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Regulatory Capital Requirements | 12 Months Ended
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Dec. 31, 2017
Banking and Thrift [Abstract] |
Regulatory Capital Requirements | Regulatory Capital Requirements FDIC regulations require banks to maintain minimum levels of regulatory capital. Under the regulations in effect at December 31, 2017, the Bank is required to maintain: (1) a Tier 1 capital to total assets leverage ratio of 4.0%; (2) a common equity Tier 1 capital to risk-based assets ratio of 4.5%; (3) a Tier 1 capital to risk-based assets ratio of 6.0%; and (4) a total capital to risk-based assets ratio of 8.0%. In addition to establishing the minimum regulatory capital requirements, the regulations limit capital distributions and certain discretionary bonus payments to management if the institution does not hold a “capital conservation buffer” consisting of 2.5% of common equity Tier 1 capital to risk-weighted asset above the amount necessary to meet its minimum risk-based capital requirements. The capital conservation buffer requirement was effective on January 1, 2016 at 0.625% of risk-weighted assets and will increase each year until fully implemented at 2.5% on January 1, 2019. The capital conservation buffer during the calendar year 2017 was 1.25% and increased to 1.875% on January 1, 2018. Under its prompt corrective action regulations, the FDIC is required to take certain supervisory actions (and may take additional discretionary actions) with respect to an undercapitalized institution. Such actions could have a direct material effect on an institution’s financial statements. The regulations establish a framework for the classification of savings institutions into five categories: well capitalized, adequately capitalized, undercapitalized, significantly undercapitalized, and critically undercapitalized. Generally, an institution is considered well capitalized if it has: a leverage (Tier 1) capital ratio of at least 5.00%; a common equity Tier 1 risk-based capital ratio of 6.50%; a Tier 1 risk-based capital ratio of at least 8.00%; and a total risk-based capital ratio of at least 10.00%. The foregoing capital ratios are based in part on specific quantitative measures of assets, liabilities and certain off-balance sheet items as calculated under regulatory accounting practices. Capital amounts and classifications are also subject to qualitative judgments by the FDIC about capital components, risk weightings and other factors. As of December 31, 2017 and 2016, the Bank exceeded all minimum capital adequacy requirements to which it is subject. Further, the most recent FDIC notification categorized the Bank as a well-capitalized institution under the prompt corrective action regulations. There have been no conditions or events since that notification that management believes have changed the Bank’s capital classification. The Company is regulated as a bank holding company, and as such, is subject to examination, regulation and periodic reporting under the Bank Holding Company Act, as administered by the Federal Reserve Board (“FRB”). The FRB has adopted capital adequacy guidelines for bank holding companies on a consolidated basis substantially similar to those of the FDIC for the Bank. As of December 31, 2017 and 2016, the Company was “well capitalized” under FRB guidelines. Regulations of the FRB provide that a bank holding company must serve as a source of strength to any of its subsidiary banks and must not conduct its activities in an unsafe or unsound manner. Under the prompt corrective action provisions discussed above, a bank holding company parent of an undercapitalized subsidiary bank would be directed to guarantee, within limitations, the capital restoration plan that is required of such an undercapitalized bank. If the undercapitalized bank fails to file an acceptable capital restoration plan or fails to implement an accepted plan, the FRB may prohibit the bank holding company parent of the undercapitalized bank from paying any dividend or making any other form of capital distribution without the prior approval of the FRB. The following table shows the Company’s actual capital amounts and ratios as of December 31, 2017 and 2016, compared to the FRB minimum capital adequacy requirements and the FRB requirements for classification as a well-capitalized institution (dollars in thousands).
| Actual capital |  | FRB minimum capital adequacy requirements |  | FRB minimum capital adequacy requirements with capital conservation buffer |  | To be well-capitalized under prompt corrective action provisions
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
As of December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 leverage capital | $ | 887,924 |  |  | 9.65 | % |  | $ | 367,999 |  |  | 4.00 | % |  | $ | 367,999 |  |  | 4.00 | % |  | $ | 459,999 |  |  | 5.00 | %
Common equity Tier 1 risk-based capital | 887,924 |  |  | 11.87 |  |  | 336,736 |  |  | 4.50 | % |  | 430,260 |  |  | 5.75 |  |  | 486,381 |  |  | 6.50 |
Tier 1 risk-based capital | 887,924 |  |  | 11.87 |  |  | 448,981 |  |  | 6.00 | % |  | 542,502 |  |  | 7.25 |  |  | 598,623 |  |  | 8.00 |
Total risk-based capital | 948,119 |  |  | 12.67 |  |  | 598,642 |  |  | 8.00 | % |  | 692,157 |  |  | 9.25 |  |  | 748,278 |  |  | 10.00 |
| Actual capital |  | FRB minimum capital adequacy requirements |  | FRB minimum capital adequacy requirements with capital conservation buffer |  | To be well-capitalized under prompt corrective action provisions
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 leverage capital | $ | 835,282 |  |  | 9.25 | % |  | $ | 361,183 |  |  | 4.00 | % |  | $ | 361,183 |  |  | 4.00 | % |  | $ | 451,479 |  |  | 5.00 | %
Common equity Tier 1 risk-based capital | 835,282 |  |  | 11.64 |  |  | 323,048 |  |  | 4.50 |  |  | 367,916 |  |  | 5.13 | % |  | 466,625 |  |  | 6.50 |
Tier 1 risk-based capital | 835,282 |  |  | 11.64 |  |  | 430,731 |  |  | 6.00 |  |  | 475,599 |  |  | 6.63 | % |  | 574,308 |  |  | 8.00 |
Total risk-based capital | 897,165 |  |  | 12.50 |  |  | 574,308 |  |  | 8.00 |  |  | 619,176 |  |  | 8.63 | % |  | 717,885 |  |  | 10.00 |
The following table shows the Bank’s actual capital amounts and ratios as of December 31, 2017 and 2016, compared to the FDIC minimum capital adequacy requirements and the FDIC requirements for classification as a well-capitalized institution (dollars in thousands).
| Actual capital |  | FDIC minimum capital adequacy requirements |  | FDIC minimum capital adequacy requirements with Capital Conservation buffer |  | To be well-capitalized under prompt corrective action provisions
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
As of December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 leverage capital | $ | 834,084 |  |  | 9.07 | % |  | $ | 367,986 |  |  | 4.00 | % |  | $ | 367,986 |  |  | 4.00 | % |  | $ | 459,983 |  |  | 5.00 | %
Common equity Tier 1 risk-based capital | 834,084 |  |  | 11.15 |  |  | 336,721 |  |  | 4.50 | % |  | 430,254 |  |  | 5.75 |  |  | 486,374 |  |  | 6.50 |
Tier 1 risk-based capital | 834,084 |  |  | 11.15 |  |  | 448,961 |  |  | 6.00 | % |  | 542,494 |  |  | 7.25 |  |  | 598,615 |  |  | 8.00 |
Total risk-based capital | 894,430 |  |  | 11.95 |  |  | 598,615 |  |  | 8.00 | % |  | 692,148 |  |  | 9.25 |  |  | 748,268 |  |  | 10.00 |
| Actual capital |  | FDIC minimum capital adequacy requirements |  | FRB minimum capital adequacy requirements with capital conservation buffer |  | To be well-capitalized under prompt corrective action provisions
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 leverage capital | $ | 760,708 |  |  | 8.42 | % |  | $ | 361,172 |  |  | 4.00 | % |  | $ | 361,172 |  |  | 4.00 | % |  | $ | 451,465 |  |  | 5.00 | %
Common equity Tier 1 risk-based capital | 760,708 |  |  | 10.60 |  |  | 323,040 |  |  | 4.50 |  |  | 367,907 |  |  | 5.13 | % |  | 466,613 |  |  | 6.50 |
Tier 1 risk-based capital | 760,708 |  |  | 10.60 |  |  | 430,720 |  |  | 6.00 |  |  | 475,587 |  |  | 6.63 | % |  | 574,293 |  |  | 8.00 |
Total risk-based capital | 822,743 |  |  | 11.46 |  |  | 574,293 |  |  | 8.00 |  |  | 619,160 |  |  | 8.63 | % |  | 717,867 |  |  | 10.00 |

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- Definition The entire disclosure for banks, savings institutions, and credit unions, for regulatory capital requirements imposed by the Federal Reserve System (FRB), the Federal Deposit Insurance Corporation (FDIC), the Office of Thrift Supervision (OTS) or for any state imposed capital requirements, as applicable. The disclosure may include (1) a description of regulatory capital requirements (a) for capital adequacy purposes and (b) established by the prompt corrective action provisions of Section 38 of the Federal Depository Insurance Act; (2) the actual or possible material effects of noncompliance with such requirements; (3) whether the entity is in compliance with the regulatory capital requirements including (a) required and actual ratios and amounts of Tier 1 leverage, Tier 1 risk-based, and total risk-based capital, tangible capital (for savings institutions), and Tier 3 capital for market risk (for certain banks and bank holding companies), (b) factors that may significantly affect capital adequacy; (4) the prompt corrective action category in which the entity was classified as of its most recent notification; (5) whether management believes any conditions or events since notification have changed the entity's category. Also may include additional information that might be disclosed in situations where substantial doubt about the entity's ability to continue as a going concern for a reasonable period of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1C -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958572-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1E -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958574-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958569-112826 Reference 6: 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 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1F -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958575-112826 Reference 8: 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=84167132&loc=SL5958568-112826 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1D -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958573-112826 + Details
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