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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