Fair Value of Financial Instruments, Assets, Balance Sheet Grouping (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Assets [Abstract]
AFS Securities	$ 10,992		$ 11,978
HTM securities	35,398		38,212
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
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	118,100		115,000
Standby Letters of Credit [Member]
Liabilities [Abstract]
Loan funding commitments	3,300
Carrying Value [Member]
Assets [Abstract]
Cash and cash equivalents	113,101		188,340
Certificates of deposit held as investment	8,780		8,780
AFS Securities	10,992		11,978
HTM securities	35,793		38,912
LHFS	6,660		9,686
Loans receivable, net	666,135		674,305
Restricted stock investments	2,856		3,766
Accrued interest receivable	2,632		2,848
MSRs	400		437
IRLCs	335		100
Liabilities [Abstract]
Deposits	709,873		779,506
Accrued interest payable	387		419
Borrowings	48,500		73,500
Subordinated debentures	20,619		20,619
Mandatory forward contracts	7		16
Best effort forward contracts	16
Total [Member]
Assets [Abstract]
Cash and cash equivalents	113,101		188,340
Certificates of deposit held as investment	8,780		8,780
AFS Securities	10,992		11,978
HTM securities	35,398		38,212
LHFS	6,660		9,686
Loans receivable, net	668,511		670,512
Restricted stock investments	2,856		3,766
Accrued interest receivable	2,632		2,848
MSRs	400		437
IRLCs	335		100
Liabilities [Abstract]
Deposits	711,905		778,313
Accrued interest payable	387		419
Borrowings	44,511		69,210
Subordinated debentures	20,619		20,619
Mandatory forward contracts	7		16
Best effort forward contracts	16
Level 1 [Member]
Assets [Abstract]
Cash and cash equivalents	113,101		188,340
Certificates of deposit held as investment	8,780		8,780
AFS Securities	1,988		1,981
HTM securities	2,008		2,008
Level 2 [Member]
Assets [Abstract]
AFS Securities	9,004		9,997
HTM securities	33,390		36,204
LHFS	6,660		9,686
Restricted stock investments	2,856		3,766
Accrued interest receivable	2,632		2,848
Liabilities [Abstract]
Deposits	711,905		778,313
Accrued interest payable	387		419
Borrowings	44,511		69,210
Mandatory forward contracts	7		16
Best effort forward contracts	16
Level 3 [Member]
Assets [Abstract]
Loans receivable, net	668,511		670,512
MSRs	400		437
IRLCs	335		100
Liabilities [Abstract]
Subordinated debentures	$ 20,619		$ 20,619