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Note 3 - Investment Securities (Details) - Securities with Unrealized Losses
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
Held-to-Maturity  
Held-to-maturity, less than 12 months, estimated fair value $ 233,990
Held-to-maturity, less than 12 months, gross unrealized losses (890)
Held-to-maturity, 12 months or more, estimated fair value 2,759
Held-to-maturity, 12 months or more, gross unrealized losses (18)
Held-to-maturity, total, estimated fair value 236,749
Held-to-maturity, total, gross unrealized losses (908)
Available-for-Sale  
Available-for-sale, less than 12 months, estimated fair value 180,955
Available-for-sale, less than 12 months, gross unrealized losses (1,309)
Available-for-sale, 12 months or more, estimated fair value 0
Available-for-sale, 12 months or more, gross unrealized losses 0
Available-for-sale, estimated fair value 180,955
Available-for-sale, gross unrealized losses (1,309)
US Government Agencies Debt Securities [Member]  
Held-to-Maturity  
Held-to-maturity, less than 12 months, estimated fair value 184,082
Held-to-maturity, less than 12 months, gross unrealized losses (393)
Held-to-maturity, 12 months or more, estimated fair value 0
Held-to-maturity, 12 months or more, gross unrealized losses 0
Held-to-maturity, total, estimated fair value 184,082
Held-to-maturity, total, gross unrealized losses (393)
Available-for-Sale  
Available-for-sale, less than 12 months, estimated fair value 97,763
Available-for-sale, less than 12 months, gross unrealized losses (259)
Available-for-sale, 12 months or more, estimated fair value 0
Available-for-sale, 12 months or more, gross unrealized losses 0
Available-for-sale, estimated fair value 97,763
Available-for-sale, gross unrealized losses (259)
Collateralized Mortgage Backed Securities [Member]  
Held-to-Maturity  
Held-to-maturity, less than 12 months, estimated fair value 11,281
Held-to-maturity, less than 12 months, gross unrealized losses (88)
Held-to-maturity, 12 months or more, estimated fair value 0
Held-to-maturity, 12 months or more, gross unrealized losses 0
Held-to-maturity, total, estimated fair value 11,281
Held-to-maturity, total, gross unrealized losses (88)
Available-for-Sale  
Available-for-sale, less than 12 months, estimated fair value 81,619
Available-for-sale, less than 12 months, gross unrealized losses (259)
Available-for-sale, 12 months or more, estimated fair value 0
Available-for-sale, 12 months or more, gross unrealized losses 0
Available-for-sale, estimated fair value 81,619
Available-for-sale, gross unrealized losses (259)
US States and Political Subdivisions Debt Securities [Member]  
Held-to-Maturity  
Held-to-maturity, less than 12 months, estimated fair value 38,627
Held-to-maturity, less than 12 months, gross unrealized losses (409)
Held-to-maturity, 12 months or more, estimated fair value 2,759
Held-to-maturity, 12 months or more, gross unrealized losses (18)
Held-to-maturity, total, estimated fair value 41,386
Held-to-maturity, total, gross unrealized losses (427)
Available-for-Sale  
Available-for-sale, less than 12 months, estimated fair value 0
Available-for-sale, less than 12 months, gross unrealized losses 0
Available-for-sale, 12 months or more, estimated fair value 0
Available-for-sale, 12 months or more, gross unrealized losses 0
Available-for-sale, estimated fair value 0
Available-for-sale, gross unrealized losses 0
Other Securities [Member]  
Available-for-Sale  
Available-for-sale, less than 12 months, estimated fair value 1,573
Available-for-sale, less than 12 months, gross unrealized losses (791)
Available-for-sale, 12 months or more, estimated fair value 0
Available-for-sale, 12 months or more, gross unrealized losses 0
Available-for-sale, estimated fair value 1,573
Available-for-sale, gross unrealized losses $ (791)