Acquired Loans Part 2 (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended			12 Months Ended		9 Months Ended	12 Months Ended		9 Months Ended		12 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Acquired Impaired [Member] Covered Loans [Member]	Dec. 31, 2013 Acquired Impaired [Member] Covered Loans [Member]		Sep. 30, 2014 Acquired Impaired [Member] Noncovered Loans [Member]	Dec. 31, 2013 Acquired Impaired [Member] Noncovered Loans [Member]		Sep. 30, 2014 Acquired Not ASC 310-30 [Member] Covered Loans [Member]		Dec. 31, 2013 Acquired Not ASC 310-30 [Member] Covered Loans [Member]		Sep. 30, 2014 Acquired Not ASC 310-30 [Member] Noncovered Loans [Member]		Dec. 31, 2013 Acquired Not ASC 310-30 [Member] Noncovered Loans [Member]
Carrying value of acquired loans [Abstract]
Net carrying value, beginning			$ 30,166	$ 45,391		$ 639,656	$ 72,942		$ 1,663	[1]	$ 2,460	[1]	$ 123,085	[1]	$ 6,696	[1]
Loans acquired				0	[2]		790,335	[2]			0	[1],[2]			153,900	[1],[2]
Accretion to interest income	38,433	28,927	3,010	5,150		35,423	35,538		(1)	[1]	159	[1]	1,442	[1]	2,628	[1]
Payments received, net			(7,831)	(18,976)		(185,880)	(229,618)		126	[1]	(819)	[1]	(37,437)	[1]	(39,281)	[1]
Other			(1,429)	(3,202)		(26,284)	(24,177)		(484)	[1]	(137)	[1]	(486)	[1]	(858)	[1]
Less change in allowance for loan losses, acquired loans			1,129	1,803		4,400	(5,364)		445	[1]	0	[1]	(513)	[1]	0	[1]
Net carrying value, ending			$ 25,045	$ 30,166		$ 467,315	$ 639,656		$ 1,749	[1]	$ 1,663	[1]	$ 86,091	[1]	$ 123,085	[1]

[1] "Acquired Not ASC 310-30" loans consist of revolving credit agreements and commercial leases that are not in scope for FASB ASC Topic 310-30.

[2] Adjusted fair value of loans acquired from BancTrust on February 15, 2013.