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Actual Capital Amounts and Ratios for Community Bank in Comparison to Minimum Amounts and Ratios Required (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Common Equity, Tier 1 Amount |  |
Total regulatory capital, Common Equity, Tier 1 Amount | $ 3,869,129 | $ 3,748,231
Minimum for capital adequacy purposes, Common Equity, Tier 1 Amount | 1,532,448 | 1,588,699
Excess, Common Equity, Tier 1 Amount | $ 2,336,681 | $ 2,159,532
Total regulatory capital, Leverage Capital, Ratio | 9.58% | 8.00%
Common Equity, Tier 1 Ratio |  |
Total regulatory capital, Common Equity, Tier 1 Ratio | 11.36% | 10.62%
Minimum for capital adequacy purposes, Common Equity, Tier 1 Ratio | 4.50% | 4.50%
Excess, Common Equity, Tier 1 Ratio | 6.86% | 6.12%
Leverage Capital, Amount |  |
Total regulatory capital, Leverage Capital, Amount | $ 4,371,969 | $ 3,748,231
Minimum for capital adequacy purposes, Leverage Capital, Amount | 1,826,141 | 1,875,062
Excess, Leverage Capital, Amount | $ 2,545,828 | $ 1,873,169
Minimum for capital adequacy purposes, Leverage Capital, Ratio | 4.00% | 4.00%
Leverage Capital, Ratio |  |
Total regulatory capital, Leverage Capital, Ratio | 9.58% | 8.00%
Minimum for capital adequacy purposes, Leverage Capital, Ratio | 4.00% | 4.00%
Excess, Leverage Capital, Ratio | 5.58% | 4.00%
Excess, Leverage Capital, Ratio | 5.58% | 4.00%
Risk-Based Capital, Tier 1 Amount |  |
Total regulatory capital, Risk-Based Capital, Tier 1 Amount | $ 4,371,969 | $ 3,748,231
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Amount | 2,043,265 | 2,118,266
Excess, Risk-Based Capital, Tier 1 Amount | $ 2,328,704 | $ 1,629,965
Risk-Based Capital, Tier 1 Ratio |  |
Total regulatory capital, Risk-Based Capital, Tier 1 Ratio | 12.84% | 10.62%
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Ratio | 6.00% | 6.00%
Excess, Risk-Based Capital, Tier 1 Ratio | 6.84% | 4.62%
Risk-Based Capital, Total Amount |  |
Total regulatory capital, Risk-Based Capital, Total Amount | $ 4,877,208 | $ 4,277,759
Minimum for capital adequacy purposes, Risk-Based Capital, Total Amount | 2,724,353 | 2,824,355
Excess, Risk-Based Capital, Total Amount | $ 2,152,855 | $ 1,453,404
Risk-Based Capital, Total Ratio |  |
Total regulatory capital, Risk-Based Capital, Total Ratio | 14.32% | 12.12%
Minimum for capital adequacy purposes, Risk-Based Capital, Total Ratio | 8.00% | 8.00%
Excess, Risk-Based Capital, Total Ratio | 6.32% | 4.12%
New York Community Bank |  |
Common Equity, Tier 1 Amount |  |
Total regulatory capital, Common Equity, Tier 1 Amount | $ 4,253,233 | $ 3,686,510
Minimum for capital adequacy purposes, Common Equity, Tier 1 Amount | 1,424,795 | 1,477,056
Excess, Common Equity, Tier 1 Amount | $ 2,828,438 | $ 2,209,454
Total regulatory capital, Leverage Capital, Ratio | 10.06% | 8.45%
Common Equity, Tier 1 Ratio |  |
Total regulatory capital, Common Equity, Tier 1 Ratio | 13.43% | 11.23%
Minimum for capital adequacy purposes, Common Equity, Tier 1 Ratio | 4.50% | 4.50%
Excess, Common Equity, Tier 1 Ratio | 8.93% | 6.73%
Leverage Capital, Amount |  |
Total regulatory capital, Leverage Capital, Amount | $ 4,253,233 | $ 3,686,510
Minimum for capital adequacy purposes, Leverage Capital, Amount | 1,691,041 | 1,744,601
Excess, Leverage Capital, Amount | $ 2,562,192 | $ 1,941,909
Minimum for capital adequacy purposes, Leverage Capital, Ratio | 4.00% | 4.00%
Leverage Capital, Ratio |  |
Total regulatory capital, Leverage Capital, Ratio | 10.06% | 8.45%
Minimum for capital adequacy purposes, Leverage Capital, Ratio | 4.00% | 4.00%
Excess, Leverage Capital, Ratio | 6.06% | 4.45%
Excess, Leverage Capital, Ratio | 6.06% | 4.45%
Risk-Based Capital, Tier 1 Amount |  |
Total regulatory capital, Risk-Based Capital, Tier 1 Amount | $ 4,253,233 | $ 3,686,510
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Amount | 1,899,727 | 1,969,408
Excess, Risk-Based Capital, Tier 1 Amount | $ 2,353,506 | $ 1,717,102
Risk-Based Capital, Tier 1 Ratio |  |
Total regulatory capital, Risk-Based Capital, Tier 1 Ratio | 13.43% | 11.23%
Minimum for capital adequacy purposes, Risk-Based Capital, Tier 1 Ratio | 6.00% | 6.00%
Excess, Risk-Based Capital, Tier 1 Ratio | 7.43% | 5.23%
Risk-Based Capital, Total Amount |  |
Total regulatory capital, Risk-Based Capital, Total Amount | $ 4,387,620 | $ 3,843,382
Minimum for capital adequacy purposes, Risk-Based Capital, Total Amount | 2,532,969 | 2,625,877
Excess, Risk-Based Capital, Total Amount | $ 1,854,651 | $ 1,217,505
Risk-Based Capital, Total Ratio |  |
Total regulatory capital, Risk-Based Capital, Total Ratio | 13.86% | 11.71%
Minimum for capital adequacy purposes, Risk-Based Capital, Total Ratio | 8.00% | 8.00%
Excess, Risk-Based Capital, Total Ratio | 5.86% | 3.71%

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- Definition The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets 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=84167132&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=84167132&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 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 + Details
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