The First Bancorp, Inc. (FNLC) 10-Q 9 May 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	May 01, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	First Bancorp, Inc /ME/
Entity Central Index Key	0000765207
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		10,887,552
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Entity Emerging Growth Company	false
Entity Small Business	false

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Assets
Cash and cash equivalents	$ 15,270	$ 19,134	$ 16,559
Interest bearing deposits in other banks	231	12,079	280
Securities available for sale	325,276	317,416
Securities available for sale			300,839
Securities to be held to maturity (fair value of $282,568,000 at March 31, 2019, $250,900,000 at December 31, 2018 and $255,851,000 at March 31, 2018)	281,219	255,663	258,690
Restricted equity securities, at cost	8,982	11,586	11,947
Loans held for sale	436	0	284
Loans	1,264,639	1,238,283	1,188,002
Less allowance for loan losses	11,490	11,232	10,957
Net loans	1,253,149	1,227,051	1,177,045
Accrued interest receivable	9,307	6,660	7,222
Premises and equipment, net	21,767	22,056	22,043
Other real estate owned	584	584	1,121
Goodwill	29,805	29,805	29,805
Other assets	45,319	42,536	45,980
Total assets	1,991,345	1,944,570	1,871,815
Liabilities
Demand deposits	148,500	163,575	137,674
NOW deposits	371,305	382,923	314,587
Money market deposits	137,700	152,043	108,726
Savings deposits	236,894	237,135	232,458
Certificates of deposit	712,476	591,409	634,747
Total certificates of deposits	1,606,875	1,527,085	1,428,192
Borrowed funds – short term	160,309	145,205	129,112
Borrowed funds – long term	10,110	65,112	115,117
Other liabilities	16,264	15,626	18,022
Total liabilities	1,793,558	1,753,028	1,690,443
Shareholders' equity
Common stock, one cent par value per share	109	109	108
Additional paid-in capital	63,037	62,746	61,999
Retained earnings	135,364	132,460	123,876
Accumulated other comprehensive income (loss)
Net unrealized loss on securities available for sale	(1,539)	(5,051)	(6,210)
Net unrealized loss on securities transferred from available for sale to held to maturity	(194)	(197)	(182)
Net unrealized gain on cash flow hedging derivative instruments	973	1,438	1,928
Net unrealized gain (loss) on postretirement benefit costs	37	37	(147)
Total shareholders' equity	197,787	191,542	181,372
Total liabilities & shareholders' equity	$ 1,991,345	$ 1,944,570	$ 1,871,815
Common Stock
Number of shares authorized (in shares)	18,000,000	18,000,000	18,000,000
Number of shares issued and outstanding (in shares)	10,884,381	10,862,651	10,846,562
Book value per common share (usd per share)	$ 18.17	$ 17.63	$ 16.72
Tangible book value per common share (usd per share)	$ 15.42	$ 14.87	$ 13.95

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Assets
Securities to be held to maturity, fair value	$ 282,568	$ 250,900	$ 255,851

Consolidated Statements of Inco

Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Interest income
Interest and fees on loans (includes tax-exempt income of $358,000 as of March 31, 2019 and $211,000 as of March 31, 2018)	$ 14,557	$ 12,391
Interest on deposits with other banks	68	11
Interest and dividends on investments (includes tax-exempt income of $1,755,000 as of March 31, 2019 and $1,719,000 as of March 31, 2018)	4,643	4,049
Total interest income	19,268	16,451
Interest expense
Interest on deposits	5,577	3,099
Interest on borrowed funds	792	943
Total interest expense	6,369	4,042
Net interest income	12,899	12,409
Provision for loan losses	375	500
Net interest income after provision for loan losses	12,524	11,909
Non-interest income
Net securities gains	0	136
Other operating income	1,514	1,398
Total non-interest income	3,144	3,132
Non-interest expense
Salaries and employee benefits	4,410	4,490
Occupancy expense	652	699
Furniture and equipment expense	975	929
FDIC insurance premiums	208	279
Amortization of identified intangibles	11	11
Other operating expense	2,142	2,171
Total non-interest expense	8,398	8,579
Income before income taxes	7,270	6,462
Income tax expense	1,114	956
NET INCOME	$ 6,156	$ 5,506
Basic earnings per common share (usd per share)	$ 0.57	$ 0.51
Diluted earnings per common share (usd per share)	$ 0.57	$ 0.51
Other comprehensive income (loss) net of tax
Net unrealized gain (loss) on securities available for sale	$ 3,512	$ (3,309)
Net unrealized gain (loss) on securities transferred from available for sale to held to maturity, net of amortization	3	(8)
Net unrealized gain (loss) on cash flow hedging derivative instruments	(465)	384
Other comprehensive income (loss)	3,050	(2,933)
Comprehensive income	9,206	2,573
Investment management and fiduciary income
Non-interest income
Non-interest income	773	740
Service charges on deposit accounts
Non-interest income
Non-interest income	561	527
Mortgage origination and servicing income, net of amortization
Non-interest income
Non-interest income	$ 296	$ 331

Consolidated Statements of In_2

Consolidated Statements of Income and Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Interest and fees on loans (tax-exempt income)	$ 358	$ 211
Interest and dividends on investments (tax-exempt income)	$ 1,755	$ 1,719

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, 2017		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	5,506		5,506
Net unrealized loss on securities available for sale, net of tax	(3,309)			(3,309)
Net unrealized loss on cash flow hedging derivative instruments, net of tax	384			384
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	(8)			(8)
Comprehensive income	2,573		5,506	(2,933)
Cash dividends declared	(2,607)		(2,607)
Equity compensation expense	95	$ 95
Payment to repurchase of common stock (in shares)		(5,725)
Payment to repurchase common stock	(167)		(167)
Issuance of restricted stock (in shares)		16,795
Proceeds from sale of common stock (in shares)		5,574
Proceeds from sale of common stock	$ 157	$ 157
Ending balance (in shares) at Mar. 31, 2018	10,846,562	10,846,562
Ending balance at Mar. 31, 2018	$ 181,372	$ 62,107	123,876	(4,611)
Beginning balance (in shares) at Dec. 31, 2018	10,862,651	10,862,651
Beginning balance at Dec. 31, 2018	$ 191,542	$ 62,855	132,460	(3,773)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,156		6,156
Net unrealized loss on securities available for sale, net of tax	3,512			3,512
Net unrealized loss on cash flow hedging derivative instruments, net of tax	(465)			(465)
Net unrealized gain on securities transferred from available for sale to held to maturity, net of tax	3			3
Comprehensive income	9,206		6,156	3,050
Cash dividends declared	(3,156)		(3,156)
Equity compensation expense	123	$ 123
Payment to repurchase of common stock (in shares)		(3,804)
Payment to repurchase common stock	(96)		(96)
Issuance of restricted stock (in shares)		19,087
Proceeds from sale of common stock (in shares)		6,447
Proceeds from sale of common stock	$ 168	$ 168
Ending balance (in shares) at Mar. 31, 2019	10,884,381	10,884,381
Ending balance at Mar. 31, 2019	$ 197,787	$ 63,146	$ 135,364	$ (723)

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (usd per share)	$ 0.29	$ 0.24

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities
Net income	$ 6,156	$ 5,506
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation	449	464
Change in deferred taxes	203	(163)
Provision for loan losses	375	500
Loans originated for resale	(4,661)	(4,835)
Proceeds from sales and transfers of loans	4,305	5,016
Net gain on sales of loans	(80)	(79)
Net gain on sale or call of securities	0	(136)
Net amortization of premiums on investments	261	552
Net gain on sale of other real estate owned	0	(13)
Equity compensation expense	123	95
Net increase in other assets and accrued interest	(6,055)	(1,214)
Net increase (decrease) in other liabilities	(435)	5,014
Net loss on disposal of premises and equipment	1	127
Amortization of investment in limited partnership	77	43
Net acquisition amortization	11	11
Net cash provided by operating activities	730	10,888
Cash flows from investing activities
Decrease in interest-bearing deposits in other banks	11,848	580
Proceeds from sales of securities available for sale	0	459
Proceeds from maturities, payments and calls of securities available for sale	11,622	14,579
Proceeds from maturities, payments and calls of securities to be held to maturity	2,804	2,751
Proceeds from sales of other real estate owned	0	133
Purchases of securities available for sale	(15,325)	(23,262)
Purchases of securities to be held to maturity	(28,328)	(4,862)
Redemption of restricted equity securities	2,604	0
Purchase of restricted equity securities	0	(1,589)
Net increase in loans	(26,473)	(24,364)
Capital expenditures	(161)	(132)
Net cash used by investing activities	(41,409)	(35,707)
Cash flows from financing activities
Net decrease in demand, savings, and money market accounts	(41,277)	(66,433)
Net increase in certificates of deposit	121,067	75,746
Net increase in short-term borrowings	0	15,491
Repayment on long-term borrowings	(39,898)	(20)
Payment to repurchase common stock	(96)	(167)
Proceeds from sale of common stock	168	157
Dividends paid	(3,149)	(2,603)
Net cash provided by financing activities	36,815	22,171
Net decrease in cash and cash equivalents	(3,864)	(2,648)
Cash and cash equivalents at beginning of period	19,134	19,207
Cash and cash equivalents at end of period	15,270	16,559
Interest paid	6,221	3,925
Income taxes paid (refunded)	0	(8)
Non-cash transactions
Net transfer from loans to other real estate owned	$ 0	$ 229

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2019
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 2019 period is not necessarily indicative of the results that may be expected for the year ending December 31, 2019 . 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, 2018 . Subsequent Events Events occurring subsequent to March 31, 2019

Investment Securities

Investment Securities	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 : Amortized Cost Unrealized Gains Unrealized Losses Fair Value (Estimated) Securities available for sale U.S. Government-sponsored agencies $ 5,000,000 $ 16,000 $ — $ 5,016,000 Mortgage-backed securities 317,269,000 1,394,000 (3,240,000 ) 315,423,000 State and political subdivisions 4,955,000 4,000 (122,000 ) 4,837,000 $ 327,224,000 $ 1,414,000 $ (3,362,000 ) $ 325,276,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 31,155,000 $ 48,000 $ (280,000 ) $ 30,923,000 Mortgage-backed securities 17,560,000 372,000 (146,000 ) 17,786,000 State and political subdivisions 225,204,000 3,162,000 (1,801,000 ) 226,565,000 Corporate securities 7,300,000 — (6,000 ) 7,294,000 $ 281,219,000 $ 3,582,000 $ (2,233,000 ) $ 282,568,000 Restricted equity securities Federal Home Loan Bank Stock $ 7,945,000 $ — $ — $ 7,945,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 8,982,000 $ — $ — $ 8,982,000 The following table summarizes the amortized cost and estimated fair value of investment securities at December 31, 2018 : Amortized Cost Unrealized Gains Unrealized Losses Fair Value (Estimated) Securities available for sale U.S. Government-sponsored agencies $ 5,000,000 $ 7,000 $ — $ 5,007,000 Mortgage-backed securities 313,854,000 571,000 (6,732,000 ) 307,693,000 State and political subdivisions 4,955,000 — (239,000 ) 4,716,000 $ 323,809,000 $ 578,000 $ (6,971,000 ) $ 317,416,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 11,155,000 $ — $ (472,000 ) $ 10,683,000 Mortgage-backed securities 18,250,000 336,000 (255,000 ) 18,331,000 State and political subdivisions 221,958,000 1,046,000 (5,418,000 ) 217,586,000 Corporate securities 4,300,000 — — 4,300,000 $ 255,663,000 $ 1,382,000 $ (6,145,000 ) $ 250,900,000 Restricted equity securities Federal Home Loan Bank Stock $ 10,549,000 $ — $ — $ 10,549,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 11,586,000 $ — $ — $ 11,586,000 The following table summarizes the amortized cost and estimated fair value of investment securities at March 31, 2018 : Amortized Cost Unrealized Gains Unrealized Losses Fair Value (Estimated) Securities available for sale Mortgage-backed securities $ 302,935,000 $ 191,000 $ (7,798,000 ) $ 295,328,000 State and political subdivisions 5,765,000 3,000 (257,000 ) 5,511,000 $ 308,700,000 $ 194,000 $ (8,055,000 ) $ 300,839,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 11,155,000 $ — $ (515,000 ) $ 10,640,000 Mortgage-backed securities 21,990,000 469,000 (289,000 ) 22,170,000 State and political subdivisions 221,245,000 1,497,000 (4,001,000 ) 218,741,000 Corporate securities 4,300,000 — — 4,300,000 $ 258,690,000 $ 1,966,000 $ (4,805,000 ) $ 255,851,000 Restricted equity securities Federal Home Loan Bank Stock $ 10,910,000 $ — $ — $ 10,910,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 11,947,000 $ — $ — $ 11,947,000 The following table summarizes the contractual maturities of investment securities at March 31, 2019 : 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 $ — $ — $ 1,429,000 $ 1,431,000 Due in 1 to 5 years 15,670,000 15,736,000 21,096,000 21,203,000 Due in 5 to 10 years 107,978,000 108,698,000 176,967,000 178,044,000 Due after 10 years 203,576,000 200,842,000 81,727,000 81,890,000 $ 327,224,000 $ 325,276,000 $ 281,219,000 $ 282,568,000 The following table summarizes the contractual maturities of investment securities at December 31, 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 $ — $ — $ 1,432,000 $ 1,433,000 Due in 1 to 5 years 13,501,000 13,518,000 20,717,000 20,778,000 Due in 5 to 10 years 83,954,000 83,326,000 157,544,000 155,313,000 Due after 10 years 226,354,000 220,572,000 75,970,000 73,376,000 $ 323,809,000 $ 317,416,000 $ 255,663,000 $ 250,900,000 The following table summarizes the contractual maturities of investment securities at March 31, 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 $ 61,000 $ 61,000 $ 634,000 $ 635,000 Due in 1 to 5 years 6,502,000 6,492,000 25,692,000 25,796,000 Due in 5 to 10 years 66,434,000 65,234,000 145,297,000 144,211,000 Due after 10 years 235,703,000 229,052,000 87,067,000 85,209,000 $ 308,700,000 $ 300,839,000 $ 258,690,000 $ 255,851,000 At March 31, 2019 , securities with a fair value of $189,711,000 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 $222,829,000 as of December 31, 2018 and $197,349,000 at March 31, 2018 , 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 three months ended March 31, 2019 and 2018 : For the three months ended March 31, 2019 2018 Proceeds from sales of securities $ — $ 459,000 Gross realized gains — 136,000 Gross realized losses — — Net gain $ — $ 136,000 Related income taxes $ — $ 29,000 Management reviews securities with unrealized losses for other than temporary impairment. As of March 31, 2019 , there were 291 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 274 had been temporarily impaired for 12 months or more. In the first quarter, one issuer of securities held in the portfolio was downgraded by a rating agency to less than investment grade. These securities total approximately 0.4% of overall state and municipal security holdings and are being monitored. The Company also has the ability and intent to hold its impaired securities until a recovery of their amortized cost, which may be at maturity. Information regarding securities temporarily impaired as of March 31, 2019 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 $ — $ — $ 10,875,000 $ (280,000 ) $ 10,875,000 $ (280,000 ) Mortgage-backed securities 24,525,000 (138,000 ) 198,272,000 (3,248,000 ) 222,797,000 (3,386,000 ) State and political subdivisions 1,264,000 (3,000 ) 58,168,000 (1,920,000 ) 59,432,000 (1,923,000 ) Corporate securities 2,994,000 (6,000 ) — — 2,994,000 (6,000 ) $ 28,783,000 $ (147,000 ) $ 267,315,000 $ (5,448,000 ) $ 296,098,000 $ (5,595,000 ) As of December 31, 2018 , there were 511 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 232 had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of December 31, 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 $ — $ — $ 10,683,000 $ (472,000 ) $ 10,683,000 $ (472,000 ) Mortgage-backed securities 76,050,000 (1,061,000 ) 185,136,000 (5,926,000 ) 261,186,000 (6,987,000 ) State and political subdivisions 76,809,000 (1,784,000 ) 45,052,000 (3,873,000 ) 121,861,000 (5,657,000 ) $ 152,859,000 $ (2,845,000 ) $ 240,871,000 $ (10,271,000 ) $ 393,730,000 $ (13,116,000 ) As of March 31, 2018 , there were 457 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 159 had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of March 31, 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 $ 6,946,000 $ (309,000 ) $ 3,694,000 $ (206,000 ) $ 10,640,000 $ (515,000 ) Mortgage-backed securities 183,335,000 (4,332,000 ) 101,012,000 (3,755,000 ) 284,347,000 (8,087,000 ) State and political subdivisions 64,594,000 (1,533,000 ) 37,182,000 (2,725,000 ) 101,776,000 (4,258,000 ) $ 254,875,000 $ (6,174,000 ) $ 141,888,000 $ (6,686,000 ) $ 396,763,000 $ (12,860,000 ) 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 $194,000 at March 31, 2019 . 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 March 31, 2019 and 2018 , and December 31, 2018 , the Bank's investment in FHLB stock totaled $7,945,000 , $10,910,000 and $10,549,000 , 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 March 31, 2019

Loans

Loans	3 Months Ended
	Mar. 31, 2019
Loans and Leases Receivable Disclosure [Abstract]
Loans	Loans The following table shows the composition of the Company's loan portfolio as of March 31, 2019 and 2018 and at December 31, 2018 : March 31, 2019 December 31, 2018 March 31, 2018 Commercial Real estate $ 357,760,000 28.3 % $ 353,243,000 28.5 % $ 339,306,000 28.6 % Construction 34,231,000 2.7 % 27,304,000 2.2 % 43,813,000 3.7 % Other 205,462,000 16.2 % 196,391,000 15.9 % 177,783,000 15.0 % Municipal 54,246,000 4.3 % 51,128,000 4.1 % 35,463,000 3.0 % Residential Term 474,241,000 37.5 % 469,145,000 37.9 % 439,984,000 37.0 % Construction 18,450,000 1.5 % 17,743,000 1.4 % 15,847,000 1.3 % Home equity line of credit 95,692,000 7.6 % 98,469,000 8.0 % 110,298,000 9.3 % Consumer 24,557,000 1.9 % 24,860,000 2.0 % 25,508,000 2.1 % Total $ 1,264,639,000 100.0 % $ 1,238,283,000 100.0 % $ 1,188,002,000 100.0 % Loan balances include net deferred loan costs of $6,878,000 as of March 31, 2019 , $6,615,000 as of December 31, 2018 , and $5,990,000 as of March 31, 2018 . Pursuant to collateral agreements, qualifying first mortgage loans and commercial real estate loans, which totaled $321,290,000 at March 31, 2019 , were used to collateralize borrowings from the FHLB. This compares to qualifying first mortgages loans which totaled $290,138,000 at December 31, 2018 , and $237,239,000 at March 31, 2018 . In addition, commercial, construction and home equity loans totaling $251,591,000 at March 31, 2019 , $237,152,000 at December 31, 2018 , and $255,020,000 at March 31, 2018 , 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 March 31, 2019 , 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 $ 282,000 $ 825,000 $ 621,000 $ 1,728,000 $ 356,032,000 $ 357,760,000 $ — Construction 47,000 — 286,000 333,000 33,898,000 34,231,000 — Other 664,000 63,000 303,000 1,030,000 204,432,000 205,462,000 — Municipal — — — — 54,246,000 54,246,000 — Residential Term 2,659,000 1,153,000 1,434,000 5,246,000 468,995,000 474,241,000 — Construction — — — — 18,450,000 18,450,000 — Home equity line of credit 1,985,000 11,000 369,000 2,365,000 93,327,000 95,692,000 — Consumer 411,000 163,000 4,000 578,000 23,979,000 24,557,000 4,000 Total $ 6,048,000 $ 2,215,000 $ 3,017,000 $ 11,280,000 $ 1,253,359,000 $ 1,264,639,000 $ 4,000 Information on the past-due status of loans by class of financing receivable as of December 31, 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 $ 1,274,000 $ — $ 777,000 $ 2,051,000 $ 351,192,000 $ 353,243,000 $ — Construction — 10,000 — 10,000 27,294,000 27,304,000 — Other 455,000 5,000 120,000 580,000 195,811,000 196,391,000 — Municipal — — — — 51,128,000 51,128,000 — Residential Term 1,097,000 3,518,000 2,023,000 6,638,000 462,507,000 469,145,000 339,000 Construction 76,000 — — 76,000 17,667,000 17,743,000 — Home equity line of credit 2,819,000 419,000 493,000 3,731,000 94,738,000 98,469,000 — Consumer 237,000 25,000 27,000 289,000 24,571,000 24,860,000 12,000 Total $ 5,958,000 $ 3,977,000 $ 3,440,000 $ 13,375,000 $ 1,224,908,000 $ 1,238,283,000 $ 351,000 Information on the past-due status of loans by class of financing receivable as of March 31, 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 $ 963,000 $ 17,000 $ 202,000 $ 1,182,000 $ 338,124,000 $ 339,306,000 $ — Construction 347,000 — — 347,000 43,466,000 43,813,000 — Other 6,887,000 52,000 294,000 7,233,000 170,550,000 177,783,000 — Municipal — — — — 35,463,000 35,463,000 — Residential Term 3,175,000 345,000 1,880,000 5,400,000 434,584,000 439,984,000 — Construction — — — — 15,847,000 15,847,000 — Home equity line of credit 449,000 438,000 664,000 1,551,000 108,747,000 110,298,000 126,000 Consumer 119,000 8,000 27,000 154,000 25,354,000 25,508,000 11,000 Total $ 11,940,000 $ 860,000 $ 3,067,000 $ 15,867,000 $ 1,172,135,000 $ 1,188,002,000 $ 137,000 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 March 31, 2019 and 2018 and at December 31, 2018 is presented in the following table: March 31, 2019 December 31, 2018 March 31, 2018 Commercial Real estate $ 1,468,000 $ 1,226,000 $ 1,021,000 Construction 286,000 — — Other 7,067,000 8,664,000 8,895,000 Municipal — — — Residential Term 4,211,000 4,062,000 3,654,000 Construction — — — Home equity line of credit 702,000 760,000 697,000 Consumer 2,000 15,000 16,000 Total $ 13,736,000 $ 14,727,000 $ 14,283,000 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 March 31, 2019 is presented in the following table: For the three months ended March 31, 2019 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 8,391,000 $ 8,779,000 $ — $ 8,741,000 $ 90,000 Construction 1,007,000 1,007,000 — 817,000 12,000 Other 709,000 734,000 — 1,207,000 6,000 Municipal — — — — — Residential Term 8,926,000 10,345,000 — 9,007,000 68,000 Construction — — — — — Home equity line of credit 1,009,000 1,071,000 — 976,000 5,000 Consumer — — — — — $ 20,042,000 $ 21,936,000 $ — $ 20,748,000 $ 181,000 With an Allowance Recorded Commercial Real estate $ 1,566,000 $ 1,583,000 $ 233,000 $ 1,215,000 $ 26,000 Construction — — — — — Other 6,944,000 7,315,000 1,485,000 7,511,000 — Municipal — — — — — Residential Term 1,993,000 2,131,000 348,000 1,845,000 17,000 Construction — — — — — Home equity line of credit 21,000 25,000 7,000 29,000 — Consumer 2,000 2,000 2,000 1,000 — $ 10,526,000 $ 11,056,000 $ 2,075,000 $ 10,601,000 $ 43,000 Total Commercial Real estate $ 9,957,000 $ 10,362,000 $ 233,000 $ 9,956,000 $ 116,000 Construction 1,007,000 1,007,000 — 817,000 12,000 Other 7,653,000 8,049,000 1,485,000 8,718,000 6,000 Municipal — — — — — Residential Term 10,919,000 12,476,000 348,000 10,852,000 85,000 Construction — — — — — Home equity line of credit 1,030,000 1,096,000 7,000 1,005,000 5,000 Consumer 2,000 2,000 2,000 1,000 — $ 30,568,000 $ 32,992,000 $ 2,075,000 $ 31,349,000 $ 224,000 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, 2018 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 $ 8,718,000 $ 9,161,000 $ — $ 5,536,000 $ 380,000 Construction 721,000 721,000 — 762,000 43,000 Other 1,468,000 1,555,000 — 2,037,000 32,000 Municipal — — — — — Residential Term 9,136,000 10,317,000 — 9,427,000 289,000 Construction — — — — — Home equity line of credit 972,000 1,035,000 — 1,001,000 20,000 Consumer 15,000 42,000 — 13,000 — $ 21,030,000 $ 22,831,000 $ — $ 18,776,000 $ 764,000 With an Allowance Recorded Commercial Real estate $ 1,042,000 $ 1,059,000 $ 260,000 $ 3,477,000 $ 42,000 Construction — — — — — Other 7,791,000 8,216,000 1,696,000 7,471,000 5,000 Municipal — — — — — Residential Term 1,768,000 1,998,000 335,000 1,982,000 53,000 Construction — — — — — Home equity line of credit 120,000 124,000 17,000 99,000 — Consumer — — — — — $ 10,721,000 $ 11,397,000 $ 2,308,000 $ 13,029,000 $ 100,000 Total Commercial Real estate $ 9,760,000 $ 10,220,000 $ 260,000 $ 9,013,000 $ 422,000 Construction 721,000 721,000 — 762,000 43,000 Other 9,259,000 9,771,000 1,696,000 9,508,000 37,000 Municipal — — — — — Residential Term 10,904,000 12,315,000 335,000 11,409,000 342,000 Construction — — — — — Home equity line of credit 1,092,000 1,159,000 17,000 1,100,000 20,000 Consumer 15,000 42,000 — 13,000 — $ 31,751,000 $ 34,228,000 $ 2,308,000 $ 31,805,000 $ 864,000 A breakdown of impaired loans by class of financing receivable as of and for the period ended March 31, 2018 is presented in the following table: For the three months ended March 31, 2018 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 5,054,000 $ 5,269,000 $ — $ 4,163,000 $ 54,000 Construction 741,000 741,000 — 741,000 10,000 Other 2,281,000 2,360,000 — 2,302,000 6,000 Municipal — — — — — Residential Term 9,594,000 10,733,000 — 9,700,000 71,000 Construction — — — — — Home equity line of credit 917,000 1,008,000 — 1,090,000 5,000 Consumer 16,000 29,000 — 16,000 — $ 18,603,000 $ 20,140,000 $ — $ 18,012,000 $ 146,000 With an Allowance Recorded Commercial Real estate $ 3,897,000 $ 4,002,000 $ 254,000 $ 3,889,000 $ 39,000 Construction — — — — — Other 7,159,000 7,324,000 1,664,000 7,182,000 — Municipal — — — — — Residential Term 1,934,000 2,146,000 272,000 1,968,000 24,000 Construction — — — — — Home equity line of credit 122,000 125,000 16,000 70,000 — Consumer — — — — — $ 13,112,000 $ 13,597,000 $ 2,206,000 $ 13,109,000 $ 63,000 Total Commercial Real estate $ 8,951,000 $ 9,271,000 $ 254,000 $ 8,052,000 $ 93,000 Construction 741,000 741,000 — 741,000 10,000 Other 9,440,000 9,684,000 1,664,000 9,484,000 6,000 Municipal — — — — — Residential Term 11,528,000 12,879,000 272,000 11,668,000 95,000 Construction — — — — — Home equity line of credit 1,039,000 1,133,000 16,000 1,160,000 5,000 Consumer 16,000 29,000 — 16,000 — $ 31,715,000 $ 33,737,000 $ 2,206,000 $ 31,121,000 $ 209,000 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 March 31, 2019 , the Company had 80 loans with a balance of $25,386,000 that have been classified as TDRs. This compares to 76 loans with a balance of $25,222,000 and 69 loans with a balance of $18,709,000 classified as TDRs as of December 31, 2018 and March 31, 2018 , 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 March 31, 2019 : Number of Loans Balance Specific Reserves Commercial Real estate 17 $ 8,583,000 $ 107,000 Construction 1 721,000 — Other 10 7,257,000 1,275,000 Municipal — — — Residential Term 49 8,331,000 225,000 Construction — — — Home equity line of credit 3 494,000 — Consumer — — — 80 $ 25,386,000 $ 1,607,000 The following table shows TDRs by class and the specific reserve as of December 31, 2018 : Number of Loans Balance Specific Reserves Commercial Real estate 17 $ 8,631,000 $ 132,000 Construction 1 721,000 — Other 10 7,298,000 1,276,000 Municipal — — — Residential Term 45 8,074,000 160,000 Construction — — — Home equity line of credit 3 498,000 — Consumer — — — 76 $ 25,222,000 $ 1,568,000 The following table shows TDRs by class and the specific reserve as of March 31, 2018 : Number of Loans Balance Specific Reserves Commercial Real estate 15 $ 8,030,000 $ 132,000 Construction 1 741,000 — Other 4 546,000 — Municipal — — — Residential Term 46 8,883,000 271,000 Construction — — — Home equity line of credit 3 509,000 — Consumer — — — 69 $ 18,709,000 $ 403,000 As of March 31, 2019 , 10 of the loans classified as TDRs with a total balance of $1,129,000 were more than 30 days past due. Of these loans, three 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 March 31, 2019 : Number of Loans Balance Specific Reserves Commercial Real estate — $ — $ — Construction — — — Other 4 261,000 134,000 Municipal — — — Residential Term 5 701,000 36,000 Construction — — — Home equity line of credit 1 167,000 — Consumer — — — 10 $ 1,129,000 $ 170,000 As of March 31, 2018 , seven of the loans classified as TDRs with a total balance of $810,000 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 March 31, 2018 : Number of Loans Balance Specific Reserves Commercial Real estate — $ — $ — Construction — — — Other — — — Municipal — — — Residential Term 6 643,000 45,000 Construction — — — Home equity line of credit 1 167,000 — Consumer — — — 7 $ 810,000 $ 45,000 For the three months ended March 31, 2019 , five 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 March 31, 2019 : Number of Loans Pre-Modification Post-Modification Outstanding Specific Reserves Commercial Real estate — $ — $ — $ — Construction — — — — Other — — — — Municipal — — — — Residential Term 5 573,000 554,000 74,000 Construction — — — — Home equity line of credit — — — — Consumer — — — — 5 $ 573,000 $ 554,000 $ 74,000 For the three months ended March 31, 2018 , seven loans were placed on TDR status. The following table shows these TDRs by class and associated specific reserves included in the allowance for loan losses as of March 31, 2018 . Number of Loans Pre-Modification Post-Modification Outstanding Specific Reserves Commercial Real estate 7 $ 1,056,000 $ 1,056,000 $ 36,000 Construction — — — — Other — — — — Municipal — — — — Residential Term — — — — Construction — — — — Home equity line of credit — — — — Consumer — — — — 7 $ 1,056,000 $ 1,056,000 $ 36,000 As of March 31, 2019 , Management is aware of seven loans classified as TDRs that are involved in bankruptcy with an outstanding balance of $929,000 . There were also 20 loans with an outstanding balance of $8,555,000 that were classified as TDRs and on non-accrual status, of which three loans with an outstanding balance of $398,000 were in the process of foreclosure. Residential Mortgage Loans in Process of Foreclosure As of March 31, 2019 , there were 10 mortgage loans collateralized by residential real estate in the process of foreclosure with a total balance of $ 1,101,000 . This compares to 13 mortgage loans collateralized by residential real estate in the process of foreclosure with a total balance of $1,388,000 as of March 31, 2018

Allowance for Loan Losses

Allowance for Loan Losses	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 , December 31, 2018 , and March 31, 2018 , by class of financing receivable and allowance element, is presented in the following tables: As of March 31, 2019 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 $ 233,000 $ 790,000 $ 2,609,000 $ — $ 3,632,000 Construction — 76,000 249,000 — 325,000 Other 1,485,000 452,000 1,493,000 — 3,430,000 Municipal — — 25,000 — 25,000 Residential Term 348,000 182,000 584,000 — 1,114,000 Construction — 7,000 23,000 — 30,000 Home equity line of credit 7,000 158,000 465,000 — 630,000 Consumer 2,000 290,000 368,000 — 660,000 Unallocated — — — 1,644,000 1,644,000 $ 2,075,000 $ 1,955,000 $ 5,816,000 $ 1,644,000 $ 11,490,000 As of December 31, 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 $ 260,000 $ 742,000 $ 2,565,000 $ — $ 3,567,000 Construction — 57,000 198,000 — 255,000 Other 1,696,000 414,000 1,431,000 — 3,541,000 Municipal — — 24,000 — 24,000 Residential Term 335,000 326,000 574,000 — 1,235,000 Construction — 12,000 22,000 — 34,000 Home equity line of credit 17,000 263,000 450,000 — 730,000 Consumer — 271,000 359,000 — 630,000 Unallocated — — — 1,216,000 1,216,000 $ 2,308,000 $ 2,085,000 $ 5,623,000 $ 1,216,000 $ 11,232,000 As of March 31, 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 $ 254,000 $ 1,039,000 $ 2,439,000 $ — $ 3,732,000 Construction — 81,000 315,000 — 396,000 Other 1,664,000 597,000 1,279,000 — 3,540,000 Municipal — — 21,000 — 21,000 Residential Term 272,000 303,000 554,000 — 1,129,000 Construction — 11,000 20,000 — 31,000 Home equity line of credit 16,000 297,000 403,000 — 716,000 Consumer — 265,000 316,000 — 581,000 Unallocated — — — 811,000 811,000 $ 2,206,000 $ 2,593,000 $ 5,347,000 $ 811,000 $ 10,957,000 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. Qualitative factors applied to the portfolio or segments of the portfolio may include judgments concerning general economic conditions that may affect credit quality, credit concentrations, the pace of portfolio growth, the direction of risk rating movements, policy exception levels, and delinquency levels; these qualitative factors are also considered in connection with the unallocated portion of our allowance for loan losses. The qualitative portion of the allowance for loan losses was 0.46% of related loans as of March 31, 2019 , compared to 0.45% of related loans as of December 31, 2018 . The qualitative portion increased $193,000 between December 31, 2018 and March 31, 2019 due to a mix of factors. The unallocated component of the allowance totaled $1,644,000 at March 31, 2019 , or 14.3% of the total reserve. This compares to $1,216,000 or 10.8% as of December 31, 2018 . The change supported general imprecision related to portfolio growth and includes consideration of general economic and business conditions affecting our lending area, credit quality trends (including trends in delinquencies and nonperforming loans expected to result from existing conditions), loan volumes and concentrations, duration of the current business cycle, bank regulatory examination results, findings of external loan review examiners, and Management's judgment with respect to various other conditions including loan administration and management and the quality of risk identification systems. Consequently, there maybe underlying credit risks that have not yet surfaced in the loan specific or qualitative metrics the Company uses to estimate its allowance for loan losses that are reflected in the unallocated component. The allowance for loan losses as a percent of total loans stood at 0.91% as of March 31, 2019 and December 31, 2018 and 0.92% as of March 31, 2018 . 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 estate 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 29.4% of capital are below the regulatory guidance limit of 100.0% of capital at March 31, 2019 . Construction loans and non-owner-occupied commercial real estate loans are at 128.4% of total capital, below the regulatory limit of 300.0% of capital at March 31, 2019 . 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 March 31, 2019 : Commercial Real Estate Commercial Construction Commercial Other Municipal Loans All Risk- Rated Loans 1 Strong $ — $ — $ 3,630,000 $ 43,000 $ 3,673,000 2 Above Average 10,097,000 36,000 4,447,000 51,806,000 66,386,000 3 Satisfactory 82,595,000 2,352,000 43,963,000 450,000 129,360,000 4 Average 179,290,000 23,267,000 89,825,000 1,947,000 294,329,000 5 Watch 63,503,000 8,290,000 50,619,000 — 122,412,000 6 OAEM 2,847,000 — 1,993,000 — 4,840,000 7 Substandard 19,305,000 286,000 10,985,000 — 30,576,000 8 Doubtful 123,000 — — — 123,000 Total $ 357,760,000 $ 34,231,000 $ 205,462,000 $ 54,246,000 $ 651,699,000 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, 2018 : Commercial Real Estate Commercial Construction Commercial Other Municipal Loans All Risk- Rated Loans 1 Strong $ — $ — $ 3,444,000 $ — $ 3,444,000 2 Above Average 10,484,000 37,000 4,564,000 48,800,000 63,885,000 3 Satisfactory 80,266,000 2,231,000 46,090,000 518,000 129,105,000 4 Average 172,597,000 18,780,000 82,081,000 1,810,000 275,268,000 5 Watch 66,325,000 5,970,000 45,546,000 — 117,841,000 6 OAEM 6,890,000 — 1,805,000 — 8,695,000 7 Substandard 16,558,000 286,000 12,861,000 — 29,705,000 8 Doubtful 123,000 — — — 123,000 Total $ 353,243,000 $ 27,304,000 $ 196,391,000 $ 51,128,000 $ 628,066,000 The following table summarizes the risk ratings for the Company's commercial real estate, commercial construction, commercial other, and municipal loans as of March 31, 2018 : Commercial Real Estate Commercial Construction Commercial Other Municipal Loans All Risk- Rated Loans 1 Strong $ — $ — $ 1,251,000 $ — $ 1,251,000 2 Above Average 12,308,000 40,000 5,528,000 33,875,000 51,751,000 3 Satisfactory 74,612,000 4,776,000 38,738,000 653,000 118,779,000 4 Average 183,675,000 21,585,000 79,751,000 935,000 285,946,000 5 Watch 46,918,000 17,412,000 35,743,000 — 100,073,000 6 OAEM 3,148,000 — 1,866,000 — 5,014,000 7 Substandard 18,522,000 — 14,906,000 — 33,428,000 8 Doubtful 123,000 — — — 123,000 Total $ 339,306,000 $ 43,813,000 $ 177,783,000 $ 35,463,000 $ 596,365,000 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 three months ended March 31, 2019 . The following table presents allowance for loan losses activity by class for the three months and quarter ended March 31, 2019 , and allowance for loan loss balances by class and related loan balances by class as of March 31, 2019 : Commercial Municipal Residential Home Equity Line of Credit Consumer Unallocated Total Real Estate Construction Other Term Construction For the three months ended March 31, 2019 Beginning balance $ 3,567,000 $ 255,000 $ 3,541,000 $ 24,000 $ 1,235,000 $ 34,000 $ 730,000 $ 630,000 $ 1,216,000 $ 11,232,000 Charge offs — — 1,000 — 49,000 — 38,000 63,000 — 151,000 Recoveries 8,000 — 1,000 — 3,000 — 1,000 21,000 — 34,000 Provision (credit) 57,000 70,000 (111,000 ) 1,000 (75,000 ) (4,000 ) (63,000 ) 72,000 428,000 375,000 Ending balance $ 3,632,000 $ 325,000 $ 3,430,000 $ 25,000 $ 1,114,000 $ 30,000 $ 630,000 $ 660,000 $ 1,644,000 $ 11,490,000 Allowance for loan losses as of March 31, 2019 Ending balance specifically evaluated for impairment $ 233,000 $ — $ 1,485,000 $ — $ 348,000 $ — $ 7,000 $ 2,000 $ — $ 2,075,000 Ending balance collectively evaluated for impairment $ 3,399,000 $ 325,000 $ 1,945,000 $ 25,000 $ 766,000 $ 30,000 $ 623,000 $ 658,000 $ 1,644,000 $ 9,415,000 Related loan balances as of March 31, 2019 Ending balance $ 357,760,000 $ 34,231,000 $ 205,462,000 $ 54,246,000 $ 474,241,000 $ 18,450,000 $ 95,692,000 $ 24,557,000 $ — $ 1,264,639,000 Ending balance specifically evaluated for impairment $ 9,957,000 $ 1,007,000 $ 7,653,000 $ — $ 10,919,000 $ — $ 1,030,000 $ 2,000 $ — $ 30,568,000 Ending balance collectively evaluated for impairment $ 347,803,000 $ 33,224,000 $ 197,809,000 $ 54,246,000 $ 463,322,000 $ 18,450,000 $ 94,662,000 $ 24,555,000 $ — $ 1,234,071,000 The following table presents allowance for loan losses activity by class for the year ended December 31, 2018 and allowance for loan loss balances by class and related loan balances by class as of December 31, 2018 : Commercial Municipal Residential Home Equity Line of Credit Consumer Unallocated Total Real Estate Construction Other Term Construction For the year ended December 31, 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 168,000 — 423,000 — 213,000 — 121,000 348,000 — 1,273,000 Recoveries 52,000 — 40,000 — 64,000 — 24,000 96,000 — 276,000 Provision (credit) (189,000 ) (179,000 ) 566,000 4,000 254,000 (2,000 ) 135,000 337,000 574,000 1,500,000 Ending balance $ 3,567,000 $ 255,000 $ 3,541,000 $ 24,000 $ 1,235,000 $ 34,000 $ 730,000 $ 630,000 $ 1,216,000 $ 11,232,000 Allowance for loan losses as of December 31, 2018 Ending balance specifically evaluated for impairment $ 260,000 $ — $ 1,696,000 $ — $ 335,000 $ — $ 17,000 $ — $ — $ 2,308,000 Ending balance collectively evaluated for impairment $ 3,307,000 $ 255,000 $ 1,845,000 $ 24,000 $ 900,000 $ 34,000 $ 713,000 $ 630,000 $ 1,216,000 $ 8,924,000 Related loan balances as of December 31, 2018 Ending balance $ 353,243,000 $ 27,304,000 $ 196,391,000 $ 51,128,000 $ 469,145,000 $ 17,743,000 $ 98,469,000 $ 24,860,000 $ — $ 1,238,283,000 Ending balance specifically evaluated for impairment $ 9,760,000 $ 721,000 $ 9,259,000 $ — $ 10,904,000 $ — $ 1,092,000 $ 15,000 $ — $ 31,751,000 Ending balance collectively evaluated for impairment $ 343,483,000 $ 26,583,000 $ 187,132,000 $ 51,128,000 $ 458,241,000 $ 17,743,000 $ 97,377,000 $ 24,845,000 $ — $ 1,206,532,000 The following table presents allowance for loan losses activity by class for the three months and quarter ended March 31, 2018 , and allowance for loan loss balances by class and related loan balances by class as of March 31, 2018 : Commercial Municipal Residential Home Equity Line of Credit Consumer Unallocated Total Real Estate Construction Other Term Construction For the three months ended March 31, 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 — 81,000 — 115,000 105,000 — 318,000 Recoveries — — 6,000 — 4,000 — 11,000 25,000 — 46,000 Provision (credit) (140,000 ) (38,000 ) 193,000 1,000 76,000 (5,000 ) 128,000 116,000 169,000 500,000 Ending 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 Allowance for loan losses as of March 31, 2018 Ending balance specifically evaluated for impairment $ 254,000 $ — $ 1,664,000 $ — $ 272,000 $ — $ 16,000 $ — $ — $ 2,206,000 Ending balance collectively evaluated for impairment $ 3,478,000 $ 396,000 $ 1,876,000 $ 21,000 $ 857,000 $ 31,000 $ 700,000 $ 581,000 $ 811,000 $ 8,751,000 Related loan balances as of March 31, 2018 Ending balance $ 339,306,000 $ 43,813,000 $ 177,783,000 $ 35,463,000 $ 439,984,000 $ 15,847,000 $ 110,298,000 $ 25,508,000 $ — $ 1,188,002,000 Ending balance specifically evaluated for impairment $ 8,951,000 $ 741,000 $ 9,440,000 $ — $ 11,528,000 $ — $ 1,039,000 $ 16,000 $ — $ 31,715,000 Ending balance collectively evaluated for impairment $ 330,355,000 $ 43,072,000 $ 168,343,000 $ 35,463,000 $ 428,456,000 $ 15,847,000 $ 109,259,000 $ 25,492,000 $ — $ 1,156,287,000

Stock-Based Compensation

Stock-Based Compensation	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 , 163,192 shares of restricted stock had been granted under the 2010 Plan, of which 75,804 shares remain restricted as of March 31, 2019 as detailed in the following table: Year Granted Vesting Term (In Years) Shares Remaining Term (In Years) 2015 5.0 12,023 0.9 2016 5.0 15,015 1.8 2017 3.0 4,902 0.9 2017 5.0 9,972 2.8 2018 2.0 932 0.8 2018 3.0 2,150 1.9 2018 4.0 2,068 2.8 2018 5.0 9,655 3.8 2019 1.0 1,349 0.8 2019 2.0 1,484 1.8 2019 3.0 16,254 2.8 75,804 2.1 The compensation cost related to these restricted stock grants is $1,797,000 and is recognized over the vesting terms of each grant. In the three months ended March 31, 2019 , $123,000 of expense was recognized for these restricted shares, leaving $1,046,000 in unrecognized expense as of March 31, 2019 . In the three months ended March 31, 2018 , $95,000 of expense was recognized for restricted shares, leaving $964,000 in unrecognized expense as of March 31, 2018

Preferred and Common Stock

Preferred and Common Stock	3 Months Ended
	Mar. 31, 2019
Stockholders' Equity Note [Abstract]
Preferred and Common Stock	Preferred and Common Stock Preferred Stock The Company does not have any preferred stock. Common Stock Proceeds from sale of common stock totaled $168,000 and $157,000 for the three months ended March 31, 2019 and 2018

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2019
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 three months ended March 31, 2019 and 2018 : Income (Numerator) Shares (Denominator) Per-Share Amount For the three months ended March 31, 2019 Net income as reported $ 6,156,000 Basic EPS: Income available to common shareholders 6,156,000 10,802,782 $ 0.57 Effect of dilutive securities: restricted stock 73,953 Diluted EPS: Income available to common shareholders plus assumed conversions $ 6,156,000 10,876,735 $ 0.57 For the three months ended March 31, 2018 Net income as reported $ 5,506,000 Basic EPS: Income available to common shareholders 5,506,000 10,771,271 $ 0.51 Effect of dilutive securities: restricted stock 73,228 Diluted EPS: Income available to common shareholders plus assumed conversions $ 5,506,000 10,844,499 $ 0.51

Employee Benefit Plans

Employee Benefit Plans	3 Months Ended
	Mar. 31, 2019
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 2018 . The amount for 2019 has not been established. The expense related to the 401(k) plan was $185,000 and $164,000 for the three months ended March 31, 2019 and 2018 , 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 $40,000 for the three months ended March 31, 2019 and $43,000 for the the same period in 2018 . As of March 31, 2019 , the associated accrued liability included in other liabilities in the balance sheet was $2,894,000 compared to $2,949,000 and $3,031,000 at December 31, 2018 and March 31, 2018 , 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 three months ended March 31, 2019 2018 Change in benefit obligation Benefit obligation at beginning of year $ 1,599,000 $ 1,874,000 Interest cost 17,000 19,000 Benefits paid (28,000 ) (28,000 ) Benefit obligation at end of period $ 1,588,000 $ 1,865,000 Funded status Benefit obligation at end of period $ (1,588,000 ) $ (1,865,000 ) Unamortized (gain) loss (47,000 ) 186,000 Accrued benefit cost at end of period $ (1,635,000 ) $ (1,679,000 ) The following table sets forth the net periodic pension cost: For the three months ended March 31, 2019 2018 Components of net periodic benefit cost Interest cost $ 17,000 $ 19,000 Net periodic benefit cost $ 17,000 $ 19,000 Amounts not yet reflected in net periodic benefit cost and included in accumulated other comprehensive income (loss) are as follows: March 31, December 31, 2018 March 31, Unamortized net actuarial gain (loss) $ 47,000 $ 47,000 $ (186,000 ) Deferred tax (benefit) expense (10,000 ) (10,000 ) 39,000 Net unrecognized postretirement benefits included in accumulated other comprehensive income (loss) $ 37,000 $ 37,000 $ (147,000 ) 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 2019 are $113,000 . Plan expense for 2019 is estimated to be $66,000 . 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

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2019
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 three months March 31, 2019 and 2018 . For the three months ended March 31, 2019 2018 Balance at beginning of period $ (5,051,000 ) $ (2,901,000 ) Unrealized gains (losses) arising during the period 4,446,000 (4,052,000 ) Reclassification of realized gains during the period — (136,000 ) Related deferred taxes (934,000 ) 879,000 Net change 3,512,000 (3,309,000 ) Balance at end of period $ (1,539,000 ) $ (6,210,000 ) 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 three months March 31, 2019 and 2018 . For the three months ended March 31, 2019 2018 Balance at beginning of period $ (197,000 ) $ (174,000 ) Amortization of net unrealized gains (losses) 4,000 (10,000 ) Related deferred taxes (1,000 ) 2,000 Net change 3,000 (8,000 ) Balance at end of period $ (194,000 ) $ (182,000 ) The following table presents the effect of the Company's derivative financial instruments included in other comprehensive income (loss) for the three months March 31, 2019 and 2018 . For the three months ended March 31, 2019 2018 Balance at beginning of period $ 1,438,000 $ 1,544,000 Unrealized gains (losses) on cash flow hedging derivatives arising during the period (589,000 ) 486,000 Related deferred taxes 124,000 (102,000 ) Net change (465,000 ) 384,000 Balance at end of period $ 973,000 $ 1,928,000 The following table summarizes activity in the unrealized gain or loss on postretirement benefits included in other comprehensive income (loss) for the three months March 31, 2019 and 2018 . For the three months ended March 31, 2019 2018 Unrecognized postretirement benefits at beginning of period $ 37,000 $ (147,000 ) Amortization of unrecognized transition obligation — — Change in unamortized net actuarial gain (loss) — — Related deferred taxes — — Unrecognized postretirement benefits at end of period $ 37,000 $ (147,000 )

Financial Derivative Instrument

Financial Derivative Instruments	3 Months Ended
	Mar. 31, 2019
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 Company is aware that LIBOR may no longer be published after December 31, 2021 and is monitoring the introduction and market acceptance of replacement indices. Each of the interest rate swap contracts the Company has in place are set to mature prior to December 31, 2021. The details of the interest rate swap agreements are as follows: March 31, 2019 December 31, 2018 March 31, 2018 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 % $ 847,000 $ 1,110,000 $ 1,447,000 20,000,000 June 27, 2016 June 27, 2021 1-Month USD LIBOR 0.893 % 586,000 763,000 994,000 25,000,000 June 5, 2018 December 5, 2019 1-Month USD LIBOR 2.466 % (7,000 ) 16,000 — 25,000,000 June 5, 2018 June 5, 2020 1-Month USD LIBOR 2.547 % (57,000 ) (9,000 ) — 25,000,000 June 5, 2018 December 5, 2020 1-Month USD LIBOR 2.603 % (137,000 ) (60,000 ) — $ 125,000,000 $ 1,232,000 $ 1,820,000 $ 2,441,000 (1) Presented within other assets in the consolidated balance sheet.

Mortgage Servicing Rights

Mortgage Servicing Rights	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 , the prepayment assumption using the PSA model was 153 , which translates into an anticipated prepayment rate of 9.18% . 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 three months ended March 31, 2019 and 2018 , servicing rights capitalized totaled $58,000 and $62,000 , respectively. Servicing rights amortized for the three-month periods ended March 31, 2019 and 2018 were $56,000 and $50,000 , respectively. The fair value of servicing rights was $2,410,000 , $2,586,000 and $2,518,000 at March 31, 2019 , December 31, 2018 and March 31, 2018 , respectively. The Bank serviced loans for others totaling $260,553,000 , $261,654,000 and $258,475,000 at March 31, 2019 , December 31, 2018 , and March 31, 2018 , respectively. Mortgage servicing rights are included in other assets and detailed in the following table: March 31, December 31, March 31, Mortgage servicing rights $ 5,776,000 $ 5,718,000 $ 5,489,000 Accumulated amortization (4,420,000 ) (4,364,000 ) (4,209,000 ) Impairment reserve — — — $ 1,356,000 $ 1,354,000 $ 1,280,000

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income TaxesFASB 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, 2016 through 2018.

Certificates of Deposit

Certificates of Deposit	3 Months Ended
	Mar. 31, 2019
Banking and Thrift [Abstract]
Certificates of Deposit	Certificates of Deposit The following table represents the breakdown of certificates of deposit at March 31, 2019 and 2018 , and at December 31, 2018 : March 31, 2019 December 31, 2018 March 31, 2018 Certificates of deposit < $100,000 $ 398,689,000 $ 372,464,000 $ 347,010,000 Certificates $100,000 to $250,000 238,429,000 162,185,000 240,492,000 Certificates $250,000 and over 75,358,000 56,760,000 47,245,000 $ 712,476,000 $ 591,409,000 $ 634,747,000

Reclassifications

Reclassifications	3 Months Ended
	Mar. 31, 2019
Accounting Changes and Error Corrections [Abstract]
Reclassifications	ReclassificationsCertain 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	3 Months Ended
	Mar. 31, 2019
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. 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 Fair values are estimated for portfolios of loans are based on exit pricing notion. 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. Time Deposits The fair value of maturity deposits is based on the discounted value of contractual cash flows using a replacement cost of funds approach. The discount rate is estimated using the cost of funds borrowing rate in the market. As such, the Company classifies deposits as Level 2. 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 March 31, 2019 and 2018 , and December 31, 2018 , 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. 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 March 31, 2019 , December 31, 2018 and March 31, 2018 . At March 31, 2019 Level 1 Level 2 Level 3 Total Securities available for sale U.S. Government-sponsored agencies $ — $ 5,016,000 $ — $ 5,016,000 Mortgage-backed securities — 315,423,000 — 315,423,000 State and political subdivisions — 4,837,000 — 4,837,000 Total securities available for sale — 325,276,000 — 325,276,000 Interest rate swap agreements — 1,232,000 — 1,232,000 Total assets $ — $ 326,508,000 $ — $ 326,508,000 At December 31, 2018 Level 1 Level 2 Level 3 Total Securities available for sale U.S. Government-sponsored agencies $ — $ 5,007,000 $ — $ 5,007,000 Mortgage-backed securities — 307,693,000 — 307,693,000 State and political subdivisions — 4,716,000 — 4,716,000 Total securities available for sale — 317,416,000 — 317,416,000 Interest rate swap agreements — 1,820,000 — 1,820,000 Total assets $ — $ 319,236,000 $ — $ 319,236,000 At March 31, 2018 Level 1 Level 2 Level 3 Total Securities available for sale Mortgage-backed securities $ — $ 295,328,000 $ — $ 295,328,000 State and political subdivisions — 5,511,000 — 5,511,000 Total securities available for sale — 300,839,000 — 300,839,000 Interest rate swap agreements — 2,441,000 — 2,441,000 Total assets $ — $ 303,280,000 $ — $ 303,280,000 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 $0 at March 31, 2019, 2018 and December 31, 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 $1,822,000 , $2,096,000 and $1,924,000 at March 31, 2019 , December 31, 2018 , and March 31, 2018 , respectively. At March 31, 2019 Level 1 Level 2 Level 3 Total Other real estate owned $ — $ 584,000 $ — $ 584,000 Impaired loans — 6,519,000 — 6,519,000 Total assets $ — $ 7,103,000 $ — $ 7,103,000 At December 31, 2018 Level 1 Level 2 Level 3 Total Other real estate owned $ — $ 584,000 $ — $ 584,000 Impaired loans — 7,415,000 — 7,415,000 Total assets $ — $ 7,999,000 $ — $ 7,999,000 At March 31, 2018 Level 1 Level 2 Level 3 Total Other real estate owned $ — $ 1,121,000 $ — $ 1,121,000 Impaired loans — 5,938,000 — 5,938,000 Total assets $ — $ 7,059,000 $ — $ 7,059,000 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. This summary excludes financial assets and liabilities for which carrying value approximates fair values and financial instruments that are recorded at fair value on a recurring basis. Financial instruments for which carrying values approximate fair value include cash equivalents, interest-bearing deposits in other banks, demand, NOW, savings and money market deposits. The estimated fair value of demand, NOW, savings and money market deposits is the amount payable on demand at the reporting date. Carrying value is used because the accounts have no stated maturity and the customer has the ability to withdraw funds immediately. The carrying amount and estimated fair values for financial instruments as of March 31, 2019 were as follows: Carrying value Estimated fair value Level 1 Level 2 Level 3 Financial assets Securities to be held to maturity $ 281,219,000 $ 282,568,000 $ — $ 282,568,000 $ — Loans (net of allowance for loan losses) Commercial Real estate 353,521,000 347,398,000 — 422,000 346,976,000 Construction 33,852,000 33,266,000 — — 33,266,000 Other 201,459,000 199,700,000 — 5,458,000 194,242,000 Municipal 54,217,000 53,179,000 — — 53,179,000 Residential Term 472,941,000 463,150,000 — 625,000 462,525,000 Construction 18,415,000 18,034,000 — — 18,034,000 Home equity line of credit 94,957,000 92,834,000 — 14,000 92,820,000 Consumer 23,787,000 22,124,000 — — 22,124,000 Total loans 1,253,149,000 1,229,685,000 — 6,519,000 1,223,166,000 Mortgage servicing rights 1,356,000 2,410,000 — 2,410,000 — Financial liabilities Local certificates of deposit $ 293,980,000 $ 293,325,000 $ — $ 293,325,000 $ — National certificates of deposit 418,496,000 419,285,000 — 419,285,000 — Total certificates of deposits 712,476,000 712,610,000 — 712,610,000 — Repurchase agreements 30,309,000 30,276,000 — 30,276,000 — Federal Home Loan Bank advances 140,110,000 139,565,000 — 139,565,000 — Total borrowed funds 170,419,000 169,841,000 — 169,841,000 — The carrying amounts and estimated fair values for financial instruments as of December 31, 2018 were as follows: Carrying value Estimated fair value Level 1 Level 2 Level 3 Financial assets Securities to be held to maturity $ 255,663,000 $ 250,900,000 $ — $ 250,900,000 $ — Loans (net of allowance for loan losses) Commercial Real estate 349,243,000 340,526,000 — 423,000 340,103,000 Construction 27,018,000 26,344,000 — — 26,344,000 Other 192,420,000 189,842,000 — 6,096,000 183,746,000 Municipal 51,101,000 50,965,000 — — 50,965,000 Residential Term 467,760,000 451,323,000 — 793,000 450,530,000 Construction 17,705,000 17,083,000 — — 17,083,000 Home equity line of credit 97,650,000 95,175,000 — 103,000 95,072,000 Consumer 24,154,000 22,530,000 — — 22,530,000 Total loans 1,227,051,000 1,193,788,000 — 7,415,000 1,186,373,000 Mortgage servicing rights 1,354,000 2,586,000 — 2,586,000 — Financial liabilities Local certificates of deposit $ 284,482,000 $ 281,282,000 $ — $ 281,282,000 $ — National certificates of deposit 306,927,000 307,508,000 — 307,508,000 — Total deposits 591,409,000 588,790,000 — 588,790,000 — Repurchase agreements 40,205,000 40,161,000 — 40,161,000 — Federal Home Loan Bank advances 170,112,000 169,240,000 — 169,240,000 — Total borrowed funds 210,317,000 209,401,000 — 209,401,000 — The carrying amount and estimated fair values for financial instruments as of March 31, 2018 were as follows: Carrying value Estimated fair value Level 1 Level 2 Level 3 Financial assets Securities to be held to maturity $ 258,690,000 $ 255,851,000 $ — $ 255,851,000 $ — Loans (net of allowance for loan losses) Commercial Real estate 335,275,000 326,030,000 — 3,000 326,027,000 Construction 43,385,000 42,189,000 — — 42,189,000 Other 173,960,000 171,045,000 — 5,495,000 165,550,000 Municipal 35,440,000 34,972,000 — — 34,972,000 Residential Term 438,765,000 430,023,000 — 334,000 429,689,000 Construction 15,814,000 15,587,000 — 15,587,000 Home equity line of credit 109,525,000 108,047,000 — 106,000 107,941,000 Consumer 24,881,000 24,178,000 — — 24,178,000 Total loans 1,177,045,000 1,152,071,000 — 5,938,000 1,146,133,000 Mortgage servicing rights 1,280,000 2,518,000 — 2,518,000 — Financial liabilities Local certificates of deposit 260,450,000 255,579,000 — 255,579,000 — National certificates of deposit 374,297,000 374,095,000 — 374,095,000 — Total certificates of deposits 634,747,000 629,674,000 — 629,674,000 — Repurchase agreements 67,182,000 64,361,000 — 64,361,000 — Federal Home Loan Bank advances 177,047,000 175,308,000 — 175,308,000 — Total borrowed funds 244,229,000 239,669,000 — 239,669,000 —

Impact of Recently Issued Accou

Impact of Recently Issued Accounting Standards	3 Months Ended
	Mar. 31, 2019
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. The adoption of the ASU did not 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 there was 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. The adoption of this ASU did not 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. In July 2018, the FASB issued ASU No. 2018-11, Leases - Targeted Improvements to provide entities with relief from the costs of implementing certain aspects of the new leasing standard, ASU No. 2016-02. Specifically, under the amendments in ASU 2018-11: (1) entities may elect not to recast the comparative periods presented when transitioning to the new leasing standard, and (2) lessors may elect not to separate lease and non-lease components when certain conditions are met. The amendments have the same effective date as ASU 2016-02. The Company expects to elect both transition options. The adoption of ASU 2018-11 did not have a material effect on the Company’s consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-13, Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. This ASU eliminates, adds and modifies certain disclosure requirements for fair value measurements. Among the changes, entities will no longer be required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but will be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. ASU No. 2018-13 is effective for interim and annual reporting periods beginning after December 15, 2019; early adoption is permitted. Entities are also allowed to elect early adoption the eliminated or modified disclosure requirements and delay adoption of the new disclosure requirements until their effective date. As ASU No. 2018-13 only revises disclosure requirements, it will not have a material impact on the Company’s consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-14, Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans .

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2019
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. The Company is aware that LIBOR may no longer be published after December 31, 2021 and is monitoring the introduction and market acceptance of replacement indices. Each of the interest rate swap contracts the Company has in place are set to mature prior to December 31, 2021.
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 InstrumentsFASB 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. The adoption of the ASU did not 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 there was 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. The adoption of this ASU did not 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. In July 2018, the FASB issued ASU No. 2018-11, Leases - Targeted Improvements to provide entities with relief from the costs of implementing certain aspects of the new leasing standard, ASU No. 2016-02. Specifically, under the amendments in ASU 2018-11: (1) entities may elect not to recast the comparative periods presented when transitioning to the new leasing standard, and (2) lessors may elect not to separate lease and non-lease components when certain conditions are met. The amendments have the same effective date as ASU 2016-02. The Company expects to elect both transition options. The adoption of ASU 2018-11 did not have a material effect on the Company’s consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-13, Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. This ASU eliminates, adds and modifies certain disclosure requirements for fair value measurements. Among the changes, entities will no longer be required to disclose the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, but will be required to disclose the range and weighted average used to develop significant unobservable inputs for Level 3 fair value measurements. ASU No. 2018-13 is effective for interim and annual reporting periods beginning after December 15, 2019; early adoption is permitted. Entities are also allowed to elect early adoption the eliminated or modified disclosure requirements and delay adoption of the new disclosure requirements until their effective date. As ASU No. 2018-13 only revises disclosure requirements, it will not have a material impact on the Company’s consolidated financial statements. In August 2018, the FASB issued ASU No. 2018-14, Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans .

Investment Securities (Tables)

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 : Amortized Cost Unrealized Gains Unrealized Losses Fair Value (Estimated) Securities available for sale U.S. Government-sponsored agencies $ 5,000,000 $ 16,000 $ — $ 5,016,000 Mortgage-backed securities 317,269,000 1,394,000 (3,240,000 ) 315,423,000 State and political subdivisions 4,955,000 4,000 (122,000 ) 4,837,000 $ 327,224,000 $ 1,414,000 $ (3,362,000 ) $ 325,276,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 31,155,000 $ 48,000 $ (280,000 ) $ 30,923,000 Mortgage-backed securities 17,560,000 372,000 (146,000 ) 17,786,000 State and political subdivisions 225,204,000 3,162,000 (1,801,000 ) 226,565,000 Corporate securities 7,300,000 — (6,000 ) 7,294,000 $ 281,219,000 $ 3,582,000 $ (2,233,000 ) $ 282,568,000 Restricted equity securities Federal Home Loan Bank Stock $ 7,945,000 $ — $ — $ 7,945,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 8,982,000 $ — $ — $ 8,982,000 The following table summarizes the amortized cost and estimated fair value of investment securities at December 31, 2018 : Amortized Cost Unrealized Gains Unrealized Losses Fair Value (Estimated) Securities available for sale U.S. Government-sponsored agencies $ 5,000,000 $ 7,000 $ — $ 5,007,000 Mortgage-backed securities 313,854,000 571,000 (6,732,000 ) 307,693,000 State and political subdivisions 4,955,000 — (239,000 ) 4,716,000 $ 323,809,000 $ 578,000 $ (6,971,000 ) $ 317,416,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 11,155,000 $ — $ (472,000 ) $ 10,683,000 Mortgage-backed securities 18,250,000 336,000 (255,000 ) 18,331,000 State and political subdivisions 221,958,000 1,046,000 (5,418,000 ) 217,586,000 Corporate securities 4,300,000 — — 4,300,000 $ 255,663,000 $ 1,382,000 $ (6,145,000 ) $ 250,900,000 Restricted equity securities Federal Home Loan Bank Stock $ 10,549,000 $ — $ — $ 10,549,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 11,586,000 $ — $ — $ 11,586,000 The following table summarizes the amortized cost and estimated fair value of investment securities at March 31, 2018 : Amortized Cost Unrealized Gains Unrealized Losses Fair Value (Estimated) Securities available for sale Mortgage-backed securities $ 302,935,000 $ 191,000 $ (7,798,000 ) $ 295,328,000 State and political subdivisions 5,765,000 3,000 (257,000 ) 5,511,000 $ 308,700,000 $ 194,000 $ (8,055,000 ) $ 300,839,000 Securities to be held to maturity U.S. Government-sponsored agencies $ 11,155,000 $ — $ (515,000 ) $ 10,640,000 Mortgage-backed securities 21,990,000 469,000 (289,000 ) 22,170,000 State and political subdivisions 221,245,000 1,497,000 (4,001,000 ) 218,741,000 Corporate securities 4,300,000 — — 4,300,000 $ 258,690,000 $ 1,966,000 $ (4,805,000 ) $ 255,851,000 Restricted equity securities Federal Home Loan Bank Stock $ 10,910,000 $ — $ — $ 10,910,000 Federal Reserve Bank Stock 1,037,000 — — 1,037,000 $ 11,947,000 $ — $ — $ 11,947,000
Contractual Maturities of Investment Securities	The following table summarizes the contractual maturities of investment securities at March 31, 2019 : 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 $ — $ — $ 1,429,000 $ 1,431,000 Due in 1 to 5 years 15,670,000 15,736,000 21,096,000 21,203,000 Due in 5 to 10 years 107,978,000 108,698,000 176,967,000 178,044,000 Due after 10 years 203,576,000 200,842,000 81,727,000 81,890,000 $ 327,224,000 $ 325,276,000 $ 281,219,000 $ 282,568,000 The following table summarizes the contractual maturities of investment securities at December 31, 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 $ — $ — $ 1,432,000 $ 1,433,000 Due in 1 to 5 years 13,501,000 13,518,000 20,717,000 20,778,000 Due in 5 to 10 years 83,954,000 83,326,000 157,544,000 155,313,000 Due after 10 years 226,354,000 220,572,000 75,970,000 73,376,000 $ 323,809,000 $ 317,416,000 $ 255,663,000 $ 250,900,000 The following table summarizes the contractual maturities of investment securities at March 31, 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 $ 61,000 $ 61,000 $ 634,000 $ 635,000 Due in 1 to 5 years 6,502,000 6,492,000 25,692,000 25,796,000 Due in 5 to 10 years 66,434,000 65,234,000 145,297,000 144,211,000 Due after 10 years 235,703,000 229,052,000 87,067,000 85,209,000 $ 308,700,000 $ 300,839,000 $ 258,690,000 $ 255,851,000
Schedule of Securities Gains and Losses	The following table shows securities gains and losses for the three months ended March 31, 2019 and 2018 : For the three months ended March 31, 2019 2018 Proceeds from sales of securities $ — $ 459,000 Gross realized gains — 136,000 Gross realized losses — — Net gain $ — $ 136,000 Related income taxes $ — $ 29,000
Schedule of Securities Temporarily Impaired	Information regarding securities temporarily impaired as of March 31, 2019 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 $ — $ — $ 10,875,000 $ (280,000 ) $ 10,875,000 $ (280,000 ) Mortgage-backed securities 24,525,000 (138,000 ) 198,272,000 (3,248,000 ) 222,797,000 (3,386,000 ) State and political subdivisions 1,264,000 (3,000 ) 58,168,000 (1,920,000 ) 59,432,000 (1,923,000 ) Corporate securities 2,994,000 (6,000 ) — — 2,994,000 (6,000 ) $ 28,783,000 $ (147,000 ) $ 267,315,000 $ (5,448,000 ) $ 296,098,000 $ (5,595,000 ) As of December 31, 2018 , there were 511 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 232 had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of December 31, 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 $ — $ — $ 10,683,000 $ (472,000 ) $ 10,683,000 $ (472,000 ) Mortgage-backed securities 76,050,000 (1,061,000 ) 185,136,000 (5,926,000 ) 261,186,000 (6,987,000 ) State and political subdivisions 76,809,000 (1,784,000 ) 45,052,000 (3,873,000 ) 121,861,000 (5,657,000 ) $ 152,859,000 $ (2,845,000 ) $ 240,871,000 $ (10,271,000 ) $ 393,730,000 $ (13,116,000 ) As of March 31, 2018 , there were 457 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 159 had been temporarily impaired for 12 months or more. Information regarding securities temporarily impaired as of March 31, 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 $ 6,946,000 $ (309,000 ) $ 3,694,000 $ (206,000 ) $ 10,640,000 $ (515,000 ) Mortgage-backed securities 183,335,000 (4,332,000 ) 101,012,000 (3,755,000 ) 284,347,000 (8,087,000 ) State and political subdivisions 64,594,000 (1,533,000 ) 37,182,000 (2,725,000 ) 101,776,000 (4,258,000 ) $ 254,875,000 $ (6,174,000 ) $ 141,888,000 $ (6,686,000 ) $ 396,763,000 $ (12,860,000 )

Loans (Tables)

Loans (Tables)	3 Months Ended
	Mar. 31, 2019
Loans and Leases Receivable Disclosure [Abstract]
Composition of Loan Portfolio	The following table shows the composition of the Company's loan portfolio as of March 31, 2019 and 2018 and at December 31, 2018 : March 31, 2019 December 31, 2018 March 31, 2018 Commercial Real estate $ 357,760,000 28.3 % $ 353,243,000 28.5 % $ 339,306,000 28.6 % Construction 34,231,000 2.7 % 27,304,000 2.2 % 43,813,000 3.7 % Other 205,462,000 16.2 % 196,391,000 15.9 % 177,783,000 15.0 % Municipal 54,246,000 4.3 % 51,128,000 4.1 % 35,463,000 3.0 % Residential Term 474,241,000 37.5 % 469,145,000 37.9 % 439,984,000 37.0 % Construction 18,450,000 1.5 % 17,743,000 1.4 % 15,847,000 1.3 % Home equity line of credit 95,692,000 7.6 % 98,469,000 8.0 % 110,298,000 9.3 % Consumer 24,557,000 1.9 % 24,860,000 2.0 % 25,508,000 2.1 % Total $ 1,264,639,000 100.0 % $ 1,238,283,000 100.0 % $ 1,188,002,000 100.0 %
Past Due Loans Aging	Information on the past-due status of loans by class of financing receivable as of March 31, 2019 , 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 $ 282,000 $ 825,000 $ 621,000 $ 1,728,000 $ 356,032,000 $ 357,760,000 $ — Construction 47,000 — 286,000 333,000 33,898,000 34,231,000 — Other 664,000 63,000 303,000 1,030,000 204,432,000 205,462,000 — Municipal — — — — 54,246,000 54,246,000 — Residential Term 2,659,000 1,153,000 1,434,000 5,246,000 468,995,000 474,241,000 — Construction — — — — 18,450,000 18,450,000 — Home equity line of credit 1,985,000 11,000 369,000 2,365,000 93,327,000 95,692,000 — Consumer 411,000 163,000 4,000 578,000 23,979,000 24,557,000 4,000 Total $ 6,048,000 $ 2,215,000 $ 3,017,000 $ 11,280,000 $ 1,253,359,000 $ 1,264,639,000 $ 4,000 Information on the past-due status of loans by class of financing receivable as of December 31, 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 $ 1,274,000 $ — $ 777,000 $ 2,051,000 $ 351,192,000 $ 353,243,000 $ — Construction — 10,000 — 10,000 27,294,000 27,304,000 — Other 455,000 5,000 120,000 580,000 195,811,000 196,391,000 — Municipal — — — — 51,128,000 51,128,000 — Residential Term 1,097,000 3,518,000 2,023,000 6,638,000 462,507,000 469,145,000 339,000 Construction 76,000 — — 76,000 17,667,000 17,743,000 — Home equity line of credit 2,819,000 419,000 493,000 3,731,000 94,738,000 98,469,000 — Consumer 237,000 25,000 27,000 289,000 24,571,000 24,860,000 12,000 Total $ 5,958,000 $ 3,977,000 $ 3,440,000 $ 13,375,000 $ 1,224,908,000 $ 1,238,283,000 $ 351,000 Information on the past-due status of loans by class of financing receivable as of March 31, 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 $ 963,000 $ 17,000 $ 202,000 $ 1,182,000 $ 338,124,000 $ 339,306,000 $ — Construction 347,000 — — 347,000 43,466,000 43,813,000 — Other 6,887,000 52,000 294,000 7,233,000 170,550,000 177,783,000 — Municipal — — — — 35,463,000 35,463,000 — Residential Term 3,175,000 345,000 1,880,000 5,400,000 434,584,000 439,984,000 — Construction — — — — 15,847,000 15,847,000 — Home equity line of credit 449,000 438,000 664,000 1,551,000 108,747,000 110,298,000 126,000 Consumer 119,000 8,000 27,000 154,000 25,354,000 25,508,000 11,000 Total $ 11,940,000 $ 860,000 $ 3,067,000 $ 15,867,000 $ 1,172,135,000 $ 1,188,002,000 $ 137,000
Nonaccrual Loans	Information on nonaccrual loans as of March 31, 2019 and 2018 and at December 31, 2018 is presented in the following table: March 31, 2019 December 31, 2018 March 31, 2018 Commercial Real estate $ 1,468,000 $ 1,226,000 $ 1,021,000 Construction 286,000 — — Other 7,067,000 8,664,000 8,895,000 Municipal — — — Residential Term 4,211,000 4,062,000 3,654,000 Construction — — — Home equity line of credit 702,000 760,000 697,000 Consumer 2,000 15,000 16,000 Total $ 13,736,000 $ 14,727,000 $ 14,283,000
Impaired Loans by Class of Financing Receivable	A breakdown of impaired loans by class of financing receivable as of and for the period ended March 31, 2019 is presented in the following table: For the three months ended March 31, 2019 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 8,391,000 $ 8,779,000 $ — $ 8,741,000 $ 90,000 Construction 1,007,000 1,007,000 — 817,000 12,000 Other 709,000 734,000 — 1,207,000 6,000 Municipal — — — — — Residential Term 8,926,000 10,345,000 — 9,007,000 68,000 Construction — — — — — Home equity line of credit 1,009,000 1,071,000 — 976,000 5,000 Consumer — — — — — $ 20,042,000 $ 21,936,000 $ — $ 20,748,000 $ 181,000 With an Allowance Recorded Commercial Real estate $ 1,566,000 $ 1,583,000 $ 233,000 $ 1,215,000 $ 26,000 Construction — — — — — Other 6,944,000 7,315,000 1,485,000 7,511,000 — Municipal — — — — — Residential Term 1,993,000 2,131,000 348,000 1,845,000 17,000 Construction — — — — — Home equity line of credit 21,000 25,000 7,000 29,000 — Consumer 2,000 2,000 2,000 1,000 — $ 10,526,000 $ 11,056,000 $ 2,075,000 $ 10,601,000 $ 43,000 Total Commercial Real estate $ 9,957,000 $ 10,362,000 $ 233,000 $ 9,956,000 $ 116,000 Construction 1,007,000 1,007,000 — 817,000 12,000 Other 7,653,000 8,049,000 1,485,000 8,718,000 6,000 Municipal — — — — — Residential Term 10,919,000 12,476,000 348,000 10,852,000 85,000 Construction — — — — — Home equity line of credit 1,030,000 1,096,000 7,000 1,005,000 5,000 Consumer 2,000 2,000 2,000 1,000 — $ 30,568,000 $ 32,992,000 $ 2,075,000 $ 31,349,000 $ 224,000 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, 2018 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 $ 8,718,000 $ 9,161,000 $ — $ 5,536,000 $ 380,000 Construction 721,000 721,000 — 762,000 43,000 Other 1,468,000 1,555,000 — 2,037,000 32,000 Municipal — — — — — Residential Term 9,136,000 10,317,000 — 9,427,000 289,000 Construction — — — — — Home equity line of credit 972,000 1,035,000 — 1,001,000 20,000 Consumer 15,000 42,000 — 13,000 — $ 21,030,000 $ 22,831,000 $ — $ 18,776,000 $ 764,000 With an Allowance Recorded Commercial Real estate $ 1,042,000 $ 1,059,000 $ 260,000 $ 3,477,000 $ 42,000 Construction — — — — — Other 7,791,000 8,216,000 1,696,000 7,471,000 5,000 Municipal — — — — — Residential Term 1,768,000 1,998,000 335,000 1,982,000 53,000 Construction — — — — — Home equity line of credit 120,000 124,000 17,000 99,000 — Consumer — — — — — $ 10,721,000 $ 11,397,000 $ 2,308,000 $ 13,029,000 $ 100,000 Total Commercial Real estate $ 9,760,000 $ 10,220,000 $ 260,000 $ 9,013,000 $ 422,000 Construction 721,000 721,000 — 762,000 43,000 Other 9,259,000 9,771,000 1,696,000 9,508,000 37,000 Municipal — — — — — Residential Term 10,904,000 12,315,000 335,000 11,409,000 342,000 Construction — — — — — Home equity line of credit 1,092,000 1,159,000 17,000 1,100,000 20,000 Consumer 15,000 42,000 — 13,000 — $ 31,751,000 $ 34,228,000 $ 2,308,000 $ 31,805,000 $ 864,000 A breakdown of impaired loans by class of financing receivable as of and for the period ended March 31, 2018 is presented in the following table: For the three months ended March 31, 2018 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Recognized Interest Income With No Related Allowance Commercial Real estate $ 5,054,000 $ 5,269,000 $ — $ 4,163,000 $ 54,000 Construction 741,000 741,000 — 741,000 10,000 Other 2,281,000 2,360,000 — 2,302,000 6,000 Municipal — — — — — Residential Term 9,594,000 10,733,000 — 9,700,000 71,000 Construction — — — — — Home equity line of credit 917,000 1,008,000 — 1,090,000 5,000 Consumer 16,000 29,000 — 16,000 — $ 18,603,000 $ 20,140,000 $ — $ 18,012,000 $ 146,000 With an Allowance Recorded Commercial Real estate $ 3,897,000 $ 4,002,000 $ 254,000 $ 3,889,000 $ 39,000 Construction — — — — — Other 7,159,000 7,324,000 1,664,000 7,182,000 — Municipal — — — — — Residential Term 1,934,000 2,146,000 272,000 1,968,000 24,000 Construction — — — — — Home equity line of credit 122,000 125,000 16,000 70,000 — Consumer — — — — — $ 13,112,000 $ 13,597,000 $ 2,206,000 $ 13,109,000 $ 63,000 Total Commercial Real estate $ 8,951,000 $ 9,271,000 $ 254,000 $ 8,052,000 $ 93,000 Construction 741,000 741,000 — 741,000 10,000 Other 9,440,000 9,684,000 1,664,000 9,484,000 6,000 Municipal — — — — — Residential Term 11,528,000 12,879,000 272,000 11,668,000 95,000 Construction — — — — — Home equity line of credit 1,039,000 1,133,000 16,000 1,160,000 5,000 Consumer 16,000 29,000 — 16,000 — $ 31,715,000 $ 33,737,000 $ 2,206,000 $ 31,121,000 $ 209,000
Troubled Debt Restructurings on Financing Receivables	The following table shows TDRs by class and the specific reserve as of March 31, 2019 : Number of Loans Balance Specific Reserves Commercial Real estate 17 $ 8,583,000 $ 107,000 Construction 1 721,000 — Other 10 7,257,000 1,275,000 Municipal — — — Residential Term 49 8,331,000 225,000 Construction — — — Home equity line of credit 3 494,000 — Consumer — — — 80 $ 25,386,000 $ 1,607,000 The following table shows TDRs by class and the specific reserve as of December 31, 2018 : Number of Loans Balance Specific Reserves Commercial Real estate 17 $ 8,631,000 $ 132,000 Construction 1 721,000 — Other 10 7,298,000 1,276,000 Municipal — — — Residential Term 45 8,074,000 160,000 Construction — — — Home equity line of credit 3 498,000 — Consumer — — — 76 $ 25,222,000 $ 1,568,000 The following table shows TDRs by class and the specific reserve as of March 31, 2018 : Number of Loans Balance Specific Reserves Commercial Real estate 15 $ 8,030,000 $ 132,000 Construction 1 741,000 — Other 4 546,000 — Municipal — — — Residential Term 46 8,883,000 271,000 Construction — — — Home equity line of credit 3 509,000 — Consumer — — — 69 $ 18,709,000 $ 403,000 As of March 31, 2019 , 10 of the loans classified as TDRs with a total balance of $1,129,000 were more than 30 days past due. Of these loans, three 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 March 31, 2019 : Number of Loans Balance Specific Reserves Commercial Real estate — $ — $ — Construction — — — Other 4 261,000 134,000 Municipal — — — Residential Term 5 701,000 36,000 Construction — — — Home equity line of credit 1 167,000 — Consumer — — — 10 $ 1,129,000 $ 170,000 As of March 31, 2018 , seven of the loans classified as TDRs with a total balance of $810,000 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 March 31, 2018 : Number of Loans Balance Specific Reserves Commercial Real estate — $ — $ — Construction — — — Other — — — Municipal — — — Residential Term 6 643,000 45,000 Construction — — — Home equity line of credit 1 167,000 — Consumer — — — 7 $ 810,000 $ 45,000 For the three months ended March 31, 2019 , five 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 March 31, 2019 : Number of Loans Pre-Modification Post-Modification Outstanding Specific Reserves Commercial Real estate — $ — $ — $ — Construction — — — — Other — — — — Municipal — — — — Residential Term 5 573,000 554,000 74,000 Construction — — — — Home equity line of credit — — — — Consumer — — — — 5 $ 573,000 $ 554,000 $ 74,000 For the three months ended March 31, 2018 , seven loans were placed on TDR status. The following table shows these TDRs by class and associated specific reserves included in the allowance for loan losses as of March 31, 2018 . Number of Loans Pre-Modification Post-Modification Outstanding Specific Reserves Commercial Real estate 7 $ 1,056,000 $ 1,056,000 $ 36,000 Construction — — — — Other — — — — Municipal — — — — Residential Term — — — — Construction — — — — Home equity line of credit — — — — Consumer — — — — 7 $ 1,056,000 $ 1,056,000 $ 36,000

Allowance for Loan Losses (Tabl

Allowance for Loan Losses (Tables)	3 Months Ended
	Mar. 31, 2019
Receivables [Abstract]
Allowance for Loan Losses by Class of Financing Receivable and Allowance	A breakdown of the allowance for loan losses as of March 31, 2019 , December 31, 2018 , and March 31, 2018 , by class of financing receivable and allowance element, is presented in the following tables: As of March 31, 2019 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 $ 233,000 $ 790,000 $ 2,609,000 $ — $ 3,632,000 Construction — 76,000 249,000 — 325,000 Other 1,485,000 452,000 1,493,000 — 3,430,000 Municipal — — 25,000 — 25,000 Residential Term 348,000 182,000 584,000 — 1,114,000 Construction — 7,000 23,000 — 30,000 Home equity line of credit 7,000 158,000 465,000 — 630,000 Consumer 2,000 290,000 368,000 — 660,000 Unallocated — — — 1,644,000 1,644,000 $ 2,075,000 $ 1,955,000 $ 5,816,000 $ 1,644,000 $ 11,490,000 As of December 31, 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 $ 260,000 $ 742,000 $ 2,565,000 $ — $ 3,567,000 Construction — 57,000 198,000 — 255,000 Other 1,696,000 414,000 1,431,000 — 3,541,000 Municipal — — 24,000 — 24,000 Residential Term 335,000 326,000 574,000 — 1,235,000 Construction — 12,000 22,000 — 34,000 Home equity line of credit 17,000 263,000 450,000 — 730,000 Consumer — 271,000 359,000 — 630,000 Unallocated — — — 1,216,000 1,216,000 $ 2,308,000 $ 2,085,000 $ 5,623,000 $ 1,216,000 $ 11,232,000 As of March 31, 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 $ 254,000 $ 1,039,000 $ 2,439,000 $ — $ 3,732,000 Construction — 81,000 315,000 — 396,000 Other 1,664,000 597,000 1,279,000 — 3,540,000 Municipal — — 21,000 — 21,000 Residential Term 272,000 303,000 554,000 — 1,129,000 Construction — 11,000 20,000 — 31,000 Home equity line of credit 16,000 297,000 403,000 — 716,000 Consumer — 265,000 316,000 — 581,000 Unallocated — — — 811,000 811,000 $ 2,206,000 $ 2,593,000 $ 5,347,000 $ 811,000 $ 10,957,000
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 March 31, 2019 : Commercial Real Estate Commercial Construction Commercial Other Municipal Loans All Risk- Rated Loans 1 Strong $ — $ — $ 3,630,000 $ 43,000 $ 3,673,000 2 Above Average 10,097,000 36,000 4,447,000 51,806,000 66,386,000 3 Satisfactory 82,595,000 2,352,000 43,963,000 450,000 129,360,000 4 Average 179,290,000 23,267,000 89,825,000 1,947,000 294,329,000 5 Watch 63,503,000 8,290,000 50,619,000 — 122,412,000 6 OAEM 2,847,000 — 1,993,000 — 4,840,000 7 Substandard 19,305,000 286,000 10,985,000 — 30,576,000 8 Doubtful 123,000 — — — 123,000 Total $ 357,760,000 $ 34,231,000 $ 205,462,000 $ 54,246,000 $ 651,699,000 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, 2018 : Commercial Real Estate Commercial Construction Commercial Other Municipal Loans All Risk- Rated Loans 1 Strong $ — $ — $ 3,444,000 $ — $ 3,444,000 2 Above Average 10,484,000 37,000 4,564,000 48,800,000 63,885,000 3 Satisfactory 80,266,000 2,231,000 46,090,000 518,000 129,105,000 4 Average 172,597,000 18,780,000 82,081,000 1,810,000 275,268,000 5 Watch 66,325,000 5,970,000 45,546,000 — 117,841,000 6 OAEM 6,890,000 — 1,805,000 — 8,695,000 7 Substandard 16,558,000 286,000 12,861,000 — 29,705,000 8 Doubtful 123,000 — — — 123,000 Total $ 353,243,000 $ 27,304,000 $ 196,391,000 $ 51,128,000 $ 628,066,000 The following table summarizes the risk ratings for the Company's commercial real estate, commercial construction, commercial other, and municipal loans as of March 31, 2018 : Commercial Real Estate Commercial Construction Commercial Other Municipal Loans All Risk- Rated Loans 1 Strong $ — $ — $ 1,251,000 $ — $ 1,251,000 2 Above Average 12,308,000 40,000 5,528,000 33,875,000 51,751,000 3 Satisfactory 74,612,000 4,776,000 38,738,000 653,000 118,779,000 4 Average 183,675,000 21,585,000 79,751,000 935,000 285,946,000 5 Watch 46,918,000 17,412,000 35,743,000 — 100,073,000 6 OAEM 3,148,000 — 1,866,000 — 5,014,000 7 Substandard 18,522,000 — 14,906,000 — 33,428,000 8 Doubtful 123,000 — — — 123,000 Total $ 339,306,000 $ 43,813,000 $ 177,783,000 $ 35,463,000 $ 596,365,000
Allowance for Loan Losses Transactions	The following table presents allowance for loan losses activity by class for the three months and quarter ended March 31, 2019 , and allowance for loan loss balances by class and related loan balances by class as of March 31, 2019 : Commercial Municipal Residential Home Equity Line of Credit Consumer Unallocated Total Real Estate Construction Other Term Construction For the three months ended March 31, 2019 Beginning balance $ 3,567,000 $ 255,000 $ 3,541,000 $ 24,000 $ 1,235,000 $ 34,000 $ 730,000 $ 630,000 $ 1,216,000 $ 11,232,000 Charge offs — — 1,000 — 49,000 — 38,000 63,000 — 151,000 Recoveries 8,000 — 1,000 — 3,000 — 1,000 21,000 — 34,000 Provision (credit) 57,000 70,000 (111,000 ) 1,000 (75,000 ) (4,000 ) (63,000 ) 72,000 428,000 375,000 Ending balance $ 3,632,000 $ 325,000 $ 3,430,000 $ 25,000 $ 1,114,000 $ 30,000 $ 630,000 $ 660,000 $ 1,644,000 $ 11,490,000 Allowance for loan losses as of March 31, 2019 Ending balance specifically evaluated for impairment $ 233,000 $ — $ 1,485,000 $ — $ 348,000 $ — $ 7,000 $ 2,000 $ — $ 2,075,000 Ending balance collectively evaluated for impairment $ 3,399,000 $ 325,000 $ 1,945,000 $ 25,000 $ 766,000 $ 30,000 $ 623,000 $ 658,000 $ 1,644,000 $ 9,415,000 Related loan balances as of March 31, 2019 Ending balance $ 357,760,000 $ 34,231,000 $ 205,462,000 $ 54,246,000 $ 474,241,000 $ 18,450,000 $ 95,692,000 $ 24,557,000 $ — $ 1,264,639,000 Ending balance specifically evaluated for impairment $ 9,957,000 $ 1,007,000 $ 7,653,000 $ — $ 10,919,000 $ — $ 1,030,000 $ 2,000 $ — $ 30,568,000 Ending balance collectively evaluated for impairment $ 347,803,000 $ 33,224,000 $ 197,809,000 $ 54,246,000 $ 463,322,000 $ 18,450,000 $ 94,662,000 $ 24,555,000 $ — $ 1,234,071,000 The following table presents allowance for loan losses activity by class for the year ended December 31, 2018 and allowance for loan loss balances by class and related loan balances by class as of December 31, 2018 : Commercial Municipal Residential Home Equity Line of Credit Consumer Unallocated Total Real Estate Construction Other Term Construction For the year ended December 31, 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 168,000 — 423,000 — 213,000 — 121,000 348,000 — 1,273,000 Recoveries 52,000 — 40,000 — 64,000 — 24,000 96,000 — 276,000 Provision (credit) (189,000 ) (179,000 ) 566,000 4,000 254,000 (2,000 ) 135,000 337,000 574,000 1,500,000 Ending balance $ 3,567,000 $ 255,000 $ 3,541,000 $ 24,000 $ 1,235,000 $ 34,000 $ 730,000 $ 630,000 $ 1,216,000 $ 11,232,000 Allowance for loan losses as of December 31, 2018 Ending balance specifically evaluated for impairment $ 260,000 $ — $ 1,696,000 $ — $ 335,000 $ — $ 17,000 $ — $ — $ 2,308,000 Ending balance collectively evaluated for impairment $ 3,307,000 $ 255,000 $ 1,845,000 $ 24,000 $ 900,000 $ 34,000 $ 713,000 $ 630,000 $ 1,216,000 $ 8,924,000 Related loan balances as of December 31, 2018 Ending balance $ 353,243,000 $ 27,304,000 $ 196,391,000 $ 51,128,000 $ 469,145,000 $ 17,743,000 $ 98,469,000 $ 24,860,000 $ — $ 1,238,283,000 Ending balance specifically evaluated for impairment $ 9,760,000 $ 721,000 $ 9,259,000 $ — $ 10,904,000 $ — $ 1,092,000 $ 15,000 $ — $ 31,751,000 Ending balance collectively evaluated for impairment $ 343,483,000 $ 26,583,000 $ 187,132,000 $ 51,128,000 $ 458,241,000 $ 17,743,000 $ 97,377,000 $ 24,845,000 $ — $ 1,206,532,000 The following table presents allowance for loan losses activity by class for the three months and quarter ended March 31, 2018 , and allowance for loan loss balances by class and related loan balances by class as of March 31, 2018 : Commercial Municipal Residential Home Equity Line of Credit Consumer Unallocated Total Real Estate Construction Other Term Construction For the three months ended March 31, 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 — 81,000 — 115,000 105,000 — 318,000 Recoveries — — 6,000 — 4,000 — 11,000 25,000 — 46,000 Provision (credit) (140,000 ) (38,000 ) 193,000 1,000 76,000 (5,000 ) 128,000 116,000 169,000 500,000 Ending 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 Allowance for loan losses as of March 31, 2018 Ending balance specifically evaluated for impairment $ 254,000 $ — $ 1,664,000 $ — $ 272,000 $ — $ 16,000 $ — $ — $ 2,206,000 Ending balance collectively evaluated for impairment $ 3,478,000 $ 396,000 $ 1,876,000 $ 21,000 $ 857,000 $ 31,000 $ 700,000 $ 581,000 $ 811,000 $ 8,751,000 Related loan balances as of March 31, 2018 Ending balance $ 339,306,000 $ 43,813,000 $ 177,783,000 $ 35,463,000 $ 439,984,000 $ 15,847,000 $ 110,298,000 $ 25,508,000 $ — $ 1,188,002,000 Ending balance specifically evaluated for impairment $ 8,951,000 $ 741,000 $ 9,440,000 $ — $ 11,528,000 $ — $ 1,039,000 $ 16,000 $ — $ 31,715,000 Ending balance collectively evaluated for impairment $ 330,355,000 $ 43,072,000 $ 168,343,000 $ 35,463,000 $ 428,456,000 $ 15,847,000 $ 109,259,000 $ 25,492,000 $ — $ 1,156,287,000

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Nonvested Restricted Stock Units Activity	As of March 31, 2019 , 163,192 shares of restricted stock had been granted under the 2010 Plan, of which 75,804 shares remain restricted as of March 31, 2019 as detailed in the following table: Year Granted Vesting Term (In Years) Shares Remaining Term (In Years) 2015 5.0 12,023 0.9 2016 5.0 15,015 1.8 2017 3.0 4,902 0.9 2017 5.0 9,972 2.8 2018 2.0 932 0.8 2018 3.0 2,150 1.9 2018 4.0 2,068 2.8 2018 5.0 9,655 3.8 2019 1.0 1,349 0.8 2019 2.0 1,484 1.8 2019 3.0 16,254 2.8 75,804 2.1

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2019
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 three months ended March 31, 2019 and 2018 : Income (Numerator) Shares (Denominator) Per-Share Amount For the three months ended March 31, 2019 Net income as reported $ 6,156,000 Basic EPS: Income available to common shareholders 6,156,000 10,802,782 $ 0.57 Effect of dilutive securities: restricted stock 73,953 Diluted EPS: Income available to common shareholders plus assumed conversions $ 6,156,000 10,876,735 $ 0.57 For the three months ended March 31, 2018 Net income as reported $ 5,506,000 Basic EPS: Income available to common shareholders 5,506,000 10,771,271 $ 0.51 Effect of dilutive securities: restricted stock 73,228 Diluted EPS: Income available to common shareholders plus assumed conversions $ 5,506,000 10,844,499 $ 0.51

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2019
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 three months ended March 31, 2019 2018 Change in benefit obligation Benefit obligation at beginning of year $ 1,599,000 $ 1,874,000 Interest cost 17,000 19,000 Benefits paid (28,000 ) (28,000 ) Benefit obligation at end of period $ 1,588,000 $ 1,865,000 Funded status Benefit obligation at end of period $ (1,588,000 ) $ (1,865,000 ) Unamortized (gain) loss (47,000 ) 186,000 Accrued benefit cost at end of period $ (1,635,000 ) $ (1,679,000 )
Schedule of net pension costs	The following table sets forth the net periodic pension cost: For the three months ended March 31, 2019 2018 Components of net periodic benefit cost Interest cost $ 17,000 $ 19,000 Net periodic benefit cost $ 17,000 $ 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: March 31, December 31, 2018 March 31, Unamortized net actuarial gain (loss) $ 47,000 $ 47,000 $ (186,000 ) Deferred tax (benefit) expense (10,000 ) (10,000 ) 39,000 Net unrecognized postretirement benefits included in accumulated other comprehensive income (loss) $ 37,000 $ 37,000 $ (147,000 )

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Schedule of Accumulated 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 three months March 31, 2019 and 2018 . For the three months ended March 31, 2019 2018 Balance at beginning of period $ (5,051,000 ) $ (2,901,000 ) Unrealized gains (losses) arising during the period 4,446,000 (4,052,000 ) Reclassification of realized gains during the period — (136,000 ) Related deferred taxes (934,000 ) 879,000 Net change 3,512,000 (3,309,000 ) Balance at end of period $ (1,539,000 ) $ (6,210,000 ) three months March 31, 2019 and 2018 . For the three months ended March 31, 2019 2018 Balance at beginning of period $ (197,000 ) $ (174,000 ) Amortization of net unrealized gains (losses) 4,000 (10,000 ) Related deferred taxes (1,000 ) 2,000 Net change 3,000 (8,000 ) Balance at end of period $ (194,000 ) $ (182,000 ) The following table presents the effect of the Company's derivative financial instruments included in other comprehensive income (loss) for the three months March 31, 2019 and 2018 . For the three months ended March 31, 2019 2018 Balance at beginning of period $ 1,438,000 $ 1,544,000 Unrealized gains (losses) on cash flow hedging derivatives arising during the period (589,000 ) 486,000 Related deferred taxes 124,000 (102,000 ) Net change (465,000 ) 384,000 Balance at end of period $ 973,000 $ 1,928,000 The following table summarizes activity in the unrealized gain or loss on postretirement benefits included in other comprehensive income (loss) for the three months March 31, 2019 and 2018 . For the three months ended March 31, 2019 2018 Unrecognized postretirement benefits at beginning of period $ 37,000 $ (147,000 ) Amortization of unrecognized transition obligation — — Change in unamortized net actuarial gain (loss) — — Related deferred taxes — — Unrecognized postretirement benefits at end of period $ 37,000 $ (147,000 )

Financial Derivative Instrume_2

Financial Derivative Instruments (Tables)	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The details of the interest rate swap agreements are as follows: March 31, 2019 December 31, 2018 March 31, 2018 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 % $ 847,000 $ 1,110,000 $ 1,447,000 20,000,000 June 27, 2016 June 27, 2021 1-Month USD LIBOR 0.893 % 586,000 763,000 994,000 25,000,000 June 5, 2018 December 5, 2019 1-Month USD LIBOR 2.466 % (7,000 ) 16,000 — 25,000,000 June 5, 2018 June 5, 2020 1-Month USD LIBOR 2.547 % (57,000 ) (9,000 ) — 25,000,000 June 5, 2018 December 5, 2020 1-Month USD LIBOR 2.603 % (137,000 ) (60,000 ) — $ 125,000,000 $ 1,232,000 $ 1,820,000 $ 2,441,000 (1)

Mortgage Servicing Rights (Tabl

Mortgage Servicing Rights (Tables)	3 Months Ended
	Mar. 31, 2019
Transfers and Servicing [Abstract]
Reconciliation of Mortgage Servicing Assets	Mortgage servicing rights are included in other assets and detailed in the following table: March 31, December 31, March 31, Mortgage servicing rights $ 5,776,000 $ 5,718,000 $ 5,489,000 Accumulated amortization (4,420,000 ) (4,364,000 ) (4,209,000 ) Impairment reserve — — — $ 1,356,000 $ 1,354,000 $ 1,280,000

Certificates of Deposit (Tables

Certificates of Deposit (Tables)	3 Months Ended
	Mar. 31, 2019
Banking and Thrift [Abstract]
Certificates of Deposit	The following table represents the breakdown of certificates of deposit at March 31, 2019 and 2018 , and at December 31, 2018 : March 31, 2019 December 31, 2018 March 31, 2018 Certificates of deposit < $100,000 $ 398,689,000 $ 372,464,000 $ 347,010,000 Certificates $100,000 to $250,000 238,429,000 162,185,000 240,492,000 Certificates $250,000 and over 75,358,000 56,760,000 47,245,000 $ 712,476,000 $ 591,409,000 $ 634,747,000

Fair Value (Tables)

Fair Value (Tables)	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 , December 31, 2018 and March 31, 2018 . At March 31, 2019 Level 1 Level 2 Level 3 Total Securities available for sale U.S. Government-sponsored agencies $ — $ 5,016,000 $ — $ 5,016,000 Mortgage-backed securities — 315,423,000 — 315,423,000 State and political subdivisions — 4,837,000 — 4,837,000 Total securities available for sale — 325,276,000 — 325,276,000 Interest rate swap agreements — 1,232,000 — 1,232,000 Total assets $ — $ 326,508,000 $ — $ 326,508,000 At December 31, 2018 Level 1 Level 2 Level 3 Total Securities available for sale U.S. Government-sponsored agencies $ — $ 5,007,000 $ — $ 5,007,000 Mortgage-backed securities — 307,693,000 — 307,693,000 State and political subdivisions — 4,716,000 — 4,716,000 Total securities available for sale — 317,416,000 — 317,416,000 Interest rate swap agreements — 1,820,000 — 1,820,000 Total assets $ — $ 319,236,000 $ — $ 319,236,000 At March 31, 2018 Level 1 Level 2 Level 3 Total Securities available for sale Mortgage-backed securities $ — $ 295,328,000 $ — $ 295,328,000 State and political subdivisions — 5,511,000 — 5,511,000 Total securities available for sale — 300,839,000 — 300,839,000 Interest rate swap agreements — 2,441,000 — 2,441,000 Total assets $ — $ 303,280,000 $ — $ 303,280,000
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 $0 at March 31, 2019, 2018 and December 31, 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 $1,822,000 , $2,096,000 and $1,924,000 at March 31, 2019 , December 31, 2018 , and March 31, 2018 , respectively. At March 31, 2019 Level 1 Level 2 Level 3 Total Other real estate owned $ — $ 584,000 $ — $ 584,000 Impaired loans — 6,519,000 — 6,519,000 Total assets $ — $ 7,103,000 $ — $ 7,103,000 At December 31, 2018 Level 1 Level 2 Level 3 Total Other real estate owned $ — $ 584,000 $ — $ 584,000 Impaired loans — 7,415,000 — 7,415,000 Total assets $ — $ 7,999,000 $ — $ 7,999,000 At March 31, 2018 Level 1 Level 2 Level 3 Total Other real estate owned $ — $ 1,121,000 $ — $ 1,121,000 Impaired loans — 5,938,000 — 5,938,000 Total assets $ — $ 7,059,000 $ — $ 7,059,000
Estimated Fair Value of Financial Instruments	The carrying amount and estimated fair values for financial instruments as of March 31, 2019 were as follows: Carrying value Estimated fair value Level 1 Level 2 Level 3 Financial assets Securities to be held to maturity $ 281,219,000 $ 282,568,000 $ — $ 282,568,000 $ — Loans (net of allowance for loan losses) Commercial Real estate 353,521,000 347,398,000 — 422,000 346,976,000 Construction 33,852,000 33,266,000 — — 33,266,000 Other 201,459,000 199,700,000 — 5,458,000 194,242,000 Municipal 54,217,000 53,179,000 — — 53,179,000 Residential Term 472,941,000 463,150,000 — 625,000 462,525,000 Construction 18,415,000 18,034,000 — — 18,034,000 Home equity line of credit 94,957,000 92,834,000 — 14,000 92,820,000 Consumer 23,787,000 22,124,000 — — 22,124,000 Total loans 1,253,149,000 1,229,685,000 — 6,519,000 1,223,166,000 Mortgage servicing rights 1,356,000 2,410,000 — 2,410,000 — Financial liabilities Local certificates of deposit $ 293,980,000 $ 293,325,000 $ — $ 293,325,000 $ — National certificates of deposit 418,496,000 419,285,000 — 419,285,000 — Total certificates of deposits 712,476,000 712,610,000 — 712,610,000 — Repurchase agreements 30,309,000 30,276,000 — 30,276,000 — Federal Home Loan Bank advances 140,110,000 139,565,000 — 139,565,000 — Total borrowed funds 170,419,000 169,841,000 — 169,841,000 — The carrying amounts and estimated fair values for financial instruments as of December 31, 2018 were as follows: Carrying value Estimated fair value Level 1 Level 2 Level 3 Financial assets Securities to be held to maturity $ 255,663,000 $ 250,900,000 $ — $ 250,900,000 $ — Loans (net of allowance for loan losses) Commercial Real estate 349,243,000 340,526,000 — 423,000 340,103,000 Construction 27,018,000 26,344,000 — — 26,344,000 Other 192,420,000 189,842,000 — 6,096,000 183,746,000 Municipal 51,101,000 50,965,000 — — 50,965,000 Residential Term 467,760,000 451,323,000 — 793,000 450,530,000 Construction 17,705,000 17,083,000 — — 17,083,000 Home equity line of credit 97,650,000 95,175,000 — 103,000 95,072,000 Consumer 24,154,000 22,530,000 — — 22,530,000 Total loans 1,227,051,000 1,193,788,000 — 7,415,000 1,186,373,000 Mortgage servicing rights 1,354,000 2,586,000 — 2,586,000 — Financial liabilities Local certificates of deposit $ 284,482,000 $ 281,282,000 $ — $ 281,282,000 $ — National certificates of deposit 306,927,000 307,508,000 — 307,508,000 — Total deposits 591,409,000 588,790,000 — 588,790,000 — Repurchase agreements 40,205,000 40,161,000 — 40,161,000 — Federal Home Loan Bank advances 170,112,000 169,240,000 — 169,240,000 — Total borrowed funds 210,317,000 209,401,000 — 209,401,000 — The carrying amount and estimated fair values for financial instruments as of March 31, 2018 were as follows: Carrying value Estimated fair value Level 1 Level 2 Level 3 Financial assets Securities to be held to maturity $ 258,690,000 $ 255,851,000 $ — $ 255,851,000 $ — Loans (net of allowance for loan losses) Commercial Real estate 335,275,000 326,030,000 — 3,000 326,027,000 Construction 43,385,000 42,189,000 — — 42,189,000 Other 173,960,000 171,045,000 — 5,495,000 165,550,000 Municipal 35,440,000 34,972,000 — — 34,972,000 Residential Term 438,765,000 430,023,000 — 334,000 429,689,000 Construction 15,814,000 15,587,000 — 15,587,000 Home equity line of credit 109,525,000 108,047,000 — 106,000 107,941,000 Consumer 24,881,000 24,178,000 — — 24,178,000 Total loans 1,177,045,000 1,152,071,000 — 5,938,000 1,146,133,000 Mortgage servicing rights 1,280,000 2,518,000 — 2,518,000 — Financial liabilities Local certificates of deposit 260,450,000 255,579,000 — 255,579,000 — National certificates of deposit 374,297,000 374,095,000 — 374,095,000 — Total certificates of deposits 634,747,000 629,674,000 — 629,674,000 — Repurchase agreements 67,182,000 64,361,000 — 64,361,000 — Federal Home Loan Bank advances 177,047,000 175,308,000 — 175,308,000 — Total borrowed funds 244,229,000 239,669,000 — 239,669,000 —

Investment Securities - Amortiz

Investment Securities - Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 327,224	$ 323,809	$ 308,700
Unrealized Gains	1,414	578	194
Unrealized Losses	(3,362)	(6,971)	(8,055)
Fair Value (Estimated)	325,276	317,416	300,839
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,000	5,000
Unrealized Gains	16	7
Unrealized Losses	0	0
Fair Value (Estimated)	5,016	5,007
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	317,269	313,854	302,935
Unrealized Gains	1,394	571	191
Unrealized Losses	(3,240)	(6,732)	(7,798)
Fair Value (Estimated)	315,423	307,693	295,328
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,955	4,955	5,765
Unrealized Gains	4	0	3
Unrealized Losses	(122)	(239)	(257)
Fair Value (Estimated)	$ 4,837	$ 4,716	$ 5,511

Investment Securities - Amort_2

Investment Securities - Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 281,219	$ 255,663	$ 258,690
Unrealized Gains	3,582	1,382	1,966
Unrealized Losses	(2,233)	(6,145)	(4,805)
Fair Value (Estimated)	282,568	250,900	255,851
U.S. Government-sponsored agencies
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	31,155	11,155	11,155
Unrealized Gains	48	0	0
Unrealized Losses	(280)	(472)	(515)
Fair Value (Estimated)	30,923	10,683	10,640
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	17,560	18,250	21,990
Unrealized Gains	372	336	469
Unrealized Losses	(146)	(255)	(289)
Fair Value (Estimated)	17,786	18,331	22,170
State and political subdivisions
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	225,204	221,958	221,245
Unrealized Gains	3,162	1,046	1,497
Unrealized Losses	(1,801)	(5,418)	(4,001)
Fair Value (Estimated)	226,565	217,586	218,741
Corporate securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	7,300	4,300	4,300
Unrealized Gains	0	0	0
Unrealized Losses	(6)	0	0
Fair Value (Estimated)	$ 7,294	$ 4,300	$ 4,300

Investment Securities - Amort_3

Investment Securities - Amortized Cost and Estimated Fair Value of Restricted Equity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Federal Home Loan Bank Stock	$ 7,945	$ 10,549	$ 10,910
Federal Reserve Bank Stock	1,037	1,037	1,037
Restricted equity securities	$ 8,982	$ 11,586	$ 11,947

Investment Securities - Contrac

Investment Securities - Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract]
Due in 1 year or less, Securities available for sale, Amortized Cost	$ 0	$ 0	$ 61
Due in 1 to 5 years, Securities available for sale, Amortized Cost	15,670	13,501	6,502
Due in 5 to 10 years, Securities available for sale, Amortized Cost	107,978	83,954	66,434
Due after 10 years, Securities available for sale, Amortized Cost	203,576	226,354	235,703
Amortized Cost	327,224	323,809	308,700
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Due in 1 year or less, Securities available for sale, Fair Value (Estimated)	0	0	61
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated)	15,736	13,518	6,492
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated)	108,698	83,326	65,234
Due after 10 years, Securities available for sale, Fair Value (Estimated)	200,842	220,572	229,052
Securities available for sale, Fair Value (Estimated)	325,276	317,416	300,839
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Due in 1 year or less, Securities to be held to maturity, Amortized Cost	1,429	1,432	634
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost	21,096	20,717	25,692
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost	176,967	157,544	145,297
Due after 10 years, Securities to be held to maturity, Amortized Cost	81,727	75,970	87,067
Securities to be held to maturity, Amortized Cost	281,219	255,663	258,690
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Due in 1 year or less, Securities to be held to maturity, Fair Value (Estimated)	1,431	1,433	635
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated)	21,203	20,778	25,796
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated)	178,044	155,313	144,211
Due after 10 years, Securities to be held to maturity, Fair Value (Estimated)	81,890	73,376	85,209
Securities to be held to maturity, Fair Value (Estimated)	$ 282,568	$ 250,900	$ 255,851

Investment Securities - Additio

Investment Securities - Additional Information (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019USD ($)securitystate	Mar. 31, 2018USD ($)security	Dec. 31, 2018USD ($)security	Sep. 30, 2014USD ($)
Investment [Line Items]
Number of securities temporarily impaired (security) | security	291	457	511
Number of securities temporarily impaired for twelve months or more (security) | security	274	159	232
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	$ 194	$ 182	$ 197
Number of states in New England where FHLB serve (state) | state	6
Federal Home Loan Bank Stock	$ 7,945	10,910	10,549
Other equity securities
Investment [Line Items]
Fair value of securities pledged as collateral	$ 189,711	$ 197,349	$ 222,829
State and political subdivisions
Investment [Line Items]
Percentage of overall security holdings downgraded	0.40%

Investment Securities - Gains a

Investment Securities - Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales of securities	$ 0	$ 459
Gross realized gains	0	136
Gross realized losses	0	0
Net gain	0	136
Related income taxes	$ 0	$ 29

Investment Securities - Tempora

Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	$ 28,783	$ 152,859	$ 254,875
Unrealized Losses (Less than 12 months)	(147)	(2,845)	(6,174)
Fair Value (Estimated) (12 months or more)	267,315	240,871	141,888
Unrealized Losses (12 months or more)	(5,448)	(10,271)	(6,686)
Fair Value (Estimated)	296,098	393,730	396,763
Unrealized Losses	(5,595)	(13,116)	(12,860)
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	0	0	6,946
Unrealized Losses (Less than 12 months)	0	0	(309)
Fair Value (Estimated) (12 months or more)	10,875	10,683	3,694
Unrealized Losses (12 months or more)	(280)	(472)	(206)
Fair Value (Estimated)	10,875	10,683	10,640
Unrealized Losses	(280)	(472)	(515)
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	24,525	76,050	183,335
Unrealized Losses (Less than 12 months)	(138)	(1,061)	(4,332)
Fair Value (Estimated) (12 months or more)	198,272	185,136	101,012
Unrealized Losses (12 months or more)	(3,248)	(5,926)	(3,755)
Fair Value (Estimated)	222,797	261,186	284,347
Unrealized Losses	(3,386)	(6,987)	(8,087)
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	1,264	76,809	64,594
Unrealized Losses (Less than 12 months)	(3)	(1,784)	(1,533)
Fair Value (Estimated) (12 months or more)	58,168	45,052	37,182
Unrealized Losses (12 months or more)	(1,920)	(3,873)	(2,725)
Fair Value (Estimated)	59,432	121,861	101,776
Unrealized Losses	(1,923)	$ (5,657)	$ (4,258)
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Fair Value (Estimated) (Less than 12 months)	2,994
Unrealized Losses (Less than 12 months)	(6)
Fair Value (Estimated) (12 months or more)	0
Unrealized Losses (12 months or more)	0
Fair Value (Estimated)	2,994
Unrealized Losses	$ (6)

Loans - Loan Portfolio (Details

Loans - Loan Portfolio (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Schedule of Financing Receivables [Line Items]
Loans	$ 1,264,639	$ 1,238,283	$ 1,188,002
Percentage of loans receivable, by type	100.00%	100.00%	100.00%
Commercial | Real estate
Schedule of Financing Receivables [Line Items]
Loans	$ 357,760	$ 353,243	$ 339,306
Percentage of loans receivable, by type	28.30%	28.50%	28.60%
Commercial | Construction
Schedule of Financing Receivables [Line Items]
Loans	$ 34,231	$ 27,304	$ 43,813
Percentage of loans receivable, by type	2.70%	2.20%	3.70%
Commercial | Other
Schedule of Financing Receivables [Line Items]
Loans	$ 205,462	$ 196,391	$ 177,783
Percentage of loans receivable, by type	16.20%	15.90%	15.00%
Municipal
Schedule of Financing Receivables [Line Items]
Loans	$ 54,246	$ 51,128	$ 35,463
Percentage of loans receivable, by type	4.30%	4.10%	3.00%
Residential | Construction
Schedule of Financing Receivables [Line Items]
Loans	$ 18,450	$ 17,743	$ 15,847
Percentage of loans receivable, by type	1.50%	1.40%	1.30%
Residential | Term
Schedule of Financing Receivables [Line Items]
Loans	$ 474,241	$ 469,145	$ 439,984
Percentage of loans receivable, by type	37.50%	37.90%	37.00%
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Loans	$ 95,692	$ 98,469	$ 110,298
Percentage of loans receivable, by type	7.60%	8.00%	9.30%
Consumer
Schedule of Financing Receivables [Line Items]
Loans	$ 24,557	$ 24,860	$ 25,508
Percentage of loans receivable, by type	1.90%	2.00%	2.10%

Loans - Narrative (Details)

Loans - Narrative (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019USD ($)loan	Mar. 31, 2018USD ($)loan	Dec. 31, 2018USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net deferred loan costs	$ 6,878	$ 5,990	$ 6,615
Qualifying first mortgage loans	321,290	237,239	290,138
Loans pledged as collateral	$ 251,591	$ 255,020	$ 237,152
Loans classified as TDR (loan) | loan	80	69	76
Value of loans classified as TDR	$ 25,386	$ 18,709	$ 25,222
Number of Loans | loan	10	7
Value of TDR loans more than 30 days past due	$ 1,129	$ 810
Number of TDR loans more than 30 days past due (loan) | loan	3	0
Number of loans placed on TDR status (loan) | loan	5	7
Number of TDR loans involved in bankruptcy (loan) | loan	7
Value of TDR loans involved in bankruptcy	$ 929
Number of TDR loans on non-accrual status (loan) | loan	20
Value of TDR loans on non-accrual status	$ 8,555
Number of TDR loans in the process of foreclosure (loan) | loan	3
Loans classified as TDRs in process of foreclosure	$ 398
Number of mortgage loans in the process of foreclosure (loan) | loan	10	13
Value of mortgage loans in the process of foreclosure	$ 1,101	$ 1,388
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	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Schedule of Financing Receivables [Line Items]
All Past Due	$ 11,280	$ 13,375	$ 15,867
Current	1,253,359	1,224,908	1,172,135
Total	1,264,639	1,238,283	1,188,002
90 Days or More & Accruing	4	351	137
30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	6,048	5,958	11,940
60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	2,215	3,977	860
90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	3,017	3,440	3,067
Commercial | Real estate
Schedule of Financing Receivables [Line Items]
All Past Due	1,728	2,051	1,182
Current	356,032	351,192	338,124
Total	357,760	353,243	339,306
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	282	1,274	963
Commercial | Real estate | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	825	0	17
Commercial | Real estate | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	621	777	202
Commercial | Construction
Schedule of Financing Receivables [Line Items]
All Past Due	333	10	347
Current	33,898	27,294	43,466
Total	34,231	27,304	43,813
90 Days or More & Accruing	0	0	0
Commercial | Construction | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	47	0	347
Commercial | Construction | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	0	10	0
Commercial | Construction | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	286	0	0
Commercial | Other
Schedule of Financing Receivables [Line Items]
All Past Due	1,030	580	7,233
Current	204,432	195,811	170,550
Total	205,462	196,391	177,783
90 Days or More & Accruing	0	0	0
Commercial | Other | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	664	455	6,887
Commercial | Other | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	63	5	52
Commercial | Other | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	303	120	294
Municipal
Schedule of Financing Receivables [Line Items]
All Past Due	0	0	0
Current	54,246	51,128	35,463
Total	54,246	51,128	35,463
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	76	0
Current	18,450	17,667	15,847
Total	18,450	17,743	15,847
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	76	0
Residential | Construction | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	0	0	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	5,246	6,638	5,400
Current	468,995	462,507	434,584
Total	474,241	469,145	439,984
90 Days or More & Accruing	0	339	0
Residential | Term | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	2,659	1,097	3,175
Residential | Term | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	1,153	3,518	345
Residential | Term | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	1,434	2,023	1,880
Home equity line of credit
Schedule of Financing Receivables [Line Items]
All Past Due	2,365	3,731	1,551
Current	93,327	94,738	108,747
Total	95,692	98,469	110,298
90 Days or More & Accruing	0	0	126
Home equity line of credit | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	1,985	2,819	449
Home equity line of credit | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	11	419	438
Home equity line of credit | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	369	493	664
Consumer
Schedule of Financing Receivables [Line Items]
All Past Due	578	289	154
Current	23,979	24,571	25,354
Total	24,557	24,860	25,508
90 Days or More & Accruing	4	12	11
Consumer | 30-59 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	411	237	119
Consumer | 60-89 Days Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	163	25	8
Consumer | 90 Days or More Past Due
Schedule of Financing Receivables [Line Items]
All Past Due	$ 4	$ 27	$ 27

Loans - Nonaccrual Loans (Detai

Loans - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 13,736	$ 14,727	$ 14,283
Commercial | Real estate
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	1,468	1,226	1,021
Commercial | Construction
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	286	0	0
Commercial | Other
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	7,067	8,664	8,895
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	4,211	4,062	3,654
Home equity line of credit
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	702	760	697
Consumer
Schedule of Financing Receivables [Line Items]
Nonaccrual loans	$ 2	$ 15	$ 16

Loans - Impaired Loans by Class

Loans - Impaired Loans by Class (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	$ 20,042	$ 18,603	$ 21,030
Recorded investment, with related allowance	10,526	13,112	10,721
Recorded Investment	30,568	31,715	31,751
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	21,936	20,140	22,831
Unpaid principal balance with related allowance	11,056	13,597	11,397
Unpaid Principal Balance	32,992	33,737	34,228
Related Allowance	2,075	2,206	2,308
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	20,748	18,012	18,776
Average recorded investment, with related allowance	10,601	13,109	13,029
Average Recorded Investment	31,349	31,121	31,805
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	181	146	764
Recognized interest income, with related allowance	43	63	100
Recognized Interest Income	224	209	864
Commercial | Real estate
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	8,391	5,054	8,718
Recorded investment, with related allowance	1,566	3,897	1,042
Recorded Investment	9,957	8,951	9,760
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	8,779	5,269	9,161
Unpaid principal balance with related allowance	1,583	4,002	1,059
Unpaid Principal Balance	10,362	9,271	10,220
Related Allowance	233	254	260
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	8,741	4,163	5,536
Average recorded investment, with related allowance	1,215	3,889	3,477
Average Recorded Investment	9,956	8,052	9,013
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	90	54	380
Recognized interest income, with related allowance	26	39	42
Recognized Interest Income	116	93	422
Commercial | Construction
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	1,007	741	721
Recorded investment, with related allowance	0	0	0
Recorded Investment	1,007	741	721
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	1,007	741	721
Unpaid principal balance with related allowance	0	0	0
Unpaid Principal Balance	1,007	741	721
Related Allowance	0	0	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	817	741	762
Average recorded investment, with related allowance	0	0	0
Average Recorded Investment	817	741	762
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	12	10	43
Recognized interest income, with related allowance	0	0	0
Recognized Interest Income	12	10	43
Commercial | Other
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	709	2,281	1,468
Recorded investment, with related allowance	6,944	7,159	7,791
Recorded Investment	7,653	9,440	9,259
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	734	2,360	1,555
Unpaid principal balance with related allowance	7,315	7,324	8,216
Unpaid Principal Balance	8,049	9,684	9,771
Related Allowance	1,485	1,664	1,696
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	1,207	2,302	2,037
Average recorded investment, with related allowance	7,511	7,182	7,471
Average Recorded Investment	8,718	9,484	9,508
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	6	6	32
Recognized interest income, with related allowance	0	0	5
Recognized Interest Income	6	6	37
Municipal
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	0	0	0
Recorded investment, with related allowance	0	0	0
Recorded Investment	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	0	0	0
Unpaid principal balance with related allowance	0	0	0
Unpaid Principal Balance	0	0	0
Related Allowance	0	0	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	0	0	0
Average recorded investment, with related allowance	0	0	0
Average Recorded Investment	0	0	0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	0	0	0
Recognized interest income, with related allowance	0	0	0
Recognized Interest Income	0	0	0
Residential | Construction
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	0	0	0
Recorded investment, with related allowance	0	0	0
Recorded Investment	0	0	0
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	0	0	0
Unpaid principal balance with related allowance	0	0	0
Unpaid Principal Balance	0	0	0
Related Allowance	0	0	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	0	0	0
Average recorded investment, with related allowance	0	0	0
Average Recorded Investment	0	0	0
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	0	0	0
Recognized interest income, with related allowance	0	0	0
Recognized Interest Income	0	0	0
Residential | Term
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	8,926	9,594	9,136
Recorded investment, with related allowance	1,993	1,934	1,768
Recorded Investment	10,919	11,528	10,904
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	10,345	10,733	10,317
Unpaid principal balance with related allowance	2,131	2,146	1,998
Unpaid Principal Balance	12,476	12,879	12,315
Related Allowance	348	272	335
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	9,007	9,700	9,427
Average recorded investment, with related allowance	1,845	1,968	1,982
Average Recorded Investment	10,852	11,668	11,409
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	68	71	289
Recognized interest income, with related allowance	17	24	53
Recognized Interest Income	85	95	342
Home equity line of credit
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	1,009	917	972
Recorded investment, with related allowance	21	122	120
Recorded Investment	1,030	1,039	1,092
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	1,071	1,008	1,035
Unpaid principal balance with related allowance	25	125	124
Unpaid Principal Balance	1,096	1,133	1,159
Related Allowance	7	16	17
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	976	1,090	1,001
Average recorded investment, with related allowance	29	70	99
Average Recorded Investment	1,005	1,160	1,100
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	5	5	20
Recognized interest income, with related allowance	0	0	0
Recognized Interest Income	5	5	20
Consumer
Impaired Financing Receivable, Recorded Investment [Abstract]
Recorded investment, with no related allowance	0	16	15
Recorded investment, with related allowance	2	0	0
Recorded Investment	2	16	15
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Unpaid principal balance, with no related allowance	0	29	42
Unpaid principal balance with related allowance	2	0	0
Unpaid Principal Balance	2	29	42
Related Allowance	2	0	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Average recorded investment, with no related allowance	0	16	13
Average recorded investment, with related allowance	1	0	0
Average Recorded Investment	1	16	13
Impaired Financing Receivable, Interest Income, Cash Basis Method [Abstract]
Recognized interest income, with no related allowance	0	0	0
Recognized interest income, with related allowance	0	0	0
Recognized Interest Income	$ 0	$ 0	$ 0

Loans - TDR's by Class and Spec

Loans - TDR's by Class and Specific Reserves (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019USD ($)loan	Mar. 31, 2018USD ($)loan	Dec. 31, 2018USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	80	69	76
Balance	$ 25,386	$ 18,709	$ 25,222
Specific Reserves	$ 1,607	$ 403	$ 1,568
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	17	15	17
Balance	$ 8,583	$ 8,030	$ 8,631
Specific Reserves	$ 107	$ 132	$ 132
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	1	1	1
Balance	$ 721	$ 741	$ 721
Specific Reserves	$ 0	$ 0	$ 0
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	10	4	10
Balance	$ 7,257	$ 546	$ 7,298
Specific Reserves	$ 1,275	$ 0	$ 1,276
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	49	46	45
Balance	$ 8,331	$ 8,883	$ 8,074
Specific Reserves	$ 225	$ 271	$ 160
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	3	3	3
Balance	$ 494	$ 509	$ 498
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 Sp_2

Loans - TDR's by Class and Specific Reserves More Than 30 Days Past Due (Details) $ in Thousands	Mar. 31, 2019USD ($)loan	Mar. 31, 2018USD ($)loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable Modifications Number Of Contracts Greater Than 30 Days Past Due Place In TDR In Previous 12 Months | loan	3	0
Number of Loans | loan	10	7
Balance	$ 1,129	$ 810
Specific Reserves	$ 170	$ 45
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	4	0
Balance	$ 261	$ 0
Specific Reserves	$ 134	$ 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	5	6
Balance	$ 701	$ 643
Specific Reserves	$ 36	$ 45
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
	Mar. 31, 2019USD ($)loan	Mar. 31, 2018USD ($)loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	5	7
Pre-Modification Outstanding Recorded Investment	$ 573	$ 1,056
Post-Modification Outstanding Recorded Investment	554	1,056
Specific Reserves	$ 74	$ 36
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	$ 36
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	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	0	0
Specific Reserves	$ 0	$ 0
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	5	0
Pre-Modification Outstanding Recorded Investment	$ 573	$ 0
Post-Modification Outstanding Recorded Investment	554	0
Specific Reserves	$ 74	$ 0
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	3 Months Ended	12 Months Ended
	Mar. 31, 2019USD ($)loan_class	Dec. 31, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of classes in the loan portfolio | loan_class	8
Allowance for loan and lease losses (as a percentage)	0.46%	0.45%
Allowance for loan and lease losses, period increase (decrease)	$ 193
Allowance for loan losses	$ 11,490	$ 11,232	$ 10,957	$ 10,729
Allowance for loan losses as a percent of total loans	0.91%		0.92%
Number of classes in the commercial loan portfolio | loan_class	3
Number of classes in the residential loan portfolio | loan_class	2
Residential loans typical loan to value range (as a percentage)	80.00%
Construction loans accrual to company capital	29.40%
Constructions loan portfolio maximum to company capital	100.00%
Construction and non owner occupied commercial real estate	128.40%
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	$ 660	630	$ 581	545
Delinquent period before consumer loans charged off (days)	120 days
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan-to-value ratio	0.80
Amortization term of residential loans	30 years
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
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 630	730	716	692
Loan-to-value ratio	0.80
Loan maturities	300 months
Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 1,644	$ 1,216	811
Total reserve allowance accounted for by loan loss allowances (percent)	14.30%	10.80%
Construction | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 30	$ 34	$ 31	$ 36
Loan maturities	1 year
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential loans typical loan to value range (as a percentage)	75.00%
Collateralized consumer loans to individuals loan to value maximum range (as a percentage)	80.00%
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential loans typical loan to value range (as a percentage)	80.00%
Collateralized consumer loans to individuals loan to value maximum range (as a percentage)	90.00%

Allowance for Loan Losses - Fin

Allowance for Loan Losses - Financing Receivable and Allowance Element by Class (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 11,490	$ 11,232	$ 10,957	$ 10,729
Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,075	2,308	2,206
General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,955	2,085	2,593
Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	5,816	5,623	5,347
Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,644	1,216	811
Commercial | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,632	3,567	3,732	3,872
Commercial | Real estate | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	233	260	254
Commercial | Real estate | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	790	742	1,039
Commercial | Real estate | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2,609	2,565	2,439
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	325	255	396	434
Commercial | Construction | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0	0	0
Commercial | Construction | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	76	57	81
Commercial | Construction | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	249	198	315
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	3,430	3,541	3,540	3,358
Commercial | Other | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,485	1,696	1,664
Commercial | Other | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	452	414	597
Commercial | Other | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,493	1,431	1,279
Municipal
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	25	24	21	20
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	25	24	21
Residential | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	30	34	31	36
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	7	12	11
Residential | Construction | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	23	22	20
Residential | Term
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,114	1,235	1,129	1,130
Residential | Term | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	348	335	272
Residential | Term | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	182	326	303
Residential | Term | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	584	574	554
Home equity line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	630	730	716	692
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	7	17	16
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	158	263	297
Home equity line of credit | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	465	450	403
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	660	630	581	545
Consumer | Specific Reserves on Loans Evaluated Individually for Impairment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	2	0	0
Consumer | General Reserves on Loans Based on Historical Loss Experience
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	290	271	265
Consumer | Reserves for Qualitative Factors
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	368	359	316
Unallocated
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	1,644	1,216	811	$ 642
Unallocated | Unallocated Reserves
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 1,644	$ 1,216	$ 811

Allowance for Loan Losses - Ris

Allowance for Loan Losses - Risk Ratings by Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	$ 651,699	$ 628,066	$ 596,365
1 Strong
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	3,673	3,444	1,251
2 Above Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	66,386	63,885	51,751
3 Satisfactory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	129,360	129,105	118,779
4 Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	294,329	275,268	285,946
5 Watch
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	122,412	117,841	100,073
6 OAEM
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	4,840	8,695	5,014
7 Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	30,576	29,705	33,428
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	357,760	353,243	339,306
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	34,231	27,304	43,813
Commercial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	205,462	196,391	177,783
Commercial | 1 Strong | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	0	0	0
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	3,630	3,444	1,251
Commercial | 2 Above Average | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	10,097	10,484	12,308
Commercial | 2 Above Average | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	36	37	40
Commercial | 2 Above Average | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	4,447	4,564	5,528
Commercial | 3 Satisfactory | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	82,595	80,266	74,612
Commercial | 3 Satisfactory | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	2,352	2,231	4,776
Commercial | 3 Satisfactory | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	43,963	46,090	38,738
Commercial | 4 Average | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	179,290	172,597	183,675
Commercial | 4 Average | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	23,267	18,780	21,585
Commercial | 4 Average | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	89,825	82,081	79,751
Commercial | 5 Watch | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	63,503	66,325	46,918
Commercial | 5 Watch | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	8,290	5,970	17,412
Commercial | 5 Watch | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	50,619	45,546	35,743
Commercial | 6 OAEM | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	2,847	6,890	3,148
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	1,993	1,805	1,866
Commercial | 7 Substandard | Real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	19,305	16,558	18,522
Commercial | 7 Substandard | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	286	286	0
Commercial | 7 Substandard | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	10,985	12,861	14,906
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	54,246	51,128	35,463
Municipal | 1 Strong
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	43	0	0
Municipal | 2 Above Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	51,806	48,800	33,875
Municipal | 3 Satisfactory
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	450	518	653
Municipal | 4 Average
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial and municipal risk-rated loans receivable	1,947	1,810	935
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		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 11,232	$ 10,729	$ 10,729
Charge offs	151	318	1,273
Recoveries	34	46	276
Provision for loan losses	375	500	1,500
Ending balance	11,490	10,957	11,232
Ending balance specifically evaluated for impairment	2,075	2,206	2,308
Ending balance collectively evaluated for impairment	9,415	8,751	8,924
Total	1,264,639	1,188,002	1,238,283
Ending balance specifically evaluated for impairment	30,568	31,715	31,751
Ending balance collectively evaluated for impairment	1,234,071	1,156,287	1,206,532
Commercial | Real estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,567	3,872	3,872
Charge offs	0	0	168
Recoveries	8	0	52
Provision for loan losses	57	(140)	(189)
Ending balance	3,632	3,732	3,567
Ending balance specifically evaluated for impairment	233	254	260
Ending balance collectively evaluated for impairment	3,399	3,478	3,307
Total	357,760	339,306	353,243
Ending balance specifically evaluated for impairment	9,957	8,951	9,760
Ending balance collectively evaluated for impairment	347,803	330,355	343,483
Commercial | Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	255	434	434
Charge offs	0	0	0
Recoveries	0	0	0
Provision for loan losses	70	(38)	(179)
Ending balance	325	396	255
Ending balance specifically evaluated for impairment	0	0	0
Ending balance collectively evaluated for impairment	325	396	255
Total	34,231	43,813	27,304
Ending balance specifically evaluated for impairment	1,007	741	721
Ending balance collectively evaluated for impairment	33,224	43,072	26,583
Commercial | Other
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,541	3,358	3,358
Charge offs	1	17	423
Recoveries	1	6	40
Provision for loan losses	(111)	193	566
Ending balance	3,430	3,540	3,541
Ending balance specifically evaluated for impairment	1,485	1,664	1,696
Ending balance collectively evaluated for impairment	1,945	1,876	1,845
Total	205,462	177,783	196,391
Ending balance specifically evaluated for impairment	7,653	9,440	9,259
Ending balance collectively evaluated for impairment	197,809	168,343	187,132
Municipal
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	24	20	20
Charge offs	0	0	0
Recoveries	0	0	0
Provision for loan losses	1	1	4
Ending balance	25	21	24
Ending balance specifically evaluated for impairment	0	0	0
Ending balance collectively evaluated for impairment	25	21	24
Total	54,246	35,463	51,128
Ending balance specifically evaluated for impairment	0	0	0
Ending balance collectively evaluated for impairment	54,246	35,463	51,128
Residential | Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	34	36	36
Charge offs	0	0	0
Recoveries	0	0	0
Provision for loan losses	(4)	(5)	(2)
Ending balance	30	31	34
Ending balance specifically evaluated for impairment	0	0	0
Ending balance collectively evaluated for impairment	30	31	34
Total	18,450	15,847	17,743
Ending balance specifically evaluated for impairment	0	0	0
Ending balance collectively evaluated for impairment	18,450	15,847	17,743
Residential | Term
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,235	1,130	1,130
Charge offs	49	81	213
Recoveries	3	4	64
Provision for loan losses	(75)	76	254
Ending balance	1,114	1,129	1,235
Ending balance specifically evaluated for impairment	348	272	335
Ending balance collectively evaluated for impairment	766	857	900
Total	474,241	439,984	469,145
Ending balance specifically evaluated for impairment	10,919	11,528	10,904
Ending balance collectively evaluated for impairment	463,322	428,456	458,241
Home equity line of credit
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	730	692	692
Charge offs	38	115	121
Recoveries	1	11	24
Provision for loan losses	(63)	128	135
Ending balance	630	716	730
Ending balance specifically evaluated for impairment	7	16	17
Ending balance collectively evaluated for impairment	623	700	713
Total	95,692	110,298	98,469
Ending balance specifically evaluated for impairment	1,030	1,039	1,092
Ending balance collectively evaluated for impairment	94,662	109,259	97,377
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	630	545	545
Charge offs	63	105	348
Recoveries	21	25	96
Provision for loan losses	72	116	337
Ending balance	660	581	630
Ending balance specifically evaluated for impairment	2	0	0
Ending balance collectively evaluated for impairment	658	581	630
Total	24,557	25,508	24,860
Ending balance specifically evaluated for impairment	2	16	15
Ending balance collectively evaluated for impairment	24,555	25,492	24,845
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,216	642	642
Charge offs	0	0	0
Recoveries	0	0	0
Provision for loan losses	428	169	574
Ending balance	1,644	811	1,216
Ending balance specifically evaluated for impairment	0	0	0
Ending balance collectively evaluated for impairment	1,644	811	1,216
Total	0	0	0
Ending balance specifically evaluated for impairment	0	0	0
Ending balance collectively evaluated for impairment	$ 0	$ 0	$ 0

Stock-Based Compensation - Narr

Stock-Based Compensation - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total share based compensation cost	$ 1,797	$ 1,797
Compensation expense recognized		123	$ 95
Share-based compensation expense not yet recognized	$ 1,046	$ 1,046	$ 964
Plan 2010
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)	163,192
Shares	75,804	75,804

Stock-Based Compensation - Shar

Stock-Based Compensation - Shares of Restricted Stock Granted under 2010 Plan (Details) - Plan 2010 - Restricted Stock - shares	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares	75,804
Remaining Term (In Years)	2 years 1 month 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)					27 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)				1 year 9 months 18 days
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)			2 years 9 months 18 days
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)			27 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)		3 years 9 months 18 days
2018 | Three Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)		3 years
Shares	2,150
Remaining Term (In Years)		1 year 10 months 24 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)		24 days
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)		2 years 9 months 18 days
2019 | Three Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)	3 years
Shares	16,254
Remaining Term (In Years)	2 years 9 months 18 days
2019 | One Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)	1 year
Shares	1,349
Remaining Term (In Years)	24 days
2019 | Two Years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Term (In Years)	2 years
Shares	1,484
Remaining Term (In Years)	1 year 9 months 18 days

Preferred and Common Stock (Det

Preferred and Common Stock (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Class of Stock [Line Items]
Proceeds from sale of common stock	$ 168	$ 157
Capital Purchase Program
Class of Stock [Line Items]
Proceeds from sale of common stock	$ 168	$ 157

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
	Mar. 31, 2019	Mar. 31, 2018
Income (Numerator) [Abstract]
Net income as reported	$ 6,156	$ 5,506
Basic EPS: Income available to common shareholders	6,156	5,506
Diluted EPS: Income available to common shareholders plus assumed conversions	$ 6,156	$ 5,506
Shares (Denominator) [Abstract]
Basic EPS: Income available to common shareholders (in shares)	10,802,782	10,771,271
Effect of dilutive securities: restricted stock (in shares)	73,953	73,228
Diluted EPS: Income available to common shareholders plus assumed conversions (in shares)	10,876,735	10,844,499
Per-Share Amount [Abstract]
Basic EPS: Income available to common shareholders (in dollars per share)	$ 0.57	$ 0.51
Diluted EPS: Income available to common shareholders plus assumed conversions (in dollars per share)	$ 0.57	$ 0.51

Employee Benefit Plans - Narrat

Employee Benefit Plans - Narrative (Details)	3 Months Ended
	Mar. 31, 2019USD ($)employeepost_retirement_benefit_plan	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)
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	$ 185,000	$ 164,000
Unfunded, supplemental retirement benefits payable period (years)	20 years
Pension expense	$ 40,000	43,000
Accrued pension liability	$ 2,894,000	$ 3,031,000	$ 2,949,000
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	$ 113,000
Estimated plan expense	66,000
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
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Change in benefit obligation
Benefit obligation at beginning of year	$ (1,599)	$ (1,874)
Interest cost	17	19
Benefits paid	(28)	(28)
Benefit obligation at end of period	(1,588)	(1,865)
Funded status
Benefit obligation at end of period	(1,599)	(1,874)	$ (1,588)	$ (1,865)
Unamortized (gain) loss			(47)	186
Accrued benefit cost at end of period			$ (1,635)	$ (1,679)
Components of net periodic benefit cost
Interest cost	17	19
Net periodic benefit cost	$ 17	$ 19

Employee Benefit Plans - Schedu

Employee Benefit Plans - Schedule of Net Periodic Benefit Cost Not Yet Recognized (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Retirement Benefits, Description [Abstract]
Unamortized net actuarial gain (loss)	$ 47	$ (186)	$ 47
Deferred tax (benefit) expense	(10)	39	(10)
Net unrecognized postretirement benefits included in accumulated other comprehensive income (loss)	$ 37	$ (147)	$ 37
Deferred tax benefit, percentage	21.00%	21.00%	21.00%

Other Comprehensive Income (L_3

Other Comprehensive Income (Loss) - Summary of Available for Sale Securities Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 191,542	$ 181,321
Other comprehensive income (loss)	3,050	(2,933)
Ending balance	197,787	181,372
Accumulated Net Investment Gain (Loss) Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(5,051)	(2,901)
Unrealized gains (losses) arising during the period	4,446	(4,052)
Reclassification of realized gains during the period	0	(136)
Related deferred taxes	(934)	879
Other comprehensive income (loss)	3,512	(3,309)
Ending balance	$ (1,539)	$ (6,210)

Other Comprehensive Income (L_4

Other Comprehensive Income (Loss) - Reclassification of Available-for-Sale Securities to Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reclassification of Available-for-Sale Securities to Held-to-maturity Roll Forward [Roll Forward]
Beginning balance	$ 191,542	$ 181,321
Other comprehensive income (loss)	3,050	(2,933)
Ending balance	197,787	181,372
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	(197)	(174)
Amortization of net unrealized gains (losses)	4	(10)
Related deferred taxes	(1)	2
Other comprehensive income (loss)	3	(8)
Ending balance	$ (194)	$ (182)

Other Comprehensive Income (L_5

Other Comprehensive Income (Loss) - Derivative Instruments Included in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 191,542	$ 181,321
Other comprehensive income (loss)	3,050	(2,933)
Ending balance	197,787	181,372
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	1,438	1,544
Unrealized gains (losses) arising during the period	(589)	486
Related deferred taxes	124	(102)
Other comprehensive income (loss)	(465)	384
Ending balance	$ 973	$ 1,928

Other Comprehensive Income (L_6

Other Comprehensive Income (Loss) - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	$ 191,542	$ 181,321
Ending balance	197,787	181,372
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Roll Forward]
Beginning balance	37	(147)
Amortization of unrecognized transition obligation	0	0
Change in unamortized net actuarial gain (loss)	0	0
Related deferred taxes	0	0
Ending balance	$ 37	$ (147)

Financial Derivative Instrume_3

Financial Derivative Instruments (Details) - Cash Flow Hedging - Designated as Hedging Instrument - USD ($)	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Interest Rate Swap June 28 2021
Derivative [Line Items]
Notional Amount	$ 30,000,000
Fixed Rate Paid	0.94%
Fair Value	$ 847,000	$ 1,110,000	$ 1,447,000
Interest Rate Swap June 27 2021
Derivative [Line Items]
Notional Amount	$ 20,000,000
Fixed Rate Paid	0.893%
Fair Value	$ 586,000	763,000	994,000
Interest Rate Swap December 5 2019
Derivative [Line Items]
Notional Amount	$ 25,000,000
Fixed Rate Paid	2.466%
Fair Value	$ (7,000)	16,000	0
Interest Rate Swap June 5 2020
Derivative [Line Items]
Notional Amount	$ 25,000,000
Fixed Rate Paid	2.547%
Fair Value	$ (57,000)	(9,000)	0
Interest Rate Swap December 5 2020
Derivative [Line Items]
Notional Amount	$ 25,000,000
Fixed Rate Paid	2.603%
Fair Value	$ (137,000)	(60,000)	0
Interest Rate Swap
Derivative [Line Items]
Notional Amount	125,000,000
Fair Value	$ 1,232,000	$ 1,820,000	$ 2,441,000

Mortgage Servicing Rights - Nar

Mortgage Servicing Rights - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Transfers and Servicing [Abstract]
Moving average of weekly prepayment assumption (months)	3 years
Prepayment speed (as a percentage)	9.18%
Discount rate adjustment rate (as a percentage)	9.50%
Servicing rights capitalized	$ 58	$ 62
Servicing rights amortized	56	50
Mortgage servicing rights	2,410	2,518	$ 2,586
Residential mortgage loans serviced for others, principal	$ 260,553	$ 258,475	$ 261,654

Mortgage Servicing Rights - Sch

Mortgage Servicing Rights - Schedule of Mortgage Servicing Rights (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Transfers and Servicing [Abstract]
Mortgage servicing rights	$ 5,776	$ 5,718	$ 5,489
Accumulated amortization	(4,420)	(4,364)	(4,209)
Impairment reserve	0	0	0
Total servicing asset at fair value	$ 1,356	$ 1,354	$ 1,280

Certificates of Deposit (Detail

Certificates of Deposit (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Banking and Thrift [Abstract]
Certificates of deposit of less than $100,000	$ 398,689	$ 372,464	$ 347,010
Certificates $100,000 to $250,000	238,429	162,185	240,492
Certificates $250,000 and over	75,358	56,760	47,245
Total certificates of deposit	$ 712,476	$ 591,409	$ 634,747

Fair Value - Assets Recorded at

Fair Value - Assets Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 325,276	$ 317,416	$ 300,839
Securities available for sale			300,839
U.S. Government-sponsored agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	5,016	5,007
Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	315,423	307,693	295,328
State and political subdivisions
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	4,837	4,716	5,511
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
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 | U.S. Government-sponsored agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	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
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
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	325,276	317,416
Securities available for sale			300,839
Total assets	326,508	319,236	303,280
Fair Value, Measurements, Recurring | Level 2 | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	1,232	1,820	2,441
Fair Value, Measurements, Recurring | Level 2 | U.S. Government-sponsored agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	5,016	5,007
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	315,423	307,693
Securities available for sale			295,328
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	4,837	4,716
Securities available for sale			5,511
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
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 | U.S. Government-sponsored agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	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
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
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	325,276	317,416
Securities available for sale			300,839
Total assets	326,508	319,236	303,280
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	1,232	1,820	2,441
Fair Value, Measurements, Recurring | Total Fair Value | U.S. Government-sponsored agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	5,016	5,007
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	315,423	307,693
Securities available for sale			295,328
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	$ 4,837	$ 4,716
Securities available for sale			$ 5,511

Fair Value - Additional Informa

Fair Value - Additional Information (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Valuation allowance on real estate owned		$ 0	$ 0
Valuation allowance on impaired financing receivable	$ 1,822,000	$ 2,096,000	$ 1,924,000

Fair Value - Assets Recorded _2

Fair Value - Assets Recorded at Fair Value on a Non-Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned	$ 584	$ 584	$ 1,121
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	584	584	1,121
Impaired loans	6,519	7,415	5,938
Total assets	7,103	7,999	7,059
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	584	584	1,121
Impaired loans	6,519	7,415	5,938
Total assets	$ 7,103	$ 7,999	$ 7,059

Fair Value - Assets and Liabili

Fair Value - Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities to be held to maturity, carrying value	$ 281,219	$ 255,663	$ 258,690
Securities to be held to maturity	282,568	250,900	255,851
Mortgage servicing rights	2,410	2,586	2,518
Total certificates of deposits	1,606,875	1,527,085	1,428,192
Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities to be held to maturity, carrying value	281,219	255,663	258,690
Loans	1,253,149	1,227,051	1,177,045
Mortgage servicing rights, carrying value	1,356	1,354	1,280
Local certificates of deposit	293,980	284,482	260,450
National certificates of deposit	418,496	306,927	374,297
Total certificates of deposits	712,476	591,409	634,747
Repurchase agreements	30,309	40,205	67,182
Federal Home Loan Bank advances	140,110	170,112	177,047
Total borrowed funds	170,419	210,317	244,229
Carrying value | Commercial | Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	353,521	349,243	335,275
Carrying value | Commercial | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	33,852	27,018	43,385
Carrying value | Commercial | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	201,459	192,420	173,960
Carrying value | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	54,217	51,101	35,440
Carrying value | Residential | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	18,415	17,705	15,814
Carrying value | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	472,941	467,760	438,765
Carrying value | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	94,957	97,650	109,525
Carrying value | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	23,787	24,154	24,881
Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities to be held to maturity	282,568	250,900	255,851
Loans	1,229,685	1,193,788	1,152,071
Mortgage servicing rights	2,410	2,586	2,518
Local certificates of deposit	293,325	281,282	255,579
National certificates of deposit	419,285	307,508	374,095
Total certificates of deposits	712,610	588,790	629,674
Repurchase agreements	30,276	40,161	64,361
Federal Home Loan Bank advances	139,565	169,240	175,308
Total borrowed funds	169,841	209,401	239,669
Total Fair Value | Commercial | Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	347,398	340,526	326,030
Total Fair Value | Commercial | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	33,266	26,344	42,189
Total Fair Value | Commercial | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	199,700	189,842	171,045
Total Fair Value | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	53,179	50,965	34,972
Total Fair Value | Residential | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	18,034	17,083	15,587
Total Fair Value | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	463,150	451,323	430,023
Total Fair Value | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	92,834	95,175	108,047
Total Fair Value | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	22,124	22,530	24,178
Total Fair Value | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities to be held to maturity	0	0	0
Loans	0	0	0
Mortgage servicing rights	0	0	0
Local certificates of deposit	0	0	0
National certificates of deposit	0	0	0
Total certificates of deposits	0	0	0
Repurchase agreements	0	0	0
Federal Home Loan Bank advances	0	0	0
Total borrowed funds	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]
Securities to be held to maturity	282,568	250,900	255,851
Loans	6,519	7,415	5,938
Mortgage servicing rights	2,410	2,586	2,518
Local certificates of deposit	293,325	281,282	255,579
National certificates of deposit	419,285	307,508	374,095
Total certificates of deposits	712,610	588,790	629,674
Repurchase agreements	30,276	40,161	64,361
Federal Home Loan Bank advances	139,565	169,240	175,308
Total borrowed funds	169,841	209,401	239,669
Total Fair Value | Level 2 | Commercial | Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	422	423	3
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	5,458	6,096	5,495
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
Total Fair Value | Level 2 | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	625	793	334
Total Fair Value | Level 2 | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	14	103	106
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]
Securities to be held to maturity	0	0	0
Loans	1,223,166	1,186,373	1,146,133
Mortgage servicing rights	0	0	0
Local certificates of deposit	0	0	0
National certificates of deposit	0	0	0
Total certificates of deposits	0	0	0
Repurchase agreements	0	0	0
Federal Home Loan Bank advances	0	0	0
Total borrowed funds	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	346,976	340,103	326,027
Total Fair Value | Level 3 | Commercial | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	33,266	26,344	42,189
Total Fair Value | Level 3 | Commercial | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	194,242	183,746	165,550
Total Fair Value | Level 3 | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	53,179	50,965	34,972
Total Fair Value | Level 3 | Residential | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	18,034	17,083	15,587
Total Fair Value | Level 3 | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	462,525	450,530	429,689
Total Fair Value | Level 3 | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	92,820	95,072	107,941
Total Fair Value | Level 3 | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 22,124	$ 22,530	$ 24,178

Impact of Recently Issued Acc_2

Impact of Recently Issued Accounting Standards (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)
Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification adjustment for effect of enacted tax law changes	$ 297