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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
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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

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