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Note 14 - Regulatory Capital - Summary of the Bank's Compliance (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
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%