Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Activities
Net income	$ 13,241,000	$ 12,262,000	$ 11,046,000
Items not requiring cash
Provision for loan losses	850,000	125,000	850,000
Depreciation and amortization	5,006,000	4,546,000	4,113,000
Deferred income tax	1,537,000	1,926,000	1,087,000
Increase in cash value of life insurance	(346,000)	(204,000)
Loans originated for sale	(150,620,000)	(145,749,000)	(67,295,000)
Proceeds from sales of loans held for sale	156,827,000	149,613,000	64,614,000
Gain on sale of loans held for sale	(4,761,000)	(4,176,000)	(1,849,000)
Net gain on sale of securities, available for sale	(1,023,000)	(436,000)	(313,000)
Loss on sale of other real estate and repossessed assets	210,000	111,000	53,000
Change in
Interest receivable and other assets	(1,349,000)	(1,321,000)	(386,000)
Interest payable and other liabilities	(5,000)	277,000	774,000
Cash value of life insurance	(1,159,000)	(1,184,000)	(1,158,000)
Other adjustments	143,000	143,000	474,000
Net cash provided by operating activities	18,551,000	15,933,000	12,010,000
Investing Activities
Net change in interest-bearing time deposits	(993,000)
Purchases of securities
Purchases of securities, available for sale	(88,161,000)	(67,414,000)	(48,001,000)
Proceeds from maturities and paydowns of securities
Available for sale	37,872,000	41,824,000	31,709,000
Proceeds from sales of securities, available for sale	57,037,000	23,109,000	28,317,000
Redemption of Federal Home Loan Bank stock		2,154,000	2,427,000
Purchase of Federal Home Loan Bank stock	(443,000)	(672,000)
Net change in loans	(92,946,000)	(67,561,000)	(41,611,000)
Purchases of premises and equipment	(2,079,000)	(2,413,000)	(1,306,000)
Cash paid in acquisition, net			(900,000)
Proceeds from real estate owned sales	2,497,000	2,260,000	7,605,000
Proceeds from bank owned life insurance benefit	1,120,000	1,181,000
Proceeds from sale of premises and equipment	9,490,000
Net cash used in investing activities	(76,606,000)	(67,532,000)	(21,760,000)
Net change in
Noninterest-bearing, interest-bearing demand and savings deposits	39,883,000	62,642,000	36,828,000
Certificates of deposit	22,117,000	(50,580,000)	(70,593,000)
Proceeds from FHLB advances	316,300,000	355,700,000	493,700,000
Repayments of FHLB advances	(301,326,000)	(322,525,000)	(444,186,000)
Repayments of other borrowings	(5,312,000)	(759,000)	(759,000)
Cash dividends	(4,284,000)	(3,550,000)	(2,297,000)
Stock options exercised	976,000	2,011,000	1,347,000
Stock repurchased	(4,354,000)
Net cash provided by financing activities	64,000,000	42,939,000	14,040,000
Net Change in Cash and Cash Equivalents	5,945,000	(8,660,000)	4,290,000
Cash and Cash Equivalents, Beginning of Period	20,915,000	29,575,000	25,285,000
Cash and Cash Equivalents, End of Period	26,860,000	20,915,000	29,575,000
Additional Cash Flows Information
Interest paid	9,096,000	8,827,000	8,857,000
Income tax paid	2,650,000	2,850,000	2,500,000
Transfers from loans to foreclosed real estate	1,450,000	1,301,000	2,129,000
Mortgage servicing rights capitalized	482,000	460,000	$ 278,000
Transfer from fixed assets to other assets	$ 763,000	$ 702,000