FDIC Indemnification Asset (Details) - USD ($) $ in Thousands			12 Months Ended
	Jun. 23, 2016	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Receivable from FDIC for Loss Share Agreements
Balance at beginning of period			$ 4,401	$ 22,161	$ 86,447
Decrease in expected losses on loans			(23)	(788)	(2,421)
Additional recoveries on OREO			(1,736)	(5,440)	(4,520)
Reimbursable expenses			71	789	2,829
Amortization of discounts and premiums, net			(1,475)	(8,587)	(21,895)
Reimburesements from FDIC				(3,734)	(38,279)
Payments to (from) FDIC			853
Termination of Loss Share Agreement			(2,091)
Balance at end of period				4,401	22,161
Pre- tax charge	$ 4,400
Payment to settle FDIC loss share agreements	2,300		2,342
Amortization of FDIC indemnification assets, net		$ 2,100	5,902	8,587	21,895
FDIC indemnification asset			4,401	$ 22,161	$ 86,447	$ 4,401	$ 22,161	$ 86,447
Covered loans	87,400
Covered Other real estate under share agreements	$ 3,000		$ 18,316			$ 30,554	$ 42,726	$ 64,918