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Fair Value Disclosures - Carrying Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Financial assets
Securities to be held to maturity, fair value	$ 377,134				$ 287,045
Loans (net of allowance for loan losses)
Mortgage servicing rights	1,985				2,089
Financial liabilities
Certificates of deposit	605,585				689,979
Total deposits	1,844,611	$ 1,763,059	$ 1,740,121	$ 1,644,612	1,650,466	$ 1,623,290	$ 1,592,956	$ 1,606,875
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
Other borrowed funds	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	377,134				287,045
Loans (net of allowance for loan losses)
Loans	794				6,579
Mortgage servicing rights	1,985				2,089
Financial liabilities
Certificates of deposit	253,892				281,480
National certificates of deposit	359,899				412,337
Total deposits	613,791				693,817
Repurchase agreements	69,497				37,450
Other borrowed funds	194,469				140,063
Total borrowed funds	263,966				177,513
Level 2 | Commercial | Real estate
Loans (net of allowance for loan losses)
Loans	347				2
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	5				5,046
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	442				577
Level 2 | Home equity line of credit
Loans (net of allowance for loan losses)
Loans	0				954
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	1,475,898				1,269,106
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
Other borrowed funds	0				0
Total borrowed funds	0				0
Level 3 | Commercial | Real estate
Loans (net of allowance for loan losses)
Loans	440,388				364,624
Level 3 | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	56,388				37,366
Level 3 | Commercial | Other
Loans (net of allowance for loan losses)
Loans	279,496				207,502
Level 3 | Municipal
Loans (net of allowance for loan losses)
Loans	44,440				40,552
Level 3 | Residential | Construction
Loans (net of allowance for loan losses)
Loans	21,890				14,786
Level 3 | Residential | Term
Loans (net of allowance for loan losses)
Loans	532,617				490,782
Level 3 | Home equity line of credit
Loans (net of allowance for loan losses)
Loans	77,177				90,005
Level 3 | Consumer
Loans (net of allowance for loan losses)
Loans	23,502				23,489
Carrying Amount
Financial assets
Securities to be held to maturity, fair value	365,613				281,606
Loans (net of allowance for loan losses)
Loans	1,460,508				1,285,436
Mortgage servicing rights	1,956				1,546
Financial liabilities
Certificates of deposit	250,264				285,602
National certificates of deposit	355,321				404,377
Total deposits	605,585				689,979
Repurchase agreements	69,340				37,450
Other borrowed funds	192,698				147,505
Total borrowed funds	262,038				184,955
Carrying Amount | Commercial | Real estate
Loans (net of allowance for loan losses)
Loans	436,161				368,645
Carrying Amount | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	55,803				37,678
Carrying Amount | Commercial | Other
Loans (net of allowance for loan losses)
Loans	281,057				215,068
Carrying Amount | Municipal
Loans (net of allowance for loan losses)
Loans	43,586				41,258
Carrying Amount | Residential | Construction
Loans (net of allowance for loan losses)
Loans	21,483				14,785
Carrying Amount | Residential | Term
Loans (net of allowance for loan losses)
Loans	519,101				491,315
Carrying Amount | Home equity line of credit
Loans (net of allowance for loan losses)
Loans	78,356				91,149
Carrying Amount | Consumer
Loans (net of allowance for loan losses)
Loans	24,961				25,538
Estimate of Fair Value
Financial assets
Securities to be held to maturity, fair value	377,134				287,045
Loans (net of allowance for loan losses)
Loans	1,476,692				1,275,685
Mortgage servicing rights	1,985				2,089
Financial liabilities
Certificates of deposit	253,892				281,480
National certificates of deposit	359,899				412,337
Total deposits	613,791				693,817
Repurchase agreements	69,497				37,450
Other borrowed funds	194,469				140,063
Total borrowed funds	263,966				177,513
Estimate of Fair Value | Commercial | Real estate
Loans (net of allowance for loan losses)
Loans	440,735				364,626
Estimate of Fair Value | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	56,388				37,366
Estimate of Fair Value | Commercial | Other
Loans (net of allowance for loan losses)
Loans	279,501				212,548
Estimate of Fair Value | Municipal
Loans (net of allowance for loan losses)
Loans	44,440				40,552
Estimate of Fair Value | Residential | Construction
Loans (net of allowance for loan losses)
Loans	21,890				14,786
Estimate of Fair Value | Residential | Term
Loans (net of allowance for loan losses)
Loans	533,059				491,359
Estimate of Fair Value | Home equity line of credit
Loans (net of allowance for loan losses)
Loans	77,177				90,959
Estimate of Fair Value | Consumer
Loans (net of allowance for loan losses)
Loans	$ 23,502				$ 23,489

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