Loans (Covered Loan Loss Share Receivable) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Loss Share Receivable
Loss Share Receivable Rollforward [Roll Forward]
Balance at beginning of period	$ 20,005	$ 54,748	$ 22,033	$ 61,827
Amortization	(1,185)	(4,185)	(3,372)	(10,048)
Increase/(decrease) due to impairment (recapture) on FDIC acquired loans	1,819	(3,897)	6,046	927
FDIC reimbursement	(8,713)	(1,237)	(12,726)	(6,324)
FDIC acquired loans paid in full	(106)	(1,448)	(161)	(2,401)
Balance at end of the period (1)	11,820	$ 43,981	11,820	$ 43,981
Loss Share Receivable | Single Family Loss Share Agreement
Loss Share Receivable Rollforward [Roll Forward]
Balance at end of the period (1)	(11,800)		(11,800)
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	13,100		13,100
Midwest acquisition | Single Family Loss Share Agreement
Changes in Loss Share Receivable Associated with Covered Loans [Line Items]
Loans and Leases Receivable, Gross, Consumer	$ 82,800		$ 82,800