Purchase Credit Impaired ("PCI") Loans - Summary of FDIC Loss Share Receivable (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
FDIC Indemnification Asset [Roll Forward]
Balance January 1, 2015	$ 15,866
Cash received from the FDIC for covered assets	(1,574)	$ (4,212)
FDIC reimbursable losses, net	(751)
Amortization, net	215
Loan impairment	(2,589)
Reductions for payments on covered assets in excess of expected cash flows	(835)
Balance at end of period	$ 10,332