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Regulatory Matters (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Parent Company |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common Equity Tier One Capital | $ 1,458,344 | $ 1,471,193
Common Equity Tier One Capital Ratio | 11.44% | 12.30%
Common Equity Tier One Capital Required for Capital Adequacy | $ 573,723 | $ 538,435
Total capital (to risk-weighted assets), Amount |  |
Total Capital, Actual | 1,649,664 | 1,653,521
Total Capital, Required For Capital Adequacy Purposes | 1,019,952 | 957,217
Tier I capital (to risk-weighted assets), Amount |  |
Tier I Capital, Actual (Risk Based) | 1,556,371 | 1,568,144
Tier One Risk Based Capital Required for Capital Adequacy | 764,964 | 717,913
Tier I capital (to average assets), Amount |  |
Tier I Capital, Actual (Leverage) | 1,556,371 | 1,568,144
Tier I Capital, Required For Capital Adequacy Purposes | $ 590,176 | $ 543,528
Total capital and Tier I capital (to risk-weighted assets), Ratio |  |
Total Capital (to Risk Weighted Assets), Actual | 12.94% | 13.82%
Total Capital (to Risk Weighted Assets), Minimum For Capital Adequacy Purposes | 8.00% | 8.00%
Tier I Capital (to Risk Weighted Assets), Actual (Risk Based) | 12.21% | 13.11%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 6.00% | 6.00%
Required for Capital Adequacy with Capital Buffer | $ 1,259,004 | $ 1,106,782
Required for Capital Adequacy with Capital Buffer to Risk Weighted Assets | 9.875% | 9.25%
Tier One Required for Capital Adequacy with Capital Buffer | $ 1,004,015 | $ 867,478
Tier One Required for Capital Adequacy with Capital Buffer to Risk Weighted Assets | 7.875% | 7.25%
Tier I capital (to average assets), Ratio |  |
Tier I Capital (to Average Assets), Actual (Leverage) | 10.55% | 11.54%
Tier I Capital (to Average Assets), Minimum For Capital Adequacy Purposes (Leverage) | 4.00% | 4.00%
Subsidiaries [Member] |  |
Total capital and Tier I capital (to risk-weighted assets), Ratio |  |
Required for Capital Adequacy with Capital Buffer | $ 1,258,951 | $ 1,106,255
Required for Capital Adequacy with Capital Buffer to Risk Weighted Assets | 9.875% | 9.25%
Tier One Required for Capital Adequacy with Capital Buffer | $ 812,740 | $ 687,672
Tier One Required for Capital Adequacy with Capital Buffer to Risk Weighted Assets | 7.875% | 7.25%
Bank |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common Equity Tier One Capital | $ 1,737,092 | $ 1,548,401
Common Equity Tier One Capital Ratio | 13.63% | 12.95%
Common Equity Tier One Capital Required for Capital Adequacy | $ 573,699 | $ 538,178
Total capital (to risk-weighted assets), Amount |  |
Total Capital, Actual | 1,830,385 | 1,633,778
Total Capital, Required For Capital Adequacy Purposes | 1,019,910 | 956,761
Required To Be Well Capitalized under Prompt Corrective Action Provisions | $ 1,274,887 | $ 1,195,951
Capital Required to be Well Capitalized to Risk Weighted Assets | 10.00% | 10.00%
Tier I capital (to risk-weighted assets), Amount |  |
Tier I Capital, Actual (Risk Based) | $ 1,737,092 | $ 1,548,401
Tier One Risk Based Capital Required for Capital Adequacy | 764,932 | 717,571
Tier I Capital, Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Risk Based) | 1,019,910 | 956,761
Tier I capital (to average assets), Amount |  |
Tier I Capital, Actual (Leverage) | 1,737,092 | 1,548,401
Tier I Capital, Required For Capital Adequacy Purposes | 590,639 | 543,441
Tier I Capital, Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Leverage) | $ 738,299 | $ 679,301
Total capital and Tier I capital (to risk-weighted assets), Ratio |  |
Total Capital (to Risk Weighted Assets), Actual | 14.36% | 13.66%
Total Capital (to Risk Weighted Assets), Minimum For Capital Adequacy Purposes | 8.00% | 8.00%
Tier I Capital (to Risk Weighted Assets), Actual (Risk Based) | 13.63% | 12.95%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 6.00% | 6.00%
Tier I Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Risk Based) | 8.00% | 8.00%
Common Equity Tier One Capital Required to be Well-Capitalized | $ 828,677 | $ 777,368
Tier I capital (to average assets), Ratio |  |
Tier I Capital (to Average Assets), Actual (Leverage) | 11.76% | 11.40%
Tier I Capital (to Average Assets), Minimum For Capital Adequacy Purposes (Leverage) | 4.00% | 4.00%
Tier I Capital (to Average Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Leverage) | 5.00% | 5.00%
Common equity tier 1 capital [Member] | Parent Company |  |
Total capital and Tier I capital (to risk-weighted assets), Ratio |  |
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 4.50% | 4.50%
Common equity tier 1 capital [Member] | Bank |  |
Total capital and Tier I capital (to risk-weighted assets), Ratio |  |
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 4.50% | 4.50%
Tier I Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Risk Based) | 6.50% | 6.50%
Common Equity Tier 1 [Member] | Parent Company |  |
Total capital and Tier I capital (to risk-weighted assets), Ratio |  |
Tier One Required for Capital Adequacy with Capital Buffer | $ 812,774 | $ 688,000
Tier One Required for Capital Adequacy with Capital Buffer to Risk Weighted Assets | 6.375% | 5.75%
Common Equity Tier 1 [Member] | Subsidiaries [Member] |  |
Total capital and Tier I capital (to risk-weighted assets), Ratio |  |
Tier One Required for Capital Adequacy with Capital Buffer | $ 812,740 | $ 687,672
Tier One Required for Capital Adequacy with Capital Buffer to Risk Weighted Assets | 6.375% | 5.75%

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