Nature of Operations and Basis of Presentation (Details) (USD $)	12 Months Ended				6 Months Ended	12 Months Ended			12 Months Ended
	Dec. 31, 2013 business_segments	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Jun. 30, 2012 Granite Corp. [Member]	Dec. 31, 2012 Granite Corp. [Member] balance	Dec. 31, 2013 Granite Corp. [Member]	Dec. 31, 2011 Granite Corp. [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Minimum [Member]	Dec. 31, 2013 Buildings and Improvements [Member] Maximum [Member]	Dec. 31, 2013 Furniture and Equipment [Member] Minimum [Member]	Dec. 31, 2013 Furniture and Equipment [Member] Maximum [Member]	Dec. 31, 2013 Core Deposits [Member] Minimum [Member]	Dec. 31, 2013 Core Deposits [Member] Maximum [Member]
Nature of Operations [Line Items]
Number of business segments	1
Amortized cost	$ 151,795,000
Loans placed on nonaccrual, period of delinquency	90 days
Change to accrual status, minimum repayment performance	6 months
Uncollectible loan criteria, period of unpaid scheduled payments	4 months
Allowance of loan losses	26,785,000	29,314,000	39,360,000	93,687,000		5,400,000	5,600,000
Accretable yield						20,500,000	16,000,000	4,800,000
Estimated useful lives of premises and equipment									10 years	50 years	3 years	10 years
Estimated useful lives of intangible assets													8 years	10 years
Cumulative pre-tax loss position, period	3 years
Total comprehensive loss	(18,765,000)	(36,359,000)	(137,592,000)
Deferred income tax related to the components of other comprehensive loss	11,000,000	200,000	2,600,000
Pension Expense	300,000	400,000	400,000
Deferred gain recognized in other comprehensive income	0	440,000	0
Employer matching contribution percentage	50.00%				50.00%
Percentage of pay deferred by employee eligible for employer matching contributions	6.00%				6.00%
Matching and discretionary contributions	$ 500,000	$ 600,000	$ 400,000
Non-tax qualified profit-sharing supplemental executive retirement plan, remaining balances paid						2