Note 4 - Securities (Tables)
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3 Months Ended |
Mar. 31, 2018 |
Notes Tables |
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Unrealized Gain (Loss) on Investments [Table Text Block] |
| | Amortized Cost | | Gross Unrealized Gain | | Gross Unrealized Loss | | Fair Value | March 31, 2018 | | | Available for sale debt securities | | | | | | | | | | | | | | | | | U.S. Treasury and government sponsored agencies | | $ | 58,025 | | | $ | 5 | | | $ | (777 | ) | | $ | 57,252 | | Mortgage-backed securities | | | 294,582 | | | | 609 | | | | (6,874 | ) | | | 288,318 | | State and municipal securities | | | 123,123 | | | | 522 | | | | (856 | ) | | | 122,789 | | Corporate debt | | | 91,409 | | | | 1,376 | | | | (509 | ) | | | 92,276 | | Total | | $ | 567,139 | | | $ | 2,512 | | | $ | (9,016 | ) | | $ | 560,635 | | Held to maturity debt securities | | | | | | | | | | | | | | | | | State and municipal securities | | $ | 250 | | | $ | - | | | $ | - | | | $ | 250 | | Total | | $ | 250 | | | $ | - | | | $ | - | | | $ | 250 | | | | | | | | | | | | | | | | | | | December 31, 2017 | | | | | | | | | | | | | | | | | Available for sale debt securities | | | | | | | | | | | | | | | | | 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 | | Held to maturity debt securities | | | | | | | | | | | | | | | | | State and municipal securities | | $ | 250 | | | $ | - | | | $ | - | | | $ | 250 | | Total | | $ | 250 | | | $ | - | | | $ | - | | | $ | 250 | |
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Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
| | March 31, 2018 | | December 31, 2017 | | | Amortized Cost | | Fair Value | | Amortized Cost | | Fair Value | | | (In thousands) | Available for sale debt securities | | | | | | | | | | | | | | | | | Due within one year | | $ | 45,864 | | | $ | 45,909 | | | $ | 22,122 | | | $ | 22,172 | | Due from one to five years | | | 194,445 | | | | 193,930 | | | | 160,773 | | | | 160,563 | | Due from five to ten years | | | 29,371 | | | | 29,472 | | | | 73,362 | | | | 74,684 | | Due after ten years | | | 2,877 | | | | 3,006 | | | | 3,947 | | | | 4,163 | | Mortgage-backed securities | | | 294,582 | | | | 288,318 | | | | 278,177 | | | | 276,498 | | | | $ | 567,139 | | | $ | 560,635 | | | $ | 538,381 | | | $ | 538,080 | | | | | | | | | | | | | | | | | | | Held to maturity debt securities | | | | | | | | | | | | | | | | | Due from one to five years | | $ | 250 | | | $ | 250 | | | $ | 250 | | | $ | 250 | | | | $ | 250 | | | $ | 250 | | | $ | 250 | | | $ | 250 | |
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Gain (Loss) on Securities [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) | March 31, 2018: | | | | | | | | | | | | | | | | | | | | | | | | | U.S. Treasury and government sponsored agencies | | $ | (635 | ) | | $ | 54,191 | | | $ | (142 | ) | | $ | 2,881 | | | $ | (777 | ) | | $ | 57,072 | | Mortgage-backed securities | | | (4,046 | ) | | | 200,071 | | | | (2,828 | ) | | | 71,042 | | | | (6,874 | ) | | | 271,113 | | State and municipal securities | | | (716 | ) | | | 64,676 | | | | (140 | ) | | | 6,642 | | | | (856 | ) | | | 71,318 | | Corporate debt | | | (509 | ) | | | 26,389 | | | | - | | | | - | | | | (509 | ) | | | 26,389 | | Total | | $ | (5,906 | ) | | $ | 345,327 | | | $ | (3,110 | ) | | $ | 80,565 | | | $ | (9,016 | ) | | $ | 425,892 | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 | |
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