Regulatory Matters (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Company
Total capital (to risk-weighted assets), Amount
Total Capital, Actual	$ 1,591,852,000	$ 1,578,690,000
Total Capital, Required For Capital Adequacy Purposes	925,708,000	926,076,000
Required for Capital Adequacy with Capital Buffer	1,070,350,000	998,425,000
Tier I capital (to risk-weighted assets), Amount
Tier I Capital, Actual (Risk Based)	1,509,758,000	1,496,153,000
Tier I Capital, Required For Capital Adequacy Purposes	694,281,000	694,557,000
Tier 1 Capital, Required for Capital Adequacy with Capital Buffer	838,923,000	766,906,000
Tier I capital (to average assets), Amount
Tier I Capital, Actual (Leverage)	1,509,758,000	1,496,153,000
Tier I Capital, Required For Capital Adequacy Purposes	$ 515,352,000	$ 520,947,000
Total capital and Tier I capital (to risk-weighted assets), Ratio
Total Capital (to Risk Weighted Assets), Actual	13.76%	13.64%
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	9.25%	8.63%
Tier I Capital (to Risk Weighted Assets), Actual (Risk Based)	13.05%	12.92%
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	7.25%	6.625%
Tier I capital (to average assets), Ratio
Tier I Capital (to Average Assets), Actual (Leverage)	11.72%	11.49%
Tier I Capital (to Average Assets), Minimum For Capital Adequacy Purposes (Leverage)	4.00%	4.00%
Bank
Total capital (to risk-weighted assets), Amount
Total Capital, Actual	$ 1,571,333,000	$ 1,557,765,000
Total Capital, Required For Capital Adequacy Purposes	925,199,000	925,566,000
Required for Capital Adequacy with Capital Buffer	1,069,762,000	997,876,000
Required To Be Well Capitalized under Prompt Corrective Action Provisions	1,156,499,000	1,156,957,000
Tier I capital (to risk-weighted assets), Amount
Tier I Capital, Actual (Risk Based)	1,489,239,000	1,475,228,000
Tier I Capital, Required For Capital Adequacy Purposes	693,899,000	694,174,000
Tier 1 Capital, Required for Capital Adequacy with Capital Buffer	838,462,000	766,484,000
Tier I Capital, Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Risk Based)	925,199,000	925,566,000
Tier I capital (to average assets), Amount
Tier I Capital, Actual (Leverage)	1,489,239,000	1,475,228,000
Tier I Capital, Required For Capital Adequacy Purposes	515,212,000	520,903,000
Tier I Capital, Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Leverage)	$ 644,014,000	$ 651,129,000
Total capital and Tier I capital (to risk-weighted assets), Ratio
Total Capital (to Risk Weighted Assets), Actual	13.59%	13.46%
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	9.25%	8.63%
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)	12.88%	12.75%
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	7.25%	6.625%
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)	11.56%	11.33%
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 [Member] \| Company
Tier I capital (to risk-weighted assets), Amount
Tier I Capital, Actual (Risk Based)	$ 1,413,592,000	$ 1,400,246,000
Tier I Capital, Required For Capital Adequacy Purposes	520,711,000	520,917,000
Tier 1 Capital, Required for Capital Adequacy with Capital Buffer	$ 665,353,000	$ 593,267,000
Total capital and Tier I capital (to risk-weighted assets), Ratio
Tier I Capital (to Risk Weighted Assets), Actual (Risk Based)	12.22%	12.10%
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	5.75%	5.125%
Common Equity Tier 1 [Member] \| Bank
Tier I capital (to risk-weighted assets), Amount
Tier I Capital, Actual (Risk Based)	$ 1,489,239,000	$ 1,475,228,000
Tier I Capital, Required For Capital Adequacy Purposes	520,425,000	520,630,740.0000
Tier 1 Capital, Required for Capital Adequacy with Capital Buffer	664,987,000	592,941,000
Tier I Capital, Minimum to be Well Capitalized Under Prompt Corrective Action Provisions (Risk Based)	$ 751,724,437.4900	$ 752,022,180.0000
Total capital and Tier I capital (to risk-weighted assets), Ratio
Tier I Capital (to Risk Weighted Assets), Actual (Risk Based)	12.88%	12.75%
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	5.75%	5.125%
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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The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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Total Capital divided by risk weighted assets as defined in the regulations.

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The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations.

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Tier 1 Risk Based Capital as defined in the regulations.

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The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action.

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Tier 1 capital divided by risk weighted assets as defined by regulations.

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