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Fair Value - Assets and Liabilities at Fair Value (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities to be held to maturity, carrying value	$ 302,527,000	$ 255,663,000	$ 260,077,000
Securities to be held to maturity	308,075,000	250,900,000	256,316,000
Mortgage servicing rights	2,087,000	2,586,000	2,581,000
Total certificates of deposits	1,592,956,000	1,527,085,000	1,416,646,000
Carrying value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities to be held to maturity, carrying value	302,527,000	255,663,000	260,077,000
Loans	1,237,661,000	1,227,051,000	1,212,968,000
Mortgage servicing rights, carrying value	1,368,000	1,354,000	1,285,000
Local certificates of deposit	281,903,000	284,482,000	267,932,000
National certificates of deposit	435,095,000	306,927,000	389,459,000
Total certificates of deposits	716,998,000	591,409,000	657,391,000
Repurchase agreements	40,954,000	40,205,000	91,764,000
Federal Home Loan Bank advances	140,904,000	170,112,000	205,691,000
Total borrowed funds	181,858,000	210,317,000	297,455,000
Carrying value | Commercial | Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	355,285,000	349,243,000	345,853,000
Carrying value | Commercial | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	32,417,000	27,018,000	39,852,000
Carrying value | Commercial | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	202,004,000	192,420,000	180,750,000
Carrying value | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	36,083,000	51,101,000	48,693,000
Carrying value | Residential | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	13,212,000	17,705,000	14,550,000
Carrying value | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	480,032,000	467,760,000	452,289,000
Carrying value | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	94,009,000	97,650,000	106,892,000
Carrying value | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	24,619,000	24,154,000	24,089,000
Total Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities to be held to maturity	308,075,000	250,900,000	256,316,000
Loans	1,223,815,000	1,193,788,000	1,188,573,000
Mortgage servicing rights	2,087,000	2,586,000	2,581,000
Local certificates of deposit	283,746,000	281,282,000	263,342,000
National certificates of deposit	436,682,000	307,508,000	389,062,000
Total certificates of deposits	720,428,000	588,790,000	652,404,000
Repurchase agreements	40,912,000	40,161,000	88,560,000
Federal Home Loan Bank advances	139,880,000	169,240,000	204,476,000
Total borrowed funds	180,792,000	209,401,000	293,036,000
Total Fair Value | Commercial | Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	350,390,000	340,526,000	338,784,000
Total Fair Value | Commercial | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	31,970,000	26,344,000	39,037,000
Total Fair Value | Commercial | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	200,804,000	189,842,000	178,904,000
Total Fair Value | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	35,825,000	50,965,000	47,790,000
Total Fair Value | Residential | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	13,089,000	17,083,000	14,443,000
Total Fair Value | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	475,560,000	451,323,000	441,029,000
Total Fair Value | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	93,260,000	95,175,000	105,264,000
Total Fair Value | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	22,917,000	22,530,000	23,322,000
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	308,075,000	250,900,000	256,316,000
Loans	6,693,000	7,415,000	6,387,000
Mortgage servicing rights	2,087,000	2,586,000	2,581,000
Local certificates of deposit	283,746,000	281,282,000	263,342,000
National certificates of deposit	436,682,000	307,508,000	389,062,000
Total certificates of deposits	720,428,000	588,790,000	652,404,000
Repurchase agreements	40,912,000	40,161,000	88,560,000
Federal Home Loan Bank advances	139,880,000	169,240,000	204,476,000
Total borrowed funds	180,792,000	209,401,000	293,036,000
Total Fair Value | Level 2 | Commercial | Real estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	622,000	423,000	423,000
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	5,315,000	6,096,000	5,527,000
Total Fair Value | Level 2 | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 2 | Residential | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0	0
Total Fair Value | Level 2 | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	745,000	793,000	339,000
Total Fair Value | Level 2 | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	11,000	103,000	98,000
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	1,217,122,000	1,186,373,000	1,182,186,000
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	349,768,000	340,103,000	338,361,000
Total Fair Value | Level 3 | Commercial | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	31,970,000	26,344,000	39,037,000
Total Fair Value | Level 3 | Commercial | Other
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	195,489,000	183,746,000	173,377,000
Total Fair Value | Level 3 | Municipal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	35,825,000	50,965,000	47,790,000
Total Fair Value | Level 3 | Residential | Construction
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	13,089,000	17,083,000	14,443,000
Total Fair Value | Level 3 | Residential | Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	474,815,000	450,530,000	440,690,000
Total Fair Value | Level 3 | Home equity line of credit
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	93,249,000	95,072,000	105,166,000
Total Fair Value | Level 3 | Consumer
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 22,917,000	$ 22,530,000	$ 23,322,000

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Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets.

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Amount of short-term and long-term debt and lease obligation.

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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Amount of investment in debt security measured at amortized cost (held-to-maturity).

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Amortized amount of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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