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Note 4 - Debt and Equity Securities - Securities Available-for-sale and Held-to-maturity by Contractual Maturity (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Securities held-to-maturity, amortized cost, due in one year or less $ 1,398,000  
Securities held-to-maturity, fair value, due in one year or less 1,398,000  
Securities held-to-maturity, amortized cost, due after ten years 21,869,000  
Securities held-to-maturity, fair value, due after ten years 19,949,000  
Securities held-to-maturity 31,235,000 $ 30,886,000
Securities held-to-maturity, fair value 28,911,000 29,699,000
Securities available for sale, amortized cost, due in one year or less 0  
Securities available for sale, fair value, due in one year or less 0  
Securities available for sale, amortized cost, due after one year through five years 4,277,000  
Securities available for sale, fair value, due after one year through five years 4,299,000  
Securities available for sale, amortized cost, due after five years through ten years 125,670,000  
Securities available for sale, fair value, due after five years through ten years 117,351,000  
Securities available for sale, amortized cost, due after ten years 82,344,000  
Securities available for sale, fair value, due after ten years 83,379,000  
Securities available for sale, amortized cost, total other securities 748,952,000 748,350,000
Mortgage-backed securities (including assets pledged of $245,531 and $148,505 at March 31, 2018 and December 31, 2017, respectively; $1,505 and $1,590 at fair value pursuant to the fair value option at March 31, 2018 and December 31, 2017, respectively) 729,261,000 738,354,000
Securities available for sale, fair value 729,261,000 738,354,000
Other Debt Obligations [Member]    
Securities held-to-maturity 23,267,000 22,913,000
Securities held-to-maturity, fair value 21,347,000 21,889,000
Mortgage-backed securities (including assets pledged of $245,531 and $148,505 at March 31, 2018 and December 31, 2017, respectively; $1,505 and $1,590 at fair value pursuant to the fair value option at March 31, 2018 and December 31, 2017, respectively) 216,480,000 228,704,000
Securities available for sale, fair value 216,480,000 228,704,000
Collateralized Mortgage Backed Securities [Member]    
Securities held-to-maturity 7,968,000 7,973,000
Securities held-to-maturity, fair value 7,564,000 7,810,000
Securities available for sale, amortized cost, total other securities 525,210,000 513,985,000
Mortgage-backed securities (including assets pledged of $245,531 and $148,505 at March 31, 2018 and December 31, 2017, respectively; $1,505 and $1,590 at fair value pursuant to the fair value option at March 31, 2018 and December 31, 2017, respectively) 512,781,000 509,650,000
Securities available for sale, fair value 512,781,000 509,650,000
Total Other Securities [Member]    
Securities available for sale, amortized cost, total other securities 212,291,000  
Mortgage-backed securities (including assets pledged of $245,531 and $148,505 at March 31, 2018 and December 31, 2017, respectively; $1,505 and $1,590 at fair value pursuant to the fair value option at March 31, 2018 and December 31, 2017, respectively) 205,029,000  
Securities available for sale, fair value 205,029,000  
Mutual Fund Debt Securities [Member]    
Securities available for sale, amortized cost, total other securities 11,451,000 11,575,000
Mortgage-backed securities (including assets pledged of $245,531 and $148,505 at March 31, 2018 and December 31, 2017, respectively; $1,505 and $1,590 at fair value pursuant to the fair value option at March 31, 2018 and December 31, 2017, respectively) 11,451,000 11,575,000
Securities available for sale, fair value $ 11,451,000 $ 11,575,000