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Regulatory Capital - Well Capitalized Regulatory Requirements (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Actual |  |
Common Equity Tier I Capital (to Risk-Weighted Assets) | $ 1,928,979 | $ 1,734,315
Tier 1 Capital (to Risk-Weighted Assets) | 1,928,979 | 1,734,315
Total Capital (to Risk-Weighted Assets) | 2,095,397 | 1,848,528
Tier 1 Capital (to Average Assets) | $ 1,928,979 | $ 1,734,315
Actual Ratio |  |
Common Equity Tier I Capital (to Risk-Weighted Assets) | 12.40% | 14.40%
Tier 1 Capital (to Risk-Weighted Assets) | 12.40% | 14.40%
Total Capital (to Risk-Weighted Assets) | 13.40% | 15.40%
Tier 1 Capital (to Average Assets) | 11.60% | 12.30%
Well Capitalized Regulatory Requirements, Amount |  |
Common Equity Tier I Capital (to Risk-Weighted Assets) | $ 1,012,748 | $ 781,638
Tier 1 Capital (to Risk-Weighted Assets) | 1,246,459 | 962,017
Total Capital (to Risk-Weighted Assets) | 1,558,074 | 1,202,521
Tier 1 Capital (to Average Assets) | $ 828,962 | $ 704,979
Well Capitalized Regulatory Requirements, Ratio |  |
Common Equity Tier I Capital (to Risk-Weighted Assets) | 6.50% | 6.50%
Tier 1 Capital (to Risk-Weighted Assets) | 8.00% | 8.00%
Total Capital (to Risk-Weighted Assets) | 10.00% | 10.00%
Tier 1 Capital (to Average Assets) | 5.00% | 5.00%

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- Definition The amount of total capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998 + Details
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- Definition The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition The amount of Tier 1 Leverage Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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- Definition Tier 1 Risk Based Capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 + Details
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