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Note 4 - Debt and Equity Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Securities held-to-maturity, gross unrealized losses $ 1,841 $ 2,327
Securities held-to-maturity, amortized cost 32,434 37,735
Securities held-to-maturity, fair value 30,593 35,408
Securities held-to-maturity, gross unrealized gains 0 0
Securities available for sale, fair value 837,705 861,381
Securities available for sale, gross unrealized gains 6,417 5,091
Securities available for sale, gross unrealized losses 10,048 11,719
Securities available for sale, amortized cost 841,336 868,009
Corporate Debt Securities [Member]    
Securities available for sale, fair value 103,191 102,910
Securities available for sale, gross unrealized gains 0
Securities available for sale, gross unrealized losses 6,809 7,090
Securities available for sale, amortized cost 110,000 110,000
Municipal Debt Securities [Member]    
Securities held-to-maturity, gross unrealized losses 1,674 2,327
Securities held-to-maturity, amortized cost 24,451 37,735
Securities held-to-maturity, fair value 22,777 35,408
Securities held-to-maturity, gross unrealized gains 0 0
Securities available for sale, fair value 126,596 126,903
Securities available for sale, gross unrealized gains 2,990 1,983
Securities available for sale, gross unrealized losses 0 64
Securities available for sale, amortized cost 123,606 124,984
Other Debt Obligations [Member]    
Securities held-to-maturity, gross unrealized losses 1,674  
Securities held-to-maturity, amortized cost 24,451 37,735
Securities held-to-maturity, fair value 22,777 35,408
Securities held-to-maturity, gross unrealized gains  
Securities available for sale, fair value 317,693 344,905
Mutual Fund Debt Securities [Member]    
Securities available for sale, fair value 21,563 21,366
Securities available for sale, gross unrealized gains 0 0
Securities available for sale, gross unrealized losses 0 0
Securities available for sale, amortized cost 21,563 21,366
FNMA [Member]    
Securities held-to-maturity, gross unrealized losses 167  
Securities held-to-maturity, amortized cost 7,983  
Securities held-to-maturity, fair value 7,816  
Securities held-to-maturity, gross unrealized gains  
Securities available for sale, fair value 104,736 108,351
Securities available for sale, gross unrealized gains 540 463
Securities available for sale, gross unrealized losses 815 1,605
Securities available for sale, amortized cost 105,011 109,493
Collateralized Debt Obligations [Member]    
Securities available for sale, fair value 58,899 86,365
Securities available for sale, gross unrealized gains 520 895
Securities available for sale, gross unrealized losses 0
Securities available for sale, amortized cost 58,379 85,470
Collateralized Mortgage Backed Securities [Member]    
Securities held-to-maturity, gross unrealized losses 167  
Securities held-to-maturity, amortized cost 7,983
Securities held-to-maturity, fair value 7,816
Securities held-to-maturity, gross unrealized gains  
Securities available for sale, fair value 520,012 516,476
Securities available for sale, gross unrealized gains 2,907 2,213
Securities available for sale, gross unrealized losses 3,239 4,563
Securities available for sale, amortized cost 520,344 518,826
Other Securities [Member]    
Securities available for sale, fair value 7,444 7,361
Securities available for sale, gross unrealized gains 0 0
Securities available for sale, gross unrealized losses 2
Securities available for sale, amortized cost 7,444 7,363
Available for Sale Securities Excluding Mortgage Backed Securities [Member]    
Securities available for sale, fair value 317,693 344,905
Securities available for sale, gross unrealized gains 3,510 2,878
Securities available for sale, gross unrealized losses 6,809 7,156
Securities available for sale, amortized cost 320,992 349,183
REMIC and CMO [Member]    
Securities available for sale, fair value 408,926 401,370
Securities available for sale, gross unrealized gains 2,248 1,607
Securities available for sale, gross unrealized losses 2,371 2,873
Securities available for sale, amortized cost 409,049 402,636
GNMA [Member]    
Securities available for sale, fair value 1,248 1,427
Securities available for sale, gross unrealized gains 95 108
Securities available for sale, gross unrealized losses 0
Securities available for sale, amortized cost 1,153 1,319
FHLMC [Member]    
Securities available for sale, fair value 5,102 5,328
Securities available for sale, gross unrealized gains 24 35
Securities available for sale, gross unrealized losses 53 85
Securities available for sale, amortized cost $ 5,131 $ 5,378