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Note 14 - Regulatory Capital - Summary of the Bank's Compliance (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Savings Bank [Member] |  |
Tier I (leverage) capital: |  |
Tier i (leverage) capital, capital level, amount | $ 660,782 | $ 631,285
Tier i (leverage) capital, capital level, percent | 9.85% | 10.11%
Tier i (leverage) capital, requirement to be well capitalized, amount | $ 335,512 | $ 312,343
Tier i (leverage) capital, requirement to be well capitalized, percent | 5.00% | 5.00%
Tier i (leverage) capital, excess, amount | $ 325,270 | $ 318,942
Tier i (leverage) capital, excess, percent | 4.85% | 5.11%
Common Equity Tier I risk-based capital: |  |
Common equity tier i risk-based capital, capital level, amount | $ 660,782 | $ 631,285
Common equity tier i risk-based capital, capital level, percent | 13.28% | 13.87%
Common equity tier i risk-based capital, requirement to be well capitalized, amount | $ 323,386 | $ 295,937
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 | $ 337,396 | $ 335,348
Common equity tier i risk-based capital, excess, percent | 6.78% | 7.37%
Tier I risk-based capital: |  |
Tier 1 risk-based capital, capital level, amount | $ 660,782 | $ 631,285
Tier 1 risk-based capital, capital level, percent | 13.28% | 13.87%
Tier 1 risk-based capital, requirement to be well capitalized, amount | $ 398,014 | $ 364,230
Tier 1 risk-based capital, requirement to be well capitalized, percent | 8.00% | 8.00%
Tier 1 risk-based capital, excess, amount | $ 262,768 | $ 267,055
Tier 1 risk-based capital, excess, percent | 5.28% | 5.87%
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 681,727 | $ 651,636
Total risk-based capital, capital level, percent | 13.70% | 14.31%
Total risk-based capital, requirement to be well capitalized, amount | $ 497,517 | $ 455,288
Total risk-based capital, requirement to be well capitalized, percent | 10.00% | 10.00%
Total risk-based capital, excess, amount | $ 184,210 | $ 196,348
Total risk-based capital, excess, percent | 3.70% | 4.31%
Holding Company [Member] |  |
Tier I (leverage) capital: |  |
Tier i (leverage) capital, capital level, amount | $ 586,582 | $ 563,426
Tier i (leverage) capital, capital level, percent | 8.74% | 9.02%
Tier i (leverage) capital, requirement to be well capitalized, amount | $ 335,616 | $ 312,278
Tier i (leverage) capital, requirement to be well capitalized, percent | 5.00% | 5.00%
Tier i (leverage) capital, excess, amount | $ 250,966 | $ 251,148
Tier i (leverage) capital, excess, percent | 3.74% | 4.02%
Common Equity Tier I risk-based capital: |  |
Common equity tier i risk-based capital, capital level, amount | $ 546,230 | $ 527,727
Common equity tier i risk-based capital, capital level, percent | 10.98% | 11.59%
Common equity tier i risk-based capital, requirement to be well capitalized, amount | $ 323,382 | $ 295,865
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 | $ 222,848 | $ 231,862
Common equity tier i risk-based capital, excess, percent | 4.48% | 5.09%
Tier I risk-based capital: |  |
Tier 1 risk-based capital, capital level, amount | $ 586,582 | $ 563,426
Tier 1 risk-based capital, capital level, percent | 11.79% | 12.38%
Tier 1 risk-based capital, requirement to be well capitalized, amount | $ 398,008 | $ 364,141
Tier 1 risk-based capital, requirement to be well capitalized, percent | 8.00% | 8.00%
Tier 1 risk-based capital, excess, amount | $ 188,574 | $ 199,285
Tier 1 risk-based capital, excess, percent | 3.79% | 4.38%
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 682,527 | $ 658,777
Total risk-based capital, capital level, percent | 13.72% | 14.47%
Total risk-based capital, requirement to be well capitalized, amount | $ 497,511 | $ 455,177
Total risk-based capital, requirement to be well capitalized, percent | 10.00% | 10.00%
Total risk-based capital, excess, amount | $ 185,016 | $ 203,600
Total risk-based capital, excess, percent | 3.72% | 4.47%

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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://fasb.org/us-gaap/role/ref/legacyRef -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 Total Capital exceeds the minimum required for capital adequacy purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 Risk Based Capital as defined in the regulations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 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://fasb.org/us-gaap/role/ref/legacyRef -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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