Loans (Covered Loan Loss Share Receivable) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Loss Share Receivable
Loss Share Receivable Rollforward [Roll Forward]
Balance at beginning of period	$ 11,820	$ 43,981	$ 22,033	$ 61,827
Amortization	(384)	(6,932)	(3,756)	(16,980)
Increase/(decrease) due to impairment (recapture) on FDIC acquired loans	257	2,908	6,303	3,835
FDIC reimbursement	(679)	(7,006)	(13,405)	(13,330)
FDIC acquired loans paid in full	(88)	(2,205)	(249)	(4,606)
Balance at end of the period (1)	10,926	$ 30,746	10,926	$ 30,746
Loss Share Receivable | Single Family Loss Share Agreement
Loss Share Receivable Rollforward [Roll Forward]
Balance at end of the period (1)	(10,900)		(10,900)
George Washington acquisition | Single Family Loss Share Agreement
Changes in Loss Share Receivable Associated with Covered Loans [Line Items]
Loans and Leases Receivable, Gross, Consumer	12,700		12,700
Midwest acquisition | Single Family Loss Share Agreement
Changes in Loss Share Receivable Associated with Covered Loans [Line Items]
Loans and Leases Receivable, Gross, Consumer	$ 73,200		$ 73,200