Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Increase to loans and leases	$ 17,355,240	$ 16,866,536	$ 15,988,752
Increase to total assets	24,132,507	23,406,381
Increase to other liabilities	348,889	299,818
Increase to total liabilities	$ 20,230,349	19,557,047
Error related to accounting for loans sold to GNMA that have become past due 90 day or more
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Increase to loans and leases		19,200
Increase to total assets		19,200
Increase to other liabilities		19,200
Increase to total liabilities		$ 19,200