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Securities - Securities with Unrealized Losses Aggregated by Investment Category and Length of Time that Individual Securities have been in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Less than 12 Months |  |
Fair Value | $ 9,143 | $ 98,395
Unrealized Loss | (25) | (766)
12 Months or More |  |
Fair Value | 196,945 | 210,530
Unrealized Loss | (3,836) | (6,561)
Fair Value | 206,088 | 309,925
Unrealized Loss | (3,861) | (7,327)
U.S. Gov’t sponsored entities |  |
Less than 12 Months |  |
Fair Value | 4,963 | 14,786
Unrealized Loss | (2) | (41)
12 Months or More |  |
Fair Value | 69,440 | 70,676
Unrealized Loss | (743) | (1,529)
Fair Value | 74,403 | 86,462
Unrealized Loss | (745) | (1,570)
State & political subdivisions |  |
Less than 12 Months |  |
Fair Value | 994 | 13,834
Unrealized Loss | (13) | (62)
12 Months or More |  |
Fair Value | 10,389 | 21,080
Unrealized Loss | (165) | (511)
Fair Value | 11,383 | 34,914
Unrealized Loss | (178) | (573)
Residential & multi-family mortgage |  |
Less than 12 Months |  |
Fair Value | 3,186 | 69,015
Unrealized Loss | (10) | (656)
12 Months or More |  |
Fair Value | 87,606 | 87,286
Unrealized Loss | (1,798) | (2,917)
Fair Value | 90,792 | 156,301
Unrealized Loss | (1,808) | (3,573)
Corporate notes & bonds |  |
Less than 12 Months |  |
Fair Value | 0 | 0
Unrealized Loss | 0 | 0
12 Months or More |  |
Fair Value | 9,528 | 9,759
Unrealized Loss | (476) | (601)
Fair Value | 9,528 | 9,759
Unrealized Loss | (476) | (601)
Pooled SBA |  |
Less than 12 Months |  |
Fair Value | 0 | 760
Unrealized Loss | 0 | (7)
12 Months or More |  |
Fair Value | 19,035 | 20,795
Unrealized Loss | (581) | (917)
Fair Value | 19,035 | 21,555
Unrealized Loss | (581) | (924)
Other |  |
Less than 12 Months |  |
Fair Value | 0 | 0
Unrealized Loss | 0 | 0
12 Months or More |  |
Fair Value | 947 | 934
Unrealized Loss | (73) | (86)
Fair Value | 947 | 934
Unrealized Loss | $ (73) | $ (86)

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- Definition Debt Securities, Available-for-sale, Unrealized Loss Position More Than 12 Months [Abstract] + References No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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