Regulatory Capital - Well Capitalized Regulatory Requirements (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Actual
Tier I Capital (to Average Assets)	$ 1,221,416	$ 997,463
Tier I Capital (to Risk Weighted Assets)	1,221,416	997,463
Total Capital (to Risk Weighted Assets)	1,289,497	1,066,652
Actual Ratio
Tier I Capital (to Average Assets)	11.70%	11.50%
Tier I Capital (to Risk Weighted Assets)	16.40%	15.00%
Total Capital (to Risk Weighted Assets)	17.30%	16.10%
Well Capitalized Regulatory Requirements, Amount
Tier I Capital (to Average Assets)	521,973	432,324
Tier I Capital (to Risk Weighted Assets)	446,860	398,105
Total Capital (to Risk Weighted Assets)	$ 745,374	$ 663,509
Well Capitalized Regulatory Requirements, Ratio
Tier I Capital (to Average Assets)	5.00%	5.00%
Tier I Capital (to Risk Weighted Assets)	6.00%	6.00%
Total Capital (to Risk Weighted Assets)	10.00%	10.00%

The amount of total capital as defined in the regulations.

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The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

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The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.

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Total Capital divided by risk weighted assets as defined in the regulations.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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The amount of Tier 1 Leverage Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action.

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The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action.

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Tier 1 Leverage Capital divided by average assets as defined in the regulations.

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Tier 1 Risk Based Capital as defined in the regulations.

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The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action.

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The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

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Tier 1 capital divided by risk weighted assets as defined by regulations.

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