The First Bancorp, Inc. (FNLC) 10-Q 9 Aug 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Aug. 01, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	First Bancorp, Inc /ME/
Entity Central Index Key	765,207
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		10,854,862
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Assets
Cash and cash equivalents	$ 21,056	$ 19,207	$ 20,189
Interest bearing deposits in other banks	1,616	860	3,820
Securities available for sale	305,048
Securities available for sale		300,172	308,146
Securities to be held to maturity (fair value of $256,316,000 at June 30, 2018, $259,655,000 at December 31, 2017 and $246,238,000 at June 30, 2017)	260,077	256,567	244,123
Restricted equity securities, at cost	12,363	10,358	12,311
Loans held for sale	481	386	865
Loans	1,224,440	1,164,139	1,120,665
Less allowance for loan losses	11,472	10,729	10,611
Net loans	1,212,968	1,153,410	1,110,054
Accrued interest receivable	7,723	5,867	7,192
Premises and equipment, net	21,682	22,502	21,367
Other real estate owned	609	1,012	324
Goodwill	29,805	29,805	29,805
Other assets	40,533	42,784	37,455
Total assets	1,913,961	1,842,930	1,795,651
Liabilities
Demand deposits	146,964	145,332	137,061
NOW deposits	282,449	318,043	293,553
Money market deposits	100,378	163,898	134,760
Savings deposits	229,464	232,605	226,391
Certificates of deposit	657,391	559,001	527,494
Total deposits	1,416,646	1,418,879	1,319,259
Borrowed funds – short term	232,339	113,638	157,154
Borrowed funds – long term	65,116	115,120	125,123
Other liabilities	16,556	13,972	16,578
Total liabilities	1,730,657	1,661,609	1,618,114
Shareholders' equity
Common stock, one cent par value per share	109	108	108
Additional paid-in capital	62,246	61,747	61,218
Retained earnings	126,464	121,144	115,980
Accumulated other comprehensive income (loss)
Net unrealized loss on securities available for sale	(7,245)	(2,901)	(585)
Net unrealized loss on securities transferred from available for sale to held to maturity	(189)	(174)	(137)
Net unrealized gain on cash flow hedging derivative instruments	2,066	1,544	1,055
Net unrealized loss on postretirement benefit costs	(147)	(147)	(102)
Total shareholders' equity	183,304	181,321	177,537
Total liabilities & shareholders' equity	$ 1,913,961	$ 1,842,930	$ 1,795,651
Common Stock
Number of shares authorized (in shares)	18,000,000	18,000,000	18,000,000
Number of shares issued (in shares)	10,851,917	10,829,918	10,819,443
Number of shares outstanding (in shares)	10,851,917	10,829,918	10,819,443
Book value per common share (usd per share)	$ 16.89	$ 16.74	$ 16.41
Tangible book value per common share (usd per share)	$ 14.13	$ 13.97	$ 13.63

Consolidated Balance Sheets (U3

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Assets
Securities to be held to maturity, fair value	$ 256,316	$ 259,655	$ 246,238
Common stock, par value per share	$ 0.01	$ 0.01	$ 0.01

Consolidated Statements of Inco

Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Interest income
Interest and fees on loans (includes tax-exempt income of $473,000 as of June 30, 2018 and $380,000 as of June 30, 2017)	$ 13,038	$ 11,115	$ 25,429	$ 21,767
Interest on deposits with other banks	6	8	17	23
Interest and dividends on investments (includes tax-exempt income of $3,462,000 as of June 30, 2018 and $3,238,000 as of June 30, 2017)	4,161	3,879	8,210	7,703
Total interest income	17,205	15,002	33,656	29,493
Interest expense
Interest on deposits	3,758	2,302	6,857	4,296
Interest on borrowed funds	1,178	1,035	2,121	2,056
Total interest expense	4,936	3,337	8,978	6,352
Net interest income	12,269	11,665	24,678	23,141
Provision for loan losses	500	500	1,000	1,000
Net interest income after provision for loan losses	11,769	11,165	23,678	22,141
Non-interest income
Net securities gains	0	0	136	3
Other operating income	1,448	1,315	2,846	2,690
Total non-interest income	3,181	3,002	6,313	5,845
Non-interest expense
Salaries and employee benefits	4,280	3,873	8,770	7,843
Occupancy expense	598	603	1,297	1,227
Furniture and equipment expense	915	890	1,844	1,760
FDIC insurance premiums	334	263	613	503
Amortization of identified intangibles	11	11	22	22
Other operating expense	2,038	2,000	4,209	3,983
Total non-interest expense	8,176	7,640	16,755	15,338
Income before income taxes	6,774	6,527	13,236	12,648
Income tax expense	1,040	1,644	1,996	3,128
NET INCOME	$ 5,734	$ 4,883	$ 11,240	$ 9,520
Basic earnings per common share (usd per share)	$ 0.53	$ 0.45	$ 1.04	$ 0.89
Diluted earnings per common share (usd per share)	$ 0.53	$ 0.45	$ 1.04	$ 0.88
Other comprehensive income (loss) net of tax
Net unrealized gain (loss) on securities available for sale	$ (1,035)	$ 349	$ (4,344)	$ 350
Net unrealized loss on securities transferred from available for sale to held to maturity, net of amortization	(7)	(4)	(15)	(8)
Net unrealized gain (loss) on cash flow hedging derivative instruments	138	(171)	522	(108)
Other comprehensive income (loss)	(904)	174	(3,837)	234
Comprehensive income	4,830	5,057	7,403	9,754
Investment management and fiduciary income
Non-interest income
Non-interest income	802	709	1,542	1,340
Service charges on deposit accounts
Non-interest income
Non-interest income	570	549	1,097	1,051
Mortgage origination and servicing income, net of amortization
Non-interest income
Non-interest income	$ 361	$ 429	$ 692	$ 761

Consolidated Statements of Inc5

Consolidated Statements of Income and Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Interest and fees on loans (tax-exempt income)	$ 473	$ 380
Interest and dividends on investments (tax-exempt income)	$ 3,462	$ 3,238

Consolidated Statements of Chan

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common stock and additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)
Beginning balance (in shares) at Dec. 31, 2016		10,793,946
Beginning balance at Dec. 31, 2016	$ 172,521	$ 60,831	$ 111,693	$ (3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,520		9,520
Net unrealized gain on securities available for sale, net of tax	350			350
Net unrealized gain on cash flow hedging derivative instruments, net of tax	(108)			(108)
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(8)			(8)
Comprehensive income	9,754		9,520	234
Cash dividends declared	(5,085)		(5,085)
Equity compensation expense	166	$ 166
Payment to repurchase of common stock (in shares)		(5,333)
Payment to repurchase common stock	$ (148)		(148)
Issuance of restricted stock (in shares)	0	18,850
Proceeds from sale of common stock (in shares)		11,980
Proceeds from sale of common stock	$ 329	$ 329
Ending balance (in shares) at Jun. 30, 2017	10,819,443	10,819,443
Ending balance at Jun. 30, 2017	$ 177,537	$ 61,326	115,980	231
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	4,883
Net unrealized gain on securities available for sale, net of tax	349
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	$ (4)
Ending balance (in shares) at Jun. 30, 2017	10,819,443	10,819,443
Ending balance at Jun. 30, 2017	$ 177,537	$ 61,326	115,980	231
Beginning balance (in shares) at Dec. 31, 2017	10,829,918	10,829,918
Beginning balance at Dec. 31, 2017	$ 181,321	$ 61,855	121,144	(1,678)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11,240		11,240
Net unrealized gain on securities available for sale, net of tax	(4,344)			(4,344)
Net unrealized gain on cash flow hedging derivative instruments, net of tax	522			522
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	(15)			(15)
Comprehensive income	7,403		11,240	(3,837)
Cash dividends declared	(5,754)		(5,754)
Equity compensation expense	190	$ 190
Payment to repurchase of common stock (in shares)		(5,725)
Payment to repurchase common stock	$ (166)		(166)
Issuance of restricted stock (in shares)	0	16,795
Proceeds from sale of common stock (in shares)		10,929
Proceeds from sale of common stock	$ 310	$ 310
Ending balance (in shares) at Jun. 30, 2018	10,851,917	10,851,917
Ending balance at Jun. 30, 2018	$ 183,304	$ 62,355	126,464	(5,515)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,734
Net unrealized gain on securities available for sale, net of tax	(1,035)
Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax	$ (7)
Ending balance (in shares) at Jun. 30, 2018	10,851,917	10,851,917
Ending balance at Jun. 30, 2018	$ 183,304	$ 62,355	$ 126,464	$ (5,515)

Consolidated Statements of Cha7

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (usd per share)	$ 0.53	$ 0.47

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Net income	$ 11,240	$ 9,520
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	910	908
Change in deferred taxes	(402)	98
Provision for loan losses	1,000	1,000
Loans originated for resale	(10,480)	(17,070)
Proceeds from sales and transfers of loans	10,577	17,280
Net gain on sales of loans	(192)	(293)
Net gain on sale or call of securities	(136)	(3)
Net amortization of premiums on investments	1,068	1,808
Net gain on sale of other real estate owned	(183)	(74)
Equity compensation expense	190	166
Net (increase) decrease in other assets and accrued interest	1,056	(3,338)
Net increase (decrease) in other liabilities	3,350	(943)
Net loss on disposal of premises and equipment	127	7
Amortization of investment in limited partnership	86	89
Net acquisition amortization	22	22
Net cash provided by operating activities	18,233	9,180
Cash flows from investing activities
Increase in interest-bearing deposits in other banks	(756)	(3,527)
Proceeds from sales of securities available for sale	459	3
Proceeds from maturities, payments and calls of securities available for sale	28,886	123,896
Proceeds from maturities, payments and calls of securities to be held to maturity	6,500	7,022
Proceeds from sales of other real estate owned	815	336
Purchases of securities available for sale	(40,677)	(133,056)
Purchases of securities to be held to maturity	(10,004)	(24,169)
Purchase of restricted equity securities	(2,005)	(381)
Net increase in loans	(60,787)	(49,880)
Capital expenditures	(217)	(80)
Net cash used by investing activities	(77,786)	(79,836)
Cash flows from financing activities
Net increase (decrease) in demand, savings, and money market accounts	(100,623)	25,428
Net increase in certificates of deposit	98,390	50,874
Net increase (decrease) in short-term borrowings	138,697	(21,624)
Advances on long-term borrowings	0	50,000
Repayment on long-term borrowings	(70,000)	(25,000)
Payment to repurchase common stock	(166)	(148)
Proceeds from sale of common stock	310	329
Dividends paid	(5,206)	(6,380)
Net cash provided by financing activities	61,402	73,479
Net increase in cash and cash equivalents	1,849	2,823
Cash and cash equivalents at beginning of period	19,207	17,366
Cash and cash equivalents at end of period	21,056	20,189
Interest paid	8,677	6,228
Income taxes paid	441	2,470
Non-cash transactions
Net transfer from loans to other real estate owned	$ 229	$ 214

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The First Bancorp, Inc. ("the Company") is a financial holding company that owns all of the common stock of First National Bank ("the Bank"). The accompanying unaudited consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of Management, all adjustments (consisting of normally recurring accruals) considered necessary for a fair presentation have been included. All significant intercompany transactions and balances are eliminated in consolidation. The income reported for the 2018 period is not necessarily indicative of the results that may be expected for the year ending December 31, 2018 . For further information, refer to the consolidated financial statements and notes included in the Company's annual report on Form 10-K for the year ended December 31, 2017 . Subsequent Events Events occurring subsequent to June 30, 2018 , have been evaluated as to their potential impact to the financial statements.

Investment Securities

Investment Securities	6 Months Ended
	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Investment Securities	Investment Securities The following table summarizes the amortized cost and estimated fair value of investment securities at June 30, 2018 : Amortized Cost Unrealized Gains Unrealized Losses Fair Value (Estimated) Securities available for sale Mortgage-backed securities $ 306,286,000 $ 144,000 $ (9,052,000 ) $ 297,378,000 State and political subdivisions 4,955,000 $ — (263,000 ) 4,692,000 Other equity securities 2,978,000 — — 2,978,000 $ 314,219,000 $ 144,000 $ (9,315,000 ) $ 305,048,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 11,155,000 $ — $ (584,000 ) $ 10,571,000 Mortgage-backed securities 20,585,000 404,000 (365,000 ) 20,624,000 State and political subdivisions 224,037,000 1,274,000 (4,490,000 ) 220,821,000 Corporate securities 4,300,000 — — 4,300,000 $ 260,077,000 $ 1,678,000 $ (5,439,000 ) $ 256,316,000 Restricted equity securities Federal Home Loan Bank Stock $ 11,326,000 $ — $ — $ 11,326,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 12,363,000 $ — $ — $ 12,363,000 The following table summarizes the amortized cost and estimated fair value of investment securities at December 31, 2017 : Amortized Cost Unrealized Gains Unrealized Losses Fair Value (Estimated) Securities available for sale Mortgage-backed securities $ 293,689,000 $ 722,000 $ (4,422,000 ) $ 289,989,000 State and political subdivisions 6,860,000 16,000 (107,000 ) 6,769,000 Other equity securities 3,296,000 121,000 (3,000 ) 3,414,000 $ 303,845,000 $ 859,000 $ (4,532,000 ) $ 300,172,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 11,155,000 $ — $ (180,000 ) $ 10,975,000 Mortgage-backed securities 23,284,000 568,000 (128,000 ) 23,724,000 State and political subdivisions 217,828,000 3,931,000 (1,103,000 ) 220,656,000 Corporate securities 4,300,000 — — 4,300,000 $ 256,567,000 $ 4,499,000 $ (1,411,000 ) $ 259,655,000 Restricted equity securities Federal Home Loan Bank Stock $ 9,321,000 $ — $ — $ 9,321,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 10,358,000 $ — $ — $ 10,358,000 The following table summarizes the amortized cost and estimated fair value of investment securities at June 30, 2017 : Amortized Cost Unrealized Gains Unrealized Losses Fair Value (Estimated) Securities available for sale Mortgage-backed securities $ 290,379,000 $ 1,381,000 $ (2,769,000 ) $ 288,991,000 State and political subdivisions 15,401,000 486,000 (59,000 ) 15,828,000 Other equity securities 3,266,000 65,000 (4,000 ) 3,327,000 $ 309,046,000 $ 1,932,000 $ (2,832,000 ) $ 308,146,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 11,152,000 $ — $ (181,000 ) $ 10,971,000 Mortgage-backed securities 27,224,000 820,000 (41,000 ) 28,003,000 State and political subdivisions 201,447,000 3,573,000 (2,056,000 ) 202,964,000 Corporate securities 4,300,000 — — 4,300,000 $ 244,123,000 $ 4,393,000 $ (2,278,000 ) $ 246,238,000 Restricted equity securities Federal Home Loan Bank Stock $ 11,274,000 $ — $ — $ 11,274,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 12,311,000 $ — $ — $ 12,311,000 The following table summarizes the contractual maturities of investment securities at June 30, 2018 : Securities available for sale Securities to be held to maturity Amortized Cost Fair Value (Estimated) Amortized Cost Fair Value (Estimated) Due in 1 year or less $ 34,000 $ 34,000 $ 1,327,000 $ 1,329,000 Due in 1 to 5 years 9,349,000 9,341,000 23,621,000 23,698,000 Due in 5 to 10 years 71,309,000 69,745,000 155,096,000 153,240,000 Due after 10 years 230,549,000 222,950,000 80,033,000 78,049,000 Equity securities 2,978,000 2,978,000 — — $ 314,219,000 $ 305,048,000 $ 260,077,000 $ 256,316,000 The following table summarizes the contractual maturities of investment securities at December 31, 2017 : Securities available for sale Securities to be held to maturity Amortized Cost Fair Value (Estimated) Amortized Cost Fair Value (Estimated) Due in 1 year or less $ 111,000 $ 112,000 $ 635,000 $ 637,000 Due in 1 to 5 years 841,000 842,000 18,059,000 18,164,000 Due in 5 to 10 years 29,003,000 29,177,000 37,182,000 37,719,000 Due after 10 years 270,594,000 266,627,000 200,691,000 203,135,000 Equity securities 3,296,000 3,414,000 — — $ 303,845,000 $ 300,172,000 $ 256,567,000 $ 259,655,000 The following table summarizes the contractual maturities of investment securities at June 30, 2017 : Securities available for sale Securities to be held to maturity Amortized Cost Fair Value (Estimated) Amortized Cost Fair Value (Estimated) Due in 1 year or less $ 26,000 $ 26,000 $ 707,000 $ 710,000 Due in 1 to 5 years 1,722,000 1,758,000 14,536,000 14,813,000 Due in 5 to 10 years 34,382,000 35,099,000 41,373,000 42,251,000 Due after 10 years 269,650,000 267,936,000 187,507,000 188,464,000 Equity securities 3,266,000 3,327,000 — — $ 309,046,000 $ 308,146,000 $ 244,123,000 $ 246,238,000 At June 30, 2018 , securities with a fair value of $203,196,000 were pledged to secure public deposits, repurchase agreements, and for other purposes as required by law. This compares to securities with a fair value of $231,516,000 as of December 31, 2017 and $188,448,000 at June 30, 2017 , pledged for the same purposes. Gains and losses on the sale of securities available for sale are computed by subtracting the amortized cost at the time of sale from the security's selling price, net of accrued interest to be received. The following table shows securities gains and losses for the six months and quarters ended June 30, 2018 and 2017 : For the six months ended June 30, For the quarter ended June 30, 2018 2017 2018 2017 Proceeds from sales of securities $ 459,000 $ 3,000 $ — $ — Gross realized gains 136,000 3,000 — — Gross realized losses — — — — Net gain $ 136,000 $ 3,000 $ — $ — Related income taxes $ 29,000 $ 1,000 $ — $ — Management reviews securities with unrealized losses for other than temporary impairment. As of June 30, 2018 , there were 480 securities with unrealized losses held in the Company's portfolio. These securities were temporarily impaired as a result of changes in interest rates reducing their fair value, of which 160 had been temporarily impaired for 12 months or more. At June 30, 2018 , there were no material changes in the credit quality of these securities resulting in other than temporary impairment, and in Management's opinion, no additional write-down for other-than-temporary impairment is warranted. Information regarding securities temporarily impaired as of June 30, 2018 is summarized below: Less than 12 months 12 months or more Total Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses U.S. Government-sponsored agencies $ 6,882,000 $ (373,000 ) $ 3,689,000 $ (211,000 ) $ 10,571,000 $ (584,000 ) Mortgage-backed securities 202,673,000 (5,660,000 ) 91,977,000 (3,757,000 ) 294,650,000 (9,417,000 ) State and political subdivisions 70,674,000 (1,728,000 ) 36,909,000 (3,025,000 ) 107,583,000 (4,753,000 ) $ 280,229,000 $ (7,761,000 ) $ 132,575,000 $ (6,993,000 ) $ 412,804,000 $ (14,754,000 ) As of December 31, 2017 , there were 241 securities with unrealized losses held in the Company's portfolio. These securities were temporarily impaired as a result of changes in interest rates reducing their fair value, of which 157 had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of December 31, 2017 is summarized below: Less than 12 months 12 months or more Total Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses U.S. Government-sponsored agencies $ 7,161,000 $ (94,000 ) $ 3,814,000 $ (86,000 ) $ 10,975,000 $ (180,000 ) Mortgage-backed securities 132,025,000 (1,857,000 ) 101,707,000 (2,693,000 ) 233,732,000 (4,550,000 ) State and political subdivisions 9,425,000 (149,000 ) 38,864,000 (1,061,000 ) 48,289,000 (1,210,000 ) Other equity securities — — 9,000 (3,000 ) 9,000 (3,000 ) $ 148,611,000 $ (2,100,000 ) $ 144,394,000 $ (3,843,000 ) $ 293,005,000 $ (5,943,000 ) As of June 30, 2017 , there were 235 securities with unrealized losses held in the Company's portfolio. These securities were temporarily impaired as a result of changes in interest rates reducing their fair value, of which 15 had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of June 30, 2017 is summarized below: Less than 12 months 12 months or more Total Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses U.S. Government-sponsored agencies $ 7,972,000 $ (181,000 ) $ — $ — $ 7,972,000 $ (181,000 ) Mortgage-backed securities 170,966,000 (2,613,000 ) 7,643,000 (197,000 ) 178,609,000 (2,810,000 ) State and political subdivisions 55,952,000 (2,115,000 ) — — 55,952,000 (2,115,000 ) Other equity securities 69,000 (1,000 ) 9,000 (3,000 ) 78,000 (4,000 ) $ 234,959,000 $ (4,910,000 ) $ 7,652,000 $ (200,000 ) $ 242,611,000 $ (5,110,000 ) During the third quarter of 2014, the Company transferred securities with a total amortized cost of $89,780,000 with a corresponding fair value of $89,757,000 from available for sale to held to maturity. The net unrealized loss, net of taxes, on these securities at the date of the transfer was $15,000 . The net unrealized holding loss at the time of transfer continues to be reported in accumulated other comprehensive income (loss), net of tax and is amortized over the remaining lives of the securities as an adjustment of the yield. The amortization of the net unrealized loss reported in accumulated other comprehensive income (loss) will offset the effect on interest income of the discount for the transferred securities. The remaining unamortized balance of the net unrealized losses for the securities transferred from available for sale to held to maturity was $189,000 at June 30, 2018 . These securities were transferred as a part of the Company's overall investment and balance sheet strategies. The Bank is a member of the Federal Home Loan Bank ("FHLB") of Boston, a cooperatively owned wholesale bank for housing and finance in the six New England States. As a requirement of membership in the FHLB, the Bank must own a minimum required amount of FHLB stock, calculated periodically based primarily on its level of borrowings from the FHLB. The Bank uses the FHLB for a portion of its wholesale funding needs. As of June 30, 2018 and 2017 , and December 31, 2017 , the Bank's investment in FHLB stock totaled $11,326,000 , $11,274,000 and $9,321,000 , respectively. FHLB stock is a non-marketable equity security and therefore is reported at cost, which equals par value. The Company periodically evaluates its investment in FHLB stock for impairment based on, among other factors, the capital adequacy of the FHLB and its overall financial condition. No impairment losses have been recorded through June 30, 2018 . The Company will continue to monitor its investment in FHLB stock.

Loans

Loans	6 Months Ended
	Jun. 30, 2018
Loans and Leases Receivable Disclosure [Abstract]
Loans	Loans The following table shows the composition of the Company's loan portfolio as of June 30, 2018 and 2017 and at December 31, 2017 : June 30, 2018 December 31, 2017 June 30, 2017 Commercial Real estate $ 350,114,000 28.6 % $ 323,809,000 27.8 % $ 306,490,000 27.4 % Construction 40,308,000 3.3 % 38,056,000 3.3 % 33,605,000 3.0 % Other 184,718,000 15.1 % 181,528,000 15.6 % 173,691,000 15.5 % Municipal 48,717,000 4.0 % 33,391,000 2.9 % 28,695,000 2.6 % Residential Term 453,588,000 37.0 % 432,661,000 37.1 % 427,171,000 38.1 % Construction 14,583,000 1.2 % 17,868,000 1.5 % 15,056,000 1.3 % Home equity line of credit 107,666,000 8.8 % 111,302,000 9.6 % 110,328,000 9.8 % Consumer 24,746,000 2.0 % 25,524,000 2.2 % 25,629,000 2.3 % Total $ 1,224,440,000 100.0 % $ 1,164,139,000 100.0 % $ 1,120,665,000 100.0 % Loan balances include net deferred loan costs of $6,307,000 as of June 30, 2018 , $5,748,000 as of December 31, 2017 , and $5,469,000 as of June 30, 2017 . Pursuant to collateral agreements, qualifying first mortgage loans and commercial real estate loans, which totaled $317,053,000 at June 30, 2018 , were used to collateralize borrowings from the FHLB. This compares to qualifying first mortgages loans which totaled $239,805,000 at December 31, 2017 , and $249,329,000 at June 30, 2017 . In addition, commercial, construction and home equity loans totaling $227,084,000 at June 30, 2018 , $290,247,000 at December 31, 2017 , and $294,315,000 at June 30, 2017 , were used to collateralize a standby line of credit at the Federal Reserve Bank of Boston that is currently unused. For all loan classes, loans over 30 days past due are considered delinquent. Information on the past-due status of loans by class of financing receivable as of June 30, 2018 , is presented in the following table: 30-59 Days Past Due 60-89 Days Past Due 90+ Days Past Due All Past Due Current Total 90+ Days & Accruing Commercial Real estate $ 137,000 $ 75,000 $ 503,000 $ 715,000 $ 349,399,000 $ 350,114,000 $ — Construction — — — — 40,308,000 40,308,000 — Other 459,000 42,000 294,000 795,000 183,923,000 184,718,000 — Municipal — — — — 48,717,000 48,717,000 — Residential Term 531,000 2,014,000 1,730,000 4,275,000 449,313,000 453,588,000 — Construction — — — — 14,583,000 14,583,000 — Home equity line of credit 915,000 38,000 575,000 1,528,000 106,138,000 107,666,000 — Consumer 70,000 37,000 18,000 125,000 24,621,000 24,746,000 3,000 Total $ 2,112,000 $ 2,206,000 $ 3,120,000 $ 7,438,000 $ 1,217,002,000 $ 1,224,440,000 $ 3,000 Information on the past-due status of loans by class of financing receivable as of December 31, 2017 , is presented in the following table: 30-59 Days Past Due 60-89 Days Past Due 90+ Days Past Due All Past Due Current Total 90+ Days & Accruing Commercial Real estate $ 574,000 $ 80,000 $ 220,000 $ 874,000 $ 322,935,000 $ 323,809,000 $ — Construction — — — — 38,056,000 38,056,000 — Other 542,000 6,663,000 574,000 7,779,000 173,749,000 181,528,000 — Municipal — — — — 33,391,000 33,391,000 — Residential Term 1,031,000 4,372,000 2,256,000 7,659,000 425,002,000 432,661,000 436,000 Construction 101,000 370,000 — 471,000 17,397,000 17,868,000 — Home equity line of credit 537,000 445,000 725,000 1,707,000 109,595,000 111,302,000 — Consumer 159,000 18,000 9,000 186,000 25,338,000 25,524,000 9,000 Total $ 2,944,000 $ 11,948,000 $ 3,784,000 $ 18,676,000 $ 1,145,463,000 $ 1,164,139,000 $ 445,000 Information on the past-due status of loans by class of financing receivable as of June 30, 2017 , is presented in the following table: 30-59 Days Past Due 60-89 Days Past Due 90+ Days Past Due All Past Due Current Total 90+ Days & Accruing Commercial Real estate $ 88,000 $ — $ 1,387,000 $ 1,475,000 $ 305,015,000 $ 306,490,000 $ — Construction — — — — 33,605,000 33,605,000 — Other 29,000 259,000 515,000 803,000 172,888,000 173,691,000 — Municipal — — — — 28,695,000 28,695,000 — Residential Term 533,000 3,343,000 1,507,000 5,383,000 421,788,000 427,171,000 — Construction 99,000 — — 99,000 14,957,000 15,056,000 — Home equity line of credit 440,000 406,000 751,000 1,597,000 108,731,000 110,328,000 — Consumer 282,000 118,000 29,000 429,000 25,200,000 25,629,000 29,000 Total $ 1,471,000 $ 4,126,000 $ 4,189,000 $ 9,786,000 $ 1,110,879,000 $ 1,120,665,000 $ 29,000 For all classes, loans are placed on non-accrual status when, based on current information and events, it is probable that the Company will be unable to collect all amounts due according to the contractual terms of the loan agreement or when principal and interest is 90 days or more past due unless the loan is both well secured and in the process of collection (in which case the loan may continue to accrue interest in spite of its past due status). A loan is "well secured" if it is secured (1) by collateral in the form of liens on or pledges of real or personal property, including securities, that have a realizable value sufficient to discharge the debt (including accrued interest) in full, or (2) by the guarantee of a financially responsible party. A loan is "in the process of collection" if collection of the loan is proceeding in due course either (1) through legal action, including judgment enforcement procedures, or, (2) in appropriate circumstances, through collection efforts not involving legal action which are reasonably expected to result in repayment of the debt or in its restoration to a current status in the near future. Cash payments received on non-accrual loans, which are included in impaired loans, are applied to reduce the loan's principal balance until the remaining principal balance is deemed collectible, after which interest is recognized when collected. As a general rule, a loan may be restored to accrual status when payments are current for a substantial period of time, generally six months, and repayment of the remaining contractual amounts is expected, or when it otherwise becomes well secured and in the process of collection. Information on nonaccrual loans as of June 30, 2018 and 2017 and at December 31, 2017 is presented in the following table: June 30, 2018 December 31, 2017 June 30, 2017 Commercial Real estate $ 981,000 $ 752,000 $ 1,814,000 Construction 286,000 — — Other 8,900,000 9,357,000 885,000 Municipal — — — Residential Term 3,509,000 3,778,000 3,852,000 Construction — — — Home equity line of credit 689,000 833,000 883,000 Consumer 16,000 16,000 — Total $ 14,381,000 $ 14,736,000 $ 7,434,000 Impaired loans include troubled debt restructured ("TDR") and loans placed on non-accrual. These loans are measured at the present value of expected future cash flows discounted at the loan's effective interest rate or at the fair value of the collateral if the loan is collateral dependent. If the measure of an impaired loan is lower than the recorded investment in the loan and estimated selling costs, a specific reserve is established for the difference, or, in certain situations, if the measure of an impaired loan is lower than the recorded investment in the loan and estimated selling costs, the difference is written off. A breakdown of impaired loans by class of financing receivable as of and for the period ended June 30, 2018 is presented in the following table: For the six months ended June 30, 2018 For the quarter ended June 30, 2018 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 5,438,000 $ 5,749,000 $ — $ 4,666,000 $ 110,000 $ 5,169,000 $ 56,000 Construction 1,027,000 1,027,000 — 789,000 21,000 837,000 11,000 Other 2,265,000 2,349,000 — 2,287,000 17,000 2,272,000 11,000 Municipal — — — — — — — Residential Term 9,613,000 10,808,000 — 9,671,000 151,000 9,642,000 80,000 Construction — — — — — — — Home equity line of credit 928,000 1,021,000 — 1,004,000 9,000 918,000 4,000 Consumer 16,000 29,000 — 16,000 — 16,000 — $ 19,287,000 $ 20,983,000 $ — $ 18,433,000 $ 308,000 $ 18,854,000 $ 162,000 With an Allowance Recorded Commercial Real estate $ 3,470,000 $ 3,488,000 $ 270,000 $ 3,819,000 $ 67,000 $ 3,749,000 $ 28,000 Construction — — — — — — — Other 7,174,000 7,388,000 1,647,000 7,176,000 — 7,170,000 — Municipal — — — — — — — Residential Term 2,161,000 2,378,000 286,000 2,027,000 48,000 2,086,000 24,000 Construction — — — — — — — Home equity line of credit 100,000 100,000 2,000 88,000 — 107,000 — Consumer — — — — — — — $ 12,905,000 $ 13,354,000 $ 2,205,000 $ 13,110,000 $ 115,000 $ 13,112,000 $ 52,000 Total Commercial Real estate $ 8,908,000 $ 9,237,000 $ 270,000 $ 8,485,000 $ 177,000 $ 8,918,000 $ 84,000 Construction 1,027,000 1,027,000 — 789,000 21,000 837,000 11,000 Other 9,439,000 9,737,000 1,647,000 9,463,000 17,000 9,442,000 11,000 Municipal — — — — — — — Residential Term 11,774,000 13,186,000 286,000 11,698,000 199,000 11,728,000 104,000 Construction — — — — — — — Home equity line of credit 1,028,000 1,121,000 2,000 1,092,000 9,000 1,025,000 4,000 Consumer 16,000 29,000 — 16,000 — 16,000 — $ 32,192,000 $ 34,337,000 $ 2,205,000 $ 31,543,000 $ 423,000 $ 31,966,000 $ 214,000 Substantially all interest income recognized on impaired loans for all classes of financing receivables was recognized on a cash basis as received. A breakdown of impaired loans by class of financing receivable as of and for the year ended December 31, 2017 is presented in the following table: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 3,791,000 $ 3,996,000 $ — $ 5,124,000 $ 164,000 Construction 741,000 741,000 — 62,000 38,000 Other 2,591,000 2,671,000 — 1,908,000 36,000 Municipal — — — — — Residential Term 9,769,000 10,909,000 — 10,770,000 297,000 Construction — — — — — Home equity line of credit 1,115,000 1,429,000 — 1,351,000 18,000 Consumer 16,000 29,000 — 12,000 — $ 18,023,000 $ 19,775,000 $ — $ 19,227,000 $ 553,000 With an Allowance Recorded Commercial Real estate $ 3,999,000 $ 4,116,000 $ 224,000 $ 4,460,000 $ 152,000 Construction — — — 699,000 — Other 7,327,000 7,371,000 1,309,000 2,584,000 — Municipal — — — — — Residential Term 1,979,000 2,144,000 255,000 2,106,000 79,000 Construction — — — — — Home equity line of credit 64,000 67,000 24,000 32,000 — Consumer — — — — — $ 13,369,000 $ 13,698,000 $ 1,812,000 $ 9,881,000 $ 231,000 Total Commercial Real estate $ 7,790,000 $ 8,112,000 $ 224,000 $ 9,584,000 $ 316,000 Construction 741,000 741,000 — 761,000 38,000 Other 9,918,000 10,042,000 1,309,000 4,492,000 36,000 Municipal — — — — — Residential Term 11,748,000 13,053,000 255,000 12,876,000 376,000 Construction — — — — — Home equity line of credit 1,179,000 1,496,000 24,000 1,383,000 18,000 Consumer 16,000 29,000 — 12,000 — $ 31,392,000 $ 33,473,000 $ 1,812,000 $ 29,108,000 $ 784,000 A breakdown of impaired loans by class of financing receivable as of and for the period ended June 30, 2017 is presented in the following table: For the six months ended June 30, 2017 For the quarter ended June 30, 2017 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 5,686,000 $ 6,171,000 $ — $ 5,429,000 $ 94,000 $ 5,414,000 $ 46,000 Construction — — — — — — — Other 1,405,000 1,449,000 — 1,507,000 19,000 1,418,000 12,000 Municipal — — — — — — — Residential Term 11,065,000 12,152,000 — 11,343,000 161,000 11,283,000 73,000 Construction — — — — — — — Home equity line of credit 1,380,000 1,731,000 — 1,387,000 14,000 1,397,000 7,000 Consumer — — — — — — — $ 19,536,000 $ 21,503,000 $ — $ 19,666,000 $ 288,000 $ 19,512,000 $ 138,000 With an Allowance Recorded Commercial Real estate $ 4,167,000 $ 4,356,000 $ 221,000 $ 4,644,000 $ 85,000 $ 4,549,000 $ 43,000 Construction 763,000 763,000 103,000 763,000 18,000 763,000 9,000 Other 228,000 268,000 36,000 177,000 6,000 230,000 4,000 Municipal — — — — — — — Residential Term 1,925,000 2,067,000 209,000 1,971,000 41,000 1,864,000 21,000 Construction — — — — — — — Home equity line of credit 25,000 27,000 25,000 26,000 — 25,000 — Consumer — — — — — — — $ 7,108,000 $ 7,481,000 $ 594,000 $ 7,581,000 $ 150,000 $ 7,431,000 $ 77,000 Total Commercial Real estate $ 9,853,000 $ 10,527,000 $ 221,000 $ 10,073,000 $ 179,000 $ 9,963,000 $ 89,000 Construction 763,000 763,000 103,000 763,000 18,000 763,000 9,000 Other 1,633,000 1,717,000 36,000 1,684,000 25,000 1,648,000 16,000 Municipal — — — — — — — Residential Term 12,990,000 14,219,000 209,000 13,314,000 202,000 13,147,000 94,000 Construction — — — — — — — Home equity line of credit 1,405,000 1,758,000 25,000 1,413,000 14,000 1,422,000 7,000 Consumer — — — — — — — $ 26,644,000 $ 28,984,000 $ 594,000 $ 27,247,000 $ 438,000 $ 26,943,000 $ 215,000 Troubled Debt Restructured A "TDR" constitutes a restructuring of debt if the Company, for economic or legal reasons related to the borrower's financial difficulties, grants a concession to the borrower that it would not otherwise consider. To determine whether or not a loan should be classified as a TDR, Management evaluates a loan based upon the following criteria: • The borrower demonstrates financial difficulty; common indicators include past due status with bank obligations, substandard credit bureau reports, or an inability to refinance with another lender, and • The Company has granted a concession; common concession types include maturity date extension, interest rate adjustments to below market pricing, and deferment of payments. As of June 30, 2018 , the Company had 72 loans with a balance of $25,606,000 that have been classified as TDRs. This compares to 62 loans with a balance of $17,801,000 and 68 loans with a balance of $20,301,000 classified as TDRs as of December 31, 2017 and June 30, 2017 , respectively. The impairment carried as a specific reserve in the allowance for loan losses is calculated by present valuing the expected cash flows on the loan at the original interest rate, or, for collateral-dependent loans, using the fair value of the collateral less costs to sell. The following table shows TDRs by class and the specific reserve as of June 30, 2018 : Number of Loans Balance Specific Reserves Commercial Real estate 15 $ 8,026,000 $ 143,000 Construction 1 741,000 — Other 5 7,071,000 1,100,000 Municipal — — — Residential Term 48 9,263,000 287,000 Construction — — — Home equity line of credit 3 505,000 — Consumer — — — 72 $ 25,606,000 $ 1,530,000 The following table shows TDRs by class and the specific reserve as of December 31, 2017 : Number of Loans Balance Specific Reserves Commercial Real estate 8 $ 7,038,000 $ 90,000 Construction 1 741,000 — Other 4 561,000 — Municipal — — — Residential Term 46 8,948,000 233,000 Construction — — — Home equity line of credit 3 513,000 — Consumer — — — 62 $ 17,801,000 $ 323,000 The following table shows TDRs by class and the specific reserve as of June 30, 2017 : Number of Loans Balance Specific Reserves Commercial Real estate 9 $ 8,040,000 $ 93,000 Construction 1 763,000 103,000 Other 5 749,000 1,000 Municipal — — — Residential Term 50 10,227,000 209,000 Construction — — — Home equity line of credit 3 522,000 — Consumer — — — 68 $ 20,301,000 $ 406,000 As of June 30, 2018 , eight of the loans classified as TDRs with a total balance of $893,000 were more than 30 days past due. None of these loans had been placed on TDR status in the previous 12 months. The following table shows these TDRs by class and the associated specific reserves included in the allowance for loan losses as of June 30, 2018 : Number of Loans Balance Specific Reserves Commercial Real estate — $ — $ — Construction — — — Other — — — Municipal — — — Residential Term 7 726,000 33,000 Construction — — — Home equity line of credit 1 167,000 — Consumer — — — 8 $ 893,000 $ 33,000 As of June 30, 2017 , 10 of the loans classified as TDRs with a total balance of $1,336,000 were more than 30 days past due. Of these loans, none had been placed on TDR status in the previous 12 months. The following table shows these TDRs by class and the associated specific reserves included in the allowance for loan losses as of June 30, 2017 : Number of Loans Balance Specific Reserves Commercial Real estate — $ — $ — Construction — — — Other — — — Municipal — — — Residential Term 9 1,169,000 10,000 Construction — — — Home equity line of credit 1 167,000 — Consumer — — — 10 $ 1,336,000 $ 10,000 For the six months ended June 30, 2018 , 10 loans were placed on TDR status. The following table shows these TDRs by class and the associated specific reserves included in the allowance for loan losses as of June 30, 2018 : Number of Loans Pre-Modification Post-Modification Outstanding Specific Reserves Commercial Real estate 7 $ 1,056,000 $ 1,056,000 $ 42,000 Construction — — — — Other 1 6,727,000 6,532,000 1,100,000 Municipal — — — — Residential Term 2 441,000 436,000 26,000 Construction — — — — Home equity line of credit — — — — Consumer — — — — 10 $ 8,224,000 $ 8,024,000 $ 1,168,000 For the quarter ended June 30, 2018 , three loans were placed on TDR status. The following table shows these TDRs by class and the associated specific reserves included in the allowance for loan losses as of June 30, 2018 : Number of Loans Pre-Modification Post-Modification Outstanding Specific Reserves Commercial Real estate — $ — $ — $ — Construction — — — — Other 1 6,727,000 6,532,000 1,100,000 Municipal — — — — Residential Term 2 441,000 436,000 26,000 Construction — — — — Home equity line of credit — — — — Consumer — — — — 3 $ 7,168,000 $ 6,968,000 $ 1,126,000 For the six months and quarter ended June 30, 2017, no loans were placed on TDR status. As of June 30, 2018 , Management is aware of four loans classified as TDRs that are involved in bankruptcy with an outstanding balance of $681,000 . There were also twelve loans with an outstanding balance of $7,795,000 that were classified as TDRs and on non-accrual status, of which four loans with an outstanding balance of $504,000 were in the process of foreclosure. Residential Mortgage Loans in Process of Foreclosure As of June 30, 2018 , there were 14 mortgage loans collateralized by residential real estate in the process of foreclosure with a total balance of $ 1,524,000 . This compares to 12 mortgage loans collateralized by residential real estate in the process of foreclosure with a total balance of $1,919,000 as of June 30, 2017 .

Allowance for Loan Losses

Allowance for Loan Losses	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Allowance for Loan Losses	Allowance for Loan Losses The Company provides for loan losses through the establishment of an allowance for loan losses which represents an estimated reserve for existing losses in the loan portfolio. A systematic methodology is used for determining the allowance that includes a quarterly review process, risk rating changes, and adjustments to the allowance. The loan portfolio is classified in eight classes and credit risk is evaluated separately in each class. Major risk characteristics relevant to each portfolio segment are as follows: Commercial Real Estate - Commercial real estate loans are impacted by factors such as competitive market forces, vacancy rates, cap rates, net operating incomes, lease renewals and overall economic demand. In addition, loans in the recreational and tourism sector can be affected by weather conditions, such as unseasonably low winter snowfalls. Commercial real estate lending also carries a higher degree of environmental risk than other real estate lending. Commercial Construction - Commercial construction loans are impacted by factors similar to those for commercial real estate loans in addition to risks related to contractor financial capacity and ability to complete a project within acceptable time frames and within budget. Commercial Other - A weakened economy, soft consumer spending, and the rising cost of labor or raw materials are examples of issues that can impact the credit quality in this segment. Municipal Loans - The overall health of the economy, including unemployment rates and housing prices, has an impact on the credit quality of this segment. Residential Real Estate Term - The overall health of the economy, including unemployment rates and housing prices, has an impact on the credit quality of this segment. Residential Real Estate Construction - Residential construction are impacted by factors similar to those for residential real estate term in addition to risks related to contractor financial capacity and ability to complete a project within acceptable time frames and within budget. Home Equity Line of Credit - The overall health of the economy, including unemployment rates and housing prices, has an impact on the credit quality of this segment. Consumer - The overall health of the economy, including unemployment rates, has an impact on the credit quality of this segment. The appropriate level of the allowance is evaluated continually based on a review of significant loans, with a particular emphasis on nonaccruing, past due, and other loans that may require special attention. Other factors include general conditions in local and national economies; loan portfolio composition and asset quality indicators; and internal factors such as changes in underwriting policies, credit administration practices, experience, ability and depth of lending management, among others. The allowance consists of four elements: (1) specific reserves for loans evaluated individually for impairment; (2) general reserves for each portfolio segment based on historical loan loss experience, (3) qualitative reserves judgmentally adjusted for local and national economic conditions, concentrations, portfolio composition, volume and severity of delinquencies and nonaccrual loans, trends of criticized and classified loans, changes in credit policies and underwriting standards, credit administration practices, and other factors as applicable for each portfolio segment; and (4) unallocated reserves. All outstanding loans are considered in evaluating the appropriateness of the allowance. A breakdown of the allowance for loan losses as of June 30, 2018 , December 31, 2017 , and June 30, 2017 , by class of financing receivable and allowance element, is presented in the following tables: As of June 30, 2018 Specific Reserves on Loans Evaluated Individually for Impairment General Reserves on Loans Based on Historical Loss Experience Reserves for Qualitative Factors Unallocated Reserves Total Reserves Commercial Real estate $ 270,000 $ 1,067,000 $ 2,395,000 $ — $ 3,732,000 Construction — 123,000 276,000 — 399,000 Other 1,647,000 563,000 1,265,000 — 3,475,000 Municipal — — 21,000 — 21,000 Residential Term 286,000 311,000 541,000 — 1,138,000 Construction — 10,000 19,000 — 29,000 Home equity line of credit 2,000 287,000 389,000 — 678,000 Consumer — 269,000 306,000 — 575,000 Unallocated — — — 1,425,000 1,425,000 $ 2,205,000 $ 2,630,000 $ 5,212,000 $ 1,425,000 $ 11,472,000 As of December 31, 2017 Specific Reserves on Loans Evaluated Individually for Impairment General Reserves on Loans Based on Historical Loss Experience Reserves for Qualitative Factors Unallocated Reserves Total Reserves Commercial Real estate $ 224,000 $ 1,285,000 $ 2,363,000 $ — $ 3,872,000 Construction — 153,000 281,000 — 434,000 Other 1,309,000 723,000 1,326,000 — 3,358,000 Municipal — — 20,000 — 20,000 Residential Term 255,000 311,000 564,000 — 1,130,000 Construction — 13,000 23,000 — 36,000 Home equity line of credit 24,000 297,000 371,000 — 692,000 Consumer — 251,000 294,000 — 545,000 Unallocated — — — 642,000 642,000 $ 1,812,000 $ 3,033,000 $ 5,242,000 $ 642,000 $ 10,729,000 As of June 30, 2017 Specific Reserves on Loans Evaluated Individually for Impairment General Reserves on Loans Based on Historical Loss Experience Reserves for Qualitative Factors Unallocated Reserves Total Reserves Commercial Real estate $ 221,000 $ 1,467,000 $ 2,308,000 $ — $ 3,996,000 Construction 103,000 161,000 253,000 — 517,000 Other 36,000 829,000 1,306,000 — 2,171,000 Municipal — — 19,000 — 19,000 Residential Term 209,000 249,000 541,000 — 999,000 Construction — 8,000 18,000 — 26,000 Home equity line of credit 25,000 300,000 359,000 — 684,000 Consumer — 245,000 284,000 — 529,000 Unallocated — — — 1,670,000 1,670,000 $ 594,000 $ 3,259,000 $ 5,088,000 $ 1,670,000 $ 10,611,000 Qualitative adjustment factors are taken into consideration when determining reserve estimates. These adjustment factors are based upon Management's evaluation of various current conditions, including those listed below. • General economic conditions. • Credit quality trends with emphasis on loan delinquencies, nonaccrual levels and classified loans. • Recent loss experience in particular segments of the portfolio. • Loan volumes and concentrations, including changes in mix. • Other factors, including changes in quality of the loan origination; loan policy changes; changes in credit risk management processes; Bank regulatory and external loan review examination results. The qualitative portion of the allowance for loan losses was 0.43% of related loans as of June 30, 2018 , compared to 0.45% of related loans as of December 31, 2017 . The qualitative portion declined nominally, or $30,000 between December 31, 2017 and June 30, 2018 due to a mix of factors. The unallocated component of the allowance totaled $1,425,000 at June 30, 2018 , or 12.4% of the total reserve. This compares to $642,000 or 6.0% as of December 31, 2017 . The change supported general imprecision related to portfolio growth. The allowance for loan losses as a percent of total loans stood at 0.94% as of June 30, 2018 , compared to 0.92% as of December 31, 2017 and 0.95% as of June 30, 2017 . Commercial loans are comprised of three major classes, commercial real estate loans, commercial construction loans and other commercial loans. Commercial real estate loans consist of mortgage loans to finance investments in real property such as multi-family residential, commercial/retail, office, industrial, hotels, educational and other specific or mixed use properties. Commercial real estate loans are typically written with amortizing payment structures. Collateral values are determined based on appraisals and evaluations in accordance with established policy and regulatory guidelines. Commercial real estate loans typically have a loan-to-value ratio of up to 80% based upon current valuation information at the time the loan is made. Commercial real estate loans are primarily paid by the cash flow generated from the real property, such as operating leases, rents, or other operating cash flows from the borrower. Commercial construction loans consist of loans to finance construction in a mix of owner- and non-owner occupied commercial real estate properties. Commercial construction loans typically have maturities of less than two years. Payment structures during the construction period are typically on an interest only basis, although principal payments may be established depending on the type of construction project being financed. During the construction phase, commercial construction loans are primarily paid by cash flow generated from the construction project or other operating cash flows from the borrower or guarantors, if applicable. At the end of the construction period, loan repayment typically comes from a third party source in the event that the Company will not be providing permanent term financing. Collateral valuation and loan-to-value guidelines follow those for commercial real estate loans. Other commercial loans consist of revolving and term loan obligations extended to business and corporate enterprises for the purpose of financing working capital and or capital investment. Collateral generally consists of pledges of business assets including, but not limited to, accounts receivable, inventory, plant and equipment, and/or real estate, if applicable. Commercial loans are primarily paid by the operating cash flow of the borrower. Commercial loans may be secured or unsecured. Municipal loans are comprised of loans to municipalities in Maine for capitalized expenditures, construction projects or tax anticipation notes. All municipal loans are considered general obligations of the municipality and are collateralized by the taxing ability of the municipality for repayment of debt. Residential loans are comprised of two classes: term loans and construction loans. Residential term loans consist of residential real estate loans held in the Company's loan portfolio made to borrowers who demonstrate the ability to make scheduled payments with full consideration to underwriting factors. Borrower qualifications include favorable credit history combined with supportive income requirements and loan-to-value ratios within established policy and regulatory guidelines. Collateral values are determined based on appraisals and evaluations in accordance with established policy and regulatory guidelines. Residential loans typically have a loan-to-value ratio of up to 80% based on appraisal information at the time the loan is made. Collateral consists of mortgage liens on one- to four-family residential properties. Loans are offered with fixed or adjustable rates with amortization terms of up to thirty years. Residential construction loans typically consist of loans for the purpose of constructing single family residences to be owned and occupied by the borrower. Borrower qualifications include favorable credit history combined with supportive income requirements and loan-to-value ratios within established policy and regulatory guidelines. Residential construction loans normally have construction terms of one year or less and payment during the construction term is typically on an interest only basis from sources including interest reserves, borrower liquidity and/or income. Residential construction loans will typically convert to permanent financing from the Company or have another financing commitment in place from an acceptable mortgage lender. Collateral valuation and loan-to-value guidelines are consistent with those for residential term loans. Home equity lines of credit are made to qualified individuals and are secured by senior or junior mortgage liens on owner occupied one- to four-family homes, condominiums, or vacation homes. The home equity line of credit typically has a variable interest rate and is billed as interest-only payments during the draw period. At the end of the draw period, the home equity line of credit is billed as a percentage of the principal balance plus all accrued interest. Loan maturities are normally 300 months. Borrower qualifications include favorable credit history combined with supportive income requirements and combined loan-to- value ratios usually not exceeding 80% inclusive of priority liens. Collateral valuation guidelines follow those for residential real state loans. Consumer loan products including personal lines of credit and amortizing loans made to qualified individuals for various purposes such as auto, recreational vehicles, debt consolidation, personal expenses or overdraft protection. Borrower qualifications include favorable credit history combined with supportive income and collateral requirements within established policy guidelines. Consumer loans may be secured or unsecured. Construction, land and land development loans, both commercial and residential, comprise a small portion of the portfolio, and at 32.5% of capital are below the regulatory guidance limit of 100.0% of capital at June 30, 2018 . Construction loans and non-owner-occupied commercial real estate loans are at 129.9% of total capital, below the regulatory limit of 300.0% of capital at June 30, 2018 . The process of establishing the allowance with respect to the commercial loan portfolio begins when a Loan Officer or Senior Officer (or designate) initially assigns each loan a risk rating, using established credit criteria. Approximately 60% of a trailing four quarter average gross commercial portfolio is subject to review and validation annually by an independent consulting firm. Additionally, commercial loan relationships with exposure greater than or equal to $500,000 and lines of credit greater than $250,000 are subject to review annually by the Company's internal credit review function. The methodology employs Management's judgment as to the level of losses on existing loans based on internal review of the loan portfolio, including an analysis of a borrower's current financial position, and the consideration of current and anticipated economic conditions and their potential effects on specific borrowers and or lines of business. In determining the Company's ability to collect certain loans, Management also considers the fair value of underlying collateral. The risk rating system has eight levels, defined as follows: 1 Strong Credits rated "1" are characterized by borrowers fully responsible for the credit with excellent capacity to pay principal and interest. Loans rated "1" may be secured with acceptable forms of liquid collateral. 2 Above Average Credits rated "2" are characterized by borrowers that have better than average liquidity, capitalization, earnings and/or cash flow with a consistent record of solid financial performance. 3 Satisfactory Credits rated "3" are characterized by borrowers with favorable liquidity, profitability and financial condition with adequate cash flow to pay debt service. 4 Average Credits rated "4" are characterized by borrowers that present risk more than 1, 2 and 3 rated loans and merit an ordinary level of ongoing monitoring. Financial condition is on par or somewhat below industry averages while cash flow is generally adequate to meet debt service requirements. 5 Watch Credits rated "5" are characterized by borrowers that warrant greater monitoring due to financial condition or unresolved and identified risk factors. 6 Other Assets Especially Mentioned (OAEM) Loans in this category are currently protected but are potentially weak and constitute an undue and unwarranted credit risk, but not to the point of justifying a classification of substandard. OAEM have potential weaknesses which may, if not checked or corrected, weaken the asset or inadequately protect the Company's credit position at some future date. 7 Substandard Loans in this category are inadequately protected by the paying capacity of the borrower or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. Substandard loans are characterized by the distinct possibility that the Company may sustain some loss if the deficiencies are not corrected. 8 Doubtful Loans classified "Doubtful" have the same weaknesses as those classified substandard with the added characteristic that the weaknesses make collection or liquidation in full, based on currently existing facts, conditions, and values, highly questionable and improbable. The possibility of loss is high, but because of certain important and reasonably specific pending factors which may work to the advantage and strengthening of the asset, its classification as an estimated loss is deferred until its more exact status may be determined. The following table summarizes the risk ratings for the Company's commercial real estate, commercial construction, commercial other, and municipal loans as of June 30, 2018 : Commercial Real Estate Commercial Construction Commercial Other Municipal Loans All Risk- Rated Loans 1 Strong $ — $ — $ 1,404,000 $ — $ 1,404,000 2 Above Average 12,404,000 39,000 5,500,000 44,997,000 62,940,000 3 Satisfactory 73,164,000 3,027,000 40,950,000 603,000 117,744,000 4 Average 195,119,000 18,081,000 81,255,000 3,117,000 297,572,000 5 Watch 50,088,000 18,875,000 38,705,000 — 107,668,000 6 OAEM 1,410,000 — 1,373,000 — 2,783,000 7 Substandard 17,806,000 286,000 15,531,000 — 33,623,000 8 Doubtful 123,000 — — — 123,000 Total $ 350,114,000 $ 40,308,000 $ 184,718,000 $ 48,717,000 $ 623,857,000 The following table summarizes the risk ratings for the Company's commercial real estate, commercial construction, commercial other, and municipal loans as of December 31, 2017 : Commercial Real Estate Commercial Construction Commercial Other Municipal Loans All Risk- Rated Loans 1 Strong $ — $ — $ 1,586,000 $ — $ 1,586,000 2 Above Average 12,534,000 40,000 5,776,000 32,673,000 51,023,000 3 Satisfactory 73,899,000 2,856,000 38,151,000 718,000 115,624,000 4 Average 173,956,000 22,446,000 84,360,000 — 280,762,000 5 Watch 41,652,000 12,714,000 33,934,000 — 88,300,000 6 OAEM 3,442,000 — 2,765,000 — 6,207,000 7 Substandard 18,203,000 — 14,956,000 — 33,159,000 8 Doubtful 123,000 — — — 123,000 Total $ 323,809,000 $ 38,056,000 $ 181,528,000 $ 33,391,000 $ 576,784,000 The following table summarizes the risk ratings for the Company's commercial real estate, commercial construction, commercial other, and municipal loans as of June 30, 2017 : Commercial Real Estate Commercial Construction Commercial Other Municipal Loans All Risk- Rated Loans 1 Strong $ 2,000 $ — $ 1,004,000 $ — $ 1,006,000 2 Above Average 13,737,000 45,000 7,700,000 27,895,000 49,377,000 3 Satisfactory 84,550,000 2,827,000 52,024,000 800,000 140,201,000 4 Average 140,826,000 20,849,000 80,537,000 — 242,212,000 5 Watch 46,158,000 9,884,000 16,402,000 — 72,444,000 6 OAEM 3,283,000 — 3,920,000 — 7,203,000 7 Substandard 17,811,000 — 12,104,000 — 29,915,000 8 Doubtful 123,000 — — — 123,000 Total $ 306,490,000 $ 33,605,000 $ 173,691,000 $ 28,695,000 $ 542,481,000 Commercial loans are generally charged off when all or a portion of the principal amount is determined to be uncollectible. This determination is based on circumstances specific to a borrower including repayment ability, analysis of collateral and other factors as applicable. Residential loans are comprised of two classes: term loans, which include traditional amortizing home mortgages, and construction loans, which include loans for owner-occupied residential construction. Residential loans typically have a 75% to 80% loan to value based upon current appraisal information at the time the loan is made. Home equity loans and lines of credit are typically written to the same underwriting standards. Consumer loans are primarily amortizing loans to individuals collateralized by automobiles, pleasure craft and recreation vehicles, typically with a maximum loan to value of 80% to 90% of the purchase price of the collateral. Consumer loans also include a small amount of unsecured short-term time notes to individuals. Residential loans, consumer loans and home equity lines of credit are segregated into homogeneous pools with similar risk characteristics. Trends and current conditions are analyzed and historical loss experience is adjusted accordingly. Quantitative and qualitative adjustment factors for these segments are consistent with those for the commercial and municipal classes. Certain loans in the residential, home equity lines of credit and consumer classes identified as having the potential for further deterioration are analyzed individually to confirm impairment status, and to determine the need for a specific reserve; however there is no formal rating system used for these classes. Consumer loans greater than 120 days past due are generally charged off. Residential loans 90 days or more past due are placed on non-accrual status unless the loans are both well secured and in the process of collection. One- to four-family residential real estate loans and home equity loans are written down or charged-off no later than 180 days past due, or for residential real estate secured loans having a borrower in bankruptcy, within 60 days of receipt of notification of filing from the bankruptcy court, whichever is sooner. This is subject to completion of a current assessment of the value of the collateral with any outstanding loan balance in excess of the fair value of the property, less costs to sell, written down or charged-off. There were no changes to the Company's accounting policies or methodology used to estimate the allowance for loan losses during the six months ended June 30, 2018 . The following table presents allowance for loan losses activity by class for the six months and quarter ended June 30, 2018 , and allowance for loan loss balances by class and related loan balances by class as of June 30, 2018 : Commercial Municipal Residential Home Equity Line of Credit Consumer Unallocated Total Real Estate Construction Other Term Construction For the six months ended June 30, 2018 Beginning balance $ 3,872,000 $ 434,000 $ 3,358,000 $ 20,000 $ 1,130,000 $ 36,000 $ 692,000 $ 545,000 $ 642,000 $ 10,729,000 Charge offs — — 17,000 — 96,000 — 115,000 145,000 — 373,000 Recoveries — — 10,000 — 42,000 — 13,000 51,000 — 116,000 Provision (credit) (140,000 ) (35,000 ) 124,000 1,000 62,000 (7,000 ) 88,000 124,000 783,000 1,000,000 Ending balance $ 3,732,000 $ 399,000 $ 3,475,000 $ 21,000 $ 1,138,000 $ 29,000 $ 678,000 $ 575,000 $ 1,425,000 $ 11,472,000 For the three months ended June 30, 2018 Beginning balance $ 3,732,000 $ 396,000 $ 3,540,000 $ 21,000 $ 1,129,000 $ 31,000 $ 716,000 $ 581,000 $ 811,000 $ 10,957,000 Charge offs — — — — 15,000 — — 40,000 — 55,000 Recoveries — — 4,000 — 38,000 — 2,000 26,000 — 70,000 Provision (credit) — 3,000 (69,000 ) — (14,000 ) (2,000 ) (40,000 ) 8,000 614,000 500,000 Ending balance $ 3,732,000 $ 399,000 $ 3,475,000 $ 21,000 $ 1,138,000 $ 29,000 $ 678,000 $ 575,000 $ 1,425,000 $ 11,472,000 Allowance for loan losses as of June 30, 2018 Ending balance specifically evaluated for impairment $ 270,000 $ — $ 1,647,000 $ — $ 286,000 $ — $ 2,000 $ — $ — $ 2,205,000 Ending balance collectively evaluated for impairment $ 3,462,000 $ 399,000 $ 1,828,000 $ 21,000 $ 852,000 $ 29,000 $ 676,000 $ 575,000 $ 1,425,000 $ 9,267,000 Related loan balances as of June 30, 2018 Ending balance $ 350,114,000 $ 40,308,000 $ 184,718,000 $ 48,717,000 $ 453,588,000 $ 14,583,000 $ 107,666,000 $ 24,746,000 $ — $ 1,224,440,000 Ending balance specifically evaluated for impairment $ 8,908,000 $ 1,027,000 $ 9,439,000 $ — $ 11,774,000 $ — $ 1,028,000 $ 16,000 $ — $ 32,192,000 Ending balance collectively evaluated for impairment $ 341,206,000 $ 39,281,000 $ 175,279,000 $ 48,717,000 $ 441,814,000 $ 14,583,000 $ 106,638,000 $ 24,730,000 $ — $ 1,192,248,000 The following table presents allowance for loan losses activity by class for the year ended December 31, 2017 and allowance for loan loss balances by class and related loan balances by class as of December 31, 2017 : Commercial Municipal Residential Home Equity Line of Credit Consumer Unallocated Total Real Estate Construction Other Term Construction Beginning balance $ 3,988,000 $ 396,000 $ 1,780,000 $ 18,000 $ 1,288,000 $ 44,000 $ 807,000 $ 559,000 $ 1,258,000 $ 10,138,000 Charge offs 587,000 — 212,000 — 456,000 — 28,000 335,000 — 1,618,000 Recoveries — — 49,000 — 40,000 — 11,000 109,000 — 209,000 Provision (credit) 471,000 38,000 1,741,000 2,000 258,000 (8,000 ) (98,000 ) 212,000 (616,000 ) 2,000,000 Ending balance $ 3,872,000 $ 434,000 $ 3,358,000 $ 20,000 $ 1,130,000 $ 36,000 $ 692,000 $ 545,000 $ 642,000 $ 10,729,000 Ending balance specifically evaluated for impairment $ 224,000 $ — $ 1,309,000 $ — $ 255,000 $ — $ 24,000 $ — $ — $ 1,812,000 Ending balance collectively evaluated for impairment $ 3,648,000 $ 434,000 $ 2,049,000 $ 20,000 $ 875,000 $ 36,000 $ 668,000 $ 545,000 $ 642,000 $ 8,917,000 Ending balance $ 323,809,000 $ 38,056,000 $ 181,528,000 $ 33,391,000 $ 432,661,000 $ 17,868,000 $ 111,302,000 $ 25,524,000 $ — $ 1,164,139,000 Ending balance specifically evaluated for impairment $ 7,790,000 $ 741,000 $ 9,918,000 $ — $ 11,748,000 $ — $ 1,179,000 $ 16,000 $ — $ 31,392,000 Ending balance collectively evaluated for impairment $ 316,019,000 $ 37,315,000 $ 171,610,000 $ 33,391,000 $ 420,913,000 $ 17,868,000 $ 110,123,000 $ 25,508,000 $ — $ 1,132,747,000 The following table presents allowance for loan losses activity by class for the six months and quarter ended June 30, 2017 , and allowance for loan loss balances by class and related loan balances by class as of June 30, 2017 : Commercial Municipal Residential Home Equity Line of Credit Consumer Unallocated Total Real Estate Construction Other Term Construction For the six months ended June 30, 2017 Beginning balance $ 3,988,000 $ 396,000 $ 1,780,000 $ 18,000 $ 1,288,000 $ 44,000 $ 807,000 $ 559,000 $ 1,258,000 $ 10,138,000 Charge offs 305,000 — 58,000 — 70,000 — 28,000 156,000 — 617,000 Recoveries — — 18,000 — 19,000 — 3,000 50,000 — 90,000 Provision (credit) 313,000 121,000 431,000 1,000 (238,000 ) (18,000 ) (98,000 ) 76,000 412,000 1,000,000 Ending balance $ 3,996,000 $ 517,000 $ 2,171,000 $ 19,000 $ 999,000 $ 26,000 $ 684,000 $ 529,000 $ 1,670,000 $ 10,611,000 For the three months ended June 30, 2017 Beginning balance $ 4,015,000 $ 441,000 $ 1,925,000 $ 18,000 $ 969,000 $ 24,000 $ 811,000 $ 573,000 $ 1,591,000 $ 10,367,000 Charge offs 141,000 — 58,000 — 17,000 — 21,000 53,000 — 290,000 Recoveries — — 7,000 — 5,000 — 3,000 19,000 — 34,000 Provision (credit) 122,000 76,000 297,000 1,000 42,000 2,000 (109,000 ) (10,000 ) 79,000 500,000 Ending balance $ 3,996,000 $ 517,000 $ 2,171,000 $ 19,000 $ 999,000 $ 26,000 $ 684,000 $ 529,000 $ 1,670,000 $ 10,611,000 Allowance for loan losses as of June 30, 2017 Ending balance specifically evaluated for impairment $ 221,000 $ 103,000 $ 36,000 $ — $ 209,000 $ — $ 25,000 $ — $ — $ 594,000 Ending balance collectively evaluated for impairment $ 3,775,000 $ 414,000 $ 2,135,000 $ 19,000 $ 790,000 $ 26,000 $ 659,000 $ 529,000 $ 1,670,000 $ 10,017,000 Related loan balances as of June 30, 2017 Ending balance $ 306,490,000 $ 33,605,000 $ 173,691,000 $ 28,695,000 $ 427,171,000 $ 15,056,000 $ 110,328,000 $ 25,629,000 $ — $ 1,120,665,000 Ending balance specifically evaluated for impairment $ 9,853,000 $ 763,000 $ 1,633,000 $ — $ 12,990,000 $ — $ 1,405,000 $ — $ — $ 26,644,000 Ending balance collectively evaluated for impairment $ 296,637,000 $ 32,842,000 $ 172,058,000 $ 28,695,000 $ 414,181,000 $ 15,056,000 $ 108,923,000 $ 25,629,000 $ — $ 1,094,021,000

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation At the 2010 Annual Meeting, shareholders approved the 2010 Equity Incentive Plan (the "2010 Plan"). This reserves 400,000 shares of common stock for issuance in connection with stock options, restricted stock awards and other equity based awards to attract and retain the best available personnel, provide additional incentive to officers, employees and non-employee Directors and promote the success of our business. Such grants and awards will be structured in a manner that does not encourage the recipients to expose the Company to undue or inappropriate risk. Options issued under the 2010 Plan will qualify for treatment as incentive stock options for purposes of Section 422 of the Internal Revenue Code. Other compensation under the 2010 Plan will qualify as performance-based for purposes of Section 162(m) of the Internal Revenue Code, and will satisfy NASDAQ guidelines relating to equity compensation. As of June 30, 2018 , 144,355 shares of restricted stock had been granted under the 2010 Plan, of which 67,689 shares remain restricted as of June 30, 2018 as detailed in the following table: Year Granted Vesting Term (In Years) Shares Remaining Term (In Years) 2014 5.0 10,422 0.6 2015 5.0 12,023 1.6 2016 5.0 15,015 2.5 2017 3.0 4,902 1.6 2017 5.0 9,972 3.5 2018 1.0 300 0.6 2018 2.0 932 1.5 2018 3.0 2,400 2.6 2018 4.0 2,068 3.5 2018 5.0 9,655 4.5 67,689 2.3 The compensation cost related to these restricted stock grants is $1,489,000 and is recognized over the vesting terms of each grant. In the six months ended June 30, 2018 , $190,000 of expense was recognized for these restricted shares, leaving $869,000 in unrecognized expense as of June 30, 2018 . In the six months ended June 30, 2017 , $166,000 of expense was recognized for restricted shares, leaving $828,000 in unrecognized expense as of June 30, 2017 .

Preferred and Common Stock

Preferred and Common Stock	6 Months Ended
	Jun. 30, 2018
Stockholders' Equity Note [Abstract]
Preferred and Common Stock	Preferred and Common Stock Preferred Stock On January 9, 2009, the Company issued $25,000,000 in Fixed Rate Cumulative Perpetual Preferred Stock, Series A, to the U.S. Treasury ("Treasury') under the Capital Purchase Program ("the CPP Shares"). The CPP Shares qualified as Tier 1 capital on the Company's books for regulatory purposes and ranked senior to the Company's common stock and senior or at an equal level in the Company's capital structure to any other shares of preferred stock the Company may issue in the future. In three separate transactions in 2012 and 2013, the Company repurchased all of the CPP shares from the Treasury. Incident to such issuance of the CPP shares, the Company issued to the Treasury warrants (the "Warrants") to purchase up to 225,904 shares of the Company's common stock at a price per share of $16.60 (subject to adjustment). The Warrants (and any shares of common stock issuable pursuant to the Warrants) are freely transferable by the Treasury to third parties. The Warrants have a term of ten years and could be exercised by the Treasury or a subsequent holder at any time or from time to time during their term. To the extent they had not previously been exercised, the Warrants will expire after ten years . The Warrants were unchanged as a result of the CPP Shares repurchase transactions. In May 2015, the Treasury sold the Warrants to private parties. In accordance with the contractual terms of the Warrants, the number of shares issuable upon exercise and strike price were adjusted at the time of the sale. As a result of this transaction, the aggregate number of shares of common stock issuable under the Warrants were adjusted to 226,819 shares with a strike price of $16.53 per share. In November 2016, the Company repurchased all of the outstanding Warrants for an aggregate purchase price of $1,750,000 . Common Stock Proceeds from sale of common stock totaled $310,000 and $329,000 for the six months ended June 30, 2018 and 2017 , respectively.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table sets forth the computation of basic and diluted earnings per share (EPS) for the six months ended June 30, 2018 and 2017 : Income (Numerator) Shares (Denominator) Per-Share Amount For the six months ended June 30, 2018 Net income as reported $ 11,240,000 Basic EPS: Income available to common shareholders 11,240,000 10,776,680 $ 1.04 Effect of dilutive securities: restricted stock 70,443 Diluted EPS: Income available to common shareholders plus assumed conversions $ 11,240,000 10,847,123 $ 1.04 For the six months ended June 30, 2017 Net income as reported $ 9,520,000 Basic EPS: Income available to common shareholders 9,520,000 10,740,355 $ 0.89 Effect of dilutive securities: restricted stock 72,348 Diluted EPS: Income available to common shareholders plus assumed conversions $ 9,520,000 10,812,703 $ 0.88 The following table sets forth the computation of basic diluted EPS for the quarters ended June 30, 2018 and 2017: Income (Numerator) Shares (Denominator) Per-Share Amount For the quarter ended June 30, 2018 Net income as reported $ 5,734,000 Basic EPS: Income available to common shareholders 5,734,000 10,779,275 $ 0.53 Effect of dilutive securities: restricted stock 70,443 Diluted EPS: Income available to common shareholders plus assumed conversions $ 5,734,000 10,849,718 $ 0.53 For the quarter ended June 30, 2017 Net income as reported $ 4,883,000 Basic EPS: Income available to common shareholders 4,883,000 10,746,363 $ 0.45 Effect of dilutive securities: restricted stock 71,086 Diluted EPS: Income available to common shareholders plus assumed conversions $ 4,883,000 10,817,449 $ 0.45

Employee Benefit Plans

Employee Benefit Plans	6 Months Ended
	Jun. 30, 2018
Retirement Benefits, Description [Abstract]
Employee Benefit Plans	Employee Benefit Plans 401(k) Plan The Bank has a defined contribution plan available to substantially all employees who have completed 3 months of service. Employees may contribute up to Internal Revenue Service ("IRS") determined limits and the Bank may match employee contributions not to exceed 3.0% of compensation depending on contribution level. Subject to a vote of the Board of Directors, the Bank may also make a profit-sharing contribution to the Plan. Such contribution equaled 2.0% of each eligible employee's compensation in 2017 . The amount for 2018 has not been established. The expense related to the 401(k) plan was $288,000 and $243,000 for the six months ended June 30, 2018 and 2017 , respectively. Deferred Compensation and Supplemental Retirement Benefits The Bank also provides unfunded supplemental retirement benefits for certain officers, payable in installments over 20 years upon retirement or death. The agreements consist of individual contracts with differing characteristics that, when taken together, do not constitute a postretirement plan. The costs for these benefits are recognized over the service periods of the participating officers in accordance with Financial Accounting Standards Board ("FASB") Accounting Standards Codification ("ASC") Topic 712 "Compensation – Nonretirement Postemployment Benefits". The expense of these supplemental retirement benefits was $86,000 for the six months ended June 30, 2018 and $108,000 for the the same period in 2017 . As of June 30, 2018 , the associated accrued liability included in other liabilities in the balance sheet was $3,003,000 compared to $3,060,000 and $3,042,000 at December 31, 2017 and June 30, 2017 , respectively. Post-Retirement Benefit Plans The Bank sponsors two post-retirement benefit plans. One plan currently provides a subsidy for health insurance premiums to certain retired employees and a future subsidy for six active employees who were age 50 and over in 1996. These subsidies are based on years of service and range between $40 and $1,200 per month per person. The other plan provides life insurance coverage to certain retired employees and health insurance for retired directors. None of these plans are pre-funded. The Company utilizes FASB ASC Topic 712 to recognize the overfunded or underfunded status of a defined benefit postretirement plan as an asset or liability in its balance sheet and to recognize changes in the funded status in the year in which the changes occur through comprehensive income (loss). The following table sets forth the accumulated postretirement benefit obligation and funded status: At or for the six months ended June 30, 2018 2017 Change in benefit obligation Benefit obligation at beginning of year $ 1,874,000 $ 1,870,000 Interest cost 38,000 38,000 Benefits paid (56,000 ) (64,000 ) Benefit obligation at end of period $ 1,856,000 $ 1,844,000 Funded status Benefit obligation at end of period $ (1,856,000 ) $ (1,844,000 ) Unamortized loss 186,000 102,000 Accrued benefit cost at end of period $ (1,670,000 ) $ (1,742,000 ) The following table sets forth the net periodic pension cost: For the six months ended June 30, For the quarter ended June 30, 2018 2017 2018 2017 Components of net periodic benefit cost Interest cost $ 38,000 $ 38,000 $ 19,000 $ 19,000 Net periodic benefit cost $ 38,000 $ 38,000 $ 19,000 $ 19,000 Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive income (loss) are as follows: June 30, December 31, 2017 June 30, Unamortized net actuarial loss $ (186,000 ) $ (186,000 ) $ (156,000 ) Deferred tax benefit at 21% (for June 30, 2018 and December 31, 2017) and 35% (for June 30, 2017) 39,000 39,000 54,000 Net unrecognized postretirement benefits included in accumulated other comprehensive income (loss) $ (147,000 ) $ (147,000 ) $ (102,000 ) A weighted average discount rate of 4.25% was used in determining the accumulated benefit obligation and the net periodic benefit cost. The assumed health care cost trend rate is 7.0% . The measurement date for benefit obligations was as of year-end for prior years presented. The expected benefit payments for all of 2018 are $128,000 . Plan expense for 2018 is estimated to be $77,000 . A 1% change in trend assumptions would create an approximate change in the same direction of $100,000 in the accumulated benefit obligation, $7,000 in the interest cost and $1,000 in the service cost.

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Other Comprehensive Income (Loss)	Other Comprehensive Income (Loss) The following table summarizes activity in the unrealized gain or loss on available for sale securities included in other comprehensive income (loss) for the six months and quarter ended June 30, 2018 and 2017 . For the six months ended June 30, For the quarter ended June 30, 2018 2017 2018 2017 Balance at beginning of period $ (2,901,000 ) $ (935,000 ) $ (6,210,000 ) $ (934,000 ) Unrealized gains (losses) arising during the period (5,363,000 ) 541,000 (1,311,000 ) 536,000 Reclassification of realized gains during the period (136,000 ) (3,000 ) — — Related deferred taxes (at a Federal Income Tax rate of 21% for June 30, 2018 and 35% for June 30, 2017) 1,155,000 (188,000 ) 276,000 (187,000 ) Net change (4,344,000 ) 350,000 (1,035,000 ) 349,000 Balance at end of period $ (7,245,000 ) $ (585,000 ) $ (7,245,000 ) $ (585,000 ) The reclassification of realized gains is included in the net securities gains line of the consolidated statements of income and comprehensive income and the tax effect is included in the income tax expense line of the same statement. The following table summarizes activity in the unrealized loss on securities transferred from available for sale to held to maturity included in other comprehensive income (loss) for the six months and quarter ended June 30, 2018 and 2017 . For the six months ended June 30, For the quarter ended June 30, 2018 2017 2018 2017 Balance at beginning of period $ (174,000 ) $ (129,000 ) $ (182,000 ) $ (133,000 ) Amortization of net unrealized losses (19,000 ) (12,000 ) (9,000 ) (6,000 ) Related deferred taxes (at a Federal Income Tax rate of 21% for June 30, 2018 and 35% for June 30, 2017) 4,000 4,000 2,000 2,000 Net change (15,000 ) (8,000 ) (7,000 ) (4,000 ) Balance at end of period $ (189,000 ) $ (137,000 ) $ (189,000 ) $ (137,000 ) The following table presents the effect of the Company's derivative financial instruments included in other comprehensive income (loss) for the six months and quarter ended June 30, 2018 and 2017 . For the six months ended June 30, For the quarter ended June 30, 2018 2017 2018 2017 Balance at beginning of period $ 1,544,000 $ 1,163,000 $ 1,928,000 $ 1,226,000 Unrealized gains, (losses) on cash flow hedging derivatives arising during the period 661,000 (167,000 ) 175,000 (263,000 ) Related deferred taxes (at a Federal Income Tax rate of 21% for June 30, 2018 and 35% for June 30, 2017) (139,000 ) 59,000 (37,000 ) 92,000 Net change 522,000 (108,000 ) 138,000 (171,000 ) Balance at end of period $ 2,066,000 $ 1,055,000 $ 2,066,000 $ 1,055,000 The following table summarizes activity in the unrealized gain or loss on postretirement benefits included in other comprehensive income (loss) for the six months and quarter ended June 30, 2018 and 2017 . For the six months ended June 30, For the quarter ended June 30, 2018 2017 2018 2017 Unrecognized postretirement benefits at beginning of period $ (147,000 ) $ (102,000 ) $ (147,000 ) $ (102,000 ) Amortization of unrecognized transition obligation — — — — Change in unamortized net actuarial gain (loss) — — — — Related deferred taxes (at a Federal Income Tax rate of 21% for June 30, 2018 and 35% for June 30, 2017) — — — — Unrecognized postretirement benefits at end of period $ (147,000 ) $ (102,000 ) $ (147,000 ) $ (102,000 )

Financial Derivative Instrument

Financial Derivative Instruments	6 Months Ended
	Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Derivative Instruments	Financial Derivative Instruments As part of its overall asset and liability management strategy, the Company periodically uses derivative instruments to minimize significant unplanned fluctuations in earnings and cash flows caused by interest rate volatility. The Company’s interest rate risk management strategy involves modifying the re-pricing characteristics of certain assets or liabilities so that changes in interest rates do not have a significant effect on net interest income. The Company recognizes its derivative instruments in the consolidated balance sheet at fair value. On the date the derivative instrument is entered into, the Company designates whether the derivative is part of a hedging relationship (i.e., cash flow or fair value hedge). The Company formally documents relationships between hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking hedge transactions. The Company also assesses, both at the hedge’s inception and on an ongoing basis, whether the derivatives used in hedging transactions are highly effective in offsetting the changes in cash flows or fair values of hedged items. Changes in fair value of derivative instruments that are highly effective and qualify as cash flow hedges are recorded in other comprehensive income or loss. Any ineffective portion is recorded in earnings. The Company discontinues hedge accounting when it is determined that the derivative is no longer highly effective in offsetting changes of the hedged risk on the hedged item, or management determines that the designation of the derivative as a hedging instrument is no longer appropriate. In 2016, then again in 2018, interest rate swaps were contracted to limit the Company’s exposure to rising interest rates on short-term liabilities indexed to one-month London Inter-bank Offered Rates (LIBOR). The interest rate swaps were designated as cash flow hedges. The details of the interest rate swap agreements are as follows: June 30, 2018 December 31, 2017 June 30, 2017 Notional Amount Effective Date Maturity Date Variable Index Received Fixed Rate Paid Fair Value (1) Fair Value (1) Fair Value (1) $ 30,000,000 June 28, 2016 June 28, 2021 1-Month USD LIBOR 0.940 % $ 1,521,000 $ 1,154,000 $ 952,000 20,000,000 June 27, 2016 June 27, 2021 1-Month USD LIBOR 0.893 % 1,041,000 801,000 671,000 25,000,000 June 5, 2018 December 5, 2019 1-Month USD LIBOR 2.466 % 11,000 — — 25,000,000 June 5, 2018 June 5, 2020 1-Month USD LIBOR 2.547 % 19,000 — — 25,000,000 June 5, 2018 December 5, 2020 1-Month USD LIBOR 2.603 % 24,000 — — $ 125,000,000 $ 2,616,000 $ 1,955,000 $ 1,623,000 (1) Presented within other assets in the consolidated balance sheet. The Company would reclassify unrealized gains or losses accounted for within accumulated other comprehensive income (loss) into earnings if the interest rate swaps were to become ineffective or the swaps were to terminate. In the next 12 months, the Company does not believe it will be required to reclassify any unrealized gains or losses accounted for within accumulated other comprehensive income (loss) into earnings as a result of ineffectiveness or swap termination. Amounts paid or received under the swaps are reported in interest expense in the statement of income, and in interest paid in the statement of cash flows.

Mortgage Servicing Rights

Mortgage Servicing Rights	6 Months Ended
	Jun. 30, 2018
Transfers and Servicing [Abstract]
Mortgage Servicing Rights	Mortgage Servicing Rights FASB ASC Topic 860 "Transfers and Servicing" requires all separately recognized servicing assets and servicing liabilities to be initially measured at fair value, if practicable. The Company's servicing assets and servicing liabilities are reported using the amortization method and carried at the lower of amortized cost or fair value by strata. In evaluating the carrying values of mortgage servicing rights, the Company obtains third party valuations based on loan level data including note rate, type and term of the underlying loans. The model utilizes several assumptions, the most significant of which is loan prepayments, calculated using a three -months moving average of weekly prepayment data published by the Public Securities Association (PSA) and modeled against the serviced loan portfolio, and the discount rate to discount future cash flows. As of June 30, 2018 , the prepayment assumption using the PSA model was 126 , which translates into an anticipated prepayment rate of 7.56% . The discount rate is 9.50% . Other assumptions include delinquency rates, foreclosure rates, servicing cost inflation, and annual unit loan cost. All assumptions are adjusted periodically to reflect current circumstances. Amortization of mortgage servicing rights, as well as write-offs due to prepayments of the related mortgage loans, are recorded as a charge against mortgage servicing fee income. For the six months ended June 30, 2018 and 2017 , servicing rights capitalized totaled $119,000 and $339,000 , respectively. Servicing rights amortized for the six-month periods ended June 30, 2018 and 2017 were $102,000 and $274,000 , respectively. The fair value of servicing rights was $2,581,000 , $2,321,000 and $1,888,000 at June 30, 2018 , December 31, 2017 and June 30, 2017 , respectively. The Bank serviced loans for others totaling $259,105,000 , $260,258,000 and $252,152,000 at June 30, 2018 , December 31, 2017 , and June 30, 2017 , respectively. Mortgage servicing rights are included in other assets and detailed in the following table: June 30, December 31, June 30, Mortgage servicing rights $ 5,546,000 $ 5,428,000 $ 5,199,000 Accumulated amortization (4,261,000 ) (4,160,000 ) (4,072,000 ) Impairment reserve — — (18,000 ) $ 1,285,000 $ 1,268,000 $ 1,109,000

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes FASB ASC Topic 740 "Income Taxes" defines the criteria that an individual tax position must satisfy for some or all of the benefits of that position to be recognized in a company's financial statements. Topic 740 prescribes a recognition threshold of more-likely-than-not, and a measurement attribute for all tax positions taken or expected to be taken on a tax return, in order for those tax positions to be recognized in the financial statements. The Company is currently open to audit under the statute of limitations by the IRS for the years ended December 31, 2015 through 2017.

Certificates of Deposit

Certificates of Deposit	6 Months Ended
	Jun. 30, 2018
Banking and Thrift [Abstract]
Certificates of Deposit	Certificates of Deposit The following table represents the breakdown of certificates of deposit at June 30, 2018 and 2017 , and at December 31, 2017 : June 30, 2018 December 31, 2017 June 30, 2017 Certificates of deposit < $100,000 $ 400,680,000 $ 284,066,000 $ 270,875,000 Certificates $100,000 to $250,000 204,311,000 232,759,000 212,063,000 Certificates $250,000 and over 52,400,000 42,176,000 44,556,000 $ 657,391,000 $ 559,001,000 $ 527,494,000

Reclassifications

Reclassifications	6 Months Ended
	Jun. 30, 2018
Accounting Changes and Error Corrections [Abstract]
Reclassifications	Reclassifications Certain items from the prior year were reclassified in the financial statements to conform with the current year presentation. These do not have a material impact on the consolidated balance sheet or statement of income and comprehensive income presentations.

Fair Value

Fair Value	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value	Fair Value Certain assets and liabilities are recorded at fair value to provide additional insight into the Company's quality of earnings. Some of these assets and liabilities are measured on a recurring basis while others are measured on a nonrecurring basis, with the determination based upon applicable existing accounting pronouncements. For example, securities available for sale are recorded at fair value on a recurring basis. Other assets, such as, other real estate owned and impaired loans, are recorded at fair value on a nonrecurring basis using the lower of cost or market methodology to determine impairment of individual assets. The Company groups assets and liabilities which are recorded at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. A financial instrument's level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement (with level 1 considered highest and level 3 considered lowest). A brief description of each level follows: Level 1 - Valuation is based upon quoted prices for identical instruments in active markets. Level 2 - Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market. Level 3 - Valuation is generated from model-based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates that market participants would use in pricing the asset or liability. Valuation includes use of discounted cash flow models and similar techniques. The fair value methods and assumptions for the Company's financial instruments and other assets measured at fair value are set forth below. Cash, Cash Equivalents and Interest-Bearing Deposits in Other Banks The carrying values of cash equivalents, due from banks and federal funds sold approximate their relative fair values. As such, the Company classifies these financial instruments as Level 1. Investment Securities The fair values of investment securities are estimated by independent providers using a market approach with observable inputs, including matrix pricing and recent transactions. In obtaining such valuation information from third parties, the Company has evaluated their valuation methodologies used to develop the fair values in order to determine whether the valuations are representative of an exit price in the Company's principal markets. The Company's principal markets for its securities portfolios are the secondary institutional markets, with an exit price that is predominantly reflective of bid level pricing in those markets. Fair values are calculated based on the value of one unit without regard to any premium or discount that may result from concentrations of ownership of a financial instrument, possible tax ramifications, or estimated transaction costs. If these considerations had been incorporated into the fair value estimates, the aggregate fair value could have been changed. The carrying values of restricted equity securities approximate fair values. As such, the Company classifies investment securities as Level 2. Loans Held for Sale Loans held for sale are recorded at the lower of aggregate carrying value or fair value. The fair value of mortgage loans held for sale is based on what secondary markets are currently offering for portfolios with similar characteristics. As such, the Company classifies mortgage loans held for sale as Level 2. Loans Fair values are estimated for portfolios of loans with similar financial characteristics. The fair values of performing loans are calculated by discounting scheduled cash flows through the estimated maturity using estimated market discount rates that reflect the credit and interest risk inherent in the loan. The estimates of maturity are based on the Company's historical experience with repayments for each loan classification, modified, as required, by an estimate of the effect of current economic and lending conditions, and the effects of estimated prepayments. Assumptions regarding credit risk, cash flows, and discount rates are judgmentally determined using available market information and specific borrower information. Management has made estimates of fair value using discount rates that it believes to be reasonable. However, because there is no market for many of these financial instruments, Management has no basis to determine whether the fair value presented above would be indicative of the value negotiated in an actual sale. As such, the Company classifies loans as Level 3, except for certain collateral-dependent impaired loans. Fair values of impaired loans are based on estimated cash flows and are discounted using a rate commensurate with the risk associated with the estimated cash flows, or if collateral dependent, discounted to the appraised value of the collateral as determined by reference to sale prices of similar properties, less costs to sell. As such, the Company classifies collateral dependent impaired loans for which a specific reserve results in a fair value measure as Level 2. All other impaired loans are classified as Level 3. Other Real Estate Owned Real estate acquired through foreclosure is initially recorded at fair value. The fair value of other real estate owned is based on property appraisals and an analysis of similar properties currently available. As such, the Company records other real estate owned as nonrecurring Level 2. Mortgage Servicing Rights Mortgage servicing rights represent the value associated with servicing residential mortgage loans. Servicing assets and servicing liabilities are reported using the amortization method and compared to fair value for impairment. In evaluating the fair values of mortgage servicing rights, the Company obtains third party valuations based on loan level data including note rate, type and term of the underlying loans. As such, the Company classifies mortgage servicing rights as Level 2. Accrued Interest Receivable The fair value estimate of this financial instrument approximates the carrying value as this financial instrument has a short maturity. It is the Company's policy to stop accruing interest on loans for which it is probable that the interest is not collectible. Therefore, this financial instrument has been adjusted for estimated credit loss. As such, the Company classifies accrued interest receivable as Level 2. Deposits The fair value of deposits is based on the discounted value of contractual cash flows. The discount rate is estimated using the rates currently offered for deposits of similar remaining maturities. As such, the Company classifies deposits as Level 2. The fair value estimates do not include the benefit that results from the low-cost funding provided by the deposits compared to the cost of borrowing funds in the market. If that value were considered, the fair value of the Company's net assets could increase. Borrowed Funds The fair value of borrowed funds is based on the discounted value of contractual cash flows. The discount rate is estimated using the rates currently available for borrowings of similar remaining maturities. As such, the Company classifies borrowed funds as Level 2. Derivatives The fair value of interest rate swaps is determined using inputs that are observable in the market place obtained from third parties including yield curves, publicly available volatilities, and floating indexes and, accordingly, are classified as Level 2 inputs. The credit value adjustments associated with derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by the Company and its counterparties. As of June 30, 2018 and 2017 , and December 31, 2017 , the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of its derivative positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivatives due to collateral postings. Accrued Interest Payable The fair value estimate approximates the carrying amount as this financial instrument has a short maturity. The Company classifies accrued interest payable as Level 2. Off-Balance-Sheet Instruments Off-balance-sheet instruments include loan commitments. Fair values for loan commitments have not been presented as the future revenue derived from such financial instruments is not significant. Limitations Fair value estimates are made at a specific point in time, based on relevant market information and information about the financial instrument. These values do not reflect any premium or discount that could result from offering for sale at one time the Company's entire holdings of a particular financial instrument. Because no market exists for a significant portion of the Company's financial instruments, fair value estimates are based on Management's judgments regarding future expected loss experience, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in assumptions could significantly affect the estimates. Fair value estimates are based on existing on- and off-balance-sheet financial instruments without attempting to estimate the value of anticipated future business and the value of assets and liabilities that are not considered financial instruments. Other significant assets and liabilities that are not considered financial instruments include the deferred tax asset, premises and equipment, and other real estate owned. In addition, tax ramifications related to the realization of the unrealized gains and losses can have a significant effect on fair value estimates and have not been considered in any of the estimates. Assets Recorded at Fair Value on a Recurring Basis The following tables present the balances of assets that were measured at fair value on a recurring basis as of June 30, 2018 , December 31, 2017 and June 30, 2017 . At June 30, 2018 Level 1 Level 2 Level 3 Total Securities available for sale Mortgage-backed securities $ — $ 297,378,000 $ — $ 297,378,000 State and political subdivisions — 4,692,000 — 4,692,000 Other equity securities — 2,978,000 — 2,978,000 Total securities available for sale — 305,048,000 — 305,048,000 Interest rate swap agreements — 2,616,000 — 2,616,000 Total assets $ — $ 307,664,000 $ — $ 307,664,000 At December 31, 2017 Level 1 Level 2 Level 3 Total Securities available for sale Mortgage-backed securities $ — $ 289,989,000 $ — $ 289,989,000 State and political subdivisions — 6,769,000 — 6,769,000 Other equity securities — 3,414,000 — 3,414,000 Total securities available for sale — 300,172,000 — 300,172,000 Interest rate swap agreements — 1,955,000 — 1,955,000 Total assets $ — $ 302,127,000 $ — $ 302,127,000 At June 30, 2017 Level 1 Level 2 Level 3 Total Securities available for sale Mortgage-backed securities $ — $ 288,991,000 $ — $ 288,991,000 State and political subdivisions — 15,828,000 — 15,828,000 Other equity securities — 3,327,000 — 3,327,000 Total securities available for sale — 308,146,000 — 308,146,000 Interest rate swap agreements — 1,623,000 — 1,623,000 Total assets $ — $ 309,769,000 $ — $ 309,769,000 Assets Recorded at Fair Value on a Non-Recurring Basis The following tables include assets measured at fair value on a nonrecurring basis that have had a fair value adjustment since their initial recognition. Other real estate owned is presented net of an allowance of $53,000 and $39,000 at December 31, 2017 , and June 30, 2017 , respectively. There was no allowance at June 30, 2018. Only collateral-dependent impaired loans with a related specific allowance for loan losses or a partial charge off are included in impaired loans for purposes of fair value disclosures. Impaired loans below are presented net of specific allowances of $1,893,000 , $1,531,000 and $202,000 at June 30, 2018 , December 31, 2017 , and June 30, 2017 , respectively. At June 30, 2018 Level 1 Level 2 Level 3 Total Other real estate owned $ — $ 609,000 $ — $ 609,000 Impaired loans — 6,387,000 — 6,387,000 Total assets $ — $ 6,996,000 $ — $ 6,996,000 At December 31, 2017 Level 1 Level 2 Level 3 Total Other real estate owned $ — $ 1,012,000 $ — $ 1,012,000 Impaired loans — 6,521,000 — 6,521,000 Total assets $ — $ 7,533,000 $ — $ 7,533,000 At June 30, 2017 Level 1 Level 2 Level 3 Total Other real estate owned $ — $ 324,000 $ — $ 324,000 Impaired loans — 269,000 — 269,000 Total assets $ — $ 593,000 $ — $ 593,000 Fair Value of Financial Instruments FASB ASC Topic 825 "Financial Instruments" requires disclosures of fair value information about financial instruments, whether or not recognized in the balance sheet, if the fair values can be reasonably determined. Fair value is best determined based upon quoted market prices. However, in many instances, there are no quoted market prices for the Company's various financial instruments. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques using observable inputs when available. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the instrument. Topic 825 excludes certain financial instruments and all nonfinancial instruments from its disclosure requirements. Accordingly, the aggregate fair value amounts presented may not necessarily represent the underlying fair value of the Company. The carrying amount and estimated fair values for financial instruments as of June 30, 2018 were as follows: Carrying value Estimated fair value Level 1 Level 2 Level 3 Financial assets Cash and cash equivalents $ 21,056,000 $ 21,056,000 $ 21,056,000 $ — $ — Interest bearing deposits in other banks 1,616,000 1,616,000 1,616,000 — — Securities available for sale 305,048,000 305,048,000 — 305,048,000 — Securities to be held to maturity 260,077,000 256,316,000 — 256,316,000 — Restricted equity securities 12,363,000 12,363,000 — 12,363,000 — Loans held for sale 481,000 481,000 — 481,000 — Loans (net of allowance for loan losses) Commercial Real estate 345,853,000 338,784,000 — 423,000 338,361,000 Construction 39,852,000 39,037,000 — — 39,037,000 Other 180,750,000 178,904,000 — 5,527,000 173,377,000 Municipal 48,693,000 47,790,000 — — 47,790,000 Residential Term 452,289,000 441,029,000 — 339,000 440,690,000 Construction 14,550,000 14,443,000 — — 14,443,000 Home equity line of credit 106,892,000 105,264,000 — 98,000 105,166,000 Consumer 24,089,000 23,322,000 — — 23,322,000 Total loans 1,212,968,000 1,188,573,000 — 6,387,000 1,182,186,000 Mortgage servicing rights 1,285,000 2,581,000 — 2,581,000 — Interest rate swap agreements 2,616,000 2,616,000 — 2,616,000 — Accrued interest receivable 7,723,000 7,723,000 — 7,723,000 — Financial liabilities Demand deposits $ 146,964,000 $ 136,167,000 $ — $ 136,167,000 $ — NOW deposits 282,449,000 254,619,000 — 254,619,000 — Money market deposits 100,378,000 93,978,000 — 93,978,000 — Savings deposits 229,464,000 194,141,000 — 194,141,000 — Local certificates of deposit 267,932,000 263,342,000 — 263,342,000 — National certificates of deposit 389,459,000 389,062,000 — 389,062,000 — Total deposits 1,416,646,000 1,331,309,000 — 1,331,309,000 — Repurchase agreements 91,764,000 88,560,000 — 88,560,000 — Federal Home Loan Bank advances 205,691,000 204,476,000 — 204,476,000 — Total borrowed funds 297,455,000 293,036,000 — 293,036,000 — Accrued interest payable 943,000 943,000 — 943,000 — The carrying amounts and estimated fair values for financial instruments as of December 31, 2017 were as follows: Carrying value Estimated fair value Level 1 Level 2 Level 3 Financial assets Cash and cash equivalents $ 19,207,000 $ 19,207,000 $ 19,207,000 $ — $ — Interest bearing deposits in other banks 860,000 860,000 860,000 — — Securities available for sale 300,172,000 300,172,000 — 300,172,000 — Securities to be held to maturity 256,567,000 259,655,000 — 259,655,000 — Restricted equity securities 10,358,000 10,358,000 — 10,358,000 — Loans held for sale 386,000 386,000 — 386,000 — Loans (net of allowance for loan losses) Commercial Real estate 319,691,000 311,321,000 — 72,000 311,249,000 Construction 37,594,000 36,610,000 — — 36,610,000 Other 177,956,000 175,455,000 — 6,018,000 169,437,000 Municipal 33,370,000 33,280,000 — — 33,280,000 Residential Term 431,459,000 431,028,000 — 391,000 430,637,000 Construction 17,830,000 17,613,000 — — 17,613,000 Home equity line of credit 110,566,000 109,012,000 — 40,000 108,972,000 Consumer 24,944,000 24,408,000 — — 24,408,000 Total loans 1,153,410,000 1,138,727,000 — 6,521,000 1,132,206,000 Mortgage servicing rights 1,268,000 2,321,000 — 2,321,000 — Interest rate swap agreements 1,955,000 1,955,000 — 1,955,000 — Accrued interest receivable 5,867,000 5,867,000 — 5,867,000 — Financial liabilities Demand deposits $ 145,332,000 $ 139,350,000 $ — $ 139,350,000 $ — NOW deposits 318,043,000 295,775,000 — 295,775,000 — Money market deposits 163,898,000 153,497,000 — 153,497,000 — Savings deposits 232,605,000 203,799,000 — 203,799,000 — Local certificates of deposit 223,074,000 220,734,000 — 220,734,000 — National certificates of deposit 335,927,000 335,775,000 — 335,775,000 — Total deposits 1,418,879,000 1,348,930,000 — 1,348,930,000 — Repurchase agreements 70,564,000 67,976,000 — 67,976,000 — Federal Home Loan Bank advances 158,194,000 156,396,000 — 156,396,000 — Total borrowed funds 228,758,000 224,372,000 — 224,372,000 — Accrued interest payable 642,000 642,000 — 642,000 — The carrying amount and estimated fair values for financial instruments as of June 30, 2017 were as follows: Carrying value Estimated fair value Level 1 Level 2 Level 3 Financial assets Cash and cash equivalents $ 20,189,000 $ 20,189,000 $ 20,189,000 $ — $ — Interest bearing deposits in other banks 3,820,000 3,820,000 3,820,000 — — Securities available for sale 308,146,000 308,146,000 — 308,146,000 — Securities to be held to maturity 244,123,000 246,238,000 — 246,238,000 — Restricted equity securities 12,311,000 12,311,000 — 12,311,000 — Loans held for sale 865,000 865,000 — 865,000 — Loans (net of allowance for loan losses) Commercial Real estate 301,722,000 295,339,000 — — 295,339,000 Construction 32,989,000 32,291,000 — — 32,291,000 Other 171,099,000 169,509,000 — 33,000 169,476,000 Municipal 28,672,000 28,902,000 — — 28,902,000 Residential Term 425,985,000 428,556,000 — 236,000 428,320,000 Construction 15,025,000 14,983,000 — — 14,983,000 Home equity line of credit 109,516,000 107,855,000 — — 107,855,000 Consumer 25,046,000 24,654,000 — — 24,654,000 Total loans 1,110,054,000 1,102,089,000 — 269,000 1,101,820,000 Mortgage servicing rights 1,109,000 1,888,000 — 1,888,000 — Interest rate swap agreements 1,623,000 1,623,000 — 1,623,000 — Accrued interest receivable 7,192,000 7,192,000 — 7,192,000 — Financial liabilities Demand deposits $ 137,061,000 $ 133,002,000 $ — $ 133,002,000 $ — NOW deposits 293,553,000 274,476,000 — 274,476,000 — Money market deposits 134,760,000 126,402,000 — 126,402,000 — Savings deposits 226,391,000 200,712,000 — 200,712,000 — Local certificates of deposit 217,495,000 217,021,000 — 217,021,000 — National certificates of deposit 309,999,000 309,853,000 — 309,853,000 — Total deposits 1,319,259,000 1,261,466,000 — 1,261,466,000 — Repurchase agreements 67,154,000 64,852,000 — 64,852,000 — Federal Home Loan Bank advances 215,123,000 214,893,000 — 214,893,000 — Total borrowed funds 282,277,000 279,745,000 — 279,745,000 — Accrued interest payable 603,000 603,000 — 603,000 —

Impact of Recently Issued Accou

Impact of Recently Issued Accounting Standards	6 Months Ended
	Jun. 30, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Impact of Recently Issued Accounting Standards	Impact of Recently Issued Accounting Standards The FASB issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers, in 2014 to replace the current plethora of industry-specific rules with a broad, principles-based framework for recognizing and measuring revenue. Due to the complexity of the new pronouncement and the anticipated effort required by entities in many industries to implement ASU No. 2014-09, FASB delayed the effective date. Public business entities, certain not-for-profit entities, and certain employee benefit plans should apply the guidance to annual reporting periods beginning after December 15, 2017, and all other entities should apply the guidance to annual reporting periods beginning after December 15, 2018. FASB formed a Transition Resource Group to assist it in identifying implementation issues that may require further clarification or amendment to ASU No. 2014-09. As a result of that group’s deliberations, FASB has issued the following amendments, which will be effective concurrently with ASU No. 2014-09: ASU No. 2016-08, Principal versus Agent Considerations, which clarifies whether an entity should record the gross amount of revenue or only its ultimate share when a third party is also involved in providing goods or services to a customer; ASU No. 2016-10, Identifying Performance Obligations and Licensing, which clarifies and simplifies the process for determining whether performance obligations to a customer should be segregated and accounted for individually, and clarifies how the new revenue rules apply to licenses of intellectual property; and ASU No. 2016-12, Narrow-Scope Improvements and Practical Expedients, which clarifies and simplifies the process of assessing collectability of consideration under a contract, presentation of sales taxes, accounting for noncash consideration received, and certain transitional issues. The new standard does not apply to revenue associated with financial instruments, including loans and securities that are accounted for under other U.S. GAAP. The Company has reviewed its various other revenue streams and concluded that the new standard will have minimal impact upon its consolidated financial statements. Adoption of ASU No. 2014-09 was made on January 1, 2018 utilizing the modified retrospective approach. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities. The ASU was issued to enhance the reporting model for financial instruments to provide users of financial statements with more decision-useful information. This ASU changes how entities account for equity investments that do not result in consolidation and are not accounted for under the equity method of accounting. The ASU also changes certain disclosure requirements and other aspects of U.S. GAAP, including a requirement for public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes. The ASU became effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The adoption of the ASU did not have a material effect on the Company's consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The ASU was issued to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The ASU is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2018. Management is reviewing the guidance in the ASU to determine whether it will have a material effect on the Company’s consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. Under the new guidance, which will replace the existing incurred loss model for recognizing credit losses, banks and other lending institutions will be required to recognize the full amount of expected credit losses. The new guidance, which is referred to as the current expected credit loss model, requires that expected credit losses for financial assets held at the reporting date that are accounted for at amortized cost be measured and recognized based on historical experience and current and reasonably supportable forecasted conditions to reflect the full amount of expected credit losses. A modified version of these requirements also applies to debt securities classified as available for sale. The ASU is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for fiscal years beginning after December 15, 2018, including interim periods within such years. The Company is currently evaluating the impact of the adoption of the ASU on its consolidated financial statements, and anticipates it may have a material impact. The Bank has formed an implementation committee for ASU No. 2016-13. To date, committee members have participated in educational seminars on the new standards, begun the process of identifying the historical data sets that will be necessary to implement the new standard, and have chosen a third-party vendor who provides software solutions for ASU No. 2016-13 modeling and calculation. Implementation of this software is in process. In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The ASU was issued to reduce the cost and complexity of the goodwill impairment test. To simplify the subsequent measurement of goodwill, step two of the goodwill impairment test was eliminated. Instead, a Company will recognize an impairment of goodwill should the carrying value of a reporting unit exceed its fair value (i.e. step one). The ASU will be effective for the Company on January 1, 2020 and will be applied prospectively. The Company does not expect the implementation to have a material effect on the Company's consolidated financial statements. In March 2017, the FASB issued ASU No. 2017-08, Premium Amortization on Purchased Callable Debt Securities. This ASU shortens the amortization period for the premium on certain purchased callable debt securities to the earliest call date. Today, many entities amortize the premium over the contractual life of the security. The new guidance does not change the accounting for purchased callable debt securities held at a discount; the discount continues to be accreted to maturity. The ASU is effective for interim and annual reporting periods beginning after December 15, 2018; early adoption is permitted. The guidance calls for a modified retrospective transition approach under which a cumulative-effect adjustment will be made to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. The Company's current practice aligns with the ASU therefore Management believes there will be no impact on the Company's consolidated financial statements. In May 2017, the FASB issued ASU No. 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting. The ASU was issued to provide clarity and reduce both 1) diversity in practice and 2) cost and complexity when applying the guidance in Topic 718, Compensation-Stock Compensation, to a change to the terms or conditions of a shared-based payment award. The ASU includes guidance on determining which changes to the terms and conditions of share-based payment awards require and entity to apply modification accounting under Topic 718. The ASU is effective for the annual period, and interim periods within the annual periods, beginning after December 15, 2017. Early adoption is permitted, including adoption in any interim period. The ASU should be applied prospectively to an award modified on or after the adoption date. Adoption of the ASU did not have a material effect on the Company's consolidated financial statements. In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815). The amendments in this ASU improve the financial reporting of hedging relationships to better portray the economic results of an entity's risk management activities in its financial statements. In addition, this ASU makes certain targeted improvements to simplify the application of the hedge accounting guidance in current US GAAP. The amendments in this ASU are effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early application is permitted in any interim period after issuance of the ASU. Management is reviewing the guidance in this ASU to determine whether it will have a material effect on the Company's consolidated financial statements. In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (Loss). This ASU was issued to allow a reclassification from accumulated other comprehensive income (loss) to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. Consequently, the amendments eliminate the stranded tax effects resulting from the Tax Cuts and Jobs Act and will improve the usefulness of information reported to financial statement users. However, because the amendments only relate to the reclassification of the income tax effects of the Tax Cuts and Jobs Act, the underlying guidance that requires that the effect of a change in tax laws or rates be included in income from continuing operations is not affected. The ASU is effective for fiscal years beginning after December 15, 2018, with early adoption permitted for financial statements which have not yet been issued. The Company adopted the ASU for the December 31, 2017 consolidated financial statements, which resulted in a reclassification adjustment on the Consolidated Statements of Changes in Shareholders' Equity of $297,000 from accumulated other comprehensive income (loss) to retained earnings. Refer to Note 9, Income Taxes, in the Company's December 31, 2017 Form 10-K for additional information.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Financial Derivative Instruments	As part of its overall asset and liability management strategy, the Company periodically uses derivative instruments to minimize significant unplanned fluctuations in earnings and cash flows caused by interest rate volatility. The Company’s interest rate risk management strategy involves modifying the re-pricing characteristics of certain assets or liabilities so that changes in interest rates do not have a significant effect on net interest income. The Company recognizes its derivative instruments in the consolidated balance sheet at fair value. On the date the derivative instrument is entered into, the Company designates whether the derivative is part of a hedging relationship (i.e., cash flow or fair value hedge). The Company formally documents relationships between hedging instruments and hedged items, as well as its risk management objective and strategy for undertaking hedge transactions. The Company also assesses, both at the hedge’s inception and on an ongoing basis, whether the derivatives used in hedging transactions are highly effective in offsetting the changes in cash flows or fair values of hedged items. Changes in fair value of derivative instruments that are highly effective and qualify as cash flow hedges are recorded in other comprehensive income or loss. Any ineffective portion is recorded in earnings. The Company discontinues hedge accounting when it is determined that the derivative is no longer highly effective in offsetting changes of the hedged risk on the hedged item, or management determines that the designation of the derivative as a hedging instrument is no longer appropriate. In 2016, then again in 2018, interest rate swaps were contracted to limit the Company’s exposure to rising interest rates on short-term liabilities indexed to one-month London Inter-bank Offered Rates (LIBOR). The interest rate swaps were designated as cash flow hedges.
Reclassifications	Certain items from the prior year were reclassified in the financial statements to conform with the current year presentation. These do not have a material impact on the consolidated balance sheet or statement of income and comprehensive income presentations.
Fair Value	Certain assets and liabilities are recorded at fair value to provide additional insight into the Company's quality of earnings. Some of these assets and liabilities are measured on a recurring basis while others are measured on a nonrecurring basis, with the determination based upon applicable existing accounting pronouncements. For example, securities available for sale are recorded at fair value on a recurring basis. Other assets, such as, other real estate owned and impaired loans, are recorded at fair value on a nonrecurring basis using the lower of cost or market methodology to determine impairment of individual assets. The Company groups assets and liabilities which are recorded at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. A financial instrument's level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement (with level 1 considered highest and level 3 considered lowest). A brief description of each level follows: Level 1 - Valuation is based upon quoted prices for identical instruments in active markets. Level 2 - Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market. Level 3 - Valuation is generated from model-based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates that market participants would use in pricing the asset or liability. Valuation includes use of discounted cash flow models and similar techniques.
Fair Value of Financial Instruments	Fair Value of Financial Instruments FASB ASC Topic 825 "Financial Instruments" requires disclosures of fair value information about financial instruments, whether or not recognized in the balance sheet, if the fair values can be reasonably determined. Fair value is best determined based upon quoted market prices. However, in many instances, there are no quoted market prices for the Company's various financial instruments. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques using observable inputs when available. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. Accordingly, the fair value estimates may not be realized in an immediate settlement of the instrument. Topic 825 excludes certain financial instruments and all nonfinancial instruments from its disclosure requirements. Accordingly, the aggregate fair value amounts presented may not necessarily represent the underlying fair value of the Company.
Impact of Recently Issued Accounting Standards	Impact of Recently Issued Accounting Standards The FASB issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers, in 2014 to replace the current plethora of industry-specific rules with a broad, principles-based framework for recognizing and measuring revenue. Due to the complexity of the new pronouncement and the anticipated effort required by entities in many industries to implement ASU No. 2014-09, FASB delayed the effective date. Public business entities, certain not-for-profit entities, and certain employee benefit plans should apply the guidance to annual reporting periods beginning after December 15, 2017, and all other entities should apply the guidance to annual reporting periods beginning after December 15, 2018. FASB formed a Transition Resource Group to assist it in identifying implementation issues that may require further clarification or amendment to ASU No. 2014-09. As a result of that group’s deliberations, FASB has issued the following amendments, which will be effective concurrently with ASU No. 2014-09: ASU No. 2016-08, Principal versus Agent Considerations, which clarifies whether an entity should record the gross amount of revenue or only its ultimate share when a third party is also involved in providing goods or services to a customer; ASU No. 2016-10, Identifying Performance Obligations and Licensing, which clarifies and simplifies the process for determining whether performance obligations to a customer should be segregated and accounted for individually, and clarifies how the new revenue rules apply to licenses of intellectual property; and ASU No. 2016-12, Narrow-Scope Improvements and Practical Expedients, which clarifies and simplifies the process of assessing collectability of consideration under a contract, presentation of sales taxes, accounting for noncash consideration received, and certain transitional issues. The new standard does not apply to revenue associated with financial instruments, including loans and securities that are accounted for under other U.S. GAAP. The Company has reviewed its various other revenue streams and concluded that the new standard will have minimal impact upon its consolidated financial statements. Adoption of ASU No. 2014-09 was made on January 1, 2018 utilizing the modified retrospective approach. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments - Overall: Recognition and Measurement of Financial Assets and Financial Liabilities. The ASU was issued to enhance the reporting model for financial instruments to provide users of financial statements with more decision-useful information. This ASU changes how entities account for equity investments that do not result in consolidation and are not accounted for under the equity method of accounting. The ASU also changes certain disclosure requirements and other aspects of U.S. GAAP, including a requirement for public business entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes. The ASU became effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The adoption of the ASU did not have a material effect on the Company's consolidated financial statements. In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The ASU was issued to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The ASU is effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2018. Management is reviewing the guidance in the ASU to determine whether it will have a material effect on the Company’s consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. Under the new guidance, which will replace the existing incurred loss model for recognizing credit losses, banks and other lending institutions will be required to recognize the full amount of expected credit losses. The new guidance, which is referred to as the current expected credit loss model, requires that expected credit losses for financial assets held at the reporting date that are accounted for at amortized cost be measured and recognized based on historical experience and current and reasonably supportable forecasted conditions to reflect the full amount of expected credit losses. A modified version of these requirements also applies to debt securities classified as available for sale. The ASU is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted for fiscal years beginning after December 15, 2018, including interim periods within such years. The Company is currently evaluating the impact of the adoption of the ASU on its consolidated financial statements, and anticipates it may have a material impact. The Bank has formed an implementation committee for ASU No. 2016-13. To date, committee members have participated in educational seminars on the new standards, begun the process of identifying the historical data sets that will be necessary to implement the new standard, and have chosen a third-party vendor who provides software solutions for ASU No. 2016-13 modeling and calculation. Implementation of this software is in process. In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The ASU was issued to reduce the cost and complexity of the goodwill impairment test. To simplify the subsequent measurement of goodwill, step two of the goodwill impairment test was eliminated. Instead, a Company will recognize an impairment of goodwill should the carrying value of a reporting unit exceed its fair value (i.e. step one). The ASU will be effective for the Company on January 1, 2020 and will be applied prospectively. The Company does not expect the implementation to have a material effect on the Company's consolidated financial statements. In March 2017, the FASB issued ASU No. 2017-08, Premium Amortization on Purchased Callable Debt Securities. This ASU shortens the amortization period for the premium on certain purchased callable debt securities to the earliest call date. Today, many entities amortize the premium over the contractual life of the security. The new guidance does not change the accounting for purchased callable debt securities held at a discount; the discount continues to be accreted to maturity. The ASU is effective for interim and annual reporting periods beginning after December 15, 2018; early adoption is permitted. The guidance calls for a modified retrospective transition approach under which a cumulative-effect adjustment will be made to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. The Company's current practice aligns with the ASU therefore Management believes there will be no impact on the Company's consolidated financial statements. In May 2017, the FASB issued ASU No. 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting. The ASU was issued to provide clarity and reduce both 1) diversity in practice and 2) cost and complexity when applying the guidance in Topic 718, Compensation-Stock Compensation, to a change to the terms or conditions of a shared-based payment award. The ASU includes guidance on determining which changes to the terms and conditions of share-based payment awards require and entity to apply modification accounting under Topic 718. The ASU is effective for the annual period, and interim periods within the annual periods, beginning after December 15, 2017. Early adoption is permitted, including adoption in any interim period. The ASU should be applied prospectively to an award modified on or after the adoption date. Adoption of the ASU did not have a material effect on the Company's consolidated financial statements. In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815). The amendments in this ASU improve the financial reporting of hedging relationships to better portray the economic results of an entity's risk management activities in its financial statements. In addition, this ASU makes certain targeted improvements to simplify the application of the hedge accounting guidance in current US GAAP. The amendments in this ASU are effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early application is permitted in any interim period after issuance of the ASU. Management is reviewing the guidance in this ASU to determine whether it will have a material effect on the Company's consolidated financial statements. In February 2018, the FASB issued ASU No. 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (Loss). This ASU was issued to allow a reclassification from accumulated other comprehensive income (loss) to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act. Consequently, the amendments eliminate the stranded tax effects resulting from the Tax Cuts and Jobs Act and will improve the usefulness of information reported to financial statement users. However, because the amendments only relate to the reclassification of the income tax effects of the Tax Cuts and Jobs Act, the underlying guidance that requires that the effect of a change in tax laws or rates be included in income from continuing operations is not affected. The ASU is effective for fiscal years beginning after December 15, 2018, with early adoption permitted for financial statements which have not yet been issued. The Company adopted the ASU for the December 31, 2017 consolidated financial statements, which resulted in a reclassification adjustment on the Consolidated Statements of Changes in Shareholders' Equity of $297,000 from accumulated other comprehensive income (loss) to retained earnings. Refer to Note 9, Income Taxes, in the Company's December 31, 2017 Form 10-K for additional information.

Investment Securities (Tables)

Investment Securities (Tables)	6 Months Ended
	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Schedule of Available For Sale, Held-to-Maturity, and Restricted Equity Securities	The following table summarizes the amortized cost and estimated fair value of investment securities at June 30, 2018 : Amortized Cost Unrealized Gains Unrealized Losses Fair Value (Estimated) Securities available for sale Mortgage-backed securities $ 306,286,000 $ 144,000 $ (9,052,000 ) $ 297,378,000 State and political subdivisions 4,955,000 $ — (263,000 ) 4,692,000 Other equity securities 2,978,000 — — 2,978,000 $ 314,219,000 $ 144,000 $ (9,315,000 ) $ 305,048,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 11,155,000 $ — $ (584,000 ) $ 10,571,000 Mortgage-backed securities 20,585,000 404,000 (365,000 ) 20,624,000 State and political subdivisions 224,037,000 1,274,000 (4,490,000 ) 220,821,000 Corporate securities 4,300,000 — — 4,300,000 $ 260,077,000 $ 1,678,000 $ (5,439,000 ) $ 256,316,000 Restricted equity securities Federal Home Loan Bank Stock $ 11,326,000 $ — $ — $ 11,326,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 12,363,000 $ — $ — $ 12,363,000 The following table summarizes the amortized cost and estimated fair value of investment securities at December 31, 2017 : Amortized Cost Unrealized Gains Unrealized Losses Fair Value (Estimated) Securities available for sale Mortgage-backed securities $ 293,689,000 $ 722,000 $ (4,422,000 ) $ 289,989,000 State and political subdivisions 6,860,000 16,000 (107,000 ) 6,769,000 Other equity securities 3,296,000 121,000 (3,000 ) 3,414,000 $ 303,845,000 $ 859,000 $ (4,532,000 ) $ 300,172,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 11,155,000 $ — $ (180,000 ) $ 10,975,000 Mortgage-backed securities 23,284,000 568,000 (128,000 ) 23,724,000 State and political subdivisions 217,828,000 3,931,000 (1,103,000 ) 220,656,000 Corporate securities 4,300,000 — — 4,300,000 $ 256,567,000 $ 4,499,000 $ (1,411,000 ) $ 259,655,000 Restricted equity securities Federal Home Loan Bank Stock $ 9,321,000 $ — $ — $ 9,321,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 10,358,000 $ — $ — $ 10,358,000 The following table summarizes the amortized cost and estimated fair value of investment securities at June 30, 2017 : Amortized Cost Unrealized Gains Unrealized Losses Fair Value (Estimated) Securities available for sale Mortgage-backed securities $ 290,379,000 $ 1,381,000 $ (2,769,000 ) $ 288,991,000 State and political subdivisions 15,401,000 486,000 (59,000 ) 15,828,000 Other equity securities 3,266,000 65,000 (4,000 ) 3,327,000 $ 309,046,000 $ 1,932,000 $ (2,832,000 ) $ 308,146,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 11,152,000 $ — $ (181,000 ) $ 10,971,000 Mortgage-backed securities 27,224,000 820,000 (41,000 ) 28,003,000 State and political subdivisions 201,447,000 3,573,000 (2,056,000 ) 202,964,000 Corporate securities 4,300,000 — — 4,300,000 $ 244,123,000 $ 4,393,000 $ (2,278,000 ) $ 246,238,000 Restricted equity securities Federal Home Loan Bank Stock $ 11,274,000 $ — $ — $ 11,274,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 12,311,000 $ — $ — $ 12,311,000
Contractual Maturities of Investment Securities	The following table summarizes the contractual maturities of investment securities at June 30, 2018 : Securities available for sale Securities to be held to maturity Amortized Cost Fair Value (Estimated) Amortized Cost Fair Value (Estimated) Due in 1 year or less $ 34,000 $ 34,000 $ 1,327,000 $ 1,329,000 Due in 1 to 5 years 9,349,000 9,341,000 23,621,000 23,698,000 Due in 5 to 10 years 71,309,000 69,745,000 155,096,000 153,240,000 Due after 10 years 230,549,000 222,950,000 80,033,000 78,049,000 Equity securities 2,978,000 2,978,000 — — $ 314,219,000 $ 305,048,000 $ 260,077,000 $ 256,316,000 The following table summarizes the contractual maturities of investment securities at December 31, 2017 : Securities available for sale Securities to be held to maturity Amortized Cost Fair Value (Estimated) Amortized Cost Fair Value (Estimated) Due in 1 year or less $ 111,000 $ 112,000 $ 635,000 $ 637,000 Due in 1 to 5 years 841,000 842,000 18,059,000 18,164,000 Due in 5 to 10 years 29,003,000 29,177,000 37,182,000 37,719,000 Due after 10 years 270,594,000 266,627,000 200,691,000 203,135,000 Equity securities 3,296,000 3,414,000 — — $ 303,845,000 $ 300,172,000 $ 256,567,000 $ 259,655,000 The following table summarizes the contractual maturities of investment securities at June 30, 2017 : Securities available for sale Securities to be held to maturity Amortized Cost Fair Value (Estimated) Amortized Cost Fair Value (Estimated) Due in 1 year or less $ 26,000 $ 26,000 $ 707,000 $ 710,000 Due in 1 to 5 years 1,722,000 1,758,000 14,536,000 14,813,000 Due in 5 to 10 years 34,382,000 35,099,000 41,373,000 42,251,000 Due after 10 years 269,650,000 267,936,000 187,507,000 188,464,000 Equity securities 3,266,000 3,327,000 — — $ 309,046,000 $ 308,146,000 $ 244,123,000 $ 246,238,000
Schedule of Securities Gains and Losses	The following table shows securities gains and losses for the six months and quarters ended June 30, 2018 and 2017 : For the six months ended June 30, For the quarter ended June 30, 2018 2017 2018 2017 Proceeds from sales of securities $ 459,000 $ 3,000 $ — $ — Gross realized gains 136,000 3,000 — — Gross realized losses — — — — Net gain $ 136,000 $ 3,000 $ — $ — Related income taxes $ 29,000 $ 1,000 $ — $ —
Schedule of Securities Temporarily Impaired	Information regarding securities temporarily impaired as of June 30, 2018 is summarized below: Less than 12 months 12 months or more Total Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses U.S. Government-sponsored agencies $ 6,882,000 $ (373,000 ) $ 3,689,000 $ (211,000 ) $ 10,571,000 $ (584,000 ) Mortgage-backed securities 202,673,000 (5,660,000 ) 91,977,000 (3,757,000 ) 294,650,000 (9,417,000 ) State and political subdivisions 70,674,000 (1,728,000 ) 36,909,000 (3,025,000 ) 107,583,000 (4,753,000 ) $ 280,229,000 $ (7,761,000 ) $ 132,575,000 $ (6,993,000 ) $ 412,804,000 $ (14,754,000 ) As of December 31, 2017 , there were 241 securities with unrealized losses held in the Company's portfolio. These securities were temporarily impaired as a result of changes in interest rates reducing their fair value, of which 157 had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of December 31, 2017 is summarized below: Less than 12 months 12 months or more Total Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses U.S. Government-sponsored agencies $ 7,161,000 $ (94,000 ) $ 3,814,000 $ (86,000 ) $ 10,975,000 $ (180,000 ) Mortgage-backed securities 132,025,000 (1,857,000 ) 101,707,000 (2,693,000 ) 233,732,000 (4,550,000 ) State and political subdivisions 9,425,000 (149,000 ) 38,864,000 (1,061,000 ) 48,289,000 (1,210,000 ) Other equity securities — — 9,000 (3,000 ) 9,000 (3,000 ) $ 148,611,000 $ (2,100,000 ) $ 144,394,000 $ (3,843,000 ) $ 293,005,000 $ (5,943,000 ) As of June 30, 2017 , there were 235 securities with unrealized losses held in the Company's portfolio. These securities were temporarily impaired as a result of changes in interest rates reducing their fair value, of which 15 had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of June 30, 2017 is summarized below: Less than 12 months 12 months or more Total Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses Fair Value (Estimated) Unrealized Losses U.S. Government-sponsored agencies $ 7,972,000 $ (181,000 ) $ — $ — $ 7,972,000 $ (181,000 ) Mortgage-backed securities 170,966,000 (2,613,000 ) 7,643,000 (197,000 ) 178,609,000 (2,810,000 ) State and political subdivisions 55,952,000 (2,115,000 ) — — 55,952,000 (2,115,000 ) Other equity securities 69,000 (1,000 ) 9,000 (3,000 ) 78,000 (4,000 ) $ 234,959,000 $ (4,910,000 ) $ 7,652,000 $ (200,000 ) $ 242,611,000 $ (5,110,000 )

Loans (Tables)

Loans (Tables)	6 Months Ended
	Jun. 30, 2018
Loans and Leases Receivable Disclosure [Abstract]
Composition of Loan Portfolio	The following table shows the composition of the Company's loan portfolio as of June 30, 2018 and 2017 and at December 31, 2017 : June 30, 2018 December 31, 2017 June 30, 2017 Commercial Real estate $ 350,114,000 28.6 % $ 323,809,000 27.8 % $ 306,490,000 27.4 % Construction 40,308,000 3.3 % 38,056,000 3.3 % 33,605,000 3.0 % Other 184,718,000 15.1 % 181,528,000 15.6 % 173,691,000 15.5 % Municipal 48,717,000 4.0 % 33,391,000 2.9 % 28,695,000 2.6 % Residential Term 453,588,000 37.0 % 432,661,000 37.1 % 427,171,000 38.1 % Construction 14,583,000 1.2 % 17,868,000 1.5 % 15,056,000 1.3 % Home equity line of credit 107,666,000 8.8 % 111,302,000 9.6 % 110,328,000 9.8 % Consumer 24,746,000 2.0 % 25,524,000 2.2 % 25,629,000 2.3 % Total $ 1,224,440,000 100.0 % $ 1,164,139,000 100.0 % $ 1,120,665,000 100.0 %
Past Due Loans Aging	Information on the past-due status of loans by class of financing receivable as of June 30, 2018 , is presented in the following table: 30-59 Days Past Due 60-89 Days Past Due 90+ Days Past Due All Past Due Current Total 90+ Days & Accruing Commercial Real estate $ 137,000 $ 75,000 $ 503,000 $ 715,000 $ 349,399,000 $ 350,114,000 $ — Construction — — — — 40,308,000 40,308,000 — Other 459,000 42,000 294,000 795,000 183,923,000 184,718,000 — Municipal — — — — 48,717,000 48,717,000 — Residential Term 531,000 2,014,000 1,730,000 4,275,000 449,313,000 453,588,000 — Construction — — — — 14,583,000 14,583,000 — Home equity line of credit 915,000 38,000 575,000 1,528,000 106,138,000 107,666,000 — Consumer 70,000 37,000 18,000 125,000 24,621,000 24,746,000 3,000 Total $ 2,112,000 $ 2,206,000 $ 3,120,000 $ 7,438,000 $ 1,217,002,000 $ 1,224,440,000 $ 3,000 Information on the past-due status of loans by class of financing receivable as of December 31, 2017 , is presented in the following table: 30-59 Days Past Due 60-89 Days Past Due 90+ Days Past Due All Past Due Current Total 90+ Days & Accruing Commercial Real estate $ 574,000 $ 80,000 $ 220,000 $ 874,000 $ 322,935,000 $ 323,809,000 $ — Construction — — — — 38,056,000 38,056,000 — Other 542,000 6,663,000 574,000 7,779,000 173,749,000 181,528,000 — Municipal — — — — 33,391,000 33,391,000 — Residential Term 1,031,000 4,372,000 2,256,000 7,659,000 425,002,000 432,661,000 436,000 Construction 101,000 370,000 — 471,000 17,397,000 17,868,000 — Home equity line of credit 537,000 445,000 725,000 1,707,000 109,595,000 111,302,000 — Consumer 159,000 18,000 9,000 186,000 25,338,000 25,524,000 9,000 Total $ 2,944,000 $ 11,948,000 $ 3,784,000 $ 18,676,000 $ 1,145,463,000 $ 1,164,139,000 $ 445,000 Information on the past-due status of loans by class of financing receivable as of June 30, 2017 , is presented in the following table: 30-59 Days Past Due 60-89 Days Past Due 90+ Days Past Due All Past Due Current Total 90+ Days & Accruing Commercial Real estate $ 88,000 $ — $ 1,387,000 $ 1,475,000 $ 305,015,000 $ 306,490,000 $ — Construction — — — — 33,605,000 33,605,000 — Other 29,000 259,000 515,000 803,000 172,888,000 173,691,000 — Municipal — — — — 28,695,000 28,695,000 — Residential Term 533,000 3,343,000 1,507,000 5,383,000 421,788,000 427,171,000 — Construction 99,000 — — 99,000 14,957,000 15,056,000 — Home equity line of credit 440,000 406,000 751,000 1,597,000 108,731,000 110,328,000 — Consumer 282,000 118,000 29,000 429,000 25,200,000 25,629,000 29,000 Total $ 1,471,000 $ 4,126,000 $ 4,189,000 $ 9,786,000 $ 1,110,879,000 $ 1,120,665,000 $ 29,000
Nonaccrual Loans	Information on nonaccrual loans as of June 30, 2018 and 2017 and at December 31, 2017 is presented in the following table: June 30, 2018 December 31, 2017 June 30, 2017 Commercial Real estate $ 981,000 $ 752,000 $ 1,814,000 Construction 286,000 — — Other 8,900,000 9,357,000 885,000 Municipal — — — Residential Term 3,509,000 3,778,000 3,852,000 Construction — — — Home equity line of credit 689,000 833,000 883,000 Consumer 16,000 16,000 — Total $ 14,381,000 $ 14,736,000 $ 7,434,000
Impaired Loans by Class of Financing Receivable	A breakdown of impaired loans by class of financing receivable as of and for the period ended June 30, 2018 is presented in the following table: For the six months ended June 30, 2018 For the quarter ended June 30, 2018 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 5,438,000 $ 5,749,000 $ — $ 4,666,000 $ 110,000 $ 5,169,000 $ 56,000 Construction 1,027,000 1,027,000 — 789,000 21,000 837,000 11,000 Other 2,265,000 2,349,000 — 2,287,000 17,000 2,272,000 11,000 Municipal — — — — — — — Residential Term 9,613,000 10,808,000 — 9,671,000 151,000 9,642,000 80,000 Construction — — — — — — — Home equity line of credit 928,000 1,021,000 — 1,004,000 9,000 918,000 4,000 Consumer 16,000 29,000 — 16,000 — 16,000 — $ 19,287,000 $ 20,983,000 $ — $ 18,433,000 $ 308,000 $ 18,854,000 $ 162,000 With an Allowance Recorded Commercial Real estate $ 3,470,000 $ 3,488,000 $ 270,000 $ 3,819,000 $ 67,000 $ 3,749,000 $ 28,000 Construction — — — — — — — Other 7,174,000 7,388,000 1,647,000 7,176,000 — 7,170,000 — Municipal — — — — — — — Residential Term 2,161,000 2,378,000 286,000 2,027,000 48,000 2,086,000 24,000 Construction — — — — — — — Home equity line of credit 100,000 100,000 2,000 88,000 — 107,000 — Consumer — — — — — — — $ 12,905,000 $ 13,354,000 $ 2,205,000 $ 13,110,000 $ 115,000 $ 13,112,000 $ 52,000 Total Commercial Real estate $ 8,908,000 $ 9,237,000 $ 270,000 $ 8,485,000 $ 177,000 $ 8,918,000 $ 84,000 Construction 1,027,000 1,027,000 — 789,000 21,000 837,000 11,000 Other 9,439,000 9,737,000 1,647,000 9,463,000 17,000 9,442,000 11,000 Municipal — — — — — — — Residential Term 11,774,000 13,186,000 286,000 11,698,000 199,000 11,728,000 104,000 Construction — — — — — — — Home equity line of credit 1,028,000 1,121,000 2,000 1,092,000 9,000 1,025,000 4,000 Consumer 16,000 29,000 — 16,000 — 16,000 — $ 32,192,000 $ 34,337,000 $ 2,205,000 $ 31,543,000 $ 423,000 $ 31,966,000 $ 214,000 Substantially all interest income recognized on impaired loans for all classes of financing receivables was recognized on a cash basis as received. A breakdown of impaired loans by class of financing receivable as of and for the year ended December 31, 2017 is presented in the following table: Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 3,791,000 $ 3,996,000 $ — $ 5,124,000 $ 164,000 Construction 741,000 741,000 — 62,000 38,000 Other 2,591,000 2,671,000 — 1,908,000 36,000 Municipal — — — — — Residential Term 9,769,000 10,909,000 — 10,770,000 297,000 Construction — — — — — Home equity line of credit 1,115,000 1,429,000 — 1,351,000 18,000 Consumer 16,000 29,000 — 12,000 — $ 18,023,000 $ 19,775,000 $ — $ 19,227,000 $ 553,000 With an Allowance Recorded Commercial Real estate $ 3,999,000 $ 4,116,000 $ 224,000 $ 4,460,000 $ 152,000 Construction — — — 699,000 — Other 7,327,000 7,371,000 1,309,000 2,584,000 — Municipal — — — — — Residential Term 1,979,000 2,144,000 255,000 2,106,000 79,000 Construction — — — — — Home equity line of credit 64,000 67,000 24,000 32,000 — Consumer — — — — — $ 13,369,000 $ 13,698,000 $ 1,812,000 $ 9,881,000 $ 231,000 Total Commercial Real estate $ 7,790,000 $ 8,112,000 $ 224,000 $ 9,584,000 $ 316,000 Construction 741,000 741,000 — 761,000 38,000 Other 9,918,000 10,042,000 1,309,000 4,492,000 36,000 Municipal — — — — — Residential Term 11,748,000 13,053,000 255,000 12,876,000 376,000 Construction — — — — — Home equity line of credit 1,179,000 1,496,000 24,000 1,383,000 18,000 Consumer 16,000 29,000 — 12,000 — $ 31,392,000 $ 33,473,000 $ 1,812,000 $ 29,108,000 $ 784,000 A breakdown of impaired loans by class of financing receivable as of and for the period ended June 30, 2017 is presented in the following table: For the six months ended June 30, 2017 For the quarter ended June 30, 2017 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 5,686,000 $ 6,171,000 $ — $ 5,429,000 $ 94,000 $ 5,414,000 $ 46,000 Construction — — — — — — — Other 1,405,000 1,449,000 — 1,507,000 19,000 1,418,000 12,000 Municipal — — — — — — — Residential Term 11,065,000 12,152,000 — 11,343,000 161,000 11,283,000 73,000 Construction — — — — — — — Home equity line of credit 1,380,000 1,731,000 — 1,387,000 14,000 1,397,000 7,000 Consumer — — — — — — — $ 19,536,000 $ 21,503,000 $ — $ 19,666,000 $ 288,000 $ 19,512,000 $ 138,000 With an Allowance Recorded Commercial Real estate $ 4,167,000 $ 4,356,000 $ 221,000 $ 4,644,000 $ 85,000 $ 4,549,000 $ 43,000 Construction 763,000 763,000 103,000 763,000 18,000 763,000 9,000 Other 228,000 268,000 36,000 177,000 6,000 230,000 4,000 Municipal — — — — — — — Residential Term 1,925,000 2,067,000 209,000 1,971,000 41,000 1,864,000 21,000 Construction — — — — — — — Home equity line of credit 25,000 27,000 25,000 26,000 — 25,000 — Consumer — — — — — — — $ 7,108,000 $ 7,481,000 $ 594,000 $ 7,581,000 $ 150,000 $ 7,431,000 $ 77,000 Total Commercial Real estate $ 9,853,000 $ 10,527,000 $ 221,000 $ 10,073,000 $ 179,000 $ 9,963,000 $ 89,000 Construction 763,000 763,000 103,000 763,000 18,000 763,000 9,000 Other 1,633,000 1,717,000 36,000 1,684,000 25,000 1,648,000 16,000 Municipal — — — — — — — Residential Term 12,990,000 14,219,000 209,000 13,314,000 202,000 13,147,000 94,000 Construction — — — — — — — Home equity line of credit 1,405,000 1,758,000 25,000 1,413,000 14,000 1,422,000 7,000 Consumer — — — — — — — $ 26,644,000 $ 28,984,000 $ 594,000 $ 27,247,000 $ 438,000 $ 26,943,000 $ 215,000
Troubled Debt Restructurings on Financing Receivables	The following table shows these TDRs by class and the associated specific reserves included in the allowance for loan losses as of June 30, 2017 : Number of Loans Balance Specific Reserves Commercial Real estate — $ — $ — Construction — — — Other — — — Municipal — — — Residential Term 9 1,169,000 10,000 Construction — — — Home equity line of credit 1 167,000 — Consumer — — — 10 $ 1,336,000 $ 10,000 For the six months ended June 30, 2018 , 10 loans were placed on TDR status. The following table shows these TDRs by class and the associated specific reserves included in the allowance for loan losses as of June 30, 2018 : Number of Loans Pre-Modification Post-Modification Outstanding Specific Reserves Commercial Real estate 7 $ 1,056,000 $ 1,056,000 $ 42,000 Construction — — — — Other 1 6,727,000 6,532,000 1,100,000 Municipal — — — — Residential Term 2 441,000 436,000 26,000 Construction — — — — Home equity line of credit — — — — Consumer — — — — 10 $ 8,224,000 $ 8,024,000 $ 1,168,000 For the quarter ended June 30, 2018 , three loans were placed on TDR status. The following table shows these TDRs by class and the associated specific reserves included in the allowance for loan losses as of June 30, 2018 : Number of Loans Pre-Modification Post-Modification Outstanding Specific Reserves Commercial Real estate — $ — $ — $ — Construction — — — — Other 1 6,727,000 6,532,000 1,100,000 Municipal — — — — Residential Term 2 441,000 436,000 26,000 Construction — — — — Home equity line of credit — — — — Consumer — — — — 3 $ 7,168,000 $ 6,968,000 $ 1,126,000 For the six months ended June 30, 2018 , 10 loans were placed on TDR status. The following table shows these TDRs by class and the associated specific reserves included in the allowance for loan losses as of June 30, 2018 : Number of Loans Pre-Modification Post-Modification Outstanding Specific Reserves Commercial Real estate 7 $ 1,056,000 $ 1,056,000 $ 42,000 Construction — — — — Other 1 6,727,000 6,532,000 1,100,000 Municipal — — — — Residential Term 2 441,000 436,000 26,000 Construction — — — — Home equity line of credit — — — — Consumer — — — — 10 $ 8,224,000 $ 8,024,000 $ 1,168,000 The following table shows these TDRs by class and the associated specific reserves included in the allowance for loan losses as of June 30, 2018 : Number of Loans Balance Specific Reserves Commercial Real estate — $ — $ — Construction — — — Other — — — Municipal — — — Residential Term 7 726,000 33,000 Construction — — — Home equity line of credit 1 167,000 — Consumer — — — 8 $ 893,000 $ 33,000 The following table shows TDRs by class and the specific reserve as of June 30, 2018 : Number of Loans Balance Specific Reserves Commercial Real estate 15 $ 8,026,000 $ 143,000 Construction 1 741,000 — Other 5 7,071,000 1,100,000 Municipal — — — Residential Term 48 9,263,000 287,000 Construction — — — Home equity line of credit 3 505,000 — Consumer — — — 72 $ 25,606,000 $ 1,530,000 The following table shows TDRs by class and the specific reserve as of December 31, 2017 : Number of Loans Balance Specific Reserves Commercial Real estate 8 $ 7,038,000 $ 90,000 Construction 1 741,000 — Other 4 561,000 — Municipal — — — Residential Term 46 8,948,000 233,000 Construction — — — Home equity line of credit 3 513,000 — Consumer — — — 62 $ 17,801,000 $ 323,000 The following table shows TDRs by class and the specific reserve as of June 30, 2017 : Number of Loans Balance Specific Reserves Commercial Real estate 9 $ 8,040,000 $ 93,000 Construction 1 763,000 103,000 Other 5 749,000 1,000 Municipal — — — Residential Term 50 10,227,000 209,000 Construction — — — Home equity line of credit 3 522,000 — Consumer — — — 68 $ 20,301,000 $ 406,000

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Allowance for Loan Losses by Class of Financing Receivable and Allowance	A breakdown of the allowance for loan losses as of June 30, 2018 , December 31, 2017 , and June 30, 2017 , by class of financing receivable and allowance element, is presented in the following tables: As of June 30, 2018 Specific Reserves on Loans Evaluated Individually for Impairment General Reserves on Loans Based on Historical Loss Experience Reserves for Qualitative Factors Unallocated Reserves Total Reserves Commercial Real estate $ 270,000 $ 1,067,000 $ 2,395,000 $ — $ 3,732,000 Construction — 123,000 276,000 — 399,000 Other 1,647,000 563,000 1,265,000 — 3,475,000 Municipal — — 21,000 — 21,000 Residential Term 286,000 311,000 541,000 — 1,138,000 Construction — 10,000 19,000 — 29,000 Home equity line of credit 2,000 287,000 389,000 — 678,000 Consumer — 269,000 306,000 — 575,000 Unallocated — — — 1,425,000 1,425,000 $ 2,205,000 $ 2,630,000 $ 5,212,000 $ 1,425,000 $ 11,472,000 As of December 31, 2017 Specific Reserves on Loans Evaluated Individually for Impairment General Reserves on Loans Based on Historical Loss Experience Reserves for Qualitative Factors Unallocated Reserves Total Reserves Commercial Real estate $ 224,000 $ 1,285,000 $ 2,363,000 $ — $ 3,872,000 Construction — 153,000 281,000 — 434,000 Other 1,309,000 723,000 1,326,000 — 3,358,000 Municipal — — 20,000 — 20,000 Residential Term 255,000 311,000 564,000 — 1,130,000 Construction — 13,000 23,000 — 36,000 Home equity line of credit 24,000 297,000 371,000 — 692,000 Consumer — 251,000 294,000 — 545,000 Unallocated — — — 642,000 642,000 $ 1,812,000 $ 3,033,000 $ 5,242,000 $ 642,000 $ 10,729,000 As of June 30, 2017 Specific Reserves on Loans Evaluated Individually for Impairment General Reserves on Loans Based on Historical Loss Experience Reserves for Qualitative Factors Unallocated Reserves Total Reserves Commercial Real estate $ 221,000 $ 1,467,000 $ 2,308,000 $ — $ 3,996,000 Construction 103,000 161,000 253,000 — 517,000 Other 36,000 829,000 1,306,000 — 2,171,000 Municipal — — 19,000 — 19,000 Residential Term 209,000 249,000 541,000 — 999,000 Construction — 8,000 18,000 — 26,000 Home equity line of credit 25,000 300,000 359,000 — 684,000 Consumer — 245,000 284,000 — 529,000 Unallocated — — — 1,670,000 1,670,000 $ 594,000 $ 3,259,000 $ 5,088,000 $ 1,670,000 $ 10,611,000
Summary of Risk Ratings for Loans	The following table summarizes the risk ratings for the Company's commercial real estate, commercial construction, commercial other, and municipal loans as of June 30, 2018 : Commercial Real Estate Commercial Construction Commercial Other Municipal Loans All Risk- Rated Loans 1 Strong $ — $ — $ 1,404,000 $ — $ 1,404,000 2 Above Average 12,404,000 39,000 5,500,000 44,997,000 62,940,000 3 Satisfactory 73,164,000 3,027,000 40,950,000 603,000 117,744,000 4 Average 195,119,000 18,081,000 81,255,000 3,117,000 297,572,000 5 Watch 50,088,000 18,875,000 38,705,000 — 107,668,000 6 OAEM 1,410,000 — 1,373,000 — 2,783,000 7 Substandard 17,806,000 286,000 15,531,000 — 33,623,000 8 Doubtful 123,000 — — — 123,000 Total $ 350,114,000 $ 40,308,000 $ 184,718,000 $ 48,717,000 $ 623,857,000 The following table summarizes the risk ratings for the Company's commercial real estate, commercial construction, commercial other, and municipal loans as of December 31, 2017 : Commercial Real Estate Commercial Construction Commercial Other Municipal Loans All Risk- Rated Loans 1 Strong $ — $ — $ 1,586,000 $ — $ 1,586,000 2 Above Average 12,534,000 40,000 5,776,000 32,673,000 51,023,000 3 Satisfactory 73,899,000 2,856,000 38,151,000 718,000 115,624,000 4 Average 173,956,000 22,446,000 84,360,000 — 280,762,000 5 Watch 41,652,000 12,714,000 33,934,000 — 88,300,000 6 OAEM 3,442,000 — 2,765,000 — 6,207,000 7 Substandard 18,203,000 — 14,956,000 — 33,159,000 8 Doubtful 123,000 — — — 123,000 Total $ 323,809,000 $ 38,056,000 $ 181,528,000 $ 33,391,000 $ 576,784,000 The following table summarizes the risk ratings for the Company's commercial real estate, commercial construction, commercial other, and municipal loans as of June 30, 2017 : Commercial Real Estate Commercial Construction Commercial Other Municipal Loans All Risk- Rated Loans 1 Strong $ 2,000 $ — $ 1,004,000 $ — $ 1,006,000 2 Above Average 13,737,000 45,000 7,700,000 27,895,000 49,377,000 3 Satisfactory 84,550,000 2,827,000 52,024,000 800,000 140,201,000 4 Average 140,826,000 20,849,000 80,537,000 — 242,212,000 5 Watch 46,158,000 9,884,000 16,402,000 — 72,444,000 6 OAEM 3,283,000 — 3,920,000 — 7,203,000 7 Substandard 17,811,000 — 12,104,000 — 29,915,000 8 Doubtful 123,000 — — — 123,000 Total $ 306,490,000 $ 33,605,000 $ 173,691,000 $ 28,695,000 $ 542,481,000
Allowance for Loan Losses Transactions	The following table presents allowance for loan losses activity by class for the six months and quarter ended June 30, 2018 , and allowance for loan loss balances by class and related loan balances by class as of June 30, 2018 : Commercial Municipal Residential Home Equity Line of Credit Consumer Unallocated Total Real Estate Construction Other Term Construction For the six months ended June 30, 2018 Beginning balance $ 3,872,000 $ 434,000 $ 3,358,000 $ 20,000 $ 1,130,000 $ 36,000 $ 692,000 $ 545,000 $ 642,000 $ 10,729,000 Charge offs — — 17,000 — 96,000 — 115,000 145,000 — 373,000 Recoveries — — 10,000 — 42,000 — 13,000 51,000 — 116,000 Provision (credit) (140,000 ) (35,000 ) 124,000 1,000 62,000 (7,000 ) 88,000 124,000 783,000 1,000,000 Ending balance $ 3,732,000 $ 399,000 $ 3,475,000 $ 21,000 $ 1,138,000 $ 29,000 $ 678,000 $ 575,000 $ 1,425,000 $ 11,472,000 For the three months ended June 30, 2018 Beginning balance $ 3,732,000 $ 396,000 $ 3,540,000 $ 21,000 $ 1,129,000 $ 31,000 $ 716,000 $ 581,000 $ 811,000 $ 10,957,000 Charge offs — — — — 15,000 — — 40,000 — 55,000 Recoveries — — 4,000 — 38,000 — 2,000 26,000 — 70,000 Provision (credit) — 3,000 (69,000 ) — (14,000 ) (2,000 ) (40,000 ) 8,000 614,000 500,000 Ending balance $ 3,732,000 $ 399,000 $ 3,475,000 $ 21,000 $ 1,138,000 $ 29,000 $ 678,000 $ 575,000 $ 1,425,000 $ 11,472,000 Allowance for loan losses as of June 30, 2018 Ending balance specifically evaluated for impairment $ 270,000 $ — $ 1,647,000 $ — $ 286,000 $ — $ 2,000 $ — $ — $ 2,205,000 Ending balance collectively evaluated for impairment $ 3,462,000 $ 399,000 $ 1,828,000 $ 21,000 $ 852,000 $ 29,000 $ 676,000 $ 575,000 $ 1,425,000 $ 9,267,000 Related loan balances as of June 30, 2018 Ending balance $ 350,114,000 $ 40,308,000 $ 184,718,000 $ 48,717,000 $ 453,588,000 $ 14,583,000 $ 107,666,000 $ 24,746,000 $ — $ 1,224,440,000 Ending balance specifically evaluated for impairment $ 8,908,000 $ 1,027,000 $ 9,439,000 $ — $ 11,774,000 $ — $ 1,028,000 $ 16,000 $ — $ 32,192,000 Ending balance collectively evaluated for impairment $ 341,206,000 $ 39,281,000 $ 175,279,000 $ 48,717,000 $ 441,814,000 $ 14,583,000 $ 106,638,000 $ 24,730,000 $ — $ 1,192,248,000 The following table presents allowance for loan losses activity by class for the year ended December 31, 2017 and allowance for loan loss balances by class and related loan balances by class as of December 31, 2017 : Commercial Municipal Residential Home Equity Line of Credit Consumer Unallocated Total Real Estate Construction Other Term Construction Beginning balance $ 3,988,000 $ 396,000 $ 1,780,000 $ 18,000 $ 1,288,000 $ 44,000 $ 807,000 $ 559,000 $ 1,258,000 $ 10,138,000 Charge offs 587,000 — 212,000 — 456,000 — 28,000 335,000 — 1,618,000 Recoveries — — 49,000 — 40,000 — 11,000 109,000 — 209,000 Provision (credit) 471,000 38,000 1,741,000 2,000 258,000 (8,000 ) (98,000 ) 212,000 (616,000 ) 2,000,000 Ending balance $ 3,872,000 $ 434,000 $ 3,358,000 $ 20,000 $ 1,130,000 $ 36,000 $ 692,000 $ 545,000 $ 642,000 $ 10,729,000 Ending balance specifically evaluated for impairment $ 224,000 $ — $ 1,309,000 $ — $ 255,000 $ — $ 24,000 $ — $ — $ 1,812,000 Ending balance collectively evaluated for impairment $ 3,648,000 $ 434,000 $ 2,049,000 $ 20,000 $ 875,000 $ 36,000 $ 668,000 $ 545,000 $ 642,000 $ 8,917,000 Ending balance $ 323,809,000 $ 38,056,000 $ 181,528,000 $ 33,391,000 $ 432,661,000 $ 17,868,000 $ 111,302,000 $ 25,524,000 $ — $ 1,164,139,000 Ending balance specifically evaluated for impairment $ 7,790,000 $ 741,000 $ 9,918,000 $ — $ 11,748,000 $ — $ 1,179,000 $ 16,000 $ — $ 31,392,000 Ending balance collectively evaluated for impairment $ 316,019,000 $ 37,315,000 $ 171,610,000 $ 33,391,000 $ 420,913,000 $ 17,868,000 $ 110,123,000 $ 25,508,000 $ — $ 1,132,747,000 The following table presents allowance for loan losses activity by class for the six months and quarter ended June 30, 2017 , and allowance for loan loss balances by class and related loan balances by class as of June 30, 2017 : Commercial Municipal Residential Home Equity Line of Credit Consumer Unallocated Total Real Estate Construction Other Term Construction For the six months ended June 30, 2017 Beginning balance $ 3,988,000 $ 396,000 $ 1,780,000 $ 18,000 $ 1,288,000 $ 44,000 $ 807,000 $ 559,000 $ 1,258,000 $ 10,138,000 Charge offs 305,000 — 58,000 — 70,000 — 28,000 156,000 — 617,000 Recoveries — — 18,000 — 19,000 — 3,000 50,000 — 90,000 Provision (credit) 313,000 121,000 431,000 1,000 (238,000 ) (18,000 ) (98,000 ) 76,000 412,000 1,000,000 Ending balance $ 3,996,000 $ 517,000 $ 2,171,000 $ 19,000 $ 999,000 $ 26,000 $ 684,000 $ 529,000 $ 1,670,000 $ 10,611,000 For the three months ended June 30, 2017 Beginning balance $ 4,015,000 $ 441,000 $ 1,925,000 $ 18,000 $ 969,000 $ 24,000 $ 811,000 $ 573,000 $ 1,591,000 $ 10,367,000 Charge offs 141,000 — 58,000 — 17,000 — 21,000 53,000 — 290,000 Recoveries — — 7,000 — 5,000 — 3,000 19,000 — 34,000 Provision (credit) 122,000 76,000 297,000 1,000 42,000 2,000 (109,000 ) (10,000 ) 79,000 500,000 Ending balance $ 3,996,000 $ 517,000 $ 2,171,000 $ 19,000 $ 999,000 $ 26,000 $ 684,000 $ 529,000 $ 1,670,000 $ 10,611,000 Allowance for loan losses as of June 30, 2017 Ending balance specifically evaluated for impairment $ 221,000 $ 103,000 $ 36,000 $ — $ 209,000 $ — $ 25,000 $ — $ — $ 594,000 Ending balance collectively evaluated for impairment $ 3,775,000 $ 414,000 $ 2,135,000 $ 19,000 $ 790,000 $ 26,000 $ 659,000 $ 529,000 $ 1,670,000 $ 10,017,000 Related loan balances as of June 30, 2017 Ending balance $ 306,490,000 $ 33,605,000 $ 173,691,000 $ 28,695,000 $ 427,171,000 $ 15,056,000 $ 110,328,000 $ 25,629,000 $ — $ 1,120,665,000 Ending balance specifically evaluated for impairment $ 9,853,000 $ 763,000 $ 1,633,000 $ — $ 12,990,000 $ — $ 1,405,000 $ — $ — $ 26,644,000 Ending balance collectively evaluated for impairment $ 296,637,000 $ 32,842,000 $ 172,058,000 $ 28,695,000 $ 414,181,000 $ 15,056,000 $ 108,923,000 $ 25,629,000 $ — $ 1,094,021,000

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Nonvested Restricted Stock Units Activity	As of June 30, 2018 , 144,355 shares of restricted stock had been granted under the 2010 Plan, of which 67,689 shares remain restricted as of June 30, 2018 as detailed in the following table: Year Granted Vesting Term (In Years) Shares Remaining Term (In Years) 2014 5.0 10,422 0.6 2015 5.0 12,023 1.6 2016 5.0 15,015 2.5 2017 3.0 4,902 1.6 2017 5.0 9,972 3.5 2018 1.0 300 0.6 2018 2.0 932 1.5 2018 3.0 2,400 2.6 2018 4.0 2,068 3.5 2018 5.0 9,655 4.5 67,689 2.3

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Basic and Diluted Earnings per Share (EPS)	The following table sets forth the computation of basic and diluted earnings per share (EPS) for the six months ended June 30, 2018 and 2017 : Income (Numerator) Shares (Denominator) Per-Share Amount For the six months ended June 30, 2018 Net income as reported $ 11,240,000 Basic EPS: Income available to common shareholders 11,240,000 10,776,680 $ 1.04 Effect of dilutive securities: restricted stock 70,443 Diluted EPS: Income available to common shareholders plus assumed conversions $ 11,240,000 10,847,123 $ 1.04 For the six months ended June 30, 2017 Net income as reported $ 9,520,000 Basic EPS: Income available to common shareholders 9,520,000 10,740,355 $ 0.89 Effect of dilutive securities: restricted stock 72,348 Diluted EPS: Income available to common shareholders plus assumed conversions $ 9,520,000 10,812,703 $ 0.88 The following table sets forth the computation of basic diluted EPS for the quarters ended June 30, 2018 and 2017: Income (Numerator) Shares (Denominator) Per-Share Amount For the quarter ended June 30, 2018 Net income as reported $ 5,734,000 Basic EPS: Income available to common shareholders 5,734,000 10,779,275 $ 0.53 Effect of dilutive securities: restricted stock 70,443 Diluted EPS: Income available to common shareholders plus assumed conversions $ 5,734,000 10,849,718 $ 0.53 For the quarter ended June 30, 2017 Net income as reported $ 4,883,000 Basic EPS: Income available to common shareholders 4,883,000 10,746,363 $ 0.45 Effect of dilutive securities: restricted stock 71,086 Diluted EPS: Income available to common shareholders plus assumed conversions $ 4,883,000 10,817,449 $ 0.45

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	6 Months Ended
	Jun. 30, 2018
Retirement Benefits, Description [Abstract]
Accumulated post-retirement benefit obligation and funded status	The following table sets forth the accumulated postretirement benefit obligation and funded status: At or for the six months ended June 30, 2018 2017 Change in benefit obligation Benefit obligation at beginning of year $ 1,874,000 $ 1,870,000 Interest cost 38,000 38,000 Benefits paid (56,000 ) (64,000 ) Benefit obligation at end of period $ 1,856,000 $ 1,844,000 Funded status Benefit obligation at end of period $ (1,856,000 ) $ (1,844,000 ) Unamortized loss 186,000 102,000 Accrued benefit cost at end of period $ (1,670,000 ) $ (1,742,000 )
Schedule of net pension costs	The following table sets forth the net periodic pension cost: For the six months ended June 30, For the quarter ended June 30, 2018 2017 2018 2017 Components of net periodic benefit cost Interest cost $ 38,000 $ 38,000 $ 19,000 $ 19,000 Net periodic benefit cost $ 38,000 $ 38,000 $ 19,000 $ 19,000
Schedule of net periodic benefit cost not yet recognized	Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive income (loss) are as follows: June 30, December 31, 2017 June 30, Unamortized net actuarial loss $ (186,000 ) $ (186,000 ) $ (156,000 ) Deferred tax benefit at 21% (for June 30, 2018 and December 31, 2017) and 35% (for June 30, 2017) 39,000 39,000 54,000 Net unrecognized postretirement benefits included in accumulated other comprehensive income (loss) $ (147,000 ) $ (147,000 ) $ (102,000 )

Other Comprehensive Income (L32

Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income (Loss)	The following table summarizes activity in the unrealized loss on securities transferred from available for sale to held to maturity included in other comprehensive income (loss) for the six months and quarter ended June 30, 2018 and 2017 . For the six months ended June 30, For the quarter ended June 30, 2018 2017 2018 2017 Balance at beginning of period $ (174,000 ) $ (129,000 ) $ (182,000 ) $ (133,000 ) Amortization of net unrealized losses (19,000 ) (12,000 ) (9,000 ) (6,000 ) Related deferred taxes (at a Federal Income Tax rate of 21% for June 30, 2018 and 35% for June 30, 2017) 4,000 4,000 2,000 2,000 Net change (15,000 ) (8,000 ) (7,000 ) (4,000 ) Balance at end of period $ (189,000 ) $ (137,000 ) $ (189,000 ) $ (137,000 ) The following table presents the effect of the Company's derivative financial instruments included in other comprehensive income (loss) for the six months and quarter ended June 30, 2018 and 2017 . For the six months ended June 30, For the quarter ended June 30, 2018 2017 2018 2017 Balance at beginning of period $ 1,544,000 $ 1,163,000 $ 1,928,000 $ 1,226,000 Unrealized gains, (losses) on cash flow hedging derivatives arising during the period 661,000 (167,000 ) 175,000 (263,000 ) Related deferred taxes (at a Federal Income Tax rate of 21% for June 30, 2018 and 35% for June 30, 2017) (139,000 ) 59,000 (37,000 ) 92,000 Net change 522,000 (108,000 ) 138,000 (171,000 ) Balance at end of period $ 2,066,000 $ 1,055,000 $ 2,066,000 $ 1,055,000 The following table summarizes activity in the unrealized gain or loss on postretirement benefits included in other comprehensive income (loss) for the six months and quarter ended June 30, 2018 and 2017 . For the six months ended June 30, For the quarter ended June 30, 2018 2017 2018 2017 Unrecognized postretirement benefits at beginning of period $ (147,000 ) $ (102,000 ) $ (147,000 ) $ (102,000 ) Amortization of unrecognized transition obligation — — — — Change in unamortized net actuarial gain (loss) — — — — Related deferred taxes (at a Federal Income Tax rate of 21% for June 30, 2018 and 35% for June 30, 2017) — — — — Unrecognized postretirement benefits at end of period $ (147,000 ) $ (102,000 ) $ (147,000 ) $ (102,000 ) The following table summarizes activity in the unrealized gain or loss on available for sale securities included in other comprehensive income (loss) for the six months and quarter ended June 30, 2018 and 2017 . For the six months ended June 30, For the quarter ended June 30, 2018 2017 2018 2017 Balance at beginning of period $ (2,901,000 ) $ (935,000 ) $ (6,210,000 ) $ (934,000 ) Unrealized gains (losses) arising during the period (5,363,000 ) 541,000 (1,311,000 ) 536,000 Reclassification of realized gains during the period (136,000 ) (3,000 ) — — Related deferred taxes (at a Federal Income Tax rate of 21% for June 30, 2018 and 35% for June 30, 2017) 1,155,000 (188,000 ) 276,000 (187,000 ) Net change (4,344,000 ) 350,000 (1,035,000 ) 349,000 Balance at end of period $ (7,245,000 ) $ (585,000 ) $ (7,245,000 ) $ (585,000 )

Financial Derivative Instrume33

Financial Derivative Instruments (Tables)	6 Months Ended
	Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The details of the interest rate swap agreements are as follows: June 30, 2018 December 31, 2017 June 30, 2017 Notional Amount Effective Date Maturity Date Variable Index Received Fixed Rate Paid Fair Value (1) Fair Value (1) Fair Value (1) $ 30,000,000 June 28, 2016 June 28, 2021 1-Month USD LIBOR 0.940 % $ 1,521,000 $ 1,154,000 $ 952,000 20,000,000 June 27, 2016 June 27, 2021 1-Month USD LIBOR 0.893 % 1,041,000 801,000 671,000 25,000,000 June 5, 2018 December 5, 2019 1-Month USD LIBOR 2.466 % 11,000 — — 25,000,000 June 5, 2018 June 5, 2020 1-Month USD LIBOR 2.547 % 19,000 — — 25,000,000 June 5, 2018 December 5, 2020 1-Month USD LIBOR 2.603 % 24,000 — — $ 125,000,000 $ 2,616,000 $ 1,955,000 $ 1,623,000 (1) Presented within other assets in the consolidated balance sheet.

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	6 Months Ended
	Jun. 30, 2018
Transfers and Servicing [Abstract]
Reconciliation of Mortgage Servicing Assets	Mortgage servicing rights are included in other assets and detailed in the following table: June 30, December 31, June 30, Mortgage servicing rights $ 5,546,000 $ 5,428,000 $ 5,199,000 Accumulated amortization (4,261,000 ) (4,160,000 ) (4,072,000 ) Impairment reserve — — (18,000 ) $ 1,285,000 $ 1,268,000 $ 1,109,000

Certificates of Deposit (Tables

Certificates of Deposit (Tables)	6 Months Ended
	Jun. 30, 2018
Banking and Thrift [Abstract]
Certificates of Deposit	The following table represents the breakdown of certificates of deposit at June 30, 2018 and 2017 , and at December 31, 2017 : June 30, 2018 December 31, 2017 June 30, 2017 Certificates of deposit < $100,000 $ 400,680,000 $ 284,066,000 $ 270,875,000 Certificates $100,000 to $250,000 204,311,000 232,759,000 212,063,000 Certificates $250,000 and over 52,400,000 42,176,000 44,556,000 $ 657,391,000 $ 559,001,000 $ 527,494,000

Fair Value (Tables)

Fair Value (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Assets Measured on Recurring Basis Measured at Fair Value	The following tables present the balances of assets that were measured at fair value on a recurring basis as of June 30, 2018 , December 31, 2017 and June 30, 2017 . At June 30, 2018 Level 1 Level 2 Level 3 Total Securities available for sale Mortgage-backed securities $ — $ 297,378,000 $ — $ 297,378,000 State and political subdivisions — 4,692,000 — 4,692,000 Other equity securities — 2,978,000 — 2,978,000 Total securities available for sale — 305,048,000 — 305,048,000 Interest rate swap agreements — 2,616,000 — 2,616,000 Total assets $ — $ 307,664,000 $ — $ 307,664,000 At December 31, 2017 Level 1 Level 2 Level 3 Total Securities available for sale Mortgage-backed securities $ — $ 289,989,000 $ — $ 289,989,000 State and political subdivisions — 6,769,000 — 6,769,000 Other equity securities — 3,414,000 — 3,414,000 Total securities available for sale — 300,172,000 — 300,172,000 Interest rate swap agreements — 1,955,000 — 1,955,000 Total assets $ — $ 302,127,000 $ — $ 302,127,000 At June 30, 2017 Level 1 Level 2 Level 3 Total Securities available for sale Mortgage-backed securities $ — $ 288,991,000 $ — $ 288,991,000 State and political subdivisions — 15,828,000 — 15,828,000 Other equity securities — 3,327,000 — 3,327,000 Total securities available for sale — 308,146,000 — 308,146,000 Interest rate swap agreements — 1,623,000 — 1,623,000 Total assets $ — $ 309,769,000 $ — $ 309,769,000
Assets Measured on Nonrecurring Basis Measured at Fair Value	The following tables include assets measured at fair value on a nonrecurring basis that have had a fair value adjustment since their initial recognition. Other real estate owned is presented net of an allowance of $53,000 and $39,000 at December 31, 2017 , and June 30, 2017 , respectively. There was no allowance at June 30, 2018. Only collateral-dependent impaired loans with a related specific allowance for loan losses or a partial charge off are included in impaired loans for purposes of fair value disclosures. Impaired loans below are presented net of specific allowances of $1,893,000 , $1,531,000 and $202,000 at June 30, 2018 , December 31, 2017 , and June 30, 2017 , respectively. At June 30, 2018 Level 1 Level 2 Level 3 Total Other real estate owned $ — $ 609,000 $ — $ 609,000 Impaired loans — 6,387,000 — 6,387,000 Total assets $ — $ 6,996,000 $ — $ 6,996,000 At December 31, 2017 Level 1 Level 2 Level 3 Total Other real estate owned $ — $ 1,012,000 $ — $ 1,012,000 Impaired loans — 6,521,000 — 6,521,000 Total assets $ — $ 7,533,000 $ — $ 7,533,000 At June 30, 2017 Level 1 Level 2 Level 3 Total Other real estate owned $ — $ 324,000 $ — $ 324,000 Impaired loans — 269,000 — 269,000 Total assets $ — $ 593,000 $ — $ 593,000
Estimated Fair Value of Financial Instruments	The carrying amount and estimated fair values for financial instruments as of June 30, 2018 were as follows: Carrying value Estimated fair value Level 1 Level 2 Level 3 Financial assets Cash and cash equivalents $ 21,056,000 $ 21,056,000 $ 21,056,000 $ — $ — Interest bearing deposits in other banks 1,616,000 1,616,000 1,616,000 — — Securities available for sale 305,048,000 305,048,000 — 305,048,000 — Securities to be held to maturity 260,077,000 256,316,000 — 256,316,000 — Restricted equity securities 12,363,000 12,363,000 — 12,363,000 — Loans held for sale 481,000 481,000 — 481,000 — Loans (net of allowance for loan losses) Commercial Real estate 345,853,000 338,784,000 — 423,000 338,361,000 Construction 39,852,000 39,037,000 — — 39,037,000 Other 180,750,000 178,904,000 — 5,527,000 173,377,000 Municipal 48,693,000 47,790,000 — — 47,790,000 Residential Term 452,289,000 441,029,000 — 339,000 440,690,000 Construction 14,550,000 14,443,000 — — 14,443,000 Home equity line of credit 106,892,000 105,264,000 — 98,000 105,166,000 Consumer 24,089,000 23,322,000 — — 23,322,000 Total loans 1,212,968,000 1,188,573,000 — 6,387,000 1,182,186,000 Mortgage servicing rights 1,285,000 2,581,000 — 2,581,000 — Interest rate swap agreements 2,616,000 2,616,000 — 2,616,000 — Accrued interest receivable 7,723,000 7,723,000 — 7,723,000 — Financial liabilities Demand deposits $ 146,964,000 $ 136,167,000 $ — $ 136,167,000 $ — NOW deposits 282,449,000 254,619,000 — 254,619,000 — Money market deposits 100,378,000 93,978,000 — 93,978,000 — Savings deposits 229,464,000 194,141,000 — 194,141,000 — Local certificates of deposit 267,932,000 263,342,000 — 263,342,000 — National certificates of deposit 389,459,000 389,062,000 — 389,062,000 — Total deposits 1,416,646,000 1,331,309,000 — 1,331,309,000 — Repurchase agreements 91,764,000 88,560,000 — 88,560,000 — Federal Home Loan Bank advances 205,691,000 204,476,000 — 204,476,000 — Total borrowed funds 297,455,000 293,036,000 — 293,036,000 — Accrued interest payable 943,000 943,000 — 943,000 — The carrying amounts and estimated fair values for financial instruments as of December 31, 2017 were as follows: Carrying value Estimated fair value Level 1 Level 2 Level 3 Financial assets Cash and cash equivalents $ 19,207,000 $ 19,207,000 $ 19,207,000 $ — $ — Interest bearing deposits in other banks 860,000 860,000 860,000 — — Securities available for sale 300,172,000 300,172,000 — 300,172,000 — Securities to be held to maturity 256,567,000 259,655,000 — 259,655,000 — Restricted equity securities 10,358,000 10,358,000 — 10,358,000 — Loans held for sale 386,000 386,000 — 386,000 — Loans (net of allowance for loan losses) Commercial Real estate 319,691,000 311,321,000 — 72,000 311,249,000 Construction 37,594,000 36,610,000 — — 36,610,000 Other 177,956,000 175,455,000 — 6,018,000 169,437,000 Municipal 33,370,000 33,280,000 — — 33,280,000 Residential Term 431,459,000 431,028,000 — 391,000 430,637,000 Construction 17,830,000 17,613,000 — — 17,613,000 Home equity line of credit 110,566,000 109,012,000 — 40,000 108,972,000 Consumer 24,944,000 24,408,000 — — 24,408,000 Total loans 1,153,410,000 1,138,727,000 — 6,521,000 1,132,206,000 Mortgage servicing rights 1,268,000 2,321,000 — 2,321,000 — Interest rate swap agreements 1,955,000 1,955,000 — 1,955,000 — Accrued interest receivable 5,867,000 5,867,000 — 5,867,000 — Financial liabilities Demand deposits $ 145,332,000 $ 139,350,000 $ — $ 139,350,000 $ — NOW deposits 318,043,000 295,775,000 — 295,775,000 — Money market deposits 163,898,000 153,497,000 — 153,497,000 — Savings deposits 232,605,000 203,799,000 — 203,799,000 — Local certificates of deposit 223,074,000 220,734,000 — 220,734,000 — National certificates of deposit 335,927,000 335,775,000 — 335,775,000 — Total deposits 1,418,879,000 1,348,930,000 — 1,348,930,000 — Repurchase agreements 70,564,000 67,976,000 — 67,976,000 — Federal Home Loan Bank advances 158,194,000 156,396,000 — 156,396,000 — Total borrowed funds 228,758,000 224,372,000 — 224,372,000 — Accrued interest payable 642,000 642,000 — 642,000 — The carrying amount and estimated fair values for financial instruments as of June 30, 2017 were as follows: Carrying value Estimated fair value Level 1 Level 2 Level 3 Financial assets Cash and cash equivalents $ 20,189,000 $ 20,189,000 $ 20,189,000 $ — $ — Interest bearing deposits in other banks 3,820,000 3,820,000 3,820,000 — — Securities available for sale 308,146,000 308,146,000 — 308,146,000 — Securities to be held to maturity 244,123,000 246,238,000 — 246,238,000 — Restricted equity securities 12,311,000 12,311,000 — 12,311,000 — Loans held for sale 865,000 865,000 — 865,000 — Loans (net of allowance for loan losses) Commercial Real estate 301,722,000 295,339,000 — — 295,339,000 Construction 32,989,000 32,291,000 — — 32,291,000 Other 171,099,000 169,509,000 — 33,000 169,476,000 Municipal 28,672,000 28,902,000 — — 28,902,000 Residential Term 425,985,000 428,556,000 — 236,000 428,320,000 Construction 15,025,000 14,983,000 — — 14,983,000 Home equity line of credit 109,516,000 107,855,000 — — 107,855,000 Consumer 25,046,000 24,654,000 — — 24,654,000 Total loans 1,110,054,000 1,102,089,000 — 269,000 1,101,820,000 Mortgage servicing rights 1,109,000 1,888,000 — 1,888,000 — Interest rate swap agreements 1,623,000 1,623,000 — 1,623,000 — Accrued interest receivable 7,192,000 7,192,000 — 7,192,000 — Financial liabilities Demand deposits $ 137,061,000 $ 133,002,000 $ — $ 133,002,000 $ — NOW deposits 293,553,000 274,476,000 — 274,476,000 — Money market deposits 134,760,000 126,402,000 — 126,402,000 — Savings deposits 226,391,000 200,712,000 — 200,712,000 — Local certificates of deposit 217,495,000 217,021,000 — 217,021,000 — National certificates of deposit 309,999,000 309,853,000 — 309,853,000 — Total deposits 1,319,259,000 1,261,466,000 — 1,261,466,000 — Repurchase agreements 67,154,000 64,852,000 — 64,852,000 — Federal Home Loan Bank advances 215,123,000 214,893,000 — 214,893,000 — Total borrowed funds 282,277,000 279,745,000 — 279,745,000 — Accrued interest payable 603,000 603,000 — 603,000 —

Investment Securities - Amortiz

Investment Securities - Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Debt Securities, Available-for-sale [Line Items]
Other equity securities	$ 2,978	$ 3,414	$ 3,327
Securities available for sale, Amortized Cost	314,219
Securities available for sale, Unrealized Gains	144
Securities available for sale, Unrealized Losses	(9,315)
Securities available for sale	305,048
Amortized Cost		303,845	309,046
Unrealized Gains		859	1,932
Unrealized Losses		(4,532)	(2,832)
Fair Value (Estimated)		300,172	308,146
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	306,286
Unrealized Gains	144
Unrealized Losses	(9,052)
Fair Value (Estimated)	297,378
Amortized Cost		293,689	290,379
Unrealized Gains		722	1,381
Unrealized Losses		(4,422)	(2,769)
Fair Value (Estimated)		289,989	288,991
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,955
Unrealized Gains	0
Unrealized Losses	(263)
Fair Value (Estimated)	$ 4,692
Amortized Cost		6,860	15,401
Unrealized Gains		16	486
Unrealized Losses		(107)	(59)
Fair Value (Estimated)		6,769	15,828
Other equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		3,296	3,266
Unrealized Gains		121	65
Unrealized Losses		(3)	(4)
Fair Value (Estimated)		$ 3,414	$ 3,327

Investment Securities - Amort38

Investment Securities - Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 260,077	$ 256,567	$ 244,123
Unrealized Gains	1,678	4,499	4,393
Unrealized Losses	(5,439)	(1,411)	(2,278)
Fair Value (Estimated)	256,316	259,655	246,238
U.S. Government-sponsored agencies
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	11,155	11,155	11,152
Unrealized Gains	0	0	0
Unrealized Losses	(584)	(180)	(181)
Fair Value (Estimated)	10,571	10,975	10,971
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	20,585	23,284	27,224
Unrealized Gains	404	568	820
Unrealized Losses	(365)	(128)	(41)
Fair Value (Estimated)	20,624	23,724	28,003
State and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	224,037	217,828	201,447
Unrealized Gains	1,274	3,931	3,573
Unrealized Losses	(4,490)	(1,103)	(2,056)
Fair Value (Estimated)	220,821	220,656	202,964
Corporate securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	4,300	4,300	4,300
Unrealized Gains	0	0	0
Unrealized Losses	0	0	0
Fair Value (Estimated)	$ 4,300	$ 4,300	$ 4,300

Investment Securities - Amort39

Investment Securities - Amortized Cost and Estimated Fair Value of Restricted Equity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Federal Home Loan Bank Stock	$ 11,326	$ 9,321	$ 11,274
Federal Reserve Bank Stock	1,037	1,037	1,037
Restricted equity securities	$ 12,363	$ 10,358	$ 12,311

Investment Securities - Contrac

Investment Securities - Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Due in 1 year or less, Securities available for sale, Amortized Cost	$ 34	$ 111	$ 26
Due in 1 to 5 years, Securities available for sale, Amortized Cost	9,349	841	1,722
Due in 5 to 10 years, Securities available for sale, Amortized Cost	71,309	29,003	34,382
Due after 10 years, Securities available for sale, Amortized Cost	230,549	270,594	269,650
Equity securities, Amortized Cost	2,978	3,296	3,266
Amortized Cost	314,219
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Due in 1 year or less, Securities available for sale, Fair Value (Estimated)	34	112	26
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated)	9,341	842	1,758
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated)	69,745	29,177	35,099
Due after 10 years, Securities available for sale, Fair Value (Estimated)	222,950	266,627	267,936
Other equity securities	2,978	3,414	3,327
Securities available for sale, Fair Value (Estimated)	305,048
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Due in 1 year or less, Securities to be held to maturity, Amortized Cost	1,327	635	707
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost	23,621	18,059	14,536
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost	155,096	37,182	41,373
Due after 10 years, Securities to be held to maturity, Amortized Cost	80,033	200,691	187,507
Securities to be held to maturity, Amortized Cost	260,077	256,567	244,123
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Due in 1 year or less, Securities to be held to maturity, Fair Value (Estimated)	1,329	637	710
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated)	23,698	18,164	14,813
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated)	153,240	37,719	42,251
Due after 10 years, Securities to be held to maturity, Fair Value (Estimated)	78,049	203,135	188,464
Securities to be held to maturity, Fair Value (Estimated)	$ 256,316	$ 259,655	$ 246,238

Investment Securities - Additio

Investment Securities - Additional Information (Details) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2018USD ($)securitystate	Jun. 30, 2017USD ($)security	Dec. 31, 2017USD ($)security	Sep. 30, 2014USD ($)
Investment [Line Items]
Number of securities temporarily impaired (security) | security	480	235	241
Number of securities temporarily impaired for twelve months or more (security) | security	160	15	157
Length of time securities temporarily impaired (months)	12 months	12 months	12 months
Amortized cost of transferred securities from available-for-sale to held-to-maturity				$ 89,780
Fair value of transferred securities from available-for-sale to held-to-maturity				89,757
Net unrealized loss, net of taxes on transferred securities				$ 15
Unamortized balance of net unrealized losses	$ 189	$ 137	$ 174
Number of states in New England where FHLB serve (state) | state	6
Federal Home Loan Bank Stock	$ 11,326	11,274	9,321
Other equity securities
Investment [Line Items]
Fair value of securities pledged as collateral	$ 203,196	$ 188,448	$ 231,516

Investment Securities - Gains a

Investment Securities - Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales of securities	$ 0	$ 0	$ 459	$ 3
Gross realized gains	0	0	136	3
Gross realized losses	0	0	0	0
Net gain	0	0	136	3
Related income taxes	$ 0	$ 0	$ 29	$ 1

Investment Securities - Tempora

Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 280,229	$ 148,611	$ 234,959
Unrealized Losses (Less than 12 months)	(7,761)	(2,100)	(4,910)
Fair Value (Estimated) (12 months or more)	132,575	144,394	7,652
Unrealized Losses (12 months or more)	(6,993)	(3,843)	(200)
Fair Value (Estimated)	412,804	293,005	242,611
Unrealized Losses	(14,754)	(5,943)	(5,110)
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	6,882	7,161	7,972
Unrealized Losses (Less than 12 months)	(373)	(94)	(181)
Fair Value (Estimated) (12 months or more)	3,689	3,814	0
Unrealized Losses (12 months or more)	(211)	(86)	0
Fair Value (Estimated)	10,571	10,975	7,972
Unrealized Losses	(584)	(180)	(181)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	202,673	132,025	170,966
Unrealized Losses (Less than 12 months)	(5,660)	(1,857)	(2,613)
Fair Value (Estimated) (12 months or more)	91,977	101,707	7,643
Unrealized Losses (12 months or more)	(3,757)	(2,693)	(197)
Fair Value (Estimated)	294,650	233,732	178,609
Unrealized Losses	(9,417)	(4,550)	(2,810)
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	70,674	9,425	55,952
Unrealized Losses (Less than 12 months)	(1,728)	(149)	(2,115)
Fair Value (Estimated) (12 months or more)	36,909	38,864	0
Unrealized Losses (12 months or more)	(3,025)	(1,061)	0
Fair Value (Estimated)	107,583	48,289	55,952
Unrealized Losses	$ (4,753)	(1,210)	(2,115)
Other equity securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)		0	69
Unrealized Losses (Less than 12 months)		0	(1)
Fair Value (Estimated) (12 months or more)		9	9
Unrealized Losses (12 months or more)		(3)	(3)
Fair Value (Estimated)		9	78
Unrealized Losses		$ (3)	$ (4)

Loans - Loan Portfolio (Details

Loans - Loan Portfolio (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Schedule of Financing Receivables [Line Items]
Loans	$ 1,224,440	$ 1,164,139	$ 1,120,665
Percentage of loans receivable, by type	100.00%	100.00%	100.00%
Commercial | Real estate
Schedule of Financing Receivables [Line Items]
Loans	$ 350,114	$ 323,809	$ 306,490
Percentage of loans receivable, by type	28.60%	27.80%	27.40%
Commercial | Construction
Schedule of Financing Receivables [Line Items]
Loans	$ 40,308	$ 38,056	$ 33,605
Percentage of loans receivable, by type	3.30%	3.30%	3.00%
Commercial | Other
Schedule of Financing Receivables [Line Items]
Loans	$ 184,718	$ 181,528	$ 173,691
Percentage of loans receivable, by type	15.10%	15.60%	15.50%
Municipal
Schedule of Financing Receivables [Line Items]
Loans	$ 48,717	$ 33,391	$ 28,695
Percentage of loans receivable, by type	4.00%	2.90%	2.60%
Residential | Construction
Schedule of Financing Receivables [Line Items]
Loans	$ 14,583	$ 17,868	$ 15,056
Percentage of loans receivable, by type	1.20%	1.50%	1.30%
Residential | Term
Schedule of Financing Receivables [Line Items]
Loans	$ 453,588	$ 432,661	$ 427,171
Percentage of loans receivable, by type	37.00%	37.10%	38.10%
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Loans	$ 107,666	$ 111,302	$ 110,328
Percentage of loans receivable, by type	8.80%	9.60%	9.80%
Consumer
Schedule of Financing Receivables [Line Items]
Loans	$ 24,746	$ 25,524	$ 25,629
Percentage of loans receivable, by type	2.00%	2.20%	2.30%

Loans - Narrative (Details)

Loans - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018USD ($)loan	Jun. 30, 2017USD ($)loan	Jun. 30, 2018USD ($)loan	Jun. 30, 2017USD ($)loan	Dec. 31, 2017USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net deferred loan costs	$ 6,307	$ 5,469	$ 6,307	$ 5,469	$ 5,748
Qualifying first mortgage loans	317,053	249,329	317,053	249,329	239,805
Loans pledged as collateral	227,084	294,315	$ 227,084	$ 294,315	$ 290,247
Loans classified as TDR (loan) | loan			72	68	62
Value of loans classified as TDR	$ 25,606	$ 20,301	$ 25,606	$ 20,301	$ 17,801
Number of Loans | loan	8	10	8	10
Value of TDR loans more than 30 days past due	$ 893	$ 1,336	$ 893	$ 1,336
Number of TDR loans more than 30 days past due (loan) | loan		0		0
Number of loans placed on TDR status (loan) | loan	3	0	10	0
Number of TDR loans involved in bankruptcy (loan) | loan	4		4
Value of TDR loans involved in bankruptcy	$ 681		$ 681
Number of TDR loans on non-accrual status (loan) | loan	12		12
Value of TDR loans on non-accrual status	$ 7,795		$ 7,795
Number of TDR loans in the process of foreclosure (loan) | loan	4		4
Loans classified as TDRs in process of foreclosure	$ 504		$ 504
Number of mortgage loans in the process of foreclosure (loan) | loan	14	12	14	12
Value of mortgage loans in the process of foreclosure	$ 1,524	$ 1,919	$ 1,524	$ 1,919
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of days past due			30 days	30 days

Loans - Past-due Status of Loan

Loans - Past-due Status of Loans by Class (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Schedule of Financing Receivables [Line Items]
All Past Due	$ 7,438	$ 18,676	$ 9,786
Current	1,217,002	1,145,463	1,110,879
Total	1,224,440	1,164,139	1,120,665
90 Days or More & Accruing	3	445	29
30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	2,112	2,944	1,471
60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	2,206	11,948	4,126
90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	3,120	3,784	4,189
Commercial | Real estate
Schedule of Financing Receivables [Line Items]
All Past Due	715	874	1,475
Current	349,399	322,935	305,015
Total	350,114	323,809	306,490
90 Days or More & Accruing	0	0	0
Commercial | Real estate | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	137	574	88
Commercial | Real estate | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	75	80	0
Commercial | Real estate | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	503	220	1,387
Commercial | Construction
Schedule of Financing Receivables [Line Items]
All Past Due	0	0	0
Current	40,308	38,056	33,605
Total	40,308	38,056	33,605
90 Days or More & Accruing	0	0	0
Commercial | Construction | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	0	0	0
Commercial | Construction | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	0	0	0
Commercial | Construction | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	0	0	0
Commercial | Other
Schedule of Financing Receivables [Line Items]
All Past Due	795	7,779	803
Current	183,923	173,749	172,888
Total	184,718	181,528	173,691
90 Days or More & Accruing	0	0	0
Commercial | Other | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	459	542	29
Commercial | Other | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	42	6,663	259
Commercial | Other | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	294	574	515
Municipal
Schedule of Financing Receivables [Line Items]
All Past Due	0	0	0
Current	48,717	33,391	28,695
Total	48,717	33,391	28,695
90 Days or More & Accruing	0	0	0
Municipal | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	0	0	0
Municipal | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	0	0	0
Municipal | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	0	0	0
Residential | Construction
Schedule of Financing Receivables [Line Items]
All Past Due	0	471	99
Current	14,583	17,397	14,957
Total	14,583	17,868	15,056
90 Days or More & Accruing	0	0	0
Residential | Construction | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	0	101	99
Residential | Construction | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	0	370	0
Residential | Construction | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	0	0	0
Residential | Term
Schedule of Financing Receivables [Line Items]
All Past Due	4,275	7,659	5,383
Current	449,313	425,002	421,788
Total	453,588	432,661	427,171
90 Days or More & Accruing	0	436	0
Residential | Term | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	531	1,031	533
Residential | Term | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	2,014	4,372	3,343
Residential | Term | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	1,730	2,256	1,507
Home equity line of credit
Schedule of Financing Receivables [Line Items]
All Past Due	1,528	1,707	1,597
Current	106,138	109,595	108,731
Total	107,666	111,302	110,328
90 Days or More & Accruing	0	0	0
Home equity line of credit | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	915	537	440
Home equity line of credit | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	38	445	406
Home equity line of credit | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	575	725	751
Consumer
Schedule of Financing Receivables [Line Items]
All Past Due	125	186	429
Current	24,621	25,338	25,200
Total	24,746	25,524	25,629
90 Days or More & Accruing	3	9	29
Consumer | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	70	159	282
Consumer | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	37	18	118
Consumer | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	$ 18	$ 9	$ 29

Loans - Nonaccrual Loans (Detai

Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 14,381	$ 14,736	$ 7,434
Commercial | Real estate
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	981	752	1,814
Commercial | Construction
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	286	0	0
Commercial | Other
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	8,900	9,357	885
Municipal
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	0	0	0
Residential | Construction
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	0	0	0
Residential | Term
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	3,509	3,778	3,852
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	689	833	883
Consumer
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 16	$ 16	$ 0

Loans - Impaired Loans by Class

Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	$ 19,287	$ 19,536	$ 19,287	$ 19,536	$ 18,023
Recorded investment, with related allowance	12,905	7,108	12,905	7,108	13,369
Recorded Investment	32,192	26,644	32,192	26,644	31,392
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	20,983	21,503	20,983	21,503	19,775
Unpaid principal balance with related allowance	13,354	7,481	13,354	7,481	13,698
Unpaid Principal Balance	34,337	28,984	34,337	28,984	33,473
Related Allowance	2,205	594	2,205	594	1,812
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	18,854	19,512	18,433	19,666	19,227
Average recorded investment, with related allowance	13,112	7,431	13,110	7,581	9,881
Average Recorded Investment	31,966	26,943	31,543	27,247	29,108
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	162	138	308	288	553
Recognized interest income, with related allowance	52	77	115	150	231
Recognized Interest Income	214	215	423	438	784
Commercial | Real estate
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	5,438	5,686	5,438	5,686	3,791
Recorded investment, with related allowance	3,470	4,167	3,470	4,167	3,999
Recorded Investment	8,908	9,853	8,908	9,853	7,790
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	5,749	6,171	5,749	6,171	3,996
Unpaid principal balance with related allowance	3,488	4,356	3,488	4,356	4,116
Unpaid Principal Balance	9,237	10,527	9,237	10,527	8,112
Related Allowance	270	221	270	221	224
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	5,169	5,414	4,666	5,429	5,124
Average recorded investment, with related allowance	3,749	4,549	3,819	4,644	4,460
Average Recorded Investment	8,918	9,963	8,485	10,073	9,584
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	56	46	110	94	164
Recognized interest income, with related allowance	28	43	67	85	152
Recognized Interest Income	84	89	177	179	316
Commercial | Construction
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	1,027	0	1,027	0	741
Recorded investment, with related allowance	0	763	0	763	0
Recorded Investment	1,027	763	1,027	763	741
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	1,027	0	1,027	0	741
Unpaid principal balance with related allowance	0	763	0	763	0
Unpaid Principal Balance	1,027	763	1,027	763	741
Related Allowance	0	103	0	103	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	837	0	789	0	62
Average recorded investment, with related allowance	0	763	0	763	699
Average Recorded Investment	837	763	789	763	761
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	11	0	21	0	38
Recognized interest income, with related allowance	0	9	0	18	0
Recognized Interest Income	11	9	21	18	38
Commercial | Other
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	2,265	1,405	2,265	1,405	2,591
Recorded investment, with related allowance	7,174	228	7,174	228	7,327
Recorded Investment	9,439	1,633	9,439	1,633	9,918
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	2,349	1,449	2,349	1,449	2,671
Unpaid principal balance with related allowance	7,388	268	7,388	268	7,371
Unpaid Principal Balance	9,737	1,717	9,737	1,717	10,042
Related Allowance	1,647	36	1,647	36	1,309
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	2,272	1,418	2,287	1,507	1,908
Average recorded investment, with related allowance	7,170	230	7,176	177	2,584
Average Recorded Investment	9,442	1,648	9,463	1,684	4,492
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	11	12	17	19	36
Recognized interest income, with related allowance	0	4	0	6	0
Recognized Interest Income	11	16	17	25	36
Municipal
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	0	0	0	0	0
Recorded investment, with related allowance	0	0	0	0	0
Recorded Investment	0	0	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	0	0	0	0	0
Unpaid principal balance with related allowance	0	0	0	0	0
Unpaid Principal Balance	0	0	0	0	0
Related Allowance	0	0	0	0	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	0	0	0	0	0
Average recorded investment, with related allowance	0	0	0	0	0
Average Recorded Investment	0	0	0	0	0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	0	0	0	0	0
Recognized interest income, with related allowance	0	0	0	0	0
Recognized Interest Income	0	0	0	0	0
Residential | Construction
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	0	0	0	0	0
Recorded investment, with related allowance	0	0	0	0	0
Recorded Investment	0	0	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	0	0	0	0	0
Unpaid principal balance with related allowance	0	0	0	0	0
Unpaid Principal Balance	0	0	0	0	0
Related Allowance	0	0	0	0	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	0	0	0	0	0
Average recorded investment, with related allowance	0	0	0	0	0
Average Recorded Investment	0	0	0	0	0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	0	0	0	0	0
Recognized interest income, with related allowance	0	0	0	0	0
Recognized Interest Income	0	0	0	0	0
Residential | Term
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	9,613	11,065	9,613	11,065	9,769
Recorded investment, with related allowance	2,161	1,925	2,161	1,925	1,979
Recorded Investment	11,774	12,990	11,774	12,990	11,748
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	10,808	12,152	10,808	12,152	10,909
Unpaid principal balance with related allowance	2,378	2,067	2,378	2,067	2,144
Unpaid Principal Balance	13,186	14,219	13,186	14,219	13,053
Related Allowance	286	209	286	209	255
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	9,642	11,283	9,671	11,343	10,770
Average recorded investment, with related allowance	2,086	1,864	2,027	1,971	2,106
Average Recorded Investment	11,728	13,147	11,698	13,314	12,876
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	80	73	151	161	297
Recognized interest income, with related allowance	24	21	48	41	79
Recognized Interest Income	104	94	199	202	376
Home equity line of credit
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	928	1,380	928	1,380	1,115
Recorded investment, with related allowance	100	25	100	25	64
Recorded Investment	1,028	1,405	1,028	1,405	1,179
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	1,021	1,731	1,021	1,731	1,429
Unpaid principal balance with related allowance	100	27	100	27	67
Unpaid Principal Balance	1,121	1,758	1,121	1,758	1,496
Related Allowance	2	25	2	25	24
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	918	1,397	1,004	1,387	1,351
Average recorded investment, with related allowance	107	25	88	26	32
Average Recorded Investment	1,025	1,422	1,092	1,413	1,383
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	4	7	9	14	18
Recognized interest income, with related allowance	0	0	0	0	0
Recognized Interest Income	4	7	9	14	18
Consumer
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	16	0	16	0	16
Recorded investment, with related allowance	0	0	0	0	0
Recorded Investment	16	0	16	0	16
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	29	0	29	0	29
Unpaid principal balance with related allowance	0	0	0	0	0
Unpaid Principal Balance	29	0	29	0	29
Related Allowance	0	0	0	0	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	16	0	16	0	12
Average recorded investment, with related allowance	0	0	0	0	0
Average Recorded Investment	16	0	16	0	12
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	0	0	0	0	0
Recognized interest income, with related allowance	0	0	0	0	0
Recognized Interest Income	$ 0	$ 0	$ 0	$ 0	$ 0

Loans - TDR's by Class and Spec

Loans - TDR's by Class and Specific Reserves (Details) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2018USD ($)loan	Jun. 30, 2017USD ($)loan	Dec. 31, 2017USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	72	68	62
Balance	$ 25,606	$ 20,301	$ 17,801
Specific Reserves	$ 1,530	$ 406	$ 323
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	15	9	8
Balance	$ 8,026	$ 8,040	$ 7,038
Specific Reserves	$ 143	$ 93	$ 90
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	1	1
Balance	$ 741	$ 763	$ 741
Specific Reserves	$ 0	$ 103	$ 0
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	5	5	4
Balance	$ 7,071	$ 749	$ 561
Specific Reserves	$ 1,100	$ 1	$ 0
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0	0
Balance	$ 0	$ 0	$ 0
Specific Reserves	$ 0	$ 0	$ 0
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0	0
Balance	$ 0	$ 0	$ 0
Specific Reserves	$ 0	$ 0	$ 0
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	48	50	46
Balance	$ 9,263	$ 10,227	$ 8,948
Specific Reserves	$ 287	$ 209	$ 233
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	3	3	3
Balance	$ 505	$ 522	$ 513
Specific Reserves	$ 0	$ 0	$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0	0
Balance	$ 0	$ 0	$ 0
Specific Reserves	$ 0	$ 0	$ 0

Loans - TDR's by Class and Sp50

Loans - TDR's by Class and Specific Reserves More Than 30 Days Past Due (Details) $ in Thousands	Jun. 30, 2018USD ($)loan	Jun. 30, 2017USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	8	10
Balance	$ 893	$ 1,336
Specific Reserves	$ 33	$ 10
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	7	9
Balance	$ 726	$ 1,169
Specific Reserves	$ 33	$ 10
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	1
Balance	$ 167	$ 167
Specific Reserves	$ 0	$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	0	0
Balance	$ 0	$ 0
Specific Reserves	$ 0	$ 0

Loans - Pre-Modification and Po

Loans - Pre-Modification and Post-Modification Outstanding Recorded Investment (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)loan	Jun. 30, 2017loan	Jun. 30, 2018USD ($)loan	Jun. 30, 2017loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	3	0	10	0
Pre-Modification Outstanding Recorded Investment	$ 7,168		$ 8,224
Post-Modification Outstanding Recorded Investment	6,968		8,024
Specific Reserves	$ 1,126		$ 1,168
Commercial | Real estate
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0		7
Pre-Modification Outstanding Recorded Investment	$ 0		$ 1,056
Post-Modification Outstanding Recorded Investment	0		1,056
Specific Reserves	$ 0		$ 42
Commercial | Construction
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0		0
Pre-Modification Outstanding Recorded Investment	$ 0		$ 0
Post-Modification Outstanding Recorded Investment	0		0
Specific Reserves	$ 0		$ 0
Commercial | Other
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1		1
Pre-Modification Outstanding Recorded Investment	$ 6,727		$ 6,727
Post-Modification Outstanding Recorded Investment	6,532		6,532
Specific Reserves	$ 1,100		$ 1,100
Municipal
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0		0
Pre-Modification Outstanding Recorded Investment	$ 0		$ 0
Post-Modification Outstanding Recorded Investment	0		0
Specific Reserves	$ 0		$ 0
Residential | Construction
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0		0
Pre-Modification Outstanding Recorded Investment	$ 0		$ 0
Post-Modification Outstanding Recorded Investment	0		0
Specific Reserves	$ 0		$ 0
Residential | Term
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	2		2
Pre-Modification Outstanding Recorded Investment	$ 441		$ 441
Post-Modification Outstanding Recorded Investment	436		436
Specific Reserves	$ 26		$ 26
Home equity line of credit
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0		0
Pre-Modification Outstanding Recorded Investment	$ 0		$ 0
Post-Modification Outstanding Recorded Investment	0		0
Specific Reserves	$ 0		$ 0
Consumer
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0		0
Pre-Modification Outstanding Recorded Investment	$ 0		$ 0
Post-Modification Outstanding Recorded Investment	0		0
Specific Reserves	$ 0		$ 0

Allowance for Loan Losses - Nar

Allowance for Loan Losses - Narrative (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018USD ($)loan_class	Dec. 31, 2017USD ($)	Mar. 31, 2018USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of classes in the loan portfolio (loan class) | loan_class	8
Allowance for loan and lease losses (percent)	0.43%	0.45%
Allowance for loan and lease losses, period increase (decrease)	$ (30)
Allowance for loan losses	$ 11,472	$ 10,729	$ 10,957	$ 10,611	$ 10,367	$ 10,138
Allowance for loan losses as a percent of total loans	0.94%	0.92%		0.95%
Number of classes in the commercial loan portfolio (loan class) | loan_class	3
Residential loans typical loan to value range, maximum (percent)	80.00%
Construction loans accrual to company capital	32.50%
Constructions loan portfolio maximum to company capital	100.00%
Construction and non owner occupied commercial real estate	129.90%
Maximum loan portfolio to company capital	300.00%
Outstanding loans and commitments subject by independent consulting firm	60.00%
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 575	$ 545	$ 581	$ 529	$ 573	$ 559
Delinquent period before consumer loans charged off (days)	120 days
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent period before residential loans placed on non accrual status (days)	90 days
Delinquent period for loans charged off (days)	180 days
Delinquency period for loans charged off after receipt of notification from bankruptcy court (days)	60 days
Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 1,425	$ 642		$ 1,670
Total reserve allowance accounted for by loan loss allowances (percent)	12.40%	6.00%

Allowance for Loan Losses - Fin

Allowance for Loan Losses - Financing Receivable and Allowance Element by Class (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 11,472	$ 10,957	$ 10,729	$ 10,611	$ 10,367	$ 10,138
Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,205		1,812	594
General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,630		3,033	3,259
Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	5,212		5,242	5,088
Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,425		642	1,670
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,732	3,732	3,872	3,996	4,015	3,988
Commercial | Real estate | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	270		224	221
Commercial | Real estate | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,067		1,285	1,467
Commercial | Real estate | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,395		2,363	2,308
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	399	396	434	517	441	396
Commercial | Construction | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	103
Commercial | Construction | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	123		153	161
Commercial | Construction | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	276		281	253
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,475	3,540	3,358	2,171	1,925	1,780
Commercial | Other | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,647		1,309	36
Commercial | Other | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	563		723	829
Commercial | Other | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,265		1,326	1,306
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	21	21	20	19	18	18
Municipal | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Municipal | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Municipal | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	21		20	19
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	29	31	36	26	24	44
Residential | Construction | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Residential | Construction | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	10		13	8
Residential | Construction | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	19		23	18
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,138	1,129	1,130	999	969	1,288
Residential | Term | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	286		255	209
Residential | Term | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	311		311	249
Residential | Term | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	541		564	541
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	678	716	692	684	811	807
Home equity line of credit | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2		24	25
Home equity line of credit | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	287		297	300
Home equity line of credit | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	389		371	359
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	575	581	545	529	573	559
Consumer | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Consumer | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	269		251	245
Consumer | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	306		294	284
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,425	$ 811	642	1,670	$ 1,591	$ 1,258
Unallocated | Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 1,425		$ 642	$ 1,670

Allowance for Loan Losses - Ris

Allowance for Loan Losses - Risk Ratings by Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	$ 623,857	$ 576,784	$ 542,481
1 Strong
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	1,404	1,586	1,006
2 Above Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	62,940	51,023	49,377
3 Satisfactory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	117,744	115,624	140,201
4 Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	297,572	280,762	242,212
5 Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	107,668	88,300	72,444
6 OAEM
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	2,783	6,207	7,203
7 Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	33,623	33,159	29,915
8 Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	123	123	123
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	350,114	323,809	306,490
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	40,308	38,056	33,605
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	184,718	181,528	173,691
Commercial | 1 Strong | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	2
Commercial | 1 Strong | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Commercial | 1 Strong | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	1,404	1,586	1,004
Commercial | 2 Above Average | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	12,404	12,534	13,737
Commercial | 2 Above Average | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	39	40	45
Commercial | 2 Above Average | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	5,500	5,776	7,700
Commercial | 3 Satisfactory | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	73,164	73,899	84,550
Commercial | 3 Satisfactory | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	3,027	2,856	2,827
Commercial | 3 Satisfactory | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	40,950	38,151	52,024
Commercial | 4 Average | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	195,119	173,956	140,826
Commercial | 4 Average | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	18,081	22,446	20,849
Commercial | 4 Average | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	81,255	84,360	80,537
Commercial | 5 Watch | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	50,088	41,652	46,158
Commercial | 5 Watch | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	18,875	12,714	9,884
Commercial | 5 Watch | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	38,705	33,934	16,402
Commercial | 6 OAEM | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	1,410	3,442	3,283
Commercial | 6 OAEM | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Commercial | 6 OAEM | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	1,373	2,765	3,920
Commercial | 7 Substandard | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	17,806	18,203	17,811
Commercial | 7 Substandard | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	286	0	0
Commercial | 7 Substandard | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	15,531	14,956	12,104
Commercial | 8 Doubtful | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	123	123	123
Commercial | 8 Doubtful | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Commercial | 8 Doubtful | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	48,717	33,391	28,695
Municipal | 1 Strong
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Municipal | 2 Above Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	44,997	32,673	27,895
Municipal | 3 Satisfactory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	603	718	800
Municipal | 4 Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	3,117	0	0
Municipal | 5 Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Municipal | 6 OAEM
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Municipal | 7 Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
Municipal | 8 Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	$ 0	$ 0	$ 0

Allowance for Loan Losses - All

Allowance for Loan Losses - Allowance for Loan Loss Activity by Class (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 10,957	$ 10,367	$ 10,729	$ 10,138	$ 10,138
Charge offs	55	290	373	617	1,618
Recoveries	70	34	116	90	209
Provision for loan losses	500	500	1,000	1,000	2,000
Ending balance	11,472	10,611	11,472	10,611	10,729
Ending balance specifically evaluated for impairment	2,205	594	2,205	594	1,812
Ending balance collectively evaluated for impairment	9,267	10,017	9,267	10,017	8,917
Total	1,224,440	1,120,665	1,224,440	1,120,665	1,164,139
Ending balance specifically evaluated for impairment	32,192	26,644	32,192	26,644	31,392
Ending balance collectively evaluated for impairment	1,192,248	1,094,021	1,192,248	1,094,021	1,132,747
Commercial | Real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,732	4,015	3,872	3,988	3,988
Charge offs	0	141	0	305	587
Recoveries	0	0	0	0	0
Provision for loan losses	0	122	(140)	313	471
Ending balance	3,732	3,996	3,732	3,996	3,872
Ending balance specifically evaluated for impairment	270	221	270	221	224
Ending balance collectively evaluated for impairment	3,462	3,775	3,462	3,775	3,648
Total	350,114	306,490	350,114	306,490	323,809
Ending balance specifically evaluated for impairment	8,908	9,853	8,908	9,853	7,790
Ending balance collectively evaluated for impairment	341,206	296,637	341,206	296,637	316,019
Commercial | Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	396	441	434	396	396
Charge offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Provision for loan losses	3	76	(35)	121	38
Ending balance	399	517	399	517	434
Ending balance specifically evaluated for impairment	0	103	0	103	0
Ending balance collectively evaluated for impairment	399	414	399	414	434
Total	40,308	33,605	40,308	33,605	38,056
Ending balance specifically evaluated for impairment	1,027	763	1,027	763	741
Ending balance collectively evaluated for impairment	39,281	32,842	39,281	32,842	37,315
Commercial | Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,540	1,925	3,358	1,780	1,780
Charge offs	0	58	17	58	212
Recoveries	4	7	10	18	49
Provision for loan losses	(69)	297	124	431	1,741
Ending balance	3,475	2,171	3,475	2,171	3,358
Ending balance specifically evaluated for impairment	1,647	36	1,647	36	1,309
Ending balance collectively evaluated for impairment	1,828	2,135	1,828	2,135	2,049
Total	184,718	173,691	184,718	173,691	181,528
Ending balance specifically evaluated for impairment	9,439	1,633	9,439	1,633	9,918
Ending balance collectively evaluated for impairment	175,279	172,058	175,279	172,058	171,610
Municipal
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	21	18	20	18	18
Charge offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Provision for loan losses	0	1	1	1	2
Ending balance	21	19	21	19	20
Ending balance specifically evaluated for impairment	0	0	0	0	0
Ending balance collectively evaluated for impairment	21	19	21	19	20
Total	48,717	28,695	48,717	28,695	33,391
Ending balance specifically evaluated for impairment	0	0	0	0	0
Ending balance collectively evaluated for impairment	48,717	28,695	48,717	28,695	33,391
Residential | Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	31	24	36	44	44
Charge offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Provision for loan losses	(2)	2	(7)	(18)	(8)
Ending balance	29	26	29	26	36
Ending balance specifically evaluated for impairment	0	0	0	0	0
Ending balance collectively evaluated for impairment	29	26	29	26	36
Total	14,583	15,056	14,583	15,056	17,868
Ending balance specifically evaluated for impairment	0	0	0	0	0
Ending balance collectively evaluated for impairment	14,583	15,056	14,583	15,056	17,868
Residential | Term
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,129	969	1,130	1,288	1,288
Charge offs	15	17	96	70	456
Recoveries	38	5	42	19	40
Provision for loan losses	(14)	42	62	(238)	258
Ending balance	1,138	999	1,138	999	1,130
Ending balance specifically evaluated for impairment	286	209	286	209	255
Ending balance collectively evaluated for impairment	852	790	852	790	875
Total	453,588	427,171	453,588	427,171	432,661
Ending balance specifically evaluated for impairment	11,774	12,990	11,774	12,990	11,748
Ending balance collectively evaluated for impairment	441,814	414,181	441,814	414,181	420,913
Home equity line of credit
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	716	811	692	807	807
Charge offs	0	21	115	28	28
Recoveries	2	3	13	3	11
Provision for loan losses	(40)	(109)	88	(98)	(98)
Ending balance	678	684	678	684	692
Ending balance specifically evaluated for impairment	2	25	2	25	24
Ending balance collectively evaluated for impairment	676	659	676	659	668
Total	107,666	110,328	107,666	110,328	111,302
Ending balance specifically evaluated for impairment	1,028	1,405	1,028	1,405	1,179
Ending balance collectively evaluated for impairment	106,638	108,923	106,638	108,923	110,123
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	581	573	545	559	559
Charge offs	40	53	145	156	335
Recoveries	26	19	51	50	109
Provision for loan losses	8	(10)	124	76	212
Ending balance	575	529	575	529	545
Ending balance specifically evaluated for impairment	0	0	0	0	0
Ending balance collectively evaluated for impairment	575	529	575	529	545
Total	24,746	25,629	24,746	25,629	25,524
Ending balance specifically evaluated for impairment	16	0	16	0	16
Ending balance collectively evaluated for impairment	24,730	25,629	24,730	25,629	25,508
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	811	1,591	642	1,258	1,258
Charge offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Provision for loan losses	614	79	783	412	(616)
Ending balance	1,425	1,670	1,425	1,670	642
Ending balance specifically evaluated for impairment	0	0	0	0	0
Ending balance collectively evaluated for impairment	1,425	1,670	1,425	1,670	642
Total	0	0	0	0	0
Ending balance specifically evaluated for impairment	0	0	0	0	0
Ending balance collectively evaluated for impairment	$ 0	$ 0	$ 0	$ 0	$ 0

Stock-Based Compensation - Narr

Stock-Based Compensation - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended		90 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share based compensation cost	$ 1,489		$ 1,489
Compensation expense recognized	190	$ 166
Share-based compensation expense not yet recognized	$ 869	$ 828	$ 869
Plan 2,010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Capital shares reserved for future issuance (in shares)				400,000
Plan 2010 | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants during the period (in shares)			144,355
Shares	67,689		67,689

Stock-Based Compensation - Shar

Stock-Based Compensation - Shares of Restricted Stock Granted under 2010 Plan (Details) - Plan 2010 - Restricted Stock - shares	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares	67,689
Remaining Term (In Years)	2 years 3 months 18 days
2014 | Five Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)					5 years
Shares	10,422
Remaining Term (In Years)					7 months 6 days
2015 | Five Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)				5 years
Shares	12,023
Remaining Term (In Years)				1 year 7 months 6 days
2016 | Five Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)			5 years
Shares	15,015
Remaining Term (In Years)			2 years 6 months
2017 | Five Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)		5 years
Shares	9,972
Remaining Term (In Years)		3 years 6 months
2017 | Three Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)		3 years
Shares	4,902
Remaining Term (In Years)		1 year 7 months 6 days
2018 | Five Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)	5 years
Shares	9,655
Remaining Term (In Years)	4 years 6 months
2018 | Three Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)	3 years
Shares	2,400
Remaining Term (In Years)	2 years 7 months 6 days
2018 | One Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)	1 year
Shares	300
Remaining Term (In Years)	7 months 6 days
2018 | Two Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)	2 years
Shares	932
Remaining Term (In Years)	1 year 6 months
2018 | Four Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)	4 years
Shares	2,068
Remaining Term (In Years)	3 years 6 months

Preferred and Common Stock (Det

Preferred and Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	Jan. 09, 2009	Nov. 30, 2016	Jun. 30, 2018	Jun. 30, 2017	May 31, 2015
Class of Stock [Line Items]
Number of shares of common stock issuable pursuant to the Warrants, maximum (in shares)	225,904				226,819
Exercise price of the Warrants (in dollars per share)	$ 16.60				$ 16.53
Term of warrants (years)	10 years
Repurchase of warrants		$ 1,750
Proceeds from sale of common stock			$ 310	$ 329
Capital Purchase Program
Class of Stock [Line Items]
Proceeds from sale of common stock			$ 310	$ 329
Series A Preferred Stock
Class of Stock [Line Items]
Proceeds from issuance of CPP Shares	$ 25,000

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income (Numerator) [Abstract]
Net income as reported	$ 5,734	$ 4,883	$ 11,240	$ 9,520
Basic EPS: Income available to common shareholders	5,734	4,883	11,240	9,520
Diluted EPS: Income available to common shareholders plus assumed conversions	$ 5,734	$ 4,883	$ 11,240	$ 9,520
Shares (Denominator) [Abstract]
Basic EPS: Income available to common shareholders (in shares)	10,779,275	10,746,363	10,776,680	10,740,355
Effect of dilutive securities: restricted stock (in shares)	70,443	71,086	70,443	72,348
Diluted EPS: Income available to common shareholders plus assumed conversions (in shares)	10,849,718	10,817,449	10,847,123	10,812,703
Per-Share Amount [Abstract]
Basic EPS: Income available to common shareholders (in dollars per share)	$ 0.53	$ 0.45	$ 1.04	$ 0.89
Diluted EPS: Income available to common shareholders plus assumed conversions (in dollars per share)	$ 0.53	$ 0.45	$ 1.04	$ 0.88

Employee Benefit Plans - Narrat

Employee Benefit Plans - Narrative (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2016USD ($)	Jun. 30, 2018USD ($)post_retirement_benefit_planemployee	Jun. 30, 2017USD ($)	Dec. 31, 2017USD ($)
Retirement Benefits, Description [Abstract]
Requisite period of service (months)		3 months
Defined contribution plan employer maximum percentage match of annual salary based on employee contribution		3.00%
Defined contribution plan employer maximum percentage of annual profit-sharing contribution to plan for benefit of employee				2.00%
Expense related to 401(k) plan		$ 288,000	$ 243,000
Unfunded, supplemental retirement benefits payable period (years)		20 years
Pension expense	$ 108,000	$ 86,000	108,000
Accrued pension liability		$ 3,003,000	$ 3,042,000	$ 3,060,000
Number of post retirement benefit plans (post retirement benefit plan) | post_retirement_benefit_plan		2
Number of employees currently eligible (employee) | employee		6
Requisite age (in years)		50 years
Post-retirement benefit plan health insurance subsidy range minimum per month per person		$ 40
Post-retirement benefit plan health insurance subsidy range maximum per month per person		$ 1,200
Discount rate		4.25%
Assumed health care cost trend rate		7.00%
Expected future benefit payments, current year		$ 128,000
Estimated plan expense		77,000
Effect of one percentage point increase on accumulated benefit obligation		100,000
Effect of one percentage point increase on interest cost		7,000
Effect of one percentage point increase on service cost		$ 1,000

Employee Benefit Plans - Accumu

Employee Benefit Plans - Accumulated Post-Retirement Benefit Obligation, Funded Status, and Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Change in benefit obligation
Benefit obligation at beginning of year			$ 1,874	$ 1,870
Interest cost	$ 19	$ 19	38	38
Benefits paid			(56)	(64)
Benefit obligation at end of period	1,856	1,844	1,856	1,844
Funded status
Benefit obligation at end of period	(1,856)	(1,844)	(1,874)	(1,870)	$ (1,856)	$ (1,844)
Unamortized loss					186	102
Accrued benefit cost at end of period					$ (1,670)	$ (1,742)
Components of net periodic benefit cost
Interest cost	19	19	38	38
Net periodic benefit cost	$ 19	$ 19	$ 38	$ 38

Employee Benefit Plans - Schedu

Employee Benefit Plans - Schedule of Net Periodic Benefit Cost Not Yet Recognized (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Retirement Benefits, Description [Abstract]
Unamortized net actuarial loss	$ (186)	$ (156)	$ (186)
Deferred tax benefit at 21% (for June 30, 2018 and December 31, 2017) and 35% (for June 30, 2017)	39	54	39
Net unrecognized postretirement benefits included in accumulated other comprehensive income (loss)	$ (147)	$ (102)	$ (147)
Deferred tax benefit, percentage	21.00%	35.00%	21.00%

Other Comprehensive Income (L63

Other Comprehensive Income (Loss) - Summary of Available for Sale Securities Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance			$ 181,321	$ 172,521
Other comprehensive income (loss)	$ (904)	$ 174	(3,837)	234
Ending balance	183,304	177,537	183,304	177,537
Accumulated Net Investment Gain (Loss) Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(6,210)	(934)	(2,901)	(935)
Unrealized gains (losses) arising during the period	(1,311)	536	(5,363)	541
Reclassification of realized gains during the period	0	0	(136)	(3)
Related deferred taxes (at a Federal Income Tax rate of 21% for June 30, 2018 and 35% for June 30, 2017)	276	(187)	1,155	(188)
Other comprehensive income (loss)	(1,035)	349	(4,344)	350
Ending balance	$ (7,245)	$ (585)	$ (7,245)	$ (585)

Other Comprehensive Income (L64

Other Comprehensive Income (Loss) - Reclassification of Available-for-Sale Securities to Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reclassification of Available-for-Sale Securities to Held-to-maturity Roll Forward [Roll Forward]
Beginning balance			$ 181,321	$ 172,521
Other comprehensive income (loss)	$ (904)	$ 174	(3,837)	234
Ending balance	183,304	177,537	183,304	177,537
Accumulated Net Gain (Loss) on Securities Transferred from Available-for-Sale to Held-to-Maturity
Reclassification of Available-for-Sale Securities to Held-to-maturity Roll Forward [Roll Forward]
Beginning balance	(182)	(133)	(174)	(129)
Amortization of net unrealized losses	(9)	(6)	(19)	(12)
Related deferred taxes (at a Federal Income Tax rate of 21% for June 30, 2018 and 35% for June 30, 2017)	2	2	4	4
Other comprehensive income (loss)	(7)	(4)	(15)	(8)
Ending balance	$ (189)	$ (137)	$ (189)	$ (137)

Other Comprehensive Income (L65

Other Comprehensive Income (Loss) - Derivative Instruments Included in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance			$ 181,321	$ 172,521
Other comprehensive income (loss)	$ (904)	$ 174	(3,837)	234
Ending balance	183,304	177,537	183,304	177,537
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,928	1,226	1,544	1,163
Unrealized gains (losses) arising during the period	175	(263)	661	(167)
Related deferred taxes (at a Federal Income Tax rate of 21% for June 30, 2018 and 35% for June 30, 2017)	(37)	92	(139)	59
Other comprehensive income (loss)	138	(171)	522	(108)
Ending balance	$ 2,066	$ 1,055	$ 2,066	$ 1,055

Other Comprehensive Income (L66

Other Comprehensive Income (Loss) - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance			$ 181,321	$ 172,521
Ending balance	$ 183,304	$ 177,537	183,304	177,537
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	(147)	(102)	(147)	(102)
Amortization of unrecognized transition obligation	0	0	0	0
Change in unamortized net actuarial gain (loss)	0	0	0	0
Related deferred taxes (at a Federal Income Tax rate of 21% for June 30, 2018 and 35% for June 30, 2017)	0	0	0	0
Ending balance	$ (147)	$ (102)	$ (147)	$ (102)

Financial Derivative Instrume67

Financial Derivative Instruments (Details) - Cash Flow Hedging - Designated as Hedging Instrument - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Interest Rate Swap June 28 2021
Derivative [Line Items]
Notional Amount	$ 30,000,000
Fixed Rate Paid	0.94%
Fair Value	$ 1,521,000	$ 1,154,000	$ 952,000
Interest Rate Swap June 27 2021
Derivative [Line Items]
Notional Amount	$ 20,000,000
Fixed Rate Paid	0.893%
Fair Value	$ 1,041,000	801,000	671,000
Interest Rate Swap December 5 2019
Derivative [Line Items]
Notional Amount	$ 25,000,000
Fixed Rate Paid	2.466%
Fair Value	$ 11,000	0	0
Interest Rate Swap June 5 2020
Derivative [Line Items]
Notional Amount	$ 25,000,000
Fixed Rate Paid	2.547%
Fair Value	$ 19,000	0	0
Interest Rate Swap December 5 2020
Derivative [Line Items]
Notional Amount	$ 25,000,000
Fixed Rate Paid	2.603%
Fair Value	$ 24,000	0	0
Interest Rate Swap
Derivative [Line Items]
Notional Amount	125,000,000
Fair Value	$ 2,616,000	$ 1,955,000	$ 1,623,000

Mortgage Servicing Rights - Nar

Mortgage Servicing Rights - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Transfers and Servicing [Abstract]
Moving average of weekly prepayment assumption (months)			3 months
Prepayment speed			7.56%
Discount rate adjustment rate			9.50%
Servicing rights capitalized	$ 119	$ 339
Servicing rights amortized			$ 102	$ 274
Mortgage servicing rights	2,581	1,888	2,581	1,888	$ 2,321
Residential mortgage loans serviced for others, principal	$ 259,105	$ 252,152	$ 259,105	$ 252,152	$ 260,258

Mortgage Servicing Rights - Sch

Mortgage Servicing Rights - Schedule of Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Transfers and Servicing [Abstract]
Mortgage servicing rights	$ 5,546	$ 5,428	$ 5,199
Accumulated amortization	(4,261)	(4,160)	(4,072)
Impairment reserve	0	0	(18)
Total servicing asset at fair value	$ 1,285	$ 1,268	$ 1,109

Certificates of Deposit (Detail

Certificates of Deposit (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Banking and Thrift [Abstract]
Certificates of deposit of less than $100,000	$ 400,680	$ 284,066	$ 270,875
Certificates $100,000 to $250,000	204,311	232,759	212,063
Certificates $250,000 and over	52,400	42,176	44,556
Total certificates of deposit	$ 657,391	$ 559,001	$ 527,494

Fair Value - Assets Recorded at

Fair Value - Assets Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		$ 300,172	$ 308,146
Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		289,989	288,991
Debt Securities, Available-for-sale	$ 297,378
State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		6,769	15,828
Debt Securities, Available-for-sale	4,692
Other equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		3,414	3,327
Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		300,172	308,146
Debt Securities, Available-for-sale	305,048
Derivative asset	2,616	1,955	1,623
Total Fair Value | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		0	0
Debt Securities, Available-for-sale	0
Derivative asset	0	0	0
Total Fair Value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		300,172	308,146
Debt Securities, Available-for-sale	305,048
Derivative asset	2,616	1,955	1,623
Total Fair Value | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		0	0
Debt Securities, Available-for-sale	0
Derivative asset	0	0	0
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		0	0
Debt Securities, Available-for-sale	0
Total assets	0	0	0
Fair Value, Measurements, Recurring | Level 1 | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0	0
Fair Value, Measurements, Recurring | Level 1 | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		0	0
Debt Securities, Available-for-sale	0
Fair Value, Measurements, Recurring | Level 1 | State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		0	0
Debt Securities, Available-for-sale	0
Fair Value, Measurements, Recurring | Level 1 | Other equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		0	0
Debt Securities, Available-for-sale	0
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		300,172	308,146
Debt Securities, Available-for-sale	305,048
Total assets	307,664	302,127	309,769
Fair Value, Measurements, Recurring | Level 2 | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	2,616	1,955	1,623
Fair Value, Measurements, Recurring | Level 2 | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		289,989	288,991
Debt Securities, Available-for-sale	297,378
Fair Value, Measurements, Recurring | Level 2 | State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		6,769	15,828
Debt Securities, Available-for-sale	4,692
Fair Value, Measurements, Recurring | Level 2 | Other equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		3,414	3,327
Debt Securities, Available-for-sale	2,978
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		0	0
Debt Securities, Available-for-sale	0
Total assets	0	0	0
Fair Value, Measurements, Recurring | Level 3 | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	0	0	0
Fair Value, Measurements, Recurring | Level 3 | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		0	0
Debt Securities, Available-for-sale	0
Fair Value, Measurements, Recurring | Level 3 | State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		0	0
Debt Securities, Available-for-sale	0
Fair Value, Measurements, Recurring | Level 3 | Other equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		0	0
Debt Securities, Available-for-sale	0
Fair Value, Measurements, Recurring | Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		300,172	308,146
Debt Securities, Available-for-sale	305,048
Total assets	307,664	302,127	309,769
Fair Value, Measurements, Recurring | Total Fair Value | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	2,616	1,955	1,623
Fair Value, Measurements, Recurring | Total Fair Value | Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		289,989	288,991
Debt Securities, Available-for-sale	297,378
Fair Value, Measurements, Recurring | Total Fair Value | State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		6,769	15,828
Debt Securities, Available-for-sale	4,692
Fair Value, Measurements, Recurring | Total Fair Value | Other equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale		$ 3,414	$ 3,327
Debt Securities, Available-for-sale	$ 2,978

Fair Value - Additional Informa

Fair Value - Additional Information (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Valuation allowance on real estate owned	$ 0	$ 53,000	$ 39,000
Valuation allowance on impaired financing receivable	$ 1,893,000	$ 1,531,000	$ 202,000

Fair Value - Assets Recorded 73

Fair Value - Assets Recorded at Fair Value on a Non-Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$ 609	$ 1,012	$ 324
Fair Value, Measurements, Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	0	0	0
Impaired loans	0	0	0
Total assets	0	0	0
Fair Value, Measurements, Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	609	1,012	324
Impaired loans	6,387	6,521	269
Total assets	6,996	7,533	593
Fair Value, Measurements, Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	0	0	0
Impaired loans	0	0	0
Total assets	0	0	0
Fair Value, Measurements, Nonrecurring | Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	609	1,012	324
Impaired loans	6,387	6,521	269
Total assets	$ 6,996	$ 7,533	$ 593

Fair Value - Assets and Liabili

Fair Value - Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, carrying value	$ 21,056	$ 19,207	$ 20,189	$ 17,366
Interest bearing deposits in other banks	1,616	860	3,820
Fair Value (Estimated)		300,172	308,146
Securities to be held to maturity, carrying value	260,077	256,567	244,123
Securities to be held to maturity	256,316	259,655	246,238
Restricted equity securities	12,363	10,358	12,311
Loans held for sale, carrying value	481	386	865
Mortgage servicing rights	2,581	2,321	1,888
Demand deposits	146,964	145,332	137,061
NOW deposits	282,449	318,043	293,553
Money market deposits	100,378	163,898	134,760
Savings deposits	229,464	232,605	226,391
Total deposits	1,416,646	1,418,879	1,319,259
Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, carrying value	21,056	19,207	20,189
Interest bearing deposits in other banks	1,616	860	3,820
Fair Value (Estimated)		300,172	308,146
Securities available for sale	305,048
Securities to be held to maturity, carrying value	260,077	256,567	244,123
Restricted equity securities	12,363	10,358	12,311
Loans held for sale, carrying value	481	386	865
Loans	1,212,968	1,153,410	1,110,054
Mortgage servicing rights, carrying value	1,285	1,268	1,109
Interest rate swap agreements	2,616	1,955	1,623
Accrued interest receivable	7,723	5,867	7,192
Demand deposits	146,964	145,332	137,061
NOW deposits	282,449	318,043	293,553
Money market deposits	100,378	163,898	134,760
Savings deposits	229,464	232,605	226,391
Local certificates of deposit	267,932	223,074	217,495
National certificates of deposit	389,459	335,927	309,999
Total deposits	1,416,646	1,418,879	1,319,259
Repurchase agreements	91,764	70,564	67,154
Federal Home Loan Bank advances	205,691	158,194	215,123
Total borrowed funds	297,455	228,758	282,277
Accrued interest payable	943	642	603
Carrying value | Commercial | Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	345,853	319,691	301,722
Carrying value | Commercial | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	39,852	37,594	32,989
Carrying value | Commercial | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	180,750	177,956	171,099
Carrying value | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	48,693	33,370	28,672
Carrying value | Residential | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	14,550	17,830	15,025
Carrying value | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	452,289	431,459	425,985
Carrying value | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	106,892	110,566	109,516
Carrying value | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	24,089	24,944	25,046
Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	21,056	19,207	20,189
Interest bearing deposits in other banks	1,616	860	3,820
Fair Value (Estimated)		300,172	308,146
Securities available for sale	305,048
Securities to be held to maturity	256,316	259,655	246,238
Restricted equity securities	12,363	10,358	12,311
Loans held for sale	481	386	865
Loans	1,188,573	1,138,727	1,102,089
Mortgage servicing rights	2,581	2,321	1,888
Interest rate swap agreements	2,616	1,955	1,623
Accrued interest receivable	7,723	5,867	7,192
Demand deposits	136,167	139,350	133,002
NOW deposits	254,619	295,775	274,476
Money market deposits	93,978	153,497	126,402
Savings deposits	194,141	203,799	200,712
Local certificates of deposit	263,342	220,734	217,021
National certificates of deposit	389,062	335,775	309,853
Total deposits	1,331,309	1,348,930	1,261,466
Repurchase agreements	88,560	67,976	64,852
Federal Home Loan Bank advances	204,476	156,396	214,893
Total borrowed funds	293,036	224,372	279,745
Accrued interest payable	943	642	603
Total Fair Value | Commercial | Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	338,784	311,321	295,339
Total Fair Value | Commercial | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	39,037	36,610	32,291
Total Fair Value | Commercial | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	178,904	175,455	169,509
Total Fair Value | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	47,790	33,280	28,902
Total Fair Value | Residential | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	14,443	17,613	14,983
Total Fair Value | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	441,029	431,028	428,556
Total Fair Value | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	105,264	109,012	107,855
Total Fair Value | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	23,322	24,408	24,654
Total Fair Value | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	21,056	19,207	20,189
Interest bearing deposits in other banks	1,616	860	3,820
Fair Value (Estimated)		0	0
Securities available for sale	0
Securities to be held to maturity	0	0	0
Restricted equity securities	0	0	0
Loans held for sale	0	0	0
Loans	0	0	0
Mortgage servicing rights	0	0	0
Interest rate swap agreements	0	0	0
Accrued interest receivable	0	0	0
Demand deposits	0	0	0
NOW deposits	0	0	0
Money market deposits	0	0	0
Savings deposits	0	0	0
Local certificates of deposit	0	0	0
National certificates of deposit	0	0	0
Total deposits	0	0	0
Repurchase agreements	0	0	0
Federal Home Loan Bank advances	0	0	0
Total borrowed funds	0	0	0
Accrued interest payable	0	0	0
Total Fair Value | Level 1 | Commercial | Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 1 | Commercial | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 1 | Commercial | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 1 | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 1 | Residential | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 1 | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 1 | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 1 | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0	0
Interest bearing deposits in other banks	0	0	0
Fair Value (Estimated)		300,172	308,146
Securities available for sale	305,048
Securities to be held to maturity	256,316	259,655	246,238
Restricted equity securities	12,363	10,358	12,311
Loans held for sale	481	386	865
Loans	6,387	6,521	269
Mortgage servicing rights	2,581	2,321	1,888
Interest rate swap agreements	2,616	1,955	1,623
Accrued interest receivable	7,723	5,867	7,192
Demand deposits	136,167	139,350	133,002
NOW deposits	254,619	295,775	274,476
Money market deposits	93,978	153,497	126,402
Savings deposits	194,141	203,799	200,712
Local certificates of deposit	263,342	220,734	217,021
National certificates of deposit	389,062	335,775	309,853
Total deposits	1,331,309	1,348,930	1,261,466
Repurchase agreements	88,560	67,976	64,852
Federal Home Loan Bank advances	204,476	156,396	214,893
Total borrowed funds	293,036	224,372	279,745
Accrued interest payable	943	642	603
Total Fair Value | Level 2 | Commercial | Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	423	72	0
Total Fair Value | Level 2 | Commercial | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 2 | Commercial | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	5,527	6,018	33
Total Fair Value | Level 2 | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 2 | Residential | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 2 | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	339	391	236
Total Fair Value | Level 2 | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	98	40	0
Total Fair Value | Level 2 | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0	0
Interest bearing deposits in other banks	0	0	0
Fair Value (Estimated)		0	0
Securities available for sale	0
Securities to be held to maturity	0	0	0
Restricted equity securities	0	0	0
Loans held for sale	0	0	0
Loans	1,182,186	1,132,206	1,101,820
Mortgage servicing rights	0	0	0
Interest rate swap agreements	0	0	0
Accrued interest receivable	0	0	0
Demand deposits	0	0	0
NOW deposits	0	0	0
Money market deposits	0	0	0
Savings deposits	0	0	0
Local certificates of deposit	0	0	0
National certificates of deposit	0	0	0
Total deposits	0	0	0
Repurchase agreements	0	0	0
Federal Home Loan Bank advances	0	0	0
Total borrowed funds	0	0	0
Accrued interest payable	0	0	0
Total Fair Value | Level 3 | Commercial | Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	338,361	311,249	295,339
Total Fair Value | Level 3 | Commercial | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	39,037	36,610	32,291
Total Fair Value | Level 3 | Commercial | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	173,377	169,437	169,476
Total Fair Value | Level 3 | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	47,790	33,280	28,902
Total Fair Value | Level 3 | Residential | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	14,443	17,613	14,983
Total Fair Value | Level 3 | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	440,690	430,637	428,320
Total Fair Value | Level 3 | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	105,166	108,972	107,855
Total Fair Value | Level 3 | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 23,322	$ 24,408	$ 24,654

Impact of Recently Issued Acc75

Impact of Recently Issued Accounting Standards (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)
Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification adjustment for effect of enacted tax law changes	$ 297