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Fair Value Disclosures - Carrying Amounts and Estimated Fair Values (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016
Financial assets
Securities available for sale	$ 300,172				$ 300,416
Securities to be held to maturity, fair value	259,655				225,537
Restricted equity securities, at cost	10,358				11,930
Loans (net of allowance for loan losses)
Mortgage servicing rights	2,321				1,696
Financial liabilities
Demand deposits	181,970				140,482
NOW deposits	281,405				282,971
Money market deposits	163,898				125,544
Savings deposits	232,605				217,340
Certificates of deposit	559,001				476,620
Total deposits	1,418,879	$ 1,350,049	$ 1,319,259	$ 1,346,483	1,242,957	$ 1,173,749	$ 1,145,709	$ 1,109,441
Level 1
Financial assets
Cash and cash equivalents	19,207				17,366
Interest-bearing deposits in other banks	860				293
Securities available for sale	0				0
Securities to be held to maturity, fair value	0				0
Restricted equity securities, at cost	0				0
Loans held for sale	0				0
Loans (net of allowance for loan losses)
Loans	0				0
Mortgage servicing rights	0				0
Interest rate swap agreements	0				0
Accrued interest receivable	0				0
Financial liabilities
Demand deposits	0				0
NOW deposits	0				0
Money market deposits	0				0
Savings deposits	0				0
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
Accrued interest payable	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
Cash and cash equivalents	0				0
Interest-bearing deposits in other banks	0				0
Securities available for sale	300,172				300,416
Securities to be held to maturity, fair value	259,655				225,537
Restricted equity securities, at cost	10,358				11,930
Loans held for sale	386				782
Loans (net of allowance for loan losses)
Loans	6,521				827
Mortgage servicing rights	2,321				1,696
Interest rate swap agreements	1,955				1,790
Accrued interest receivable	5,867				5,532
Financial liabilities
Demand deposits	174,481				133,342
NOW deposits	261,702				259,418
Money market deposits	153,497				115,087
Savings deposits	203,799				188,260
Certificates of deposit	220,734				209,370
National certificates of deposit	335,775				266,372
Total deposits	1,349,988				1,171,849
Repurchase agreements	67,976				79,827
Federal Home Loan Bank advances	156,396				193,733
Total borrowed funds	224,372				273,560
Accrued interest payable	642				479
Level 2 | Commercial | Real Estate
Loans (net of allowance for loan losses)
Loans	72				558
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	6,018				33
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	391				236
Level 2 | Home Equity LIne of Credit
Loans (net of allowance for loan losses)
Loans	40				0
Level 2 | Consumer
Loans (net of allowance for loan losses)
Loans	0				0
Level 3
Financial assets
Cash and cash equivalents	0				0
Interest-bearing deposits in other banks	0				0
Securities available for sale	0				0
Securities to be held to maturity, fair value	0				0
Restricted equity securities, at cost	0				0
Loans held for sale	0				0
Loans (net of allowance for loan losses)
Loans	1,132,206				1,052,987
Mortgage servicing rights	0				0
Interest rate swap agreements	0				0
Accrued interest receivable	0				0
Financial liabilities
Demand deposits	0				0
NOW deposits	0				0
Money market deposits	0				0
Savings deposits	0				0
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
Accrued interest payable	0				0
Level 3 | Commercial | Real Estate
Loans (net of allowance for loan losses)
Loans	311,249				292,545
Level 3 | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	36,610				24,548
Level 3 | Commercial | Other
Loans (net of allowance for loan losses)
Loans	169,437				147,361
Level 3 | Municipal
Loans (net of allowance for loan losses)
Loans	33,280				27,446
Level 3 | Residential | Construction
Loans (net of allowance for loan losses)
Loans	17,613				18,125
Level 3 | Residential | Term
Loans (net of allowance for loan losses)
Loans	430,637				410,091
Level 3 | Home Equity LIne of Credit
Loans (net of allowance for loan losses)
Loans	108,972				108,740
Level 3 | Consumer
Loans (net of allowance for loan losses)
Loans	24,408				24,131
Carrying Amount
Financial assets
Cash and cash equivalents	19,207				17,366
Interest-bearing deposits in other banks	860				293
Securities available for sale	300,172				300,416
Securities to be held to maturity, fair value	256,567				226,828
Restricted equity securities, at cost	10,358				11,930
Loans held for sale	386				782
Loans (net of allowance for loan losses)
Loans	1,153,410				1,061,388
Mortgage servicing rights	1,268				1,113
Interest rate swap agreements	1,955				1,790
Accrued interest receivable	5,867				5,532
Financial liabilities
Demand deposits	181,970				140,482
NOW deposits	281,405				282,971
Money market deposits	163,898				125,544
Savings deposits	232,605				217,340
Certificates of deposit	223,074				210,316
National certificates of deposit	335,927				266,304
Total deposits	1,418,879				1,242,957
Repurchase agreements	70,564				84,174
Federal Home Loan Bank advances	158,194				194,727
Total borrowed funds	228,758				278,901
Accrued interest payable	642				479
Carrying Amount | Commercial | Real Estate
Loans (net of allowance for loan losses)
Loans	319,691				297,952
Carrying Amount | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	37,594				24,954
Carrying Amount | Commercial | Other
Loans (net of allowance for loan losses)
Loans	177,956				148,737
Carrying Amount | Municipal
Loans (net of allowance for loan losses)
Loans	33,370				27,035
Carrying Amount | Residential | Construction
Loans (net of allowance for loan losses)
Loans	17,830				18,253
Carrying Amount | Residential | Term
Loans (net of allowance for loan losses)
Loans	431,459				409,999
Carrying Amount | Home Equity LIne of Credit
Loans (net of allowance for loan losses)
Loans	110,566				109,986
Carrying Amount | Consumer
Loans (net of allowance for loan losses)
Loans	24,944				24,472
Estimate of Fair Value
Financial assets
Cash and cash equivalents	19,207				17,366
Interest-bearing deposits in other banks	860				293
Securities available for sale	300,172				300,416
Securities to be held to maturity, fair value	259,655				225,537
Restricted equity securities, at cost	10,358				11,930
Loans held for sale	386				782
Loans (net of allowance for loan losses)
Loans	1,138,727				1,053,814
Mortgage servicing rights	2,321				1,696
Interest rate swap agreements	1,955				1,790
Accrued interest receivable	5,867				5,532
Financial liabilities
Demand deposits	174,481				133,342
NOW deposits	261,702				259,418
Money market deposits	153,497				115,087
Savings deposits	203,799				188,260
Certificates of deposit	220,734				209,370
National certificates of deposit	335,775				266,372
Total deposits	1,349,988				1,171,849
Repurchase agreements	67,976				79,827
Federal Home Loan Bank advances	156,396				193,733
Total borrowed funds	224,372				273,560
Accrued interest payable	642				479
Estimate of Fair Value | Commercial | Real Estate
Loans (net of allowance for loan losses)
Loans	311,321				293,103
Estimate of Fair Value | Commercial | Construction
Loans (net of allowance for loan losses)
Loans	36,610				24,548
Estimate of Fair Value | Commercial | Other
Loans (net of allowance for loan losses)
Loans	175,455				147,394
Estimate of Fair Value | Municipal
Loans (net of allowance for loan losses)
Loans	33,280				27,446
Estimate of Fair Value | Residential | Construction
Loans (net of allowance for loan losses)
Loans	17,613				18,125
Estimate of Fair Value | Residential | Term
Loans (net of allowance for loan losses)
Loans	431,028				410,327
Estimate of Fair Value | Home Equity LIne of Credit
Loans (net of allowance for loan losses)
Loans	109,012				108,740
Estimate of Fair Value | Consumer
Loans (net of allowance for loan losses)
Loans	$ 24,408				$ 24,131

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Represents the portion of the balance sheet assertion valued at fair value whether such amount is presented as a separate caption or as a parenthetical disclosure. Element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. May be used in both the balance sheet and disclosure in the same submission. This item represents the amount shown on an entity's books for accrued interest receivable.

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No definition available.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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