Summary of FHLB Advances (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
FHLB Advances
Maturing within one year, Amount	$ 93,979	$ 559,084
Maturing within one year, Weighted rate	2.81%	0.24%
Maturing one year through two years, Amount	45,042	77,979
Maturing one year through two years, Weighted rate	2.99%	3.36%
Maturing two years through three years, Amount	0	45,042
Maturing two years through three years, Weighted rate	0.00%	2.99%
Maturing three years through four years, Amount	20,250	0
Maturing three years through four years, Weighted rate	2.83%	0.00%
Maturing four years through five years, Amount	174	20,250
Maturing four years through five years, Weighted rate	4.74%	2.83%
Thereafter, Amount	137,499	137,827
Thereafter, Weighted rate	3.12%	3.12%
Total, Amount	$ 296,944	$ 840,182
Total, Weighted rate	2.98%	1.21%