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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 | Jun. 30, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | $ 8,178 | $ 152,344
Less than 12 Months, Unrealized Loss | (275) | (2,466)
12 Months or More, Fair Value | 99,258 | 121,004
12 Months or More, Unrealized Loss | (2,305) | (4,516)
Total, Fair Value | 107,436 | 273,348
Total, Unrealized Loss | (2,580) | (6,982)
U.S. Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 0 | 65,675
Less than 12 Months, Unrealized Loss | 0 | (640)
12 Months or More, Fair Value | 6,398 | 31,923
12 Months or More, Unrealized Loss | (4) | (488)
Total, Fair Value | 6,398 | 97,598
Total, Unrealized Loss | (4) | (1,128)
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 271 | 9,103
Less than 12 Months, Unrealized Loss | (194) | (234)
12 Months or More, Fair Value | 0 | 2,478
12 Months or More, Unrealized Loss | 0 | (9)
Total, Fair Value | 271 | 11,581
Total, Unrealized Loss | (194) | (243)
Residential and Multi-Family Mortgage [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 7,907 | 69,631
Less than 12 Months, Unrealized Loss | (81) | (1,562)
12 Months or More, Fair Value | 58,084 | 50,351
12 Months or More, Unrealized Loss | (635) | (1,832)
Total, Fair Value | 65,991 | 119,982
Total, Unrealized Loss | (716) | (3,394)
Corporate Notes and Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 0 | 5,027
Less than 12 Months, Unrealized Loss | 0 | (2)
12 Months or More, Fair Value | 7,940 | 8,144
12 Months or More, Unrealized Loss | (1,463) | (1,269)
Total, Fair Value | 7,940 | 13,171
Total, Unrealized Loss | (1,463) | (1,271)
Pooled SBA [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 0 | 2,908
Less than 12 Months, Unrealized Loss | 0 | (28)
12 Months or More, Fair Value | 25,840 | 27,127
12 Months or More, Unrealized Loss | (179) | (879)
Total, Fair Value | 25,840 | 30,035
Total, Unrealized Loss | (179) | (907)
Other Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 0 | 0
Less than 12 Months, Unrealized Loss | 0 | 0
12 Months or More, Fair Value | 996 | 981
12 Months or More, Unrealized Loss | (24) | (39)
Total, Fair Value | 996 | 981
Total, Unrealized Loss | $ (24) | $ (39)

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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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