Acquired Loans Part 1 (Details) - USD ($) $ in Thousands		9 Months Ended		12 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Carrying value of acquired loans [Abstract]
Accretion to interest income		$ 24,907	$ 38,433
Acquired Impaired [Member] | Noncovered Loans [Member]
Carrying value of acquired loans [Abstract]
Carrying value, net, beginning		434,151	639,656	$ 639,656
Accretion to interest income		23,054		44,575
Payments received, net		(135,701)		(216,378)
Other	[1]	1,174		(29,724)
Less change in allowance for loan losses, acquired loans		(876)		(3,978)
Carrying value, net, ending		321,802		434,151
Acquired Impaired [Member] | Covered Loans [Member]
Carrying value of acquired loans [Abstract]
Carrying value, net, beginning		20,504	30,166	30,166
Accretion to interest income		1,853		4,052
Payments received, net		(6,790)		(12,396)
Other	[1]	6		(1,733)
Less change in allowance for loan losses, acquired loans		750		415
Carrying value, net, ending		16,323		20,504
Acquired Not ASC 310-30 [Member] | Noncovered Loans [Member]
Carrying value of acquired loans [Abstract]
Carrying value, net, beginning	[2]	81,091	123,085	123,085
Accretion to interest income	[2]	477		1,706
Payments received, net	[2]	(14,259)		(42,284)
Other	[1],[2]	0		(2,102)
Less change in allowance for loan losses, acquired loans	[2]	0		686
Carrying value, net, ending	[2]	67,309		81,091
Acquired Not ASC 310-30 [Member] | Covered Loans [Member]
Carrying value of acquired loans [Abstract]
Carrying value, net, beginning	[2]	1,604	$ 1,663	1,663
Accretion to interest income	[2]	0		1
Payments received, net	[2]	(50)		(30)
Other	[1],[2]	0		(484)
Less change in allowance for loan losses, acquired loans	[2]	0		454
Carrying value, net, ending	[2]	$ 1,554		$ 1,604

[1] Includes miscellaneous timing adjustments as well as acquired loan terminations through foreclosure, charge-off, pool recovery and other terminations.

[2] "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, "Loans and Debt Securities Acquired with Deteriorated Credit Quality."