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Regulatory Matters (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
CET1 capital (to risk weighted aseets) minimum required for capital adequacy purposes		6.375%	5.75%
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		9.875%	9.25%
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		7.875%	7.25%
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		$ 1,147,151	$ 969,250
CET1 capital (to risk weighted aseets) actual ratio		14.23%	12.91%
Total capital (to risk weighted assets) actual amount		$ 1,217,140	$ 1,033,554
Total capital (to risk weighted assets) actual ratio		15.10%	13.76%
Tier 1 capital (to risk weighted assets) actual amount		$ 1,147,151	$ 969,250
Tier 1 capital (to risk weighted assets) actual ratio		14.23%	12.91%
Tier 1 capital (to average assets) actual amount		$ 1,147,151	$ 969,250
Tier 1 capital (to average assets) actual ratio		13.78%	13.15%
Parent Company [Member]
CET1 capital (to risk weighted aseets) actual amount		$ 1,007,438	$ 845,123
CET1 capital (to risk weighted aseets) actual ratio		12.49%	11.23%
Total capital (to risk weighted assets) actual amount		$ 1,297,427	$ 1,129,954
Total capital (to risk weighted assets) actual ratio		16.08%	15.02%
Tier 1 capital (to risk weighted assets) actual amount		$ 1,007,438	$ 845,123
Tier 1 capital (to risk weighted assets) actual ratio		12.49%	11.23%
Tier 1 capital (to average assets) actual amount		$ 1,007,438	$ 845,123
Tier 1 capital (to average assets) actual ratio		12.10%	11.45%
[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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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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