Advances from the Federal Home Loan Bank (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Advances from the Federal Home Loan Bank
Percentage of total assets used to determine maximum line of credit	35.00%	25.00%
Available additional unused FHLB advances	$ 543,300	$ 399,000
Advances outstanding
Due within one year	10,000	10,000
Due over 2 years to 3 years	15,000
Due over 3 years to 4 years	22,000	5,000
Due over 4 years to 5 years	10,000
Total	$ 57,000	$ 15,000
Weighted Average Rate
Due within one year (as a percent)	0.29%	2.06%
Due over 2 years to 3 years (as a percent)	1.26%
Due over 3 years to 4 years (as a percent)	1.66%	1.20%
Due over 4 years to 5 years (as a percent)	1.66%
Total (as a percent)	1.31%	1.77%