Fair Value (Details 3) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financial Assets, Carrying Value:
Cash and cash equivalents, Carrying Value	$ 113,693	$ 99,003	$ 79,769	$ 112,936
Investment securities, Carrying Value	261,298	251,176
Federal Home Loan Bank Stock, Carrying Value	15,992	13,798
Loans, net, including loans held for sale, Carrying Value	2,332,465	1,924,210
Accrued interest receivable, Carrying Value	8,706	6,760
Financial Liabilities, Carrying Value:
Deposits, Carrying Value	2,437,656	1,981,628
Advances from Federal Home Loan Bank, Carrying Value	84,279	103,943
Securities sold under repurchase agreements, Carrying Value	26,019	31,816
Subordinated debentures, Carrying Value	36,083	36,083
Financial Assets, Fair Value:
Cash and cash equivalents, Fair Value	113,693	99,003
Investment securities, Fair Value	261,299	251,179
Loans, net, including loans held for sale, Fair Value	2,315,791	1,911,280
Accrued interest receivable, Fair Value	8,706	6,760
Financial Liabilities, Fair Value:
Deposits, Fair Value	2,444,683	1,987,723
Advances from Federal Home Loan Bank, Fair Value	83,261	103,019
Securities sold under repurchase agreements, Fair Value	26,019	31,816
Subordinated debentures, Fair Value	35,385	34,718
Fair Value, Inputs, Level 1 [Member]
Financial Assets, Fair Value:
Cash and cash equivalents, Fair Value	113,693	99,003
Investment securities, Fair Value	1	2
Loans, net, including loans held for sale, Fair Value	0	0
Accrued interest receivable, Fair Value	13	9
Financial Liabilities, Fair Value:
Deposits, Fair Value	571,360	487,663
Advances from Federal Home Loan Bank, Fair Value	0	0
Securities sold under repurchase agreements, Fair Value	0	0
Subordinated debentures, Fair Value	0	0
Fair Value, Inputs, Level 2 [Member]
Financial Assets, Fair Value:
Cash and cash equivalents, Fair Value	0	0
Investment securities, Fair Value	261,298	251,177
Loans, net, including loans held for sale, Fair Value	10,830	9,917
Accrued interest receivable, Fair Value	917	867
Financial Liabilities, Fair Value:
Deposits, Fair Value	1,873,323	1,500,060
Advances from Federal Home Loan Bank, Fair Value	83,261	103,019
Securities sold under repurchase agreements, Fair Value	26,019	31,816
Subordinated debentures, Fair Value	0	0
Fair Value, Inputs, Level 3 [Member]
Financial Assets, Fair Value:
Cash and cash equivalents, Fair Value	0	0
Investment securities, Fair Value	0	0
Loans, net, including loans held for sale, Fair Value	2,304,961	1,901,363
Accrued interest receivable, Fair Value	7,776	5,884
Financial Liabilities, Fair Value:
Deposits, Fair Value	0	0
Advances from Federal Home Loan Bank, Fair Value	0	0
Securities sold under repurchase agreements, Fair Value	0	0
Subordinated debentures, Fair Value	$ 35,385	$ 34,718