Loans and Allowance - Corporation's loan portfolio aging analysis (Details 4) (Loans Receivable, USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due	$ 1,822	$ 2,549
60-89 Days Past Due	768	131
Greater than 90 Days	2,970	8,157
Total Past Due	5,560	10,837
Current	306,121	250,805
Purchased Credit Impaired Loans	3,103
Total loans receivables, gross	314,784	261,642
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due	63	335
60-89 Days Past Due
Greater than 90 Days	225
Total Past Due	288	335
Current	10,496	7,973
Purchased Credit Impaired Loans
Total loans receivables, gross	10,784	8,308
1-4 family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due	1,347	1,172
60-89 Days Past Due	768	26
Greater than 90 Days	1,408	2,946
Total Past Due	3,523	4,144
Current	132,459	107,054
Purchased Credit Impaired Loans	1,420
Total loans receivables, gross	137,402	111,198
Multi-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due
60-89 Days Past Due
Greater than 90 Days
Total Past Due
Current	19,537	18,582
Purchased Credit Impaired Loans	451
Total loans receivables, gross	19,988	18,582
Nonresidential
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due	276	949
60-89 Days Past Due		105
Greater than 90 Days	753	1,831
Total Past Due	1,029	2,885
Current	104,541	80,399
Purchased Credit Impaired Loans	863
Total loans receivables, gross	106,433	83,284
Land
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due		8
60-89 Days Past Due
Greater than 90 Days	331	3,080
Total Past Due	331	3,088
Current	15,090	15,993
Purchased Credit Impaired Loans	301
Total loans receivables, gross	15,722	19,081
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due	100	41
60-89 Days Past Due
Greater than 90 Days	251	297
Total Past Due	351	338
Current	19,160	17,011
Purchased Credit Impaired Loans	38
Total loans receivables, gross	19,549	17,349
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
30-59 Days Past Due	36	44
60-89 Days Past Due
Greater than 90 Days	2	3
Total Past Due	38	47
Current	4,838	3,793
Purchased Credit Impaired Loans	30
Total loans receivables, gross	$ 4,906	$ 3,840