Fair Value of Financial Instruments, Assets, Balance Sheet Grouping (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Assets [Abstract]
AFS Securities - U.S. government agency notes	$ 12,011		$ 10,119
HTM securities	49,026		54,004
Liabilities [Abstract]
Assets transfers level 1 to level 2 Transfers	0	$ 0	0
Liabilities transfers level 1 to level 2 Transfers	0	0	0
Assets transfers level 2 to level 1 Transfers	0	0	0
Liabilities transfers level 2 to level 1 Transfers	0	0	0
Assets transfers into level 3	0	0	0
Liabilities transfers into level 3	0	0	0
Assets transfers out of level 3	0	0	0
Liabilities transfers out of level 3	0	$ 0	0
Bank Commitments [Member]
Liabilities [Abstract]
Loan funding commitments	84,200		105,200
Standby Letters of Credit [Member]
Liabilities [Abstract]
Loan funding commitments	3,400		3,500
Carrying Value [Member]
Assets [Abstract]
Cash and cash equivalents	18,307		21,853
Certificates of deposit held as investment	8,780		8,780
AFS Securities - U.S. government agency notes	12,011		10,119
HTM securities	49,911		54,303
LHFS	5,803		4,530
Loans receivable, net	661,743		660,096
Restricted stock investments	4,844		4,489
Accrued interest receivable	2,454		2,640
MSRs	499		477
IRLCs	184		22
Mandatory forward contracts	41		13
Best effort forward contracts	15		3
Liabilities [Abstract]
Deposits	589,916		602,228
Borrowings	416		395
Subordinated debentures	96,500		88,500
Accrued interest payable	20,619		20,169
Total [Member]
Assets [Abstract]
Cash and cash equivalents	18,307		21,853
Certificates of deposit held as investment	8,780		8,780
AFS Securities - U.S. government agency notes	12,011		10,119
HTM securities	49,026		54,004
LHFS	5,803		4,530
Loans receivable, net	668,451		672,349
Restricted stock investments	4,844		4,489
Accrued interest receivable	2,454		2,640
MSRs	499		477
IRLCs	184		22
Mandatory forward contracts	41		13
Best effort forward contracts	15		3
Liabilities [Abstract]
Deposits	578,257		594,659
Borrowings	416		395
Subordinated debentures	89,198		81,303
Accrued interest payable	20,619		20,619
Level 1 [Member]
Assets [Abstract]
Cash and cash equivalents	18,307		21,853
Certificates of deposit held as investment	8,780		8,780
AFS Securities - U.S. government agency notes	1,975
HTM securities	5,025		5,056
Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
AFS Securities - U.S. government agency notes	10,036		10,119
HTM securities	44,001		48,948
LHFS	5,803		4,530
Restricted stock investments	4,844		4,489
Accrued interest receivable	2,454		2,640
Mandatory forward contracts	41		13
Best effort forward contracts	15		3
Liabilities [Abstract]
Deposits	578,257		594,659
Borrowings	416		395
Subordinated debentures	89,198		81,303
Level 3 [Member]
Assets [Abstract]
Loans receivable, net	668,451		672,349
MSRs	499		477
IRLCs	184		22
Liabilities [Abstract]
Accrued interest payable	$ 20,619		$ 20,619