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Derivatives and Hedging Activities - Summary of Fair Values of Derivative Instruments on Balance Sheets (Detail) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Notional or Contractual Amount | $ 315,700,000 | $ 229,800,000
Asset Derivatives | 18,880,000 | 4,775,000
Liability Derivatives | 20,729,000 | 5,315,000
Interest Rate Swaps [Member] | Loan Swaps [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional or Contractual Amount | 315,657,000 | 229,778,000
Asset Derivatives | 18,672,000 | 4,650,000
Liability Derivatives | 20,721,000 | 5,081,000
Interest Rate Loan Commitments [Member] | Other Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional or Contractual Amount | 45,727,000 | 16,113,000
Asset Derivatives |  | 125,000
Liability Derivatives | 8,000 |
Forward TBA Contracts [Member] | Other Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Notional or Contractual Amount | 73,000,000 | 20,000,000
Asset Derivatives | $ 208,000 |
Liability Derivatives |  | $ 234,000

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