Allowance for Loan Losses Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of Activity in the Allowance for Covered Loan Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Allowance for Covered Loan Losses [Roll Forward]
Balance at beginning of period	$ 2,131	$ 10,092
Provision for covered loan losses before benefit attributable to FDIC loss share agreements	(5,350)	(11,762)
Benefit attributable to FDIC loss share agreements	4,545	9,410
Net provision for covered loan losses	(805)	(2,352)
(Decrease) increase in FDIC indemnification asset	(4,545)	(9,410)
Loans charged-off	(827)	(5,521)
Recoveries of loans charged-off	7,072	9,322
Net recoveries (charge-offs)	6,245	3,801
Balance at end of period	$ 3,026	$ 2,131