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Note 3 - Investment Securities - Securities With Unrealized Losses (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2017 USD ($)
Held-to-maturity, less than 12 months, estimated fair value | $ 28,341
Held-to-maturity, less than 12 months, gross unrealized losses | (136)
Held-to-maturity, 12 months or more, estimated fair value | 49,234
Held-to-maturity, 12 months or more, gross unrealized losses | (250)
Held-to-maturity, total, estimated fair value | 77,575
Held-to-maturity, total, gross unrealized losses | (386)
Available-for-sale, less than 12 months, estimated fair value | 694,627
Available-for-sale, less than 12 months, gross unrealized losses | (8,240)
Available-for-sale, 12 months or more, estimated fair value | 432,975
Available-for-sale, 12 months or more, gross unrealized losses | (10,094)
Available-for-sale, total, estimated fair value | 1,127,602
Available-for-sale, total, gross unrealized losses | (18,334)
US Government Agencies Debt Securities [Member] |
Held-to-maturity, less than 12 months, estimated fair value | 12,947
Held-to-maturity, less than 12 months, gross unrealized losses | (53)
Held-to-maturity, 12 months or more, estimated fair value | 39,913
Held-to-maturity, 12 months or more, gross unrealized losses | (87)
Held-to-maturity, total, estimated fair value | 52,860
Held-to-maturity, total, gross unrealized losses | (140)
Available-for-sale, less than 12 months, estimated fair value | 66,254
Available-for-sale, less than 12 months, gross unrealized losses | (750)
Available-for-sale, 12 months or more, estimated fair value | 82,211
Available-for-sale, 12 months or more, gross unrealized losses | (1,307)
Available-for-sale, total, estimated fair value | 148,465
Available-for-sale, total, gross unrealized losses | (2,057)
Collateralized Mortgage Backed Securities [Member] |
Held-to-maturity, less than 12 months, estimated fair value | 4,094
Held-to-maturity, less than 12 months, gross unrealized losses | (42)
Held-to-maturity, 12 months or more, estimated fair value | 6,687
Held-to-maturity, 12 months or more, gross unrealized losses | (149)
Held-to-maturity, total, estimated fair value | 10,781
Held-to-maturity, total, gross unrealized losses | (191)
Available-for-sale, less than 12 months, estimated fair value | 626,560
Available-for-sale, less than 12 months, gross unrealized losses | (7,458)
Available-for-sale, 12 months or more, estimated fair value | 273,883
Available-for-sale, 12 months or more, gross unrealized losses | (6,075)
Available-for-sale, total, estimated fair value | 900,443
Available-for-sale, total, gross unrealized losses | (13,533)
US States and Political Subdivisions Debt Securities [Member] |
Held-to-maturity, less than 12 months, estimated fair value | 11,300
Held-to-maturity, less than 12 months, gross unrealized losses | (41)
Held-to-maturity, 12 months or more, estimated fair value | 2,634
Held-to-maturity, 12 months or more, gross unrealized losses | (14)
Held-to-maturity, total, estimated fair value | 13,934
Held-to-maturity, total, gross unrealized losses | (55)
Available-for-sale, less than 12 months, estimated fair value | 1,813
Available-for-sale, less than 12 months, gross unrealized losses | (32)
Available-for-sale, 12 months or more, estimated fair value | 76,781
Available-for-sale, 12 months or more, gross unrealized losses | (2,712)
Available-for-sale, total, estimated fair value | 78,594
Available-for-sale, total, gross unrealized losses | (2,744)
Other Securities [Member] |
Available-for-sale, less than 12 months, estimated fair value |
Available-for-sale, less than 12 months, gross unrealized losses |
Available-for-sale, 12 months or more, estimated fair value | 100
Available-for-sale, 12 months or more, gross unrealized losses |
Available-for-sale, total, estimated fair value | 100
Available-for-sale, total, gross unrealized losses |

X
- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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