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Derivatives and Hedging Activities - Summary of Effect of Derivative Instruments on Income Statement (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Derivatives, Fair Value [Line Items] |  |  |  |
Total gain (loss) on derivative financial instruments | $ (1,087) | $ (273) | $ (3,069) | $ 480
Interest Rate Swaps [Member] | Other Income [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Total gain (loss) on derivative financial instruments | (556) | (293) | (1,619) | (82)
Interest Rate Loan Commitments [Member] | Mortgage Banking Income [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Total gain (loss) on derivative financial instruments | (66) | (111) | (133) | 32
Forward TBA Contracts [Member] | Mortgage Banking Income [Member] |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Total gain (loss) on derivative financial instruments | $ (465) | $ 131 | $ (1,317) | $ 530

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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