Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Loans - Summary of Loans (Details)

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Note 5 - Loans - Summary of Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Financing receivable, gross $ 6,129,649   $ 5,851,261      
Less allowance for loan losses (64,239) $ (62,050) (59,406) [1] $ (55,059) $ (53,892) $ (51,893)
Net Loans $ 6,065,410   $ 5,791,855 [1]      
Financing receivable, gross, percentage 100.00%   100.00%      
Commercial Real Estate Portfolio Segment [Member]            
Financing receivable, gross $ 2,345,879   $ 2,279,366      
Less allowance for loan losses $ (36,178) (35,787) $ (32,880) (29,127) (28,707) (28,872)
Financing receivable, gross, percentage 38.27%   38.96%      
Real Estate Portfolio Segment[Member]            
Financing receivable, gross $ 3,193,921   $ 2,928,808      
Financing receivable, gross, percentage 52.11%   50.05%      
Real Estate Portfolio Segment[Member] | Construction Loans [Member]            
Financing receivable, gross $ 522,788   $ 580,874      
Less allowance for loan losses $ (4,062) (4,138) $ (4,989) (5,138) (4,825) (5,125)
Financing receivable, gross, percentage 8.53%   9.93%      
Real Estate Portfolio Segment[Member] | Owner Occupied Commercial [Member]            
Financing receivable, gross $ 1,383,882   $ 1,328,666      
Financing receivable, gross, percentage 22.58%   22.71%      
Real Estate Portfolio Segment[Member] | One to Four Family [Member]            
Financing receivable, gross $ 584,133   $ 603,063      
Financing receivable, gross, percentage 9.53%   10.30%      
Real Estate Portfolio Segment[Member] | Other Mortgages [Member]            
Financing receivable, gross $ 1,225,906   $ 997,079      
Financing receivable, gross, percentage 20.00%   17.04%      
Consumer Portfolio Segment [Member]            
Financing receivable, gross $ 67,061   $ 62,213      
Less allowance for loan losses $ (561) $ (519) $ (515) $ (402) $ (398) $ (392)
Financing receivable, gross, percentage 1.09%   1.06%      
[1] derived from audited financial statements