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Note 6 - Debt and Equity Securities (Details) - Amortized Cost and Fair Value of Securities Available For Sale - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Securites held-to-maturity:    
Amortized Cost $ 6,180,000 $ 0
Fair Value 6,180,000  
Amortized Cost 994,311,000 967,329,000
Fair Value 993,397,000 973,310,000
Gross Unrealized Gains 8,998,000 13,240,000
Gross Unrealized Losses 9,912,000 7,259,000
Municipal Debt Securities [Member]    
Securites held-to-maturity:    
Amortized Cost 6,180,000  
Fair Value 6,180,000  
Amortized Cost 127,696,000 145,864,000
Fair Value 131,583,000 148,896,000
Gross Unrealized Gains 3,887,000 3,093,000
Gross Unrealized Losses   61,000
Corporate Debt Securities [Member]    
Securites held-to-maturity:    
Amortized Cost 115,976,000 90,719,000
Fair Value 111,674,000 91,273,000
Gross Unrealized Gains 134,000 1,268,000
Gross Unrealized Losses 4,436,000 714,000
Mutual Fund Debt Securities [Member]    
Securites held-to-maturity:    
Amortized Cost 21,290,000 21,118,000
Fair Value 21,290,000 21,118,000
Collateralized Debt Obligations [Member]    
Securites held-to-maturity:    
Amortized Cost 53,225,000  
Fair Value 52,898,000  
Gross Unrealized Losses 327,000  
Other Debt Obligations [Member]    
Securites held-to-maturity:    
Amortized Cost 7,214,000 7,098,000
Fair Value 7,212,000 7,090,000
Gross Unrealized Losses 2,000 8,000
Available For Sale Securities, Excluding Mortgage-Backed Securities [Member]    
Securites held-to-maturity:    
Amortized Cost 325,401,000 264,799,000
Fair Value 324,657,000 268,377,000
Gross Unrealized Gains 4,021,000 4,361,000
Gross Unrealized Losses 4,765,000 783,000
REMIC and CMO [Member]    
Securites held-to-maturity:    
Amortized Cost 469,987,000 504,207,000
Fair Value 469,936,000 505,768,000
Gross Unrealized Gains 3,096,000 6,188,000
Gross Unrealized Losses 3,147,000 4,627,000
GNMA [Member]    
Securites held-to-maturity:    
Amortized Cost 11,635,000 13,862,000
Fair Value 11,798,000 14,159,000
Gross Unrealized Gains 302,000 421,000
Gross Unrealized Losses 139,000 124,000
FNMA [Member]    
Securites held-to-maturity:    
Amortized Cost 170,327,000 169,956,000
Fair Value 170,057,000 170,367,000
Gross Unrealized Gains 1,492,000 2,128,000
Gross Unrealized Losses 1,762,000 1,717,000
FHLMC [Member]    
Securites held-to-maturity:    
Amortized Cost 16,961,000 14,505,000
Fair Value 16,949,000 14,639,000
Gross Unrealized Gains 87,000 142,000
Gross Unrealized Losses 99,000 8,000
Commercial Mortgage Backed Securities [Member]    
Securites held-to-maturity:    
Amortized Cost 668,910,000 702,530,000
Fair Value 668,740,000 704,933,000
Gross Unrealized Gains 4,977,000 8,879,000
Gross Unrealized Losses $ 5,147,000 $ 6,476,000