Loans and Allowance for Loan Losses (Purchased Loans with Deteriorated Credit Quality) (Details) (Granite Corp [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Granite Corp [Member]
Deterioarted Loans Acquired Movement Schedule [Roll Forward]
Subtotal before allowance	$ 149,033	$ 205,884	$ 161,652
Accretion	2,415	4,191	5,079	8,394
Reclassification of loans and adjustments			(4,180)
Payment received	(9,524)	(20,403)	(20,605)	(46,331)
Foreclosed and transferred to OREO	0	(513)	(22)	(1,296)
Subtotal before allowance	141,924	189,159	141,924	189,159
Subtotal before provision	(4,123)	(4,066)	(4,123)	(4,066)
Balance, end of period	137,801	185,093	137,801	185,093	161,652	228,392
Deteriorated Loans Acquired, Accretable Yield Movement Schedule [Roll Forward]
Future accretion balance, beginning of period	28,327	26,096	29,987	30,299
Accretion	(2,415)	(4,191)	(5,079)	(8,394)
Increase in future accretion	1,852	6,801	2,856	6,801
Future accretion balance, end of period	$ 27,764	$ 28,706	$ 27,764	$ 28,706