Aging Analysis of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable Recorded Investment Past Due [Line Items]
Current	$ 800,876	$ 640,847
Total Past Due	808,754	651,642
Nonaccrual Loans	11,408	7,722
Over 90 days Accruing	7
Business
Financing Receivable Recorded Investment Past Due [Line Items]
Current	12,583	15,672
Total Past Due	12,873	15,719
Nonaccrual Loans	147	22
Consumer
Financing Receivable Recorded Investment Past Due [Line Items]
Current	886	843
Total Past Due	886	843
Construction and Land
Financing Receivable Recorded Investment Past Due [Line Items]
Current	67,240	30,340
Total Past Due	67,240	30,340
Nonaccrual Loans	1,075	1,145
Financing Receivables, 30 to 59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	2,082	6,163
Financing Receivables, 30 to 59 Days Past Due | Business
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	239	25
Financing Receivables, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		557
Financing Receivables, Over 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	5,796	4,075
Financing Receivables, Over 90 Days Past Due | Business
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	51	22
1-4 Family Investor Owned
Financing Receivable Recorded Investment Past Due [Line Items]
Current	285,485	224,368
Total Past Due	287,158	227,409
Nonaccrual Loans	2,178	2,049
Over 90 days Accruing	7
1-4 Family Investor Owned | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	1,201	2,716
1-4 Family Investor Owned | Financing Receivables, Over 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	472	325
1-4 Family Owner Occupied
Financing Receivable Recorded Investment Past Due [Line Items]
Current	96,878	92,778
Total Past Due	100,854	97,631
Nonaccrual Loans	5,317	2,109
1-4 Family Owner Occupied | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	585	2,562
1-4 Family Owner Occupied | Financing Receivables, 60 to 89 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due		557
1-4 Family Owner Occupied | Financing Receivables, Over 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	3,391	1,734
Multifamily
Financing Receivable Recorded Investment Past Due [Line Items]
Current	188,504	157,381
Total Past Due	188,550	158,200
Nonaccrual Loans	521
Multifamily | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	46	819
Nonresidential
Financing Receivable Recorded Investment Past Due [Line Items]
Current	149,300	119,465
Total Past Due	151,193	121,500
Nonaccrual Loans	2,170	2,397
Nonresidential | Financing Receivables, 30 to 59 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	11	41
Nonresidential | Financing Receivables, Over 90 Days Past Due
Financing Receivable Recorded Investment Past Due [Line Items]
Total Past Due	$ 1,882	$ 1,994