Regulatory Matters (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Company
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital	$ 1,512,921	$ 1,458,344
Common Equity Tier One Capital Ratio	11.90%	11.44%
Total capital (to risk-weighted assets), Amount
Total Capital, Actual	$ 1,706,299	$ 1,649,664
Total Capital, Required For Capital Adequacy Purposes	1,017,255	1,019,952
Required for Capital Adequacy with Capital Buffer	1,335,147	1,259,004
Tier I capital (to risk-weighted assets), Amount
Tier I Capital, Actual (Risk Based)	1,611,497	1,556,371
Tier I Capital, Required For Capital Adequacy Purposes	762,941	764,964
Tier 1 Capital, Required for Capital Adequacy with Capital Buffer	1,080,833	1,004,015
Tier I capital (to average assets), Amount
Tier I Capital, Actual (Leverage)	1,611,497	1,556,371
Tier I Capital, Required For Capital Adequacy Purposes	$ 589,066	$ 590,176
Total capital and Tier I capital (to risk-weighted assets), Ratio
Total Capital (to Risk Weighted Assets), Actual	13.42%	12.94%
Total Capital (to Risk Weighted Assets), Minimum For Capital Adequacy Purposes	8.00%	8.00%
Total Capital (to Risk Weighted assets), Minimum Required for Capital Adequacy with Capital Buffer	10.50%	9.875%
Tier I Capital (to Risk Weighted Assets), Actual (Risk Based)	12.67%	12.21%
Tier I Capital (to Risk Weighted Assets), Minimum For Capital Adequacy Purposes (Risk Based)	6.00%	6.00%
Tier 1 Capital (to Risk Weighted Assets), Minimum Required for Capital Adequacy with Capital Buffer	8.50%	7.875%
Tier I capital (to average assets), Ratio
Tier I Capital (to Average Assets), Actual (Leverage)	10.94%	10.55%
Tier I Capital (to Average Assets), Minimum For Capital Adequacy Purposes (Leverage)	4.00%	4.00%
Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier One Capital	$ 1,784,216	$ 1,737,092
Common Equity Tier One Capital Ratio	14.03%	13.63%
Total capital (to risk-weighted assets), Amount
Total Capital, Actual	$ 1,879,018	$ 1,830,385
Total Capital, Required For Capital Adequacy Purposes	1,017,134	1,019,910
Required for Capital Adequacy with Capital Buffer	1,334,988	1,258,951
Required To Be Well Capitalized under Prompt Corrective Action Provisions	1,271,417	1,274,887
Tier I capital (to risk-weighted assets), Amount
Tier I Capital, Actual (Risk Based)	1,784,216	1,737,092
Tier I Capital, Required For Capital Adequacy Purposes	762,850	764,932
Tier 1 Capital, Required for Capital Adequacy with Capital Buffer	889,992	812,740
Tier I Capital, Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Risk Based)	1,017,134	1,019,910
Tier I capital (to average assets), Amount
Tier I Capital, Actual (Leverage)	1,784,216	1,737,092
Tier I Capital, Required For Capital Adequacy Purposes	589,225	590,639
Tier I Capital, Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Leverage)	$ 736,532	$ 738,299
Total capital and Tier I capital (to risk-weighted assets), Ratio
Total Capital (to Risk Weighted Assets), Actual	14.78%	14.36%
Total Capital (to Risk Weighted Assets), Minimum For Capital Adequacy Purposes	8.00%	8.00%
Total Capital (to Risk Weighted assets), Minimum Required for Capital Adequacy with Capital Buffer	10.50%	9.875%
Total Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions	10.00%	10.00%
Tier I Capital (to Risk Weighted Assets), Actual (Risk Based)	14.03%	13.63%
Tier I Capital (to Risk Weighted Assets), Minimum For Capital Adequacy Purposes (Risk Based)	6.00%	6.00%
Tier 1 Capital (to Risk Weighted Assets), Minimum Required for Capital Adequacy with Capital Buffer	8.50%	7.875%
Common Equity Tier One Capital Required to be Well-Capitalized	$ 826,421	$ 828,677
Tier I Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Risk Based)	8.00%	8.00%
Tier I capital (to average assets), Ratio
Tier I Capital (to Average Assets), Actual (Leverage)	12.11%	11.76%
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 \| Company
Tier I capital (to risk-weighted assets), Amount
Tier I Capital, Required For Capital Adequacy Purposes	$ 572,206	$ 573,723
Tier 1 Capital, Required for Capital Adequacy with Capital Buffer	$ 890,098	$ 812,774
Total capital and Tier I capital (to risk-weighted assets), Ratio
Tier I Capital (to Risk Weighted Assets), Minimum For Capital Adequacy Purposes (Risk Based)	4.50%	4.50%
Tier 1 Capital (to Risk Weighted Assets), Minimum Required for Capital Adequacy with Capital Buffer	7.00%	6.375%
Common Equity Tier 1 \| Bank
Tier I capital (to risk-weighted assets), Amount
Tier I Capital, Required For Capital Adequacy Purposes	$ 572,138	$ 573,669
Tier 1 Capital, Required for Capital Adequacy with Capital Buffer	$ 889,992	$ 812,740
Total capital and Tier I capital (to risk-weighted assets), Ratio
Tier I Capital (to Risk Weighted Assets), Minimum For Capital Adequacy Purposes (Risk Based)	4.50%	4.50%
Tier 1 Capital (to Risk Weighted Assets), Minimum Required for Capital Adequacy with Capital Buffer	7.00%	6.375%
Tier I Capital (to Risk Weighted Assets), Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Risk Based)	6.50%	6.50%

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The amount of total capital as defined in the regulations.

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Amount of Common Equity Tier One Risk-based Capital, as defined by regulatory framework.

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