "Other service income", approximately $3.1 million is within the scope of ASC 606, with the remaining $1.1 million consisting primarily of certain credit card and 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 $0.8 million , all of which are within the scope of ASC 606 . Three Months Ended March 31, 2017 (4) Revenue by Operating Segment (in thousands) PNB GFSC SEPH All Other Total Income from fiduciary activities Personal trust and agency accounts $ 1,786 $ — $ — $ — $ 1,786 Employee benefit and retirement-related accounts 1,450 — — — 1,450 Investment management and investment advisory agency accounts 1,968 — — — 1,968 Other 310 — — — 310 Service charges on deposit accounts Non-sufficient funds (NSF) fees 1,985 — — — 1,985 Demand deposit account (DDA) charges 985 — — — 985 Other 169 — — — 169 Other service income Credit card 420 — — — 420 HELOC 91 — — — 91 Installment 158 — — — 158 Real estate 1,812 — — — 1,812 Commercial 323 — — — 323 Checkcard fee income 3,761 — — — 3,761 Bank owned life insurance income (2) 1,007 — — 96 1,103 ATM fees 542 — — — 542 OREO valuation adjustments (2) (73 ) — — — (73 ) Gain on sale of OREO, net 100 — — — 100 Other components of net periodic benefit income (2) 1,403 16 29 — 1,448 Miscellaneous (3) 917 — — (300 ) 617 Total other income $ 19,114 $ 16 $ 29 $ (204 ) $ 18,955 (1) Of the $2.8 million of revenue included within "Other service income", approximately $1.9 million is within the scope of ASC 606, with the remaining $0.9 million consisting primarily of certain credit card and 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 $0.6 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. A description of Park's revenue streams accounted for under ASC 606 includes the following: 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) from 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 debit 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 an executed deed. When Park finances the sale of OREO to the buyer, the Corporation assesses whether the buyer is committed to perform their 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. Three Months Ended Revenue by Operating Segment (in thousands) PNB GFSC SEPH All Other Total Income from fiduciary activities Personal trust and agency accounts $ 2,126 $ — $ — $ — $ 2,126 Employee benefit and retirement-related accounts 1,643 — — — 1,643 Investment management and investment advisory agency accounts 2,244 — — — 2,244 Other 382 — — — 382 Service charges on deposit accounts Non-sufficient funds (NSF) fees 1,834 — — — 1,834 Demand deposit account (DDA) charges 926 — — — 926 Other 162 — — — 162 Other service income (1) Credit card 504 7 — — 511 HELOC 99 — — — 99 Installment 64 — — — 64 Real estate 2,246 — — — 2,246 Commercial 242 — 1,010 — 1,252 Checkcard fee income 4,002 — — — 4,002 Bank owned life insurance income (2) 922 — — 87 1,009 ATM fees 524 — — — 524 OREO valuation adjustments (2) (30 ) — (177 ) — (207 ) Gain on sale of OREO, net 1,585 — 2,736 — 4,321 Net loss on sale of investment securities (2) (2,271 ) — — — (2,271 ) Unrealized gain on equity securities (2) 27 — — 3,462 3,489 Other components of net periodic benefit income (2) 1,652 19 34 — 1,705 Miscellaneous (3) 1,032 4 (16 ) (178 ) 842 Total other income $ 19,915 $ 30 $ 3,587 $ 3,371 $ 26,903 (1) Of the $4.2 million of revenue included within "Other service income", approximately $3.1 million is within the scope of ASC 606, with the remaining $1.1 million consisting primarily of certain credit card and 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 $0.8 million , all of which are within the scope of ASC 606 . Three Months Ended March 31, 2017 (4) Revenue by Operating Segment (in thousands) PNB GFSC SEPH All Other Total Income from fiduciary activities Personal trust and agency accounts $ 1,786 $ — $ — $ — $ 1,786 Employee benefit and retirement-related accounts 1,450 — — — 1,450 Investment management and investment advisory agency accounts 1,968 — — — 1,968 Other 310 — — — 310 Service charges on deposit accounts Non-sufficient funds (NSF) fees 1,985 — — — 1,985 Demand deposit account (DDA) charges 985 — — — 985 Other 169 — — — 169 Other service income Credit card 420 — — — 420 HELOC 91 — — — 91 Installment 158 — — — 158 Real estate 1,812 — — — 1,812 Commercial 323 — — — 323 Checkcard fee income 3,761 — — — 3,761 Bank owned life insurance income (2) 1,007 — — 96 1,103 ATM fees 542 — — — 542 OREO valuation adjustments (2) (73 ) — — — (73 ) Gain on sale of OREO, net 100 — — — 100 Other components of net periodic benefit income (2) 1,403 16 29 — 1,448 Miscellaneous (3) 917 — — (300 ) 617 Total other income $ 19,114 $ 16 $ 29 $ (204 ) $ 18,955 (1) Of the $2.8 million of revenue included within "Other service income", approximately $1.9 million is within the scope of ASC 606, with the remaining $0.9 million consisting primarily of certain credit card and 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 $0.6 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.

Subsequent events Subsequent ev

Subsequent events Subsequent events	3 Months Ended
	Mar. 31, 2018
Subsequent Event [Line Items]
Subsequent Events [Text Block]	Subsequent Events On April 20, 2018, the Park Board of Directors declared a $0.96 per common share quarterly cash dividend in respect of Park's common shares and a $0.25 per common share special cash dividend in respect of Park's common shares. The dividends are payable on June 8, 2018 to common shareholders of record as of the close of business on May 18, 2018.

Loans (Tables)

Loans (Tables)	3 Months Ended
	Mar. 31, 2018
Loans and Leases Receivable Disclosure [Abstract]
Composition Of Loan Portfolio By Class Of Loan	The composition of the loan portfolio, by class of loan, as of March 31, 2018 and December 31, 2017 was as follows: March 31, 2018 December 31, 2017 (In thousands) Loan Balance Accrued Interest Receivable Recorded Investment Loan Balance Accrued Interest Receivable Recorded Investment Commercial, financial and agricultural * $ 1,000,786 $ 4,243 $ 1,005,029 $ 1,053,453 $ 4,413 $ 1,057,866 Commercial real estate * 1,156,563 4,047 1,160,610 1,167,607 4,283 1,171,890 Construction real estate: Commercial 126,561 375 126,936 125,389 401 125,790 Mortgage 51,379 119 51,498 52,203 133 52,336 Installment 3,244 11 3,255 3,878 13 3,891 Residential real estate: Commercial 389,766 1,043 390,809 393,094 1,029 394,123 Mortgage 1,097,166 1,327 1,098,493 1,110,426 1,516 1,111,942 HELOC 194,158 904 195,062 203,178 974 204,152 Installment 17,570 49 17,619 18,526 53 18,579 Consumer 1,252,251 3,462 1,255,713 1,241,736 3,808 1,245,544 Leases 2,905 46 2,951 2,993 36 3,029 Total loans $ 5,292,349 $ 15,626 $ 5,307,975 $ 5,372,483 $ 16,659 $ 5,389,142 * Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class.
Recorded Investment In Nonaccrual Restructured And Loans Past Due 90 Days Or More And Accruing	The following tables present the recorded investment in nonaccrual loans, accruing troubled debt restructurings ("TDRs"), and loans past due 90 days or more and still accruing by class of loan as of March 31, 2018 and December 31, 2017 : March 31, 2018 (In thousands) Nonaccrual Loans Accruing TDRs Loans Past Due 90 Days or More and Accruing Total Nonperforming Loans Commercial, financial and agricultural $ 25,985 $ 1,088 $ — $ 27,073 Commercial real estate 14,213 4,770 — 18,983 Construction real estate: Commercial 960 433 — 1,393 Mortgage — 16 — 16 Installment 43 6 — 49 Residential real estate: Commercial 2,674 222 — 2,896 Mortgage 16,856 10,022 669 27,547 HELOC 1,482 882 47 2,411 Installment 527 695 — 1,222 Consumer 3,411 623 690 4,724 Total loans $ 66,151 $ 18,757 $ 1,406 $ 86,314 December 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
Loans Individually And Collectively Evaluated For Impairment	The following table provides additional information regarding those nonaccrual loans and accruing TDR loans that were individually evaluated for impairment and those collectively evaluated for impairment, as of March 31, 2018 and December 31, 2017 . March 31, 2018 December 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 $ 27,073 $ 27,050 $ 23 $ 18,064 $ 18,039 $ 25 Commercial real estate 18,983 18,983 — 18,142 18,142 — Construction real estate: Commercial 1,393 1,393 — 1,324 1,324 — Mortgage 16 — 16 100 — 100 Installment 49 — 49 52 — 52 Residential real estate: Commercial 2,896 2,896 — 19,059 19,059 — Mortgage 26,878 — 26,878 27,607 — 27,607 HELOC 2,364 — 2,364 2,618 — 2,618 Installment 1,222 — 1,222 1,202 — 1,202 Consumer 4,034 — 4,034 4,065 — 4,065 Total loans $ 84,908 $ 50,322 $ 34,586 $ 92,233 $ 56,564 $ 35,669
Loans Individually Evaluated For Impairment By Class Of Loans	The following table presents loans individually evaluated for impairment by class of loan, together with the related allowance recorded, as of March 31, 2018 and December 31, 2017 . March 31, 2018 December 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 $ 27,201 $ 22,255 $ — $ 19,899 $ 14,704 $ — Commercial real estate 18,370 17,901 — 18,974 18,060 — Construction real estate: Commercial 1,264 1,265 — 2,788 1,324 — Residential real estate: Commercial 3,107 2,786 — 19,346 19,012 — With an allowance recorded: Commercial, financial and agricultural 7,082 4,795 1,165 5,394 3,335 681 Commercial real estate 1,524 1,082 29 137 82 2 Construction real estate: Commercial 1,592 128 8 — — — Residential real estate: Commercial 123 110 5 47 47 1 Consumer — — — — — — Total $ 60,263 $ 50,322 $ 1,207 $ 66,585 $ 56,564 $ 684
Average Recorded Investment And Interest Income Recognized On Loans Individually Evaluated For Impairment	The following table presents the average recorded investment and interest income recognized subsequent to impairment on loans individually evaluated for impairment as of and for the three months ended March 31, 2018 and March 31, 2017 : Three Months Ended Three Months Ended (In thousands) Recorded Investment as of March 31, 2018 Average Recorded Investment Interest Income Recognized Recorded Investment as of March 31, 2017 Average Recorded Investment Interest Income Recognized Commercial, financial and agricultural $ 27,050 $ 20,078 $ 174 $ 22,542 $ 19,471 $ 220 Commercial real estate 18,983 18,193 202 22,732 23,297 231 Construction real estate: Commercial 1,393 1,377 14 2,041 2,096 15 Residential real estate: Commercial 2,896 11,215 31 22,803 23,081 345 Consumer — — — 9 5 — Total $ 50,322 $ 50,863 $ 421 $ 70,127 $ 67,950 $ 811
Aging Of Recorded Investment In Past Due Loans	The following tables present the aging of the recorded investment in past due loans as of March 31, 2018 and December 31, 2017 by class of loan. March 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 $ 1,483 $ 13,100 $ 14,583 $ 990,446 $ 1,005,029 Commercial real estate 210 2,748 2,958 1,157,652 1,160,610 Construction real estate: Commercial — — — 126,936 126,936 Mortgage 84 — 84 51,414 51,498 Installment 49 3 52 3,203 3,255 Residential real estate: Commercial 413 1,023 1,436 389,373 390,809 Mortgage 9,465 8,010 17,475 1,081,018 1,098,493 HELOC 570 729 1,299 193,763 195,062 Installment 268 215 483 17,136 17,619 Consumer 7,567 1,798 9,365 1,246,348 1,255,713 Leases — — — 2,951 2,951 Total loans $ 20,109 $ 27,626 $ 47,735 $ 5,260,240 $ 5,307,975 (1) Includes $1.4 million of loans past due 90 days or more and accruing. The remaining loans were past due nonaccrual loans. (2) Includes $39.9 million of nonaccrual loans which were current in regards to contractual principal and interest payments. December 31, 2017 (in thousands) Accruing Loans Past Due 30-89 Days Past Due (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 $1.8 million of loans past due 90 days or more and accruing. The remaining loans were past due nonaccrual loans. (2) Includes $56.1 million of nonaccrual loans which were current in regards to contractual principal and interest payments.
Recorded Investment By Loan Grade	The tables below present the recorded investment by loan grade at March 31, 2018 and December 31, 2017 for all commercial loans: March 31, 2018 (In thousands) 5 Rated 6 Rated Nonaccrual and Accruing TDRs Pass-Rated Recorded Investment Commercial, financial and agricultural * $ 475 $ 130 $ 27,073 $ 977,351 $ 1,005,029 Commercial real estate * 2,176 — 18,983 1,139,451 1,160,610 Construction real estate: Commercial — 344 1,393 125,199 126,936 Residential real estate: Commercial 412 — 2,896 387,501 390,809 Leases — — — 2,951 2,951 Total commercial loans $ 3,063 $ 474 $ 50,345 $ 2,632,453 $ 2,686,335 * Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class. December 31, 2017 (In thousands) 5 Rated 6 Rated Nonaccrual and Accruing TDRs 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
TDR Number Of Contracts Modified And Recorded Investment	The following tables detail the number of contracts modified as TDRs during the three -month periods ended March 31, 2018 and March 31, 2017 , as well as the recorded investment of these contracts at March 31, 2018 and March 31, 2017 . The recorded investment pre- and post-modification is generally the same due to the fact that Park does not typically forgive principal. Three Months Ended (In thousands) Number of Contracts Accruing Nonaccrual Total Recorded Investment Commercial, financial and agricultural 4 $ — $ 55 $ 55 Commercial real estate 3 — 249 249 Construction real estate: Commercial 1 63 — 63 Mortgage — — — — Installment — — — — Residential real estate: Commercial — — — — Mortgage 9 — 650 650 HELOC 2 251 88 339 Installment 5 102 13 115 Consumer 50 13 351 364 Total loans 74 $ 429 $ 1,406 $ 1,835 Three Months Ended (In thousands) Number of Contracts Accruing Nonaccrual Total Recorded Investment Commercial, financial and agricultural 6 $ 3,079 $ 1,019 $ 4,098 Commercial real estate 4 — 379 379 Construction real estate: Commercial — — — — Mortgage — — — — Installment — — — — Residential real estate: Commercial 3 — 2,140 2,140 Mortgage 9 — 608 608 HELOC 3 200 6 206 Installment 1 34 — 34 Consumer 57 272 348 620 Total loans 83 $ 3,585 $ 4,500 $ 8,085 Of those loans which were modified and determined to be a TDR during the three -month period ended March 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 three -month period ended March 31, 2017 , $2.6 million were on nonaccrual status as of December 31, 2016 .
Recorded Investment In Financing Receivable Modified As TDR Within 12 Months	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 three-month periods ended March 31, 2018 and March 31, 2017 , respectively. 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. Three Months Ended Three Months Ended (In thousands) Number of Contracts Recorded Investment Number of Contracts Recorded Investment Commercial, financial and agricultural 3 $ 207 6 $ 198 Commercial real estate 1 114 5 838 Construction real estate: Commercial — — — — Mortgage — — — — Installment — — — — Residential real estate: Commercial 1 17 3 49 Mortgage 7 536 8 631 HELOC 3 174 — — Installment — — 1 3 Consumer 41 329 29 268 Leases — — — — Total loans 56 $ 1,377 52 $ 1,987 Of the $1.4 million in modified TDRs which defaulted during the three -month period ended March 31, 2018 , $72,000 were accruing loans and $1.3 million were nonaccrual loans. Of the $2.0 million in modified TDRs which defaulted during the three -month period ended March 31, 2017 , $60,000 were accruing loans and $1.9 million were nonaccrual loans.

Allowance For Loan Losses (Tabl

Allowance For Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2018
Allowance for Loan and Lease Losses Write-offs, Net [Abstract]
Activity In The Allowance For Loan Losses	The activity in the allowance for loan losses for the three -month periods ended March 31, 2018 and March 31, 2017 is summarized in the following tables. Three Months Ended (In thousands) Commercial, financial and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for loan losses: Beginning balance $ 15,022 $ 9,601 $ 4,430 $ 9,321 $ 11,614 $ — $ 49,988 Charge-offs 649 47 — 116 2,638 — 3,450 Recoveries 652 87 59 360 1,013 — 2,171 Net (recoveries)/charge-offs (3 ) (40 ) (59 ) (244 ) 1,625 — 1,279 (Recovery)/provision (948 ) (153 ) (26 ) (150 ) 1,537 — 260 Ending balance $ 14,077 $ 9,488 $ 4,463 $ 9,415 $ 11,526 $ — $ 48,969 Three Months Ended (In thousands) Commercial, financial and agricultural Commercial real estate Construction real estate Residential real estate Consumer Leases Total Allowance for loan losses: Beginning balance $ 13,434 $ 10,432 $ 5,247 $ 10,958 $ 10,553 $ — $ 50,624 Charge-offs 339 112 27 480 2,750 — 3,708 Recoveries 369 114 58 291 1,298 — 2,130 Net (recoveries)/charge-offs (30 ) (2 ) (31 ) 189 1,452 — 1,578 (Recovery)/provision (27 ) (153 ) (910 ) (24 ) 1,990 — 876 Ending balance $ 13,437 $ 10,281 $ 4,368 $ 10,745 $ 11,091 $ — $ 49,922
Composition Of The Allowance For Loan Losses	The composition of the allowance for loan losses at March 31, 2018 and December 31, 2017 was as follows: March 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 $ 1,165 $ 29 $ 8 $ 5 $ — $ — $ 1,207 Collectively evaluated for impairment 12,912 9,459 4,455 9,410 11,526 — 47,762 Total ending allowance balance $ 14,077 $ 9,488 $ 4,463 $ 9,415 $ 11,526 $ — $ 48,969 Loan balance: Loans individually evaluated for impairment $ 27,045 $ 18,960 $ 1,391 $ 2,896 $ — $ — $ 50,292 Loans collectively evaluated for impairment 973,741 1,137,603 179,793 1,695,764 1,252,251 2,905 5,242,057 Total ending loan balance $ 1,000,786 $ 1,156,563 $ 181,184 $ 1,698,660 $ 1,252,251 $ 2,905 $ 5,292,349 Allowance for loan losses as a percentage of loan balance: Loans individually evaluated for impairment 4.31 % 0.15 % 0.58 % 0.17 % — % — % 2.40 % Loans collectively evaluated for impairment 1.33 % 0.83 % 2.48 % 0.55 % 0.92 % — % 0.91 % Total 1.41 % 0.82 % 2.46 % 0.55 % 0.92 % — % 0.93 % Recorded investment: Loans individually evaluated for impairment $ 27,050 $ 18,983 $ 1,393 $ 2,896 $ — $ — $ 50,322 Loans collectively evaluated for impairment 977,979 1,141,627 180,296 1,699,087 1,255,713 2,951 5,257,653 Total ending recorded investment $ 1,005,029 $ 1,160,610 $ 181,689 $ 1,701,983 $ 1,255,713 $ 2,951 $ 5,307,975 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

Other Real Estate Owned Other32

Other Real Estate Owned Other Real Estate Owned (Tables)	3 Months Ended
	Mar. 31, 2018
Other Real Estate Owned [Abstract]
Schedule of Assets Repossessed or Foreclosed, or loans in process of foreclosure [Table Text Block] [Text Block]	Park typically transfers a loan to OREO at the time that Park takes deed/title to the asset. The carrying amounts of foreclosed properties held at March 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) March 31, 2018 December 31, 2017 OREO: Commercial real estate $ 2,890 $ 7,888 Construction real estate 4,692 4,852 Residential real estate 1,473 1,450 Total OREO $ 9,055 $ 14,190 Loans in process of foreclosure: Residential real estate $ 2,219 $ 2,948

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Summary 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 for the three months ended March 31, 2018 and 2017 . Three Months Ended (In thousands, except share and per common share data) 2018 2017 Numerator: Net income $ 31,123 $ 20,267 Denominator: Weighted-average common shares outstanding 15,288,332 15,312,059 Effect of dilutive performance-based restricted stock units 142,996 120,710 Weighted-average common shares outstanding adjusted for the effect of dilutive performance-based restricted stock units 15,431,328 15,432,769 Earnings per common share: Basic earnings per common share $ 2.04 $ 1.32 Diluted earnings per common share $ 2.02 $ 1.31

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Schedule Of Operating Results By Segment	Operating Results for the three months ended March 31, 2018 (In thousands) PNB GFSC SEPH All Other Total Net interest income $ 61,441 $ 1,305 $ 1,877 $ 227 $ 64,850 (Recovery of) provision for loan losses (67 ) 503 (176 ) — 260 Other income 19,915 30 3,587 3,371 26,903 Other expense 49,001 760 2,025 2,522 54,308 Income before income taxes $ 32,422 $ 72 $ 3,615 $ 1,076 $ 37,185 Federal income tax expense (benefit) 5,677 15 759 (389 ) 6,062 Net income $ 26,745 $ 57 $ 2,856 $ 1,465 $ 31,123 Assets (as of March 31, 2018) $ 7,455,518 $ 30,553 $ 27,726 $ 5,173 $ 7,518,970 Operating Results for the three months ended March 31, 2017 (In thousands) PNB GFSC SEPH All Other Total Net interest income $ 57,480 $ 1,478 $ 201 $ (207 ) $ 58,952 Provision for (recovery of) loan losses 720 437 (281 ) — 876 Other income (loss) 19,114 16 29 (204 ) 18,955 Other expense 45,206 752 805 2,147 48,910 Income (loss) before income taxes $ 30,668 $ 305 $ (294 ) $ (2,558 ) $ 28,121 Federal income tax expense (benefit) 9,182 107 (103 ) (1,332 ) 7,854 Net income (loss) $ 21,486 $ 198 $ (191 ) $ (1,226 ) $ 20,267 Assets (as of March 31, 2017) $ 7,667,288 $ 34,574 $ 24,727 $ 18,101 $ 7,744,690

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Schedule Of Investment Securities	Investment securities at December 31, 2017 , were as follows: Debt Securities Available-for-Sale (In thousands) Amortized Cost Gross Gross Estimated Fair Value 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 Debt Securities Held-to-Maturity (In thousands) Amortized Cost Gross Gross Estimated Fair Value 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 Investment securities at March 31, 2018 , were as follows: Debt Securities Available-for-Sale (In thousands) Amortized Cost Gross Unrealized Holding Gains Gross Unrealized Holding Losses Estimated Fair Value U.S. Government sponsored entities' asset-backed securities 1,079,745 880 33,715 1,046,910 Total $ 1,079,745 $ 880 $ 33,715 $ 1,046,910 Debt Securities Held-to-Maturity (In thousands) Amortized Cost Gross Gross Estimated Fair Value U.S. Government sponsored entities' asset-backed securities $ 47,767 $ 18 $ 1,246 $ 46,539 Obligations of states and political subdivisions 299,855 3,091 $ 3,286 299,660 Total $ 347,622 $ 3,109 $ 4,532 $ 346,199
Schedule Of Unrealized Loss On Securities	Investment securities with unrealized/unrecognized losses at March 31, 2018 , were as follows: Unrealized/unrecognized loss position for less than 12 months Unrealized/unrecognized loss position for 12 months or longer Total (In thousands) Fair value Unrealized/unrecognized losses Fair value Unrealized/unrecognized Fair value Unrealized/unrecognized Debt Securities Available-for-Sale U.S. Government sponsored entities' asset-backed securities 662,276 17,518 $ 294,713 16,197 $ 956,989 33,715 Total $ 662,276 $ 17,518 $ 294,713 $ 16,197 $ 956,989 $ 33,715 Debt Securities Held-to-Maturity U.S. Government sponsored entities' asset-backed securities $ 45,521 $ 1,246 $ — $ — $ 45,521 $ 1,246 Obligations of states and political subdivisions 115,143 $ 1,534 49,748 1,752 $ 164,891 3,286 Total $ 160,664 $ 2,780 $ 49,748 $ 1,752 $ 210,412 $ 4,532 Investment securities with unrealized/unrecognized losses at December 31, 2017 , were as follows: Unrealized/unrecognized loss position for less than 12 months Unrealized/unrecognized loss position for 12 months or longer Total (In thousands) Fair value Unrealized/unrecognized Fair value Unrealized/unrecognized Fair Unrealized/unrecognized 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 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
Amortized Cost And Estimated Fair Value Of Investments In Debt Securities By Contractual Maturity	The amortized cost and estimated fair value of investments in debt securities at March 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 of principal repayments. Securities Available-for-Sale (In thousands) Amortized cost Fair value Tax equivalent yield U.S. Government sponsored entities' asset-backed securities $ 1,079,745 $ 1,046,910 2.28 % Securities Held-to-Maturity (In thousands) Amortized cost Fair value Tax equivalent yield (1) Obligations of state and political subdivisions: Due five through ten years $ 2,446 $ 2,420 2.97 % Due over ten years $ 297,409 $ 297,240 3.68 % Total (1) $ 299,855 $ 299,660 3.67 % U.S. Government sponsored entities' asset-backed securities $ 47,767 $ 46,539 2.83 %

Other Investment Securities (Ta

Other Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2018
Other Investment Securities [Abstract]
Schedule Of Other Investment Securities	The carrying amount of other investment securities at March 31, 2018 and December 31, 2017 was as follows: (In thousands) March 31, 2018 December 31, 2017 FHLB stock $ 50,086 $ 50,086 FRB stock 8,225 8,225 Equity investments carried at fair value 8,924 1,935 Equity investments carried at cost/modified cost (1) 2,589 3,500 Total other investment securities $ 69,824 $ 63,746 (1) There have been no impairments, downward adjustments, or upward adjustments made to equity investments carried at modified cost.

Share Based Compensation Shar37

Share Based Compensation Share Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]	A summary of changes in the common shares subject to nonvested PBRSUs for the three months ended March 31, 2018 follows: Common shares subject to PBRSUs Nonvested at January 1, 2018 116,716 Granted 47,715 Vested (18,800 ) Forfeited (4,167 ) Adjustment for performance conditions of PBRSUs (1) (2,320 ) Nonvested at March 31, 2018 139,144
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]	The following table details expected additional share-based compensation expense related to PBRSUs outstanding as of March 31, 2018: (In thousands) Nine months ending December 31, 2018 $ 2,724 2019 3,098 2020 2,072 2021 846 2022 133 Total $ 8,873

Benefit Plan (Tables)

Benefit Plan (Tables)	3 Months Ended
	Mar. 31, 2018
Defined Benefit Plan [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]	Adoption of New Accounting Pronouncements and Issued Not Yet Effective Accounting Standards The following is a summary of new accounting pronouncements impacting Park's consolidated financial statements, and issued 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 first quarter 2018 Form 10-Q. Reference Note 19, 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 to the current U.S. GAAP model primarily affect the accounting for equity investments, financial liabilities under the fair value option, and the presentation and disclosure requirements for financial instruments. In addition, this ASU clarifies guidance related to the valuation allowance assessment when recognizing deferred tax assets resulting from unrealized losses on available-for-sale ("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 an $1.9 million increase to beginning retained earnings and a $995,000 increase to beginning accumulated other comprehensive loss. Additional income of $3.2 million was recorded in the first quarter of 2018 as a result of changes to the accounting for equity investments. Further, beginning with the first quarter of 2018, Park's fair value disclosures in Note 14 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 12 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 in 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 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 newly - enacted federal corporate income tax rate. 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 on 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 on January 1, 2018. Issued 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. Early adoption is permitted. Management is currently analyzing data on leased assets. The adoption of this guidance is expected to increase both assets and liabilities, but is not expected to have a material impact on Park's consolidated statement of income. ASU 2016-13 - 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, held-to-maturity ("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 implementing a software solution to assist in the adoption of this ASU. Management plans to run our current allowance model and a CECL model concurrently for 12 months prior to the adoption of this guidance on January 1, 2020. 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 U.S. 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. Early adoption is permitted for interim or annual periods. The adoption of this guidance is not expected to have a material impact on 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 adoption of this guidance is not expected to have a material impact on Park's consolidated financial statements. Park is considering the early adoption of this guidance. The following table summarizes the impact of retrospective application of this ASU to the consolidated condensed statement of income for the three months ended March 31, 2017. (in thousands) Three Months Ended Other components of net periodic benefit income As previously reported $ — As reported under new guidance 1,448 Total other income As previously reported $ 17,507 As reported under new guidance 18,955 Employee benefits expense As previously reported $ 5,181 As reported under new guidance 6,468 Miscellaneous expense As previously reported $ 1,495 As reported under new guidance 1,656 Total other expense As previously reported $ 47,462 As reported under new guidance 48,910
Components Of Net Periodic Benefit Expense	The following table shows the components of net periodic benefit income: Three Months Ended Affected Line Item in the Consolidated Condensed Statement of Income (In thousands) 2018 2017 Service cost $ 1,637 $ 1,317 Employee benefits Interest cost 1,309 1,271 Other components of net periodic benefit income Expected return on plan assets (3,354 ) (2,863 ) Other components of net periodic benefit income Amortization of prior service cost — — Other components of net periodic benefit income Recognized net actuarial loss 340 144 Other components of net periodic benefit income Net periodic benefit income $ (68 ) $ (131 ) Park has entered into Supplemental Executive Retirement Plan Agreements (the “SERP Agreements”) with certain key officers of the Corporation and its subsidiaries which provide defined pension benefits in excess of limits imposed by federal tax law. The expense for the Corporation related to the SERP Agreements for the three months ended March 31, 2018 and 2017 was as follows: Three Months Ended Affected Line Item in the Consolidated (In thousands) 2018 2017 Service cost $ 185 $ 233 Employee benefits Interest cost 161 117 Miscellaneous expense Total SERP expense $ 346 $ 350

Loan Servicing (Tables)

Loan Servicing (Tables)	3 Months Ended
	Mar. 31, 2018
Transfers and Servicing of Financial Assets [Abstract]
Activity For MSRs And Related Valuation Allowance	Activity for MSRs and the related valuation allowance follows: Three Months Ended (In thousands) 2018 2017 Mortgage servicing rights: Carrying amount, net, beginning of period $ 9,688 $ 9,266 Additions 328 354 Amortization (352 ) (358 ) Changes in valuation allowance 305 59 Carrying amount, net, end of period $ 9,969 $ 9,321 Valuation allowance: Beginning of period $ 630 $ 735 Changes in valuation allowance (305 ) (59 ) End of period $ 325 $ 676

Fair Value (Tables)

Fair Value (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
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 March 31, 2018 using: (In thousands) Level 1 Level 2 Level 3 Balance at March 31, 2018 Assets Investment securities: U.S. Government sponsored entities’ asset-backed securities $ — $ 1,046,910 $ — $ 1,046,910 Equity securities 8,504 — 420 8,924 Mortgage loans held for sale — 6,703 — 6,703 Mortgage IRLCs — 161 — 161 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
Reconciliation Of Level 3 Input For Financial Instruments Measured On Recurring Basis	The table below presents a reconciliation of the beginning and ending balances of the Level 3 inputs for the three months ended March 31, 2018 and 2017 , for financial instruments measured on a recurring basis and classified as Level 3: Level 3 Fair Value Measurements Three months ended March 31, 2018 and 2017 (In thousands) Equity Securities Fair value swap Balance at January 1, 2018 $ 417 $ (226 ) Total gains/(losses) Included in other income 3 — Balance at March 31, 2018 $ 420 $ (226 ) Balance at January 1, 2017 $ 790 $ (226 ) Total gains/(losses) Included in other comprehensive income (14 ) — Balance at March 31, 2017 $ 776 $ (226 )
Assets And Liabilities Measured At Fair Value On A Nonrecurring Basis	The following tables present assets and liabilities measured at fair value on a nonrecurring basis. Collateral dependent impaired loans are carried at fair value if they have been charged down to fair value or if a specific valuation allowance has been established. A new cost basis is established at the time a property is initially recorded in OREO. OREO properties are carried at fair value if a devaluation has been taken to the property's value subsequent to the initial measurement. Fair Value Measurements at March 31, 2018 using: (In thousands) Level 1 Level 2 Level 3 Balance at March 31, 2018 Impaired loans recorded at fair value: Commercial real estate $ — $ — $ 3,052 $ 3,052 Construction real estate — — 119 119 Residential real estate — — 696 696 Total impaired loans recorded at fair value $ — $ — $ 3,867 $ 3,867 Mortgage servicing rights $ — $ 1,537 $ — $ 1,537 OREO: Commercial real estate — — 2,295 2,295 Construction real estate — — 3,044 3,044 Residential real estate — — 813 813 Total OREO recorded at fair value $ — $ — $ 6,152 $ 6,152 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 Mortgage servicing rights $ — $ 7,316 $ — $ 7,316 OREO: 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 Impaired Financing Receivables Additional Information [Line Items]
Schedule of impaired financing receivables additional info [Abstract]	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. March 31, 2018 (In thousands) Recorded Investment Prior Charge-Offs Specific Valuation Allowance Carrying Balance Impaired loans recorded at fair value $ 3,908 $ 2,734 $ 41 $ 3,867 Remaining impaired loans 46,414 7,238 1,166 45,248 Total impaired loans $ 50,322 $ 9,972 $ 1,207 $ 49,115 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
Qualitative Information about Level 3 Fair Value Measurements Measured on Non-Recurring Basis	The following tables present qualitative information about Level 3 fair value measurements for financial instruments measured at fair value on a nonrecurring basis at March 31, 2018 and December 31, 2017 : March 31, 2018 (In thousands) Fair Value Valuation Technique Unobservable Input(s) Range (Weighted Average) Impaired loans: Commercial real estate $ 3,052 Sales comparison approach Adj to comparables 0.0% - 65.7% (23.3%) Income approach Capitalization rate 9.0% - 11.0% (9.9%) Cost approach Accumulated depreciation 90.1% (90.1%) Construction real estate $ 119 Sales comparison approach Adj to comparables 11.1% - 15.2% (13.2%) Residential real estate $ 696 Sales comparison approach Adj to comparables 0.3% - 40.0% (15.8%) 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 $ 3,044 Sales comparison approach Adj to comparables 0.0% - 90.0% (23.7%) Residential real estate $ 813 Sales comparison approach Adj to comparables 1.2% - 79.7% (36.4%) Balance at 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 certain financial instruments at March 31, 2018 and December 31, 2017 , was as follows: March 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 $ 276,581 $ 276,581 $ — $ — $ 276,581 Investment securities (1) 1,394,532 — 1,393,109 — 1,393,109 Other investment securities (2) 8,924 8,504 — 420 8,924 Loans held for sale 6,703 — 6,703 — 6,703 Mortgage IRLCs 161 — 161 — 161 Impaired loans carried at fair value 3,867 — — 3,867 3,867 Other loans, net (3) 5,232,649 — — 5,196,022 5,196,022 Loans receivable, net $ 5,243,380 $ — $ 6,864 $ 5,199,889 $ 5,206,753 Financial liabilities: Time deposits 1,029,785 — 1,028,948 — 1,028,948 Other 2,674 2,674 — — 2,674 Deposits (excluding demand deposits) $ 1,032,459 $ 2,674 $ 1,028,948 $ — $ 1,031,622 Short-term borrowings $ 184,090 $ — $ 184,090 $ — $ 184,090 Long-term debt 425,000 — 425,039 — 425,039 Subordinated notes 15,000 — 13,578 — 13,578 Derivative financial instruments: Fair value swap $ 226 $ — $ — $ 226 $ 226 (1) Includes debt securities AFS and debt securities HTM. (2) Excludes FHLB and FRB stock which are carried at their respective redemption values. Additionally, excludes investment securities accounted for under the measurement guidance for equity securities without readily determinable fair values (Topic 321). (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 debt securities AFS and debt securities HTM. (2) Excludes FHLB and FRB stock which are carried at their respective redemption values. Additionally, excludes investment securities carried at their cost basis as these investments do not have a readily determinable fair value.

Other Comprehensive Income (L41

Other Comprehensive Income (Loss) Other Comprehensive Income (Loss) Net of Tax (Tables)	3 Months Ended
	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Comprehensive Income (Loss) [Table Text Block]	Other comprehensive income (loss) components, net of income tax, are shown in the following table for the three-month periods ended March 31, 2018 and 2017 : (in thousands) Changes in pension plan assets and benefit obligations Change in unrealized losses on debt securities Total Beginning balance at January 1, 2018 $ (23,526 ) $ (2,928 ) $ (26,454 ) Other comprehensive loss before reclassifications — (23,410 ) (23,410 ) Cumulative effect of change in accounting principle for marketable equity securities, net of tax — (995 ) (995 ) Reclassification of disproportionate income tax effects (3,175 ) (631 ) (3,806 ) Amounts reclassified from accumulated other comprehensive loss — 2,024 2,024 Activity for the period (3,175 ) (23,012 ) (26,187 ) Ending balance at March 31, 2018 $ (26,701 ) $ (25,940 ) $ (52,641 ) Beginning balance at January 1, 2017 $ (14,740 ) $ (3,005 ) $ (17,745 ) Other comprehensive income before reclassifications — 1,022 1,022 Amounts reclassified from accumulated other comprehensive income — — — Net current period other comprehensive income — 1,022 1,022 Ending balance at March 31, 2017 $ (14,740 ) $ (1,983 ) $ (16,723 )

Investment in Qualified Affor42

Investment in Qualified Affordable Housing Investment in Qualified Affordable Housing (Tables)	3 Months Ended
	Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]
Activity in Affordable Housing Program Obligation [Table Text Block]	The table below details the balances of Park’s affordable housing tax credit investments and related unfunded commitments as of March 31, 2018 and December 31, 2017. (in thousands) March 31, 2018 December 31, 2017 Affordable housing tax credit investments $ 47,818 $ 49,669 Unfunded commitments 14,282 14,282

Repurchase Agreement Borrowin43

Repurchase Agreement Borrowings Repurchase Agreement Borrowings (Tables)	3 Months Ended
	Mar. 31, 2018
Transfers and Servicing [Abstract]
Schedule of Assets and Associated Liabilities Accounted for as Secured Borrowings [Table Text Block]	The table below shows the remaining contractual maturity of repurchase agreements by collateral pledged at March 31, 2018 and December 31, 2017 : March 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 $ 182,986 $ — $ — $ 1,104 $ 184,090 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

Revenue from Contracts with C44

Revenue from Contracts with Customers (Tables)	3 Months Ended
	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
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 Condensed Statements of Income. The following table presents the Corporation's sources of other income by revenue stream and operating segment for the three-month periods ended March 31, 2018 and March 31, 2017 . Three Months Ended Revenue by Operating Segment (in thousands) PNB GFSC SEPH All Other Total Income from fiduciary activities Personal trust and agency accounts $ 2,126 $ — $ — $ — $ 2,126 Employee benefit and retirement-related accounts 1,643 — — — 1,643 Investment management and investment advisory agency accounts 2,244 — — — 2,244 Other 382 — — — 382 Service charges on deposit accounts Non-sufficient funds (NSF) fees 1,834 — — — 1,834 Demand deposit account (DDA) charges 926 — — — 926 Other 162 — — — 162 Other service income (1) Credit card 504 7 — — 511 HELOC 99 — — — 99 Installment 64 — — — 64 Real estate 2,246 — — — 2,246 Commercial 242 — 1,010 — 1,252 Checkcard fee income 4,002 — — — 4,002 Bank owned life insurance income (2) 922 — — 87 1,009 ATM fees 524 — — — 524 OREO valuation adjustments (2) (30 ) — (177 ) — (207 ) Gain on sale of OREO, net 1,585 — 2,736 — 4,321 Net loss on sale of investment securities (2) (2,271 ) — — — (2,271 ) Unrealized gain on equity securities (2) 27 — — 3,462 3,489 Other components of net periodic benefit income (2) 1,652 19 34 — 1,705 Miscellaneous (3) 1,032 4 (16 ) (178 ) 842 Total other income $ 19,915 $ 30 $ 3,587 $ 3,371 $ 26,903 (1) Of the $4.2 million of revenue included within "Other service income", approximately $3.1 million is within the scope of ASC 606, with the remaining $1.1 million consisting primarily of certain credit card and 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 $0.8 million , all of which are within the scope of ASC 606 . Three Months Ended March 31, 2017 (4) Revenue by Operating Segment (in thousands) PNB GFSC SEPH All Other Total Income from fiduciary activities Personal trust and agency accounts $ 1,786 $ — $ — $ — $ 1,786 Employee benefit and retirement-related accounts 1,450 — — — 1,450 Investment management and investment advisory agency accounts 1,968 — — — 1,968 Other 310 — — — 310 Service charges on deposit accounts Non-sufficient funds (NSF) fees 1,985 — — — 1,985 Demand deposit account (DDA) charges 985 — — — 985 Other 169 — — — 169 Other service income Credit card 420 — — — 420 HELOC 91 — — — 91 Installment 158 — — — 158 Real estate 1,812 — — — 1,812 Commercial 323 — — — 323 Checkcard fee income 3,761 — — — 3,761 Bank owned life insurance income (2) 1,007 — — 96 1,103 ATM fees 542 — — — 542 OREO valuation adjustments (2) (73 ) — — — (73 ) Gain on sale of OREO, net 100 — — — 100 Other components of net periodic benefit income (2) 1,403 16 29 — 1,448 Miscellaneous (3) 917 — — (300 ) 617 Total other income $ 19,114 $ 16 $ 29 $ (204 ) $ 18,955 (1) Of the $2.8 million of revenue included within "Other service income", approximately $1.9 million is within the scope of ASC 606, with the remaining $0.9 million consisting primarily of certain credit card and 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 $0.6 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. A description of Park's revenue streams accounted for under ASC 606 includes the following: 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) from 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 debit 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 an executed deed. When Park finances the sale of OREO to the buyer, the Corporation assesses whether the buyer is committed to perform their 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. Three Months Ended Revenue by Operating Segment (in thousands) PNB GFSC SEPH All Other Total Income from fiduciary activities Personal trust and agency accounts $ 2,126 $ — $ — $ — $ 2,126 Employee benefit and retirement-related accounts 1,643 — — — 1,643 Investment management and investment advisory agency accounts 2,244 — — — 2,244 Other 382 — — — 382 Service charges on deposit accounts Non-sufficient funds (NSF) fees 1,834 — — — 1,834 Demand deposit account (DDA) charges 926 — — — 926 Other 162 — — — 162 Other service income (1) Credit card 504 7 — — 511 HELOC 99 — — — 99 Installment 64 — — — 64 Real estate 2,246 — — — 2,246 Commercial 242 — 1,010 — 1,252 Checkcard fee income 4,002 — — — 4,002 Bank owned life insurance income (2) 922 — — 87 1,009 ATM fees 524 — — — 524 OREO valuation adjustments (2) (30 ) — (177 ) — (207 ) Gain on sale of OREO, net 1,585 — 2,736 — 4,321 Net loss on sale of investment securities (2) (2,271 ) — — — (2,271 ) Unrealized gain on equity securities (2) 27 — — 3,462 3,489 Other components of net periodic benefit income (2) 1,652 19 34 — 1,705 Miscellaneous (3) 1,032 4 (16 ) (178 ) 842 Total other income $ 19,915 $ 30 $ 3,587 $ 3,371 $ 26,903 (1) Of the $4.2 million of revenue included within "Other service income", approximately $3.1 million is within the scope of ASC 606, with the remaining $1.1 million consisting primarily of certain credit card and 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 $0.8 million , all of which are within the scope of ASC 606 . Three Months Ended March 31, 2017 (4) Revenue by Operating Segment (in thousands) PNB GFSC SEPH All Other Total Income from fiduciary activities Personal trust and agency accounts $ 1,786 $ — $ — $ — $ 1,786 Employee benefit and retirement-related accounts 1,450 — — — 1,450 Investment management and investment advisory agency accounts 1,968 — — — 1,968 Other 310 — — — 310 Service charges on deposit accounts Non-sufficient funds (NSF) fees 1,985 — — — 1,985 Demand deposit account (DDA) charges 985 — — — 985 Other 169 — — — 169 Other service income Credit card 420 — — — 420 HELOC 91 — — — 91 Installment 158 — — — 158 Real estate 1,812 — — — 1,812 Commercial 323 — — — 323 Checkcard fee income 3,761 — — — 3,761 Bank owned life insurance income (2) 1,007 — — 96 1,103 ATM fees 542 — — — 542 OREO valuation adjustments (2) (73 ) — — — (73 ) Gain on sale of OREO, net 100 — — — 100 Other components of net periodic benefit income (2) 1,403 16 29 — 1,448 Miscellaneous (3) 917 — — (300 ) 617 Total other income $ 19,114 $ 16 $ 29 $ (204 ) $ 18,955 (1) Of the $2.8 million of revenue included within "Other service income", approximately $1.9 million is within the scope of ASC 606, with the remaining $0.9 million consisting primarily of certain credit card and 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 $0.6 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.

Recent Accounting Pronounceme45

Recent Accounting Pronouncements Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Accounting Standards Update 2016-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Additional income due to changes in accounting for equity investments	$ 3,200
Adjustments for New Accounting Pronouncement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	3,800
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets		$ 3,806
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	1,917
AOCI Including Portion Attributable to Noncontrolling Interest [Member] | Accounting Standards Update 2016-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	$ 995

Loans (Narrative) (Details)

Loans (Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable, Deferred Income	$ 12,300,000		$ 12,200,000
Troubled Debt Restructuring, Classification removed	324,000	$ 0
Partial Charge-Offs On Impaired Loans	9,972,000		10,040,000
Impaired Financing Receivable, Related Allowance	1,207,000		684,000
Recorded investment, related to loans	6,100,000		3,500,000
Troubled Debt Restructuring Included In Nonaccrual Loans	24,000,000		38,500,000
TDRs included in accruing loan totals	18,800,000		20,200,000
Nonaccrual Trouble Debt Restructuring Current	18,500,000		32,400,000
Commitments to lend additional funds to borrowers whose terms had been modified in a TDR	800,000		1,300,000
Specific reserves related to troubled debt restructuring	700,000		500,000
Additional Specific Reserves Related To Troubled Debt Restructuring	10,000	280,000
Financing Receivable, Modifications, Recorded Investment, During Period	1,835,000	8,085,000
Loan Modifications on Nonacrrual status	$ 500,000	2,600,000
Loan past due period before entering default status	30 days
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period	$ 1,377,000	1,987,000
Deposit Liabilities Reclassified as Loans Receivable	1,400,000		1,900,000
Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment [Line Items]
Partial Charge-Offs On Impaired Loans	5,800,000		7,900,000
Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment [Line Items]
Partial Charge-Offs On Impaired Loans	4,200,000		2,100,000
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	249,000	379,000
Commercial Real Estate [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Related Allowance	0		0
Commercial Real Estate [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Related Allowance	29,000		$ 2,000
Accruing [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	429,000	3,585,000
Loans modified during period	72,000	60,000
Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	1,406,000	4,500,000
Loans modified during period	1,300,000	1,900,000
Nonaccrual [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	249,000	379,000
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	6,000,000	1,400,000
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	$ 0	$ 113,000

Loans (Composition Of Loan Port

Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		$ 50,322	$ 70,127	$ 56,564
Loan balance		5,292,349		5,372,483
Accrued interest receivable		20,369		22,164
Recorded Investment		5,307,975		5,389,142
Impaired Financing Receivable, Average Recorded Investment		50,863	67,950
Impaired Financing Receivable, Interest Income, Cash Basis Method		421	811
Construction Real Estate Commercial [Domain]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		1,393	2,041
Loan balance		126,561		125,389
Accrued interest receivable		375		401
Recorded Investment		126,936		125,790
Impaired Financing Receivable, Average Recorded Investment		1,377	2,096
Impaired Financing Receivable, Interest Income, Cash Basis Method		14	15
Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		27,050	22,542
Impaired Financing Receivable, Average Recorded Investment		20,078	19,471
Impaired Financing Receivable, Interest Income, Cash Basis Method		174	220
Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance		51,379		52,203
Accrued interest receivable		119		133
Recorded Investment		51,498		52,336
Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance		3,244		3,878
Accrued interest receivable		11		13
Recorded Investment		3,255		3,891
Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		2,896	22,803
Loan balance		389,766		393,094
Accrued interest receivable		1,043		1,029
Recorded Investment		390,809		394,123
Impaired Financing Receivable, Average Recorded Investment		11,215	23,081
Impaired Financing Receivable, Interest Income, Cash Basis Method		31	345
Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance		1,097,166		1,110,426
Accrued interest receivable		1,327		1,516
Recorded Investment		1,098,493		1,111,942
Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance		194,158		203,178
Accrued interest receivable		904		974
Recorded Investment		195,062		204,152
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance		17,570		18,526
Accrued interest receivable		49		53
Recorded Investment		17,619		18,579
Loans Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Accrued interest receivable		15,626		16,659
Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance	[1]	1,000,786		1,053,453
Accrued interest receivable	[1]	4,243		4,413
Recorded Investment	[1]	1,005,029		1,057,866
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment		18,983	22,732
Loan balance	[1]	1,156,563		1,167,607
Accrued interest receivable	[1]	4,047		4,283
Recorded Investment	[1]	1,160,610		1,171,890
Impaired Financing Receivable, Average Recorded Investment		18,193	23,297
Impaired Financing Receivable, Interest Income, Cash Basis Method		202	231
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Impaired Financing Receivable, Recorded Investment			9
Loan balance		1,252,251		1,241,736
Accrued interest receivable		3,462		3,808
Recorded Investment		1,255,713		1,245,544
Impaired Financing Receivable, Average Recorded Investment			$ 5
Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan balance		2,905		2,993
Accrued interest receivable		46		36
Recorded Investment		$ 2,951		$ 3,029
[1]	Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class.

Loans (Recorded Investment In N

Loans (Recorded Investment In Nonaccrual Restructured And Loans Past Due 90 Days Or More And Accruing) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans	$ 66,151	$ 72,056
Accruing restructured loans	18,757	20,177
Loans past due 90 days or more and accruing	1,406	1,845
Total nonperforming loans	86,314	94,078
Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans	25,985	16,773
Accruing restructured loans	1,088	1,291
Loans past due 90 days or more and accruing	0
Total nonperforming loans	27,073	18,064
Construction Real Estate Commercial [Domain]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans	960	986
Accruing restructured loans	433	338
Loans past due 90 days or more and accruing	0	0
Total nonperforming loans	1,393	1,324
Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans	0	8
Accruing restructured loans	16	92
Loans past due 90 days or more and accruing	0	0
Total nonperforming loans	16	100
Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans	43	52
Accruing restructured loans	6	0
Loans past due 90 days or more and accruing	0	0
Total nonperforming loans	49	52
Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans	2,674	18,835
Accruing restructured loans	222	224
Loans past due 90 days or more and accruing	0
Total nonperforming loans	2,896	19,059
Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans	16,856	16,841
Accruing restructured loans	10,022	10,766
Loans past due 90 days or more and accruing	669	568
Total nonperforming loans	27,547	28,175
Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans	1,482	1,593
Accruing restructured loans	882	1,025
Loans past due 90 days or more and accruing	47	14
Total nonperforming loans	2,411	2,632
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans	527	586
Accruing restructured loans	695	616
Loans past due 90 days or more and accruing	0	7
Total nonperforming loans	1,222	1,209
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans	14,213	12,979
Accruing restructured loans	4,770	5,163
Loans past due 90 days or more and accruing	0
Total nonperforming loans	18,983	18,142
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Nonaccrual loans	3,411	3,403
Accruing restructured loans	623	662
Loans past due 90 days or more and accruing	690	1,256
Total nonperforming loans	$ 4,724	$ 5,321

Loans (Loans Individually And C

Loans (Loans Individually And Collectively Evaluated For Impairment) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	$ 1,207	$ 684
Nonaccrual and accruing restructured loans	84,908	92,233
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	50,322	56,564
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	34,586	35,669
Partial Charge-Offs On Impaired Loans	9,972	10,040
Commercial Financial And Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	27,073	18,064
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	27,050	18,039
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	23	25
Construction Real Estate Commercial [Domain]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	1,393	1,324
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	1,393	1,324
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	0	0
Construction Real Estate - Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	16	100
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	0	0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	16	100
Construction Real Estate - Installment [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	49	52
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	0	0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	49	52
Residential Real Estate - Commercial [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	2,896	19,059
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	2,896	19,059
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	0	0
Residential Real Estate - Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	26,878	27,607
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	0	0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	26,878	27,607
Residential Real Estate - HELOC [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	2,364	2,618
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	0	0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	2,364	2,618
Residential Real Estate - Installment [Member]
Financing Receivable, Impaired [Line Items]
Nonaccrual and accruing restructured loans	1,222	1,202
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	0	0
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	1,222	1,202
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	29	2
Nonaccrual and accruing restructured loans	18,983	18,142
Nonaccrual and accruing restructured loans, loans individually evaluated for impairment	18,983	18,142
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	0	0
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0
Nonaccrual and accruing restructured loans	4,034	4,065
Nonaccrual and accruing restructured loans, loans collectively evaluated for impairment	4,034	4,065
Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Partial Charge-Offs On Impaired Loans	$ 5,800	$ 7,900

Loans (Loans Individually Evalu

Loans (Loans Individually Evaluated For Impairment By Class Of Loans) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	$ 60,263		$ 66,585
Recorded investment	50,322	$ 70,127	56,564
Allowance for loan losses allocated	1,207		684
Impaired Financing Receivable, Average Recorded Investment	50,863	67,950
Impaired Financing Receivable, Interest Income, Cash Basis Method	421	811
Commercial Financial And Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	27,050	22,542
Impaired Financing Receivable, Average Recorded Investment	20,078	19,471
Impaired Financing Receivable, Interest Income, Cash Basis Method	174	220
Commercial Financial And Agricultural [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	27,201		19,899
Recorded investment	22,255		14,704
Allowance for loan losses allocated	0		0
Commercial Financial And Agricultural [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	7,082		5,394
Recorded investment	4,795		3,335
Allowance for loan losses allocated	1,165		681
Construction Real Estate Commercial [Domain]
Financing Receivable, Impaired [Line Items]
Recorded investment	1,393	2,041
Impaired Financing Receivable, Average Recorded Investment	1,377	2,096
Impaired Financing Receivable, Interest Income, Cash Basis Method	14	15
Construction Real Estate Commercial [Domain] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	1,264		2,788
Recorded investment	1,265		1,324
Allowance for loan losses allocated	0		0
Construction Real Estate Commercial [Domain] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	1,592
Recorded investment	128
Allowance for loan losses allocated	8
Residential Real Estate - Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	2,896	22,803
Impaired Financing Receivable, Average Recorded Investment	11,215	23,081
Impaired Financing Receivable, Interest Income, Cash Basis Method	31	345
Residential Real Estate - Commercial [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	3,107		19,346
Recorded investment	2,786		19,012
Allowance for loan losses allocated	0		0
Residential Real Estate - Commercial [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	123		47
Recorded investment	110		47
Allowance for loan losses allocated	5		1
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	18,983	22,732
Impaired Financing Receivable, Average Recorded Investment	18,193	23,297
Impaired Financing Receivable, Interest Income, Cash Basis Method	202	231
Commercial Real Estate [Member] | Financing Receivable With No Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	18,370		18,974
Recorded investment	17,901		18,060
Allowance for loan losses allocated	0		0
Commercial Real Estate [Member] | Financing Receivable With A Related Allowance Recorded [Member]
Financing Receivable, Impaired [Line Items]
Unpaid principal balance	1,524		137
Recorded investment	1,082		82
Allowance for loan losses allocated	$ 29		$ 2
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment		9
Impaired Financing Receivable, Average Recorded Investment		$ 5

Loans (Average Recorded Investm

Loans (Average Recorded Investment And Interest Income Recognized On Loans Individually Evaluated For Impairment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Recorded investment	$ 50,322	$ 70,127	$ 56,564
Average recorded investment	50,863	67,950
Interest income recognized	421	811
Commercial Financial And Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	27,050	22,542
Average recorded investment	20,078	19,471
Interest income recognized	174	220
Construction Real Estate Commercial [Domain]
Financing Receivable, Impaired [Line Items]
Recorded investment	1,393	2,041
Average recorded investment	1,377	2,096
Interest income recognized	14	15
Residential Real Estate - Commercial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	2,896	22,803
Average recorded investment	11,215	23,081
Interest income recognized	31	345
Commercial Real Estate [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment	18,983	22,732
Average recorded investment	18,193	23,297
Interest income recognized	$ 202	231
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment		9
Average recorded investment		$ 5

Loans (Aging Of Recorded Invest

Loans (Aging Of Recorded Investment In Past Due Loans) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018		Mar. 31, 2017	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		$ 20,109			$ 25,241
Past due nonaccrual loans and loans past due 90 days or more and accruing		27,626	[1]		17,776	[2]
Total loans past due		47,735			43,017
Total current		5,260,240			5,346,125
Recorded Investment		5,307,975			5,389,142
Loans past due 90 days or more and accruing		1,406			1,845
Impaired Financing Receivable, Recorded Investment, Nonaccrual loans which are current in regards to contractual P&I payments		39,900			56,100
Financing Receivable, Modifications, Recorded Investment, During Period		1,835		$ 8,085
Construction Real Estate Commercial [Domain]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days					29
Total loans past due					29
Total current		126,936			125,761
Recorded Investment		126,936			125,790
Loans past due 90 days or more and accruing		0			0
Financing Receivable, Modifications, Recorded Investment, During Period		63
Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		1,483			145
Past due nonaccrual loans and loans past due 90 days or more and accruing		13,100	[1]		1,043	[2]
Total loans past due		14,583			1,188
Total current		990,446			1,056,678
Loans past due 90 days or more and accruing		0
Financing Receivable, Modifications, Recorded Investment, During Period		55		4,098
Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		84			256
Total loans past due		84			256
Total current		51,414			52,080
Recorded Investment		51,498			52,336
Loans past due 90 days or more and accruing		0			0
Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		49			54
Past due nonaccrual loans and loans past due 90 days or more and accruing		3	[1]		19	[2]
Total loans past due		52			73
Total current		3,203			3,818
Recorded Investment		3,255			3,891
Loans past due 90 days or more and accruing		0			0
Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		413			16
Past due nonaccrual loans and loans past due 90 days or more and accruing		1,023	[1]		1,586	[2]
Total loans past due		1,436			1,602
Total current		389,373			392,521
Recorded Investment		390,809			394,123
Loans past due 90 days or more and accruing		0
Financing Receivable, Modifications, Recorded Investment, During Period				2,140
Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		9,465			11,515
Past due nonaccrual loans and loans past due 90 days or more and accruing		8,010	[1]		9,232	[2]
Total loans past due		17,475			20,747
Total current		1,081,018			1,091,195
Recorded Investment		1,098,493			1,111,942
Loans past due 90 days or more and accruing		669			568
Financing Receivable, Modifications, Recorded Investment, During Period		650		608
Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		570			616
Past due nonaccrual loans and loans past due 90 days or more and accruing		729	[1]		876	[2]
Total loans past due		1,299			1,492
Total current		193,763			202,660
Recorded Investment		195,062			204,152
Loans past due 90 days or more and accruing		47			14
Financing Receivable, Modifications, Recorded Investment, During Period		339		206
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		268			239
Past due nonaccrual loans and loans past due 90 days or more and accruing		215	[1]		253	[2]
Total loans past due		483			492
Total current		17,136			18,087
Recorded Investment		17,619			18,579
Loans past due 90 days or more and accruing		0			7
Financing Receivable, Modifications, Recorded Investment, During Period		115		34
Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Recorded Investment	[3]	1,005,029			1,057,866
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		210			856
Past due nonaccrual loans and loans past due 90 days or more and accruing		2,748	[1]		2,360	[2]
Total loans past due		2,958			3,216
Total current		1,157,652			1,168,674
Recorded Investment	[3]	1,160,610			1,171,890
Loans past due 90 days or more and accruing		0
Financing Receivable, Modifications, Recorded Investment, During Period		249		379
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		7,567			11,515
Past due nonaccrual loans and loans past due 90 days or more and accruing		1,798	[1]		2,407	[2]
Total loans past due		9,365			13,922
Total current		1,246,348			1,231,622
Recorded Investment		1,255,713			1,245,544
Loans past due 90 days or more and accruing		690			1,256
Financing Receivable, Modifications, Recorded Investment, During Period		364		620
Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing loans past due 30-89 days		0			0
Past due nonaccrual loans and loans past due 90 days or more and accruing		0	[1]		0	[2]
Total loans past due		0			0
Total current		2,951			3,029
Recorded Investment		2,951			$ 3,029
Accruing Financing Receivable Modifications [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		429		3,585
Accruing Financing Receivable Modifications [Member] | Construction Real Estate Commercial [Domain]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		63
Accruing Financing Receivable Modifications [Member] | Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period				3,079
Accruing Financing Receivable Modifications [Member] | Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		0		0
Accruing Financing Receivable Modifications [Member] | Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		0		0
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		0		0
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		251		200
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		102		34
Accruing Financing Receivable Modifications [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		13		272
Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		1,406		4,500
Nonaccruing Financing Receivable Modifications [Member] | Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		55		1,019
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period				2,140
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		650		608
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		88		6
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		13
Nonaccruing Financing Receivable Modifications [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		249		379
Nonaccruing Financing Receivable Modifications [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		$ 351		$ 348
[1]	1) Includes $1.4 million of loans past due 90 days or more and accruing. The remaining loans were past due nonaccrual loans.(2) Includes $39.9 million of nonaccrual loans which were current in regards to contractual principal and interest payments
[2]	1) Includes $1.8 million of loans past due 90 days or more and accruing. The remaining loans were past due nonaccrual loans.(2) Includes $56.1 million of nonaccrual loans which were current in regards to contractual principal and interest payments.
[3]	Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class.

Loans (Recorded Investment By L

Loans (Recorded Investment By Loan Grade) (Details) - USD ($) $ in Thousands		Mar. 31, 2018		Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment		$ 5,292,349		$ 5,372,483
Construction Real Estate Commercial [Domain]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment		126,561		125,389
Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment		389,766		393,094
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	[1]	1,156,563		1,167,607
Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment		2,905		2,993
5 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		3,063		23,088
5 Rated [Member] | Construction Real Estate Commercial [Domain]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment				278
5 Rated [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		412		216
5 Rated [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		475	[2]	17,272	[3]
5 Rated [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		2,176	[2]	5,322	[3]
5 Rated [Member] | Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		0		0
6 Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		474		611
6 Rated [Member] | Construction Real Estate Commercial [Domain]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		344		0
6 Rated [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment				1
6 Rated [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		130	[2]	153	[3]
6 Rated [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment	[3]			457
6 Rated [Member] | Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		0		0
Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		50,345		56,589
Impaired [Member] | Construction Real Estate Commercial [Domain]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		1,393		1,324
Impaired [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		2,896		19,059
Impaired [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		27,073	[2]	18,064	[3]
Impaired [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		18,983	[2]	18,142	[3]
Impaired [Member] | Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		0		0
Pass Rated [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		2,632,453		2,672,410
Pass Rated [Member] | Construction Real Estate Commercial [Domain]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		125,199		124,188
Pass Rated [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		387,501		374,847
Pass Rated [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		977,351	[2]	1,022,377	[3]
Pass Rated [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		1,139,451	[2]	1,147,969	[3]
Pass Rated [Member] | Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Total ending loan balance, recorded investment		2,951		3,029
Recorded Investment [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment		2,686,335		2,752,698
Recorded Investment [Member] | Construction Real Estate Commercial [Domain]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment		126,936		125,790
Recorded Investment [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment		390,809		394,123
Recorded Investment [Member] | Commercial, Financial, and Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment		1,005,029	[2]	1,057,866	[3]
Recorded Investment [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment		1,160,610	[2]	1,171,890	[3]
Recorded Investment [Member] | Leases [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment		$ 2,951		$ 3,029
[1]	Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class.
[2]	* Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class.
[3]	* Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class.

Loans (TDR Number Of Contracts

Loans (TDR Number Of Contracts Modified And Recorded Investment) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)contracts	Mar. 31, 2017USD ($)contracts
Financing Receivable, Recorded Investment [Line Items]
Additional Specific Reserves Related To Troubled Debt Restructuring	$ 10	$ 280
Troubled Debt Restructuring, Classification removed	$ 324	$ 0
Number of Contracts | contracts	74	83
Total Recorded Investment	$ 1,835	$ 8,085
Financing Receivable, Modifications, Subsequent Default, Recorded Investment, During Period	$ 1,377	$ 1,987
Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	0
Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	4	6
Total Recorded Investment	$ 55	$ 4,098
Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	3
Total Recorded Investment		$ 2,140
Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	9	9
Total Recorded Investment	$ 650	$ 608
Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	0
Residential Real Estate Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment	$ 115	$ 34
Residential Real Estate Home Equity Line Of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	2	3
Total Recorded Investment	$ 339	$ 206
Construction Real Estate Commercial [Domain]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	1	0
Total Recorded Investment	$ 63
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	3	4
Total Recorded Investment	$ 249	$ 379
Residential Real Estate Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	5	1
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	50	57
Total Recorded Investment	$ 364	$ 620
Accruing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment	429	3,585
Accruing [Member] | Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment	0	0
Accruing [Member] | Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment		3,079
Accruing [Member] | Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment	0	0
Accruing [Member] | Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment	0	0
Accruing [Member] | Residential Real Estate Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment	102	34
Accruing [Member] | Residential Real Estate Home Equity Line Of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment	251	200
Accruing [Member] | Construction Real Estate Commercial [Domain]
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment	63
Accruing [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment	13	272
Nonaccrual [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment	1,406	4,500
Nonaccrual [Member] | Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment	55	1,019
Nonaccrual [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment		2,140
Nonaccrual [Member] | Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment	650	608
Nonaccrual [Member] | Residential Real Estate Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment	13
Nonaccrual [Member] | Residential Real Estate Home Equity Line Of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment	88	6
Nonaccrual [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment	249	379
Nonaccrual [Member] | Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Recorded Investment	$ 351	$ 348

Loans (Recorded Investment In F

Loans (Recorded Investment In Financing Receivable Modified As TDR Within 12 Months) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)contracts	Mar. 31, 2017USD ($)contracts	Dec. 31, 2017USD ($)
Financing Receivable, Recorded Investment [Line Items]
Troubled Debt Restructuring, Classification removed	$ 324	$ 0
Number of Contracts | contracts	56	52
Recorded Investment	$ 1,377	$ 1,987
Financing Receivable, Modifications, Recorded Investment, During Period	1,835	$ 8,085
Troubled Debt Restructuring Included In Nonaccrual Loans	24,000		$ 38,500
Nonaccrual Trouble Debt Restructuring Current	$ 18,500		$ 32,400
Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	3	6
Recorded Investment	$ 207	$ 198
Financing Receivable, Modifications, Recorded Investment, During Period	$ 55	$ 4,098
Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	1	3
Recorded Investment	$ 17	$ 49
Financing Receivable, Modifications, Recorded Investment, During Period		$ 2,140
Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	7	8
Recorded Investment	$ 536	$ 631
Financing Receivable, Modifications, Recorded Investment, During Period	$ 650	$ 608
Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	3	0
Recorded Investment	$ 174
Financing Receivable, Modifications, Recorded Investment, During Period	339	$ 206
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	$ 115	$ 34
Construction Real Estate Commercial [Domain]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	0
Financing Receivable, Modifications, Recorded Investment, During Period	$ 63
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	$ 364	$ 620
Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	1	5
Recorded Investment	$ 114	$ 838
Financing Receivable, Modifications, Recorded Investment, During Period	$ 249	$ 379
Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	0
Recorded Investment	$ 0	$ 0
Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	0
Recorded Investment	$ 0	$ 0
Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	1
Recorded Investment	$ 0	$ 3
Consumer Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	41	29
Recorded Investment	$ 329	$ 268
Finance Leases Financing Receivable [Member]
Financing Receivable, Recorded Investment [Line Items]
Number of Contracts | contracts	0	0
Recorded Investment	$ 0	$ 0
Accruing Financing Receivable Modifications [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	429	3,585
Accruing Financing Receivable Modifications [Member] | Construction Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	0	0
Accruing Financing Receivable Modifications [Member] | Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		3,079
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	0	0
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	251	200
Accruing Financing Receivable Modifications [Member] | Construction Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	0	0
Accruing Financing Receivable Modifications [Member] | Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	102	34
Accruing Financing Receivable Modifications [Member] | Construction Real Estate Commercial [Domain]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	63
Accruing Financing Receivable Modifications [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	13	272
Nonaccruing Financing Receivable Modifications [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	1,406	4,500
Nonaccruing Financing Receivable Modifications [Member] | Commercial Financial And Agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	55	1,019
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period		2,140
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	650	608
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - HELOC [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	88	6
Nonaccruing Financing Receivable Modifications [Member] | Residential Real Estate - Installment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	13
Nonaccruing Financing Receivable Modifications [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	351	348
Nonaccruing Financing Receivable Modifications [Member] | Commercial Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing Receivable, Modifications, Recorded Investment, During Period	$ 249	$ 379

Allowance For Loan Losses (Acti

Allowance For Loan Losses (Activity In The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	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			96 months	84 months
Financing Receivable, Allowance for Credit Losses, Write-downs	$ 3,450	$ 3,708
Financing Receivable, Allowance for Credit Losses, Recovery	2,171	2,130
Financing Receivables Allowance For Credit Losses Net Charge Offs	1,279	1,578
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	49,988	50,624	$ 50,624
Ending balance	48,969	49,922	49,988	$ 50,624
Provision for Loan, Lease, and Other Losses	260	876
Commercial Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	649	339
Financing Receivable, Allowance for Credit Losses, Recovery	652	369
Financing Receivables Allowance For Credit Losses Net Charge Offs	(3)	(30)
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	15,022	13,434	13,434
Ending balance	14,077	13,437	15,022	13,434
Provision for Loan, Lease, and Other Losses	(948)	(27)
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	47	112
Financing Receivable, Allowance for Credit Losses, Recovery	87	114
Financing Receivables Allowance For Credit Losses Net Charge Offs	(40)	(2)
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	9,601	10,432	10,432
Ending balance	9,488	10,281	9,601	10,432
Provision for Loan, Lease, and Other Losses	(153)	(153)
Construction Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	0	27
Financing Receivable, Allowance for Credit Losses, Recovery	59	58
Financing Receivables Allowance For Credit Losses Net Charge Offs	(59)	(31)
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,430	5,247	5,247
Ending balance	4,463	4,368	4,430	5,247
Provision for Loan, Lease, and Other Losses	(26)	(910)
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	116	480
Financing Receivable, Allowance for Credit Losses, Recovery	360	291
Financing Receivables Allowance For Credit Losses Net Charge Offs	(244)	189
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	9,321	10,958	10,958
Ending balance	9,415	10,745	9,321	10,958
Provision for Loan, Lease, and Other Losses	(150)	(24)
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	2,638	2,750
Financing Receivable, Allowance for Credit Losses, Recovery	1,013	1,298
Financing Receivables Allowance For Credit Losses Net Charge Offs	1,625	1,452
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	11,614	10,553	10,553
Ending balance	11,526	11,091	11,614	10,553
Provision for Loan, Lease, and Other Losses	1,537	1,990
Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	0	0
Financing Receivable, Allowance for Credit Losses, Recovery	0	0
Financing Receivables Allowance For Credit Losses Net Charge Offs	0	0
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	0	0
Ending balance	0	0	$ 0	$ 0
Provision for Loan, Lease, and Other Losses	$ 0	$ 0

Allowance For Loan Losses (Comp

Allowance For Loan Losses (Composition Of The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment		$ 1,207	$ 684
Allowance for loan losses collectively evaluated for impairment		47,762	49,304
Total ending allowance balance		48,969	49,988
Loans individually evaluated for impairment		50,292	56,545
Loans collectively evaluated for impairment		5,242,057	5,315,938
Total ending loan balance, net of accrued interest receivable		$ 5,292,349	$ 5,372,483
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment		2.39998%	1.20966%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment		0.91113%	0.92748%
Total ending allowance for loan losses balance as a percentage of loan balance		0.92528%	0.93045%
Recorded investment		$ 50,322	$ 56,564
Recorded investment collectively evaluated for impairment		5,257,653	5,332,578
Recorded Investment		5,307,975	5,389,142
Commercial Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment		1,165	681
Allowance for loan losses collectively evaluated for impairment		12,912	14,341
Total ending allowance balance		14,077	15,022
Loans individually evaluated for impairment		27,045	18,034
Loans collectively evaluated for impairment		973,741	1,035,419
Total ending loan balance, net of accrued interest receivable	[1]	$ 1,000,786	$ 1,053,453
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment		4.30764%	3.7762%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment		1.32602%	1.38504%
Total ending allowance for loan losses balance as a percentage of loan balance		1.40659%	1.42598%
Recorded investment		$ 27,050	$ 18,039
Recorded investment collectively evaluated for impairment		977,979	1,039,827
Recorded Investment	[1]	1,005,029	1,057,866
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment		29	2
Allowance for loan losses collectively evaluated for impairment		9,459	9,599
Total ending allowance balance		9,488	9,601
Loans individually evaluated for impairment		18,960	18,131
Loans collectively evaluated for impairment		1,137,603	1,149,476
Total ending loan balance, net of accrued interest receivable	[1]	$ 1,156,563	$ 1,167,607
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment		0.15295%	0.01103%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment		0.83149%	0.83508%
Total ending allowance for loan losses balance as a percentage of loan balance		0.82036%	0.82228%
Recorded investment		$ 18,983	$ 18,142
Recorded investment collectively evaluated for impairment		1,141,627	1,153,748
Recorded Investment	[1]	1,160,610	1,171,890
Construction Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment		8	0
Allowance for loan losses collectively evaluated for impairment		4,455	4,430
Total ending allowance balance		4,463	4,430
Loans individually evaluated for impairment		1,391	1,322
Loans collectively evaluated for impairment		179,793	180,148
Total ending loan balance, net of accrued interest receivable		$ 181,184	$ 181,470
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment		0.57513%	0.00%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment		2.47785%	2.45909%
Total ending allowance for loan losses balance as a percentage of loan balance		2.46324%	2.44117%
Recorded investment		$ 1,393	$ 1,324
Recorded investment collectively evaluated for impairment		180,296	180,693
Recorded Investment		181,689	182,017
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment		5	1
Allowance for loan losses collectively evaluated for impairment		9,410	9,320
Total ending allowance balance		9,415	9,321
Loans individually evaluated for impairment		2,896	19,058
Loans collectively evaluated for impairment		1,695,764	1,706,166
Total ending loan balance, net of accrued interest receivable		$ 1,698,660	$ 1,725,224
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment		0.17265%	0.00525%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment		0.55491%	0.54625%
Total ending allowance for loan losses balance as a percentage of loan balance		0.55426%	0.54028%
Recorded investment		$ 2,896	$ 19,059
Recorded investment collectively evaluated for impairment		1,699,087	1,709,737
Recorded Investment		1,701,983	1,728,796
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment		0	0
Allowance for loan losses collectively evaluated for impairment		11,526	11,614
Total ending allowance balance		11,526	11,614
Loans individually evaluated for impairment		0	0
Loans collectively evaluated for impairment		1,252,251	1,241,736
Total ending loan balance, net of accrued interest receivable		$ 1,252,251	$ 1,241,736
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment		0.00%	0.00%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment		0.92042%	0.9353%
Total ending allowance for loan losses balance as a percentage of loan balance		0.92042%	0.9353%
Recorded investment		$ 0	$ 0
Recorded investment collectively evaluated for impairment		1,255,713	1,245,544
Recorded Investment		1,255,713	1,245,544
Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses individually evaluated for impairment		0	0
Allowance for loan losses collectively evaluated for impairment		0	0
Total ending allowance balance		0	0
Loans individually evaluated for impairment		0	0
Loans collectively evaluated for impairment		2,905	2,993
Total ending loan balance, net of accrued interest receivable		$ 2,905	$ 2,993
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment		0.00%	0.00%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment		0.00%	0.00%
Total ending allowance for loan losses balance as a percentage of loan balance		0.00%	0.00%
Recorded investment		$ 0	$ 0
Recorded investment collectively evaluated for impairment		2,951	3,029
Recorded Investment		$ 2,951	$ 3,029
[1]	Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class.

Other Real Estate Owned Other58

Other Real Estate Owned Other Real Estate Owned (Details) - USD ($) $ in Thousands	Mar. 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	$ 9,055	$ 14,190
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	2,890	7,888
Construction 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	4,692	4,852
Residential 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	1,473	1,450
Mortgage Loans in Process of Foreclosure, Amount	$ 2,219	$ 2,948

Earnings Per Common Share (Narr

Earnings Per Common Share (Narrative) (Details) - shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Treasury Stock, Shares, Acquired	0	50,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	139,144		116,716
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	142,996	120,710
Common Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period	48,000	46,000
Treasury Stock, Shares, Acquired	0	50,000

Earnings Per Common Share (Summ

Earnings Per Common Share (Summary Of Computation Of Basic And Diluted Earnings Per Common Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Income available to common shareholders	$ 31,123	$ 20,267
Denominator for basic earnings per share (weighted average common shares outstanding)	15,288,332	15,312,059
Effect of dilutive options and warrants	142,996	120,710
Denominator for diluted earnings per share (weighted average common shares outstanding adjusted for the effect of dilutive options and warrants)	15,431,328	15,432,769
Basic earnings per common share	$ 2.04	$ 1.32
Diluted earnings per common share	$ 2.02	$ 1.31

Segment Information (Schedule O

Segment Information (Schedule Of Operating Results By Segment) (Details)	3 Months Ended
	Mar. 31, 2018USD ($)segments	Mar. 31, 2017USD ($)	Dec. 31, 2017USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segments	3
Net interest income	$ 64,850,000	$ 58,952,000
Provision for (recovery of) loan losses	260,000	876,000
Other income and security gains	26,903,000	18,955,000
Total other expense	54,308,000	48,910,000
Income (loss) before income taxes	37,185,000	28,121,000
Income Tax Expense (Benefit)	6,062,000	7,854,000
Net Income	31,123,000	20,267,000
Assets	7,518,970,000	7,744,690,000	$ 7,537,620,000
PNB [Member]
Segment Reporting Information [Line Items]
Net interest income	61,441,000	57,480,000
Provision for (recovery of) loan losses	(67,000)	720,000
Other income and security gains	19,915,000	19,114,000
Total other expense	49,001,000	45,206,000
Income (loss) before income taxes	32,422,000	30,668,000
Income Tax Expense (Benefit)	5,677,000	9,182,000
Net Income	26,745,000	21,486,000
Assets	7,455,518,000	7,667,288,000
GFSC [Member]
Segment Reporting Information [Line Items]
Net interest income	1,305,000	1,478,000
Provision for (recovery of) loan losses	503,000	437,000
Other income and security gains	30,000	16,000
Total other expense	760,000	752,000
Income (loss) before income taxes	72,000	305,000
Income Tax Expense (Benefit)	15,000	107,000
Net Income	57,000	198,000
Assets	30,553,000	34,574,000
SEPH [Member]
Segment Reporting Information [Line Items]
Net interest income	1,877,000	201,000
Provision for (recovery of) loan losses	(176,000)	(281,000)
Other income and security gains	3,587,000	29,000
Total other expense	2,025,000	805,000
Income (loss) before income taxes	3,615,000	(294,000)
Income Tax Expense (Benefit)	759,000	(103,000)
Net Income	2,856,000	(191,000)
Assets	27,726,000	24,727,000
All Other [Member]
Segment Reporting Information [Line Items]
Net interest income	227,000	(207,000)
Other income and security gains	3,371,000	(204,000)
Total other expense	2,522,000	2,147,000
Income (loss) before income taxes	1,076,000	(2,558,000)
Income Tax Expense (Benefit)	(389,000)	(1,332,000)
Net Income	1,465,000	(1,226,000)
Assets	$ 5,173,000	$ 18,101,000

Mortgage Loans Held For Sale (D

Mortgage Loans Held For Sale (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Mortgage Loans Held for Sale [Line Items]
Mortgages Held-for-sale, Fair Value Disclosure	$ 6,703	$ 4,148
Disposal Group, Including Discontinued Operation, Mortgage Loans	6,600	4,100
Gain (Loss) on Sale of Mortgage Loans	$ 92	$ 55

Investment Securities (Narrativ

Investment Securities (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule of Investments [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Tax Equivalent Interest Adjustment	$ 578,000
Investment Securities average remaining life	4 years 11 months 5 days
Available-for-sale Securities, Gross Realized Losses	$ 2,600,000
Debt securities held-to-maturity, at amortized cost (fair value of $346,199 and $363,779 at March 31, 2018 and December 31, 2017, respectively)	347,622,000		$ 357,197,000
Held-to-maturity Securities, Sold Security, Realized Gain (Loss)	$ 291,000
percent of held to securities sold paid down	96.30%
Other than Temporary Impairment Losses, Investments	$ 0	$ 0
Available-for-sale Securities, Gross Realized Gains	$ 0
Asset backed securities mortgage portfolio, term	15 years
Available-for-sale securities	$ 1,079,745,000		1,097,645,000
Available-for-sale Securities Pledged as Collateral	563,000,000		557,000,000
Securities sold at a gain [Member]
Schedule of Investments [Line Items]
Available-for-sale securities	246,961,000
Securities sold at a gain [Member]
Schedule of Investments [Line Items]
Debt securities held-to-maturity, at amortized cost (fair value of $346,199 and $363,779 at March 31, 2018 and December 31, 2017, respectively)	7,366,000
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Debt securities held-to-maturity, at amortized cost (fair value of $346,199 and $363,779 at March 31, 2018 and December 31, 2017, respectively)	47,767,000		56,785,000
Available-for-sale securities	$ 1,079,745,000		$ 852,645,000

Investment Securities (Schedule

Investment Securities (Schedule Of Investment Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Securities available-for-sale, amortized cost	$ 1,079,745	$ 1,097,645
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	880	4,645
Securities Available-for-Sale, Gross Unrealized Holding Losses	33,715	10,409
Securities Available-for-Sale, Total Fair value	1,046,910	1,091,881
Securities Held-to-Maturity, Amortized Cost	347,622	357,197
Securities Held-to-Maturity, Gross Unrecognized Holding Gains	3,109	7,333
Securities Held-to-Maturity, Gross Unrecognized Holding Losses	4,532	751
Securities Held-to-Maturity, Estimated Fair Value	346,199	363,779
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member]
Schedule of Investments [Line Items]
Securities available-for-sale, amortized cost		245,000
Securities Available-for-Sale, Gross Unrealized Holding Losses		2,280
Securities Available-for-Sale, Total Fair value		242,720
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Securities available-for-sale, amortized cost	1,079,745	852,645
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	880	4,645
Securities Available-for-Sale, Gross Unrealized Holding Losses	33,715	8,129
Securities Available-for-Sale, Total Fair value	1,046,910	849,161
Securities Held-to-Maturity, Amortized Cost	47,767	56,785
Securities Held-to-Maturity, Gross Unrecognized Holding Gains	18	758
Securities Held-to-Maturity, Gross Unrecognized Holding Losses	1,246	38
Securities Held-to-Maturity, Estimated Fair Value	46,539	57,505
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Securities Held-to-Maturity, Amortized Cost	299,855	300,412
Securities Held-to-Maturity, Gross Unrecognized Holding Gains	3,091	6,575
Securities Held-to-Maturity, Gross Unrecognized Holding Losses	3,286	713
Securities Held-to-Maturity, Estimated Fair Value	$ 299,660	$ 306,274

Investment Securities (Schedu65

Investment Securities (Schedule Of Unrealized Loss On Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	$ 662,276	$ 261,855
Securities Available-for-Sale, Less than 12 months, Unrealized losses	17,518	2,856
Securities Available-for-Sale, 12 months or longer, Fair value	294,713	536,586
Securities Available-for-Sale, 12 months or longer, Unrealized losses	16,197	7,553
Securities Available-for-Sale, Fair value, Total	956,989	798,441
Securities Available-for-Sale, Unrealized losses, Total	33,715	10,409
Securities Held-to-Maturity, Less than 12 months, Fair value	160,664	33,975
Securities Held-to-Maturity, Less than 12 months, Unrealized losses	2,780	232
Securities Held-to-Maturity, 12 months or longer, Fair value	49,748	45,498
Securities Held-to-Maturity, 12 months or longer, Unrealized losses	1,752	519
Securities Held-to-Maturity, Fair value, Total	210,412	79,473
Securities Held-to-Maturity, Unrealized losses, Total	4,532	751
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value		24,931
Securities Available-for-Sale, Less than 12 months, Unrealized losses		70
Securities Available-for-Sale, 12 months or longer, Fair value		217,789
Securities Available-for-Sale, 12 months or longer, Unrealized losses		2,210
Securities Available-for-Sale, Fair value, Total		242,720
Securities Available-for-Sale, Unrealized losses, Total		2,280
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Less than 12 months, Fair value	662,276	236,924
Securities Available-for-Sale, Less than 12 months, Unrealized losses	17,518	2,786
Securities Available-for-Sale, 12 months or longer, Fair value	294,713	318,797
Securities Available-for-Sale, 12 months or longer, Unrealized losses	16,197	5,343
Securities Available-for-Sale, Fair value, Total	956,989	555,721
Securities Available-for-Sale, Unrealized losses, Total	33,715	8,129
Securities Held-to-Maturity, Less than 12 months, Fair value	45,521	7,331
Securities Held-to-Maturity, Less than 12 months, Unrealized losses	1,246	38
Securities Held-to-Maturity, 12 months or longer, Fair value	0
Securities Held-to-Maturity, 12 months or longer, Unrealized losses	0
Securities Held-to-Maturity, Fair value, Total	45,521	7,331
Securities Held-to-Maturity, Unrealized losses, Total	1,246	38
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Securities Held-to-Maturity, Less than 12 months, Fair value	115,143	26,644
Securities Held-to-Maturity, Less than 12 months, Unrealized losses	1,534	194
Securities Held-to-Maturity, 12 months or longer, Fair value	49,748	45,498
Securities Held-to-Maturity, 12 months or longer, Unrealized losses	1,752	519
Securities Held-to-Maturity, Fair value, Total	164,891	72,142
Securities Held-to-Maturity, Unrealized losses, Total	$ 3,286	$ 713

Investment Securities (Amortize

Investment Securities (Amortized Cost And Estimated Fair Value Of Investments In Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Securities Available-for-Sale, Total Fair value	$ 1,046,910	$ 1,091,881
Securities Held-to-Maturity, Amortized Cost	347,622	357,197
Securities held-to-maturity, fair value	346,199	363,779
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	2,446
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	$ 2,420
Held to Maturity Securities weighted avg yield five through ten	2.97%
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	$ 297,409
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	$ 297,240
Held to Maturity Securities Debt Maturities Years Over Ten weighted avg yield	3.68%
Securities Held-to-Maturity, Amortized Cost	$ 299,855	300,412
Securities held-to-maturity, fair value	$ 299,660	306,274
Held to Maturity Securities weighted avg yield	3.67%
Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Total Fair value		242,720
U.S. Government Sponsored Entities Asset-Backed Securities [Member]
Schedule of Investments [Line Items]
Securities Available-for-Sale, Total, Amortized cost	$ 1,079,745
Securities Available-for-Sale, Total Fair value	$ 1,046,910	849,161
Available for Sale Securities Weighted Avg Yield	2.28%
Securities Held-to-Maturity, Amortized Cost	$ 47,767	56,785
Securities held-to-maturity, fair value	$ 46,539	$ 57,505
Held to Maturity Securities weighted avg yield	2.83%

Other Investment Securities (Sc

Other Investment Securities (Schedule Of Other Investment Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Investments [Line Items]
Federal Home Loan Bank Stock	$ 50,086	$ 50,086
Federal Reserve Bank Stock	8,225	8,225
Equity investments carried at fair value	8,924	1,935
Equity Method Investments	2,589	3,500
Other investment securities	$ 69,824	$ 63,746

Share Based Compensation Shar68

Share Based Compensation Share Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 8,873
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	139,144		116,716
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(18,800)	(9,674)
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
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period	(4,167)
Allocated Share-based Compensation Expense	$ 1,121	$ 826
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Period Increase (Decrease)	(2,320)
Expense to be paid next twelve months [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 2,724
Expense to be paid Year Two [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	3,098
Expense to be paid Year Three [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	2,072
Expense to be paid Year Four [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	846
Expense to be paid Year Five [Domain]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 133
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, Number of Shares Authorized	750,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	703,410
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	47,715
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	47,715
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	138,850
2013 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, Number of Shares Authorized	600,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Period Increase (Decrease)	92,554
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		45,788

Benefit Plan (Components Of Net

Benefit Plan (Components Of Net Periodic Benefit Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Other components of net periodic benefit income	$ 1,705	$ 1,448
Total other income	26,903	18,955
Employee Benefits and Share-based Compensation	7,029	6,468
Other expense	1,910	1,656
Total other expense	54,308	48,910
Service cost	1,637	1,317
Interest cost	1,309	1,271
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(68)	(131)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1,637	1,317
Interest cost	1,309	1,271
Expected return on plan assets	(3,354)	(2,863)
Amortization of prior service cost	0	0
Recognized net actuarial loss	340	144
Benefit expense	(68)	(131)
Pension plan contributions	0	0
Supplemental Employee Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	185	233
Interest cost	161	117
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	346	350
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	185	233
Interest cost	161	117
Benefit expense	$ 346	350
Restatement Adjustment [Member] | AccountingStandardsUpdate201707 [Member]
Defined Benefit Plan Disclosure [Line Items]
Other components of net periodic benefit income		1,448
Total other income		18,955
Employee Benefits and Share-based Compensation		6,468
Other expense		1,656
Total other expense		48,910
Scenario, Previously Reported [Member] | AccountingStandardsUpdate201707 [Member]
Defined Benefit Plan Disclosure [Line Items]
Other components of net periodic benefit income		0
Total other income		17,507
Employee Benefits and Share-based Compensation		5,181
Other expense		1,495
Total other expense		$ 47,462

New accounting pronouncement be

New accounting pronouncement benefit plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other components of net periodic benefit income	$ 1,705	$ 1,448
Total other income	26,903	18,955
Employee Benefits and Share-based Compensation	7,029	6,468
Other Cost and Expense, Operating	1,910	1,656
Total other expense	$ 54,308	48,910
AccountingStandardsUpdate201707 [Member] | Scenario, Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other components of net periodic benefit income		0
Total other income		17,507
Employee Benefits and Share-based Compensation		5,181
Other Cost and Expense, Operating		1,495
Total other expense		47,462
AccountingStandardsUpdate201707 [Member] | Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other components of net periodic benefit income		1,448
Total other income		18,955
Employee Benefits and Share-based Compensation		6,468
Other Cost and Expense, Operating		1,656
Total other expense		$ 48,910

Loan Servicing (Narrative) (Det

Loan Servicing (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Transfers and Servicing of Financial Assets [Abstract]
Serviced sold mortgage loans	$ 1,370,000	$ 1,330,000	$ 1,370
Serviced sold mortgage loans with recourse	2,800	3,600	$ 3,000
Servicing fees included in other service income	900	$ 900
Mortgage Loans Sold with Recourse, Reserve	$ 43

Loan Servicing (Activity For MS

Loan Servicing (Activity For MSRs And Related Valuation Allowance) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Servicing Asset at Amortized Value, Balance [Roll Forward]
Carrying amount, net, beginning of period	$ 9,688,000	$ 9,266,000
Additions	328,000	354,000
Amortization	(352,000)	(358,000)
Changes in valuation inputs & assumptions	305,000	59,000
Carrying amount, net, end of period	9,969,000	9,321,000
Valuation Allowance for Impairment of Recognized Servicing Assets [Roll Forward]
Valuation allowance, beginning of period	630,000	735,000
Changes in valuation allowance	305,000	59,000
Valuation allowance, end of period	$ 325,000	$ 676,000

Fair Value (Narrative) (Details

Fair Value (Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments Net Asset Value	$ 8,600,000		$ 8,800,000
Loans Held-for-sale, Fair Value Disclosure	6,703,000		4,148,000
Impaired Financing Receivable, Carrying Value	$ 49,115,000		55,880,000
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	$ 9,972,000		10,040,000
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	1,207,000		684,000
Impaired Financing Receivable, Related Allowance	1,207,000		684,000
Impaired Loan Fair Value	3,867,000		3,574,000
Partial Charge-Offs On Impaired Loans carried at Fair Value	2,734,000		2,780,000
Book Value Of Impaired Loans Carried At Fair Value	3,908,000		3,577,000
Impaired Financing Receivable, carried at fair value, related expense	100,000	$ 300,000
MSR recorded at lower of cost or fair value	9,969,000	9,321,000	9,688,000	$ 9,266,000
Mortgage Servicing Rights Fair Value	1,500,000		7,300,000
Valuation allowance of MSR	325,000	676,000	630,000	$ 735,000
MSRs recorded at cost	8,500,000		2,400,000
Changes due to fair value adjustments	305,000	59,000
Other Real Estate, Foreclosed Assets, and Repossessed Assets	$ 9,055,000		$ 14,190,000
Percent of OREO held at fair value	67.92932%		45.94785%
Other Real Estate, Foreclosed Assets, and Repossessed Assets, Fair Value	$ 6,200,000		$ 6,520,000
OREO valuation adjustments	207,000	$ 73,000
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments	7,200,000
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired Financing Receivable, Related Allowance	41,000		3,000
Financing Receivable, not collateral dependent [Domain]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired Financing Receivable, Related Allowance	1,166,000		681,000
Commercial Real Estate Portfolio Segment [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	29,000		2,000
Residential Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other Real Estate, Foreclosed Assets, and Repossessed Assets	$ 1,473,000		1,450,000
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired Loan Fair Value			2,735,000
Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Impaired Loan Fair Value			$ 712,000
Sales Comparison Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments	65.70%		90.00%
Sales Comparison Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments	68.40%		68.40%
Sales Comparison Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments	40.00%		33.00%
Sales Comparison Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments	79.70%		79.70%
Sales Comparison Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments	23.30%		22.70%
Sales Comparison Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments	34.70%		34.70%
Sales Comparison Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments	15.80%		12.50%
Sales Comparison Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments	36.40%		31.80%
Sales Comparison Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments	0.00%		0.00%
Sales Comparison Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments	0.90%		0.90%
Sales Comparison Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments	0.30%		0.30%
Sales Comparison Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Comparability Adjustments	1.20%		1.20%
Income Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Cap Rate	11.00%		11.00%
Income Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Cap Rate	13.00%		13.00%
Income Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Cap Rate	10.50%		10.50%
Income Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Cap Rate	9.90%		9.90%
Income Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Cap Rate	13.00%		13.00%
Income Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Cap Rate	10.50%		10.50%
Income Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Cap Rate	9.00%		9.00%
Income Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Cap Rate	13.00%		13.00%
Income Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Cap Rate	10.50%		10.50%
Cost Approach Valuation Technique [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Accumulated Depreciation	90.10%		90.10%
Cost Approach Valuation Technique [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Accumulated Depreciation	90.10%		90.10%
Cost Approach Valuation Technique [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value Inputs, Accumulated Depreciation	90.10%		90.10%
Retained Earnings [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets			$ 3,806,000
Accounting Standards Update 2016-01 [Member] | Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [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 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	1,917,000
Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member] | Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets	$ 922,000

Fair Value (Assets And Liabilit

Fair Value (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$ 276,581	$ 169,112
Mortgage loans held for sale	6,703	4,148
Investment securities	1,393,109	1,455,660
Loans Held-for-sale, Fair Value Disclosure	6,703	4,148
Impaired Loan Fair Value	3,867	3,574
Other Assets, Fair Value Disclosure	5,196,022	5,247,021
Loans Receivable, Fair Value Disclosure	5,206,753	5,254,837
Time deposits	1,028,948	1,035,093
Other Liabilities, Fair Value Disclosure	2,674	1,269
Deposits, Fair Value Disclosure	1,031,622	1,036,362
Short Term Borrowings Fair Value	184,090	391,289
Long-term debt	425,039	504,503
Subordinated Debt Obligations, Fair Value Disclosure	13,578	13,370
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	276,581	169,112
Mortgage IRLCs	0	0
Other Liabilities, Fair Value Disclosure	2,674	1,269
Deposits, Fair Value Disclosure	2,674	1,269
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage IRLCs	161	94
Investment securities	1,393,109	1,455,660
Loans Held-for-sale, Fair Value Disclosure	6,703	4,148
Loans Receivable, Fair Value Disclosure	6,864	4,242
Time deposits	1,028,948	1,035,093
Deposits, Fair Value Disclosure	1,028,948	1,035,093
Short Term Borrowings Fair Value	184,090	391,289
Long-term debt	425,039	504,503
Subordinated Debt Obligations, Fair Value Disclosure	13,578	13,370
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage IRLCs	0	0
Impaired Loan Fair Value	3,867	3,574
Other Assets, Fair Value Disclosure	5,196,022	5,247,021
Loans Receivable, Fair Value Disclosure	5,199,889	5,250,595
Other Equity Securities [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	8,924	1,935
Other Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	8,504	1,518
Other Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	420	417
Fair Value Swap [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swap	226	226
Fair Value Swap [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swap	226	226
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage loans held for sale	6,703	4,148
Mortgage IRLCs	161	94
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Mortgage loans held for sale	6,703	4,148
Mortgage IRLCs	161	94
Fair Value, Measurements, Recurring [Member] | Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities		242,720
Fair Value, Measurements, Recurring [Member] | Obligations Of U.S. Treasury And Other U.S. Government Sponsored Entities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities		242,720
Fair Value, Measurements, Recurring [Member] | U.S. Government Sponsored Entities' Asset-Backed Securities [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	1,046,910	849,161
Fair Value, Measurements, Recurring [Member] | U.S. Government Sponsored Entities' Asset-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	1,046,910	849,161
Fair Value, Measurements, Recurring [Member] | Other Equity Securities [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	8,924	1,935
Fair Value, Measurements, Recurring [Member] | Other Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	8,504	1,518
Fair Value, Measurements, Recurring [Member] | Other Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	420	417
Fair Value, Measurements, Recurring [Member] | Fair Value Swap [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swap	226	226
Fair Value, Measurements, Recurring [Member] | Fair Value Swap [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swap	226	226
Reported Value Measurement [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	276,581	169,112
Mortgage IRLCs	161	94
Investment securities	1,394,532	1,449,078
Loans Held-for-sale, Fair Value Disclosure	6,703	4,148
Impaired Loan Fair Value	3,867	3,574
Other Assets, Fair Value Disclosure	5,232,649	5,314,679
Loans Receivable, Fair Value Disclosure	5,243,380	5,322,495
Time deposits	1,029,785	1,033,476
Other Liabilities, Fair Value Disclosure	2,674	1,269
Deposits, Fair Value Disclosure	1,032,459	1,034,745
Short Term Borrowings Fair Value	184,090	391,289
Long-term debt	425,000	500,000
Subordinated Debt Obligations, Fair Value Disclosure	15,000	15,000
Reported Value Measurement [Member] | Other Equity Securities [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Investment securities	8,924	1,935
Reported Value Measurement [Member] | Fair Value Swap [Member]
Fair Value, Assets And Liabilities Measured On Recurring Basis [Line Items]
Swap	$ 226	$ 226

Fair Value (Reconciliation Of L

Fair Value (Reconciliation Of Level 3 Input For Financial Instruments Measured On Recurring Basis) (Details) - Fair Value, Inputs, Level 3 [Member] - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning	$ 417	$ 790
Included in other comprehensive income	3	(14)
Balance, ending	420	776
Fair Value Swap [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, Beginning of Period	(226)	(226)
Included in other comprehensive income	0	0
Balance, End of Period	$ (226)	$ (226)

Fair Value (Fair Value Of Finan

Fair Value (Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and money market instruments	$ 276,581	$ 169,112
Investment securities	1,393,109	1,455,660
Federal Home Loan Bank Stock	50,086	50,086
Federal Reserve Bank Stock	8,225	8,225
Loans Held-for-sale, Fair Value Disclosure	6,703	4,148
Impaired Loan Fair Value	3,867	3,574
Other loans	5,196,022	5,247,021
Loans receivable, net	5,206,753	5,254,837
Time deposits	1,028,948	1,035,093
Other	2,674	1,269
Total deposits	1,031,622	1,036,362
Short-term borrowings	184,090	391,289
Long-term debt	425,039	504,503
Subordinated debentures/notes	13,578	13,370
Other Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	8,924	1,935
Fair Value Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Swap	226	226
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and money market instruments	276,581	169,112
Investment securities	1,394,532	1,449,078
Loans Held-for-sale, Fair Value Disclosure	6,703	4,148
Derivative Assets	161	94
Impaired Loan Fair Value	3,867	3,574
Other loans	5,232,649	5,314,679
Loans receivable, net	5,243,380	5,322,495
Time deposits	1,029,785	1,033,476
Other	2,674	1,269
Total deposits	1,032,459	1,034,745
Short-term borrowings	184,090	391,289
Long-term debt	425,000	500,000
Subordinated debentures/notes	15,000	15,000
Reported Value Measurement [Member] | Other Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	8,924	1,935
Reported Value Measurement [Member] | Fair Value Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Swap	226	226
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets	161	94
Impaired Loan Fair Value		3,574
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and money market instruments	276,581	169,112
Derivative Assets	0	0
Other	2,674	1,269
Total deposits	2,674	1,269
Fair Value, Inputs, Level 1 [Member] | Other Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	8,504	1,518
Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	1,393,109	1,455,660
Loans Held-for-sale, Fair Value Disclosure	6,703	4,148
Derivative Assets	161	94
Loans receivable, net	6,864	4,242
Time deposits	1,028,948	1,035,093
Total deposits	1,028,948	1,035,093
Short-term borrowings	184,090	391,289
Long-term debt	425,039	504,503
Subordinated debentures/notes	13,578	13,370
Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets	0	0
Impaired Loan Fair Value	3,867	3,574
Other loans	5,196,022	5,247,021
Loans receivable, net	5,199,889	5,250,595
Fair Value, Inputs, Level 3 [Member] | Other Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	420	417
Fair Value, Inputs, Level 3 [Member] | Fair Value Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Swap	$ 226	$ 226

Fair Value Qualitative informat

Fair Value Qualitative information about Level 3 fair value measurements (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans Receivable, Fair Value Disclosure	$ 5,206,753	$ 5,254,837
Impaired Loan Fair Value	3,867	3,574
Other Assets, Fair Value Disclosure	5,196,022	5,247,021
Loans Held-for-sale, Fair Value Disclosure	6,703	4,148
Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans Receivable, Fair Value Disclosure	5,199,889	5,250,595
Impaired Loan Fair Value	3,867	3,574
Other Assets, Fair Value Disclosure	5,196,022	5,247,021
Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans Receivable, Fair Value Disclosure	3,867	3,574
Other Assets, Fair Value Disclosure	6,152	6,520
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans Receivable, Fair Value Disclosure	3,867	3,574
Other Assets, Fair Value Disclosure	6,152	6,520
Fair Value, Measurements, Nonrecurring [Member] | Construction Real Estate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other Assets, Fair Value Disclosure	3,044	3,204
Fair Value, Measurements, Nonrecurring [Member] | Construction Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other Assets, Fair Value Disclosure	$ 3,044	3,204
Fair Value, Measurements, Nonrecurring [Member] | Construction Real Estate [Member] | Loans Receivable [Member] | Minimum [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	11.10%
Fair Value, Measurements, Nonrecurring [Member] | Construction Real Estate [Member] | Loans Receivable [Member] | Maximum [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	15.20%
Fair Value, Measurements, Nonrecurring [Member] | Construction Real Estate [Member] | Loans Receivable [Member] | Weighted Average [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	13.20%
Fair Value, Measurements, Nonrecurring [Member] | Construction Real Estate [Member] | Real Estate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other Assets, Fair Value Disclosure	$ 3,044	$ 3,204
Fair Value, Measurements, Nonrecurring [Member] | Construction Real Estate [Member] | Real Estate [Member] | Minimum [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	0.00%	0.00%
Fair Value, Measurements, Nonrecurring [Member] | Construction Real Estate [Member] | Real Estate [Member] | Minimum [Member] | Bulk Sale Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate		15.00%
Fair Value, Measurements, Nonrecurring [Member] | Construction Real Estate [Member] | Real Estate [Member] | Maximum [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	90.00%	90.00%
Fair Value, Measurements, Nonrecurring [Member] | Construction Real Estate [Member] | Real Estate [Member] | Maximum [Member] | Bulk Sale Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate		15.00%
Fair Value, Measurements, Nonrecurring [Member] | Construction Real Estate [Member] | Real Estate [Member] | Weighted Average [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	23.70%	24.50%
Fair Value, Measurements, Nonrecurring [Member] | Construction Real Estate [Member] | Real Estate [Member] | Weighted Average [Member] | Bulk Sale Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Discount Rate		15.00%
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans Receivable, Fair Value Disclosure	$ 3,052	$ 2,735
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans Receivable, Fair Value Disclosure	$ 3,052	2,735
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired Loan Fair Value		$ 2,735
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] | Minimum [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	0.00%	0.00%
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Cap Rate	9.00%	9.00%
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] | Minimum [Member] | Cost Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Accumulated Depreciation	90.10%	90.10%
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] | Maximum [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	65.70%	90.00%
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Cap Rate	11.00%	11.00%
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] | Maximum [Member] | Cost Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Accumulated Depreciation	90.10%	90.10%
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] | Weighted Average [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	23.30%	22.70%
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Cap Rate	9.90%	9.90%
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] | Weighted Average [Member] | Cost Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Accumulated Depreciation	90.10%	90.10%
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other Assets, Fair Value Disclosure	$ 2,295	$ 2,295
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member] | Minimum [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	0.90%	0.90%
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Cap Rate	13.00%	13.00%
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member] | Maximum [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	68.40%	68.40%
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Cap Rate	13.00%	13.00%
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member] | Weighted Average [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	34.70%	34.70%
Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Cap Rate	13.00%	13.00%
Fair Value, Measurements, Nonrecurring [Member] | Construction Real Estate - Remaining Commercial [Member] | Loans Receivable [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired Loan Fair Value		$ 127
Fair Value, Measurements, Nonrecurring [Member] | Construction Real Estate - Remaining Commercial [Member] | Loans Receivable [Member] | Minimum [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments		0.00%
Fair Value, Measurements, Nonrecurring [Member] | Construction Real Estate - Remaining Commercial [Member] | Loans Receivable [Member] | Maximum [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments		4.80%
Fair Value, Measurements, Nonrecurring [Member] | Construction Real Estate - Remaining Commercial [Member] | Loans Receivable [Member] | Weighted Average [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments		2.40%
Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other Assets, Fair Value Disclosure	$ 813	$ 1,021
Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other Assets, Fair Value Disclosure	$ 813	1,021
Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired Loan Fair Value		$ 712
Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member] | Minimum [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	0.30%	0.30%
Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member] | Minimum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Cap Rate	10.50%	10.50%
Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member] | Maximum [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	40.00%	33.00%
Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member] | Maximum [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Cap Rate	10.50%	10.50%
Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member] | Weighted Average [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	15.80%	12.50%
Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Loans Receivable [Member] | Weighted Average [Member] | Income Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Cap Rate	10.50%	10.50%
Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Real Estate [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Other Assets, Fair Value Disclosure	$ 813	$ 1,021
Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Real Estate [Member] | Minimum [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	1.20%	1.20%
Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Real Estate [Member] | Maximum [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	79.70%	79.70%
Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Real Estate [Member] | Weighted Average [Member] | Sales Comparison Approach Valuation Technique [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Comparability Adjustments	36.40%	31.80%
Construction Real Estate - Remaining Commercial [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans Receivable, Fair Value Disclosure	$ 119	$ 127
Construction Real Estate - Remaining Commercial [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans Receivable, Fair Value Disclosure	119	127
Fair Value [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Impaired Loan Fair Value		$ 3,574
Fair Value [Member] | Fair Value, Measurements, Nonrecurring [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans Receivable, Fair Value Disclosure	3,052
Fair Value [Member] | Fair Value, Measurements, Nonrecurring [Member] | Residential Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans Receivable, Fair Value Disclosure	696
Fair Value [Member] | Construction Real Estate - Remaining Commercial [Member] | Fair Value, Measurements, Nonrecurring [Member] | Construction Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Loans Receivable, Fair Value Disclosure	$ 119

Fair Value Fair Value (Assets a

Fair Value Fair Value (Assets and liabilities measured at fair value on a nonrecurring basis) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	$ 6,703	$ 4,148
Loans Receivable, Fair Value Disclosure	5,206,753	5,254,837
Other Assets, Fair Value Disclosure	5,196,022	5,247,021
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	6,703	4,148
Loans Receivable, Fair Value Disclosure	6,864	4,242
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	5,199,889	5,250,595
Other Assets, Fair Value Disclosure	5,196,022	5,247,021
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	3,867	3,574
Servicing Asset at Fair Value, Amount	1,537	7,316
Other Assets, Fair Value Disclosure	6,152	6,520
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Servicing Asset at Fair Value, Amount	1,537	7,316
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	3,867	3,574
Other Assets, Fair Value Disclosure	6,152	6,520
Commercial Real Estate Portfolio Segment [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	3,052	2,735
Commercial Real Estate Portfolio Segment [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	3,052	2,735
Residential Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	813	1,021
Residential Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	813	1,021
Construction Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	3,044	3,204
Construction Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	3,044	3,204
Commercial Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	2,295	2,295
Commercial Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Assets, Fair Value Disclosure	2,295	2,295
Residential Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	696	712
Residential Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	696	712
Construction Real Estate - Remaining Commercial [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	119	127
Construction Real Estate - Remaining Commercial [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	119	127
Reported Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	6,703	4,148
Loans Receivable, Fair Value Disclosure	5,243,380	5,322,495
Other Assets, Fair Value Disclosure	5,232,649	$ 5,314,679
Fair Value [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	3,052
Fair Value [Member] | Residential Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	696
Fair Value [Member] | Construction Real Estate - Remaining Commercial [Member] | Construction Real Estate [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Receivable, Fair Value Disclosure	$ 119

Fair Value Fair Value (Impaired

Fair Value Fair Value (Impaired Financing Receivables Additional Information) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Schedule of Impaired Financing Receivables Additional Information [Line Items]
Book Value Of Impaired Loans Carried At Fair Value	$ 3,908	$ 3,577
Partial Charge-Offs On Impaired Loans carried at Fair Value	2,734	2,780
Impaired Financing Receivable, Related Allowance	1,207	684
impaired Financing Receivable, loans not held at Fair Value, Carrying Amount	45,248	52,306
Impaired Financing Receivable, Recorded Investment	50,322	56,564	$ 70,127
Impaired Loan Fair Value	3,867	3,574
Impaired Financing Receivable, loans not held at Fair Value, Recorded Investment	46,414	52,987
Partial Charge-offs on Impaired Loans carried at Cost	7,238	7,260
Impaired Financing Receivable, Carrying Value	49,115	55,880
Partial Charge-Offs On Impaired Loans	9,972	10,040
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	1,207	684
Financing Receivable, not collateral dependent [Domain]
Schedule of Impaired Financing Receivables Additional Information [Line Items]
Impaired Financing Receivable, Related Allowance	1,166	681
Commercial Receivables, excluding Commercial, Financial, and Agricultural [Domain]
Schedule of Impaired Financing Receivables Additional Information [Line Items]
Impaired Financing Receivable, Related Allowance	$ 41	$ 3

Other Comprehensive Income (L80

Other Comprehensive Income (Loss) (Component Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	$ 2,562
Other comprehensive loss before reclassifications	(23,410)	$ 1,022
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	(3,175)	0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax	(2,024)	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(2,024)	0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(23,012)	1,022
Other comprehensive income (loss)	(21,386)	1,022
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax	(23,410)	1,022
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax		0
Changes in pension plan assets and benefit obligations, Net-of-tax amount	(26,701)	(14,740)	$ 23,526	$ 14,740
Unrealized gains on available-for-sale securities, Net-of-tax amount	(25,940)	(1,983)	(2,928)	(3,005)
Total accumulated other comprehensive income (loss), Net-of-tax amount	(52,641)	(16,723)	(26,454)	$ (17,745)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax		$ 0
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [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 Net Investment Gain (Loss) Attributable to Parent [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 Income (loss) [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			(3,806)
Accounting Standards Update 2016-01 [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	$ (26,187)
Accounting Standards Update 2016-01 [Member] | Accumulated Other Comprehensive Income (loss) [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)

Investment in Qualified Affor81

Investment in Qualified Affordable Housing Investment in Qualified Affordable Housing (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Amortization Method Qualified Affordable Housing Project Investments, Amortization	$ 1,851	$ 1,864
Affordable housing tax credit investments	47,818		$ 49,669
Affordable Housing Program Obligation	14,282		$ 14,282
Affordable Housing Tax Credits and Other Tax Benefits, Amount	$ 2,700	$ 2,400

Repurchase Agreement Borrowin82

Repurchase Agreement Borrowings Repurchase Agreement Borrowings (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	$ 184,090	$ 183,289
Pledged Assets Separately Reported, Securities Pledged for Repurchase Agreements, at Fair Value	207,000	213,000
Available unpledged securities	882,000	975,000
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	182,986	182,185
Maturity up to 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 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 over 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	$ 1,104	$ 1,104

Contingent Liabilities Contin83

Contingent Liabilities Contingent Liabilities (Details) - USD ($)	Mar. 31, 2018	Mar. 31, 2017
Loss Contingencies [Line Items]
Loss Contingency Accrual	$ 20,000	$ 2,300,000

Revenue from Contracts with C84

Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Other service income	$ 4,172	$ 2,804
Personal trust and agency accounts	2,126	1,786
Employee benefit and retirement-related accounts	1,643	1,450
Investment management and investment advisory agency accounts	2,244	1,968
Other	382	310
Non-sufficient funds (NSF) fees	1,834	1,985
Demand deposit account (DDA) charges	926	985
Other	162	169
Credit card	511	420
HELOC	99	91
Installment	64	158
Real estate	2,246	1,812
Commercial	1,252	323
Checkcard fee income	4,002	3,761
Bank owned life insurance income	1,009	1,103
ATM Fees	524	542
OREO valuation adjustments	(207)	(73)
Gain on sale of OREO, net	4,321	100
Other components of net periodic benefit income	1,705	1,448
Other	842	617
Total other income	26,903	18,955
Net loss on sale of investment securities (2)	(2,271)
Unrealized gain loss on equity securities	(3,489)	0
Within Scope [Domain]
Disaggregation of Revenue [Line Items]
Other service income	3,100	1,900
Out of Scope [Domain]
Disaggregation of Revenue [Line Items]
Other service income	1,100	900
PNB [Member]
Disaggregation of Revenue [Line Items]
Personal trust and agency accounts	2,126	1,786
Employee benefit and retirement-related accounts	1,643	1,450
Investment management and investment advisory agency accounts	2,244	1,968
Other	382	310
Non-sufficient funds (NSF) fees	1,834	1,985
Demand deposit account (DDA) charges	926	985
Other	162	169
Credit card	504	420
HELOC	99	91
Installment	64	158
Real estate	2,246	1,812
Commercial	242	323
Checkcard fee income	4,002	3,761
Bank owned life insurance income	922	1,007
ATM Fees	524	542
OREO valuation adjustments	30	73
Gain on sale of OREO, net	1,585	100
Other components of net periodic benefit income	1,652	1,403
Other	1,032	917
Total other income	19,915	19,114
Net loss on sale of investment securities (2)	(2,271)
Unrealized gain loss on equity securities	27
GFSC [Member]
Disaggregation of Revenue [Line Items]
Personal trust and agency accounts	0	0
Employee benefit and retirement-related accounts	0	0
Investment management and investment advisory agency accounts	0	0
Other	0	0
Non-sufficient funds (NSF) fees	0	0
Demand deposit account (DDA) charges	0	0
Other	0	0
Credit card	7	0
HELOC	0	0
Installment	0	0
Real estate	0	0
Commercial	0	0
Checkcard fee income	0	0
Bank owned life insurance income	0	0
ATM Fees	0	0
OREO valuation adjustments	0	0
Gain on sale of OREO, net	0	0
Other components of net periodic benefit income	19	16
Other	4	0
Total other income	30	16
Net loss on sale of investment securities (2)	0
Unrealized gain loss on equity securities	0
SEPH [Member]
Disaggregation of Revenue [Line Items]
Personal trust and agency accounts	0	0
Employee benefit and retirement-related accounts	0	0
Investment management and investment advisory agency accounts	0	0
Other	0	0
Non-sufficient funds (NSF) fees	0	0
Demand deposit account (DDA) charges	0	0
Other	0	0
Credit card	0	0
HELOC	0	0
Installment	0	0
Real estate	0	0
Commercial	1,010	0
Checkcard fee income	0	0
Bank owned life insurance income	0	0
ATM Fees	0	0
OREO valuation adjustments	177	0
Gain on sale of OREO, net	2,736	0
Other components of net periodic benefit income	34	29
Other	(16)	0
Total other income	3,587	29
Net loss on sale of investment securities (2)	0
Unrealized gain loss on equity securities	0
All Other [Member]
Disaggregation of Revenue [Line Items]
Personal trust and agency accounts	0	0
Employee benefit and retirement-related accounts	0	0
Investment management and investment advisory agency accounts	0	0
Other	0	0
Non-sufficient funds (NSF) fees	0	0
Demand deposit account (DDA) charges	0	0
Other	0	0
Credit card	0	0
HELOC	0	0
Installment	0	0
Real estate	0	0
Commercial	0	0
Checkcard fee income	0	0
Bank owned life insurance income	87	96
ATM Fees	0	0
OREO valuation adjustments	0	0
Gain on sale of OREO, net	0	0
Other components of net periodic benefit income	0	0
Other	(178)	(300)
Total other income	3,371	$ (204)
Net loss on sale of investment securities (2)	0
Unrealized gain loss on equity securities	$ 3,462

Subsequent events Subsequent 85

Subsequent events Subsequent events (Details) - $ / shares	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2018
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.94	$ 0.94
Subsequent Event [Member]
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared			$ 0.96
One time dividend [Domain] | Subsequent Event [Member]
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared			$ 0.25