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Derivative Financial Instruments - Fair Value of Derivative Financial Instruments (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Derivatives, Fair Value [Line Items] |  |
Total Asset Derivatives | $ 12,089 | $ 177
Total Liability Derivatives | 16,389 | 1,802
Derivatives Designated as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total Asset Derivatives | 11,622 | 42
Total Liability Derivatives | 16,389 | 1,802
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts One [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total Liability Derivatives |  | 42
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts One [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total Asset Derivatives | 11,622 |
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts Two [Member] | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total Liability Derivatives | 16,389 | 1,760
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts Two [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total Asset Derivatives |  | 42
Derivatives Not Designated as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total Asset Derivatives | 467 | 135
Derivatives Not Designated as Hedging Instruments [Member] | Mortgage Loan Contracts [Member] | Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total Asset Derivatives | $ 467 | $ 135

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