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Securities - Securities Available for Sale (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | $ 521,337 | $ 409,110
Unrealized gains | 2,853 | 4,798
Unrealized losses | (7,327) | (4,199)
Fair value | 516,863 | 409,709
U.S. Gov’t sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 134,010 | 108,578
Unrealized gains | 254 | 478
Unrealized losses | (1,570) | (908)
Fair value | 132,694 | 108,148
State & political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 134,662 | 134,428
Unrealized gains | 1,942 | 3,609
Unrealized losses | (573) | (314)
Fair value | 136,031 | 137,723
Residential & multi-family mortgage |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 209,126 | 111,214
Unrealized gains | 500 | 304
Unrealized losses | (3,573) | (1,882)
Fair value | 206,053 | 109,636
Corporate notes & bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 12,356 | 17,610
Unrealized gains | 22 | 52
Unrealized losses | (601) | (462)
Fair value | 11,777 | 17,200
Pooled SBA |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 30,163 | 36,260
Unrealized gains | 135 | 355
Unrealized losses | (924) | (575)
Fair value | 29,374 | 36,040
Other |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 1,020 | 1,020
Unrealized gains | 0 | 0
Unrealized losses | (86) | (58)
Fair value | $ 934 | $ 962

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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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- Definition Amount, before tax, of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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