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Regulatory Matters (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2020 USD ($) | Mar. 31, 2021 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member | hope:AccountingStandardsUpdate202006Member |
Bank Subsidiary |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Common equity Tier 1 capital, Actual Amount |  | $ 1,850,091 | $ 1,878,163
Common equity Tier 1 capital, Actual Ratio |  | 0.1290 | 0.1310
Total capital (to risk-weighted assets), Amount |  |  |
Total capital, Actual |  | $ 2,027,534 | $ 2,057,351
Tier I capital (to risk-weighted assets), Amount |  |  |
Tier 1 capital, Actual |  | 1,850,091 | 1,878,163
Tier I capital (to average assets), Amount |  |  |
Tier 1 capital, Actual |  | $ 1,850,091 | $ 1,878,163
Total capital and Tier I capital (to risk-weighted assets), Ratio |  |  |
Total capital (to Risk Weighted Assets), Actual |  | 0.1414 | 0.1435
Total capital (to Risk Weighted Assets), Required For Capital Adequacy Purposes |  | 0.0800 | 0.0800
Tier 1 capital (to Risk Weighted Assets), Actual |  | 0.1290 | 0.1310
Tier 1 capital (to Risk Weighted Assets), Required For Capital Adequacy Purposes |  | 0.0600 | 0.0600
Tier 1 capital (to Risk Weighted Assets), Required To Be Well Capitalized Under Prompt Corrective Action Provisions |  | 0.0800 | 0.0800
Tier I capital (to average assets), Ratio |  |  |
Tier I Capital (to Average Assets), Actual (Leverage) |  | 0.1133 | 0.1129
Tier I Capital (to Average Assets), Minimum For Capital Adequacy Purposes (Leverage) |  | 0.0400 | 0.0400
Banking Regulation, Common Equity Tier One Risk-Based Capital, Capital Adequacy, Minimum |  | $ 645,277 | $ 644,970
Total capital, Required For Capital Adequacy Purposes |  | 1,147,159 | 1,146,613
Tier 1 capital, Required For Capital Adequacy Purposes |  | 860,369 | 859,960
Tier 1 capital, Required For Capital Adequacy Purposes |  | 653,241 | 665,200
Common equity Tier 1 capital, Required To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount |  | 932,066 | 931,623
Total capital, Required To Be Well Capitalized Under Prompt Corrective Action Provisions |  | $ 1,433,948 | $ 1,433,266
Total capital (to Risk Weighted Assets), Required To Be Well Capitalized Under Prompt Corrective Action Provisions |  | 0.1000 | 0.1000
Tier 1 capital, Required To Be Well Capitalized Under Prompt Corrective Action Provisions |  | $ 1,147,159 | $ 1,146,613
Tier 1 capital, Required To Be Well Capitalized Under Prompt Corrective Action Provisions |  | $ 816,551 | $ 831,501
Tier I Capital (to Average Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Leverage) |  | 0.0500 | 0.0500
Company |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Common equity Tier 1 capital, Actual Amount |  | $ 1,568,508 | $ 1,588,161
Common equity Tier 1 capital, Actual Ratio |  | 0.1094 | 0.1108
Total capital (to risk-weighted assets), Amount |  |  |
Total capital, Actual |  | $ 1,846,229 | $ 1,867,993
Total capital, Minimum Capital Adequacy With Capital Conservation Buffer |  | 1,505,853 | 1,505,577
Tier I capital (to risk-weighted assets), Amount |  |  |
Tier 1 capital, Actual |  | 1,668,786 | 1,688,728
Tier 1 capital, Minimum Capital Adequacy With Capital Conservation Buffer |  | 1,219,024 | 1,218,800
Tier I capital (to average assets), Amount |  |  |
Tier 1 capital, Actual |  | $ 1,668,786 | $ 1,688,728
Total capital and Tier I capital (to risk-weighted assets), Ratio |  |  |
Total capital (to Risk Weighted Assets), Actual |  | 0.1287 | 0.1303
Total capital (to Risk Weighted Assets), Required For Capital Adequacy Purposes |  | 0.0800 | 0.0800
Total capital (to Risk Weighted assets), Minimum Capital Adequacy With Capital Conservation Buffer |  | 10.50% | 10.50%
Tier 1 capital (to Risk Weighted Assets), Actual |  | 0.1164 | 0.1178
Tier 1 capital (to Risk Weighted Assets), Required For Capital Adequacy Purposes |  | 0.0600 | 0.0600
Tier 1 capital (to Risk Weighted Assets), Minimum Capital Adequacy With Capital Conservation Buffer |  | 8.50% | 8.50%
Tier I capital (to average assets), Ratio |  |  |
Tier I Capital (to Average Assets), Actual (Leverage) |  | 0.1022 | 0.1015
Tier I Capital (to Average Assets), Minimum For Capital Adequacy Purposes (Leverage) |  | 0.0400 | 0.0400
Banking Regulation, Common Equity Tier One Risk-Based Capital, Capital Adequacy, Minimum |  | $ 645,366 |
Total capital, Required For Capital Adequacy Purposes |  | 1,147,317 | $ 1,147,106
Tier 1 capital, Required For Capital Adequacy Purposes |  | 860,487 | 860,330
Tier 1 capital, Required For Capital Adequacy Purposes |  | 653,163 | 665,230
Bank |  |  |
Total capital (to risk-weighted assets), Amount |  |  |
Total capital, Minimum Capital Adequacy With Capital Conservation Buffer |  | 1,505,646 | 1,504,929
Tier I capital (to risk-weighted assets), Amount |  |  |
Tier 1 capital, Minimum Capital Adequacy With Capital Conservation Buffer |  | $ 1,218,856 | $ 1,218,276
Total capital and Tier I capital (to risk-weighted assets), Ratio |  |  |
Total capital (to Risk Weighted assets), Minimum Capital Adequacy With Capital Conservation Buffer |  | 10.50% | 10.50%
Tier 1 capital (to Risk Weighted Assets), Minimum Capital Adequacy With Capital Conservation Buffer |  | 8.50% | 8.50%
Common Equity Tier 1 | Company |  |  |
Tier I capital (to risk-weighted assets), Amount |  |  |
Tier 1 capital, Minimum Capital Adequacy With Capital Conservation Buffer |  | $ 1,003,902 | $ 1,003,718
Total capital and Tier I capital (to risk-weighted assets), Ratio |  |  |
Tier 1 capital (to Risk Weighted Assets), Required For Capital Adequacy Purposes |  | 0.0450 | 0.0450
Tier 1 capital (to Risk Weighted Assets), Minimum Capital Adequacy With Capital Conservation Buffer |  | 7.00% | 7.00%
Tier I capital (to average assets), Ratio |  |  |
Tier 1 capital, Required For Capital Adequacy Purposes |  |  | $ 645,247
Common Equity Tier 1 | Bank |  |  |
Tier I capital (to risk-weighted assets), Amount |  |  |
Tier 1 capital, Minimum Capital Adequacy With Capital Conservation Buffer |  | $ 1,003,764 | $ 1,003,286
Total capital and Tier I capital (to risk-weighted assets), Ratio |  |  |
Tier 1 capital (to Risk Weighted Assets), Minimum Capital Adequacy With Capital Conservation Buffer |  | 7.00% | 7.00%
Common equity tier 1 capital | Bank Subsidiary |  |  |
Total capital and Tier I capital (to risk-weighted assets), Ratio |  |  |
Tier 1 capital (to Risk Weighted Assets), Required For Capital Adequacy Purposes |  | 0.0450 | 0.0450
Tier 1 capital (to Risk Weighted Assets), Required To Be Well Capitalized Under Prompt Corrective Action Provisions |  | 0.0650 | 0.0650

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