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Securities - Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized cost |  |
Total debt securities | $ 498,814 | $ 521,337
Unrealized Gains (Losses) |  |
Accumulated gross unrealized gain, before tax | 5,655 | 2,853
Accumulated gross unrealized loss, before tax | (3,861) | (7,327)
Amortized Cost |  |
Securities available for sale | 500,608 | 516,863
U.S. Gov’t sponsored entities |  |
Amortized cost |  |
Total debt securities | 129,993 | 134,010
Unrealized Gains (Losses) |  |
Accumulated gross unrealized gain, before tax | 1,127 | 254
Accumulated gross unrealized loss, before tax | (745) | (1,570)
Amortized Cost |  |
Securities available for sale | 130,375 | 132,694
State & political subdivisions |  |
Amortized cost |  |
Total debt securities | 118,673 | 134,662
Unrealized Gains (Losses) |  |
Accumulated gross unrealized gain, before tax | 2,595 | 1,942
Accumulated gross unrealized loss, before tax | (178) | (573)
Amortized Cost |  |
Securities available for sale | 121,090 | 136,031
Residential & multi-family mortgage |  |
Amortized cost |  |
Total debt securities | 207,588 | 209,126
Unrealized Gains (Losses) |  |
Accumulated gross unrealized gain, before tax | 1,711 | 500
Accumulated gross unrealized loss, before tax | (1,808) | (3,573)
Amortized Cost |  |
Securities available for sale | 207,491 | 206,053
Corporate notes & bonds |  |
Amortized cost |  |
Total debt securities | 12,354 | 12,356
Unrealized Gains (Losses) |  |
Accumulated gross unrealized gain, before tax | 26 | 22
Accumulated gross unrealized loss, before tax | (476) | (601)
Amortized Cost |  |
Securities available for sale | 11,904 | 11,777
Pooled SBA |  |
Amortized cost |  |
Total debt securities | 29,186 | 30,163
Unrealized Gains (Losses) |  |
Accumulated gross unrealized gain, before tax | 196 | 135
Accumulated gross unrealized loss, before tax | (581) | (924)
Amortized Cost |  |
Securities available for sale | 28,801 | 29,374
Other |  |
Amortized cost |  |
Total debt securities | 1,020 | 1,020
Unrealized Gains (Losses) |  |
Accumulated gross unrealized gain, before tax | 0 | 0
Accumulated gross unrealized loss, before tax | (73) | (86)
Amortized Cost |  |
Securities available for sale | $ 947 | $ 934

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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