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Regulatory Capital - Well Capitalized Regulatory Requirements (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Actual
Tier I Capital (to Average Assets)	$ 1,587,562	$ 1,413,988
Tier I Capital (to Risk-Weighted Assets)	1,587,562	1,413,988
Total Capital (to Risk-Weighted Assets)	1,679,428	$ 1,497,830
Common Equity Tier I Capital (to Risk-Weighted Assets)	$ 1,587,562
Actual Ratio
Tier I Capital (to Average Assets)	12.50%	11.50%
Tier I Capital (to Risk-Weighted Assets)	15.20%	15.00%
Total Capital (to Risk-Weighted Assets)	16.00%	15.90%
Common Equity Tier I Capital (to Risk-Weighted Assets)	15.20%
Well Capitalized Regulatory Requirements, Amount
Tier I Capital (to Average Assets)	$ 634,691	$ 614,709
Tier I Capital (to Risk-Weighted Assets)	838,239	565,148
Total Capital (to Risk-Weighted Assets)	1,047,799	$ 941,913
Common Equity Tier I Capital (to Risk-Weighted Assets)	$ 681,069
Well Capitalized Regulatory Requirements, Ratio
Tier I Capital (to Average Assets)	5.00%	5.00%
Tier I Capital (to Risk-Weighted Assets)	8.00%	6.00%
Total Capital (to Risk-Weighted Assets)	10.00%	10.00%
Common Equity Tier I Capital (to Risk-Weighted Assets)	6.50%

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Common Equity Tier 1 to Risk Weighted Assets

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The amount of total capital as defined in the regulations.

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