The First of Long Island Corporation (FLIC) 10-Q 9 Nov 18 2018 Q3 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 31, 2018
Document And Entity Information
Entity Registrant Name	FIRST OF LONG ISLAND CORP
Entity Central Index Key	740,663
Trading Symbol	flic
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding (in shares)		25,487,113
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets:
Cash and cash equivalents	$ 50,462	$ 69,672
Investment securities:
Held-to-maturity, at amortized cost (fair value of $6,902 and $7,749)	6,845	7,636
Available-for-sale securities, fair value	802,839	720,128
Total securities	809,684	727,764
Loans held-for-sale	671
Loans:
Commercial and industrial	93,901	109,623
Secured by real estate:
Commercial mortgages	1,259,286	1,193,007
Residential mortgages	1,788,145	1,558,564
Home equity lines	74,079	83,625
Consumer and other	5,884	5,533
Total Loans	3,221,295	2,950,352
Allowance for loan losses	(33,551)	(33,784)
Total	3,187,744	2,916,568
Restricted stock, at cost	37,941	37,314
Bank premises and equipment, net	39,825	39,648
Bank-owned life insurance	80,380	59,665
Pension plan assets, net	19,391	19,152
Deferred income tax benefit	4,491
Other assets	19,406	24,925
Total assets	4,249,995	3,894,708
Deposits:
Checking	946,236	896,129
Savings, NOW and money market	1,679,617	1,602,460
Time, $100,000 and over	291,638	203,890
Time, other	243,018	119,518
Total	3,160,509	2,821,997
Short-term borrowings	292,176	281,141
Long-term debt	403,027	423,797
Accrued expenses and other liabilities	14,013	10,942
Deferred income taxes payable		2,381
Total liabilities	3,869,725	3,540,258
Stockholders' Equity:
Common stock, par value $.10 per share: Authorized, 80,000,000 shares; Issued and outstanding, 25,422,995 and 24,668,390 shares	2,542	2,467
Surplus	145,023	127,122
Retained earnings	244,173	224,315
Total	391,738	353,904
Accumulated other comprehensive income (loss), net of tax	(11,468)	546
Total	380,270	354,450
Total	$ 4,249,995	$ 3,894,708

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Consolidated Balance Sheets [Abstract]
Held-to-Maturity Securities, Fair Value	$ 6,902	$ 7,749
Common stock, par value (in dollars per share)	$ 0.10	$ 0.10
Common stock, shares authorized (in shares)	80,000,000	80,000,000
Common stock, shares issued (in shares)	25,422,995	24,668,390
Common stock, shares outstanding (in shares)	25,422,995	24,668,390

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Interest and dividend income:
Loans	$ 28,471	$ 25,173	$ 83,641	$ 71,810
Taxable	3,065	1,806	8,275	5,883
Nontaxable	3,323	3,358	10,193	10,112
Total interest and dividend income	34,859	30,337	102,109	87,805
Interest expense:
Savings, NOW and money market deposits	3,125	1,909	8,823	4,974
Time deposits	2,952	1,437	7,529	3,986
Short-term borrowings	1,370	257	3,026	986
Long-term debt	2,121	2,031	6,399	5,703
Total interest expense	9,568	5,634	25,777	15,649
Net interest income	25,291	24,703	76,332	72,156
Provision (credit) for loan losses	(1,768)	1,122	547	3,203
Net interest income after provision (credit) for loan losses	27,059	23,581	75,785	68,953
Noninterest income:
Investment Management Division income	508	515	1,665	1,565
Service charges on deposit accounts	658	725	1,945	2,119
Net gain (losses) on sales of securities	(4,960)	16	(4,960)	74
Other	1,569	1,244	5,096	3,877
Total	(2,225)	2,500	3,746	7,635
Noninterest expense:
Salaries	6,596	6,386	20,895	18,855
Employee benefits and other personnel expense	2,037	1,866	6,452	5,516
Occupancy and equipment	2,864	2,503	8,742	7,524
Other	2,745	2,639	8,728	8,314
Total Noninterest Expense	14,242	13,394	44,817	40,209
Income before income taxes	10,592	12,687	34,714	36,379
Income tax expense	535	3,345	3,231	8,823
Net income	$ 10,057	$ 9,342	$ 31,483	$ 27,556
Earnings per share:
Basic	$ 0.39	$ 0.38	$ 1.24	$ 1.14
Diluted	0.39	0.38	1.24	1.13
Cash dividends declared per share	$ 0.17	$ 0.15	$ 0.47	$ 0.43

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 10,057	$ 9,342	$ 31,483	$ 27,556
Other comprehensive income (loss):
Change in net unrealized holding gains (losses) on available-for-sale securities	(2,271)	(577)	(17,099)	4,774
Change in funded status of pension plan		4		13
Change in net unrealized gain on derivative instrument	687		281
Other comprehensive income (loss) before income taxes	(1,584)	(573)	(16,818)	4,787
Income tax expense (benefit)	(479)	(240)	(5,081)	2,010
Other comprehensive income (loss)	(1,105)	(333)	(11,737)	2,777
Comprehensive income	$ 8,952	$ 9,009	$ 19,746	$ 30,333

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]		Total
Balance (in shares) at Dec. 31, 2016	23,699,107
Balance at Dec. 31, 2016	$ 2,370	$ 101,738	$ 203,326	$ (1,604)		$ 305,830
Net income			27,556			27,556
Other comprehensive income (loss)				2,777		2,777
Shares withheld upon the vesting and conversion of RSUs (in shares)	(19,339)
Shares withheld upon the vesting and conversion of RSUs	$ (2)	(525)				(527)
Common stock issued under stock compensation plans (in shares)	127,347
Common stock issued under stock compensation plans	$ 13	632				645
Common stock issued under dividend reinvestment and stock purchase plan (in shares)	575,672
Common stock issued under dividend reinvestment and stock purchase plan	$ 57	15,115				15,172
Stock-based compensation		1,925				1,925
Cash dividends declared			(10,421)			(10,421)
Balance (in shares) at Sep. 30, 2017	24,382,787
Balance at Sep. 30, 2017	$ 2,438	118,885	220,461	1,173		342,957
Balance (in shares) at Dec. 31, 2017	24,668,390
Balance at Dec. 31, 2017	$ 2,467	127,122	224,315	546		354,450
Net income			31,483			31,483
Other comprehensive income (loss)				(11,737)		(11,737)
Reclassification of stranded tax effects upon the adoption of ASU 2018-02			277	(277)	[1]
Shares tendered upon the exercise of stock options	$ (1)	(365)				$ (366)
Shares tendered upon the exercise of stock options (in shares)	(14,549)
Shares tendered upon the exercise of stock options (in shares)						48,158
Shares withheld upon the vesting and conversion of RSUs (in shares)	(27,194)
Shares withheld upon the vesting and conversion of RSUs	$ (3)	(764)				$ (767)
Common stock issued under stock compensation plans (in shares)	156,514
Common stock issued under stock compensation plans	$ 15	551				566
Common stock issued under dividend reinvestment and stock purchase plan (in shares)	639,834
Common stock issued under dividend reinvestment and stock purchase plan	$ 64	16,953				17,017
Stock-based compensation		1,526				1,526
Cash dividends declared			(11,902)			(11,902)
Balance (in shares) at Sep. 30, 2018	25,422,995
Balance at Sep. 30, 2018	$ 2,542	$ 145,023	$ 244,173	$ (11,468)		$ 380,270
[1]	The adoption of Accounting Standards Update ("ASU") 2018-02 "Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income" in the first quarter of 2018 allowed the Corporation to reclassify certain stranded tax effects arising from the enactment of the Tax Cuts and Jobs Act ("Tax Act") in December 2017 from accumulated other comprehensive income to retained earnings. See "Note 11 - Adoption of New Accounting Standards" for more information regarding the effects of adopting ASU 2018-02.

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash Flows From Operating Activities:
Net income	$ 31,483,000	$ 27,556,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	547,000	3,203,000
Credit for deferred income taxes	(1,791,000)	(1,298,000)
Depreciation and amortization	3,031,000	2,577,000
Premium amortization on investment securities, net	1,458,000	2,370,000
Net losses (gains) on sales of securities	4,960,000	(74,000)
Stock-based compensation expense	1,526,000	1,925,000
Common stock issued in lieu of cash for director fees	47,000	41,000
Accretion of cash surrender value on bank-owned life insurance	(1,589,000)	(1,157,000)
Net pension credit	(239,000)	(88,000)
Decrease in other assets	1,549,000	94,000
Increase in accrued expenses and other liabilities	2,431,000	330,000
Net cash provided by operating activities	43,413,000	35,479,000
Proceeds from sales of investment securities:
Held-to-maturity		355,000
Available-for-sale	169,631,000	49,077,000
Proceeds from maturities and redemptions of investment securities:
Held-to-maturity	3,786,000	4,422,000
Available-for-sale	60,152,000	81,489,000
Purchases of investment securities:
Held-to-maturity	(2,955,000)	(2,398,000)
Available-for-sale	(336,051,000)	(35,829,000)
Net increase in loans	(272,394,000)	(291,997,000)
Proceeds from sale of other real estate owned	5,125,000
Net (increase) decease in restricted stock	(627,000)	3,082,000
Purchases of premises and equipment, net	(3,208,000)	(5,209,000)
Purchases of bank-owned life insurance	(20,000,000)	(25,000,000)
Net cash used in investing activities	(396,541,000)	(222,008,000)
Cash Flows From Financing Activities:
Net increase in deposits	338,512,000	251,621,000
Net increase (decrease) in short-term borrowings	11,035,000	(115,093,000)
Proceeds from long-term debt	39,680,000	66,650,000
Repayment of long-term debt	(60,450,000)	(18,900,000)
Proceeds from issuance of common stock, net	17,017,000	15,172,000
Proceeds from exercise of stock options	153,000	604,000
Shares withheld upon the vesting and conversion of RSUs	(767,000)	(527,000)
Cash dividends paid	(11,262,000)	(10,047,000)
Net cash provided by financing activities	333,918,000	189,480,000
Net increase (decrease) in cash and cash equivalents	(19,210,000)	2,951,000
Cash and cash equivalents, beginning of year	69,672,000	36,929,000
Cash and cash equivalents, end of period	50,462,000	39,880,000
Supplemental Cash Flow Disclosures:
Cash paid for interest	25,261,000	15,570,000
Cash paid for income taxes	2,490,000	9,378,000
Noncash investing and financing activities:
Cash dividends payable	$ 4,438,000	$ 3,742,000

Basis Of Presentation

Basis Of Presentation	9 Months Ended
	Sep. 30, 2018
Basis Of Presentation [Abstract]
Basis Of Presentation	1 - BASIS OF PRESENTATION  The accounting and reporting policies of The First of Long Island Corporation (“Corporation”) reflect banking industry practice and conform to generally accepted accounting principles (“GAAP”) in the United States. In preparing the consolidated financial statements, management is required to make estimates, such as the allowance for loan losses, and assumptions that affect the reported asset and liability balances, revenue and expense amounts, and the disclosure of contingent assets and liabilities. Actual results could differ significantly from those estimates.  The consolidated financial statements include the accounts of the Corporation and its wholly-owned subsidiary, The First National Bank of Long Island (“Bank”). The Bank has two wholly owned subsidiaries: FNY Service Corp., an investment company, and The First of Long Island Agency, Inc. The Bank and FNY Service Corp. jointly own another subsidiary, The First of Long Island REIT, Inc., a real estate investment trust (“REIT”) . The consolidated entity is referred to as the “Corporation” and the Bank and its subsidiaries are collectively referred to as the “Bank.” All intercompany balances and amounts have been eliminated. For further information refer to the consolidated financial statements and notes thereto included in the Corporation's Annual Report on Form 10-K for the year ended December 31, 2017 .  The consolidated financial information included herein as of and for the periods ended September 30, 2018 and 2017 is unaudited. However, such information reflects all adjustments which are, in the opinion of management, necessary for a fair statement of results for the interim periods. The December 31, 2017 consolidated balance sheet was derived from the Corporation's December 31, 2017 audited consolidated financial statements. When appropriate, items in the prior year financial statements are reclassified to conform to the current period presentation. 

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Earnings Per Share	2 - EARNINGS PER SHARE  The following table sets forth the calculation of basic and diluted earnings per share (“EPS”) for the periods indicated.      Nine Months Ended Three Months Ended  September 30, September 30,  (dollars in thousands, except per share data) 2018 2017 2018 2017  Net income $ 31,483 $ 27,556 $ 10,057 $ 9,342  Income allocated to participating securities (1) 86 101 26 34  Income allocated to common stockholders $ 31,397 $ 27,455 $ 10,031 $ 9,308   Weighted average:  Common shares 25,236,889 24,096,079 25,409,087 24,332,939  Dilutive stock options and restricted stock units (1) 174,095 253,715 144,933 247,127  25,410,984 24,349,794 25,554,020 24,580,066  Earnings per share:  Basic $1.24 $1.14 $.39 $.38  Diluted 1.24 1.13 .39 .38  (1) Restricted stock units (“RSUs”) awarded in 2016 accrue dividends at the same rate as the dividends declared by the Board of Directors on the Corporation’s common stock. For purposes of computing EPS, these RSUs are considered to participate with common stock in the earnings of the Corporation and, therefore, the Corporation calculates basic and diluted EPS using the two-class method. Under the two-class method, net income for the period is allocated between common stockholders and participating securities according to dividends declared and participation rights in undistributed earnings. As a result, the RSUs awarded in 2016 are not included in the weighted average “dilutive stock options and restricted stock units” in the table above.

Comprehensive Income

Comprehensive Income	9 Months Ended
	Sep. 30, 2018
Comprehensive Income [Abstract]
Comprehensive Income	3 - COMPREHENSIVE INCOME  Comprehensive income includes net income and other comprehensive income (loss). Other comprehensive income (loss) includes revenues, expenses, gains and losses that under GAAP are included in comprehensive income but excluded from net income. Other comprehensive income (loss) for the Corporation consists of unrealized holding gains or losses on available-for-sale securities and derivative instruments and changes in the funded status of the Bank’s defined benefit pension plan, all net of related income taxes. Accumulated other comprehensive income (loss) is recognized as a separate component of stockholders’ equity.  The components of other comprehensive income (loss) and the related tax effects are as follows:     Nine Months Ended Three Months Ended  September 30, September 30,  (in thousands) 2018 2017 2018 2017  Change in net unrealized holding gains (losses) on  available-for-sale securities:  Change arising during the period $ (22,059) $ 4,847 $ (7,231) $ (561)  Reclassification adjustment for net (gains) losses  included in net income (1) 4,960 (73) 4,960 (16)  (17,099) 4,774 (2,271) (577)  Tax effect (5,166) 2,004 (686) (242)  (11,933) 2,770 (1,585) (335)  Change in funded status of pension plan:  Amortization of net actuarial loss included in net income (2) — 13 — 4  Tax effect — 6 — 2  — 7 — 2  Change in unrealized gain on derivative instrument:  Amount of gain (loss) recognized during the period (34) — 462 —  Reclassification adjustment for net interest expense  included in net income (3) 315 — 225 —  281 — 687 —  Tax effect 85 — 207 —  196 — 480 —   Other comprehensive income (loss) $ (11,737) $ 2,777 $ (1,105) $ (333)  (1) Represents net realized gains or losses arising from the sale of available-for-sale securities. The net realized gains or losses are included in the consolidated statements of income in the line item, “Net gains (losses) on sales of securities.” See “Note 4 – Investment Securities” for the income tax expense or benefit related to the net realized gains or losses , which is included in the consolidated statements of income in the line item, “Income tax expense.”  (2) Represents the amortization of net actuarial loss relating to the Corporation’s defined benefit pension plan. This item is a component of net periodic pension cost (see “Note 7 – Defined Benefit Pension Plan”) .  (3) Represents the net interest expense recorded on a derivative transaction and included in the consolidated statements of income in the line item “Interest expense – short-term borrowings.”  The following table sets forth the components of accumulated other comprehensive income (loss), net of tax:      Current Period Change due to  Other Adoption  Balance Comprehensive of ASU Balance  (in thousands) 12/31/17 Income (Loss) 2018-02 (1) 9/30/18  Unrealized holding gains (losses) on available-for-sale securities $ 2,600 $ (11,933) $ 361 $ (8,972)  Unrealized actuarial losses on pension plan (2,054) — (638) (2,692)  Unrealized gain on derivative instrument — 196 — 196  Accumulated other comprehensive income (loss), net of tax $ 546 $ (11,737) $ (277) $ (11,468)  (1) The adoption of Accounting Standards Update (“ASU”) 2018-02 “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income” in the first quarter of 2018 allowed the Corporation to reclassify certain stranded tax effects arising from the enactment of the Tax Cuts and Jobs Act (“Tax Act”) in December 2017 from accumulated other comprehensive income to retained earnings. See “Note 11 – Adoption of New Accounting Standards” for more information regarding the effects of adopting ASU 2018-02.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2018
Investment Securities [Abstract]
Investment Securities	4 - INVESTMENT SECURITIES  The following tables set forth the amortized cost and estimated fair values of the Bank’s investment securities.      September 30, 2018  Gross Gross  Amortized Unrealized Unrealized Fair  (in thousands) Cost Gains Losses Value  Held-to-Maturity Securities:  State and municipals $ 6,412 $ 42 $ — $ 6,454  Pass-through mortgage securities 274 12 — 286  Collateralized mortgage obligations 159 3 — 162  $ 6,845 $ 57 $ — $ 6,902  Available-for-Sale Securities:  State and municipals $ 428,977 $ 2,966 $ (8,151) $ 423,792  Pass-through mortgage securities 74,576 4 (2,146) 72,434  Collateralized mortgage obligations 252,129 — (5,516) 246,613  Corporate bonds 60,000 — — 60,000  $ 815,682 $ 2,970 $ (15,813) $ 802,839   December 31, 2017  Held-to-Maturity Securities:  State and municipals $ 6,970 $ 78 $ — $ 7,048  Pass-through mortgage securities 311 21 — 332  Collateralized mortgage obligations 355 14 — 369  $ 7,636 $ 113 $ — $ 7,749  Available-for-Sale Securities:  State and municipals $ 453,158 $ 10,051 $ (1,886) $ 461,323  Pass-through mortgage securities 72,539 84 (1,232) 71,391  Collateralized mortgage obligations 190,175 15 (2,776) 187,414  $ 715,872 $ 10,150 $ (5,894) $ 720,128  At September 30, 2018 and December 31, 2017 , investment securities with a carrying value of $463,501,000 and $423,360,000 , respectively, were pledged as collateral to secure public deposits and borrowed funds.  There were no holdings of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of stockholders’ equity at September 30, 2018 and December 31, 2017 .  Securities With Unrealized Losses. The following tables set forth securities with unrealized losses presented by the length of time the securities have been in a continuous unrealized loss position.      September 30, 2018  Less than 12 Months  12 Months or More Total  Fair Unrealized Fair Unrealized Fair Unrealized  (in thousands) Value Loss Value Loss Value Loss  State and municipals $ 175,087 $ (4,533) $ 34,708 $ (3,618) $ 209,795 $ (8,151)  Pass-through mortgage securities 51,251 (886) 19,965 (1,260) 71,216 (2,146)  Collateralized mortgage obligations 187,737 (3,844) 28,351 (1,672) 216,088 (5,516)  Total temporarily impaired $ 414,075 $ (9,263) $ 83,024 $ (6,550) $ 497,099 $ (15,813)   December 31, 2017  State and municipals $ 54,732 $ (574) $ 28,723 $ (1,312) $ 83,455 $ (1,886)  Pass-through mortgage securities 10,172 (81) 52,652 (1,151) 62,824 (1,232)  Collateralized mortgage obligations 130,267 (1,230) 54,751 (1,546) 185,018 (2,776)  Total temporarily impaired $ 195,171 $ (1,885) $ 136,126 $ (4,009) $ 331,297 $ (5,894)  Because the unrealized losses reflected in the preceding tables are deemed by management to be attributable to changes in interest rates and not credit losses, and because management does not have the intent to sell these securities and it is not more likely than not that it will be required to sell these securities before their anticipated recovery, the Bank does not consider these securities to be other-than-temporarily impaired at September 30, 2018 . See “Note 13 – Subsequent Events” for information on a sale of available-for-sale securities in the fourth quarter of 2018.  Sales of Available-for-Sale Securities. Sales of available-for-sale securities were as follows:      Nine Months Ended Three Months Ended  (in thousands) September 30, September 30,  2018 2017 2018 2017   Proceeds $ 169,631 $ 49,077 $ 169,631 $ 9,066   Gross gains $ 300 $ 382 $ 300 $ 16  Gross losses (5,260) (309) (5,260) —  Net gain (loss) $ (4,960) $ 73 $ (4,960) $ 16  Income tax benefit related to the net realized lo s ses for the n ine and three months ended September 30, 2018 was $1,495,000 . Income tax expense related to the net realized gains for the nine and three months ended September 30, 2017 was $31,000 and $7,000 , respectively.  Sales of Held-to-Maturity Securities. There were no sales of held-to-maturity securities during the n ine months ended September 30, 2018. During the second quarter of 2017, the Bank sold one municipal security that was classified as held-to-maturity. The sale was in response to a significant deterioration in the creditworthiness of the issuer. The security sold had a carrying value of $354,000 at the time of sale and the Bank realized a gain upon sale of $1,000 .  Maturities. The following table sets forth by maturity the amortized cost and fair value of the Bank’s state and municipal securities and corporate bonds at September 30, 2018 based on the earlier of their stated maturity or, if applicable, their pre-refunded date. The remaining securities in the Bank’s investment securities portfolio are mortgage-backed securities, consisting of pass-through mortgage securities and collateralized mortgage obligations. Although these securities are expected to have substantial periodic repayments they are reflected in the table below in aggregate amounts.      (in thousands) Amortized Cost Fair Value  Held-to-Maturity Securities:  Within one year $ 4,335 $ 4,339  After 1 through 5 years 2,077 2,115  After 5 through 10 years — —  After 10 years — —  Mortgage-backed securities 433 448  $ 6,845 $ 6,902  Available-for-Sale Securities:  Within one year $ 46,642 $ 47,179  After 1 through 5 years 37,623 37,733  After 5 through 10 years 227,010 225,866  After 10 years 177,702 173,014  Mortgage-backed securities 326,705 319,047  $ 815,682 $ 802,839 

Loans

Loans	9 Months Ended
	Sep. 30, 2018
Loans [Abstract]
Loans	5 - LOANS  The following tables set forth by class of loans the amount of loans individually and collectively evaluated for impairment and the portion of the allowance for loan losses allocable to such loans.     September 30, 2018  Loans Allowance for Loan Losses  (in thousands) Individually Evaluated for Impairment Collectively Evaluated for Impairment Ending Balance Individually Evaluated for Impairment Collectively Evaluated for Impairment Ending Balance  Commercial and industrial $ 53 $ 93,848 $ 93,901 $ — $ 1,152 $ 1,152  Commercial mortgages:  Multifamily — 733,132 733,132 — 6,497 6,497  Other 2,777 426,987 429,764 — 4,196 4,196  Owner-occupied 522 95,868 96,390 — 826 826  Residential mortgages:  Closed end 970 1,787,175 1,788,145 16 20,295 20,311  Revolving home equity 756 73,323 74,079 — 507 507  Consumer and other 333 5,551 5,884 — 62 62  $ 5,411 $ 3,215,884 $ 3,221,295 $ 16 $ 33,535 $ 33,551   December 31, 2017  Commercial and industrial $ 48 $ 109,575 $ 109,623 $ — $ 1,441 $ 1,441  Commercial mortgages:  Multifamily — 682,593 682,593 — 6,423 6,423  Other — 414,783 414,783 — 4,734 4,734  Owner-occupied 531 95,100 95,631 — 1,076 1,076  Residential mortgages:  Closed end 1,368 1,557,196 1,558,564 18 19,329 19,347  Revolving home equity — 83,625 83,625 — 689 689  Consumer and other — 5,533 5,533 — 74 74  $ 1,947 $ 2,948,405 $ 2,950,352 $ 18 $ 33,766 $ 33,784  The following tables present the activity in the allowance for loan losses for the periods indicated.     (in thousands) Balance at 1/1/18 Chargeoffs Recoveries Provision for Loan Losses (Credit) Balance at 9/30/18  Commercial and industrial $ 1,441 $ 482 $ 6 $ 187 $ 1,152  Commercial mortgages:  Multifamily 6,423 — — 74 6,497  Other 4,734 — — (538) 4,196  Owner-occupied 1,076 — — (250) 826  Residential mortgages:  Closed end 19,347 413 101 1,276 20,311  Revolving home equity 689 138 150 (194) 507  Consumer and other 74 4 — (8) 62  $ 33,784 $ 1,037 $ 257 $ 547 $ 33,551   Balance at 7/1/18 Chargeoffs Recoveries Provision for Loan Losses (Credit) Balance at 9/30/18  Commercial and industrial $ 1,298 $ 178 $ — $ 32 $ 1,152  Commercial mortgages:  Multifamily 7,048 — — (551) 6,497  Other 4,768 — — (572) 4,196  Owner-occupied 911 — — (85) 826  Residential mortgages:  Closed end 20,953 393 1 (250) 20,311  Revolving home equity 775 89 150 (329) 507  Consumer and other 79 4 — (13) 62  $ 35,832 $ 664 $ 151 $ (1,768) $ 33,551      (in thousands) Balance at 1/1/17 Chargeoffs Recoveries Provision for Loan Losses (Credit) Balance at 9/30/17  Commercial and industrial $ 1,408 $ 102 $ 10 $ 341 $ 1,657  Commercial mortgages:  Multifamily 6,119 — — (221) 5,898  Other 4,296 — — 451 4,747  Owner-occupied 959 — — 616 1,575  Residential mortgages:  Closed end 15,740 — 3 2,362 18,105  Revolving home equity 1,401 — — (311) 1,090  Consumer and other 134 27 2 (35) 74  $ 30,057 $ 129 $ 15 $ 3,203 $ 33,146   Balance at 7/1/17 Chargeoffs Recoveries Provision for Loan Losses (Credit) Balance at 9/30/17  Commercial and industrial $ 1,544 $ 96 $ 3 $ 206 $ 1,657  Commercial mortgages:  Multifamily 5,921 — — (23) 5,898  Other 4,674 — — 73 4,747  Owner-occupied 1,685 — — (110) 1,575  Residential mortgages:  Closed end 17,035 — 1 1,069 18,105  Revolving home equity 1,203 — — (113) 1,090  Consumer and other 74 21 1 20 74  $ 32,136 $ 117 $ 5 $ 1,122 $ 33,146  For individually impaired loans, the following tables set forth by class of loans at September 30, 2018 and December 31, 2017 the recorded investment, unpaid principal balance and related allowance. The tables also set forth the average recorded investment of individually impaired loans and interest income recognized while the loans were impaired during the n ine and three months ended September 30, 2018 and 2017 . The recorded investment is the unpaid principal balance of the loans less any interest payments applied to principal and any direct chargeoffs plus o r minus net deferred loan costs and fees. Any principal and interest payments received on nonaccrual impaired loans are applied to the recorded investment in the loans. The Bank recognizes interest income on other impaired loans using the accrual method of accounting.                             Nine Months Ended Three Months Ended  September 30, 2018 September 30, 2018 September 30, 2018  Unpaid Average Interest Average Interest  Recorded Principal Related Recorded Income Recorded Income  (in thousands) Investment Balance Allowance Investment Recognized Investment Recognized  With no related allowance recorded:  Commercial and industrial $ 53 $ 53 $ — $ 82 $ 2 $ 55 $ —  Commercial mortgages:  Other 2,777 2,777 — 2,800 — 2,777 —  Owner-occupied 522 606 — 534 18 523 6  Residential mortgages:  Closed end 712 738 — 751 4 718 1  Revolving home equity 756 751 — 757 — 756 —  Consumer and other 333 333 — 266 12 336 6  With an allowance recorded:  Residential mortgages - closed end 258 257 16 270 9 259 3  Total:  Commercial and industrial 53 53 — 82 2 55 —  Commercial mortgages:  Other 2,777 2,777 — 2,800 — 2,777 —  Owner-occupied 522 606 — 534 18 523 6  Residential mortgages:  Closed end 970 995 16 1,021 13 977 4  Revolving home equity 756 751 — 757 — 756 —  Consumer and other 333 333 — 266 12 336 6  $ 5,411 $ 5,515 $ 16 $ 5,460 $ 45 $ 5,424 $ 16        Nine Months Ended Three Months Ended  December 31, 2017 September 30, 2017 September 30, 2017  Unpaid Average Interest Average Interest  Recorded Principal Related Recorded Income Recorded Income  (in thousands) Investment Balance Allowance Investment Recognized Investment Recognized  With no related allowance recorded:  Commercial and industrial $ 48 $ 48 $ — $ 73 $ 4 $ 57 $ 2  Commercial mortgages - owner-occupied 531 615 — 545 16 536 5  Residential mortgages:  Closed end 1,095 1,102 — 346 — 505 —  Revolving home equity — — — 1,575 — 1,574 —  With an allowance recorded:  Commercial mortgages - owner-occupied — — — 7,079 — 6,977 —  Residential mortgages - closed end 273 272 18 384 14 377 5  Total:  Commercial and industrial 48 48 — 73 4 57 2  Commercial mortgages - owner-occupied 531 615 — 7,624 16 7,513 5  Residential mortgages:  Closed end 1,368 1,374 18 730 14 882 5  Revolving home equity — — — 1,575 — 1,574 —  $ 1,947 $ 2,037 $ 18 $ 10,002 $ 34 $ 10,026 $ 12  Aging of Loans . The following tables present the aging of the recorded investment in loans by class of loans.      September 30, 2018  Past Due Total Past  90 Days or Due Loans &  30-59 Days 60-89 Days More and Nonaccrual Nonaccrual Total  (in thousands) Past Due Past Due Still Accruing Loans Loans Current Loans  Commercial and industrial $ 195 $ — $ — $ 24 $ 219 $ 93,682 $ 93,901  Commercial mortgages:  Multifamily — — — — — 733,132 733,132  Other — — — 2,777 2,777 426,987 429,764  Owner-occupied — — — — — 96,390 96,390  Residential mortgages:  Closed end 37 624 — 625 1,286 1,786,859 1,788,145  Revolving home equity 251 22 — 756 1,029 73,050 74,079  Consumer and other 9 — — 9 5,875 5,884  $ 492 $ 646 $ — $ 4,182 $ 5,320 $ 3,215,975 $ 3,221,295   December 31, 2017  Commercial and industrial $ 20 $ — $ — $ — $ 20 $ 109,603 $ 109,623  Commercial mortgages:  Multifamily — — — — — 682,593 682,593  Other — — — — — 414,783 414,783  Owner-occupied — — — — — 95,631 95,631  Residential mortgages:  Closed end 2,186 21 — 1,000 3,207 1,555,357 1,558,564  Revolving home equity 522 — — — 522 83,103 83,625  Consumer and other 7 — — — 7 5,526 5,533  $ 2,735 $ 21 $ — $ 1,000 $ 3,756 $ 2,946,596 $ 2,950,352  There were no loans in the process of foreclosure nor did the Bank hold any foreclosed residential real estate property at September 30, 2018 or December 31, 2017. In 2017, the Bank took a deed-in-lieu of foreclosure for one commercial real estate property. The property was recorded as other real estate owned at December 31, 2017 and had a carrying value of $5,125,000 , which was net of a valuation allowance of $725,000 . Other real estate owned at December 31, 2017 consisted solely of th is property and was included in the consolidated balance sh eet under “O ther assets.” The Bank sold the property for its carrying value in the first quarter of 2018.  Troubled Debt Restructurings. A restructuring constitutes a troubled debt restructuring when it includes a concession by the Bank and the borrower is experiencing financial difficulty. 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 its debt in the foreseeable future without the modification. The Bank performs the evaluation under its internal underwriting policy.  During the nine months ended September 30, 2018, the Bank modified two consumer loans to a single borrower into one loan in a troubled debt restructuring amounting to $350,000 . The term of the restructured loan was extended for 12-months and the post-modification interest rate was lower than the current market rate for new debt with similar risk . The Bank did not modify any loans in troubled debt restructurings during the first nine months of 2017.  At September 30, 2018 and December 31, 2017 , the Bank had an allowance for loan losses of $16,000 and $18,000 , respectively, allocated to specific troubled debt restructurings. The Bank had no commitments to lend additional amounts in connection with loans that were classified a s troubled debt restructurings.  There were no troubled debt restructurings for which there was a payment default during the nine months ended September 30, 2018 and 2017 that were modified during the twelve-month period prior to default. A loan is considered to be in payment default once it is 90 days contractually past due under the modified terms.  Risk Characteristics . Credit risk within the Bank’s loan portfolio primarily stems from factors such as changes in the borrower ’ s financial condition, c redit concentration s , changes in collateral values , economic conditions and environmental contamination of properties securing mortgage loans. The Bank’s commercial loans, including those secured by real estate mortgages, are primarily made to small and medium-sized businesses. Such loans sometimes involve a higher degree of risk than those to larger companies because such businesses may have shorter operating histories, higher debt-to-equity ratios and may lack sophistication in internal record keeping and financial and operational controls. In addition, most of the Bank’s loans are made to businesses and consumers on Long Island and in the boroughs of New York City, and a large percentage of these loans are mortgage loans secured by properties located in those areas. The primary sources of repayment for residential and commercial mortgage loans include employment of the borrowers, the businesses of the borrowers and cash flows from the underlying properties. In t he case of multifamily mortgage loans , a substantial portion of the underlying properties are rent stabilized or rent controlled. These sources of repayment are dependent on, among other things, the strength of the local economy.  Credit Quality Indicators. The Corporation categorizes loans into risk categories based on relevant information about the borrower’s ability to service their debt including, but not limited to, current financial information for the borrower and any guarantors, payment experience, credit underwriting documentation, public records , due diligence checks and current economic trends.  Commercial and industrial loans and commercial mortgage loans are risk rated utilizing a ten point rating system. The ten point risk rating s ystem is described hereinafter.   Internally Assigned Risk Rating 1 – 2 Cash flow is of high quality and stable. Borrower has very good liquidity and ready access to traditional sources of credit. This category also includes loans to borrowers secured by cash and/or marketable securities within approved margin requirements. 3 – 4 Cash flow quality is strong, but shows some variability. Borrower has good liquidity and asset quality. Borrower has access to traditional sources of credit with minimal restrictions. 5 – 6 Cash flow quality is acceptable but shows some variability. Liquidity varies with operating cycle and assets provide an adequate margin of protection. Borrower has access to traditional sources of credit, but generally on a secured basis. 7 Watch - Cash flow has a high degree of variability and subject to economic downturns. Liquidity is strained and the ability of the borrower to access traditional sources of credit is diminished. 8 Special Mention - The borrower has potential weaknesses that deserve management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or in the Bank’s credit position at some future date. Special mention assets are not adversely classified and do not expose the Bank to risk sufficient to warrant adverse classification. 9 Substandard - Loans are inadequately protected by the current sound worth and paying capacity of the borrower or 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 the Bank will sustain some loss if the deficiencies are not corrected. 10 Doubtful - Loans have all the inherent weaknesses of those classified 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.  Risk ratings on commercial and industrial loans and commercial mortgages are initially assigned during the underwriting process and affirmed as part of the approval process . The ratings are periodically reviewed and evaluated based on borrower contact, credit department review or independent loan review.  The Bank's loan risk rating and review policy establishes requirements for the annual review of commercial real estate and commercial and industrial loans. The requirements include details of the scope of coverage and selection process based on loan-type and risk rating. Among other things, at least 80% of the recorded investment of commercial real estate loans as of December 31 of the prior year must be reviewed annually. Lines of credit are also reviewed annually at each proposed reaffirmation. The frequency of the review of other loans is determined by the Bank’s ongoing assessments of the borrower’s condition.  Residential mortgage loans, revolving home equity lines and other consumer loans are risk rated utilizing a three point rating system. In most cases, the borrower’s credit score dictates the risk rating. However, regardless of credit score, loans that are on management’s watch list or have been criticized or classified by management are assigned a risk rating of 3. A credit score is a tool used in the Bank’s loan approval process, and a minimum score of 680 is generally required for new loans. Credit scores for each borrower are updated at least annually. The risk ratings along with their definitions are as follows:   Internally Assigned Risk Rating 1 Credit score is equal to or greater than 680. 2 Credit score is 635 to 679. 3 Credit score is below 635 or, regardless of credit score, the loan has been classified, criticized or placed on watch by management .  The following tables present the recorded investment in commercial and industrial loans and commercial mortgage loans by class of loans and risk rating. Loans shown as Pass are all loans other than those risk rated Watch, Special Mention, Substandard or Doubtful.      September 30, 2018  Internally Assigned Risk Rating  Special  (in thousands) Pass Watch Mention Substandard Doubtful Total  Commercial and industrial $ 92,758 $ 450 $ 199 $ 494 $ — $ 93,901  Commercial mortgages:  Multifamily 730,699 — 2,433 — — 733,132  Other 411,407 — 15,580 2,777 — 429,764  Owner-occupied 91,802 — 4,043 545 — 96,390  $ 1,326,666 $ 450 $ 22,255 $ 3,816 $ — $ 1,353,187   December 31, 2017  Commercial and industrial $ 108,846 $ 450 $ 279 $ 48 $ — $ 109,623  Commercial mortgages:  Multifamily 673,128 2,354 7,111 — — 682,593  Other 404,379 7,567 2,837 — — 414,783  Owner-occupied 93,618 — 1,482 531 — 95,631  $ 1,279,971 $ 10,371 $ 11,709 $ 579 $ — $ 1,302,630  The following tables present the recorded investment in residential mortgage loans, home equity lines and other consumer loans by class of loans and risk rating. Loans shown as Pass are all loans other than those risk rated by management as Watch, Special Mention, Substandard or Doubtful.      September 30, 2018  Internally Assigned Risk Rating  Special  (in thousands) Pass Watch Mention Substandard Doubtful Total  Residential mortgages:  Closed end $ 1,786,334 $ 841 $ — $ 970 $ — $ 1,788,145  Revolving home equity 73,070 — 253 756 — 74,079  Consumer and other 5,369 — — 333 — 5,702  $ 1,864,773 $ 841 $ 253 $ 2,059 $ — $ 1,867,926   December 31, 2017  Residential mortgages:  Closed end $ 1,554,168 $ 2,200 $ 828 $ 1,368 $ — $ 1,558,564  Revolving home equity 82,665 256 704 — — 83,625  Consumer and other 5,236 — — — — 5,236  $ 1,642,069 $ 2,456 $ 1,532 $ 1,368 $ — $ 1,647,425  Deposit account overdrafts were $182,000 and $297,000 at September 30, 2018 and December 31, 2017 , respectively. Overdrafts are not assigned a risk rating and are therefore excluded from consumer loans in the tables above.

Stock-based Compensation

Stock-based Compensation	9 Months Ended
	Sep. 30, 2018
Stock-based Compensation [Abstract]
Stock-based Compensation	6 - STOCK-BASED COMPENSATION  On April 22, 2014, the stockholders of the Corporation approved the 2014 Equity Incentive Plan (“2014 Plan”). Upon approval of the 2014 Plan, no further awards could be made under the 2006 Stock Compensation Plan (“2006 Plan”).  2014 Plan. Under the 2014 Plan, awards may be granted to employees and non-employee directors as non-qualified stock options (“NQSOs”), stock appreciation rights (“SARs”), restricted stock awards, RSUs, or any combination thereof, any of which may be subject to performance-based vesting conditions. Awards may also be granted to employees as incentive stock options (“ISOs”). The exercise price of stock options and SARs granted under the 2014 Plan may not be less than the fair market value of the Corporation’s common stock on the date the stock option or SAR is granted. The 2014 Plan is administered by the Compensation Committee of the Board of Directors. Almost all of the awards granted to date under the 2014 Plan are RSUs. All awards granted under the 2014 Plan will immediately vest upon an involuntary termination following a change in control, total and permanent disability, as defined, or death, and with certain exceptions, will immediately vest in the event of retirement, as defined. The Corporation has 2,250,000 shares of common stock reserved for awards under the 2014 Plan. Awards granted under the 2006 Plan that expire or are forfeited after April 22, 2014 will be added to the number of shares of common stock reserved for issuance of awards under the 2014 Plan. All of the 2,250,000 shares may be issued upon the exercise of stock options or SARs. A maximum of 787,500 shares may be issued as restricted stock awards or upon the conversion of RSUs. At September 30, 2018 , 1,861,297 equity awards remain available to be granted under the 2014 Plan of which 405,653 may be granted as restricted stock awards or RSUs.  Details of RSUs. The following table summarizes the vesting schedule of RSUs outstanding at September 30, 2018 by the year they were originally granted.      Granted During the Year Ended December 31,  Total 2018 2017 2016 2015  Number of RSUs :  Granted 385,159 70,688 94,329 107,274 112,868  Outstanding at September 30, 2018 216,408 65,514 76,033 73,661 1,200   RSUs scheduled to vest during:  2018 81,672 14,357 — 66,115 1,200  2019 91,582 21,179 62,857 7,546 —  2020 18,707 8,781 9,926 — —  2021 24,447 21,197 3,250 — —  216,408 65,514 76,033 73,661 1,200  The RSUs in the table above include performance-based RSUs with vesting based on the financial performance of the Corporation in 2018 and 2019 and service-based RSUs with various service-based vesting periods. The grant date fair value of RSUs awarded in 2016 is equal to the market price of the shares underlying the awards on the grant date. RSUs awarded in 2016 accrue dividends at the same rate as dividends declared by the Board of Directors on the Corporation’s common stock. The grant date fair value of RSUs awarded in 2015, 2017 and 2018 is equal to the market price of the shares underlying the awards on the grant date, discounted for dividends that are not paid on these RSUs.  The following table presents a summary of RSUs outstanding at September 30, 2018 and changes during the nine month period then ended.      Weighted-  Weighted- Average Aggregate  Average Remaining Intrinsic  Number of Grant-Date Contractual Value  RSUs Fair Value Term (yrs.) (in thousands)  Outstanding at January 1, 2018 274,134 $ 19.64  Granted 70,688 27.10  Converted (106,522) 15.56  Forfeited (21,892) 22.83  Outstanding at September 30, 2018 216,408 $ 23.76 0.92 $ 4,707  Vested and Convertible at September 30, 2018 — $ — — $ —  The performance-based RSUs granted in 2018 and 2017 have a maximum payout potential of 1.50 and 1.25 shares of the Corporation’s common stock, respectively, for each RSU awarded. All other RSUs outstanding at September 30, 2018 have a maximum payout potential of one share of the Corporation’s common stock for each RSU awarded. All of the RSUs outstanding at September 30, 2018 are currently expected to vest and become convertible in the future. The total intrinsic value of RSUs converted during the first nine months of 2018 and 2017 was $3,011,000 and $1,779,000 , respectively.  2006 Plan. The 2006 Plan was approved by the stockholders of the Corporation on April 18, 2006. The 2006 Plan permitted the granting of stock options, SARs, restricted stock awards and RSUs to employees and non-employee directors. Under the terms of the 2006 Plan, stock options and SARs could not have an exercise price that was less than 100% of the fair market value of one share of the underlying common stock on the date of grant. Through December 31, 2011, equity grants to executive officers and directors under the 2006 Plan consisted of a combination of NQSOs and RSUs, while equity grants to other officers consisted solely of NQSOs. Beginning in 2012, equity grants under the 2006 Plan consisted solely of RSUs. Stock options granted under the 2006 Plan have a five year vesting period and a ten year term.  Fair Value of Stock Options. The grant date fair value of options was estimated on the date of grant using the Black-Scholes option pricing model. Substantially all outstanding stock options were expensed in prior years.  Stock Option Activity. The following table presents a summary of options outstanding at September 30, 2018 , and changes during the nine month period then ended.     Weighted-  Weighted- Average Aggregate  Average Remaining Intrinsic  Number of Exercise Contractual Value  Options Price Term (yrs.) (in thousands)  Outstanding at January 1, 2018 159,807 $ 11.35  Exercised (48,158) 10.79  Forfeited or expired — —  Outstanding at September 30, 2018 111,649 $ 11.59 1.50 $ 1,134  Exercisable at September 30, 2018 111,349 $ 11.57 1.49 $ 1,133  All options outstanding at September 30, 2018 are either fully vested or expected to vest. The total intrinsic value of options exercised during the first nine months of 2018 and 2017 was $734,000 and $1,062,000 , respectively.  Compensation Expense. The Corporation recorded compensation expense for share-based payments of $1,526,000 and $1,925,000 and reco rd ed related income tax benefits of $460,000 and $808,000 for the nine months ended September 30, 2018 and 2017 , respectively.  Unrecognized Compensation Cost. As of September 30, 2018, there was $1,298,000 of total unrecognized compensation cost related to non-vested equity awards comprised of $2,000 for stock options and $1,296,000 for RSUs. The total cost is expected to be recognized over a weighted-average period of 1.0 year, which is based on weighted-average periods of 1.7 years and 1.0 year for stock options and RSUs, respectively.  Cash Received and Tax Benefits Realized. Cash received from stock option exercises for the nine months ended September 30, 2018 and 2017 was $153,000 and $604,000 , respectively. Tax benefits from stock option exercises for the nine months ended September 30, 2018 and 2017 were $167,000 and $445,000 , respectively.  Other. No cash was used to settle stock options during the first nine months of 2018 or 2017 . The Corporation uses newly issued shares to settle stock option exercises and for the conversion of RSUs. During the nine months ended September 30, 2018 and 2017, 1,834 and 1,445 shares , respectively, of the Corporation’s common stock were issued to a member of the Board of Directors in payment of director fees.

Defined Benefit Pension Plan

Defined Benefit Pension Plan	9 Months Ended
	Sep. 30, 2018
Defined Benefit Pension Plan [Abstract]
Defined Benefit Pension Plan	7 - DEFINED BENEFIT PENSION PLAN  The following table sets forth the components of net periodic pension credit .      Nine Months Ended Three Months Ended  September 30, September 30,  (in thousands) 2018 2017 2018 2017  Service cost $ 1,027 $ 911 $ 342 $ 304  Interest cost 1,190 1,193 396 398  Expected return on plan assets (2,456) (2,205) (818) (735)  Amortization of net actuarial loss — 13 — 4  Net pension credit $ (239) $ (88) $ (80) $ (29)  As a result of the adoption of ASU 2017-07, for all periods presented, the components of net pension credit other than the service cost component were included in the line item “Other noninterest income” in the consolidated statements of income. The service cost component was included in the line item “Salaries” in the consolidated statements of income. See “Note 11 – Adoption of New Accounting Standards” for more information regarding the provisions of ASU 2017-07.  The Bank makes cash contributions to the pension plan (“Plan”) which comply with the fund ing requirements of applicable f ederal laws and regulations. For funding purposes, the laws and regulations set forth both minimum required and maximum tax-deductible contributions. The Bank has no minimum required pension contribution for the Plan year ending September 30, 2018 and it cannot make a tax-deductible contribution for the tax year beginning January 1, 201 8 .

Fair Value Of Financial Instrum

Fair Value Of Financial Instruments	9 Months Ended
	Sep. 30, 2018
Fair Value Of Financial Instruments [Abstract]
Fair Value Of Financial Instruments	8 - FAIR VALUE OF FINANCIAL INSTRUMENTS  Financial Instruments Recorded at Fair Value . When measuring fair value, the Corporation uses a fair value hierarchy, which is designed to maximize the use of observable inputs and minimize the use of unobservable inputs. The hierarchy involves three levels of inputs that may be used to measure fair value:  Level 1: Quoted prices (unadjusted) in active markets for identical assets or liabilities that the Corporation has the ability to access at the measurement date.  Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; or inputs other than quoted prices that are observable or can be corroborated by observable market data.  Level 3: Significant unobservable inputs that reflect the Corporation’s own assumptions about the assumptions that market participants would use in pricing an asset or liability.  The Corporation deems transfers between levels of the fair value hierarchy to have occurred on the date of the event or change in circumstance that caused the transfer. There were no transfers between levels of the fair value hierarchy during the nine months ended September 30, 2018 or 2017 .  The fair values of the Corporation’s financial assets and liabilities measured at fair value on a recurring basis at September 30, 2018 and December 31, 2017 are set forth in the tables that follow. These values are determined using matrix pricing (Level 2 inputs). Matrix pricing, which is a mathematical technique widely used in the industry to value debt securities, does not rely exclusively on quoted prices for the specific securities but rather on the relationship of such securities to other benchmark quoted securities.      Fair Value Measurements Using:  Quoted Prices Significant  in Active Other Significant  Markets for Observable Unobservable  Identical Assets Inputs Inputs  (in thousands) Total (Level 1) (Level 2) (Level 3)  September 30, 2018:  Financial Assets:  Available-for-Sale Securities:  State and municipals $ 423,792 $ — $ 423,792 $ —  Pass-through mortgage securities 72,434 — 72,434 —  Collateralized mortgage obligations 246,613 — 246,613 —  Corporate Bonds 60,000 — 60,000 —  $ 802,839 $ — $ 802,839 $ —   Derivative - interest rate swap $ 281 $ — $ 281 $ —   December 31, 2017:  Financial Assets:  Available-for-Sale Securities:  State and municipals $ 461,323 $ — $ 461,323 $ —  Pass-through mortgage securities 71,391 — 71,391 —  Collateralized mortgage obligations 187,414 — 187,414 —  $ 720,128 $ — $ 720,128 $ —   Assets measured at fair value on a nonrecurring basis at September 30, 2018 and December 31, 2017 , are set forth in the table that follows. Real estate appraisals utilized in measuring the fair value of impaired loans , if any, may employ a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are routinely made in the appraisal process by the independent appraisers to adjust for differences between the comparable sales and income data available. In arriving at fair value, the Corporation adjusts the value set forth in the appraisal by deducting costs to sell and a distressed sale adjustment when appropriate. The adjustments made by the appraisers and the Corporation are deemed to be significant unobservable inputs and therefore result in a Level 3 classification of the inputs used for determining the fair value of impaired loans.      Fair Value Measurements Using:  Quoted Prices Significant  in Active Other Significant  Markets for Observable Unobservable  Identical Assets Inputs Inputs  (in thousands) Total (Level 1) (Level 2) (Level 3)  September 30, 2018:  Residential mortgages held-for-sale:  Closed-end $ 509 $ — $ — $ 509  Revolving home equity 162 — — 162  $ 671 $ — $ — $ 671  December 31, 2017:  Other real estate owned $ 5,125 $ — $ — $ 5,125   The residential mortgage loans held-for-sale at September 30, 2018 in the preceding table were accounted for on a non-accrual basis and carried at the lower of cost or fair value.  The other real estate owned in the preceding table is one commercial real estate property acquired by deed-in-lieu of foreclosure . A valuation allowance of $725,000 was recorded and included in other noninterest expense in the consolidated statements of income for the year ended December 31, 2017. The Bank sold the property for its carrying value in the first quarter of 2018.  Other than the loans held-for-sale discussed above, t he Corporation had no impaired loans recorded at fair value at September 30, 2018 or December 31, 2017 . During the nine and three months ended September 30, 2017 , the Corporation recorded provision s (credits) for loan losses of $338,000 and ( $530,000 ), respectively, for impaired loans measured at fair value.  Financial Instruments Not Recorded at Fair Value. Fair value estimates are made at a specific point in time. Such estimates are generally subjective in nature and dependent upon a number of significant assumptions associated with each financial instrument or group of similar financial instruments, including estimates of discount rates, risks associated with specific financial instruments such as liquidity, credit and nonperformance risk , estimates of future cash flows, and relevant available market information. Changes in assumptions could significantly affect the estimates. In addition, fair value estimates do not reflect the value of anticipated future business, premiums or discounts that could result from offering for sale at one time the Corporation’s entire holdings of a particular financial instrument, or the income tax consequences of realizing gains or losses on the sale of financial instruments.  The following table sets forth the carrying amounts and estimated fair values of financial instruments that are not recorded at fair value in the Corporation’s financial statements.      Level of September 30, 2018 December 31, 2017  Fair Value Carrying Carrying  (in thousands) Hierarchy Amount Fair Value Amount Fair Value  Financial Assets:  Cash and cash equivalents Level 1 $ 50,462 $ 50,462 $ 69,672 $ 69,672  Held-to-maturity securities Level 2 3,682 3,739 5,030 5,143  Held-to-maturity securities Level 3 3,163 3,163 2,606 2,606  Loans Level 3 3,187,744 2,998,186 2,916,568 2,855,812  Restricted stock Level 1 37,941 37,941 37,314 37,314   Financial Liabilities:  Checking deposits Level 1 946,236 946,236 896,129 896,129  Savings, NOW and money market deposits Level 1 1,679,617 1,679,617 1,602,460 1,602,460  Time deposits Level 2 534,656 528,725 323,408 323,108  Short-term borrowings Level 1 292,176 292,176 281,141 281,141  Long-term debt Level 2 403,027 392,865 423,797 418,465   As described in “Note 11 – Adoption of New Accounting Standards,” t he Corporation adopted ASU 2016-01 on January 1, 2018 and applied the provisions of the standard prospectively to the fair value amounts in the table above. 

Revenue From Contracts With Cus

Revenue From Contracts With Customers	9 Months Ended
	Sep. 30, 2018
Revenue From Contracts With Customers [Abstract]
Revenue From Contracts With Customers	9 – REVENUE FROM CONTRACTS WITH CUSTOMERS  As described in “Note 11 – Adoption of New Accounting Standards,” the Corporation adopted ASU 2014-09 “Revenue from Contracts with Customers” and all subsequent amendments on January 1, 2018. The majority of the Bank's income streams are outside of the scope of ASU 2014-09, such as interest and dividend income on loans and securities. Income streams that are within the scope of ASU 2014-09 are recorded in the noninterest income section of the co nsolidated statements of income and include the f ollowing types of fees earned from the Bank's contracts with customers.  Investment Management Division Revenues. The Bank holds customer assets in a fiduciary capacity and provides various services, including trust account services, estate settlement, custody and asset management. The services are performed for customer s over time, requiring a time-based measure of progress. Fees are assessed based on market valu es of customer assets held or under management as of a certain point in time, and income cannot be estimated prior to the end of the measurement period. Volatility in equity and other market values will impact the amount of revenue that will be earned. Fees are generally earned and collected on a monthly or quarterly basis, accrued to income as earned and included in the consolidated statements of income in the line item "Investment Management Division income."  Deposit Account Revenues. Fees are earned and collected on a monthl y basis for account maintenance and activity -based service charges o n deposit accounts. The services are performed for customer s over time, requiring a time-based measure of progress. Customers may be required to maintain minimum balances and average balances. Additional fees may also be earned for overdrafts, replacement of debit cards, bill payment, lockbox services and ACH services, among others, and are earned and collected as transactions take place. All deposit account fees are accrued to income as earned, either monthly or at the point of sale , and included in the consolidated statements of income in the line item "Service charges on deposit accounts."  Transaction and Branch Service Fees. The following revenue streams are components of “Other noninterest income” on the consolidated statements of income. These components totaled $1,567,000 and $1,426,000 for the nine months ended September 30, 2018 and 2017, respectively. Other items included in “Other noninterest income,” such as bank-owned life insurance (“BOLI”) income, non-service components of net pension cost and real estate tax refunds are outside of the scope of ASU 2014-09.  Debit/Credit Card Revenue s . The Bank earns a fee when its customers use their debit or credit cards in point-of-sale transactions. These fees are generally known as interchange fees. Interchange fees from cardholder transactions represent a percentage of the underlying transaction value and are recorded daily, concurrently with the transaction processing services provided to the cardholder.  Branch Service s Revenues. The Bank charges fees for safe deposit box rentals, wire transfers, money orders, checkbook printing, official checks an d ATM usage. Fees are earned, collected and generally recorded as revenue when the service is provided.  Investment Advisory Services. The Bank provides branch space to a third party who sells financial products to the Bank’s customers and pays commissions to the Bank based on the products sold. Commissions are variable and based on the market values of financial assets sold. C ommissions are accrued to incom e as earned and collected. 

Derivatives

Derivatives	9 Months Ended
	Sep. 30, 2018
Derivatives [Abstract]
Derivatives	10 – DERIVATIVES  As part of its asset liability management activities , the Co rporation may utilize interest rate swap s to help manage its interest rate risk posi tion. The notional amount of an interest rate swap does not represent the amount exchanged by the parties. The exchange of cash flows is determined by reference to the notional amount and the other terms of the interest rate swap agreement s.  The Bank entered into an interest rate swap with a notional amount totaling $150 million on May 22, 2018, which was designated as a cash flow hedge of certain Federal Home Loan Bank (“ FHLB ”) advances included in short-term borrowings on the consolidated balance sheet. The swap w as determined to be fully effective during the period s presented and therefore no amount of ineffectiveness has been included in net income. The aggregate fa ir value of the swap is recorded in other asset s, with changes in fair value net of related income taxes recorded in other comprehensive income (loss). The amount included in accumulated other comprehensive income (loss) would be reclassified to current earnings should the hedge no longer be considered effective. The Corporation expects the hedge to remain fully effective during the remaining term of the swap .  The following table summarizes informati on about the interest rate swap designated as a c ash flow hedge at September 30, 2018.      Notional amount $150 million  Weighted average fixed pay rate 2.90%  Weighted average 3-month LIBOR receive rate Currently 2.32%  Weighted average maturity 2.68 Years  Interest expense recorded on the swap transaction , which totaled $315,000 and $225,000 , respectively, for the nine and three months ended September 30, 2018 , is includ ed in the line item “I nterest expense – short-term borrowings” in the consolidated statements of income . Amounts reported in accumulated other comprehensive income related to the swap will be reclassified to interest expense as interest payments are received /made on the Bank ’s variable-rate assets/liabilities. During the nine months ended September 30, 2018, the Co rporation had $315,000 of reclassifications to interest expense. During the next twelve months, the Co rporation estimates that $243,000 will be reclassified as a n in crease to interest expense.  The following table presents the net gains ( losses ) recorded in the consolidated statements of i ncome and the consolidated statements of c omprehensive income relating to the interest rate swap for the nine and three months ended September 30, 2018.      Amount of Amount of Loss  Gain/(Loss) Amount of Loss Recognized in Other  Recognized in OCI Reclassified from OCI Noninterest Income  (in thousands) (Effective Portion) to Interest Expense (Ineffective Portion)  Interest rate contract:  Nine months ended September 30, 2018 $ (34) $ 315 $ —  Three months ended September 30, 2018 $ 462 $ 225 $ —  The following table reflects the amounts relating to the interest rate swap included in the consolidated balance sheet at September 30, 2018.     Notional Fair Value  (in thousands) Amount Asset Liability  Included in other assets or other liabilities $ 281 $ —  Interest rate swap related to FHLB advances $ 150,000  Credit Risk Related Contingent Features . The Bank’s agreement with its interest rate swap counterparty s ets forth minimum collateral posting thresholds . If the termination value of the swap is a net asset position, the counterparty may be required to post collateral against its obligations to the Bank under the agreement. However, if the termination value of the swap is a net liability position, the Bank may be required to post collateral to the counterparty. At September 30, 2018, the termination value of the Bank’s swap is in an asset position of $281,000 . If the Bank had breached any of these provisions at September 30, 2018, it could have been required to settle its obligations under the agreement at the termination value. 

Adoption Of New Accounting Stan

Adoption Of New Accounting Standards	9 Months Ended
	Sep. 30, 2018
Basis Of Presentation [Abstract]
Adoption of New Accounting Standards	11 – ADOPTION OF NEW ACCOUNTING STANDARDS  In May 2014, the Financial Accounting Standards Board (“FASB”) issued ASU 2014-09 “Revenue from Contracts with Customers.” The amendments in ASU 2014-09 provide a comprehensive framework for addressing revenue recognition issues that can be applied to all contracts with customers. While the guidance in ASU 2014-09 supersedes most existing industry-specific revenue recognition accounting guidance, much of a bank’s revenue comes from financial instruments such as debt securities and loans that are scoped-out of the guidance. The amendments in ASU 2014-09 also include improved disclosures to enable users of financial statements to better understand the nature, amount, timing and uncertainty of revenue that is recognized. For public entities such as the Corporation, ASU 2014-09, as amended, is effective for interim and annual reporting periods beginning after December 15, 2017. The adoption of ASU 2014-09 and all subsequent amendments on January 1, 2018, using the modified retrospective transition method, did not impact the Corporation’s financial position or results of operations and, as such, no cumulative effect adjustment was recorded. See “Note 9 – Revenue from Contracts with Customers” for disclosures pertaining to the revenue streams within the scope of ASU 2014-09.  In January 2016, the FASB issued ASU 2016-01 “Financial Instruments – Overall.” The amendments in ASU 2016-01 are intended to improve the recognition, measurement, presentation and disclosure of financial assets and liabilities to provide users of financial statements with information that is more useful for decision-making purposes. For public entities such as the Corporation, the amendments in ASU 2016-01 are effective for interim and annual reporting periods beginning after December 15, 2017. The adoption of ASU 2016-01 on January 1, 2018 did not have an impact on the Corporation’s financial position or results of operations, but resulted in the prospective application of an exit price notion in the determination of the fair value of certain financial instruments as disclosed in “Note 8 – Fair Value of Financial Instruments.” Adoption of the ASU also resulted in the elimination of disclosures regarding the methods and assumptions used to estimate fair value. The Bank’s FHLB and Federal Reserve Bank (“FRB”) stock, included under the line item “Restricted stock, at cost” in the consolidated balance sheets, are specifically excluded from the scope of the ASU.  In August 2016, the FASB issued ASU 2016-15 “Classification of Certain Cash Receipts and Cash Payments.” ASU 2016-15 affects all entities that are required to present a statement of cash flows under Accounting Standards Codification (“ASC”) Topic 230, Statement of Cash Flows, and other ASC Topics, addressing eight specific cash flow issues with the objective of reducing diversity in practice. ASU 2016-15 is effective for interim and annual reporting periods beginning after December 15, 2017. The adoption of ASU 2016-15 on January 1, 2018 did not have a material impact on the Corporation’s cash flows or disclosures.  In March 2017, the FASB issued ASU 2017-07 “Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost.” ASU 2017-07 applies to all employers that offer to their employees defined benefit pension plans, other postretirement benefit plans or other types of benefits accounted for under ASC Topic 715. The ASU requires, among other things, that an employer disaggregate the service cost component from other components of net benefit cost and provides explicit guidance on how to present the service cost component and other components of net benefit cost in the income statement. ASU 2017-07 is effective for interim and annual reporting periods beginning after December 15, 2017. The adoption of ASU 2017-07 on January 1, 2018 resulted in revised income statement classifications of the components of net periodic pension cost for all periods presented. T he Corporation used the amounts disclosed in “Note 7 – Defined Benefit Pension Plan” as the basis for applying the retrospective presentation requirements of the ASU. See Note 7 for details of the reclassified amounts. The other amendments in the ASU did not impact the Corporation’s financial position or results of operations.  In February 2018, the FASB issued ASU 2018-02 “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” ASU 2018-02 affects any entity that has items of other comprehensive income for which the related tax effects are presented in other comprehensive income. The ASU allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Act which was signed into law on December 22, 2017. ASU 2018-02 is effective for all entities for fiscal years beginning after December 15, 2018. Early adoption is permitted, including adoption in any interim period. Management early-adopted the ASU in the first quarter of 2018 and reclassified $277,000 of stranded tax effect credits from accumulated other comprehensive income to retained earnings on January 1, 2018. The reclassification had no net impact on the Corporation’s financial position or results of operations. 

Impact Of Issued But Not Yet Ef

Impact Of Issued But Not Yet Effective Accounting Standards	9 Months Ended
	Sep. 30, 2018
Impact Of Issued But Not Yet Effective Accounting Standards [Abstract]
Impact Of Issued But Not Yet Effective Accounting Standards	1 2 – IMPACT OF IS SUED BUT NOT YET EFFECTIVE ACCOUNTING STANDARDS  The pronouncements discussed in this section are not inten ded to be an all-inclusive list, but rather only those pronouncements that could potentially have an impact on the Corporation’s financial position, results of operations or disclosures .  In February 2016, the FASB issued ASU 2016-02 “Leases.” ASU 2016-02 affects any entity that enters into a lease and is intended to increase the transparency and comparability of financial statements among organizations. The ASU requires, among other changes, a lessee to recognize on its balance sheet a lease asset and a lease liability for those leases previously classified as operating leases. The lease asset would represent the right to use the underlying asset for the lease term and the lease liability would represent the discounted value of the required lease payments to the lessor. The ASU would also require entities to disclose key information about leasing arrangements. ASU 2016-02 , as amended, is effective for interim and annual reporting periods beginning after December 15, 2018. Based on the lease arrangements in effect at September 30, 2018 and the work completed to date in implementing the ASU, management believes that the ASU will not have a material impact on the Corporation’s financial position, results of operations or regulatory capital ratios. The Corporation expects to utilize the transition method described in ASU 2018-11 “Leases – Targeted Improvements” with an application date of January 1, 2019 to implement the ASU .  In June 2016, the FASB issued ASU 2016-13 “Measurement of Credit Los ses on Financial Instruments.” ASU 2016-13 affects entities holding financial assets that are not accounted for at fair value , i ncluding loans, debt securities and other financial assets. The ASU requires financial assets measured at amortized cost to be presented at the net amount expected to be collected by recording an allowance for credit losses. ASU 2016-13 is effective for interim and annual reporting periods beginning after December 15, 2019. Early adoption is permitted beginning after December 15, 2018, including interim periods within those fiscal years. Management has established an internal committee to manage the implementation of the ASU. The committee is led by the Bank’s Chief Accounting Officer and includes the Chief Financial Officer and Chief Risk Officer. A broader group of Bank staff has been identifi ed to assist in implementing the ASU including representatives of the Bank’s loan operations, credit administration, lending, investments and technology functions. The committee has selected and engaged a third-party software provider, developed an implementation timeline, accumulated the historical data needed to implement the ASU and is in the process of evaluating the accuracy and completeness of this data. In addition, the committee continues to analyze the ASU to understand the impact that it will have on the Corporation’s financial position, results of operations and disclosures.  In August 2018, the FASB issued ASU 2018-13 “Changes to the Disclosure Requirements for Fair Value Measurement” and ASU 2018-14 “Changes to the Disclosure Requirements for Defined Benefit Plans.” These ASUs modify certain disclosure requirements pertaining to fair value measurements and defined benefit plans, respectively, as part of the FASB’s disclosure framework project intended to improve the effectiveness of disclosures in the notes to financial statements. ASU 2018-13 is effective for fiscal years and interim periods within those fiscal years beginning after December 15, 2019. ASU 2018-14 is effective for fiscal years ending after December 15, 2020. Early adoption is permitted. The adoption of these ASUs will modify the Corporation’s disclosures but will not impact its financial position or results of operations.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	13 – SUBSEQUENT EVENTS  During October 2018, the Bank made a decision to restructure the securities portfolio by selling $61.6 million of mortgage-backed securities that were classified as available-for-sale. The securities sold had a yield of 2.51% and resulted in a pre-tax loss of approximately $3.2 million . The proceeds from the sale were used to pay down overnight borrowings with a cost of 2.47% .  Also during October 2018, the Bank completed a sale of the land and building related to one of its branches which was previously included in “other assets” in the consolidated balance sheets and carried at the lower of cost or fair value at September 30, 2018. The sale resulted in a pre-tax gain of $1.2 million in the fourth quarter of 2018. 

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2018
Earnings Per Share [Abstract]
Calculation Of Earnings Per Share	   Nine Months Ended Three Months Ended  September 30, September 30,  (dollars in thousands, except per share data) 2018 2017 2018 2017  Net income $ 31,483 $ 27,556 $ 10,057 $ 9,342  Income allocated to participating securities (1) 86 101 26 34  Income allocated to common stockholders $ 31,397 $ 27,455 $ 10,031 $ 9,308   Weighted average:  Common shares 25,236,889 24,096,079 25,409,087 24,332,939  Dilutive stock options and restricted stock units (1) 174,095 253,715 144,933 247,127  25,410,984 24,349,794 25,554,020 24,580,066  Earnings per share:  Basic $1.24 $1.14 $.39 $.38  Diluted 1.24 1.13 .39 .38  (1) Restricted stock units (“RSUs”) awarded in 2016 accrue dividends at the same rate as the dividends declared by the Board of Directors on the Corporation’s common stock. For purposes of computing EPS, these RSUs are considered to participate with common stock in the earnings of the Corporation and, therefore, the Corporation calculates basic and diluted EPS using the two-class method. Under the two-class method, net income for the period is allocated between common stockholders and participating securities according to dividends declared and participation rights in undistributed earnings. As a result, the RSUs awarded in 2016 are not included in the weighted average “dilutive stock options and restricted stock units” in the table above.

Comprehensive Income (Tables)

Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2018
Comprehensive Income [Abstract]
Components Of Other Comprehensive Income And Related Tax Effects	   Nine Months Ended Three Months Ended  September 30, September 30,  (in thousands) 2018 2017 2018 2017  Change in net unrealized holding gains (losses) on  available-for-sale securities:  Change arising during the period $ (22,059) $ 4,847 $ (7,231) $ (561)  Reclassification adjustment for net (gains) losses  included in net income (1) 4,960 (73) 4,960 (16)  (17,099) 4,774 (2,271) (577)  Tax effect (5,166) 2,004 (686) (242)  (11,933) 2,770 (1,585) (335)  Change in funded status of pension plan:  Amortization of net actuarial loss included in net income (2) — 13 — 4  Tax effect — 6 — 2  — 7 — 2  Change in unrealized gain on derivative instrument:  Amount of gain (loss) recognized during the period (34) — 462 —  Reclassification adjustment for net interest expense  included in net income (3) 315 — 225 —  281 — 687 —  Tax effect 85 — 207 —  196 — 480 —   Other comprehensive income (loss) $ (11,737) $ 2,777 $ (1,105) $ (333)  (1) Represents net realized gains or losses arising from the sale of available-for-sale securities. The net realized gains or losses are included in the consolidated statements of income in the line item, “Net gains (losses) on sales of securities.” See “Note 4 – Investment Securities” for the income tax expense or benefit related to the net realized gains or losses , which is included in the consolidated statements of income in the line item, “Income tax expense.”  (2) Represents the amortization of net actuarial loss relating to the Corporation’s defined benefit pension plan. This item is a component of net periodic pension cost (see “Note 7 – Defined Benefit Pension Plan”) .  (3) Represents the net interest expense recorded on a derivative transaction and included in the consolidated statements of income in the line item “Interest expense – short-term borrowings.”
Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax	     Current Period Change due to  Other Adoption  Balance Comprehensive of ASU Balance  (in thousands) 12/31/17 Income (Loss) 2018-02 (1) 9/30/18  Unrealized holding gains (losses) on available-for-sale securities $ 2,600 $ (11,933) $ 361 $ (8,972)  Unrealized actuarial losses on pension plan (2,054) — (638) (2,692)  Unrealized gain on derivative instrument — 196 — 196  Accumulated other comprehensive income (loss), net of tax $ 546 $ (11,737) $ (277) $ (11,468)  (1) The adoption of Accounting Standards Update (“ASU”) 2018-02 “Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income” in the first quarter of 2018 allowed the Corporation to reclassify certain stranded tax effects arising from the enactment of the Tax Cuts and Jobs Act (“Tax Act”) in December 2017 from accumulated other comprehensive income to retained earnings. See “Note 11 – Adoption of New Accounting Standards” for more information regarding the effects of adopting ASU 2018-02.

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2018
Investment Securities [Abstract]
Amortization Cost And Estimated Fair Value Of Investment Securities	   September 30, 2018  Gross Gross  Amortized Unrealized Unrealized Fair  (in thousands) Cost Gains Losses Value  Held-to-Maturity Securities:  State and municipals $ 6,412 $ 42 $ — $ 6,454  Pass-through mortgage securities 274 12 — 286  Collateralized mortgage obligations 159 3 — 162  $ 6,845 $ 57 $ — $ 6,902  Available-for-Sale Securities:  State and municipals $ 428,977 $ 2,966 $ (8,151) $ 423,792  Pass-through mortgage securities 74,576 4 (2,146) 72,434  Collateralized mortgage obligations 252,129 — (5,516) 246,613  Corporate bonds 60,000 — — 60,000  $ 815,682 $ 2,970 $ (15,813) $ 802,839   December 31, 2017  Held-to-Maturity Securities:  State and municipals $ 6,970 $ 78 $ — $ 7,048  Pass-through mortgage securities 311 21 — 332  Collateralized mortgage obligations 355 14 — 369  $ 7,636 $ 113 $ — $ 7,749  Available-for-Sale Securities:  State and municipals $ 453,158 $ 10,051 $ (1,886) $ 461,323  Pass-through mortgage securities 72,539 84 (1,232) 71,391  Collateralized mortgage obligations 190,175 15 (2,776) 187,414  $ 715,872 $ 10,150 $ (5,894) $ 720,128 
Securities With A Continuous Unrealized Losses Position	   September 30, 2018  Less than 12 Months  12 Months or More Total  Fair Unrealized Fair Unrealized Fair Unrealized  (in thousands) Value Loss Value Loss Value Loss  State and municipals $ 175,087 $ (4,533) $ 34,708 $ (3,618) $ 209,795 $ (8,151)  Pass-through mortgage securities 51,251 (886) 19,965 (1,260) 71,216 (2,146)  Collateralized mortgage obligations 187,737 (3,844) 28,351 (1,672) 216,088 (5,516)  Total temporarily impaired $ 414,075 $ (9,263) $ 83,024 $ (6,550) $ 497,099 $ (15,813)   December 31, 2017  State and municipals $ 54,732 $ (574) $ 28,723 $ (1,312) $ 83,455 $ (1,886)  Pass-through mortgage securities 10,172 (81) 52,652 (1,151) 62,824 (1,232)  Collateralized mortgage obligations 130,267 (1,230) 54,751 (1,546) 185,018 (2,776)  Total temporarily impaired $ 195,171 $ (1,885) $ 136,126 $ (4,009) $ 331,297 $ (5,894) 
Sales Of Available-For-Sale Securities	   Nine Months Ended Three Months Ended  (in thousands) September 30, September 30,  2018 2017 2018 2017   Proceeds $ 169,631 $ 49,077 $ 169,631 $ 9,066   Gross gains $ 300 $ 382 $ 300 $ 16  Gross losses (5,260) (309) (5,260) —  Net gain (loss) $ (4,960) $ 73 $ (4,960) $ 16 
Maturities	   (in thousands) Amortized Cost Fair Value  Held-to-Maturity Securities:  Within one year $ 4,335 $ 4,339  After 1 through 5 years 2,077 2,115  After 5 through 10 years — —  After 10 years — —  Mortgage-backed securities 433 448  $ 6,845 $ 6,902  Available-for-Sale Securities:  Within one year $ 46,642 $ 47,179  After 1 through 5 years 37,623 37,733  After 5 through 10 years 227,010 225,866  After 10 years 177,702 173,014  Mortgage-backed securities 326,705 319,047  $ 815,682 $ 802,839 

Loans (Tables)

Loans (Tables)	9 Months Ended
	Sep. 30, 2018
Loans [Abstract]
Loans Individually And Collectively Evaluated For Impairment	   September 30, 2018  Loans Allowance for Loan Losses  (in thousands) Individually Evaluated for Impairment Collectively Evaluated for Impairment Ending Balance Individually Evaluated for Impairment Collectively Evaluated for Impairment Ending Balance  Commercial and industrial $ 53 $ 93,848 $ 93,901 $ — $ 1,152 $ 1,152  Commercial mortgages:  Multifamily — 733,132 733,132 — 6,497 6,497  Other 2,777 426,987 429,764 — 4,196 4,196  Owner-occupied 522 95,868 96,390 — 826 826  Residential mortgages:  Closed end 970 1,787,175 1,788,145 16 20,295 20,311  Revolving home equity 756 73,323 74,079 — 507 507  Consumer and other 333 5,551 5,884 — 62 62  $ 5,411 $ 3,215,884 $ 3,221,295 $ 16 $ 33,535 $ 33,551   December 31, 2017  Commercial and industrial $ 48 $ 109,575 $ 109,623 $ — $ 1,441 $ 1,441  Commercial mortgages:  Multifamily — 682,593 682,593 — 6,423 6,423  Other — 414,783 414,783 — 4,734 4,734  Owner-occupied 531 95,100 95,631 — 1,076 1,076  Residential mortgages:  Closed end 1,368 1,557,196 1,558,564 18 19,329 19,347  Revolving home equity — 83,625 83,625 — 689 689  Consumer and other — 5,533 5,533 — 74 74  $ 1,947 $ 2,948,405 $ 2,950,352 $ 18 $ 33,766 $ 33,784 
Allowance For Loan Losses	   (in thousands) Balance at 1/1/18 Chargeoffs Recoveries Provision for Loan Losses (Credit) Balance at 9/30/18  Commercial and industrial $ 1,441 $ 482 $ 6 $ 187 $ 1,152  Commercial mortgages:  Multifamily 6,423 — — 74 6,497  Other 4,734 — — (538) 4,196  Owner-occupied 1,076 — — (250) 826  Residential mortgages:  Closed end 19,347 413 101 1,276 20,311  Revolving home equity 689 138 150 (194) 507  Consumer and other 74 4 — (8) 62  $ 33,784 $ 1,037 $ 257 $ 547 $ 33,551   Balance at 7/1/18 Chargeoffs Recoveries Provision for Loan Losses (Credit) Balance at 9/30/18  Commercial and industrial $ 1,298 $ 178 $ — $ 32 $ 1,152  Commercial mortgages:  Multifamily 7,048 — — (551) 6,497  Other 4,768 — — (572) 4,196  Owner-occupied 911 — — (85) 826  Residential mortgages:  Closed end 20,953 393 1 (250) 20,311  Revolving home equity 775 89 150 (329) 507  Consumer and other 79 4 — (13) 62  $ 35,832 $ 664 $ 151 $ (1,768) $ 33,551      (in thousands) Balance at 1/1/17 Chargeoffs Recoveries Provision for Loan Losses (Credit) Balance at 9/30/17  Commercial and industrial $ 1,408 $ 102 $ 10 $ 341 $ 1,657  Commercial mortgages:  Multifamily 6,119 — — (221) 5,898  Other 4,296 — — 451 4,747  Owner-occupied 959 — — 616 1,575  Residential mortgages:  Closed end 15,740 — 3 2,362 18,105  Revolving home equity 1,401 — — (311) 1,090  Consumer and other 134 27 2 (35) 74  $ 30,057 $ 129 $ 15 $ 3,203 $ 33,146   Balance at 7/1/17 Chargeoffs Recoveries Provision for Loan Losses (Credit) Balance at 9/30/17  Commercial and industrial $ 1,544 $ 96 $ 3 $ 206 $ 1,657  Commercial mortgages:  Multifamily 5,921 — — (23) 5,898  Other 4,674 — — 73 4,747  Owner-occupied 1,685 — — (110) 1,575  Residential mortgages:  Closed end 17,035 — 1 1,069 18,105  Revolving home equity 1,203 — — (113) 1,090  Consumer and other 74 21 1 20 74  $ 32,136 $ 117 $ 5 $ 1,122 $ 33,146 
Impaired Loans	     Nine Months Ended Three Months Ended  December 31, 2017 September 30, 2017 September 30, 2017  Unpaid Average Interest Average Interest  Recorded Principal Related Recorded Income Recorded Income  (in thousands) Investment Balance Allowance Investment Recognized Investment Recognized  With no related allowance recorded:  Commercial and industrial $ 48 $ 48 $ — $ 73 $ 4 $ 57 $ 2  Commercial mortgages - owner-occupied 531 615 — 545 16 536 5  Residential mortgages:  Closed end 1,095 1,102 — 346 — 505 —  Revolving home equity — — — 1,575 — 1,574 —  With an allowance recorded:  Commercial mortgages - owner-occupied — — — 7,079 — 6,977 —  Residential mortgages - closed end 273 272 18 384 14 377 5  Total:  Commercial and industrial 48 48 — 73 4 57 2  Commercial mortgages - owner-occupied 531 615 — 7,624 16 7,513 5  Residential mortgages:  Closed end 1,368 1,374 18 730 14 882 5  Revolving home equity — — — 1,575 — 1,574 —  $ 1,947 $ 2,037 $ 18 $ 10,002 $ 34 $ 10,026 $ 12 
Aging Of The Recorded Investment In Loans	   September 30, 2018  Past Due Total Past  90 Days or Due Loans &  30-59 Days 60-89 Days More and Nonaccrual Nonaccrual Total  (in thousands) Past Due Past Due Still Accruing Loans Loans Current Loans  Commercial and industrial $ 195 $ — $ — $ 24 $ 219 $ 93,682 $ 93,901  Commercial mortgages:  Multifamily — — — — — 733,132 733,132  Other — — — 2,777 2,777 426,987 429,764  Owner-occupied — — — — — 96,390 96,390  Residential mortgages:  Closed end 37 624 — 625 1,286 1,786,859 1,788,145  Revolving home equity 251 22 — 756 1,029 73,050 74,079  Consumer and other 9 — — 9 5,875 5,884  $ 492 $ 646 $ — $ 4,182 $ 5,320 $ 3,215,975 $ 3,221,295   December 31, 2017  Commercial and industrial $ 20 $ — $ — $ — $ 20 $ 109,603 $ 109,623  Commercial mortgages:  Multifamily — — — — — 682,593 682,593  Other — — — — — 414,783 414,783  Owner-occupied — — — — — 95,631 95,631  Residential mortgages:  Closed end 2,186 21 — 1,000 3,207 1,555,357 1,558,564  Revolving home equity 522 — — — 522 83,103 83,625  Consumer and other 7 — — — 7 5,526 5,533  $ 2,735 $ 21 $ — $ 1,000 $ 3,756 $ 2,946,596 $ 2,950,352 
Risk Ratings	The following tables present the recorded investment in commercial and industrial loans and commercial mortgage loans by class of loans and risk rating. Loans shown as Pass are all loans other than those risk rated Watch, Special Mention, Substandard or Doubtful.      September 30, 2018  Internally Assigned Risk Rating  Special  (in thousands) Pass Watch Mention Substandard Doubtful Total  Commercial and industrial $ 92,758 $ 450 $ 199 $ 494 $ — $ 93,901  Commercial mortgages:  Multifamily 730,699 — 2,433 — — 733,132  Other 411,407 — 15,580 2,777 — 429,764  Owner-occupied 91,802 — 4,043 545 — 96,390  $ 1,326,666 $ 450 $ 22,255 $ 3,816 $ — $ 1,353,187   December 31, 2017  Commercial and industrial $ 108,846 $ 450 $ 279 $ 48 $ — $ 109,623  Commercial mortgages:  Multifamily 673,128 2,354 7,111 — — 682,593  Other 404,379 7,567 2,837 — — 414,783  Owner-occupied 93,618 — 1,482 531 — 95,631  $ 1,279,971 $ 10,371 $ 11,709 $ 579 $ — $ 1,302,630  The following tables present the recorded investment in residential mortgage loans, home equity lines and other consumer loans by class of loans and risk rating. Loans shown as Pass are all loans other than those risk rated by management as Watch, Special Mention, Substandard or Doubtful.      September 30, 2018  Internally Assigned Risk Rating  Special  (in thousands) Pass Watch Mention Substandard Doubtful Total  Residential mortgages:  Closed end $ 1,786,334 $ 841 $ — $ 970 $ — $ 1,788,145  Revolving home equity 73,070 — 253 756 — 74,079  Consumer and other 5,369 — — 333 — 5,702  $ 1,864,773 $ 841 $ 253 $ 2,059 $ — $ 1,867,926   December 31, 2017  Residential mortgages:  Closed end $ 1,554,168 $ 2,200 $ 828 $ 1,368 $ — $ 1,558,564  Revolving home equity 82,665 256 704 — — 83,625  Consumer and other 5,236 — — — — 5,236  $ 1,642,069 $ 2,456 $ 1,532 $ 1,368 $ — $ 1,647,425 

Stock-based Compensation (Table

Stock-based Compensation (Tables)	9 Months Ended
	Sep. 30, 2018
Stock-based Compensation [Abstract]
Summary Of RSU Vested And Expected To Vest	   Granted During the Year Ended December 31,  Total 2018 2017 2016 2015  Number of RSUs :  Granted 385,159 70,688 94,329 107,274 112,868  Outstanding at September 30, 2018 216,408 65,514 76,033 73,661 1,200   RSUs scheduled to vest during:  2018 81,672 14,357 — 66,115 1,200  2019 91,582 21,179 62,857 7,546 —  2020 18,707 8,781 9,926 — —  2021 24,447 21,197 3,250 — —  216,408 65,514 76,033 73,661 1,200 
RSU Activity	   Weighted-  Weighted- Average Aggregate  Average Remaining Intrinsic  Number of Grant-Date Contractual Value  RSUs Fair Value Term (yrs.) (in thousands)  Outstanding at January 1, 2018 274,134 $ 19.64  Granted 70,688 27.10  Converted (106,522) 15.56  Forfeited (21,892) 22.83  Outstanding at September 30, 2018 216,408 $ 23.76 0.92 $ 4,707  Vested and Convertible at September 30, 2018 — $ — — $ — 
Stock Option Activity	   Weighted-  Weighted- Average Aggregate  Average Remaining Intrinsic  Number of Exercise Contractual Value  Options Price Term (yrs.) (in thousands)  Outstanding at January 1, 2018 159,807 $ 11.35  Exercised (48,158) 10.79  Forfeited or expired — —  Outstanding at September 30, 2018 111,649 $ 11.59 1.50 $ 1,134  Exercisable at September 30, 2018 111,349 $ 11.57 1.49 $ 1,133 

Defined Benefit Pension Plan (T

Defined Benefit Pension Plan (Tables)	9 Months Ended
	Sep. 30, 2018
Defined Benefit Pension Plan [Abstract]
Net Pension Costs	   Nine Months Ended Three Months Ended  September 30, September 30,  (in thousands) 2018 2017 2018 2017  Service cost $ 1,027 $ 911 $ 342 $ 304  Interest cost 1,190 1,193 396 398  Expected return on plan assets (2,456) (2,205) (818) (735)  Amortization of net actuarial loss — 13 — 4  Net pension credit $ (239) $ (88) $ (80) $ (29) 

Fair Value Of Financial Instr_2

Fair Value Of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Of Financial Instruments [Abstract]
Assets Measured On Recurring Basis	   Fair Value Measurements Using:  Quoted Prices Significant  in Active Other Significant  Markets for Observable Unobservable  Identical Assets Inputs Inputs  (in thousands) Total (Level 1) (Level 2) (Level 3)  September 30, 2018:  Financial Assets:  Available-for-Sale Securities:  State and municipals $ 423,792 $ — $ 423,792 $ —  Pass-through mortgage securities 72,434 — 72,434 —  Collateralized mortgage obligations 246,613 — 246,613 —  Corporate Bonds 60,000 — 60,000 —  $ 802,839 $ — $ 802,839 $ —   Derivative - interest rate swap $ 281 $ — $ 281 $ —   December 31, 2017:  Financial Assets:  Available-for-Sale Securities:  State and municipals $ 461,323 $ — $ 461,323 $ —  Pass-through mortgage securities 71,391 — 71,391 —  Collateralized mortgage obligations 187,414 — 187,414 —  $ 720,128 $ — $ 720,128 $ — 
Assets Measured On Non-recurring Basis	   Fair Value Measurements Using:  Quoted Prices Significant  in Active Other Significant  Markets for Observable Unobservable  Identical Assets Inputs Inputs  (in thousands) Total (Level 1) (Level 2) (Level 3)  September 30, 2018:  Residential mortgages held-for-sale:  Closed-end $ 509 $ — $ — $ 509  Revolving home equity 162 — — 162  $ 671 $ — $ — $ 671  December 31, 2017:  Other real estate owned $ 5,125 $ — $ — $ 5,125 
Financial Instruments	   Level of September 30, 2018 December 31, 2017  Fair Value Carrying Carrying  (in thousands) Hierarchy Amount Fair Value Amount Fair Value  Financial Assets:  Cash and cash equivalents Level 1 $ 50,462 $ 50,462 $ 69,672 $ 69,672  Held-to-maturity securities Level 2 3,682 3,739 5,030 5,143  Held-to-maturity securities Level 3 3,163 3,163 2,606 2,606  Loans Level 3 3,187,744 2,998,186 2,916,568 2,855,812  Restricted stock Level 1 37,941 37,941 37,314 37,314   Financial Liabilities:  Checking deposits Level 1 946,236 946,236 896,129 896,129  Savings, NOW and money market deposits Level 1 1,679,617 1,679,617 1,602,460 1,602,460  Time deposits Level 2 534,656 528,725 323,408 323,108  Short-term borrowings Level 1 292,176 292,176 281,141 281,141  Long-term debt Level 2 403,027 392,865 423,797 418,465 

Derivatives (Tables)

Derivatives (Tables) - Cash Flow Hedging [Member]	9 Months Ended
	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Schedule Of Interest Rate Swaps	    Notional amount $150 million  Weighted average fixed pay rate 2.90%  Weighted average 3-month LIBOR receive rate Currently 2.32%  Weighted average maturity 2.68 Years 
Schedule Of Gains (Losses) Recorded In Accumulated Other Comprehensive Income And The Consolidated Statements Of Income	   Amount of Amount of Loss  Gain/(Loss) Amount of Loss Recognized in Other  Recognized in OCI Reclassified from OCI Noninterest Income  (in thousands) (Effective Portion) to Interest Expense (Ineffective Portion)  Interest rate contract:  Nine months ended September 30, 2018 $ (34) $ 315 $ —  Three months ended September 30, 2018 $ 462 $ 225 $ — 
Schedule Of Cash Flow Hedges Included In the Consolidated Balance Sheets	   Notional Fair Value  (in thousands) Amount Asset Liability  Included in other assets or other liabilities $ 281 $ —  Interest rate swap related to FHLB advances $ 150,000 

Basis of Presentation (Narrativ

Basis of Presentation (Narrative) (Details)	Sep. 30, 2018item
Bank [Member]
Number of subsidiaries	2

Earnings Per Share (Calculation

Earnings Per Share (Calculation Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income		$ 10,057	$ 9,342	$ 31,483	$ 27,556
Income allocated to participating securities	[1]	26	34	86	101
Income allocated to common stockholders		$ 10,031	$ 9,308	$ 31,397	$ 27,455
Common shares		25,409,087	24,332,939	25,236,889	24,096,079
Dilutive stock options and restricted stock units	[1]	144,933	247,127	174,095	253,715
Total		25,554,020	24,580,066	25,410,984	24,349,794
Basic		$ 0.39	$ 0.38	$ 1.24	$ 1.14
Diluted		$ 0.39	$ 0.38	$ 1.24	$ 1.13
[1]	Restricted stock units ("RSUs") awarded in 2016 accrue dividends at the same rate as the dividends declared by the Board of Directors on the Corporation's common stock. For purposes of computing EPS, these RSUs are considered to participate with common stock in the earnings of the Corporation and, therefore, the Corporation calculates basic and diluted EPS using the two-class method. Under the two-class method, net income for the period is allocated between common stockholders and participating securities according to dividends declared and participation rights in undistributed earnings. As a result, the RSUs awarded in 2016 are not included in the weighted average "dilutive stock options and restricted stock units" in the table above.

Comprehensive Income (Component

Comprehensive Income (Components Of Other Comprehensive Income And Related Tax Effects) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Change in net unrealized holding gains (losses) on available-for-sale securities:
Change arising during the period		$ (7,231)	$ (561)	$ (22,059)	$ 4,847
Reclassification adjustment for net (gains) losses included in net income	[1]	4,960	(16)	4,960	(73)
Change in net unrealized holding gains (losses) on available-for-sale securities		(2,271)	(577)	(17,099)	4,774
Tax effect		(686)	(242)	(5,166)	2,004
Total		(1,585)	(335)	(11,933)	2,770
Change in funded status of pension plan:
Amortization of net actuarial loss included in net income	[2]		4		13
Tax effect			2		6
Total			2		7
Change in unrealized gain on derivative instrument:
Amount of gain (loss) recognized during the period		462		(34)
Reclassification adjustment for net interest expense included in net income	[3]	225		315
Change in unrealized losses on derivative instruments		687		281
Tax effect		207		85
Total		480		196
Other comprehensive income (loss)		$ (1,105)	$ (333)	$ (11,737)	$ 2,777
[1]	Represents net realized gains or losses arising from the sale of available-for-sale securities. The net realized gains or losses are included in the consolidated statements of income in the line item, "Net gains (losses) on sales of securities." See "Note 4 - Investment Securities" for the income tax expense or benefit related to the net realized gains or losses, which is included in the consolidated statements of income in the line item, "Income tax expense."
[2]	Represents the amortization of net actuarial loss relating to the Corporation's defined benefit pension plan. This item is a component of net periodic pension cost (see "Note 7 - Defined Benefit Pension Plan")
[3]	Represents the net interest expense recorded on a derivative transaction and included in the consolidated statements of income in the line item "Interest expense - short-term borrowings."

Comprehensive Income (Compone_2

Comprehensive Income (Components Of Accumulated Other Comprehensive Income (Loss), Net Of Tax) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance				$ 354,450	$ 305,830
Other Comprehensive Income (Loss)		$ (1,105)	$ (333)	(11,737)	2,777
Balance		380,270	342,957	380,270	342,957
Unrealized Holding Gains (Losses) On Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance				2,600
Other Comprehensive Income (Loss)				(11,933)
Adoption of ASU 2018-02	[1]			361
Balance		(8,972)		(8,972)
Unrealized Actuarial Losses On Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance				(2,054)
Other Comprehensive Income (Loss)
Adoption of ASU 2018-02	[1]			(638)
Balance		(2,692)		(2,692)
Unrealized Gain On Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance
Other Comprehensive Income (Loss)				196
Adoption of ASU 2018-02	[1]
Balance		196		196
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance				546	(1,604)
Other Comprehensive Income (Loss)				(11,737)	2,777
Adoption of ASU 2018-02	[1]			(277)
Balance		$ (11,468)	$ 1,173	$ (11,468)	$ 1,173
[1]	The adoption of Accounting Standards Update ("ASU") 2018-02 "Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income" in the first quarter of 2018 allowed the Corporation to reclassify certain stranded tax effects arising from the enactment of the Tax Cuts and Jobs Act ("Tax Act") in December 2017 from accumulated other comprehensive income to retained earnings. See "Note 11 - Adoption of New Accounting Standards" for more information regarding the effects of adopting ASU 2018-02.

Investment Securities (Narrativ

Investment Securities (Narrative) (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2018USD ($)item	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)security	Sep. 30, 2018USD ($)itemsecurity	Sep. 30, 2017USD ($)	Dec. 31, 2017USD ($)item
Investment Securities [Line Items]
Income tax expense (benefit) related to net realized gains (losses)	$ 1,495,000	$ (7,000)		$ 1,495,000	$ (31,000)
Restricted investment securities	$ 463,501,000			$ 463,501,000		$ 423,360,000
Municipal Security [Member]
Investment Securities [Line Items]
Held-to-maturity securities, Number of sales | security			1
Mortgage-Backed Securities [Member]
Investment Securities [Line Items]
Held-to-maturity securities, Number of sales | security				0
Excludes U.S. Government And Its Agencies [Member]
Investment Securities [Line Items]
Number of holdings greater than 10 percent of stockholders equity | item	0			0		0
State And Municipals [Member] | Municipal Security [Member]
Investment Securities [Line Items]
Held-to-maturity securities, Carrying value			$ 354,000
Held-to-maturity securities, Realized gain			$ 1,000

Investment Securities (Amortiza

Investment Securities (Amortization Cost And Estimated Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule Of Amortized Cost And Estimated Fair Values [Line Items]
Held-to-Maturity Securities, Amortized Cost	$ 6,845	$ 7,636
Held-to-Maturity Securities, Gross Unrealized Gains	57	113
Held-to-Maturity Securities, Fair Value	6,902	7,749
Available-for-Sale Securities, Amortized Cost	815,682	715,872
Available-for-Sale Securities, Gross Unrealized Gains	2,970	10,150
Available-for-Sale Securities, Gross Unrealized Losses	(15,813)	(5,894)
Available-for-Sale Securities, Fair value	802,839	720,128
Corporate Bonds [Member]
Schedule Of Amortized Cost And Estimated Fair Values [Line Items]
Available-for-Sale Securities, Amortized Cost	60,000
Available-for-Sale Securities, Fair value	60,000
State And Municipals [Member]
Schedule Of Amortized Cost And Estimated Fair Values [Line Items]
Held-to-Maturity Securities, Amortized Cost	6,412	6,970
Held-to-Maturity Securities, Gross Unrealized Gains	42	78
Held-to-Maturity Securities, Fair Value	6,454	7,048
Available-for-Sale Securities, Amortized Cost	428,977	453,158
Available-for-Sale Securities, Gross Unrealized Gains	2,966	10,051
Available-for-Sale Securities, Gross Unrealized Losses	(8,151)	(1,886)
Available-for-Sale Securities, Fair value	423,792	461,323
Pass-Through Mortgage Securities [Member]
Schedule Of Amortized Cost And Estimated Fair Values [Line Items]
Held-to-Maturity Securities, Amortized Cost	274	311
Held-to-Maturity Securities, Gross Unrealized Gains	12	21
Held-to-Maturity Securities, Fair Value	286	332
Available-for-Sale Securities, Amortized Cost	74,576	72,539
Available-for-Sale Securities, Gross Unrealized Gains	4	84
Available-for-Sale Securities, Gross Unrealized Losses	(2,146)	(1,232)
Available-for-Sale Securities, Fair value	72,434	71,391
Collateralized Mortgage Obligations [Member]
Schedule Of Amortized Cost And Estimated Fair Values [Line Items]
Held-to-Maturity Securities, Amortized Cost	159	355
Held-to-Maturity Securities, Gross Unrealized Gains	3	14
Held-to-Maturity Securities, Fair Value	162	369
Available-for-Sale Securities, Amortized Cost	252,129	190,175
Available-for-Sale Securities, Gross Unrealized Gains		15
Available-for-Sale Securities, Gross Unrealized Losses	(5,516)	(2,776)
Available-for-Sale Securities, Fair value	$ 246,613	$ 187,414

Investment Securities (Securiti

Investment Securities (Securities With A Continuous Unrealized Losses Position) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	$ 414,075	$ 195,171
Less than 12 months, Unrealized Loss	(9,263)	(1,885)
12 months or more, Fair Value	83,024	136,126
12 months or more, Unrealized Loss	(6,550)	(4,009)
Total, Fair Value	497,099	331,297
Total, Unrealized Loss	(15,813)	(5,894)
State And Municipals [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	175,087	54,732
Less than 12 months, Unrealized Loss	(4,533)	(574)
12 months or more, Fair Value	34,708	28,723
12 months or more, Unrealized Loss	(3,618)	(1,312)
Total, Fair Value	209,795	83,455
Total, Unrealized Loss	(8,151)	(1,886)
Pass-Through Mortgage Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	51,251	10,172
Less than 12 months, Unrealized Loss	(886)	(81)
12 months or more, Fair Value	19,965	52,652
12 months or more, Unrealized Loss	(1,260)	(1,151)
Total, Fair Value	71,216	62,824
Total, Unrealized Loss	(2,146)	(1,232)
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, Fair Value	187,737	130,267
Less than 12 months, Unrealized Loss	(3,844)	(1,230)
12 months or more, Fair Value	28,351	54,751
12 months or more, Unrealized Loss	(1,672)	(1,546)
Total, Fair Value	216,088	185,018
Total, Unrealized Loss	$ (5,516)	$ (2,776)

Investment Securities (Sales Of

Investment Securities (Sales Of Available-For-Sale Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investment Securities [Abstract]
Proceeds	$ 169,631	$ 9,066	$ 169,631	$ 49,077
Gross gains	300	16	300	382
Gross losses	(5,260)		(5,260)	(309)
Net gain (loss)	$ (4,960)	$ 16	$ (4,960)	$ 73

Investment Securities (Maturiti

Investment Securities (Maturities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Held-to-Maturity Securities:
Held-to-maturity securities, Amortized Cost, Within one year	$ 4,335
Held-to-maturity securities, Fair Value, Within one year	4,339
Held-to-maturity securities, Amortized Cost, After 1 through 5 years	2,077
Held-to-maturity securities, Fair Value, After 1 through 5 years	2,115
Held-to-maturity securities, Amortized Cost, Mortgage-backed securities	433
Held-to-maturity securities, Fair Value, Mortgage-backed securities	448
Held-to-maturity securities, Amortized Cost	6,845	$ 7,636
Held-to-maturity securities, Fair Value	6,902	7,749
Available-for-Sale Securities:
Available-for-sale securities, Amortized Cost, Within one year	46,642
Available-for-sale securities, Fair Value, Within one year	47,179
Available-for-sale securities, Amortized Cost, After 1 through 5 years	37,623
Available-for-sale securities, Fair Value, After 1 through 5 years	37,733
Available-for-sale securities, Amortized Cost, After 5 through 10 years	227,010
Available-for-sale securities, Fair Value, After 5 through 10 years	225,866
Available-for-sale securities, Amortized Cost, After 10 years	177,702
Available-for-sale securities, Fair Value, After 10 years	173,014
Available-for-sale securities, Amortized Cost, Mortgage-backed securities	326,705
Available-for-sale securities, Fair Value, Mortgage-backed securities	319,047
Available-for-sale securities, Amortized Cost	815,682
Available-for-sale securities, Fair Value	$ 802,839	$ 720,128

Loans (Narrative) (Details)

Loans (Narrative) (Details)	9 Months Ended		12 Months Ended
	Sep. 30, 2018USD ($)loanitem	Sep. 30, 2017USD ($)loan	Dec. 31, 2017USD ($)loanpropertyitem
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of loans modified | loan	1	0
Allowance for loan losses, TDR	$ 16,000		$ 18,000
Number of days past due to be considered default	90 days
Minimum prior year principal balance of commercial Real estate loans required to be reviewed annually	80.00%
Deposit liabilities reclassified as loans receivable	$ 182,000		$ 297,000
Number of commitments to lend | item	0		0
Number of loans in the process of foreclosure | loan	0		0
Post modification balance	$ 0	$ 0
Residential Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of loans modified | loan	2
Real estate acquired through foreclosure	$ 0		$ 0
Post modification balance	$ 350,000
Commercial Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Number of OREO properties | property			1
Other real estate owned			$ 5,125,000
OREO Valuation allowance			$ 725,000

Loans (Loans Individually And C

Loans (Loans Individually And Collectively Evaluated For Impairment) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually Evaluated for Impairment - Loans	$ 5,411		$ 1,947
Collectively Evaluated for Impairment - Loans	3,215,884		2,948,405
Total Loans	3,221,295		2,950,352
Individually Evaluated for Impairment - Allowance for Loan Losses	16		18
Collectively Evaluated for Impairment - Allowance for Loan Losses	33,535		33,766
Ending balance, allowance	33,551	$ 35,832	33,784	$ 33,146	$ 32,136	$ 30,057
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually Evaluated for Impairment - Loans	53		48
Collectively Evaluated for Impairment - Loans	93,848		109,575
Total Loans	93,901		109,623
Collectively Evaluated for Impairment - Allowance for Loan Losses	1,152		1,441
Ending balance, allowance	1,152	1,298	1,441	1,657	1,544	1,408
Commercial Mortgages [Member] | Multifamily Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Collectively Evaluated for Impairment - Loans	733,132		682,593
Total Loans	733,132		682,593
Collectively Evaluated for Impairment - Allowance for Loan Losses	6,497		6,423
Ending balance, allowance	6,497	7,048	6,423	5,898	5,921	6,119
Commercial Mortgages [Member] | Other Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually Evaluated for Impairment - Loans	2,777
Collectively Evaluated for Impairment - Loans	426,987		414,783
Total Loans	429,764		414,783
Collectively Evaluated for Impairment - Allowance for Loan Losses	4,196		4,734
Ending balance, allowance	4,196	4,768	4,734	4,747	4,674	4,296
Commercial Mortgages [Member] | Owner-occupied Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually Evaluated for Impairment - Loans	522		531
Collectively Evaluated for Impairment - Loans	95,868		95,100
Total Loans	96,390		95,631
Collectively Evaluated for Impairment - Allowance for Loan Losses	826		1,076
Ending balance, allowance	826	911	1,076	1,575	1,685	959
Residential Mortgages [Member] | Closed-End [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually Evaluated for Impairment - Loans	970		1,368
Collectively Evaluated for Impairment - Loans	1,787,175		1,557,196
Total Loans	1,788,145		1,558,564
Individually Evaluated for Impairment - Allowance for Loan Losses	16		18
Collectively Evaluated for Impairment - Allowance for Loan Losses	20,295		19,329
Ending balance, allowance	20,311	20,953	19,347	18,105	17,035	15,740
Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually Evaluated for Impairment - Loans	756
Collectively Evaluated for Impairment - Loans	73,323		83,625
Total Loans	74,079		83,625
Collectively Evaluated for Impairment - Allowance for Loan Losses	507		689
Ending balance, allowance	507	775	689	1,090	1,203	1,401
Consumer And Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually Evaluated for Impairment - Loans	333
Collectively Evaluated for Impairment - Loans	5,551		5,533
Total Loans	5,884		5,533
Collectively Evaluated for Impairment - Allowance for Loan Losses	62		74
Ending balance, allowance	$ 62	$ 79	$ 74	$ 74	$ 74	$ 134

Loans (Allowance For Loan Losse

Loans (Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning balance	$ 35,832	$ 32,136	$ 33,784	$ 30,057
Chargeoffs	664	117	1,037	129
Recoveries	151	5	257	15
Provision for Loan Losses (Credit)	(1,768)	1,122	547	3,203
Allowance for loan losses, ending balance	33,551	33,146	33,551	33,146
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning balance	1,298	1,544	1,441	1,408
Chargeoffs	178	96	482	102
Recoveries		3	6	10
Provision for Loan Losses (Credit)	32	206	187	341
Allowance for loan losses, ending balance	1,152	1,657	1,152	1,657
Commercial Mortgages [Member] | Multifamily Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning balance	7,048	5,921	6,423	6,119
Provision for Loan Losses (Credit)	(551)	(23)	74	(221)
Allowance for loan losses, ending balance	6,497	5,898	6,497	5,898
Commercial Mortgages [Member] | Other Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning balance	4,768	4,674	4,734	4,296
Provision for Loan Losses (Credit)	(572)	73	(538)	451
Allowance for loan losses, ending balance	4,196	4,747	4,196	4,747
Commercial Mortgages [Member] | Owner-occupied Loan [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning balance	911	1,685	1,076	959
Provision for Loan Losses (Credit)	(85)	(110)	(250)	616
Allowance for loan losses, ending balance	826	1,575	826	1,575
Residential Mortgages [Member] | Closed-End [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning balance	20,953	17,035	19,347	15,740
Chargeoffs	393		413
Recoveries	1	1	101	3
Provision for Loan Losses (Credit)	(250)	1,069	1,276	2,362
Allowance for loan losses, ending balance	20,311	18,105	20,311	18,105
Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning balance	775	1,203	689	1,401
Chargeoffs	89		138
Recoveries	150		150
Provision for Loan Losses (Credit)	(329)	(113)	(194)	(311)
Allowance for loan losses, ending balance	507	1,090	507	1,090
Consumer And Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning balance	79	74	74	134
Chargeoffs	4	21	4	27
Recoveries		1		2
Provision for Loan Losses (Credit)	(13)	20	(8)	(35)
Allowance for loan losses, ending balance	$ 62	$ 74	$ 62	$ 74

Loans (Impaired Loans) (Details

Loans (Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Related Allowance	$ 16		$ 16		$ 18
Total, recorded investment	5,411		5,411		1,947
Total, unpaid principal balance	5,515		5,515		2,037
Total, average recorded investment	5,424	$ 10,026	5,460	$ 10,002
Total, interest income recognized	16	12	45	34
Commercial And Industrial [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment with no related allowance recorded	53		53		48
Unpaid principal balance with no related allowance recorded	53		53		48
Average recorded investment with no related allowance recorded	55	57	82	73
Interest income recognized with no related allowance recorded		2	2	4
Total, recorded investment	53		53		48
Total, unpaid principal balance	53		53		48
Total, average recorded investment	55	57	82	73
Total, interest income recognized		2	2	4
Commercial Mortgages [Member] | Other Loan [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment with no related allowance recorded	2,777		2,777
Unpaid principal balance with no related allowance recorded	2,777		2,777
Average recorded investment with no related allowance recorded	2,777		2,800
Total, recorded investment	2,777		2,777
Total, unpaid principal balance	2,777		2,777
Total, average recorded investment	2,777		2,800
Commercial Mortgages [Member] | Owner-occupied Loan [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment with no related allowance recorded	522		522		531
Unpaid principal balance with no related allowance recorded	606		606		615
Average recorded investment with no related allowance recorded	523	536	534	545
Interest income recognized with no related allowance recorded	6	5	18	16
Average recorded investment with an allowance recorded		6,977		7,079
Total, recorded investment	522		522		531
Total, unpaid principal balance	606		606		615
Total, average recorded investment	523	7,513	534	7,624
Total, interest income recognized	6	5	18	16
Residential Mortgages [Member] | Closed-End [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment with no related allowance recorded	712		712		1,095
Unpaid principal balance with no related allowance recorded	738		738		1,102
Related Allowance	16		16		18
Average recorded investment with no related allowance recorded	718	505	751	346
Interest income recognized with no related allowance recorded	1		4
Recorded investment with an allowance recorded	258		258		273
Unpaid principal balance with an allowance recorded	257		257		272
Average recorded investment with an allowance recorded	259	377	270	384
Interest income recognized with an allowance recorded	3	5	9	14
Total, recorded investment	970		970		1,368
Total, unpaid principal balance	995		995		$ 1,374
Total, average recorded investment	977	882	1,021	730
Total, interest income recognized	4	5	13	14
Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment with no related allowance recorded	756		756
Unpaid principal balance with no related allowance recorded	751		751
Average recorded investment with no related allowance recorded	756	1,574	757	1,575
Total, recorded investment	756		756
Total, unpaid principal balance	751		751
Total, average recorded investment	756	$ 1,574	757	$ 1,575
Consumer And Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded investment with no related allowance recorded	333		333
Unpaid principal balance with no related allowance recorded	333		333
Average recorded investment with no related allowance recorded	336		266
Interest income recognized with no related allowance recorded	6		12
Total, recorded investment	333		333
Total, unpaid principal balance	333		333
Total, average recorded investment	336		266
Total, interest income recognized	$ 6		$ 12

Loans (Aging Of The Recorded In

Loans (Aging Of The Recorded Investment In Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	$ 4,182	$ 1,000
Total past due loan & nonaccrual loans	5,320	3,756
Current	3,215,975	2,946,596
Loans	3,221,295	2,950,352
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	24
Total past due loan & nonaccrual loans	219	20
Current	93,682	109,603
Loans	93,901	109,623
Commercial Mortgages [Member] | Multifamily Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	733,132	682,593
Loans	733,132	682,593
Commercial Mortgages [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	2,777
Total past due loan & nonaccrual loans	2,777
Current	426,987	414,783
Loans	429,764	414,783
Commercial Mortgages [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	96,390	95,631
Loans	96,390	95,631
Residential Mortgages [Member] | Closed-End [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	625	1,000
Total past due loan & nonaccrual loans	1,286	3,207
Current	1,786,859	1,555,357
Loans	1,788,145	1,558,564
Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	756
Total past due loan & nonaccrual loans	1,029	522
Current	73,050	83,103
Loans	74,079	83,625
Consumer And Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due loan & nonaccrual loans	9	7
Current	5,875	5,526
Loans	5,884	5,533
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	492	2,735
30 to 59 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	195	20
30 to 59 Days Past Due [Member] | Residential Mortgages [Member] | Closed-End [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	37	2,186
30 to 59 Days Past Due [Member] | Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	251	522
30 to 59 Days Past Due [Member] | Consumer And Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	9	7
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	646	21
60 to 89 Days Past Due [Member] | Residential Mortgages [Member] | Closed-End [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	624	$ 21
60 to 89 Days Past Due [Member] | Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	$ 22

Loans (Risk Ratings) (Details)

Loans (Risk Ratings) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 3,221,295	$ 2,950,352
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	93,901	109,623
Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	92,758	108,846
Commercial And Industrial [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	450	450
Commercial And Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	199	279
Commercial And Industrial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	494	48
Commercial And Industrial [Member] | Internal Investment Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	93,901	109,623
Residential Mortgages [Member] | Closed-End [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,788,145	1,558,564
Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	74,079	83,625
Residential Mortgages [Member] | Pass [Member] | Closed-End [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,786,334	1,554,168
Residential Mortgages [Member] | Pass [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	73,070	82,665
Residential Mortgages [Member] | Watch [Member] | Closed-End [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	841	2,200
Residential Mortgages [Member] | Watch [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		256
Residential Mortgages [Member] | Special Mention [Member] | Closed-End [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		828
Residential Mortgages [Member] | Special Mention [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	253	704
Residential Mortgages [Member] | Substandard [Member] | Closed-End [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	970	1,368
Residential Mortgages [Member] | Substandard [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	756
Residential Mortgages [Member] | Internal Investment Grade [Member] | Closed-End [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,788,145	1,558,564
Residential Mortgages [Member] | Internal Investment Grade [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	74,079	83,625
Commercial Mortgages [Member] | Multifamily Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	733,132	682,593
Commercial Mortgages [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	429,764	414,783
Commercial Mortgages [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	96,390	95,631
Commercial Mortgages [Member] | Pass [Member] | Multifamily Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	730,699	673,128
Commercial Mortgages [Member] | Pass [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	411,407	404,379
Commercial Mortgages [Member] | Pass [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	91,802	93,618
Commercial Mortgages [Member] | Watch [Member] | Multifamily Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		2,354
Commercial Mortgages [Member] | Watch [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		7,567
Commercial Mortgages [Member] | Special Mention [Member] | Multifamily Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,433	7,111
Commercial Mortgages [Member] | Special Mention [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	15,580	2,837
Commercial Mortgages [Member] | Special Mention [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,043	1,482
Commercial Mortgages [Member] | Substandard [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,777
Commercial Mortgages [Member] | Substandard [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	545	531
Commercial Mortgages [Member] | Internal Investment Grade [Member] | Multifamily Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	733,132	682,593
Commercial Mortgages [Member] | Internal Investment Grade [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	429,764	414,783
Commercial Mortgages [Member] | Internal Investment Grade [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	96,390	95,631
Consumer And Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	5,884	5,533
Consumer And Other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	5,369	5,236
Consumer And Other [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	333
Consumer And Other [Member] | Internal Investment Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	5,702	5,236
Residential Mortgages, Home Equity Lines, And Other Consumer Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,864,773	1,642,069
Residential Mortgages, Home Equity Lines, And Other Consumer Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	841	2,456
Residential Mortgages, Home Equity Lines, And Other Consumer Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	253	1,532
Residential Mortgages, Home Equity Lines, And Other Consumer Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,059	1,368
Residential Mortgages, Home Equity Lines, And Other Consumer Loans [Member] | Internal Investment Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,867,926	1,647,425
Commercial And Industrial Loans And Commercial Real Estate Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,326,666	1,279,971
Commercial And Industrial Loans And Commercial Real Estate Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	450	10,371
Commercial And Industrial Loans And Commercial Real Estate Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	22,255	11,709
Commercial And Industrial Loans And Commercial Real Estate Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	3,816	579
Commercial And Industrial Loans And Commercial Real Estate Loans [Member] | Internal Investment Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 1,353,187	$ 1,302,630

Stock-based Compensation (Narra

Stock-based Compensation (Narrative) (Details)	9 Months Ended		12 Months Ended
	Sep. 30, 2018USD ($)shares	Sep. 30, 2017USD ($)shares	Dec. 31, 2017	Apr. 22, 2014shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense for share-based payments	$ 1,526,000	$ 1,925,000
Income tax benefits	460,000	808,000
Intrinsic value	734,000	1,062,000
Unrecognized compensation cost	$ 1,298,000
Weighted average period expected to be recognized	1 year
Proceeds from exercise of stock options	$ 153,000	604,000
Tax benefit from stock option exercised	$ 167,000	$ 445,000
Board Of Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for services | shares	1,834	1,445
RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of RSUs converted	$ 3,011,000	$ 1,779,000
Unrecognized compensation cost	$ 1,296,000
Weighted average period expected to be recognized	1 year
Performance-Based RSUs [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Conversion rate of RSUs to common stock	1.50		1.25
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost	$ 2,000
Weighted average period expected to be recognized	1 year 8 months 12 days
Cash used to settle stock options	$ 0	$ 0
Equity Incentive Plan 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized | shares	2,250,000
Number of shares available for issuance | shares	1,861,297
Equity Incentive Plan 2014 [Member] | RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for issuance | shares	405,653
Equity Incentive Plan 2014 [Member] | RSUs [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized | shares	787,500
Compensation Plan 2006 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized | shares				0
Compensation Plan 2006 [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	5 years
Award expiration period	10 years
Minimum exercise price percentage	100.00%

Stock-based Compensation (Summa

Stock-based Compensation (Summary Of RSU Vested And Expected To Vest) (Details) - RSUs [Member] - shares	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU granted	70,688
Number of RSUs outstanding	216,408	274,134
Equity Incentive Plan 2014 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU granted	385,159
Number of RSUs outstanding	216,408
RSU vested and expected to vest	216,408
Equity Incentive Plan 2014 [Member] | December 31, 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU vested and expected to vest	81,672
Equity Incentive Plan 2014 [Member] | December 31, 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU vested and expected to vest	91,582
Equity Incentive Plan 2014 [Member] | December 31, 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU vested and expected to vest	18,707
Equity Incentive Plan 2014 [Member] | December 31, 2021[Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU vested and expected to vest	24,447
Equity Incentive Plan 2014 [Member] | Twenty Fifteen [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU granted	112,868
Number of RSUs outstanding	1,200
RSU vested and expected to vest	1,200
Equity Incentive Plan 2014 [Member] | Twenty Fifteen [Member] | December 31, 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU vested and expected to vest	1,200
Equity Incentive Plan 2014 [Member] | Twenty Sixteen [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU granted	107,274
Number of RSUs outstanding	73,661
RSU vested and expected to vest	73,661
Equity Incentive Plan 2014 [Member] | Twenty Sixteen [Member] | December 31, 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU vested and expected to vest	66,115
Equity Incentive Plan 2014 [Member] | Twenty Sixteen [Member] | December 31, 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU vested and expected to vest	7,546
Equity Incentive Plan 2014 [Member] | Twenty Seventeen [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU granted	94,329
Number of RSUs outstanding	76,033
RSU vested and expected to vest	76,033
Equity Incentive Plan 2014 [Member] | Twenty Seventeen [Member] | December 31, 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU vested and expected to vest	62,857
Equity Incentive Plan 2014 [Member] | Twenty Seventeen [Member] | December 31, 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU vested and expected to vest	9,926
Equity Incentive Plan 2014 [Member] | Twenty Seventeen [Member] | December 31, 2021[Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU vested and expected to vest	3,250
Equity Incentive Plan 2014 [Member] | Twenty Eighteen [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSU granted	70,688
Number of RSUs outstanding	65,514
RSU vested and expected to vest	65,514
Equity Incentive Plan 2014 [Member] | Twenty Eighteen [Member] | December 31, 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU vested and expected to vest	14,357
Equity Incentive Plan 2014 [Member] | Twenty Eighteen [Member] | December 31, 2019 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU vested and expected to vest	21,179
Equity Incentive Plan 2014 [Member] | Twenty Eighteen [Member] | December 31, 2020 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU vested and expected to vest	8,781
Equity Incentive Plan 2014 [Member] | Twenty Eighteen [Member] | December 31, 2021[Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSU vested and expected to vest	21,197

Stock-based Compensation (RSU A

Stock-based Compensation (RSU Activity) (Details) - RSUs [Member] $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2018USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding, Number of RSUs | shares	274,134
Outstanding, Weighted-Average Grant-Date Fair Value | $ / shares	$ 19.64
Granted, Number of RSUs | shares	70,688
Granted, Weighted-Average Grant-Date Fair Value | $ / shares	$ 27.10
Converted, Number of RSUs | shares	(106,522)
Converted, Weighted-Average Grant-Date Fair Value | $ / shares	$ 15.56
Forfeited, Number of RSUs | shares	(21,892)
Forfeited, Weighted-Average Grant-Date Fair Value | $ / shares	$ 22.83
Outstanding, Number of RSUs | shares	216,408
Outstanding, Weighted-Average Grant-Date Fair Value | $ / shares	$ 23.76
Outstanding, Weighted Average Remaining Contractual Term	11 months 1 day
Outstanding, Aggregate Intrinsic Value | $	$ 4,707
Number of RSUs vested and convertible | shares
Vested and Convertible, Weighted-Average Grant-Date Fair Value | $ / shares
Vested and Convertible, Aggregate Intrinsic Value | $

Stock-based Compensation (Stock

Stock-based Compensation (Stock Option Activity) (Details) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2018USD ($)$ / sharesshares
Stock-based Compensation [Abstract]
Outstanding, Number of Options | shares	159,807
Outstanding, Weighted-Average Exercise Price | $ / shares	$ 11.35
Exercised, Number of Options | shares	(48,158)
Exercised, Weighted-Average Exercise Price | $ / shares	$ 10.79
Forfeited or expired, Number of Options | shares
Forfeited or expired, Weighted-Average Exercise Price | $ / shares
Outstanding, Number of Options | shares	111,649
Outstanding, Weighted-Average Exercise Price | $ / shares	$ 11.59
Outstanding, Weighted-Average Remaining Contractual Term	1 year 6 months
Outstanding, Aggregate Intrinsic Value | $	$ 1,134
Exercisable, Number of Options | shares	111,349
Exercisable, Weighted-Average Exercise Price | $ / shares	$ 11.57
Exercisable, Weighted-Average Remaining Contractual Term	1 year 5 months 27 days
Exercisable, Aggregate Intrinsic Value | $	$ 1,133

Defined Benefit Pension Plan (N

Defined Benefit Pension Plan (Narrative) (Details)	9 Months Ended
	Sep. 30, 2018USD ($)
Defined Benefit Plan Disclosure [Line Items]
Tax-deductible contribution for next year	$ 0
Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated minimum pension contribution	$ 0

Defined Benefit Pension Plan _2

Defined Benefit Pension Plan (Net Pension Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Defined Benefit Pension Plan [Abstract]
Service cost	$ 342	$ 304	$ 1,027	$ 911
Interest cost	396	398	1,190	1,193
Expected return on plan assets	(818)	(735)	(2,456)	(2,205)
Amortization of net actuarial loss		4		13
Net pension credit	$ (80)	$ (29)	$ (239)	$ (88)

Fair Value Of Financial Instr_3

Fair Value Of Financial Instruments (Narrative) (Details)	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2017USD ($)	Dec. 31, 2017USD ($)loan	Sep. 30, 2018USD ($)loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, Transfers between levels	$ 0	$ 0		$ 0
Provisions for loan losses	$ (530,000)	$ 338,000
Valuation allowance for other real estate owned			$ 725,000
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of impaired loans | loan			0	0

Fair Value Of Financial Instr_4

Fair Value Of Financial Instruments (Assets Measured On Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	$ 802,839	$ 720,128
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	802,839	720,128
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	802,839	720,128
Corporate Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	60,000
Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	60,000
Corporate Bonds [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	60,000
State And Municipals [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	423,792	461,323
State And Municipals [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	423,792	461,323
State And Municipals [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	423,792	461,323
Pass-Through Mortgage Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	72,434	71,391
Pass-Through Mortgage Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	72,434	71,391
Pass-Through Mortgage Securities [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	72,434	71,391
Collateralized Mortgage Obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	246,613	187,414
Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	246,613	187,414
Collateralized Mortgage Obligations [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	246,613	$ 187,414
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative	281
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative	$ 281

Fair Value Of Financial Instr_5

Fair Value Of Financial Instruments (Assets Measured On Non-recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgages held-for-sale	$ 671
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgages held-for-sale	671
Closed-End [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgages held-for-sale	509
Closed-End [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgages held-for-sale	509
Revolving Home Equity [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgages held-for-sale	162
Revolving Home Equity [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgages held-for-sale	$ 162
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned		$ 5,125
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned		$ 5,125

Fair Value Of Financial Instr_6

Fair Value Of Financial Instruments (Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Financial Assets:
Held-to-maturity securities	$ 6,902	$ 7,749
Restricted stock	37,941	37,314
Financial Liabilities:
Checking deposits	946,236	896,129
Savings, NOW and money market deposits	1,679,617	1,602,460
Carrying Amount [Member] | Level 1 [Member]
Financial Assets:
Cash and cash equivalents	50,462	69,672
Restricted stock	37,941	37,314
Financial Liabilities:
Checking deposits	946,236	896,129
Savings, NOW and money market deposits	1,679,617	1,602,460
Short-term borrowings	292,176	281,141
Carrying Amount [Member] | Level 2 [Member]
Financial Assets:
Held-to-maturity securities	3,682	5,030
Financial Liabilities:
Time deposits	534,656	323,408
Long-term debt	403,027	423,797
Carrying Amount [Member] | Level 3 [Member]
Financial Assets:
Held-to-maturity securities	3,163	2,606
Loans	3,187,744	2,916,568
Fair Value [Member] | Level 1 [Member]
Financial Assets:
Cash and cash equivalents	50,462	69,672
Restricted stock	37,941	37,314
Financial Liabilities:
Checking deposits	946,236	896,129
Savings, NOW and money market deposits	1,679,617	1,602,460
Short-term borrowings	292,176	281,141
Fair Value [Member] | Level 2 [Member]
Financial Assets:
Held-to-maturity securities	3,739	5,143
Financial Liabilities:
Time deposits	528,725	323,108
Long-term debt	392,865	418,465
Fair Value [Member] | Level 3 [Member]
Financial Assets:
Held-to-maturity securities	3,163	2,606
Loans	$ 2,998,186	$ 2,855,812

Revenue From Contracts With C_2

Revenue From Contracts With Customers (Narrative) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Revenue From Contracts With Customers [Abstract]
Revenue	$ 1,567,000	$ 1,426,000

Derivatives (Narrative) (Detail

Derivatives (Narrative) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2019	May 22, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest Expense	$ 9,568,000	$ 5,634,000	$ 25,777,000	$ 15,649,000
Collateral posted			281,000
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Cash Flow Hedge [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest Expense			315,000
Scenario, Forecast [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Cash Flow Hedge [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest Expense					$ 243,000
FHLB [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest Expense	$ 225,000		$ 315,000
Cash Flow Hedging [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Notional amount						$ 150,000,000

Derivatives (Schedule Of Intere

Derivatives (Schedule Of Interest Rate Swaps) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	May 22, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Weighted average maturity	2 years 8 months 5 days
Cash Flow Hedging [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount		$ 150
Weighted average fixed pay rate	2.90%
Weighted average 3-month LIBOR receive rate	2.32%

Derivatives (Schedule Of Gains

Derivatives (Schedule Of Gains (Losses) Recorded In Accumulated Other Comprehensive Income And The Consolidated Statements Of Income) (Details) - Cash Flow Hedging [Member] - Interest Rate Contract [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain/(Loss) Recognized in OCI (Effective Portion)	$ 462	$ (34)
Amount of Loss Reclassified from OCI to Interest Expense	$ 225	$ 315

Derivatives (Schedule Of Cash F

Derivatives (Schedule Of Cash Flow Hedges Included In the Consolidated Balance Sheets) (Details) - Cash Flow Hedging [Member] - USD ($) $ in Thousands	Sep. 30, 2018	May 22, 2018
Derivatives, Fair Value [Line Items]
Notional amount		$ 150,000
Other Assets Or Other Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair Value Asset	$ 281
Interest Rate Swap [Member] | FHLB [Member]
Derivatives, Fair Value [Line Items]
Notional amount	$ 150,000

Adoption Of New Accounting St_2

Adoption Of New Accounting Standards (Narrative) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2018USD ($)
Accumulated Other Comprehensive Income (Loss) [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of stranded tax effects upon the adoption of ASU 2018-02	$ (277)	[1]
[1]	The adoption of Accounting Standards Update ("ASU") 2018-02 "Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income" in the first quarter of 2018 allowed the Corporation to reclassify certain stranded tax effects arising from the enactment of the Tax Cuts and Jobs Act ("Tax Act") in December 2017 from accumulated other comprehensive income to retained earnings. See "Note 11 - Adoption of New Accounting Standards" for more information regarding the effects of adopting ASU 2018-02.

Subsequent Events (Narrative) (

Subsequent Events (Narrative) (Details) $ in Thousands	1 Months Ended
	Oct. 31, 2018USD ($)property	Sep. 30, 2018USD ($)	Dec. 31, 2017USD ($)
Subsequent Event [Line Items]
Available-for-sale securities, fair value		$ 802,839	$ 720,128
Subsequent Event [Member]
Subsequent Event [Line Items]
Number of branches sold | property	1
Pre-tax gain	$ 1,200
Mortgage-Backed Securities [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Available-for-sale securities, fair value	$ 61,600
Available-for-sale securities, Yield	2.51%
Pre-tax loss	$ 3,200
Overnight borrowing costs	2.47%