Nature of Operations and Summary of Significant Accounting Policies (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2012	Jan. 01, 2013	Apr. 30, 2012 Segment Subsidiary Commercial_Bank
Nature of Operations and Summary of Significant Accounting Policies (Additional Textual) [ Abstract]
Number of Bank Divisions Subsequent to Charter Consolidation			11
Number of Bank Subsidiaries Prior to Charter Consolidation			11
Number of Operating Segments Subsequent to Charter Consolidation			1
FDIC insurance coverage for non-interest bearing deposits		$ 250,000
Minimum period past due to consider loan as delinquent	30 days
Minimum period past due to consider loan as non accrual	90 days
Minimum number of days delinquent to charge off consumer loans	120 days
Maximum period up to which purchase price of business is allocated to assets acquired and liabilities assumed	1 year
Number of Operating Segments Prior to Charter Consolidation			11
Number of Bank Division Reporting Units Aggregated for Goodwill Assessment	11		11
Number of Reporting Units Subsequent to Aggregation for Goodwill Assessment	1
Number of Months Preceding the Testing Date for Deal Price Multiple	12
Percentage of likelihood for term more likely than not	50.00%
Core Deposits [Member]
Nature of Operations and Summary of Significant Accounting Policies (Textual) [Abstract]
Maximum amortization period of core deposit intangibles	10
Office Buildings [Member]
Nature of Operations and Summary of Significant Accounting Policies (Textual) [Abstract]
Property, Plant and Equipment, Useful Life, Minimum	15
Property, Plant and Equipment, Useful Life, Maximum	40
Furniture, fixtures and equipment [Member]
Nature of Operations and Summary of Significant Accounting Policies (Textual) [Abstract]
Property, Plant and Equipment, Useful Life, Minimum	3
Property, Plant and Equipment, Useful Life, Maximum	10