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Fair Value Disclosures - Carrying Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017
Financial assets
Securities to be held to maturity, fair value	$ 250,900				$ 259,655
Loans (net of allowance for loan losses)
Mortgage servicing rights	2,586				2,321
Financial liabilities
Certificates of deposit	591,409				559,001
Total deposits	1,527,085	$ 1,514,911	$ 1,416,646	$ 1,428,192	1,418,879	$ 1,350,049	$ 1,319,259	$ 1,346,483
Level 1
Financial assets
Securities to be held to maturity, fair value	0				0
Loans (net of allowance for loan losses)
Loans	0				0
Mortgage servicing rights	0				0
Financial liabilities
Certificates of deposit	0				0
National certificates of deposit	0				0
Total deposits	0				0
Repurchase agreements	0				0
Federal Home Loan Bank advances	0				0
Total borrowed funds	0				0
Level 1 | Commercial | Real Estate
Loans (net of allowance for loan losses)
Loans	0				0
Level 1 | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	0				0
Level 1 | Commercial | Other
Loans (net of allowance for loan losses)
Loans	0				0
Level 1 | Municipal
Loans (net of allowance for loan losses)
Loans	0				0
Level 1 | Residential | Construction
Loans (net of allowance for loan losses)
Loans	0				0
Level 1 | Residential | Term
Loans (net of allowance for loan losses)
Loans	0				0
Level 1 | Home Equity LIne of Credit
Loans (net of allowance for loan losses)
Loans	0				0
Level 1 | Consumer
Loans (net of allowance for loan losses)
Loans	0				0
Level 2
Financial assets
Securities to be held to maturity, fair value	250,900				259,655
Loans (net of allowance for loan losses)
Loans	7,415				6,521
Mortgage servicing rights	2,586				2,321
Financial liabilities
Certificates of deposit	281,282				220,734
National certificates of deposit	307,508				335,775
Total deposits	588,790				556,509
Repurchase agreements	40,161				67,976
Federal Home Loan Bank advances	169,240				156,396
Total borrowed funds	209,401				224,372
Level 2 | Commercial | Real Estate
Loans (net of allowance for loan losses)
Loans	423				72
Level 2 | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	0				0
Level 2 | Commercial | Other
Loans (net of allowance for loan losses)
Loans	6,096				6,018
Level 2 | Municipal
Loans (net of allowance for loan losses)
Loans	0				0
Level 2 | Residential | Construction
Loans (net of allowance for loan losses)
Loans	0				0
Level 2 | Residential | Term
Loans (net of allowance for loan losses)
Loans	793				391
Level 2 | Home Equity LIne of Credit
Loans (net of allowance for loan losses)
Loans	103				40
Level 2 | Consumer
Loans (net of allowance for loan losses)
Loans	0				0
Level 3
Financial assets
Securities to be held to maturity, fair value	0				0
Loans (net of allowance for loan losses)
Loans	1,186,373				1,132,206
Mortgage servicing rights	0				0
Financial liabilities
Certificates of deposit	0				0
National certificates of deposit	0				0
Total deposits	0				0
Repurchase agreements	0				0
Federal Home Loan Bank advances	0				0
Total borrowed funds	0				0
Level 3 | Commercial | Real Estate
Loans (net of allowance for loan losses)
Loans	340,103				311,249
Level 3 | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	26,344				36,610
Level 3 | Commercial | Other
Loans (net of allowance for loan losses)
Loans	183,746				169,437
Level 3 | Municipal
Loans (net of allowance for loan losses)
Loans	50,965				33,280
Level 3 | Residential | Construction
Loans (net of allowance for loan losses)
Loans	17,083				17,613
Level 3 | Residential | Term
Loans (net of allowance for loan losses)
Loans	450,530				430,637
Level 3 | Home Equity LIne of Credit
Loans (net of allowance for loan losses)
Loans	95,072				108,972
Level 3 | Consumer
Loans (net of allowance for loan losses)
Loans	22,530				24,408
Carrying Amount
Financial assets
Securities to be held to maturity, fair value	255,663				256,567
Loans (net of allowance for loan losses)
Loans	1,227,051				1,153,410
Mortgage servicing rights	1,354				1,268
Financial liabilities
Certificates of deposit	284,482				223,074
National certificates of deposit	306,927				335,927
Total deposits	591,409				559,001
Repurchase agreements	40,205				70,564
Federal Home Loan Bank advances	170,112				158,194
Total borrowed funds	210,317				228,758
Carrying Amount | Commercial | Real Estate
Loans (net of allowance for loan losses)
Loans	349,243				319,691
Carrying Amount | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	27,018				37,594
Carrying Amount | Commercial | Other
Loans (net of allowance for loan losses)
Loans	192,420				177,956
Carrying Amount | Municipal
Loans (net of allowance for loan losses)
Loans	51,101				33,370
Carrying Amount | Residential | Construction
Loans (net of allowance for loan losses)
Loans	17,705				17,830
Carrying Amount | Residential | Term
Loans (net of allowance for loan losses)
Loans	467,760				431,459
Carrying Amount | Home Equity LIne of Credit
Loans (net of allowance for loan losses)
Loans	97,650				110,566
Carrying Amount | Consumer
Loans (net of allowance for loan losses)
Loans	24,154				24,944
Estimate of Fair Value
Financial assets
Securities to be held to maturity, fair value	250,900				259,655
Loans (net of allowance for loan losses)
Loans	1,193,788				1,138,727
Mortgage servicing rights	2,586				2,321
Financial liabilities
Certificates of deposit	281,282				220,734
National certificates of deposit	307,508				335,775
Total deposits	588,790				556,509
Repurchase agreements	40,161				67,976
Federal Home Loan Bank advances	169,240				156,396
Total borrowed funds	209,401				224,372
Estimate of Fair Value | Commercial | Real Estate
Loans (net of allowance for loan losses)
Loans	340,526				311,321
Estimate of Fair Value | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	26,344				36,610
Estimate of Fair Value | Commercial | Other
Loans (net of allowance for loan losses)
Loans	189,842				175,455
Estimate of Fair Value | Municipal
Loans (net of allowance for loan losses)
Loans	50,965				33,280
Estimate of Fair Value | Residential | Construction
Loans (net of allowance for loan losses)
Loans	17,083				17,613
Estimate of Fair Value | Residential | Term
Loans (net of allowance for loan losses)
Loans	451,323				431,028
Estimate of Fair Value | Home Equity LIne of Credit
Loans (net of allowance for loan losses)
Loans	95,175				109,012
Estimate of Fair Value | Consumer
Loans (net of allowance for loan losses)
Loans	$ 22,530				$ 24,408

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