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Note 14 - Regulatory Capital - Summary of the Bank's Compliance (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Savings Bank [Member] |  |
Tier I (leverage) capital: |  |
Tier i (leverage) capital, capital level, amount | $ 631,285 | $ 607,033
Tier i (leverage) capital, capital level, percent | 10.11% | 10.12%
Tier i (leverage) capital, requirement to be well capitalized, amount | $ 312,343 | $ 299,848
Tier i (leverage) capital, requirement to be well capitalized, percent | 5.00% | 5.00%
Tier i (leverage) capital, excess, amount | $ 318,942 | $ 307,185
Tier i (leverage) capital, excess, percent | 5.11% | 5.12%
Common Equity Tier I risk-based capital: |  |
Common equity tier i risk-based capital, capital level, amount | $ 631,285 | $ 607,033
Common equity tier i risk-based capital, capital level, percent | 13.87% | 14.12%
Common equity tier i risk-based capital, requirement to be well capitalized, amount | $ 295,937 | $ 279,443
Common equity tier i risk-based capital, requirement to be well capitalized, percent | 6.50% | 6.50%
Common equity tier i risk-based capital, excess, amount | $ 335,348 | $ 327,590
Common equity tier i risk-based capital, excess, percent | 7.37% | 7.62%
Tier I risk-based capital: |  |
Tier 1 risk-based capital, capital level, amount | $ 631,285 | $ 607,033
Tier 1 risk-based capital, capital level, percent | 13.87% | 14.12%
Tier 1 risk-based capital, requirement to be well capitalized, amount | $ 364,230 | $ 343,930
Tier 1 risk-based capital, requirement to be well capitalized, percent | 8.00% | 8.00%
Tier 1 risk-based capital, excess, amount | $ 267,055 | $ 263,103
Tier 1 risk-based capital, excess, percent | 5.87% | 6.12%
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 651,636 | $ 629,262
Total risk-based capital, capital level, percent | 14.31% | 14.64%
Total risk-based capital, requirement to be well capitalized, amount | $ 455,288 | $ 429,913
Total risk-based capital, requirement to be well capitalized, percent | 10.00% | 10.00%
Total risk-based capital, excess, amount | $ 196,348 | $ 199,349
Total risk-based capital, excess, percent | 4.31% | 4.64%
Holding Company [Member] |  |
Tier I (leverage) capital: |  |
Tier i (leverage) capital, capital level, amount | $ 563,426 | $ 539,228
Tier i (leverage) capital, capital level, percent | 9.02% | 9.00%
Tier i (leverage) capital, requirement to be well capitalized, amount | $ 312,278 | $ 299,654
Tier i (leverage) capital, requirement to be well capitalized, percent | 5.00% | 5.00%
Tier i (leverage) capital, excess, amount | $ 251,148 | $ 239,574
Tier i (leverage) capital, excess, percent | 4.02% | 4.00%
Common Equity Tier I risk-based capital: |  |
Common equity tier i risk-based capital, capital level, amount | $ 527,727 | $ 506,432
Common equity tier i risk-based capital, capital level, percent | 11.59% | 11.79%
Common equity tier i risk-based capital, requirement to be well capitalized, amount | $ 295,865 | $ 279,121
Common equity tier i risk-based capital, requirement to be well capitalized, percent | 6.50% | 6.50%
Common equity tier i risk-based capital, excess, amount | $ 231,862 | $ 227,311
Common equity tier i risk-based capital, excess, percent | 5.09% | 5.29%
Tier I risk-based capital: |  |
Tier 1 risk-based capital, capital level, amount | $ 563,426 | $ 539,228
Tier 1 risk-based capital, capital level, percent | 12.38% | 12.56%
Tier 1 risk-based capital, requirement to be well capitalized, amount | $ 364,141 | $ 343,534
Tier 1 risk-based capital, requirement to be well capitalized, percent | 8.00% | 8.00%
Tier 1 risk-based capital, excess, amount | $ 199,285 | $ 195,694
Tier 1 risk-based capital, excess, percent | 4.38% | 4.56%
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 658,777 | $ 636,457
Total risk-based capital, capital level, percent | 14.47% | 14.82%
Total risk-based capital, requirement to be well capitalized, amount | $ 455,177 | $ 429,417
Total risk-based capital, requirement to be well capitalized, percent | 10.00% | 10.00%
Total risk-based capital, excess, amount | $ 203,600 | $ 207,040
Total risk-based capital, excess, percent | 4.47% | 4.82%

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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=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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&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=84167132&loc=SL5958568-112826 + Details
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- Definition The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in 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=84167132&loc=SL5958568-112826 + Details
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- Definition Total Capital divided by risk weighted 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 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 2: 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 + Details
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- Definition Amount of Common Equity Tier 1 Risk-based Capital required to be categorized as well-capitalized under regulatory framework for prompt corrective action. + References No definition available. + Details
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- Definition The amount by which the company's Total Capital exceeds the minimum required for capital adequacy purposes. + 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=84167132&loc=SL5958568-112826 + Details
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- Definition The amount of excess Total Capital divided by risk weighted assets which are assets that are weighted for credit risk according to a formula used by the Reserve Bank. + References Reference 1: 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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- Definition The amount by which the company's Tier 1 Leverage Capital exceeds the minimum required for capital adequacy purposes. + 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=84167132&loc=SL5958568-112826 + Details
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- Definition The amount of excess Tier 1 Leverage Capital 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 -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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- Definition The amount by which the company's Tier 1 Risk Based Capital exceeds the minimum required for capital adequacy purposes. + 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=84167132&loc=SL5958568-112826 + Details
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- Definition The amount of excess Tier 1 Risk Based Capital (which consists of the types of financial capital considered the most reliable and liquid, primarily Shareholders' equity. Examples of Tier 1 capital are common stock or unit, preferred stock or unit that is irredeemable and noncumulative, and retained earnings) divided by risk-weighted assets which are assets that are weighted for credit risk according to a formula used by the Reserve Bank. + 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=84167132&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=84167132&loc=SL5958568-112826 + Details
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- Definition The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in 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=84167132&loc=SL5958568-112826 + Details
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- Definition Tier 1 Leverage Capital 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 + 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=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 + Details
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- Definition The amount of Tier 1 Risk Based 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=84167132&loc=SL5958568-112826 + Details
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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) 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=84167132&loc=SL5958568-112826 + Details
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- Definition Tier 1 capital divided by risk weighted assets as defined by 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 + Details
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