Note 3 - Debt Securities (Tables)
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12 Months Ended |
Dec. 31, 2017 |
Notes Tables |
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Unrealized Gain (Loss) on Investments [Table Text Block] |
| | | | Gross | | Gross | | | | | | | | | | | | | | | | | | | | | December 31, 2017 | | | Securities Available for Sale | | | | | | | | | | | | | | | | | U.S. Treasury and government sponsored agencies | | $ | 55,567 | | | $ | 38 | | | $ | (249 | ) | | $ | 55,356 | | Mortgage-backed securities | | | 278,177 | | | | 1,006 | | | | (2,685 | ) | | | 276,498 | | State and municipal securities | | | 134,641 | | | | 761 | | | | (553 | ) | | | 134,849 | | Corporate debt | | | 69,996 | | | | 1,416 | | | | (35 | ) | | | 71,377 | | Total | | $ | 538,381 | | | $ | 3,221 | | | $ | (3,522 | ) | | $ | 538,080 | | Securities Held to Maturity | | | | | | | | | | | | | | | | | State and municipal securities | | | 250 | | | | - | | | | - | | | | 250 | | Total | | $ | 250 | | | $ | - | | | $ | - | | | $ | 250 | | | | | | | | | | | | | | | | | | | December 31, 2016 | | | | | | | | | | | | | | | | | Securities Available for Sale | | | | | | | | | | | | | | | | | U.S. Treasury and government sponsored agencies | | $ | 45,998 | | | $ | 382 | | | $ | (126 | ) | | $ | 46,254 | | Mortgage-backed securities | | | 228,843 | | | | 1,515 | | | | (3,168 | ) | | | 227,190 | | State and municipal securities | | | 139,504 | | | | 1,120 | | | | (694 | ) | | | 139,930 | | Corporate debt | | | 8,985 | | | | 16 | | | | - | | | | 9,001 | | Total | | $ | 423,330 | | | $ | 3,033 | | | $ | (3,988 | ) | | $ | 422,375 | | Securities Held to Maturity | | | | | | | | | | | | | | | | | Mortgage-backed securities | | | 19,164 | | | | 321 | | | | (245 | ) | | | 19,240 | | State and municipal securities | | | 5,888 | | | | 315 | | | | (12 | ) | | | 6,191 | | Corporate debt | | | 37,512 | | | | 374 | | | | (15 | ) | | | 37,871 | | Total | | $ | 62,564 | | | $ | 1,010 | | | $ | (272 | ) | | $ | 63,302 | |
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Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
| | December 31, 2017 | | December 31, 2016 | | | Amortized Cost | | Market Value | | Amortized Cost | | Market Value | | | (In Thousands) | Debt securities available for sale | | | | | | | | | | | | | | | | | Due within one year | | $ | 22,122 | | | $ | 22,172 | | | $ | 28,270 | | | $ | 28,400 | | Due from one to five years | | | 160,773 | | | | 160,563 | | | | 152,347 | | | | 153,003 | | Due from five to ten years | | | 73,362 | | | | 74,684 | | | | 13,870 | | | | 13,782 | | Due after ten years | | | 3,947 | | | | 4,163 | | | | - | | | | - | | Mortgage-backed securities | | | 278,177 | | | | 276,498 | | | | 228,843 | | | | 227,190 | | | | $ | 538,381 | | | $ | 538,080 | | | $ | 423,330 | | | $ | 422,375 | | | | | | | | | | | | | | | | | | | Debt securities held to maturity | | | | | | | | | | | | | | | | | Due from one to five years | | $ | 250 | | | $ | 250 | | | $ | 250 | | | $ | 250 | | Due from five to ten years | | | - | | | | - | | | | 34,251 | | | | 34,617 | | Due after ten years | | | - | | | | - | | | | 8,899 | | | | 9,195 | | Mortgage-backed securities | | | - | | | | - | | | | 19,164 | | | | 19,240 | | | | $ | 250 | | | $ | 250 | | | $ | 62,564 | | | $ | 63,302 | |
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Gain (Loss) on Investments [Table Text Block] |
| | Less Than Twelve Months | | Twelve Months or More | | Total | | | Gross | | | | Gross | | | | Gross | | | | | Unrealized | | | | Unrealized | | | | Unrealized | | | | | Losses | | Fair Value | | Losses | | Fair Value | | Losses | | Fair Value | | | (In Thousands) | December 31, 2017 | | | | | | | | | | | | | U.S. Treasury and government sponsored agencies | | $ | (151 | ) | | $ | 33,401 | | | $ | (98 | ) | | $ | 2,926 | | | $ | (249 | ) | | $ | 36,327 | | Mortgage-backed securities | | | (986 | ) | | | 140,432 | | | | (1,699 | ) | | | 75,903 | | | | (2,685 | ) | | | 216,335 | | State and municipal securities | | | (450 | ) | | | 66,637 | | | | (103 | ) | | | 6,648 | | | | (553 | ) | | | 73,285 | | Corporate debt | | | (35 | ) | | | 6,955 | | | | - | | | | - | | | | (35 | ) | | | 6,955 | | Total | | $ | (1,622 | ) | | $ | 247,425 | | | $ | (1,900 | ) | | $ | 85,477 | | | $ | (3,522 | ) | | $ | 332,902 | | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2016 | | | | | | | | | | | | | | | | | | | | | | | | | U.S. Treasury and government sponsored agencies | | $ | (126 | ) | | $ | 10,865 | | | $ | - | | | $ | - | | | $ | (126 | ) | | $ | 10,865 | | Mortgage-backed securities | | | (3,413 | ) | | | 174,225 | | | | - | | | | - | | | | (3,413 | ) | | | 174,225 | | State and municipal securities | | | (698 | ) | | | 64,502 | | | | (8 | ) | | | 1,021 | | | | (706 | ) | | | 65,523 | | Corporate debt | | | (15 | ) | | | 3,034 | | | | - | | | | - | | | | (15 | ) | | | 3,034 | | Total | | $ | (4,252 | ) | | $ | 252,626 | | | $ | (8 | ) | | $ | 1,021 | | | $ | (4,260 | ) | | $ | 253,647 | |
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Available-for-sale Securities [Table Text Block] |
| | Years Ended December 31, | | | 2017 | | 2016 | | 2015 | | | (In Thousands) | Sale proceeds | | $ | - | | | $ | 6,085 | | | $ | 16,738 | | Gross realized gains | | $ | - | | | $ | 4 | | | $ | 29 | | Gross realized losses | | | - | | | | (7 | ) | | | - | | Net realized gain (loss) | | $ | - | | | $ | (3 | ) | | $ | 29 | |
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