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Regulatory Matters (Details)
$ in Thousands
 6 Months Ended 9 Months Ended
Jun. 30, 2020
Sep. 30, 2020
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member us-gaap:AccountingStandardsUpdate202006Member    
Bank Subsidiary        
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]        
Common equity Tier 1 capital, Actual Amount     $ 1,932,546 $ 1,850,091
Common equity Tier 1 capital, Actual Ratio     0.1347 0.1290
Total capital (to risk-weighted assets), Amount        
Total capital, Actual     $ 2,078,189 $ 2,027,534
Tier I capital (to risk-weighted assets), Amount        
Tier 1 capital, Actual     1,932,546 1,850,091
Tier I capital (to average assets), Amount        
Tier 1 capital, Actual     $ 1,932,546 $ 1,850,091
Total capital and Tier I capital (to risk-weighted assets), Ratio        
Total capital (to Risk Weighted Assets), Actual     0.1449 0.1414
Total capital (to Risk Weighted Assets), Required For Capital Adequacy Purposes     0.0800 0.0800
Tier 1 capital (to Risk Weighted Assets), Actual     0.1347 0.1290
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)     0.1156 0.1133
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     $ 645,615 $ 645,277
Total capital, Required For Capital Adequacy Purposes     1,147,759 1,147,159
Tier 1 capital, Required For Capital Adequacy Purposes     860,820 860,369
Tier 1 capital, Required For Capital Adequacy Purposes     668,416 653,241
Common equity Tier 1 capital, Required To Be Well Capitalized Under Prompt Corrective Action Provisions, Amount     932,555 932,066
Total capital, Required To Be Well Capitalized Under Prompt Corrective Action Provisions     $ 1,434,699 $ 1,433,948
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     $ 1,147,759 $ 1,147,159
Tier 1 capital, Required To Be Well Capitalized Under Prompt Corrective Action Provisions     $ 835,520 $ 816,551
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     $ 1,642,492 $ 1,568,508
Common equity Tier 1 capital, Actual Ratio     0.1144 0.1094
Total capital (to risk-weighted assets), Amount        
Total capital, Actual     $ 1,888,996 $ 1,846,229
Total capital, Minimum Capital Adequacy With Capital Conservation Buffer     1,507,242 1,505,853
Tier I capital (to risk-weighted assets), Amount        
Tier 1 capital, Actual     1,743,353 1,668,786
Tier 1 capital, Minimum Capital Adequacy With Capital Conservation Buffer     1,220,148 1,219,024
Tier I capital (to average assets), Amount        
Tier 1 capital, Actual     $ 1,743,353 $ 1,668,786
Total capital and Tier I capital (to risk-weighted assets), Ratio        
Total capital (to Risk Weighted Assets), Actual     0.1316 0.1287
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     0.1214 0.1164
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)     0.1043 0.1022
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     $ 1,148,375 1,147,317
Tier 1 capital, Required For Capital Adequacy Purposes     861,281 860,487
Tier 1 capital, Required For Capital Adequacy Purposes     668,540 653,163
Bank        
Total capital (to risk-weighted assets), Amount        
Total capital, Minimum Capital Adequacy With Capital Conservation Buffer     1,506,434 1,505,646
Tier I capital (to risk-weighted assets), Amount        
Tier 1 capital, Minimum Capital Adequacy With Capital Conservation Buffer     $ 1,219,494 $ 1,218,856
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     $ 1,004,828 $ 1,003,902
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     $ 645,961  
Common Equity Tier 1 | Bank        
Tier I capital (to risk-weighted assets), Amount        
Tier 1 capital, Minimum Capital Adequacy With Capital Conservation Buffer     $ 1,004,289 $ 1,003,764
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