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Note 14 - Regulatory Capital - Summary of the Bank's Compliance (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
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%