Regulatory Matters (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
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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The amount of total capital as defined in the regulations.

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Amount of Common Equity Tier 1 Risk-based Capital required to be categorized as adequately capitalized under regulatory framework for prompt corrective action.

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Tier 1 Risk Based Capital as defined in the regulations.

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