Regulatory Matters (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 capital (to risk weighted assets) minimum required for capital adequacy purposes	7.00%	7.00%
CET1 capital (to risk weighted assets) to be well capitalized under prompt corrective action regulations	6.50%	6.50%
Total capital (to risk weighted assets) minimum required for capital adequacy purposes	0.10500	0.10500
Total capital (to risk weighted assets) to be well capitalized under prompt corrective action regulations	0.100	0.100
Tier 1 capital (to risk weighted assets) minimum required for capital adequacy purposes	0.08500	0.08500
Tier 1 capital (to risk weighted assets) to be well capitalized under prompt corrective action regulations	0.080	0.080
Tier 1 capital (to average assets) minimum required for capital adequacy purposes	0.04000	0.04000
Tier 1 capital (to average assets) to be well capitalized under prompt corrective action regulations	0.050	0.050
Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 capital (to risk weighted assets) actual amount	$ 1,244,028	$ 1,225,486
CET1 capital (to risk weighted assets) actual ratio	14.90%	14.64%
Total capital (to risk weighted assets) actual amount	$ 1,338,356	$ 1,299,223
Total capital (to risk weighted assets) actual ratio	0.1603	0.1552
Tier 1 capital (to risk weighted assets) actual amount	$ 1,244,028	$ 1,225,486
Tier 1 capital (to risk weighted assets) actual ratio	0.1490	0.1464
Tier 1 capital (to average assets) actual amount	$ 1,244,028	$ 1,225,486
Tier 1 capital (to average assets) actual ratio	0.1129	0.1318
Parent Company
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
CET1 capital (to risk weighted assets) actual amount	$ 1,137,896	$ 1,082,516
CET1 capital (to risk weighted assets) actual ratio	13.49%	12.87%
Total capital (to risk weighted assets) actual amount	$ 1,438,224	$ 1,362,253
Total capital (to risk weighted assets) actual ratio	0.1704	0.1620
Tier 1 capital (to risk weighted assets) actual amount	$ 1,137,896	$ 1,082,516
Tier 1 capital (to risk weighted assets) actual ratio	0.1349	0.1287
Tier 1 capital (to average assets) actual amount	$ 1,137,896	$ 1,082,516
Tier 1 capital (to average assets) actual ratio	0.1031	0.1162

The amount of CET1 capital as defined in the regulations.

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The CET1 risk based capital ratio (CET1 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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Amount of total capital as defined by regulatory framework.

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Ratio of minimum total risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of Tier 1 leverage capital as defined by regulatory framework.

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