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FDIC Shared-loss expense (Details) - USD ($) $ in Thousands	12 Months Ended
FDIC Shared-loss expense (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
FDIC Shared-loss expense [Abstract]
FDIC indemnification asset, expense	$ 36,398	$ 62,285	$ 66,253
Change in true-up payment obligation expense	(2,677)	(3,471)	(3,014)
Reimbursement To FDIC For Recoveries	2,144	0	0
Final settlement with the FDIC on commercial loans	1,589	0	0
FDIC shared-loss expense, net	$ (42,808)	$ (65,756)	$ (69,267)