Note 14 - Regulatory Capital (Details) - Summary of the Bank's Compliance (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014
Savings Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier I (leverage) capital, capital level, amount	$ 459,988
Tier I (leverage) capital, capital level, percent of assets	9.54%
Tier I (leverage) capital, requirement to be well capitalized, amount	240,978
Tier I (leverage) capital, requirement to be well capitalized, percent of assets	5.00%
Tier I (leverage) capital, excess, amount	219,010
Tier I (leverage) capital, excess, percent of assets	4.54%
Tier I risk-based capital, capital level, amount	459,988
Tier I risk-based capital, capital level, percent of assets	14.13%
Tier I risk-based capital, requirement to be well capitalized, amount	195,385
Tier I risk-based capital, requirement to be well capitalized, percent of assets	6.00%
Tier I risk-based capital, excess, amount	264,603
Tier I risk-based capital, excess, percent of assets	8.13%
Total risk-based capital, capital level, amount	489,222
Total risk-based capital, capital level, percent of assets	15.02%
Total risk-based capital, requirement to be well capitalized, amount	325,641
Total risk-based capital, requirement to be well capitalized, percent of assets	10.00%
Total risk-based capital, excess, amount	163,581
Total risk-based capital, excess, percent of assets	5.02%
Holding Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier I (leverage) capital, capital level, amount	472,547
Tier I (leverage) capital, capital level, percent of assets	9.82%
Tier I (leverage) capital, requirement to be well capitalized, amount	240,689
Tier I (leverage) capital, requirement to be well capitalized, percent of assets	5.00%
Tier I (leverage) capital, excess, amount	231,858
Tier I (leverage) capital, excess, percent of assets	4.82%
Tier I risk-based capital, capital level, amount	472,547
Tier I risk-based capital, capital level, percent of assets	14.54%
Tier I risk-based capital, requirement to be well capitalized, amount	195,018
Tier I risk-based capital, requirement to be well capitalized, percent of assets	6.00%
Tier I risk-based capital, excess, amount	277,529
Tier I risk-based capital, excess, percent of assets	8.54%
Total risk-based capital, capital level, amount	501,782
Total risk-based capital, capital level, percent of assets	15.44%
Total risk-based capital, requirement to be well capitalized, amount	325,031
Total risk-based capital, requirement to be well capitalized, percent of assets	10.00%
Total risk-based capital, excess, amount	$ 176,751
Total risk-based capital, excess, percent of assets	5.44%