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Regulatory Matters (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
CET1 capital (to risk weighted aseets) minimum required for capital adequacy purposes		5.75%	5.125%
CET1 capital (to risk weighted aseets) to be well capitalized under prompt corrective action regulations	[1]	6.50%	6.50%
Total capital (to risk weighted assets) minimum required for capital adequacy purposes		9.25%	8.625%
Total capital (to risk weighted assets) to be well capitalized under prompt corrective action regulations	[1]	10.00%	10.00%
Tier 1 capital (to risk weighted assets) minimum required for capital adequacy purposes		7.25%	6.625%
Tier 1 capital (to risk weighted assets) to be well capitalized under prompt corrective action regulations	[1]	8.00%	8.00%
Tier 1 capital (to average assets) minimum required for capital adequacy purposes		5.00%	5.00%
Tier 1 capital (to average assets) to be well capitalized under prompt corrective action regulations	[1]	5.00%	5.00%
Bank [Member]
CET1 capital (to risk weighted aseets) actual amount		$ 969,250	$ 854,226
CET1 capital (to risk weighted aseets) actual ratio		12.91%	12.55%
Total capital (to risk weighted assets) actual amount		$ 1,033,554	$ 913,100
Total capital (to risk weighted assets) actual ratio		13.76%	13.41%
Tier 1 capital (to risk weighted assets) actual amount		$ 969,250	$ 854,226
Tier 1 capital (to risk weighted assets) actual ratio		12.91%	12.55%
Tier 1 capital (to average assets) actual amount		$ 969,250	$ 854,226
Tier 1 capital (to average assets) actual ratio		13.15%	12.44%
Parent Company [Member]
CET1 capital (to risk weighted aseets) actual amount		$ 845,123	$ 737,512
CET1 capital (to risk weighted aseets) actual ratio		11.23%	10.80%
Total capital (to risk weighted assets) actual amount		$ 1,129,954	$ 1,016,712
Total capital (to risk weighted assets) actual ratio		15.02%	14.89%
Tier 1 capital (to risk weighted assets) actual amount		$ 845,123	$ 737,512
Tier 1 capital (to risk weighted assets) actual ratio		11.23%	10.80%
Tier 1 capital (to average assets) actual amount		$ 845,123	$ 737,512
Tier 1 capital (to average assets) actual ratio		11.45%	10.72%
[1] Applies to Bank only

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The amount of CET1 capital as defined in the regulations.

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The amount of total capital as defined in the regulations.

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The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under 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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