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Note 14 - Regulatory Capital - Summary of the Bank's Compliance (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Savings Bank [Member]    
Tier I (leverage) capital:    
Tier i (leverage) capital, capital level, amount $ 644,880 $ 631,285
Tier i (leverage) capital, capital level, percent 9.90% 10.11%
Tier i (leverage) capital, requirement to be well capitalized, amount $ 325,697 $ 312,343
Tier i (leverage) capital, requirement to be well capitalized, percent 5.00% 5.00%
Tier i (leverage) capital, excess, amount $ 319,183 $ 318,942
Tier i (leverage) capital, excess, percent 4.90% 5.11%
Common Equity Tier I risk-based capital:    
Common equity tier i risk-based capital, capital level, amount $ 644,880 $ 631,285
Common equity tier i risk-based capital, capital level, percent 13.37% 13.87%
Common equity tier i risk-based capital, requirement to be well capitalized, amount $ 313,524 $ 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 $ 331,356 $ 335,348
Common equity tier i risk-based capital, excess, percent 6.87% 7.37%
Tier 1 risk-based capital, capital level, amount $ 644,880 $ 631,285
Tier 1 risk-based capital, capital level, percent 13.37% 13.87%
Tier 1 risk-based capital, requirement to be well capitalized, amount $ 385,876 $ 364,230
Tier 1 risk-based capital, requirement to be well capitalized, percent 8.00% 8.00%
Tier 1 risk-based capital, excess, amount $ 259,004 $ 267,055
Tier 1 risk-based capital, excess, percent 5.37% 5.87%
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 665,100 $ 651,636
Total risk-based capital, capital level, percent 13.79% 14.31%
Total risk-based capital, requirement to be well capitalized, amount $ 482,345 $ 455,288
Total risk-based capital, requirement to be well capitalized, percent 10.00% 10.00%
Total risk-based capital, excess, amount $ 182,755 $ 196,348
Total risk-based capital, excess, percent 3.79% 4.31%
Holding Company [Member]    
Tier I (leverage) capital:    
Tier i (leverage) capital, capital level, amount $ 572,189 $ 563,426
Tier i (leverage) capital, capital level, percent 8.79% 9.02%
Tier i (leverage) capital, requirement to be well capitalized, amount $ 325,615 $ 312,278
Tier i (leverage) capital, requirement to be well capitalized, percent 5.00% 5.00%
Tier i (leverage) capital, excess, amount $ 246,574 $ 251,148
Tier i (leverage) capital, excess, percent 3.79% 4.02%
Common Equity Tier I risk-based capital:    
Common equity tier i risk-based capital, capital level, amount $ 534,036 $ 527,727
Common equity tier i risk-based capital, capital level, percent 11.07% 11.59%
Common equity tier i risk-based capital, requirement to be well capitalized, amount $ 313,460 $ 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 $ 220,576 $ 231,862
Common equity tier i risk-based capital, excess, percent 4.57% 5.09%
Tier 1 risk-based capital, capital level, amount $ 572,189 $ 563,426
Tier 1 risk-based capital, capital level, percent 11.87% 12.38%
Tier 1 risk-based capital, requirement to be well capitalized, amount $ 385,797 $ 364,141
Tier 1 risk-based capital, requirement to be well capitalized, percent 8.00% 8.00%
Tier 1 risk-based capital, excess, amount $ 186,392 $ 199,285
Tier 1 risk-based capital, excess, percent 3.87% 4.38%
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 667,409 $ 658,777
Total risk-based capital, capital level, percent 13.84% 14.47%
Total risk-based capital, requirement to be well capitalized, amount $ 482,246 $ 455,177
Total risk-based capital, requirement to be well capitalized, percent 10.00% 10.00%
Total risk-based capital, excess, amount $ 185,163 $ 203,600
Total risk-based capital, excess, percent 3.84% 4.47%